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Fluke 2620A Power Supply User Manual

1. Self Test Diagnostics and Error Codes esee Pertormance iii ch rie etae Accuracy Verification l est Licence ete Channel Integrity Test uu essere ener eene nennen nenne Thermocouple Measurement Range Accuracy Test 4 Terminal Resistance Test esee ener Thermocouple Temperature Accuracy Open Thermocouple Response Test eese RTD Temperature Accuracy Test eese enne RTD Temperature Accuracy Test Using Decade Resistance Source RTD Temperature Accuracy Test Using DIN IEC 751 Digital Input Output Verification Tests eee Digital Output Test euer ertet bre celo ae Dd Digital Input Test rebate ei a aie cocti dli Totalizer Sensitivity Test nennen Dedicated Alarm Output Test eese External Trigger Input Test sees Variations in the Nay Me Appendices SDSCHICaUISBRS u mm ASCII amp IEEE 488 Bus IEEE 488 2 Devise Documentation Requirements C l Making Mixed Measurements
2. ento Measurement R3at sanan Advanced Trigger Mechanismns Front Panel Trigger Control eese nennen Computer Interface Trigger Control eee Both External and Monitor Alarms Disabled Type 0 External Trigger Enabled Type 1 eee Monitor Alarm Enabled Type 2 esee Thermal edet ette get thee When Measuring Resistance or Temperature R TD True RMS Measuremetnts eene nennen nennen rennen Effects of Internal Noise in AC Measurements Waveform Comparison True RMS vs Average Responding Making Mixed Measurements sees Using Shielded WINE EP po inaasa SURE 5 11 General Rule ird Alternate Suggestions Non Isolated Sensor Configuration iii 2620A 2625A Users Manual Isolated and Shielded Sensor Configuration 5 11 More 5 6 Introductio M es EM euin Line
3. Where to 50 From Here u n q a in a Ba 2620A 2625A Users Manual 1 2 Introduction 1 The Hydra Series Data Acquisition Unit Note This manual contains information and warnings that must be followed to ensure safe operation and retain the instrument in safe condition The Hydra Series Data Acquisition Unit The Hydra Series Data Acquisition Unit Model 2620A is a multi channel data acquisition unit able to measure ac and dc voltages temperature via thermocouples and RTDs resistance and frequency It features 21 measurement channels 8 digital input output lines a Totalizer input and 4 alarm output lines The Data Acquisition Unit is easily carried by hand and can be ac or de powered The user can choose communications with a host computer over an RS 232 standard or IEEE 488 2620A 05 computer interface Refer to Table 1 1 for a list of operating features The Hydra Series Data Logger The Hydra Series Data Logger Model 2625A combines data logging memory with the features of the Data Acquisition Unit The RS 232 computer interface is standard IEEE 488 capability is not available Options and Accessories Applications Software The following software packages are available for the instrument e Hydra Starter included with instrument Allows for communication from an IBM compatible personal computer through the RS 232 interface emphasizing tra
4. dst 0 dst 1 dst 2 Raw data output Inputs dst Destination for binary data must have enough space allocated the maximum needed is 6 timestamp bytes 3 bytes for temp units measurement rate and digital I O 4 bytes float 22 floating point values 97 bytes src Source ASCII string null terminated Outputs dst Set to binary data based on ASCII string Returns Number of bytes placed in destination buffer unsigned char dst char src src to dst xlate static struct nibtab s int lindex int lmask int lshift int rindex int rmask int rshift nibtab 3 left right 0 Ox3f 2 1 0x30 4 dst 0 from src 0 and src 1 Ll 0xO0f 4 2 9 3 2 dst 1 from src 1 and src 2 2 0x03 6 35 0x3f y 0 dst 2 from src 2 and src 3 auto unsigned char auto struct nibtab_s t auto unsigned char tmpsrc 4 auto int dst_bytes Number of bytes created dst_bytes 0 Process src in chunks of four while src Copy source filing holes at end with zeros for 0 lt 4 n if src tmpsrc n srctt 0 else tmpsrc n 0 Mung source into destination for t nibtab t lt amp nibtab 3 tt dst tmpsrc t gt lindex amp t gt lmask lt lt t gt lshift dst tmpsrc t rindex amp t gt rmask gt gt t rshift
5. RS 232 Promipls ree e eoo ERE erre Sample Program Using the RS 232 Computer Interface Using the IEEE 488 Interface eren eren TEEE 488 Operating Limitations rene Installing the IEEE 488 Enabling the TEEE 488 Interface Installation Testa s ua naa eere e e EE PER HERES General Information RS 232 and IEEEF 488 How the Instrument Processes IDp U NP Input Terminators Typical Input Stns u u Sending Numeric Values to the Instrument RS 232 and IEEE 488 Sending Input Strings to the Instrument How the Instrument Processes Output eee Service Requests IEEE 488 only and Status Registers Event Status and Event Status Enable Registers 51218 Byte Tu Iro RET Reading the Status Byte Register esee Service Request Enable Register esse Instrument Event Register Computer Interface Command Set seen Additional Considerations
6. True RMS Measurements Effects of Internal Noise in AC Measurements Waveform Comparison True RMS vs Average Responding Making Mixed Measurements aaa Using Shielded General Alternate Suggestions Non Isolated Sensor Configuration eene Isolated and Shielded Sensor Configuration In More Detail eere eter rece 5 1 2620A 2625A Users Manual 5 2 Additional Considerations 5 Introduction Introduction Chapter 5 discusses some topics that will help you use the instrument more effectively These considerations assume that you are familiar with the basic operation of the instrument and have some basic understanding of electronics Measurement Rate The two measurement rates provide a choice of maximum accuracy and noise rejection slow rate or maximum throughput fast rate The selected rate applies to all channels on the instrument Therefore your rate selection will be based on overall consideration of the speed and accuracy you need Exact measurement rates vary somewhat by type of measurement Refer to Appendix A Specifications for complete measurement rate information Advanced Trigger Mechanisms Normally th
7. Pertorm nce hist EEEE EG Accuracy Verification Channel Integrity Test Thermocouple Measurement Range Accuracy Test 4 Terminal Resistance Thermocouple Temperature Accuracy Open Thermocouple Response Test eene RTD Temperature Accuracy Test eese ene RTD Temperature Accuracy Test Using Decade Resistance Source RTD Temperature Accuracy Test Using DIN IEC 751 Digital Input Output Verification Tests eee Digital Output Test cei nie eco Digital Input Test i reete eher rte ent iei tek beider nea ree Pageant Totalizer Te t 2 asa Totalizer Sensitivity Dedicated Alarm Output Test eese External Trigger Input Test nere CaliDratlen u ia Variations in the 6 1 2620A 2625A Users Manual 6 2 Maintenance 6 Introduction Introduction This chapter describes basic maintenance that the instrument user can perform Do not attempt any maintenance not de
8. ERRORCODE lt gt 0 THEN PRINT ERROR Could not open coml END OPEN testdata prn FOR OUTPUT AS 2 Open data file ERRORCODE lt gt 0 THEN PRINT ERROR Could not open data file END PRINT 1 ECHO 0 Turn off command echo NUMBEROFCHANS 0 WHILE NUMBEROFCHANS lt 1 OR NUMBEROFCHANS gt 20 INPUT Enter number of channels 1 20 NUMBEROFCHANS WEND PRINT Wait FOR I NUMBEROFCHANS 1 TO 20 r Turn unused channels off PRINT 1 FUNC STRS I OFF GOSUB 800 NEXT CLS LOCATE 2 25 PRINT Sample Program for Hydra PRINT 1 IDN GOSUB 800 LINE INPUT 1 RESULTS LOCATE 3 20 PRINT RESULTS WHILE 1 Print banner line at bottom of screen LOCATE 25 1 PRINT 1 VDC 2 VAC 3 OHMS 4 FREQ 5 TEMP 6 QUIT FUNCS 0 WHILE FUNCS lt 1 OR FUNCS gt 6 LOCATE 23 INPUT Selection FUNCS WEND Exit and clean up if Quit FUNCS 6 THEN CLOSE 1 2 CLS KEY ON END r Set up later part of command string to Hydra function and range IF FUNC 1 THEN CMD VDC 1 IF FUNC 2 THEN CMD VAC 1 IF FUNC 3 THEN CMD OHMS 1 2 IF FUNC 4 THEN CMD FREQ 1 IF FUNC 5 THEN CMD TEMP K Set up Hydra LOCATE 23 1 PRINT Programming FOR I 1 NUMBEROFCHANS Program channels Figure 4 2 Sample Program Using the Computer Interface Using the IEEE 488 Interface 4
9. SOURCE C 1 YEAR 18 28 C 1000 0 0 12 C 2000 266 42 0 22 3000 558 00 0 37 C These figures assume that RTD is set to 100 00 ohms for each channel Accuracy given is for 4 wire measurements only For 2 wire measurements degrade the accuracy specifications by 5 2 C per ohm of single lead wire resistance For 2 wire measurements degrade the accuracy by an additional 11 channels 1 20 or 0 05 C channel 0 Maintenance 6 Performance Tests RTD Temperature Accuracy Test Using DIN IEC 751 1 2 3 4 Switch OFF power to the instrument and disconnect all other high voltage inputs Remove the Input Module from the rear of the instrument Open the Input Module and connect a Platinum RTD conforming to the European Standards IEC 751 DIN 43760 2 terminal RTD Connect the RTD s excitation leads to the H high and L low terminals of channel 1 4 terminal RTD Connect the RTD s excitation leads one red and one black wire to the H high and L low terminals of channel 1 Connect the RTD s second pair of red and black leads to the H and L leads of channel 11 refer to Figure 6 3 for proper connection Install the Input Module back into the instrument Note 4 terminal connections are made using pairs of channels 4 terminal measurements can only be made on channels 1 through 10 Their accompanying pairs are channels 11 through 20 Switch the instrument ON Ins
10. 4 CNC Configuration Corrupted The instrument configuration stored in NVRAM has been found to be corrupted The RAM CRC is no longer valid 5 6 not used 7 SCB Scan Complete Set high 1 when a measurement scan has been completed Computer Interface Command Set Generally RS 232 and IEEE 488 commands are identical A few exceptions apply only when the RS 232 interface is active See Table 4 7 for a summary of computer interface commands and queries A detailed description of each command or query can be found in Table 4 8 alphabetically arranged Note Computer interface command descriptions use angle brackets lt gt to denote a parameter that must be supplied by the user or a string that is returned by the instrument 4 22 Using the Computer Interface Computer Interface Command Set Table 4 7 Command and Query Summary Alarms ALARMS ALARM ASSOC ALARM ASSOC ALARM ASSOC CLR ALARM DO LEVEL ALARM DO LEVELS Active Alarms Query Associate Alarm Output Alarm Association Query Clear Alarm Association Set Alarm Output Level Alarm Output State Query ALARM LIMIT Set Alarm Limit ALARM LIMIT Alarm Limit Assignments Query Digital I O DIO_LEVELS Digital I O State Query DO_LEVEL Set Digital Output Level Function and Range FUNC FUNC RTD_RO RTD RO RANGE Channel Function Definition Channel Function Query RTD Ice Point RO RTD Ice Point RO Query Channel Range Query
11. IEEE 0 300 1 600 1200 2400 30 1 Select COMM Gut The left display shows IEEE or an RS 232 baud rate and bAUd appears in the right display Proceed with the following steps If IEEE is shown in the left display the IEEE 488 interface is already enabled Using the Computer Interface General Information RS 232 and IEEE 488 2 Press to scroll to IEEE then press to enable the IEEE 488 interface and disable the RS 232 interface IEEE will not appear in the left display if the IEEE 488 interface is not installed 3 The instrument must now be assigned an address 0 to 30 inclusive If you want to make a change scroll to the desired address with the and W buttons Then press to select the displayed address The address remains selected until it is changed Note Pressing at any point returns the instrument to the Inactive Mode leaving the original interface selection unchanged If RS 232 was active the instrument returns to RS 232 with all parameters unchanged Installation Test The procedure below demonstrates how the instrument processes a computer interface command and at the same time confirms that the instrument has been properly set up and cabled for IEEE 488 operations Note This is a program as entered from a Fluke 1722A Instrument Controller using Fluke BASIC commands Syntax may vary with the host computer and language Enter the foll
12. IEEE Common Commands includes Status Registers CLS Clear Status ESE Event Status Enable ESE Event Status Enable Query ESR Event Status Register Query IDN Identification Query OPC Operation Complete OPC Operation Complete Query RST Reset SRE Service Request Enable SRE Service Request Enable Query STB Read Status Byte Query TRG Trigger TST Self Test Query WAI Wait to continue IEE Instrument Event Enable IEE Instrument Event Enable Query IER Instrument Event Register Query 4 23 2620A 2625A Users Manual Table 4 7 Command and Query Summary cont 4 24 Lock LOCK Lock unlock front panel control keys LOCK Returns instrument front panel lock status Measurement Rate RATE RATE Select Measurement Rate Measurement Rate Query Measurement Values LAST Channel s Last Scan Value MAX Channel s Maximum Value MIN Channel s Minimum Value NEXT Next Scan s Values Monitor MON Enable Disable Monitoring MON_CHAN Monitor Channel Number MON_VAL Monitor Channel Value Mx B Scaling SCALE_MB Set Mx B Scaling Values SCALE_MB Mx B Scaling Values Query RS 232 Commands includes Autoprint LOG Retrieve Logged Data Query LOG_CLR Clear Logged Scans LOG_COUNT Logged Scan Count Query LOG_MODE Action when Internal Memory is Full LOG_MODE Action when Internal Memory is Full Query LOGGED Retrieve Scanned Data Query LOG_BIN Binary Upload o
13. 1 2345677 Figure 6 5 External Trigger Test Switch power ON 0022f eps 4 On Hydra Series II select the VDC function 30V range for channels 0 through 5 Select a scan interval of 30 seconds 5 Select trigger ON to enable the external trigger input Press the SHIFT and MON TRIGS buttons the display shows TRIG then press either the up or down arrow buttons to display ON Press ENTER 6 Press Hydra Series SCAN button Hydra Series should scan channels 0 through 5 once every 30 seconds 7 During the interval when scanning is not occurring connect short the test leads of the TR and ground Alarm Output terminals Ensure the connection causes a single scan to occur 8 Disconnect open the TR and ground connection Ensure the scan continues to execute at its specified interval Calibration Note Refer to the Fluke Hydra Series Service Manual P N 688868 for calibration procedures The instrument must be stabilized in an environment with ambient temperature of 22 to 24 C and relative humidity of less than 70 and have been turned on for at least 1 2 hour prior to calibration The instrument features closed case calibration controlled over the Computer Interface Using known reference sources closed case calibration has many advantages There are 6 21 2620A 2625A Users Manual no parts to disassemble no mechanical adjustments to make
14. For example you could monitor the output of a high pressure pump by using Mx B scaling to convert the millivolt output of a pressure transducer to PSI Such a transducer might output 0 to 30 mV corresponding to pressure of 0 to 5000 PSI The scaling values to convert the transducer millivolts to PSI would be M 166 67 PSI V and B 0 PSI calculated as follows Max Display Value Min Display Value 5000 M 166 67 Max Transducer Output Min Transducer Output 30 Min Display Value M Min Transducer Output 0 166 67 0 0 When a channel that has had scaling values entered is scanned or monitored the resulting scaled value is displayed without the underlying function annunciation The decimal point location and scale factor for the result is fixed by the value entered If the scaled value is too small to be represented in 5 digits given this scaling zero is displayed If the scaled value is too large OL overload is displayed even if the underlying measurement was on scale OL is also displayed if the measurement is in overload If scanning or monitoring a scaled channel gives unexpected results like zero or overload make the following checks 1 Verify that the values and scale factors of and are set as intended 2 Verify that the desired values are the correct values calculate the result for a few measured values using the entered and 3 Temp
15. This chapter describes how to set up and operate the instrument via the RS 232 interface standard with Hydra Series Data Acquisition Unit and Hydra Series II Data Logger or the IEEE 488 computer interface optional with Hydra Series Data Acquisition Unit only The RS 232 interface can also be connected to a serial printer for direct output of data in printed format With the IEEE 488 computer interface installed in the Hydra Series Data Acquisition Unit the instrument is fully programmable for use on the IEEE Standard 488 1 interface bus 1987 The instrument is also designed in compliance with supplemental IEEE Std 488 2 1987 This chapter assumes you are familiar with the basics of data communication the RS 232 interface and or the IEEE 488 bus For an introduction to the IEEE 488 interface request Fluke Application Bulletin AB 36 IEEE Standard 488 1978 Digital Interface for Programmable Instrumentation An annotated sample program illustrating the use of the RS 232 computer interface is provided at the end of this chapter Calibration procedures using the computer interface are provided in the Hydra Series II Service Manual P N 110731 Front Panel and Computer Interface Operations When the instrument is operated from the front panel it is said to be under front panel control When the instrument is operated from a host it is said to be operating under computer interface control Most operations that can be pe
16. to output only alarm data or trAnS to output data scanned only when the Hydra goes into or out of alarm Once the destination and mode have been set enable Memory Storage by pressing print The PRN annunciator lights to indicate that Memory Storage is enabled A Warning No data will be saved unless the PRN annunciator is lit on the on the Hydra from panel florescent display Memory contents can be sent to the RS 232 port for listing directly to a printer refer to Table 3 16 in Chapter 3 or through the computer interface Taking Measurements Before taking any measurements you might want to set up a few more channels set up three additional channels as described below Remember use or Y when in inactive Mode to select a channel and then press x Channel Function 0 V AC 300V range 1 V DC 30V range 2 leave set up as OFF 3 Resistance 3 mQ range 4 Thermocouple Temperature C or F 5 20 leave set up as OFF A Warning Inputs may be connected to live voltages To avoid electric shock remove inputs from live voltages before opening this module You need to connect wires to these channels before taking measurements Insert a pair of test leads into the jacks on the front panel for channel 0 For channels on the rear Input Module proceed as follows 1 Remove the input module from the rear panel 2 Loosen the two large screws on top and open the module 3 Connect wires to t
17. 300mV 15 05 049 150 V 3DMV See gt 0 26 0 19 VAC 300 mv en A 150V 450 4 12 150 V 800mV gt 1 38 1 08 Ohms 300 2 presens gt toome 130 0 59 10 0 3000 eee gt 1 81 0 75 Totalizing Input Input Voltage 30V maximum 4V minimum 2V peak minimum signal Isolation None dc coupled Threshold 1 4V Hysteresis 500 mV Input Debouncing None or 1 66 ms Rate 0 to 5 kHz with debouncing off Maximum Count 65 535 Digital Inputs Input Voltage 30V maximum 4V minimum A 12 Appendices A Specifications Isolation none dc coupled Threshold 1 4V Hysteresis 500 mV Trigger Input Input Voltages contact closure and TTL compatible high 2 0V min 7 0V max low 0 6V min 0 8V max Isolation None dc coupled Minimum Pulse Width 5 us Maximum Frequency 5Hz Specified Conditions The instrument must be in the quiescent state with no interval scans in process no commands in the queue no RS 232 or IEEE interface activity and no front panel activity if the latency and repeatability performance is to be achieved For addition information refer to Chapter 5 Maximum Latency Latency is measured from the edge of the trigger input to the start of the first channel measurement for the Specified Conditions above 480 ms for fast rate scanning DCV ACV ohms and frequency only 550 ms for fast rate scanning any thermocouple
18. For all other measurement queries Hydra Series II usually returns 1e9 for overload OL measurement values However for the LOG BIN query Hydra Series II returns Inf infinity instead The IEEE floating point standard defines Inf as a positive or negative maximum exponent number with a zero mantissa Hydra Series II returns Inf as the byte stream 7f 80 00 00 hex and Inf as ff 80 00 00 hex The C code in Figure F 2 converts raw data into a useful format for the Intel x86 IBM PC architecture The BCD time stamp is converted to integers and floating point numbers created for the totalizer and measurement values Example Figure F 3 is a short example that uses the routines in Figures F 1 and F 2 to decode a fixed pre computed LOG BIN response string When compiled and run on an Intel architecture computer the program should print Conversion worked Although this example is useful for educational purposes it is not very efficient If desired the decoding and conversion processes can be combined into a single fast algorithm E 4 Appendices Binary Upload of Logged Data LOG BIN 2625A only Import globals from main program extern int timestamp been int misc extern float values convert Convert LOG BIN array of binary data into useful data Converts BCD values to integer raw floating point values into float values usable under the Intel x86 IBM P
19. Maintenance 6 Performance Tests Table 6 1 Power Up Error Codes Error Description ROM checksum error External RAM test failed Internal RAM test failed Display power up test failure Display not responding Instrument configuration corrupted EEPROM instrument configuration corrupted EEPROM calibration data corrupted A D not responding A D ROM test failure A D RAM test failure O O gt o Q N A D self test failure Each of the measurements listed in the following steps assume the instrument is being tested after a 1 2 hour warm up in an environment with an ambient temperature of 18 to 28 degrees C and a relative humidity of less than 70 Note All measurements listed in the performance test tables are made in the slow reading rate unless otherwise noted A Warning The 2620A 2625A instrument contains high voltages that can be dangerous or fatal Only qualified personnel should attempt to service the instrument Turn off the Hydra Series Il and remove all power sources before performing the following procedures 6 5 2620A 2625A Users Manual 6 6 Table 6 2 Recommended Test Equipment Instrument Type Multifunction Calibrator Decade Resistance Source Mercury Thermometer Thermocouple Probe Room Temperature Oil Water Bath Multimeter Signal Generator Minimum specifications are the same as in the Standard Equipment List Instrument Type DC Voltag
20. 2047 scans Storing additional scans causes the oldest scans to be overwritten 3 25 2620A 2625A Users Manual Table 3 17 Autoprint Memory Storage Selection Press these buttons P To select from these choices Note 7 Note 2 Destination Mode MOdE dESt Note Note 2 1 MODE A A prr emn v v Print ALL StorE ALAr both trAnS Print Sends data to be printed through the RS 232 interface StorE Sends data to be stored in memory Hydra Data Logger only both Sends data to be stored and printed Hydra Data Logger only ALL Measurements for all defined channels are printed stored when a scan occurs ALAr Measurements for all defined channels are printed stored when a scan occurs and at least one channel is in alarm trAnS Measurements for all defined channels are printed stored when a scan occurs and at least one channel has transitioned into or out of alarm since the last scan To Initiate Hold rr and press CLEAr appears in right display 4 YES Table 3 18 Clearing Memory Storage To Confirm no to exit without clearing to exit without clearing To Activate Front Panel Lock out Conditions Various methods are available to prevent accidental use of the front panel buttons These actions can be initiated from either the front panel or the computer interface Front Panel Review Only Func
21. 254 4 Disconnect input 0 from ground then jumper input 1 to ground Send the command DIO LEVELS CR Verify the returned value is 253 5 Repeat step 4 for each input and verify the correct returned value See Table 6 7 TERMINAL GROUNDED none O oO C Table 6 7 Digital Input Values STATE OF DIGITAL INPUTS inputs 0 7 all HIGH inputs 1 7 HIGH input 0 LOW inputs 0 2 7 HIGH input 1 LOW inputs 0 1 and 3 7 HIGH input 2 LOW inputs 0 2 and 4 7 HIGH input 3 LOW inputs 0 3 and 5 7 HIGH input 4 LOW inputs 0 4 and 6 7 HIGH input 5 LOW inputs 0 5 and 7 HIGH input 6 LOW inputs 0 6 HIGH input 7 LOW DECIMAL VALUE 255 254 253 251 247 239 223 191 127 Totalizer Test This totalizer verification test requires toggling the Digital Output line 0 and using it as the Total input The test requires computer interfacing with a host terminal or computer The host must send commands to the 2620A 2625A instrument to control the digital line for this test Refer to Chapter 4 for a description of configuring and operating the Hydra Series II instrument 1 Ensure that communication parameters 1 transmission mode baud rate parity and echo mode on the Hydra Series II and the host are properly configured to send and receive serial data Refer to Chapter 4 2 Switch OFF power to the instrument and disconnect all high voltage inputs Remove the Digital I O ten terminal connector from the rea
22. B when the function for that channel is changed Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont SCALE_MB Mx B Scaling Values Query Return the M and B scaling values for the indicated channel SCALE MB channel channel 0 20 If the channel number given is invalid an Execution Error is generated Remember that Mx B scaling values are automatically reset to 1 M and 0 B when the function for that channel is changed This command returns three values The first two are the M and B values for the channel indicated even when 1 and 0 or the function is defined as OFF These first two values are returned in M and B order and in scientific notation format with five digits of resolution The third value returned indicates the Mx B resultant display range SCAN Enable Disable Scanning This command performs the same function as on the front panel SCAN 1 Enable scanning SCANO Disable scanning any scan in progress is completed first If there are no configured channels all are defined as OFF or values other than 0 or 1 are given an Execution Error is generated The MON and SCAN commands work in conjunction with the front panel controls The Monitor and Scan functions can be enabled or disabled from either the front panel or the computer interface The most recently specified monitor channel from front panel or computer interface
23. Numeric values can be sent to the instrument as integers real numbers or real numbers with exponents as shown in the following examples EXAMPLE EXPLANATION 12345 Sends the signed integer 12345 123 45 Sends the real number 123 45 1 2345E2 Sends 1 2345 x 10 Sending Input Strings to the Instrument Observe the following rules when you construct strings to be sent to the instrument over the computer interface e RULE 1 READ THE INSTRUMENT S OUTPUT BUFFER ONLY ONCE FOR EACH QUERY COMMAND This rule applies to the IEEE 488 interface only The instrument s output buffer is cleared after it has been read This prevents previously read data from being read a second time by mistake If you attempt to read the instrument s output buffer twice the instrument generates a query error e RULE 2 READ QUERY RESPONSES BEFORE SENDING ANOTHER INPUT STRING This rule applies to the IEEE 488 interface only Output data remains available in the output buffer until it is read by the host or until the next input string is received by the instrument This means the instrument s output buffer must be read by the host before rather than after the next input string is sent to the instrument Otherwise unread data in the buffer is overwritten e RULE 3 THE INSTRUMENT EXECUTES EACH COMMAND COMPLETELY IN THE ORDER RECEIVED BEFORE MOVING ON TO THE NEXT COMMAND If an input string contains a trigger enter the commands from
24. becomes the one channel monitored Front panel and buttons work only when the lockout state is LOCS SCAN Return scan status If a scan is in progress a 1 is returned at the end of the scan A response delay may occur if SCAN is sent early in a scan This feature allows synchronization for other commands that would not be recognized if received during a scan For example SCAN TRG could be used to trigger a new scan after completion of the current scan Otherwise a TRG command sent while a scan is in progress would be discarded If a scan is not in progress 0 is returned immediately SCAN TIME Time of Scan Returns values indicating the time and date at start of last scan Uses the same format and order as the TIME DATE query The data is returned in the following order Hours 0 23 Minutes 0 59 Seconds 0 59 Month 1 12 Date 1 31 Year 0 99 Setting of time does not include seconds but retrieval of time does TEMP CONFIG Temperature Configuration Set temperature configuration using the given value Successful execution of this command clears all Review array values all channels TEMP CONFIG value value encoded bit fields 4 43 2620A 2625A Users Manual 4 44 Table 4 8 Command and Query Reference cont Use the lowest two bits of the value given as individual flags to specify the temperature configuration Therefore the value given must be i
25. eese rene Front Panel Monitor Only Function eene Computer Interface Initiated Lockouts eee REM Arinunciator Calibration uei ione does eise reete Using the Computer INTO MUCH OM Front Panel and Computer Interface Operations Types of Computer Interface Using the RS 232 Computer Setting Communication Parameters RS 232 Autoprint and Memory Storage RS 232 sese Contents continued Autoprint Computer Interface Control Autoprint Output 2 au aaa Memory Storage Computer Interface Control Memory Retrieval Qasa aa Memory Full Operation ressissaad Cle arin Memory EM Cabling the Instrument to a Host or Printer RS 232 Installation Testa o Koa e ve ete E ee dese 5 232 Informations 5 5 o Character Echoing Character Deletion uu Device Clear Usina Ctrl
26. 2 5 2 6 3 1 3 2 3 3 3 4 4 2 4 3 4 4 5 1 5 2 5 3 6 2 6 3 6 4 E 1 E 2 1 2 3 Fa F 6 List of Figures Adjusting Pront Panel Left Display inde au nha Right UELUT ulus PME Configuration Mode iini PE aa Input Module Connections 2 Terminal and 4 Terminal Connections eene Totalizing Connection Iber Nin duc E Sample Pro Sram m Typical Input Strings erecti tiere etre 4 15 Overview of Status Data Registers External Trig per ter epe nae ete do eth CI EUR pel lae Dua 2T and AT Connections ennt Comparison of Common Waveforms eese Replacing the Line Fuse 4 Terminal Connections to 5700A essent 4 Terminal Connections to Decade Resistance Box Dedicated Alarms Output 6 20 External Trigger usen ASCH String 2 Floating Point Conversion
27. 4 mV 20 kHz 50 kHz 0 6 3 0 mV 0 6 5 0 9 3 0 mV 0 9 5 50 kHz 100 kHz 1 0 5 0 mV 1 0 10 mV 1 4 5 0 mV 1 4 10 mV 20 Hz 50 Hz 1 43 25mV 1 43 40 mV 1 58 25 1 58 40 mV 50 Hz 100 Hz 0 29 25 mV 0 29 40mV 0 45 25 mV 0 45 40 mV 30V 100 Hz 10 kHz 0 15 25mV 0 15 40 mV 0 30 25mV 0 30 40 mV 10 kHz 20 kHz 0 22 25 0 22 40 0 40 25 mV 0 40 40 mV 20 kHz 50 kHz 0 9 30 mV 0 9 50 mV 1 1 30 mV 1 1 50 mV 50 kHz 100 kHz 2 0 50 mV 2 0 100 mV 2 2 50 mV 2 2 100 mV 20 Hz 50 Hz 1 42 0 25V 1 42 0 4V 1 57 0 25 1 57 0 4 50 Hz 100 Hz 0 29 0 25V 0 29 0 4V 0 44 0 25V 0 44 0 4V 300V 100 Hz 10 kHz 0 14 0 25V 0 14 0 4V 0 29 0 25V 0 29 0 4V 10 kHz 20 kHz 20 kHz 50 kHz 50 kHz 100 kHz 0 22 0 25V 0 9 0 30V 2 5 0 50V 0 22 0 4V 0 9 0 5V 2 5 1 0V 0 38 0 25V 1 0 0 30V 2 6 0 50V 0 38 0 4V 1 0 0 5V 2 6 1 0V 7 2620A 2625A Users Manual A 8 Frequency 20 Hz 50 Hz 50 Hz 100 Hz 100 Hz 10 kHz 10 kHz 20 kHz 20 kHz 50 kHz 50 kHz 100 kHz Input Impedance Maximum Input at Upper Frequency 300 V rms 300 V rms 200 V rms 100 V rms 40 V rms 20 V rms 1 MQ in parallel with 100 pF maximum Maximum Maximum Crest Factor 3 0 2 0 for rated accuracy Crest Fa
28. 5 3 Computer interface initiated lockouts 3 27 Connections 3 22 Cross talk rejection 6 D DC volts ac volts frequency and 222 Decoding the ascii string E 1 Dedicated alarm output test Device clear using ctrl c Digital input test 6 16 Digital input output verification tests 6 15 Digital output test 6 16 E Enabling the IEEE 488 interface Entering and changing numeric values Example E 4 External trigger enabled s 1 5 4 External trigger input test 6 21 External triggering 3 16 F Floating point conversion 3 Front panel and computer interface operations 4 3 Front panel lock out conditions 3 26 Front panel monitor only function 3 26 Front panel review only function 2620A 2625A Users Manual Front panel trigger control 5 3 G General General information RS 232 and IEEE 488 How the instrument processes input 4 13 Hysteresis 12 IEEE 488 operating limitations 4 9 If power is interrupted 3 4 If the configuration is reset 3 4 Implementation of IEEE standard 488 2 1987 C 1 Input debouncing Input protection A 9 Input strings 4 14 Input terminators 4 14 Input voltage Installation test Installing the IEEE 488 interface Instrument configuration 3 14 Isolation A 12 L Line fuse 6 3 List button functions 3 23 Maximum autoranging time 12 Measurement connections Meas
29. Active or Inactive Mode only by pressing Note that either the Review array or the Totalizer count can be displayed at one time you must deactivate one before activating the other Deactivate the Review array by pressing a second time Deactivate the Totalizer display by pressing a second time Pressing also deactivates either function What is the Present Configuration If Power is Interrupted All configuration settings function range scan interval etc are stored in nonvolatile memory If power is interrupted Cowen pressed off or due to power loss these settings are retained When turned on the instrument first executes a self test then resumes the state it was in prior to interruption of power This feature is handy for applications where power may be inadvertently lost the instrument automatically resumes taking measurements as originally configured once power is restored If the Configuration is Reset You can perform a Configuration Reset in either of two ways e From the front panel press and hold when cycling POWER ON e Through the computer interface send the RST command Refer to Table 3 1 for the configuration reset settings Channel Configuration Configuration Mode involves selecting an entry from a list of choices and may involve setting number values Measurements are not taken when the instrument is in Configuration Mode Configuration Mode is discussed throughout this chapter it is u
30. FROM THESE CHOICES BUTTONS Channel Function 4 exe m m 0 OFF 1 V DC V AG Q Hz 20 C or F Note 1 Determine the highest resistance value anticipated for this channel Then select a range large enough to accommodate this value If the highest resistance cannot be anticipated select Auto Range Note 1 Terminals a a Auto 2T Completes 300 00 Q 4T Selection 3 0000 kQ and returns 30 000 to Inactive 300 00 kQ Mode 3 0000 MQ 10 000 MQ Note 2 4T allowed on channels 1 through 10 only For each 4T channel an additional channel 10 channels higher is reserved to provide the third and fourth terminals Channels 11 through 20 are available for this purpose Any channel so reserved cannot be used for other definitions Table 3 4 Frequency Range Channel Function Note PRESS THESE Hung BUTTONS 02 02 02 TO 0 OFF Auto Completes SELECT VDC 900 00 Hz Selection FROM 1 V AC 9 0000 kHz and returns THESE Q 90 000 kHz to Inactive CHOICES Hz 900 00 kHz Mode 20 C or F 1 0000 MHz Note Determine the highest frequency anticipated for this channel Then select a range large enough to accommodate this value If the highest frequency cannot be anticipated select Auto Auto does not cause any delays for frequency measurements 3 7 2620A 2625A Users Manual Table 3 5 Thermocouple Temperature Range Channel Function
31. NUL W 0 e a k MSAO P MSA16 e 1 1 17 33 2 41 61 113 71 0001 a 1 a DC1 MLA1 MLA17 on Q MSAi MSA17 18 15 22 x 42 62 114 72 0010 b r Pu 5 MLA2 B MTA2 2 2 r MSA18 19 13 35 23 67 43 63 115 73 0011 5 E i dax d m e s MTA19 MSA3 MSA19 4 e 14 s 24 56 D 44 T 54 ix 64 T 74 SDC DCL s T o L wam D MTM T 20 MSA4 t MSA20 5 21 15 37 25 69 45 65 117 75 0101 P 5 5 a aa MSA5 MSA21 6 22 16 38 26 70 46 102 66 118 76 0110 F f sex un s 5 _ 6 v MTA22 MSAG MSA22 23 17 5 27 7i 47 57 1 67 i 77 01114 BEL Ww g w BEL MLA7 7 a G 2 w NIE MSA7 w MSA23 n 40 28 72 48 14 68 120 78 1000 BS 4 x h x SET A SPE a H MTA8 4 MSA8 MSA24 19 41 29 73 49 m 69 a 79 1001 HT 9 I Y i y TCT SPD A MTA9 Y 25 MSA9 y MSA25 7 26 TAL 42 2 74 4A 5A T 6A 122 7A 1010 LF J j 2 MLA10 J 10 2 26 10 z MSA26 27 1B 43 2 75 4B 6B 123 7B VT ESC um MLA2T J MTA11 L MTA27 11 MSA27 12 C 28 1C 2c 60 76 4C 5C 8 6 124 7 a 12 lt EAM L MTA12 E 2 12 MSA28 2D 61 3D 77 4D 5D 55 6D 125 7D 1101 m MLA13 MLA29 M HA 1 MTA29 MSA13 MSA29 X 46 2E 62 78 4 94 5 126 MLATA gt amm N D ia M
32. On Hydra Series II press MON and ensure the display reads between the minimum and maximum values shown on Table 6 3 The 4 terminal Resistance Test is complete However if you desire to perform this test on Input Module channels 2 through 10 repeat steps 1 through 7 substituting in the appropriate channel number Maintenance 6 Performance Tests Note 4 terminal connections are made using pairs of channels 4 terminal measurements can only be made on channels 1 through 10 accompanying pairs are channels 11 through 20 Thermocouple Temperature Accuracy Test Assure the Thermocouple Measurement Range Accuracy Test meets minimum acceptable levels before performing this test 1 2 Switch OFF power to the instrument and disconnect all high voltage inputs Remove the Input Module from the rear of the instrument Open the Input Module and connect a K type thermocouple to the H high and L low terminals of channel 1 Install the Input Module back into the instrument Note If other than a K type thermocouple is used be sure that the instrument is set up for the type of thermocouple used Reconnect power and switch the instrument ON Insert the thermocouple and a mercury thermometer in a room temperature bath Allow 20 minutes for thermal stabilization Select the temperature and K type thermocouple function for channel 1 Press MON The value displayed should be the temperature of the room temperature bath as measu
33. Set scan interval time INTVL lt hours gt lt minutes gt lt seconds gt lt hours gt 0 9 lt minutes gt 0 99 lt seconds gt 0 99 An Execution Error is generated if values outside the specified ranges are used or if measurements are active INTVL Scan Interval Query Return scan interval time Returns three values hours minutes and seconds LAST Channel s Last Scan Value Returns value s for channels measured in the most recent scan The value returned represents data from the most recent scan The most recent scan is the scan in progress or if scanning is not in progress the last completed scan LAST lt channel gt lt channel gt 0 20 Returns measurement values for either the indicated channel or all defined channels If the channel specification field is left blank values for all defined channels are returned values for channels defined as OFF are not included An Execution Error results if a request is made for a channel defined as OFF the channel specified is invalid the channel specified has been set up but not yet measured or Review array values have been cleared The response is a signed number with decimal point and exponent For slow scanning rate 5 digits are returned XX XXXE X for fast scanning rate 4 digits are returned XX XXE X The range setting determines placement of the decimal point For values of all defined channels no channel s
34. Volt Hertz product any range normal mode input 1 x 10 Volt Hertz product on any range common mode input Cross Talk Rejection Refer to Appendix D A 10 Appendices A Specifications Typical Scanning Rate See table below The measurement conditions are averaged rate over 20 scans continuous scanning alarm limits and Mx B scanning set on all channels logging data to internal memory and RS 232 communications set at 9600 baud Measurements were taken with short circuit inputs on all channels except frequency which was taken with SV at 15 Hz on all channels CHANNELS FUNCTION RANGE SLOW FAST 1 10 20 1 10 20 VDC 300 mV 1 8 3 9 4 1 2 5 13 2 18 3 3V 1 8 3 9 4 1 2 5 13 2 18 4 30V 1 8 3 9 4 1 2 5 13 2 18 2 150 300V 1 8 3 9 4 1 2 5 13 2 18 1 AUTO 1 8 3 6 3 9 2 4 11 3 14 1 TEMPERATURE J TC 1 0 3 3 3 8 2 1 10 9 15 2 PT RTD 1 7 3 1 3 2 2 1 6 0 6 7 VAC 300 mV 1 1 1 5 1 6 1 3 2 5 2 6 3V 1 1 1 5 1 6 1 3 2 5 2 6 30V 1 1 1 5 1 6 1 3 2 5 2 6 150 300V 1 1 1 5 1 6 1 3 2 5 2 6 AUTO 1 0 1 5 1 5 1 3 2 4 2 5 OHMS 3002 1 7 3 1 3 2 2 1 6 0 6 7 3 kQ 1 7 3 1 3 2 2 1 6 0 6 7 30 kQ 1 7 3 1 3 2 2 1 6 0 6 7 300 1 2 1 8 1 8 1 8 4 1 4 4 3 MQ 1 1 1 6 1 7 1 8 3 9 4 2 10 MQ 1 1 1 6 1 6 1 7 3 8 4 0 AUTO 1 7 3 1 3 2 2 1 6 0 6 7 FREQUENCY ANY 0 5 0 6 0 6 0 6 0 7 0 7 11 2620A 2625A Users Manual Maximum Autoranging Time Seconds per Channel Function Range Change Slow Fast
35. amp amp Seconds EA timestamp 3 0 amp amp Month timestamp 4 amp amp Day timestamp 5 1 amp amp Year misc 0 amp amp Temp units and rate misc 1 15 amp amp Alarm outputs wy misc 2 255 amp amp Digital I O x values 0 0 0 amp amp Totalizer isnan values 1 amp amp Channel 1 data xf isinf values 2 amp amp Channel 5 data values 3 12209291 Channel 10 data printf Conversion workedMn else printf ERROR conversion did not succeed n exit 0 your math library supplies alternatives to isnan or isinf use them instead ths in isnan This is not portable or completely accurate since NaN mantissa must only be non zero the sign bit can be set but this works for NaN values returned by Hydra wf Compiler was free to promote to double float ff f return unsigned long amp ff 0 7 000001 int isin 422 fi Again this is not portable but this time it is accurate Compiler was free to promote to double float ff f return E 6 unsigned long amp ff unsigned long amp ff 0 7 8000001 Oxff8000001 Figure E 3 Example Appendix F RS 232 Cabling Introduction This appendix details the RS 232 cabling between the instrument and a PC instrument controll
36. and 0 through 3 terminals Leave other ends of wires unconnected at this time Reinstall the connector Remove the Input Module from the rear of Hydra Series II Open the Input Module and jumper the H high terminal of channels 1 2 and 3 together Connect a test lead to the H of channel 1 Also jumper the L low terminals of channel 1 2 and 3 together Connect a second test lead to the L of channel 1 Install the Input Module back into Hydra Series II Refer to Figure 6 4 Switch power ON Using a digital multimeter DMM verify that alarm outputs 0 through 3 are in the OFF or HIGH state Perform this test by connecting the low or common of the multimeter to the ground test lead and the high of the multimeter to the alarm output Verify a voltage greater than 3 8V Connect a cable from the Output VA HI and LO connectors of the 5700A to the VQ and COM connectors on the front panel of Hydra Series II Then jumper Hydra Series VQ terminal to the H high test lead of the Input Module and the COM terminal to the L low test lead See Input Connection diagram On Hydra Series II select the VDC function 3V range and assign a HI alarm limit of 1 0000 for channels 0 through 3 Set up all other channels 4 20 to the OFF function Select a scan interval of 5 seconds Set the 5700A to output 0 9900 volts Press Hydra Series SCAN button Hydra Series should scan channels 0 through 3 every 5 seconds Using a digital m
37. channels 1 and 11 each channel providing two connections Thermocouple Measurement Range Accuracy Test Assure the Accuracy Verification Test for channel 0 meets minimum acceptable levels before performing this test Thermocouple temperature measurements are accomplished using Hydra Series internal 100 mV and 1V dc ranges The ranges are not configurable by the operator This procedure will provide the means to test these ranges To test the 100 mV and 1V dc ranges requires computer interfacing with a host terminal or computer The host must send commands to select these ranges These ranges cannot be selected from the front panel of Hydra Series II 1 Ensure that communication parameters i e transmission mode baud rate parity and echo mode on the Hydra Series and the host are properly configured to send and receive serial data Refer to Chapter 4 2 Power up Hydra Series II and allow it to temperature stabilize for 1 2 hour 6 9 2620A 2625A Users Manual Connect a cable from the Output VA HI and LO connectors of the 5700A to the VQ and COM connectors on the front panel of the Hydra Series II Instrument Set the 5700A to output OV Using either a terminal or a computer running a terminal emulation program as the selected host send the following commands to Hydra Series II FUNC 0 VDC I100MV CR MON 1 0 CR MON VAL CR The returned value for channel 0 should be 0 mV 0 006 mV
38. from the list of measurement functions then press even Chapter 3 of the manual explains how to change temperature measurement units 4 The instrument then offers a choice of 9 different thermocouple types as well as Pt for platinum RTD s Press W to select a thermocouple type then press This completes the setup for the channel and the instrument returns to Inactive Mode When setting up a channel to measure the instrument also prompts for 2 Terminal vs 4 Terminal measurements and then allows you to specify a value for RO Note that Channel 0 cannot be set up to measure thermocouples or 4 Terminal RTD s Subsequent sections of the manual explain how to set up alarm values and Mx B linear scaling for each channel Selecting the Scan Data Destination The 2620A will always send the scan data to the RS 232 printer port following each scan The 2625 can be configured to send the scan data to the RS 232 printer port or to the internal Memory Storage or to both simultaneously Begin this procedure by selecting MODE shift print Select the scan data destination dESt in the right display as Print left display to send the data to the RS 232 port as StoreE to send the data to Memory Storage or as both for simultaneous storage and printing Then xii Getting Started continued select the mode Mode right display from to output all scan data
39. progress the last completed scan MIN lt channel gt lt channel gt 0 20 If the channel specification field is left blank values for all defined channels are returned Channels defined as OFF are not included An Execution Error results if a request is made for a channel defined as OFF the channel specified is invalid the channel specified has been set up but not yet measured or Review array values have been cleared The response is a signed number with decimal point and exponent For slow scanning rate 5 digits are returned XX XXXE X for fast scanning rate 4 digits are returned XX XXE X The range setting determines placement of the decimal point For minimum values of all defined channels no channel specification made undefined OFF channels are not included For each defined channel a separate signed number with decimal point and exponent is returned Commas separate numbers for different channels and no blank spaces are included MON Enable Disable Monitoring This command performs the same function as on the front panel MON 1 lt channel gt Enables monitoring of given channel if monitoring is disabled Changes monitored channel if monitoring is already enabled MON 0 Disables monitoring The lt channel gt parameter can be 0 through 20 A command error is generated if no lt channel gt parameter is given when enabling monitoring If the channel to be monitored is invalid or def
40. 0 70 1 18 1 24 1 77 150 to 0 0 68 0 69 1 49 0 82 1 71 0 to 120 0 45 0 46 0 95 0 59 1 13 120 to 400 0 37 0 39 0 80 0 61 1 02 250 to 400 0 86 0 88 2 49 1 03 2 68 R 400 to 1000 0 90 0 94 2 28 1 34 2 63 1000 to 1767 1 49 1 58 3 12 2 39 3 95 250 to 1000 1 00 1 05 2 68 1 47 2 93 5 1000 to 1400 1 22 1 29 2 74 1 86 3 33 1400 to 1767 1 66 1 76 3 54 2 61 4 43 600 to 1200 1 18 1 19 3 61 1 35 3 77 B 1200 to 1550 1 14 1 19 2 57 1 60 2 99 1550 to 1820 1 33 1 39 2 86 1 93 3 41 0 to 150 0 74 0 76 1 93 0 89 2 11 150 to 650 0 69 0 73 1 66 1 08 2 04 650 to 1000 0 89 0 95 2 00 1 48 2 57 1000 to 1800 1 72 1 85 3 46 2 99 4 65 1800 to 2316 2 60 2 82 5 35 4 80 7 40 Sensor inaccuracies are not included A 4 Appendices A Specifications Input Impedance 100 minimum in parallel with 150 pF maximum Common Mode and Normal Mode Rejection See Specifications DC Voltage Inputs Cross Talk Rejection Refer to Appendix D Open Thermocouple Detect Small ac signal injection and detection scheme before each measurement detects greater than 1 to 4 as open Performed on each channel unless defeated by computer command RTD Inputs Type DIN IEC 751 1000 Platinum 385 IEC 751 Amendment 1 100 Platinum IPTS 68 RTD 4 Wire C Temperature Resolution 18 C to 28 C 0 C to 60 C C Slow Fast 90 Day 1 Year 1 Year 1 Year 1 Year Slow Slow F
41. 1 13 120 to 400 0 36 0 38 0 78 0 61 1 01 250 to 400 0 83 0 85 2 47 1 03 2 66 R 400 to 1000 0 80 0 82 2 31 1 16 2 54 1000 to 1767 0 93 1 02 2 51 1 80 3 31 250 to 1000 0 87 0 89 2 60 1 27 2 79 5 1000 to 1400 0 83 0 89 2 35 1 47 2 94 1400 to 1767 1 08 1 17 2 90 2 00 3 76 600 to 1200 1 07 1 09 3 50 1 24 3 66 B 1200 to 1550 0 73 0 76 2 24 1 17 2 56 1550 to 1820 0 79 0 85 2 32 1 39 2 87 0 to 150 0 75 0 77 1 94 0 89 2 12 150 to 650 0 63 0 65 1 63 0 98 1 94 650 to 1000 0 71 0 76 1 82 1 30 2 39 1000 to 1800 1 12 1 25 2 86 2 39 4 05 1800 to 2316 1 96 2 18 4 71 4 15 6 76 Sensor inaccuracies are not included A 3 2620A 2625A Users Manual Temperature Measurements Accuracy Thermocouples ITS 90 Thermocouple Accuracy C 18 C to 28 C 0 C to 60 C Type Temperatur 90 Days 1 Year 1 Year 1 Year 1 Year C e Slow Slow Fast Slow Fast C 100 to 30 0 44 0 45 0 92 0 57 1 10 J 30 to 150 0 41 0 43 0 83 0 61 1 06 150 to 760 0 48 0 53 0 98 0 92 1 42 100 to 25 0 53 0 54 1 14 0 66 1 33 K 25 to 120 0 46 0 48 0 96 0 66 1 19 120 to 1000 0 79 0 85 1 55 1 45 2 20 1000 to 1372 1 32 1 42 2 30 2 29 3 23 100 to 25 0 63 0 64 1 44 0 75 1 61 N 25 to 120 0 53 0 54 1 21 0 66 1 39 120 to 410 0 45 0 48 1 05 0 73 1 30 410 to 1300 0 88 0 95 1 70 1 63 2 41 100 to 25 0 46 0 47 0 92 0 59 1 10 E 25 to 350 0 39 0 42 0 77 0 65 1 02 350 to 650 0 47 0 51 0 90 0 88 1 30 650 to 1000 0 63
42. 2047 scans of up to 21 channels representing up to 42 987 readings Hydra Data Logger only Introduction Where to go From Here 1 Accessories Accessories available for the instrument are described in Table 1 2 Table 1 2 Accessories Model 801 410 801 1010 802 10 2620 05 2620 901 40 00 200 634 8922 RS40 RS41 RS42 TL20 TL70 Y8021 Y8022 Y8023 Y9109 Fluke PN 268789 Description Clamp On DC AC Current Probes Current Shunt Field installable IEEE 488 Option kit Hydra Data Acquisition Unit only Hydra Data Logger Applications Package Soft carrying case Provides padded protection for the instrument Includes a pocket for the manual and pouch for the line cord Rackmount Provides standard 19 inch rack mounting for one instrument right or left side Switchable x1 x10 passive probe Shielded RS 232 terminal interface cable Connects the instrument to any terminal or printer with properly configured DTE connector DB 25 socket including an IBM PC R IBM PC XT R or IBM PS 2 models 25 30 50 P60 70 and 80 Shielded RS 232 modem cable Connects the instrument to a modem with properly configured DB 25 male pin connector Use an RS40 and an RS41 cable in series to connect with an IBM PC AT R Serial printer cable Contact Fluke for list of compatible printers Industrial test lead set Test lead set Shielded IEEE 488 one meter cable with
43. 2620A 2625A Users Manual AC Signal Cross Talk Into an AC Voltage Channel VACrms error ACV Error Ratio VACrms crosstalk x Frequency crosstalk Range Ratio worst case Ratio typical lt 2 10 Ly x Im Hz 150 00 300 00 1 2x IO 3 4X us Hig For example to find the ef ect of a 60 iz 926 signal on another channel for the 300 mV range you would calculate 220 X 60 X 1 4 X 10 0 18 mV AC Signal Cross Talk Into an Ohms Channel AC Frequency 50 60 Hz 0 1 OHMS Error Rai VACrms crosstalk Range Ratio worst case Ratio typical x 31 3 0000 LS 24x ore 30 000 3 1 x 10 E y lo mer Vrms Vrms Vrms h h 300 00 5 6x 47x Vrms Vrms MOh MOh 3 0000 3 8 x uk 3 8x 91 rms Vrms 10 000 14x 10 dde 3 Vrms Vrms For example to find the typical effect of a 60 Hz 100V ac signal on another channel for the 30 kQ range you would calculate 100 X 8 4 X 10 5 0 008 kQ AC Signal Cross Talk Into a Frequency Channel Frequency measurements are unaffected by cross talk as long as the voltage frequency product is kept below the following limits Worst Case Typical V x Hz Product Limit 3 7 x 10 V x Hz 1 0 x 10 V x Hz These values assume no more than 1000 pf of capacitance between either end of the resistor HI and LOW and earth ground D 2 Appendic
44. 3 9 2620A 2625A Users Manual Alarm evaluation is not carried out for a channel if The limit sense is changed to OFF Alarm checking and the alarm limit values are re enabled by setting limit sense to HI or LO e open thermocouple has been detected on that channel thermocouple temperature function only Table 3 7 Alarm Selection Channel Alarm PRESS Complete Alarm THESE Parameters Below BUTTONS m TO 0 SELECT FROM 1 Hor E THESE CHOICES 20 Alarm Parameters Alarm Sign Decimal Multiplier Note 2 Limit Value Point Note 1 Position PRESS a a A THESE BUTTONS lt lt gt gt gt TO OFF 0000 0 0000 SELECT HI 00 000 FROM LO 000 00 k THESE 0000 0 M CHOICES Note 1 Alarm limit can be cycled through HI LO and OFF without resetting the alarm value Note 2 Multiplier definitions available for each decimal point position m 001 x1 1 0 k 1000 M 1000000 Alarm Indications Generally the ALARM annunciator is dimly lit whenever the last measurement on any channel was found to be in alarm When the displayed channel is in alarm during review the ALARM annunciator flashes LIMIT is lit and additional annunciators show the alarm limit as ll and or B and the alarm sense as or LO Operating the Instrument from the Front Panel Channel Configuration Alarm annunciation is disabled when the instrument is in Inactive or Co
45. 900 2 2 3V 9 2 3 30 V 30 90 kHz 4 150 300 V 300 900 kHz 5 Error 3 MQ 1 Mhz 6 Error 10 MQ Error Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont For temperature functions the range is a thermocouple type J N R S B C or DIN IEC 751 RTD PT Use of any other value causes an Execution Error lt terminals gt 2 2 terminal 4 4 terminal Specification of terminals is necessary when the function type is OHMS or when an RTD temperature measurement is being defined When this field is called for a value must be supplied or a Command Error is generated Defining a 4 terminal channel 1 through 10 automatically sets the additional channel 11 through 20 to OFF If a value is supplied in this field when it is not necessary a Command Error is generated An Execution Error is generated if values other than 2 or 4 are used FUNC Channel Function Query Return the function for the indicated channel FUNC channel lt channel gt 0 20 If the channel indicated is invalid an Execution Error is generated For valid channels two or three comma separated data fields are returned One of the following function definitions is returned in the first data field TEMP VAC VDC OHMS FREQ OFF For a 4 terminal configuration two channels are used For the lower channel the instrument responds to FUN
46. Baud Rate OUTPUT Printer Parity Even 0 Odd None Memory Echo J On Off Mode All Data l IEEE 488 Alarm Data Address Alarm Transition Data TRIGGERS Off O External l Monitor Alarm Ch Totalizer Debounce ll On Off Input Name Alarm Alarm Output Output 18 4 20 e 2 2 wire accuracy 4 4 terminal resistance test A AC signal cross talk in a dc voltage channel D 1 AC signal cross talk into a frequency channel D 2 AC signal cross talk into an ac voltage channel D 2 AC signal cross talk into an ohms channel D 2 AC signal crosstalk into a temperature channel D 3 Accuracy verification test Advanced trigger mechanisms 5 3 Alarm indications 3 10 Alarm limits Autoprint computer interface control 4 5 output format 4 5 Autoprint and memory storage 68 232 4 5 B Both external and monitor alarms disabled type 0 5 4 Cabling the instrument to a host or printer RS 232 Calibration Changing the temperature unit 3 16 Channel configuration 3 4 Index Channel integrity test Character deletion Character echoing Cleaning 6 3 Clearing memory 4 7 Common mode 8 Computer interface trigger control
47. Figure 3 2 5 Close the module cover secure the screws and put the module back in the instrument Operating the Instrument from the Front Panel Measurement Connections 2 WIRE 2T CONNECTION 11 12 13 14 15 16 17 18 19 20 SOURCE HL HL 4 WIRE C SENSE 4 WIRE RESISTANCE OR RTD SOURCE USE H AND L TERMINALS FOR ANY CHANNEL CHANNEL 0 ON FRONT PANEL CHANNELS 1 THROUGH 20 ON REAR PANEL INPUT MODULE CHANNEL 8 SHOWN HERB 4 WIRE 4T CONNECTION 11 12 13 14 15 16 17 18 19 20 SOURCE 4 WIRE SENSE 4 WIRE RESISTANCE OR RTD SOURCE USE H AND L TERMINALS FOR TWO CHANNELS ON REAR PANEL INPUT MODULE CONNECTIONS FOR CHANNEL 8 SHOWN HERE WITH CHANNEL 18 PROVIDING ADDITIONAL TWO CONNECTIONS FOR EACH 4 WIRE CONNECTION ONE SENSE CHANNEL 1 THROUGH 10 AND ONE SOURCE CHANNEL SENSE CHANNEL NUMBER 10 11 THROUGH 20 ARE USED 0009 Figure 3 3 2 Terminal 4 Terminal Connections 3 21 2620A 2625A Users Manual 3 22 Totalizing General Event counting totalizing is commonly used on production lines for counting items The instrument counts events by detecting low to high voltage transitions each low to high transition increments the totalizer value by one The maximum count is 65535 OL for overload is displayed when the count exceeds this limit Connections The totalizing input is m
48. Importeurs Hiermit wird bescheinigt daB Fluke Model 2620A Data Acquisition Unit and 2625A Data Logger in bereinstimung mit den Bestimmungen der BMPT AmtsblVfg 243 1991 funk entst rt ist Der vorschriftsm Bige Betrieb mancher Ger te z B MeBsender kann allerdings gewissen Einschr nkungen unterliegen Beachten Sie deshalb die Hinweise in der Bedienungsanleitung Dem Bundesamt f r Zulassungen in der Telekcommunikation wurde das Inverkehrbringen dieses Ger tes angezeigt und die Berechtigung zur berpr fung der Seire auf Einhaltung der Bestimmungen eingeraumt Fluke Corporation viii Safety Terms in this Manual This instrument has been designed and tested in accordance with IEC publication 1010 Safety Requirements for Electrical Measuring control and Laboratory Equipment This Users Manual contains information warnings and cautions that must be followed to ensure safe operation and to maintain the instrument in a safe condition Use of this equipment in a manner not specified herein may impair the protection provided by the equipment The meter is designed for IEC 664 Installation Category II use It is not designed for use in circuits rated over 4800VA Warning statements identify conditions or practices that could result in personal injury or loss of life Caution statements identify conditions or practices that could result in damage to equipment Symbols Marked on Equipment 4 Danger High voltage IE Ground
49. Instrument Table 2 1 Display Annunciators MON Indicates that the Monitor function is enabled SCAN Indicates that the Scan function is enabled Scanning can be enabled as a single scan SINGLE se with a scan interval with an alarm triggered scan or as an externally triggered scan CH Indicates that the channel number is displayed immediately above in the right display SET Lit when the instrument is in Configuration Mode Mx B Lit while Mx B scaling is being defined and when a measurement on the display has been scaled with an M value other than 1 and or a B value other than 0 Also dimly lit when in the Inactive Mode to indicate that M value other than 1 and or a B value other than 0 has been defined for this channel FUNC Lit when a measurement function is being defined for this channel ALARM Lit when alarm values are being defined for this channel or when an alarm limit has been exceeded while measuring V Indicates that the measurement function is volts for this channel used with the AC or DC annunciator DC Indicates that the measurement function is dc voltage for this channel AC Indicates that the measurement function is ac voltage for this channel Q Indicates that the measurement function is resistance for this channel Hz Indicates that the measurement function is frequency for this channel Indicates that the measurement function is temperature for this channel and that the degree unit is Ce
50. PINS KEY O FEMALE DCD DATA CARRIER DETECT Rx RECEIVE Tx TRANSMIT DTR DATA TERMINAL READY GND GROUND DSR DATA SET READY RTS REQUEST TO SEND CTS CLEAR TO SEND RI RING INDICATOR MALE 0073f eps Figure F 2 Hydra DB 9 to PC DB 9 RS 232 Connection Generic 2620A 2625A Users Manual PINS FEMALE MALE RS40 CABLE OR EQUAL KEY Tx TRANSMIT Rx RECEIVE RTS REQUEST TO SEND CTS CLEAR TO SEND DSR DATA SET READY GND GROUND DCD DATA CARRIER DETECT DTR DATA TERMINAL READY RI RING INDICATOR O OO O O OPO O OOO O O OOO O O OPOP O O OO Figure F 3 Hydra DB 9 to PC DB 25 RS 232 Connection 0074f eps Appendices RS 232 Cabling RS41 CABLE OR EQUAL MODEM 10 20 gt Tx 3O0 L 4 Rx 4 gt RTS 5 lt CTS 6 lt DSR HYDRA 70 GND er O 8O DCD Rx 4 1 92 90 Tx gt 7 3 100 DTR 04 O GND 5 120 DSR 6 O 130 RTS gt 7 O 140 CTS 8 O 150 eo O 16O 170 RS 232C DB 9 18 190 200 DTR 210 220 lt RI PINS KEY 230 FEMALE Tx TRANSMIT SOS 240 E P FN TO SEND CTS CLEAR TO SEND DSR DATA SET READY GND GROUND DCD DATA CARRIER DETECT DATA TERMINAL READY RI RING INDICATOR DB 25 0
51. PRINT 1 FUNC STRS I CMDS GOSUB 800 NEXT I LOCATE 23 1 PRINT Measuring CMDS 7 Print to screen FOR I 1 TO 3 Scan 3 times PRINT 1 TRG Start a single GOSUB 800 Get prompt PRINT 1 SCAN TIME GOSUB 800 Get scan time stamp LINE INPUT 1 RESULTSS PRINT 2 RESULTS save time stamp in data file FOR J 1 NUMBEROFCHANS Request scan data PRINT 1 LAST STRS J Request channel data GOSUB 800 Get prompt INPUT 1 RESULTS Get channel result LOCATE J 3 25 PRINT Chan STRS I PRINT RESULTS Print results to screen PRINT 2 RESULTS Print results to file NEXT J PRINT 2 NEXT WEND Subroutine response Checks prompt for errors The possible command responses are gt CR LF command successful 7 2 gt CR LF command syntax error f gt CR LF Command execution error PROMPT INPUT 4 1 Get prompt IF INSTR 1 PROMPT gt lt gt 0 THEN RETURN Command successful IF INSTR 1 PROMPT IF INSTR 1 PROMPT gt lt gt 0 THEN PRINT Command Syntax Error i gt lt gt 0 THEN PRINT Command Execution Error PRINT Program execution halted due to communication errors END Figure 4 2 Sample Program cont 2620A 2625A Users Manual Table 4 2 IEEE 488 1 Capabilities 5 14 LEO SR1 RL1 PPO DC1 CO E1 Capability SH1 and AH1 Descrip
52. Scan function takes measurements at the specified interval on all defined channels Pressing to activate the Scan function causes all defined channels to be measured in sequence This cycle repeats at the specified scan interval When is pressed a second time the Scan function is turned off and the instrument returns to the Inactive Mode Note During a scan a channel set up with autoranging will momentarily slow the scanning rate whenever the correct range must be determined This will occur during the initial scan the instrument remembers the range for subsequent scans Scans then occur at the normal measurement rate If the input signal later changes sufficiently the scanning rate will again slow momentarily while the instrument determines the new range If scanning is deactivated while the instrument is actually taking scan measurements the display changes immediately but the full scan is still completed The instrument always completes a scan in progress You can also trigger a single scan of all defined channels Select SINGLE to scan all the defined channels once Reviewing Channel Data The instrument automatically stores minimum maximum and last scanned values for each defined channel These values are stored in the Review array and are updated with each set of scan measurements Measurements taken by the Monitor function are not included in the Review array The contents of the Review array can be calle
53. This query is valid during scanning The remaining count of stored scans LOG COUNT is decremented by 1 Channels defined as OFF are not included If there are no more logged scans or if the instrument is a Hydra Data Acquisition Unit an Execution Error is generated The response includes the following information Date and time at the start of the logged scan Date and time are returned as integer values For example returned values of 20 32 44 5 18 90 signify May 18 1990 20 32 44 Values for the channels measured The measurement data is returned as a list of scientific notation values separated by commas For example 3 4567E 3 4 9876E 6 are valid measurement values If the fast measurement rate is used the values have one less digit of resolution 3 457E 3 4 988E 6 If you are using the RS 232 interface format 2 valid data responses would include 894 45E 3 OHM 9 1234E 3 C State of the Digital I O lines and totalize count at the end of the scan Two values are returned The first is an integer in the range 0 through 15 identifying the four alarm output states The second is an integer in the range 0 through 255 identifying digital I O line states 4 35 2620A 2625A Users Manual Table 4 8 Command and Query Reference cont The Totalizer count is returned as a scientific notation value in the range 0 through 65535 00 000E 3 through 65 535E 3 If the Totalizer has overflowed a value
54. Use amp J or 4 to move between digits Use or V to select a value for each digit Accept your choice Channel configuration is complete the instrument returns to Configuration Mode 2 13 2620A 2625A Users Manual Note Any old alarm status limits Review array values or scaling parameters are automatically cleared whenever you change a channel s function Setting Alarm Limits and Mx B Scaling Values Alarm limits and Mx B scaling values are set in a manner very similar to that used for the channel function Begin by pressing either of the following buttons To begin alarm limits settings for this channel To begin scaling value settings for this channel The setup sequences are briefly discussed below Refer to Chapter 3 for more details about these and other instrument parameters Alarm Limits The menu for setting alarm limits allows you to set up both setpoints and B After choosing a setpoint the following settings must be made e The alarm sense HI LO or OFF e limit value sign and number e The decimal point location e The value multiplier m x1 k M Use W 4 and amp J to cycle through the selections at each setting Then press to accept your choice and move on to the next setting For example to set a high limit of 5 35 for alarm channel 7 do the following 1 Select channel 7 by pressing or 2 Press to begin alarm setting for channel 7 LIMIT
55. and for alarm limit 1 now appear in the display Press to accept that you are setting up alarm limit 1 Use the arrow buttons to select HI Then press ENR 4 Now use the arrow buttons again to set 53500 Press CO or to move between digits Press or to select the value for each digit Ignore the decimal point Press to accept these digits 5 Use the arrow buttons to select the decimal point position 5 3500 Then press to accept this position 6 Next use the arrow buttons again to select the multiplier x1 Press to accept this multiplier and save alarm limit 1 7 Limiti for channel 7 is now set for a high value of 5 35 Continue pressing to step through alarm limit 2 and return to the Inactive Mode Or press to immediately return to the Inactive Mode Pressing while partway through setting limit undoes any changes entered thus far for limit El returning the instrument to Inactive Mode Pressing W while partway through setting limit B cancels entries made thus far for limit B but does not affect any changes already made to limit 1 Overview Setting the Scan Interval Mx B Scaling The menu for setting Mx B scaling values takes you through the following steps e Set the M value sign and number e Set the decimal point location for the M value e Set the multiplier for the M value m x1 e Set the B value sign and number e Set the decimal point location
56. and the instrument can be calibrated by an automated instrumentation system The instrument should normally be calibrated on a regular cycle typically every 90 days or 1 year The chosen calibration cycle depends on the accuracy specification you wish to maintain The instrument should also be calibrated if it fails the performance test or has undergone repair Note Do not press CAL ENABLE unless you have a copy of the Service Manual and intend to calibrate the instrument If you have activated calibration and wish to exit calibration press CAL ENABLE until CAL disappears from the display or press power OFF Refer to the Hydra Series II Service Manual for the essential calibration procedures Variations in the Display Note This feature is not available with instruments having Main Firmware version 5 5 Under normal operation the display presents various combinations of brightly and dimly lit annunciators and digits However you may encounter other random irregularities across different areas of the display under the following circumstances e After prolonged periods of displaying the same information Ifthe display has not been used for a prolonged period This phenomenon can be cleared by activating the entire display and leaving it on overnight or at least for several hours Use the following procedure to keep the display fully lit 1 With power OFF press and hold SHIFT then press power ON 2 Wait a moment fo
57. debounce disabled Autoprint OFF Memory Storage 2625A only OFF empty RTD RO parameter 100 00 all channels Open Thermocouple Detection OTC enabled Note During a scan a channel set up with autoranging will momentarily slow the scanning rate whenever the correct range must be determined This will occur during the initial scan with the instrument remembering the range for subsequent scans Scans then occur at the normal measurement rate If the input signal later changes sufficiently the scanning rate will again slow momentarily while the instrument determines the new range AC voltage measurements can be made over a wide range of frequencies The instrument s true rms converter insures accuracy for both sine wave and non sine wave signals Refer to Chapter 5 for additional information about true rms measurements Resistance measurements can be made to determine either resistance or the value of another directly related parameter Slide wire potentiometers thermistors and other sensors with variable resistance outputs are often used to indicate temperature position and other physical parameters The instrument measures resistance by passing a current 3 5 2620A 2625A Users Manual through both a known resistance and the sensed resistance The resulting voltages are measured and appropriate conversions are applied to the measurement yielding a displayed output in ohms Frequency is measured by counting cycles f
58. elements Section 8 1 C 3 2620A 2625A Users Manual 4 11 12 13 14 15 16 17 18 19 20 21 There are device to device messages The size of any block data responses Section 8 7 9 4 There are no block data responses A list of common commands and queries which are implemented Section 10 CLS ESE ESE ESR IDN OPC OPC RST SRE SRE STB TRG TST WAI A description of the state of the device after successful completion of the Calibration query Section 10 2 The CAL command not implemented an optional command The maximum length of the block used to define the trigger macro if DDT is implemented Section 10 4 DDT is not implemented The maximum length of macro labels the maximum length of the block used to define a macro and how recursion is handled during macro expansion if the macro commands are implemented Section 10 7 Macros are not implemented A description of the response to the identification common query IDN Section 10 14 The IDN query returns FLUKE 2620A 0 M2 41 7 DI 3 The version number of the main software is M2 41 A3 7 is the version number of the analog sub system software and D1 3 is the version number of the display sub system software The size of the protected user data storage area PUD Section 10 27 PUD not implemented There is no protected user data storage area The size of
59. for the B value e Set the multiplier for the B value m x1 M Use Y 4 and gt to cycle through the selections at each step Then press to accept your choice and advance to the next step For example to set an M value of 1 8 and a B value of 32 for channel 7 do the following 1 Select channel 7 by pressing or 2 Press to begin Mx B scaling setting for channel 7 3 Use the arrow buttons to select 18000 Press 4 to move between digits Press V to select the value for each digit Ignore the decimal point Press to accept these digits 4 Use the arrow buttons to select the decimal point position 1 8000 Then press to accept this position 5 Next use the arrow buttons again to select the multiplier x1 Press to accept this multiplier Use the arrow buttons to select 00320 Then press Ener ENTER Use the arrow buttons to select the decimal point position 0032 0 Then press to accept this position 8 Next use the arrow buttons again to select the multiplier x1 Press to accept this multiplier as the multiplier for the B value scaling is now set at 1 8x 32 for channel 7 Pressing while partway through setting the M value undoes all changes entered thus far returning the instrument to Inactive Mode Pressing Y while partway through setting the B value cancels entries made thus far for the B value but does not affect any changes a
60. in the Instrument Event Register are described in Table 4 6 Whenever the Instrument Event Register is read the instrument bits are cleared 4 21 2620A 2625A Users Manual Table 4 6 Instrument Event Register IER Note Whenever the Instrument Event Register is read the condition bits are cleared This register is used in conjunction with the Instrument Event Enable Register to determine the conditions under which the Instrument Event Bit of the Status Byte is set Bit Name Description 0 ALT Alarm Limit Transition Set high 1 when any measurement value has transitioned into or out of alarm Alarms are defined through the front panel or the computer interface ALARM_LIMIT This bit is cleared when alarms or review values are cleared 1 TOB Totalize Overflow Set high 1 when the Totalizer overflows gt 65 535 This bit is cleared when the Totalizer is zeroed from the front panel or set to some other non overflow value lt 65 535 with the computer interface TOTAL command 2 OTC Open Thermocouple Set high 1 when open thermocouple checking is enabled and any thermocouple channel is measured with a source impedance greater than 1 to 4 kilohms 3 CCB Calibration Corrupted Set high 1 when the instrument calibration data is corrupted When a calibration data check shows a corruption of calibration data the calibration alarm bit remains set in the Instrument Status Register until the instrument is recalibrated
61. instrument e g an isolated thermocouple probe where the thermocouple junction is electrically isolated from shield two additional configurations to try are 2620A 2625A Users Manual 1 Connect the shield to L low at the 2620A 100 Input Module and try connecting the sensor shield to a quiet earth ground at or very near the measurement sensor end and at only one place or 2 Connect the shield to L low at the Input Module and try connecting the shield to earth ground only as close to the rear of the instrument as possible Isolated and shielded sensors will likely result in the best instrument measurement performance possible in a noisy environment In More Detail If a low noise configuration is required adhering to the following two rules minimizes measurement errors and noise when using shielded sensors and wiring 1 Connect the shield so that it and the L low terminal are at the same or very nearly the same voltage and 2 Connect the shield so that common mode voltages will not cause current to flow through the L or H source resistance s One key to applying these rules is to note that very high but finite impedances exist between H high and L low between H and earth ground and between L and earth ground inside the instrument Chapter 6 Maintenance enter LEID Line RUSE E dec Self Test Diagnostics and Error
62. is on along with other annunciators indicating the parameter being set Configuration Mode is summarized in Figure 3 1 Inactive Mode The instrument is in Inactive Mode when no measurement functions are enabled and no instrument settings are being changed This is a quiescent mode from which Active or Configuration Mode can be entered The display presents summary information identifying the channel number brightly lit right display and its present function dimly lit annunciator Configuration Mode Start from Inactive Mode For full configuration sequence descriptions refer to the appropriate description in Section 3 or 4 Exit any configuration sequence early and discard changes by pressing ee Define a measurement function for this channel Set alarm parameters for a defined channel Set scaling and offset parameters for this defined channel Set time interval between scans Select scan triggering type TRIGS INTVL Set date and time CLOCK Select measurement rate RATE Select autoprint memory storage Set computer interface parameters COMM Figure 3 1 Configuration Mode 2620A 2625A Users Manual Other Displayed Data An array of MIN and LAST values for each channel is updated whenever scan measurements are taken This Review array can be displayed from Active or Inactive but not Configuration Mode by pressing eve The constantly updated Totalizer count can also be displayed
63. lt CR gt Assure output 0 measures a LOW state DO_LEVEL 1 0 lt CR gt Assure output 1 measures LOW state DO_LEVEL 2 0 lt CR gt Assure output 2 measures a LOW state Repeat the command for all eight outputs 7 Set up Hydra Series II to turn Digital Outputs OFF HIGH state In sequence send the following commands to Hydra Series II and measure that the correct Digital Output line transitioned HIGH measures greater than 3 8V dc DO_LEVEL 0 1 lt CR gt Assure output 0 measures a HIGH state DO_LEVEL 1 1 lt lt CR gt gt Assure output 1 measures a HIGH state Repeat the command for all eight outputs Digital Input Test 1 Perform the DIGITAL OUTPUT TEST steps 1 through 5 2 Using either a terminal or a computer running a terminal emulation program set up Hydra Series II to read the Digital Input lines Send the following command to Hydra Series II DIO_LEVELS lt CR gt Maintenance Performance Tests 6 Verify that the returned value as shown on the Host screen 255 Note The number returned is the decimal equivalent of the Digital Input binary word inputs 0 through 7 status See Table 6 7 to determine if the number returned corresponds to the bits jumpered to ground in this test 3 Jumper input 0 to ground by connecting the ground test lead to input 0 test lead Then send the following command to Hydra Series II DIO_LEVELS lt CR gt Verify that the returned value as shown on the Host screen
64. of 1E 9 is returned An Execution Error is generated if this query is used with the IEEE 488 interface The following example shows the type of data received in response to LOG The first line shows time and date The second line shows measurement values The third line shows alarm outputs state DIO state and totalizer value Note that the actual response combines all this information on one line three lines are shown here for presentation clarity 16 15 30 10 3 90 034 53E 3 09 433E 0 09 433E 0 09 434E 0 09 434E 0 15 255 00 000E 3 LOGGED Retrieve specified scan data from memory RS 232 only LOGGED lt index gt lt index gt 1 2047 Scan data is not removed from memory with this query Use of lt index gt values outside the range causes an Execution Error Use of lt index gt values within the range and have no data stored will also cause an Execution Error An Execution Error is generated if the instrument is a Hydra Data Acquisition Unit Scan data is returned in the same format as for the LOG query LOG_BIN Binary Upload of Logged Data RS 232 only For quick upload of logged data from a 2625A See Appendix E An Execution Error is generated if the instrument is a Hydra Data Acquisition Unit or lt index gt is out of range or invalid LOG_BIN lt index gt LOG_CLR Clear Logged Scans RS 232 only Clear all stored scan data An Execution Error is generated if the instrument is a Hydra Data A
65. or 100 mV dc channels 440 ms for slow rate scanning DCV ACV ohms and frequency only 890 ms for slow rate scanning any thermocouple or 100 mV dc channels Repeatability 3 ms for the Specified Conditions above A 13 2620A 2625A Users Manual A 14 Digital and Alarm Outputs Output Logic Levels Logical zero 0 8V max for an Iout of 1 0 mA ILSTTL load Logical one 3 8V min for an Iout of 0 05 mA 11 5 load For non TTL loads 1 8V max for an Iout or 20 mA Logical zero 3 25 max for an Iout of 50 mA Isolation none Real Time Clock and Calendar Accuracy Within 1 minute per month for 0 C to 50 C range Battery Life 10 years minimum for Operating Temperature range Environmental Warmup Time 1 hour to rated specifications 15 minutes when relative humidity is kept below the rated maximum minus 20 e g below 70 for a 90 maximum rating Operating Temperature 0 to 60 C Storage Temperature 40 C to 75 C Instrument storage at temperature extremes may necessitate adding up to 0 008 to the and ac voltage accuracy specifications Alternatively any resulting shift can be compensated for by recalibrating the instrument Relative Humidity Non Condensing 90 maximum for 0 C to 28 C 75 maximum for 28 C to 35 C 50 maximum for 35 C to 50 C 35 maximum for 50 C to 60 C Except 70 maximum for 0 C to 35 C 30 maximum for 40 C to 50 C and 20 maximum fo
66. parallel with 150 pF maximum for all ranges and below 10 in parallel with 100 pF maximum for the 30V and 300V ranges Normal Mode Rejection 53 dB minimum at 60 Hz 0 1 slow rate 47 dB minimum at 50 Hz 0 1 slow rate Common Mode Rejection 120 dB minimum at dc 1 imbalance slow rate 120 dB minimum at 50 or 60 Hz 0 1 1 imbalance slow rate Maximum Input 300V or ac rms on any range for channels 0 1 and 11 150V dc or ac rms for channels 2 to 10 and 12 to 20 Cross Talk Rejection Refer to Appendix D Appendices A Specifications Thermocouple Inputs Temperature Measurements Accuracy Thermocouples IPTS 68 Thermocouple Accuracy C 18 C to 28 C 0 TO 60 C Type Temperatur 90 Days 1 Year 1 Year 1 Year 1 Year Slow Slow Fast Slow Fast 100 to 30 0 43 0 44 0 91 0 55 1 09 J 30 to 150 0 38 0 40 0 81 0 58 1 02 150 to 760 0 43 0 47 0 92 0 87 1 36 100 to 25 0 52 0 53 1 13 0 65 1 31 K 25 to 120 0 43 0 45 0 94 0 63 1 17 120 to 1000 0 60 0 67 1 37 1 27 2 02 1000 to 1372 0 98 1 08 1 96 1 94 2 88 100 to 25 0 62 0 63 1 43 0 74 1 60 N 25 to 120 0 52 0 54 1 21 0 66 1 38 120 to 410 0 46 0 48 1 07 0 68 1 27 410 to 1300 0 66 0 73 1 47 1 40 2 18 100 to 25 0 45 0 46 0 91 0 58 1 09 E 25 to 350 0 38 0 39 0 77 0 62 0 99 350 to 650 0 39 0 43 0 82 0 80 1 22 650 to 1000 0 49 0 55 1 04 1 10 1 63 150 to 0 0 68 0 69 1 49 0 82 1 71 T 0 to 120 0 45 0 46 0 95 0 59
67. plug and jack at each end Shielded IEEE 488 two meter cable with plug and jack at each end Shielded 488 four meter cable with plug and jack at each end Binding post to BNC plug 10Q Precision Resistor metal film 1 1 8 watt 100 ppm For use with 4 20 mA signals Where to go From Here You might want take a minute to familiarize yourself with this manual Glance through the table of contents at the front to see the overall layout of the manual and the major parts of the instrument If you have questions about specific topics the Index at the end of the manual will be useful Or just fan through the headers at the top of each page each header reveals the chapter number and the chief subject for that page The chapters are summarized in the following paragraphs 2620A 2625A Users Manual 1 6 Getting Started Provides a quick introduction to instrument setup and operation Chapter 1 Introduction Describes standard features options and accessories for the Fluke Hydra Series Data Acquisition Unit and Hydra Series II Data Logger Also this chapter discusses the organization and intended uses of this manual Chapter 2 Overview Brings the instrument from its shipping container to operating status This chapter provides brief descriptions and a quick walk through of instrument operation Read this chapter to gain a feel for instrument use But please don t avoid reading Chapter 3 for in depth operatio
68. the display Table 3 15 illustrates how to examine the Review array contents Operating the Instrument from the Front Panel List Button Functions Table 3 15 Review Array Activate Note 1 Review Points Note 3 9 20 LAST MIN MAX or Deactivate 0 LAST MIN MAX CLEAR This clearing action can be initiated only while viewing the Review values Any scan in progress is completed before a requested Review clear is carried out Review values are cleared when any channel configuration is changed Review values are not cleared automatically at the start of a new scan Note 3 When returning to Inactive Mode the instrument returns to the last channel examined in the Review array This may not be the same channel from which you started viewing the Review array Note 4 Alarms are shown with the LAST Review values See Alarm Indications for a description of alarm annunciation All review values for all channels are cleared with any of the following actions e CLEAR Gt is selected This must be done while review data is on the display otherwise an error beep results e Function or number of terminals for any channel is changed e Range or thermocouple RTD type for any channel is changed e The M and or B scaling value for any channel is changed e The RTD RO value for any channel is changed e The temperature unit is changed e The measurement rate is changed List Button Function
69. the resource description if the RDT command or RDT query are implemented Sections 10 30 and 10 31 The RDT and RDT commands are not implemented A description of the states affected by RST Section 10 32 LRN Section 10 17 RCL Section 10 29 and SAV Section 10 33 RST restores the device to the state assumed at initial power up except for those items specifically forbidden by the RST command definition The initial power up state is defined under item 4 above LRN and SAV are not implemented A description of the scope of the self test performed by the TST query Section 10 38 TST performs the tests listed under TST in Table 4 8 of the User s Manual The device reverts to the power up state after performing these tests A description of additional status data structures used in the device s status reporting Section 11 The Instrument Event Enable IEE register and the Instrument Event Register IER are described in Figure 4 4 Appendices C IEEE 488 2 Devise Documentation Requirements 22 For each command a statement describing whether is overlapped or sequential All commands are sequential none are overlapped 23 For each command the device documentation shall specify the functional criteria that are met when an operation complete message is generated in response to that command Section 12 8 3 Operation complete is generated when the command is parsed C 5
70. the various elements of the Review Array All other front panel buttons are locked out yielding a long beep when pressed Press both and again to deactivate the Review Only function and return the instrument to normal front panel button operation regular Review Array display e LOCK 2 and can now be used to change the monitored channel All other front panel buttons are locked out a long beep results from their use Refer to Chapter 4 for additional information on these commands REM Annunciator The front panel REM annunciator identifies the status of both computer interface control and front panel lockout REM may be lit due to actions taken from the computer interface or the front panel it can be off dim or bright as shown in Table 3 19 Table 3 19 REM Annunciation Remote Lock REM Annunciation False False Off False True Dim True False Bright True True Dim Calibration Refer to Chapter 6 Maintenance of this manual for a general discussion of instrument calibration Refer to the Hydra Series II Service Manual P N 688868 for complete calibration procedures The CAL ENABLE control point is located in the lower right corner of the display When the instrument is correctly calibrated this control should be covered with a calibration decal removing the decal voids assurance of correct calibration Note Do not press CAL ENABLE unless you have a copy of the Service Manual and intend to calibrate the
71. value s for channels measured in the most recent scan The value returned represents data from the most recent scan The most recent scan is the scan in progress or if scanning is not in progress the last completed scan MAX channel channel 0 20 Leave the channel specification field blank if values for all defined channels are desired An Execution Error results if a request is made for a channel defined as OFF the channel specified is invalid the channel specified has been set up but not yet measured or Review array values have been cleared The response is a signed number with decimal point and exponent For slow scanning rate 5 digits are returned XX XXXE X for fast scanning rate 4 digits are returned XX XXE X The range setting determines placement of the decimal point For maximum values of all defined channels no channel specification made undefined OFF channels are not included For each defined channel a separate signed number with decimal point and exponent is returned Commas separate numbers for different channels and no blank spaces are included 4 37 2620A 2625A Users Manual 4 38 Table 4 8 Command and Query Reference cont MIN Channel s Minimum Value Returns minimum value s for channels measured in the most recent scan The value returned represents data from the most recent scan The most recent scan is the scan in progress or if scanning is not in
72. 0 0 031 20 mQ 0 03196 0 2 Q 3 kQ 0 015 0 2 Q 0 016 0 2 Q 0 016 2 Q 0 039 0 2 Q 0 039 2 Q 30 kQ 0 013 2 Q 0 014 2 Q 0 014 20 Q 0 039 2 Q 0 039 20 Q 300 0 020 20 Q 0 021 20 Q 0 021 200 Q 0 050 20 Q 0 050 200 Q 3 MQ 0 059 200 Q 0 063 200 Q 0 063 2 KQ 0 231 200 Q 0 231 2 KQ 10 MQ 0 168 2 KQ 0 169 2 KQ 0 709 20 kQ 0 573 2 KQ 0 923 20 kQ 2 Wire Accuracy Add 4 0Q to accuracy specifications for channels 1 to 20 and add 20 mQ for channel 0 Lead wire resistances are not included Input Protection 300V or ac rms on all ranges Cross Talk Rejection Refer to Appendix D 2620A 2625A Users Manual Frequency Inputs Frequency Range 15 Hz to greater than 1 Mhz Range Resolution Accuracy Hz Slow Fast Slow Fast 15 Hz 900 Hz 0 01 Hz 0 1 Hz 0 05 0 02 Hz 0 05 0 2 Hz 9 kHz 0 1 Hz 1 Hz 0 05 0 1 Hz 0 05 1 Hz 90 kHz 1 Hz 10 Hz 0 05 1 Hz 0 05 10 Hz 900 kHz 10 Hz 100 Hz 0 05 10 Hz 0 05 100 Hz 1 MHz 100 Hz 1 kHz 0 05 100 Hz 0 05 1 kHz Sensitivity Frequency Level Sine Wave 15 Hz 100 kHz 100 mV rms 100 kHz 300 kHz 150 mV rms 300 kHz 1 MHz 2Vrms Above 1 MHz Not specified Maximum AC Input 300V rms or 424V peak on channels 0 1 and 11 150V rms or 212V peak on channels 2 to 10 and 12 to 20 Voltage ratings between channels must not be exceeded 2 x 10
73. 007f eps Figure F 4 Hydra DB 9 to Modem DB 25 RS 232 Connection 5 2620A 2625A Users Manual RS42 CABLE OR EQUAL PRINTER Rx RTS CTS DSR HYDRA GND e O e DCD Rx 2 e Tx O DTR 4 O GND 5 DSR 6 O RTS 7 CTS 8 O O RS 232C DB 9 DTR e e RI PINS KEY O FEMALE Tx TRANSMIT e Rx RECEIVE RTS REQUEST TO SEND CTS CLEAR TO SEND DSR DATA SET READY GND GROUND DCD DATA CARRIER DETECT DATA TERMINAL READY RI RING INDICATOR DB 25 0076f eps Figure F 5 Hydra DB 9 to Printer DB 25 RS 232 Connection Appendices RS 232 Cabling SOLDER CONNECTOR SIDE SIDE MALE FEMALE CONNECTOR SOLDER SIDE SIDE CONNECTOR 13 12 11 10 9 8 7 65 4 3 2 1 SOLDER CONNECTOR SIDE ecu OUO OO OG SIDE 2472 20 4918 1716 15 44 FEMALE 1 2 3 4 5 6 7 8 9 10 11 12 13 CONNECTOR SOLDER SIDE 0 00 0 0 0 0 070 SIDE 4 15 16 17 18 19 20 21 22 23 24 25 DB 25 CONNECTOR 0077f eps Figure F 6 RS 232 DB9 and DB 25 Connectors F 7 2620A 2625A Users Manual F 8 Hydra Configuration Record SET UP NAME DATE SCAN RATE 0 Slow TEMPERATURE UNITS IF Fast COMMUNICATION I F 0 RS 232 C SCAN INTERVAL 2
74. 15 16 17 18 19 20 Appropriate channels are OR ed to drive each I O line All Digital I O lines are set high non active whenever power is cycled These lines remain high until a new scan detects an alarm condition on an assigned limit or until a new Computer Interface command is received Note Measurements taken with the Monitor function do not affect the digital outputs At the completion of a scan an alarm condition sets the assigned digital output to a logic 0 low state The digital output returns to a logic 1 high state when all assigned alarm conditions are cleared Note that digital outputs for alarms are updated only at the end of each scan This technique prevents unnecessary toggling of the digital lines during a scan Mx B Scaling Any analog input channel 0 through 20 can be assigned scaling M and B values that are applied to subsequent measurements of that channel Scaling values can be set via the front panel or over a computer interface The M value is used as a multiplier of the actual reading the B value is then added in the same units as the resultant If no scaling values are specified for a channel the Configuration Reset values of 1 and 0 are used leaving the measurement reading unaltered In the Inactive Mode the Mx B annunciator lights to indicate that an M value other than 1 and or value other than has been specified for the displayed
75. 17 could provide the two pairs of terminals This second channel provides the necessary two additional terminals and is therefore not available for any other use until the first channel is changed to a function other than 4 terminal OHMS or RTD A 4 terminal configuration is illustrated in Figure 5 2 True RMS Measurements The instrument measures the true rms value of ac voltages In physical terms the rms root mean square value of a waveform is the equivalent dc value that causes the same amount of heat to be dissipated in a resistor True rms measurement greatly simplifies the analysis of complex ac signals Since the rms value is the dc equivalent of the original waveform it provides a reliable basis for comparing dissimilar waveforms Effects of Internal Noise in AC Measurements With the input shorted and the instrument set for ac volts VAC measurement internal amplifier noise causes a typical display reading of approximately 0 50 mV Since the instrument is a true rms responding measurement device this noise contributes minimally to the reading at the specified floor of each range When the rms value of the two signals internal noise and range floor is calculated the effect of the noise is shown as V total rms digits 0 50 15 00 15 008 The display will read 15 01 At the 28 00 mV input level on the 300 00 mV range in the slow rate the display will read 28 00 with no observable error Waveform Comparison True R
76. 2620A 2625A Users Manual C 6 Appendix D Making Mixed Measurements Introduction This appendix augments the discussion of ac signal effects on other channels cross talk found in Chapter 5 Making Mixed Measurements Effects on each measurement function are discussed below These numbers should only be considered as references Since cross talk can be introduced into a measurement system in many places each setup must be considered individually The effect of cross talk could be much better than shown for Typical in extreme cases the effect could be worse than the Worst Case numbers In general the Worst Case information assumes that none of the guidelines for minimizing cross talk Chapter 5 have been followed the Typical information assumes that the guidelines have been followed where reasonable These numbers assume that input L low is tied to earth ground refer to Using Shielded Wiring in Chapter 5 For dc volts and thermocouple temperature measurements a source impedance of 1 in series with the high input is assumed except where otherwise noted Signal Cross Talk ina DC Voltage Channel VDC DCV Error Ratio CTRR POETEN VACrms Worst case Typical 50 60 Hz 0 1 1 1 x 107 2 0 x 10 Other Frequencies 3 8 x 10 8 6 x 10 For example to find the typical effect of a 300V ac signal at 60 Hz on another channel for the 300 mV range you would calculate 300 x 2 0 x 10 0 01 mV D 1
77. Binary Upload of Logged Data LOG BIN 2625A only 1 5 232 TEE nmonou Index List of Tables Table Title 1 1 Hydra Fe tures 1i ese terns ri etre 1 22 ACCESSES ACE 2 1 Display Anmunciatots nee 2 2 Front Panel Pushbuttons nennen nenne 2 3 Review icy 3 1 Configuration Reset 3 2 DC Voltage AC Voltages n naat awqan EE CH Ee rae HET ee Reda 3 3 EE 2 4 uq 3 5 Thermocouple Temperature enne enne ener enne 3 6 RID Lemjperature cid ert ena ee o EE Ee Eee 3 1 Alarm Selection 3 8 Initial Alarm Assignments Digital I O Lines 4 Through 7 3 9 _ MX B Select Onis 3 10 Scan Interval EM 3 11 Measurement Rate 3 12 Trigger Typ Selection 3 13 Date Time Select iska 3 14 Thermocouple Ranges tena ope ERAC bL cere trea 3 15 REVIEW 3 16 List Button Oper ti n rires erre 3 17 Autoprint Memory Storage Selection sese 3 18 C
78. C architecture Inputs lt src Array of binary data from LOG_BIN query length Number of bytes src array d e Outputs Bor timestamp Set to decimal timestamp values EE misc Set to temp units rate and digital I O values values Set to floating point values found in binary data must be room for maximum of 22 floats void convert src length unsigned char src int length int n Convert timestamp from BCD to decimal for 0 lt 6 srct t Binary Coded Decimal BCD format packs the upper nibble as the unsigned char m src 4 tens digit the lower nibble as the ones digit Convert this into an integer number timestamp n 10 src gt gt 4 src amp 0x0f Save temperature units measurement rate and digital I O values for 0 lt 3 misc n srctt Convert raw measurement data into floating point m unsigned char values for length 9 length gt 3 length 4 ifdef sun SunOS architecture also works for Motorola CPUs m src 0 m src 1 m src 2 mtt src 3 Assume Intel x86 architecture m src 3 m src 2 m src 1 m src 0 e Figure E 2 Floating Point Conversion 2620A 2625A Users Manual
79. C with OHMS or TEMP in the first field For the upper channel lower channel 10 the instrument responds with OFF in the first field The second data field indicates the range when a function has been chosen If the channel is set up to autorange AUTO is returned If the function is TEMP the thermocouple RTD type is returned in this field If the function is OFF there is no range data returned If the type is OHMS or RTD temperature a third field is included to indicate the number of terminals used See the Channel Function Definition FUNC command for a definition of the data returned for the range and number of terminals fields IEE Instrument Event Enable Sets the Instrument Event Enable Register to the given value IEE value value 0 255 This is a mask for the Instrument Event Register and is the first step in determining which conditions may issue an SRQ The mask selects which conditions may set the Instrument Event Bit of the Status Byte If the value is not in the range 0 to 255 an Execution Error is generated 4 33 2620A 2625A Users Manual 4 34 Table 4 8 Command and Query Reference cont IEE Instrument Event Enable Query Returns the present value of the Instrument Event Enable Register as an integer IER Instrument Event Register Query Returns the value of the Instrument Event Register as an integer then clears all bits INTVL Set Scan Interval
80. DC LIMIT OFF PRN Li L4 d oon Lo CAL EXT TR REVIEW SCAN SINGLE jiwa 2710 TRIGS Pow E INPUT TERMINALS Channel 0 2 DISPLAY See Figures 2 3 2 4 and 2 5 3 ACTIVE MODE BUTTONS SINGLE HFT seus 4 POWER BUTTON 5 PRINT COMMUNICATIONS BUTTONS MODE SHIFT COMM SHIFT usr LOCAL SHIFT INSTRUMENT CONFIGURATION BUTTONS TRIGS WON INTVL RATE Gat 5 CLOCK ere Figure 2 2 Front Panel 7 OTHER BUTTONS These buttons are used to both configure and operate the instrument Gar CHANNEL CONFIGURATION BUTTONS FUNC ALRM Mx B 0002f eps 2 5 2620A 2625A Users Manual 2 6 REVIEW MAX REM SCAN SET FUNC ji LAST MIN AUTO MON Mx B ALARM I SCSPRO PI suos Limit Hi OFF P TEN uos 10 CAL Figure 2 3 Left Display REVIEW MAX REM SCAN SET FUNC Wt jui ia dv LAST MIN AUTO MON Mx B ALARM I Et It I mx C F ZA ZA ZA OZA l OFE PRN CH gg Lo CAL EXT TR Figure 2 4 Right Display REVIEW MAX REM SCAN SET FUNC LAST MIN AUTO Mx B ALARM F RO I mV ACDC LIMIT T guo LO Figure 2 5 Annunciators 0003f eps 0004f eps oo05f eps Overview Setting Up the
81. DIO 255TOTAL 0 The Hydra Series II Data Logger can hold 2047 scans with each scan containing 21 channels of data Table 3 16 List Button Operation 3 24 Note1 Note 2 Note 3 Press these buttons A To select from these LASt choices StorE Note 1 RS 232 computer interface must be active If the IEEE 488 interface is active an error results Note 2 LASt prints out all values in the Review array Review array values are not affected An error results if Review array data has been cleared StorE prints out logged scan data from the Hydra Data Logger 2620A memory Logged data is not affected An error results if there is no logged data Note 3 Press to abort a printout while it is occurring Operating the Instrument from the Front Panel Autoprint Autoprint The front panel setup procedure is summarized in Table 3 17 Begin this procedure by selecting MODE Select the scan data destination dESt in right display as Print left display For the Hydra Series II Data Logger a destination of both can also be selected allowing for simultaneous printing and storage For the Hydra Series II Data Acquisition Unit Print is the only possible selection Then select the mode MOde in right display from ALL or trAnS left display With the Autoprint function defined press to enable or disable Autoprint The PRN annunciator lights when Autoprint is e
82. Digital Output Level Set or clear the indicated digital output DO LEVEL DO line DO state DO line 0 7 DO state 1 0 If the digital output line requested is not in the range 0 through 7 an Execution Error is generated If the DO_state specified is not 1 high or 0 low an Execution Error is generated Low is the active alarm state At power up all digital outputs are set high ECHO Enable Disable RS 232 Echo Mode RS 232 only ECHO lt 1 0 gt 1 Turn RS 232 echoing on 0 Turn RS 232 echoing off If the IEEE 488 interface is selected use of ECHO results in an execution error FORMAT Response Format Set the output format type FORMAT lt f_type gt lt f_type gt 1 2 The default is 1 which is IEEE 488 2 compatible Since no measurement units are allowed in IEEE an alternative 2 is provided When format 2 is in effect the responses are no longer IEEE 488 2 compatible The primary use for format 2 is with RS 232 as it provides a means of recording the units with the measurement value Any parameter other than 1 or 2 causes an Execution Error to be generated The units strings used are as follows 4 31 2620A 2625A Users Manual 4 32 Table 4 8 Command and Query Reference cont MEASUREMENT UNITS STRING Scaled MX B Volts DC VDC Volts AC VAC Resistance OHMS Frequency Hz Temperature SEA FORMAT Query Response F
83. E 488 system must be the lesser of 20 meters or 2 meters times the number of devices in the system With an IEEE 488 interface installed and active the instrument 2620A 05 or Hydra Series II with 2620A 05K supports the IEEE 488 capabilities shown in Table 4 2 Installing the IEEE 488 Interface The following instructions pertain to the 2620A 05 Data Acquisition Unit or a Hydra Series II Data Acquisition Unit equipped with a 2620A 05K IEEE 488 Kit A standard IEEE 488 cable attaches to the instrument rear panel The following cables are available from Fluke Y8021 1 meter Y8022 2 meter and Y8023 4 meter Select COMM to check the interface setting If IEEE is displayed the 488 interface is already installed and selected If a numeric baud rate appears in the left display the RS 232 interface is selected press W so that IEEE is displayed then press exter Enen select the address and press again 4 9 2620A 2625A Users Manual 4 10 EXAMPLE BAS Hydra program to scan VDC VAC OHMS FREQ or TEMP initialize 5232 communication and set up Hydra d display and record measurement data in TESTDATA PRN Hydra must be set up for RS232 9600 baud no parity from front panel KEY OFF Open communications port 9600 baud no parity 8 bit data ignor Clear to Send Data Set Ready Carrier Detect OPEN COM1 9600 N 8 cs ds cd FOR RANDOM AS 1
84. E 6 Summary of RS 232 Connections n nre nennen Hydra DB 9 to PC DB 9 RS 232 Connection Generic Hydra DB 9 to PC DB 25 RS 232 Connection Hydra DB 9 to Modem DB 25 RS 232 Connection Hydra DB 9 to Printer DB 25 RS 232 Connection RS 232 DB9 and DB 25 Caution THIS IS AN IEC SAFETY CLASS 1 PRODUCT BEFORE USING THE GROUND WIRE IN THE LINE CORD OR THE REAR PANEL BINDING POST MUST BE CONNECTED FOR SAFETY Interference Information This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer s instructions may cause interference to radio and television reception It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications of Part 15 of FCC Rules which are designed to provide reasonable protection against such interference in a residential installation Operation is subject to the following two conditions e This device may not cause harmful interference e This device must accept any interference received including interference that may cause undesired operation There is no guarantee that interference will not occur in a particular installation If thi
85. EEE 488 are not changed Also the Status Byte and Event Status Registers are not changed and calibration data is retained Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont SRE Service Request Enable Sets the Service Request Enable Register to the given value SRE value value 0 255 If the value is greater than 255 a Command Error is generated The value of bit 6 is ignored since it is not used by the Service Request Enable Register SRE Service Request Enable Query Returns the integer value of the Service Request Enable Register with bit 6 set to O STB Read Status Byte Query Returns the integer value of the Status Byte with bit 6 as the master summary bit Note that a serial poll returns bit 6 as the RQS message TRG Trigger When parsed this command causes the instrument to request a Single Scan If a scan is already in progress when this command is parsed an additional scan is not executed TST Self Test Query Causes an internal self test to be run returning the result as an integer representing the binary encoded value The self test does not require any local operator interaction and returns the instrument to the power up state The binary coding is Bit Binary Value Error 0 1 ROM test failed bad CRS 1 2 External RAM test failed 2 4 Internal RAM test failed 3 8 Display selft test failed 4 16 Display bad or not i
86. F indicating the sense of that limit For HI or LO limits the value is returned in scientific notation format with five digits of resolution If the channel specified is invalid or the requested limit is not 1 or 2 an Execution Error is generated Remember that old alarm settings for a channel are lost when the function for that channel is changed DATE Set Date Set instrument calendar values DATE lt month gt lt date gt lt year gt month 1 12 date 1 31 year 00 99 Invalid values generate an Execution Error Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont DIO_LEVELS Digital State Query Returns digital input and output levels for the eight configurable digital I O lines Returns an integer value representing the actual states of the digital I O lines The low order eight bits are used to indicate the status of each configurable I O line 0 indicates low 1 indicates high Bits 0 through 7 correspond to lines 0 through 7 The highest possible integer value is 255 indicating that all eight digital I O lines are set high NOTE The digital I O line levels returned by the DIO LEVELS query may not match the levels set with the DO LEVEL command Lines that were set to 1 high may have been externally driven low The DIO LEVELS query causes the actual state of the lines to be read DO LEVEL Set
87. FLLIKE 2620A 2625A Hydra Series Data Acquisition Unit Hydra Series Data Logger Users Manual PN 686675 November 1997 1997 Fluke Corporation All rights reserved Printed in U S A All product names are trademarks of their respective companies LIMITED WARRANTY amp LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is one year and begins on the date of shipment Parts product repairs and services are warranted for 90 days This warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any product which in Fluke s opinion has been misused altered neglected or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Fluke does not warrant that software will be error free or operate without interruption Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international pri
88. GITAL RS 232C MEETS 0871B COMPLIES FCC 15B DTR RX SH1 AH1 T5 L4 SR1 RL1 DC1 DT1 PPO CO E1 GND I TX 0 12378v 123456754 V A 00000 EXTERNAL BATTERY WARNING If voltages greater than 30V are to be measured a safety ground must be attached to the rear panel ground connector when the instrument is operated from battery power oo06f eps Figure 2 6 Rear View Overview Operating Modes Input Channels The instrument provides one input channel 0 on the front panel and 20 inputs channels 1 20 through a connector on the rear panel Channels 0 1 and 11 can measure maximum of 300V all other channels can measure a maximum of 150 Caution The maximum input that can be applied between any terminal of channels 2 10 and 12 20 is 150V dc or ac rms The maximum input that can be applied between any terminal of channels 0 1 and 11 and ground is 300V dc or ac rms The maximum common mode input that can be applied is 300V dc or ac rms Operating Modes The instrument provides three modes of operation Active Mode The instrument is in Active Mode whenever the Monitor and or Scan functions are enabled Scans are activated by the interval timer an external trigger an alarm trigger or a single scan SINGLE command When in Active Mode the MON and or SCAN annunciators are lighted Configuration Mode The instrument is in Configuration Mode wheneve
89. Globals convert uses for destination int timestamp 6 Scan timestamp int misc 3 Temperature units measurement rate digital I O float values 22 Measurement values extern int isnan Floating point value is NaN not a number extern int isinf Floating point value is Inf infinity main LOG BIN query response example program Converts a hard coded LOG BIN response string into usable data extern int decode extern void convert ASCII to binary decoding Convert Hydra binary to usable types Canned response for three channels channel 1 is OTC channel 5 is OL and channel 10 is 1 0 remaining encoded data described below E note that you can not determine the channel number measurement units or measurement range from this string you must keep track of that elsewhere char log_bin_response 426Y40BA0000000007000010P000 h000 Place to temporarily store raw data 100 bytes is more than enough for any LOG_BIN response string unsigned char raw_data 100 Decode string into raw data then convert raw data into usable data convert raw_data decode raw_data log_bin_response Above global variables now usable check example LOG_BIN data against expected values if timestamp 0 10 amp amp Hours timestamp 1 24 amp amp Minutes timestamp 2 9
90. H high and L low terminals of channel 1 For 4 terminal performance testing connect a second pair of test leads to the H high and L low terminals of channel 11 Install the Input Module back into the instrument 3 Connect channel 1 s test leads to the Output HI and LO terminals of the Decade Resistance Source For 4 terminal performance testing also connect channel 11 s test leads to the Output HI and LO terminals of the Decade Resistance Source Connect as shown in Figure 6 3 Note 4 terminal connections are made using pairs of channels 4 terminal measurements can only be made on channels 1 through 10 The accompanying pairs are channels 11 through 20 4 Switch the instrument ON 5 Select the 4 terminal RTD temperature function RTD type PT for channel 1 on the Hydra Series II Instrument Press MON and ensure the display reads between the minimum and maximum values shown on Table 6 5 6 The RTD Temperature Accuracy test is complete However if you desire to perform this test on Input Module channels 2 through 10 repeat steps 1 through 5 substituting in the appropriate channel number Note The only type of temperature measurement that can be made on channel 0 is 2 terminal RTD Channels 11 through 20 will support only 2 terminal RTD s Table 6 5 Performance Tests for RTD Temperature Function Resistance DIN IEC 751 Amendment 1 IPTS 68 DECADE RESISTANCE TEMPERATURE SIMULATED TEMPERATURE ACCURACY
91. IAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA WHETHER ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT TORT RELIANCE OR ANY OTHER THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court of competent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Fluke Europe B V P O Box 9090 P O Box 1186 Everett WA 98206 9090 5602 BD Eindhoven U S A The Netherlands 5 94 Table of Contents Chapter Title 1 I iYOductiom UL The Hydra Series II Data Acquisition The Hydra Series II Data Logger Options and ee Applications SoftWate eee n reete eed E EA IEEE 488 Interface Assembly eene Connector Set 2620 100 aisia JACCOSSODI S uQ ama haha tee Where t go From ie rte Deed ame ead 2 OVeIVIGW Setting Up the Unpacking and Inspecting t
92. MS vs Average Responding 5 8 Figure 5 3 illustrates the relationship between ac and dc components for common waveforms and compares readings for true rms measurements such as with the instrument and average responding measurements For example consider the first waveform a 1 41421V zero to peak sine wave Both the instrument and rms calibrated Additional Considerations 5 Making Mixed Measurements average responding measurement devices display the correct rms reading of 1 0000V the dc component equals 0 However consider the 2V peak to peak square wave Both types of measurement correctly display the dc component OV but the instrument also correctly measures the ac component 1 0000V The average responding device measures 1 111 which amounts to an 11 error Average responding measurement devices have been in use for a long time you may have accumulated test or reference data based on such instruments The conversion factors in Figure 5 3 can aid in converting between the two measurement methods Making Mixed Measurements With multiple channels Hydra Series II allows mixing of measurement types But the possibility of the ac signal on one channel affecting measurements on other channels must be considered This effect is known as cross talk The ac volts signal could be either a voltage that is to be measured on another channel which is known as a normal mode signal or an ac voltage signal on another channel th
93. NNEL 0 ON FRONT PANEL CHANNELS 1 THROUGH 20 ON REAR PANEL INPUT MODULE CHANNEL 8 SHOWN HERE 4 WIRE 4T CONNECTION 12 13 14 15 16 17 18 19 20 SOURCE HL 4 WIRE SENSE 4 WIRE RESISTANCE OR RTD SOURCE USE H AND L TERMINALS FOR TWO CHANNELS ON REAR PANEL INPUT MODULE CONNECTIONS FOR CHANNEL 8 SHOWN HERE WITH CHANNEL 18 PROVIDING ADDITIONAL TWO CONNECTIONS FOR EACH 4 WIRE CONNECTION ONE SENSE CHANNEL 1 THROUGH 10 AND ONE SOURCE CHANNEL SENSE CHANNEL NUMBER 10 11 THROUGH 20 ARE USED 0016f eps Figure 5 2 2T and 4T Connections 5 7 2620A 2625A Users Manual Table 5 1 Ohms Test Voltage Range Typical Full Scale Voltage 300 00 Q 0 22 3 0000 kQ 0 25 30 000 0 29 300 00 0 68 3 0000 MQ 2 25 10 000 MQ 2 72 e 4 Terminal Configuration In 4 terminal configuration the instrument uses a second pair of leads to automatically eliminate measurement lead and internal relay resistance errors With measurement lead and internal relay resistances eliminated this configuration yields the most accurate readings Four terminal measurements are allowed on channels 1 through 10 only However two pairs of high H and low L terminals are needed for this type of measurement The first pair is provided by the selected channel any of channels 1 through 10 The second pair is provided by the channel 10 numbers higher For example channels 2 and 12 or 7 and
94. Note PRESS A A THESE BUTTONS m TO OFF J SELECT 1 V DC K Completes FROM V AC E Selection and THESE Q T returns to CHOICES Hz N Inactive Mode 20 C or F R S b C Pt Note The nine thermocouple choices and related temperature measurement ranges are J Type J 210 to 760 C K Type K 270 to 1372 C E Type E 270 to 1000 C 270 to 400 N 270 to 1300 C R 0 to 1767 5 0 to 1767 b Type B 0 to 1820 C no Type C 0 to 2316 C Tungsten 5 Rhenium vs Tungsten 26 Rhenium Pt selects RTD temperature measurement DIN IEC 751 See Table 3 6 Hoskins Engineering Co 3 8 Operating the Instrument from the Front Panel Channel Configuration Table 3 6 RTD Temperature RO Channel Function Type Ice Point Note 1 Note 2 Note 3 PRESS THESE Func v BUTTONS 02 m LA m TO 0 OFF J 2T 100 00 Completes SELECT 1 VDC K 4T selection FROM VAC E and returns THESE 2 Q to Inactive CHOICES Hz N Mode 20 C or F R 5 b Pt Note 1 Pt selects RTD temperature measurement DIN IEC 751 See Table 3 5 for J T S b and C thermocouple selections Note 2 4T not available on channels 0 and 11 through 20 Note 3 RO default is 100 000 A unique RO value can be set for each cha
95. OTAL lt t_value gt i value 0 65535 If the value is not in the range 0 through 65 535 an Execution Error is generated Clear the Totalizer count by setting the Totalizer to zero 0 TOTAL Totalizer Value Query Returns the value of the present Totalizer count Format of the value is 00 000E 3 When the Totalizer has overflowed the value returned is 001 00E 9 TOTAL_DBNC Set Totalizing Debounce Set totalizing input debounce state TOTAL_DBNC lt dbnc_state gt lt dbnc_state gt 1 on 0 off Use of any other value causes an Execution Error to be generated At initial power up totalize debounce is disabled 0 TOTAL DBNC Totalizer Debounce Query Returns the totalizing input s debounce state as an integer When disabled the response is 0 indicating debounce is not in use When enabled the response is 1 indicating debounce is being used TRIGGER Select Trigger Type Select the type of scan triggering TRIGGER trig type trig type 0 off 1 2 alarm Off 0 signifies that external triggering is disabled Only normal scan interval triggering can be used If the scan interval is 0 continuous scanning results On 1 means that external triggering is enabled An acceptable low input on the External Trigger input TR terminal on the rear panel then affects scanning as follows If the instrument is in Inactive Mode or Monitor Mode the low input enables scanning When the TR in
96. P p F 1 47 2 79 4F 95 111 1111 RUB 51 us UNL o M WNT o s OUT MSA31 23 22 21 29 ADDRESSED UNIVERSAL LISTEN TALK SECONDARY ADDRESSES COMMANDS COMMANDS ADDRESSES ADDRESSES OR COMMANDS decimal 38 hex KEY amp 1722A DISPLAY Ascu t e 277 0025f eps Appendix C IEEE 488 2 Devise Documentation Requirements Introduction Section 4 9 of the IEEE Standard 488 2 1987 states All devices shall supply information to the user about how the device has implemented this standard In this context device means the Fluke 2620A Hydra Series Data Acquisition Unit The Fluke Hydra Series Data Logger cannot be equipped for IEEE 488 operation The information in Appendix C is provided in compliance with this requirement Implementation of IEEE Standard 488 2 1987 Items 1 23 below correspond to the specific items of information required by Section 4 9 Device Documentation Requirements of the Standard The information supplied by Fluke in response is italicized Throughout Appendix C the word Section refers to the section s in the Standard not this manual 1 A list of IEEE 488 2 Interface Function subsets implemented Section 5 IEEE 468 1 interface functions implemented in the Fluke Data Acquisition Unit are listed under IEEE 488 capability codes Appendix A 2 description of device behavior when the address is set outside the range 0 30 Section 5 2 It is
97. RA ONLY Vac dcl 2 828 1 414 1 000 0 000 RECTIFIED SINE 1 414 FULL WAVE 1414 0 421 0 436 0 900 RECTIFIED SINE 2 000 HALF WAVE 2 000 0 779 0 771 fA 0 636 2 000 1 111 0 000 RECTIFIED 1 414 SQUARE jaa 7 0 785 0 707 0 707 2 000 2 000 4 442 2 TRIANGLE 3 464 SAWTOOTH 1 732 PK t 0 962 v 0 000 RMS CAL IS THE DISPLAYED VALUE FOR AVERAGE RESPONDING INSTRUMENTS THAT ARE CALIBRATED TO DISPLAY RMS FOR SINE WAVES 0017f eps Figure 5 3 Comparison of Common Waveforms 5 10 Additional Considerations 5 Using Shielded Wiring e Avoid connecting inputs with ac volts signals to any channel 10 numbers away from a sensitive channel i e 4 terminal input channels e Avoid tying L low or especially H high inputs of a sensitive channel to earth chassis ground This is very important in resistance measurements e Avoid high source impedances on sensitive channels or minimize the capacitance of the sensitive channel to earth chassis ground for high impedance inputs e Whenever high ohms measurements gt 10 kQ must be made accurately avoid connecting any inputs carrying ac volts signals to the Hydra Series I instrument Note If frequencies other than 50 or 60 Hz must be present on other channels while measuring resistance temperature or dc voltage frequencies of 40 Hz multiples of 80 Hz 40 120 200 etc up to 2 kHz should be avoided Otherwise frequencies at int
98. Request Enable Register using the SRE command EXAMPLE EXPLANATION SRE 16Enables the generation of an SRQ when bit 4 MAV in the Status Byte Register STB is set to 1 16 is the decimal equivalent of 00010000 binary This means that bit 4 in the Service Request Enable Register SRE which corresponds to the MAV bit in the Status ByteRegister is 1 and all other bits are 0 SRE 48 Enables the generation of an SRQ when bits 4 or 5 or ESB in the Status Byte Register are set to 1 The binary equivalent of 48 is 00110000 indicating that bits 4 and 5 are set to 1 If any bit in the SRE is set to 1 and the matching bit s in the STB become 1 the RQS bit bit 6 in the Status Byte Register STB is set and a service request can be generated Use the SRE query to read the Service Request Enable Register The instrument returns a binary weighted integer that represents the enabled bits in the register The value of bit 6 will always be zero Convert the returned value to binary to determine the status of register bits EXAMPLE EXPLANATION SRE Reads the value of the SRE Register Assume 4 is returned Converting 4 to the binary 00000100 indicates that bit 2 in the SRE is set to 1 Instrument Event Register The Instrument Event Register IER is used in conjunction with the Instrument Event Enable Register IEE to determine the conditions under which the Instrument Event Bit of the Status Byte Register is set Bits used
99. Set the 5700A to output 90 mV DC Send the following command MON VAL CR The value returned should now be 90 mV 0 028 mV between 89 972 and 90 028 mV Change Hydra Series II s channel 0 function to the internal dc range by redefining channel 0 Send the following commands MON 0 lt CR gt FUNC 0 VDC I1V CR Set the 5700A to output 0 9V dc Send the following commands MON 1 0 lt CR gt MON_VAL lt CR gt The value returned should be 900 mV 0 21 mV 899 79 to 900 21 mV 4 Terminal Resistance Test Assure Channel 0 s Accuracy Verification Test for DC Volts and Resistance meets minimum acceptable levels 1 2 Switch OFF power to the instrument and disconnect all high voltage inputs Remove the Input Module from the rear of the instrument Open the Input Module and connect a pair of test leads keep as short as possible to the H high and L low terminals of channel 1 and a second pair of test leads to the and L terminals of channel 11 Install the Input Module back into the instrument Observing polarity connect channel 1 s test leads to the Sense HI and LO terminals of the 5700A and channel 11 s test leads to the Output HI and LO terminals of the 5700A Connect as shown in Figure 6 2 Switch the instrument ON Select the 4 terminal OHMS function AUTO range for channel 1 on the Hydra Series Instrument Set the 5700A to output the resistance values listed in Table 6 3 Use decades of 1 9
100. Use caution when handling the measurement source Wait for all measurement connections to reach thermal equilibrium Thermal voltages are generated only where there is a temperature gradient pomo I9 When Measuring Resistance or Temperature RTD 5 6 The instrument can measure a resistance with two or four terminal connections Advantages for each configuration are discussed below e 2 Terminal Configuration The instrument measures resistance in a 2 terminal configuration using a resistance ratio sometimes called ratio ohms technique Using only the high H and low L terminals for one channel 2 terminal resistance measurements are simple to set up and yield good results for many measurement conditions However if lead wire and internal relay resistances are significant in relation to the resistances being measured the 4 terminal configuration should be used Internal relay resistances are noted in Appendix A Specifications A 2 terminal configuration is illustrated in Figure 5 2 The full scale voltage for each resistance range is shown in Table 5 1 The or H input test lead is positive with respect to the COM or L lead Additional Considerations When Measuring Resistance or Temperature Rtd 2 WIRE 2T CONNECTION 11 12 13 14 15 16 17 18 19 20 SOURCE HL HL HL HL HL HL HL HL HL 4 WIRE SENSE 4 WIRE RESISTANCE OR RTD SOURCE USE H AND L TERMINALS FOR ANY CHANNEL CHA
101. ac no switching required 50 and 60 Hz 10 VA maximum 9V dc to 16V dc 10W maximum If both sources are applied simultaneously ac is used if it exceeds approximately 8 3 times dc Automatic switchover occurs between ac and dc without interruption At 120V ac the equivalent dc voltage is 14 5V Standards IEC 1010 1 ANSI ISA 582 01 1994 CSA C22 2 No 1010 1 92 and EN61010 1 1993 Complies with EN 50081 1 EN 50082 1 Vfg 243 199 and FCC 15B at the Class level when shielded cables are used RS 232 C Connector 9 pin male DB 9P Signals TX RX DTR GND Modem Control full duplex Baud rates 300 600 1200 2400 4800 and 9600 Data format 8 data bits no parity bit one stop bit or 7 data bits one parity bit odd or even one stop bit Flow control XON XOFF Echo on off 2625A Data Storage Stores 2047 scans Each scan includes Time stamp Readings for all defined analog input channels Status of the eight digital I O e e Totalizer count Memory is battery backed Memory life 5 years minimum at 25 C 2620A Options IEEE 488 Option 05k Capability codes SH1 T5 L4 SR1 DT1 LEO and CO Complies with IEEE 488 1 standard A 16 Appendix B ASCII amp IEEE 488 Bus Codes B 1 2620A 2625A Users Manual B 2 FLUKE ASCII amp BUS CODES 7 5 Bits P NUMBERS Bs po CONTROL SYMBOLS UPPER CASE LOWER E 40 80
102. acy an additional 11 C for channels 1 to 20 and 0 05 C for channel 0 Maximum Current Through Sensor 1 mA Typical Full Scale Voltage 0 22 Maximum Open Circuit Voltage 3 2 Maximum Sensor Temperature 600 C nominal 999 99 F max displayed Cross talk Rejection Refer to Appendix D AC Voltage Inputs Range Resolution Slow Fast 300 mV 10 uV 100 uV 3V 100 uV 1 mV 30 V 1 mV 10 mV 300 V 10 mV 100 mV Minimum Input For Rated Accuracy 20 mV 200 mV 2V 20 V Appendices A Specifications 1 Year Accuracy V Range Frequency 18 C to 28 C 0 C to 60 C Slow Fast Slow Fast 20 Hz 50 Hz 1 43 0 25 mV 1 43 0 4 mV 1 54 0 25 mV 1 54 0 4 mV 50 Hz 100 Hz 0 30 0 25 mV 0 30 0 4 mV 0 41 0 25 mV 0 41 0 4 mV 300 100 Hz 10 kHz 0 16 0 25 mV 0 16 0 4 mV 0 27 0 25 mV 0 27 0 4 mV 10 kHz 20 kHz 0 37 0 25 mV 0 37 0 4 mV 0 68 0 25 mV 0 68 0 4 20 kHz 50 kHz 1 9 0 30 mV 1 9 0 5 mV 3 0 0 30 mV 3 0 0 5 mV 50 kHz 100 kHz 5 0 0 50 mV 5 0 1 0 mV 7 0 0 50 mV 7 0 1 0 mV 20 Hz 50 Hz 1 42 2 5 mV 1 42 4 1 53 2 5 mV 1 53 4 mV 50 Hz 100 Hz 0 29 2 5 mV 0 29 4 mV 0 40 2 5 mV 0 40 4 mV 3V 100 Hz 10 kHz 0 13 2 5 mV 0 13 4 mV 0 24 2 5 mV 0 24 4 mV 10 kHz 20 kHz 0 22 2 5 mV 0 22 4 mV 0 35 2 5 mV 0 35
103. ade at the input labeled Z sigma on the rear panel Digital I O Connector see Figure 3 4 This input accepts a minimum input of 2 0V pk which translates to 1 4V rms for a sinewave rms for a square wave If the input is contact closure type input debouncing of 300 Hz 1 67 ms is available A maximum rate of 5 kHz can be accommodated through the totalizing input but only if the input debouncing is disabled Input debounce settings are available only through the computer interface see Chapter 4 ALARM OUTPUTS DIGITAL I O 30V 1 Figure 3 4 Totalizing Connection 2 3 TR QUEEN CE 0010f eps Review Array Readings from every scan are checked for minimum and maximum values These values along with the last value measured are stored in the Review array and can be recalled by pressing evew To cycle through the three values for the displayed channel press lt or gt If no value has been stored or if the value has just been cleared the display shows dashes These values are updated by all scans scan intervals continuous scans single scans or scans initiated with an external trigger input Measurements taken with the Monitor function do not update these values Note that either the Review array or the Totalizer count can be displayed at one time you must deactivate one before activating the other Press a second time or press to remove Review data from
104. al Front Panel Review Only Front Panel Monitor Only Computer Interface Initiated Lockouts REM Annunclatot sa uu destruere e rer ee Lee utet edere dete eg evt de Cal Drath estas vias qasasqa sassa 3 2 Operating the Instrument from the Front Panel Introduction Introduction Chapter 3 describes how to use the instrument features that were introduced in Chapter 2 The introductory information in Chapter 2 is designed to give you a feel for the instrument s controls and display The information presented here in Chapter 3 adds more detail about connecting and operating the instrument Operating Modes The instrument has three modes of operation These modes are summarized as follows Active Mode The instrument is in Active Mode whenever the Monitor and or Scan functions are enabled MON and or SCAN annunciators are lighted as appropriate Note that the Scan function can be activated by the scan interval timer external trigger alarm trigger or a single scan command e Configuration Mode The instrument is in Configuration Mode whenever any of the settings are being examined or changed Examples of Configuration Mode are channel function selection alarm value setting Mx B scaling value setting scan interval setting and trigger type selection During Configuration Mode the SET annunciator
105. an be triggered via the RS 232 interface or the IEEE 488 interface by sending the TRG command Note that the IEEE 488 interface GET command can be used only when the IEEE 488 interface is enabled Note If the instrument is in the remote state without front panel lockout i e REMS be generated from the front panel by pressing aN Both External and Monitor Alarms Disabled Type 0 External trigger input is disabled Front Panel OFF Computer Interface TRIGGER 0 The TRG and GET commands can still be used and only normal scan interval triggering can be used If the scan interval is 0 00 00 continuous scanning results Also a small scan interval specifying a time less than that required by the instrument to complete a full scan effectively becomes continuous scanning The number of channels in the scan and the types of measurement determine the time necessary to complete one scan External Trigger Enabled Type 1 5 4 This corresponds to the Front Panel ON or Computer Interface TRIGGER 1 setting When External Trigger is enabled a low signal on the rear panel TR terminal affects scanning as follows e Ifthe scan function has already been activated the trigger signal causes a single set of scan measurements to be taken This feature is convenient in cases where you want to collect normal scheduled scans as well as scan measurements in response to some abnormal situation When the condition arises a trigger s
106. an trigger is controlled by scan interval ON External triggering is enabled A low input on the rear panel TR terminal affects scanning as follows If the instrument is in Inactive Mode or just the Monitor Function is on the low input enables scanning When the signal on the TR terminal returns to high scanning is disabled If scanning is already enabled the external trigger initiates a single scan If a scan is already in progress this request is ignored ALAr An alarm condition on the monitor channel automatically triggers a scan External triggering is disabled External Triggering The external trigger setting offers additional control of scan starts through a separate trigger line on the rear panel Refer to Chapter 5 for an in depth discussion of external triggering Changing the Temperature Unit The displayed temperature unit can be degrees Celsius C or Fahrenheit F To switch this setting start with the instrument powered off then press and hold while pressing POWER ON After the instrument beeps and the new temperature unit is shown in the display release The units setting can also be changed through the Computer Interface with the TEMP CONFIG command refer to Chapter 4 3 16 Operating the Instrument from the Front Panel Measurement Connections Setting Date and Time of Day The instrument features a built in battery maintained clock and calendar Verify or change the settings u
107. ast Slow Fast 200 00 002 006 048 0 07 0 49 0 00 0 02 0 1 0 09 0 09 0 55 0 13 0 59 100 00 0 02 0 1 0 10 0 11 0 58 0 17 0 64 300 00 0 02 0 1 0 14 0 14 0 65 0 24 0 75 600 00 0 02 0 1 0 19 0 20 0 76 0 37 0 93 Sensor inaccuracies are not included IEC 751 Amendment 1 100 Platinum ITS 90 RTD 4 Wire Accuracy C Temperature Resolution 18 C to 28 C 0 C to 60 C C Slow 90 Day 1 1 Year 1 1 Slow Slow Fast Slow Fast 200 00 0 02 0 1 0 06 0 06 0 48 0 07 0 49 0 00 0 02 0 1 0 09 0 09 0 55 0 13 0 59 100 00 0 02 0 1 0 13 0 13 0 60 0 19 0 67 300 00 0 02 0 1 0 17 0 18 0 69 0 28 0 79 600 00 0 02 0 1 0 30 0 31 0 87 0 48 1 04 Sensor inaccuracies are not included A 5 2620A 2625A Users Manual A 6 IEC 751 Amendment 2 100 Platinum ITS 90 RTD 4 Wire C Temperature Resolution 18 C to 28 C 0 C to 60 C C Slow Fast 90 Day 1 Year 1 Year 1 Year 1 Year Slow Slow Fast Slow Fast 200 00 0 02 0 1 0 13 0 13 0 54 0 13 0 55 0 00 0 02 0 1 0 09 0 09 0 55 0 13 0 59 100 00 0 02 0 1 0 12 0 12 0 59 0 18 0 66 300 00 0 02 0 1 0 23 0 24 0 74 0 34 0 85 600 00 0 02 0 1 0 55 0 56 1 12 0 73 1 29 Sensor inaccuracies are not included 2 Wire Accuracy For 2 wire sensors with R 1000 degrade accuracy by 5 0 C per lead ohm plus degrade accur
108. at is present between the channel inputs and earth ground which is known as a common mode signal A common mode signal could occur for example if an unshielded thermocouple were to be used to measure the metal case temperature of an ac power line diode AC voltage cross talk can affect the various measurement types differently It can cause other ac voltage measurements to read too high DC and resistance OHMS measurements could either shift or read noisy Frequency measurements could be noisy or in the extreme case the cross talk frequency could actually become the measured signal Cross talk can occur at numerous places in the device or process being monitored in the wiring to the Hydra Series II instrument or within the Hydra Series II instrument itself Fortunately precautions can be taken to provide error free measurements by minimizing the effects of cross talk Use the following guidelines to minimize cross talk between ac volts signal inputs and other sensitive channels e Keep any input wiring carrying ac volts signals physically separate from other sensitive channel s input wiring e Avoid connecting inputs with ac volts signals adjacent to sensitive channel inputs Leave unconnected channels between the inputs if possible 5 9 2620A 2625A Users Manual PEAK VOLTAGES ASE VOLTA VOLTAGES DC AND AC COUPLED ONLY DC TOTAL RMS PK PK COMPONENT TRUE RMS WAVEFORM RMS CAL HYD
109. atever mode it was in the last time power went off Normally it will go to Inactive Mode and sit idle with a channel number on the right hand display You can change the displayed channel with and Other annunciators are lit dimly to provide a summary description of the selected channel s setup The initial setup for all channels should be off as you scroll through the channels with or the OFF annunciator should be on dimly If any of the channels are set up otherwise or if the instrument immediately starts taking measurements after the self test sequence then it still contains the previous user s setup You can quickly get the instrument back to the initial setup by performing a Configuration Reset To perform a Configuration Reset press OFF Then hold in while pressing ON keep pressed until the self test sequence is finished and the instrument beeps one time Setting Up a Channel Press to select a channel to modify For this example start with channel 0 2 Press to access the function setup menu The SET and FUNC annunciators come on and the instrument goes into Configuration Mode The present function for this channel is also highlighted for 2620A 2625A Users Manual this example OFF is lit if you re working with channel 0 and have already performed the Configuration Reset 3 Press to cycle through the choices for measurement function For now sele
110. bits are the status of the alarm digital outputs 0 indicates line is low in alarm and 1 indicates line is high not in alarm These lowest four bits correspond to alarm digital outputs 0 through 3 which are permanently associated to channels 0 through 3 respectively A value of 15 indicates that all alarm outputs are in the non alarm high state 4 29 2620A 2625A Users Manual 4 30 Table 4 8 Command and Query Reference cont ALARM_LIMIT Set Alarm Limit Store alarm limit information for the indicated channel and limit The fields to be given in order are ALARM_LIMIT lt channel gt lt limit_num gt lt sense gt lt value gt lt channel gt 0 20 lt limit_num gt 1 2 lt sense gt HI LO OFF lt value gt Signed numeric quantity A Command Error is generated if a value is supplied when the sense is OFF An Execution Error is generated under any of the following circumstances lt value gt is outside the range 9999 9 Mega E 6 lt channel gt lt limit_num gt or lt sense gt are not specified from the given list A lt channel gt that is defined as OFF is specified Note that old alarm settings for a channel are lost when the function for that channel is changed ALARM LIMIT Alarm Limit Assignments Query Return alarm limit data for specified channel and limit ALARM LIMIT channel limit num channel 0 20 limit num 1 2 Returns HI LO or OF
111. ble Register to the given value ESE lt gt lt value gt 0 255 This is a mask for the Event Status Register and is the first step in determining which Events may issue an SRQ The mask selects which events may set the Instrument Event Bit of the Status Byte If the value is not in the range 0 to 255 an Execution Error is generated ESE Event Status Enable Query Returns an integer representing the present value of the Event Status Enable Register ESR Event Status Register Query First returns an integer representing the value of the Event Status Register then clears the register IDN Identification Query Returns the instrument identification code The identification code consists of four descriptive fields separated by commas Note that commas are reserved as field separators and cannot be used within the fields FIELD DESCRIPTION 1 Manufacturer s name FLUKE 2 Instrument model number 2620A or 2625 3 0 4 Firmware revision levels As an example for main software version M2 41 display software version D1 3 A D software version A3 7 the response would be FLUKE 2620A 0 M2 41 7 01 3 Operation Complete Causes the instrument to generate an Operation Complete when parsed OPC Operation Complete Query Causes the instrument to place an ASCII 1 in the output queue when parsed RST Reset Performs a Configuration Reset equals front panel power up CANCEL The computer interface parameters RS 232 and I
112. ce Fluke reserves the right to invoice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center or send the product with a description of the difficulty postage and insurance prepaid FOB Destination to the nearest Fluke authorized service center Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that the failure was caused by misuse alteration accident or abnormal condition of operation or handling Fluke will provide an estimate of repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FLUKE SHALL NOT BE LIABLE FOR ANY SPEC
113. channel When a measurement is displayed for a channel so configured no measurement units Q V etc are shown Note If you press for a channel that is OFF an error beep will result Always use to define the channel s measurement function before using to define the scaling values You can familiarize yourself with the Mx B setup procedure by pressing wes Then press a few times to cycle through the elements of the scaling values If only is pressed no changes are introduced Note that the scaling value element that can Operating the Instrument from the Front Panel Channel Configuration be changed at any point is brightly lit solid for digits flashing for other annunciators all other elements are dimly lit at this time Table 3 9 presents full description of the configuration sequence If you press while setting the M value anytime prior to showing the B value no changes entered thus far are stored If you press while setting the B value changes to are stored and changes to are discarded In either case the instrument returns to Inactive Mode The final press shown in Table 3 9 stores all changes and returns the instrument to Inactive Mode Note Once Mx B scaling values are defined for a channel the instrument uses the range chosen for the B value as the display range for the resulting scaled value If the result is larger than the display range chosen an overload OL is displayed
114. ck Mount Kitu eese een ener Settings ALAM Rm S orn Ec Alarm Indications nni em Er Ebene eir re Pe Ca eR eR laua Resetting Alarm Conditions eese nennen nennen Using the Digital VO Lines eene Scalig uoti ene s t ptt fades vies awd inii ee Ee IRE ea Instrument Configuration eese nennen nnnm Entering and Changing Numeric Values eene selecting Scan Interyal 3 eiae eet ener oreet tcp eras Selecting the Measurement Triggeri AO External TriS Seri gs Changing the Temperature Unit essere Setting Date and Time of Measurement Connections aiian DC Volts AC Volts Frequency and Thermocouples Resistance and bon pee Cr General Review List Button Functions 000 Memory Storage oii Front Panel Lock out Conditions eese Front Panel Review Only Function
115. cquisition Unit LOG_COUNT Logged Scan Count Query RS 232 only Return the number of stored scans Returns an integer value representing the number of scans presently stored in memory The maximum value that can be returned is 2047 0 indicates that there are no stored scans An Execution Error is generated if the instrument is a Hydra Data Acquisition Unit 4 36 Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont LOG_MODE Determines treatment of new scan data when memory is full RS 232 only LOG MODE lt gt 0 Wrap around When memory is full oldest scans are discarded to make room for new scans This is the default mode 1 Discard new scans New scans are stored only when memory becomes available See LOG and LOG CLR The LOG MODE setting is non volatile and cannot be changed from the instrument front panel An Execution Error is generated if the instrument is a Hydra Data Acquisition Unit LOG MODE Query treatment of new scan data when memory is full RS 232 only or 1 is returned signifying the mode set with the LOG MODE command An Execution Error is generated if the instrument is a Hydra Data Acquisition Unit LWLS Local with Lockout RS 232 only Enter the IEEE 488 1 local with front panel lockout LWLS state All front panel buttons are disabled The REM annunciator is not lit MAX Channel s Maximum Value Returns maximum
116. ct V AC to set up the channel for AC voltage measurements 4 Press to confirm your choice The instrument then offers a choice of measurement ranges for this function starting with Auto for autoranging 5 Press to cycle through the choices for range Select the 300v range 300v 15 available only on channels 0 1 and 11 6 Press to confirm your choice This completes setting up channel 0 to measure AC voltage The instrument returns to Inactive Mode and the new setup for channel 0 is shown dimly on the display The sequence for setting up a channel to measure DC Voltage Frequency or Resistance is very similar 1 Press V to select a channel to set up 2 Press to access the function setup menu 3 Press to cycle through the choices for measurement function then press emen 4 Press V to cycle through the choices for range then press This completes the setup for the channel and the instrument returns to Inactive Mode When you set up a channel to measure resistance the instrument also lets you choose 2 Terminal or 4 Terminal measurements 2T or 4T before returning to Inactive Mode Note that 4 Terminal measurements are supported only on channels 1 10 The sequence for setting up a channel to measure temperature is similar 1 Press V to select a channel to set up 2 Press to access the function setup menu 3 Press V to select C
117. ctor Error Non sinusoidal input signals with crest factors between 2 and 3 and pulse widths 100 us and longer add 0 246 to the accuracy specifications Common Mode Rejection 80 dB minimum at 50 or 60 Hz 0 1 1 kQ imbalance slow rate Maximum AC Input 300V rms or 424V peak on channels 0 1 and 11 150V rms or 212V peak on channels 2 to 10 and 12 to 20 Voltage ratings between channels must not be exceeded 2 x 10 Volt Hertz product on any range normal mode input 1 x 10 Volt Hertz product on any range common mode input DC Component Error SCAN and first MONitor measurements will be incorrect if the dc signal component exceeds 60 counts in slow rate or 10 counts in fast rate To measure ac with a dc component present MONitor the input and wait 5 seconds before recording the measurement Cross Talk Rejection Refer to Appendix D Appendices Specifications A Ohms Inputs Maximum Range Resolution Typical Full Current Maximum Open Through Slow Fast Scale Voltage Unknown Circuit Voltage 300 Q 10 mO 010 0 22 V 1 3 2V 3 kQ 010 10 0 25V 110 HA 1 5V 30 10 100 0 29 V 13 1 5 V 300 kQ 100 100 Q 0 68 V 3 2 3 2V 3 MQ 100 Q 1 kO 2 25 V 3 2 3 2V 10 MQ 1 10 2 72 V 3 2 WA 3 2V 4 Wire Accuracy 0 Range 18 C to 28 C 0 C to 60 C 90 Days Slow 1 Year Slow 1 Year Fast 1 Year Slow 1 Year Fast 300 Q 0 01396 20 0 01496 20 0 014 0 2
118. d up to the display when in Active or Inactive Mode by pressing amp vew The displayed channel must be defined i e not OFF to call up Review array data from Inactive Mode otherwise a long beep results You can move around in the Review array using the arrow buttons The access scheme is shown in Table 2 3 Either the Review array or the Totalizer count can be displayed at one time you must deactivate one before activating the other To remove the Review data from the display and restore the previous display press again or press Y Overview Viewing the Totalizer Count To clear out the contents of the Review array press to call the review data up to the display and then select CLEAR G sevew The entire array is then cleared array values including the displayed value are changed to If a scan is occurring when a review clear is requested new review values are taken from the next scan If the Scan function is not active continues to be shown for all values Alarms are shown with the LAST review values Refer to Alarm Indications in Chapter 3 for a description of alarm annunciation Table 2 3 Review Array Activate Review Points Deactivate 4 lt gt 20 LAST MIN MAX or T L v 0 LAST MIN MAX Viewing the Totalizer Count The Totalizer continuously samples the Totalizer input on the rear panel The present count can be called up to the display wh
119. disabled and the REM annunciator is lit If this command is used with the IEEE 488 interface an Execution Error is generated SCALE_MB Set Mx B Scaling Values Set the M and B scaling values for the indicated channel and display the results of the Mx B calculation in the indicated display range Successful execution of this command clears all values in the Review array all channels SCALE MB channel M value B value disp range channel 0 20 lt M_value gt signed numeric quantity lt B_value gt signed numeric quan lt disp_range gt 16 lt disp_range gt 1 16 CODE DISPLAY MAXOFFSET CODE DISPLAY MAX OFFSET VALUE VALUE 1 0 0000 m 0 01 9 0 0000 k 1 0 4 2 00 000 0 1 10 00 000 k 1 0E5 3 000 00 m 1 0 11 000 00 k 1 0E6 4 0000 0 m 1 0 12 0000 0 k 1 0E6 5 0 0000 x1 10 0 13 0 0000 1 0E7 6 00 000 x1 100 0 14 00 00 1 0E8 7 000 00 x1 1000 0 15 000 00 1 0E9 8 0000 0 x1 1000 0 16 0000 0 M 1 0E10 When M 1 and B 0 Mx B scaling is effectively nonexistent The values for M and B must be in the span 9999 9 Mega E 6 An Execution Error is generated for any of the following Invalid entries for channel number M or B values or display range code are used The range required by the B value is larger than allowed by the display range code The channel is defined as OFF Measurements are active Mx B scaling values for a channel are automatically reset to 1 M and 0
120. display should now read OL This indicates that the counter has been overrun Totalizer Sensitivity Test 1 2 3 Perform the Totalizer Test and assure it is operational Remove the jumper connecting the 52 terminal test lead to output 0 test lead Assure Hydra Series II is still in the total measuring mode If not press the TOTAL button Reset the totalizer count shown on the display by pressing Hydra Series front panel SHIFT button followed by ZERO total button Hydra Series II s display should now show a value of 0 Connect the output of the signal generator to the 3 and ground terminals Program the signal generator to output a 1 5V rms sine signal at 10 Hz Maintenance 6 Performance Tests Hydra Series II s display should now show the totalizing value incrementing at a 10 count per second rate Dedicated Alarm Output Test The Dedicated Alarm Output Test verifies that Alarm Outputs 0 through 3 are functioning properly Because this test is dependent on voltage readings the Accuracy Verification Test for channel 0 and the Channel Integrity Test for channels 1 through 3 should be performed if voltage readings are suspect 1 2 10 11 Switch OFF power to the instrument and disconnect all high voltage inputs Remove the Alarm Output eight terminal connector module from the rear of Hydra Series II and all external connections to it Connect short wires to be used as test leads to the ground
121. display shows the results of computer interface initiated actions even if the front panel controls have been disabled The remainder of Chapter 2 as well as Chapter 3 relates to front panel control of the instrument Refer to Chapter 4 for additional information about computer interface operation Left Display The left display has five large numeric characters to show measurement results otc when an open thermocouple is detected or OL when a measurement is over range During Configuration Mode the left display is also used to display the numeric values and instrument parameters being chosen Right Display The right display has five small alphanumeric characters to show the channel number display prompting information during setups or to count down the scan interval Specific Annunciators The rest of the display is devoted to specific annunciators combinations of which are used to describe the operating mode the type of measurement being displayed or the type of setup information to be entered These annunciators are described in Table 2 1 and shown in Figure 2 5 Overview Front Panel Buttons Front Panel Buttons Go ahead and press any front panel button The instrument always provides an audible response to each button press Valid entries yield a short beep incorrect entries yield a longer beep Dont worry if you press an inappropriate button and get a long beep you can t damage the instrument It will disca
122. dstt dst_bytes return dst bytes Figure E 1 ASCII String Decoding Appendices Binary Upload of Logged Data LOG BIN 2625A only The raw data output array contains the information listed below Note that the number of floating point values is equal to the number of channels in use plus one The totalizer count is always present in the data and is stored as a floating point number e Time stamp BCD format byteO hours bytel minutes byte2 seconds byte3 month byte4 date byte5 year e Temperature units measurement rate and I O byte6 temperature units and rate 0x10 bit means degrees Fahrenheit else Centigrade 0x01 bit means fast rate else slow rate byte7 Alarm outputs byte8 Digital Totalizer value as 32 bit single precision IEEE floating point number stored using the byte ordering shown below The format of this number is explained under Floating Point Conversion byte 9 MMSB of float byte 10 MLSB of float byte 11 LMSB of float byte 12 LLSB of float e Measurement data only defined channels are included exactly like LOG query same floating point format but with a wider range of values NaN Not a Number is used to indicate open thermocouple and plus or minus Inf infinity to indicate overload The bit values for NaN and Inf are explained in the next section byte 13 MMSB of float byte 14 MLSB of float byte 15 LMSB of float byte 16 LLSB of float by
123. e Calibrator DMM Calibrator Function Signal Generator Minimum Specification DC Voltage Range 90 mV to 300V Accuracy 005 AC Voltage Frequency Voltage Accuracy 1 kHz 29 mV to 300V 0 05 100 kHz 15 mV to 300V 1 25 Frequency 10 kHz Ohms Accuracy 2900 0 0125 2 9 0 0125 29 0 0125 290 0 0125 2 9 0 0125 Note The 5700A Calibrator can be used for 0 05 accuracy rated on the 3 0 kQ 30 kQ and 3 0 ranges The 5700A can be used for 0 06 accuracy on the 3000 range 0 02 degrees Celsius resolution Type K Thermos bottle and cap Measures 5V Sinewave 0 5 to 1V rms 10 Hz to 5 kHz Alternate Equipment List Fluke 5440B Recommended Model Fluke 5100B for AC Volts only Philips PM5193 or Fluke 6011A Recommended Model Fluke 5700A General Resistance Inc Model RDS 66A Princo ASTM 56C Fluke P 20K Fluke 77 Fluke 6011A Maintenance 6 Performance Tests Accuracy Verification Test 1 Power up the instrument and allow it to temperature stabilize for 1 2 hour 2 Connect a cable from the Output VA HI and LO connectors of the 5700A to the VQ and COM connectors on the front panel of the Hydra Series II Instrument Select the channel 0 function and range on the Hydra Series II and the input level from the 5700A using the values listed in Table 6 3 Press the MON monitor button to measure and display the measurement valu
124. e Program Using the RS 232 Computer Interface Using the IEEE 488 TEEE 488 Operating Limitations esee Installing the IEEE 488 Interface esee Enabling the IEEE 488 Interface eese Installation EE General Information RS 232 and 488 00 How the Instrument Processes Input eese Input StrIn8sS u ise ere a a Input Terminators Typical Input Strings recie rie hebraice Rete Sending Numeric Values to the Instrument RS 232 and IEEE 488 Sending Input Strings to the Instrument eere How the Instrument Processes Output eee Service Requests IEEE 488 only and Status Registers Event Status and Event Status Enable Registers 4 1 2620A 2625A Users Manual Status Byte Re distet Reading the Status Byte Register Service Request Enable Register Instrument Event Register a nnne Computer Interface Command Set seen 4 2 Using the Computer Interface 4 Introduction Introduction The instrument can be operated from a host via commands sent through the rear panel computer interface The host can be a terminal controller PC or other computer
125. e built in scan interval timer controls when scan measurements are taken However two additional mechanisms are available for activating scans 1 external trigger signal connected at the rear panel TR input 2 An alarm condition on the Monitor channel Note These two additional trigger mechanisms are mutually exclusive The External Trigger input and Monitor Alarm trigger can be enabled from the front panel or through computer interface commands Front Panel Trigger Control To access the trigger controls from the front panel select TRIGS Then press or A to cycle through the choices for trigger types OFF Both External and Monitor Alarm triggers are disabled On The External Trigger input is enabled ALAr The Monitor Alarm trigger is enabled Press once you ve selected the desired trigger type Note that internal scan interval triggering is not affected by this selection and remains available Computer Interface Trigger Control Select a scan trigger type over the computer interface by sending the command TRIGGER lt type gt where lt type gt is 0 Both External and Monitor Alarm triggers are disabled 1 The External Trigger input is enabled 2 Monitor Alarm trigger is enabled If one of these types is not specified an Execution Error is generated 5 3 2620A 2625A Users Manual Verify the trigger type over the computer interface by sending the query TRIGGER Single scans c
126. e for channel 0 The display should read between the minimum and maximum values listed in the table Channel Integrity Test Assure the Accuracy Verification Test for channel 0 meets minimum acceptable levels before performing this test 1 Switch OFF power to the instrument and disconnect all high voltage inputs 2 Remove the Input Module from the rear of the instrument Open the Input Module and connect a pair of test leads to the H high and L low terminals of channel 1 Install the Input Module back into the instrument Connect the ends of the test leads together to apply a short 0 ohms 4 Reconnect power and switch the instrument ON For channel 1 select the 2 terminal ohms function and 300 ohms range on the Hydra Series II Instrument Press MON and ensure the display reads a resistance of less than or equal to 4 0 ohms This test assumes that lead wire resistances are less than 0 10 Open the ends of the test leads and ensure that the display reads OL overload Press MON This will stop the measurement 8 Connect a cable from the Output VA HI and LO of the 5700A to the Input Module test leads observe proper polarity 9 Select the VDC function and 300 volt range on the Hydra Series II and apply first OV dc then 290V dc input from the 5700A Ensure the display reads between the minimum and maximum values as shown in Table 6 3 for the 0 and 290V dc input levels Note Channels 0 1 and 11 can accommodate a maximum in
127. e instrument returns to Inactive Mode For resistance measurements one more step is required to specify 2 terminal 2T or 4 terminal 4T measurements Since 4 terminal measurements require two channels 4 terminal measurements can be set up on channels 1 10 only For each 4 terminal channel a corresponding channel 11 20 ten numbers higher is reserved for the additional two connections required Press the buttons as follows A Choose between two terminals 2T and four terminals 4T Accept your choice The instrument returns to Inactive Mode If you ve specified temperature measurements the instrument provides a choice of thermocouple types or Platinum RTD Press the buttons as follows A Cycle through the thermocouple choices Pt is the RTD choice Accept your choice If you selected one of the thermocouple types channel configuration is complete the instrument returns to Inactive Mode If you selected Pt for RTD based measurements use the following buttons to specify 2 terminal 2T or 4 terminal 4T measurements and the RO value Since 4T measurements require two channels 4 terminal measurements can be set up on channels 1 10 only For each 4T channel a corresponding channel 11 20 ten numbers higher is reserved for the additional two connections required A Choose between two terminals 2T and four terminals 4T Accept your choice Now choose the RO ice point value preset to 100 00
128. e state of the Digital I O lines and the totalize count The time and date are returned in the following order Hours 0 23 Minutes 0 59 Seconds 0 59 Month 1 12 Date 1 31 Year 0 99 Measurement data is returned as a list of scientific notation values For an overload OL 1E 9 is returned If an open thermocouple is detected 9E 9 is returned Alarm output and digital I O values are returned as integer values Totalizer value is returned as a scientific notation value Channels defined as OFF are not included If all channels are defined as OFF an Execution Error is generated PRINT Data Logging Enable Disable RS 232 only Turn data logging on or off PRINT state lt state gt 1 on 0 off An Execution Error is generated if any other value is used or if this command is used with the IEEE 488 interface PRINT Data Logging Query RS 232 only Return the status of data logging Returns 0 OFF or 1 ON An Execution Error is generated if this query is used with the IEEE 488 interface PRINT_TYPE Set Data Logging Type RS 232 only Enable internal Memory Storage or Autoprint and set the type of scan data logged PRINT_TYPE lt destination gt lt type gt lt destination gt 0 PRINT SCANS 1 STORE SCANS 2 BOTH 0 ALL 1 channel in ALARM 2 channel had alarm TRANSition lt type gt An Execution Error is generated if any other value is used if this command is used with a 2620A and yo
129. earth terminal Protective ground earth terminal Must be connected to safety earth ground when the power cord is not used See Chapter 2 P Attention refer to the manual This symbol indicates that information about usage of a feature is contained in the manual This symbol appears in the following two places on the instrument rear panel 1 Ground Binding Post left of line power connector Refer to Using External DC Power in Chapter 2 2 Alarm Outputs Digital I O Connectors Refer to Appendix A Specifications A Warning To avoid electric shock e When the input module is installed consider all channels with connections as accessible terminals that may be hazardous live e Disconnect the input module before touching or changing external wiring e Remove inputs from live voltages before opening the input module 2620A 2625A Users Manual AC Power Source The instrument is intended to operate from an ac power source that will not apply more than 264V ac rms between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is required for safe operation DC Power Source The instrument may also be operated from a 9 to 16V dc power source when either the rear panel ground binding post or the power cord grounding conductor is properly connected Use the Proper Fuse To avoid fire hazard use only a fuse identica
130. ecked for proper syntax until an input terminator is received If the RS 232 input buffer becomes full a Device Dependent Error prompt is returned and the input string is ignored The instrument accepts alphabetic characters in either upper or lower case If a command cannot be understood i e the equivalent of an IEEE 488 Command Error the command and the rest of the command line are ignored Input Terminators An input terminator is a character or command IEEE 488 1 sent by the host that identifies the end of a string of one or more commands When an input terminator is received RS 232 applications the instrument executes all commands entered since the last terminator was received on a first in first out basis In IEEE 488 applications commands are not delayed until receipt of an input terminator commands are executed as they are received As input characters are processed and commands executed space is made available in the input buffer for new characters In RS 232 applications if a communications error e g parity framing overrun is detected or the input buffer fills a device dependent error is generated If the input buffer is full new characters are ignored as the instrument waits for a termination character If on the other hand the input buffer becomes full when the IEEE 488 interface is used the instrument stops accepting characters until there is room in the buffer Characters in the input buffer cann
131. ect it for possible damage or missing items If the instrument is damaged or something is missing contact the place of purchase immediately Save the container and packing material in case you have to return the instrument Rotate the rear feet 180 degrees so that their support pads extend slightly below the bottom of the case Adjusting the Handle The handle can be positioned to four angles one for carrying two for viewing and one for handle removal To change the angle simultaneously pull both handle ends outward to hard stops about 1 4 inch on each side and then rotate the handle to one of the four stop positions shown in Figure 2 1 With the handle in the straight up removal position 4 in Figure 2 1 you can disengage and free one handle side at a time 1 Viewing Position 2 Alternate Viewing Position Pull One End Out and Towards You Then Pull the Other End Out 4 Removal Position to Remove Pull Ends Out 3 Carrying Position D O 3 pi 0 oom gt gt gt gt oo01f eps Figure 2 1 Adjusting Handle 2 3 2620A 2625A Users Manual Line Power A Warning To avoid shock hazard connect the instrument power cord to a power receptacle with earth ground Plug the line cord into the connector on the rear of the instrument The instrument operates on any line voltage between 90 and 264V ac without adjustme
132. el control If this command is used with the IEEE 488 interface an Execution Error is generated REVIEW_CLR Clear Review Values Clear all minimum maximum and last values all channels in the Review array It is not possible to selectively clear individual entries in the Review array The Review clearing operation is carried out only at the completion of any scan in progress Clearing the Review array also clears all alarm status RTD_RO RTD Ice Point RO For the indicated channel store the numeric data as RTD RO Successful execution of this command clears all Review array values all channels RTD_RO lt channel gt lt RO gt lt channel gt 0 20 R0 0 lt RO lt 999 99 An Execution Error is generated if the RO value supplied is not within the indicated range the channel specified is invalid the channel is defined as OFF or measurements are active RTD_RO RTD Ice Point RO Query Return RTD RO ice point resistance value for the indicated channel RTD_RO channel lt channel gt 0 20 If the channel number is invalid an Execution Error is generated If a channel is defined OFF or if no change has been made to RO for a channel the value 100 00 is returned 4 41 2620A 2625A Users Manual 4 42 Table 4 8 Command and Query Reference cont RWLS Remote with Lockout RS 232 only Enter the IEEE 488 1 remote with front panel lockout RWLS state All front panel buttons are
133. elf test routine and begin normal operation An error indicates that a malfunction has occurred and maintenance is required If you encounter an error note the number or letter and consult Table 6 1 See if the instrument repeats the error If the problem persists and you intend to repair the instrument yourself refer to the Service Manual Otherwise package the instrument securely using the original container if available Then forward the package postage paid to the nearest Fluke Service Center Include a brief description of the problem Fluke assumes no responsibility for damage in transit 6 3 2620A 2625A Users Manual Power Line Cord Connector To Remove Squeeze and Slide Out T 125 mA 250V Slow Blow Fuse Holder Spare Fuse Provided 0018f eps Figure 6 1 Replacing the Line Fuse Performance Tests When received the 2620A 2625A Hydra Series II instrument is calibrated and in operating condition The following Performance Verification Procedures are provided for acceptance testing upon initial receipt or to verify correct operation at any time All tests may be performed in sequence to verify overall operation or the tests may be run independently If the instrument fails any of these performance tests calibration adjustment and or repair is needed To perform these tests you will need a Fluke 5700A Multifunction Calibrator or equipment meeting the minimum specifications given in Table 6 2 6 4
134. elf tests are completed the instrument enters Inactive or Active Mode depending on the following circumstances 2 9 2620A 2625A Users Manual Active Mode if this mode was in effect prior to the cycling of power Scanning monitoring or combined scanning monitoring is resumed e Inactive Mode if the instrument was in Inactive Mode or Configuration Mode prior to cycling of power When in Inactive Mode the instrument shows configuration information for the displayed channel The channel number appears in the right display and other annunciators are dimly lit to show the present setup for this channel For example if the channel is set up to measure the and annunciators are dimly lit Alternatively if this channel has not been set up to measure anything the OFF annunciator is lit dimly You can change the channel by pressing V Front Panel Display Full descriptions of the display annunciators are presented in Table 2 1 Reading the Display The instrument display uses both alphanumeric characters and fixed annunciators When in Configuration Mode these features are used to provide user prompting In Inactive Mode they provide status information In Active Mode they provide both status information and measurement data Information is presented on the display during both front panel control and computer interface control If the instrument is being controlled through a computer interface the
135. en alarm limit 2 is being defined Also lit when displaying a measurement value LAST Monitor which has exceeded alarm limit 2 Identifies alarm limit sensing high or low during channel configuration At other times identifies an alarm condition Indicates that review data is being displayed used in conjunction with the MIN MAX and LAST annunciators Indicates that the displayed value is the minimum maximum value measured on this channel Indicates that the displayed value is the most recent scan measurement taken on this channel Indicates that the autoprint function is enabled to send readings to a printer or the memory storage function is on to store readings in internal memory Internal memory is available with Hydra Data Logger only Bright when memory storage is full dim when memory storage is nearly full Hydra Data Logger only Indicates that external triggering on the rear panel is enabled Indicates that internal triggering from the monitor alarm is enabled Also used with EXT when external triggering is enabled Indicates that the instrument is under the remote control of one of the computer interfaces Indicates that the instrument s internal calibration constants have been corrupted 90 264V 50 60 Hz 15VA ALARM OUTPUTS mais FOR FIRE PROTECTION REPLACE WITH T 18 250v 510041 Fuse MODEL 2620 2625 IEC 664 INSTALLATIONCATEGORY Il IEEE STD 488 PORT DI
136. en in Active or Inactive Mode by pressing ert The word totAL appears on the right display and the present Totalizer count appears on the left display The maximum count is 65535 after which OL is displayed To reset the Totalizer to Zero press to call the Totalizer value to the display and then select ZERO To remove the Totalizer value from the display and restore the previous display press again or press V Note that either the Review array or the Totalizer count can be displayed at one time you must deactivate one before activating the other Using External DC Power The instrument can be powered from an external 9 to 16V dc source Refer to Appendix A Specifications for additional information about dc power requirements Terminals for positive negative and ground connections are provided on the instrument rear panel Figure 2 6 shows connection locations A Warning If voltages greater than 30V are to be measured a safety ground must be attached to the rear panel ground connector when the instrument is operated from battery power 2620A 2625A Users Manual Using the Rack Mount Kit Use the 00 200 634 Rack Mount Kit to mount the instrument a standard 19 inch rack First rotate the two bottom feet on the instrument 180 degrees so that the support pads point up Then install the instrument per the instructions provided with the Rack Mount Kit Chapter 3 Operating the Instrumen
137. er Fluke 17XXA series printer or modem All connections can be made using the Fluke RS series of cables see Options and Accessories in Chapter 1 RS 232 cables should not exceed 50 feet 15 meters although longer cables are permitted if the load capacitance measured at a connection point including signal terminator does not exceed 2500 picofarads The Fluke RS cables are 6 feet 1 83 meters in length Connections Figure G 1 summarizes the cable requirements for all typical RS 232 connections Figure G2 through G6 summarize instrument cabling diagrams Figure G7 shows the pin arrangement for DB 9 and DB 25 connectors There are two wiring schemes modem and null modem two types of connectors DB 9 and DB 25 two cable end conditions male and female and two equipment configurations Data Terminal Equipment DTE and Data Communications Equipment DCE Because of variations in RS 232 connectors it is not possible to identify all possible configurations In this application null modem refers to a reversing of the following lines receive RX and transmit TX data terminal ready DTR and data set ready DSR and request to send RTS and clear to send CTS Not all interfaces use all lines Check the documentation for the equipment you are interfacing with the instrument Cables The Fluke RS series of RS 232 cables are in the following standard configurations e RS40 Null modem with DB 9 female and DB 25 female connect
138. er to this chapter for explanation of error codes encountered during instrument operation Also this chapter provides parts ordering information for such commonly used items as fuses accessories and publications Refer to the Hydra Series II Service Manual P N 688868 for complete service repair and parts ordering information Appendices A Specifications 488 Bus Codes IEBE 488 2 Device Documentation Requirements D Making Mixed Measurements Service Centers E Binary Upload of Logged Data LOG BIN 2625A only Index Chapter 2 Overview AREE Setting Up the Instrument Unpacking and Inspecting the Adjusting the Handle u eerie RB ae eere Her tele AME PO WET ua un des Front Rear Panel Input Operating Modes niente rne HER i SR Turning the Instrument Pront Panel Display irai tne Eo RR eio due Reading the Display 2 edere retener eo qasa aka entia edP e FRE eC eda Lett Display m Right Specific AMMUNCIALOLS i Front Panel Buttons eene nter enin te ierasta i eda selecting Channel ne rni
139. ert the RTD probe and a mercury thermometer in a room temperature bath Allow 20 minutes for thermal stabilization Dependent on the type connection made in step 2 select either the 2 Terminal or 4 Terminal RTD temperature function RTD type PT DIN IEC 751 for channel 1 on the Hydra Series Instrument Press and ensure the display reads the temperature of the room temperature bath within tolerances shown in Table 6 6 as measured by the mercury thermometer Table 6 6 Performance Tests for RTD Temperature Function DIN IEC 751 Amendment 1 IPTS 68 4 wire RTD TYPE TEMPERATURE ACCURACY SPECIFICATIONS 1 YEAR 18 28 DEGREES C 2 wire channel 0 0 54 C to 0 59 C 2 wire channels 1 20 0 54 C to 11 54 C 0 54 C Assumes RTD is set to 100 00 ohms for each channel 6 The RTD Temperature Accuracy test is complete However if you desire to perform this test on any other channel 0 or 2 through 20 repeat steps 1 through 5 substituting in the appropriate channel number Note The only type of temperature measurement that can be made on channel 0 is 2 terminal RTD Channels 11 through 20 will support only 2 terminal RTD s Digital Input Output Verification Tests Digital Input Output verification testing requires computer interfacing with a host terminal or computer The host must send commands to the instrument to control the digital lines for this test Refer to Chapter 4 for a description of configuri
140. ervals of 5 Hz will generally contribute no more error to a resistance measurement than frequencies of 50 or 60 Hz It is not necessary to follow all of these guidelines In fact for most applications adhering to just one of these guidelines will provide satisfactory results Refer to Appendix D for detailed information about cross talk Using Shielded Wiring Shielded wires and sensors such as sheathed thermocouples are often used in noisy environments to reduce measurement errors When you are connecting these sensors to a measuring instrument the proper connection of the shield depends on the entire measurement system and environment General Rule Connect the shield to L low at the input terminals for each Hydra Series II channel Alternate Suggestions In specific instances following the General Rule may not result in the optimum noise rejection it may be necessary to try alternate configurations and check for improved performance Non Isolated Sensor Configuration If non isolated sensors are used e g a thermocouple probe where the sensor and its shield are electrically connected try leaving the shield disconnected open at the 2620A 100 Input Module Isolated and Shielded Sensor Configuration ANWarning The following suggestions rely on the shield being kept electrically isolated from the sensor h high and 1 low wiring except where specifically stated otherwise If isolated and shielded sensors are used with the
141. es D Making Mixed Measurements AC Signal Crosstalk Into a Temperature Channel Frequency 50 60 Hz TEMPERATURE Error Ratio Geran VACrms crosstalk Types J K E Worst case Typical xpae E Vrms Vrms C 4 C Types R S B C 1 1x 2 0 Vrms Vrms Pg 5 Type PT RTD 8 6x 10 No Effect Vrms D 3 2620A 2625A Users Manual D 4 Appendix E Binary Upload of Logged Data LOG BIN 2625A only Introduction The LOG BIN index query can be used to quickly upload logged data from a 2625A The response is a single ASCII string which encodes the raw binary data stored at the specified index position The logged data is also retained in the 2625A The measurement data returned from the 2625 is in the binary IEEE single precision floating point format Making use of this data can be difficult and is very machine dependent A working example using the C programming language on an IBM PC is provided in this appendix This example uses a pre computed LOG BIN response string and checks that the conversion process works as expected Two steps are required in adapting the LOG BIN response string for use with your computer e First you must decode the ASCII string into binary data For example one possible LOG BIN response string is LOG BIN 1 42 YA40B A0000000007000010P000 h000 gt This ASCII string represents the following binary
142. f Logged Data PRINT Data Logging Enable Disable PRINT Data Logging Query PRINT_TYPE Set Data Logging Type PRINT_TYPE Data Logging Type Query LOCS Local without Lockout LWLS Local with Lockout REMS Remote without Lockout RWLS Remote with Lockout ECHO Enable disable echoing Using the Computer Interface Computer Interface Command Set Table 4 7 Command and Query Summary cont Response Format FORMAT FORMAT Response Format Query Response Format Review Array REVIEW_CLR Clear Review Values Scan INTVL Set Scan Interval INTVL Scan Interval Query SCAN Enable Disable Scanning SCAN Return Scan Status SCAN_TIME Time of Scan Temperature Unit TEMP CONFIG TEMP CONFIG Temperature Configuration Temperature Configuration Query Time Date DATE Set Date TIME Set the instrument clock TIME DATE Retrieve Time and Date Totalizer TOTAL Set Totalizer Count TOTAL Totalizer Value Query TOTAL DBNC Set Totalizing Debounce TOTAL DBNC Totalizer Debounce Query Triggering TRIGGER Select Trigger Type TRIGGER Trigger Type Query 4 25 2620A 2625A Users Manual 4 26 Table 4 8 Command and Query Reference CLS Clear Status Clears all event registers summarized in the status byte except for Message Available which is cleared only if CLS is the first message in the queue ESE Event Status Enable Sets the Event Status Ena
143. ger Values Examples 3 In response to RANGE query range is 3 for the selected function 0 In response to ALARMS query there are no alarms on this channel e Scientific Notation Values 1 2345E 6 Measured value of 1 2345 X 10 12 345E 6 OHM Measured value of 12 345 X 10 ohms format 2 1E 9 Positive overload OL appears on the display 1E 9 Negative overload OL appears on the display 9E 9 Open thermocouple indication appears on the display Service Requests IEEE 488 only and Status Registers Service requests let an instrument on the IEEE 488 bus get the attention of the host Service requests are sent over the service request SRQ line Note If the instruments is in the remote state without front panel lockout i e REMS a service request can be sent from the front panel by pressing up button picture If more than one instrument on the bus is capable of sending service requests the host can determine which instrument made the request by taking a serial poll Each instrument on the bus responds to the poll by sending the contents of its Status Byte Register STB If an instrument on the bus has made a service request the request service bit RQS bit 6 of its Status Byte Register STB will be set to 1 identifying it as an instrument that requested service The contents of the Status Byte Register STB are defined by the Service Request Enable Register SRE Event Status Regi
144. guration 3 4
145. he Instrument a Adjusting the Handle Line POWET Front Rear Panel Features aaa Input Channels 2 RR Ihre lan a asua Operating Modes Turning the Instrument eene rennen nennen nenne Front Panel Display ertet deett entera no aaa Reading the Display inrer Rete ret ere br Left DiS play Em sete qaa Specific Front Panel Buttons aasan ee De eot Selecting a 8 trente Using the Buttons Tee pe ek Ceo EC RU HR TER ud eg Setting up a 2 itt tte tano Setting Alarm Limits and Mx B Scaling Values XE LIHWNUS m MX B Scalig eee endete rete ee Setting the Scan 2 Using the Monitor Function 2620A 2625A Users Manual Using the Sc n Punctioh Reviewing Channel D ta eerte ette tet teli etre coge Viewing the Totalizer Count Usine External DC ertet rre qaa ae lage asa Using the Ra
146. he pairs of terminals for channels 1 and 3 We ve enclosed some thermocouple wire for you to connect to channel 4 the thermocouple s red lead must be connected to the low input terminal labeled L Note that the enclosed thermocouple is for demonstration purposes only Measurements taken with it may be off by 1 2 degrees Refer to Table 3 14 in Chapter 3 to identify the type of thermocouple by positive lead color This table also shows the appropriate usable temperature range 4 Thread the wires through the strain relief pins and out the back of the module 5 Close the cover secure the screws and insert the module back in the instrument The instrument is now ready to take measurements Start with the Monitor function which takes repeated measurements on a channel Press to select a channel to Monitor Press to activate the monitor function xiii 2620A 2625A Users Manual Note You cannot activate the Monitor function if the selected channel is set up as OFF the instrument gives a long beep and ignores your request The MON annunciator comes on and the instrument starts taking measurements on the selected channel If you haven t connected the input leads to a signal the instrument simply displays a nominal noise reading on channels set up to measure resistance OL is displayed for overload The instrument also displays OL or otc for open thermocouple when attempting to measure temperatures on cha
147. hex data 10 24 29 10 04 91 00 Of ff 00 00 00 00 7f cO 00 00 7f 80 00 00 3f 80 00 00 00 00 e Second you must convert this binary data into valid floating point numbers for your underlying computer architecture Decoding the ASCII String The ASCII response string contains six bits of raw data for each ASCII character offset from ASCII 0 0x30 hex 48 decimal Therefore the conversion process subtracts 48 from the integer value of each character then shifts it into place Each set of four ASCII characters form three bytes of raw data The number of bytes of raw data depends on the number of channels for the scan The following C code converts a LOG BIN response string into a byte array E 1 2620A 2625A Users Manual int decode dst src decode Decode LOG_BIN response string into raw byte stream Decoding is done on multiples of four input bytes 543210 543210 543210 543210 bit number in ASCII bytes src 0 src 1 sre 2 src 3 ASCII string input 765432 107654 321076 543210 bit number in raw bytes 76543210 76543210 76543210 bit number in raw bytes
148. ignal can be sent to the instrument causing it to take an extra set of scan measurements e Ifscan measurements are occurring when the trigger requesting a single scan arrives this request for another scan is ignored This stipulation applies whether the scan in progress was initiated by the scan interval timer a command over the computer interface or from a previous external trigger signal e If the instrument is in Inactive Mode or just the Monitor function is selected the low trigger signal enables interval scanning Scans are executed at the specified scan interval If the scan interval is 0 continuous scanning results a small scan interval time effectively becomes continuous scanning When the TR input returns high interval scanning is disabled This feature is handy in cases where you want to begin normal scheduled scans after the system under test has reached some particular operating condition When that condition arises a trigger signal can be sent to the instrument causing it to begin interval scanning e If the instrument is in Configuration Mode all external trigger signals are ignored The instrument must be in Inactive Mode or Active Mode before any external trigger signal will be recognized The external trigger accepts a contact closure or logic low signal the input is non isolated and TTL compatible Note that scanning is enabled on the falling edge of the trigger signal This trigger signal must be held low for a
149. il there is room in the buffer for a new byte Which queries return more than one RESPONSE MESSAGE UNIT Section 6 4 3 The following queries always return more than one RESPONSE MESSAGE UNIT LOG NEXT INTVL TIME DATE PRINT TYPE IDN SCAN TIME SCALE MB The following queries may return more than one RESPONSE MESSAGE UNIT FUNC MIN MAX LAST ALARMS RANGE ALARM LIMIT Which queries generate a response when parsed Section 6 4 5 4 All queries generate a response when parsed Which queries generate a response when read Section 6 4 5 4 No queries generate a response when read by the controller Which commands are coupled Section 6 4 5 3 No commands are coupled A list of functional elements used in constructing device specific commands Whether compound command program header elements are used must also be included Section 7 1 1 and 7 3 3 Device specific commands used PROGRAM MESSAGE PROGRAM MESSAGE TERMINATOR Appendices C IEEE 488 2 Devise Documentation Requirements 10 lt PROGRAM MESSAGE UNIT gt lt PROGRAM MESSAGE UNIT SEPARATOR gt lt COMMAND MESSAGE UNIT gt lt QUERY MESSAGE UNIT gt lt COMMAND PROGRAM HEADER gt lt QUERY PROGRAM HEADER gt lt PROGRAM DATA gt lt CHARACTER PROGRAM DATA gt lt DECIMAL NUMERIC PROGRAM DATA gt A description of any buffer size limitations related to block data Section 7 7 6 5 No block data is used A list of
150. ined as OFF or if values other than 0 or 1 are given an Execution Error is generated The MON and SCAN commands work in conjunction with the front panel controls The Monitor and Scan functions can be enabled or disabled from either the front panel or the computer interface The most recently specified monitor channel from front panel or computer interface becomes the one channel monitored Front panel and buttons work only when the lockout state is LOCS MON_CHAN Monitor Channel Number This query asks for the number of the presently defined monitor channel If monitoring is not active an Execution Error is generated MON_VAL Monitor Channel Value This query asks for a measurement on the monitor channel If monitoring is not active an Execution Error results Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont NEXT Next Scan s Values The NEXT query returns data values for the next scan to complete If a scan is in progress when the NEXT query is processed the data values returned are from the scan in progress If a scan is not presently in progress the NEXT query waits for data to become available When scanning is occurring use the NEXT query to return data from each scan NEXT returns comma separated information for the date and time at the start of the next measurement scan the values for channels measured th
151. instrument If you have accidentally activated Calibration and wish to exit immediately press CAL ENABLE until CAL disappears from the display or turn power OFF 3 27 2620A 2625A Users Manual 3 28 Chapter 4 Using the Computer Interface ento ET Front Panel and Computer Interface Operations Types of Computer Interface eese Using the RS 232 Computer Interface Setting Communication Parameters RS 232 Autoprint and Memory Storage RS 232 sese Autoprint Computer Interface Control Autoprint Output Format eese Memory Storage Computer Interface Control Memoty Retrieyal icai eee terti eee eT th edo Memory Full Operation essent nennen nennen Clearing Memory ERU Er RH EUER Cabling the Instrument to a Host or Printer RS 232 Installation Ec rc RS 232 Information L Ulna hinaqa asb Character Echoimg cu ren tdeo eid Character Deletion idee ie tees rte ELTE e Lebe ad casita Device Clear Using Ctrl C L eee riter tton ataca 5 232 Sampl
152. ivalent of IEEE 488 device clear causing the output sequence gt CR carriage return lt LF gt line feed Use of CTRL C clears the RS 232 input buffer Using the Computer Interface 4 Using the IEEE 488 Interface RS 232 Prompts The instrument parses and executes in turn each command received from the host over the RS 232 interface The instrument returns one of the following three response prompts to indicate the results of command execution gt No errors the command was successfully parsed and executed gt The command was not understood Used when an IEEE 488 2 Command Error Query Error was generated by the command gt The command was successfully parsed but could not be executed for some reason Used when an IEEE 488 2 Execution Error or Device Dependent Error was generated for the command An example of this would be trying to execute a calibration command when calibration mode is not enabled Sample Program Using the RS 232 Computer Interface Figure 4 2 presents a sample program for controlling the instrument over the RS 232 interface This program is written in BASIC and is compatible with IBM PC PC AT or equivalent personal computers Using the IEEE 488 Interface IEEE 488 Operating Limitations The following limitations govern the IEEE 488 interface e A maximum of 15 devices can be connected to a single IEEE 488 bus system e The maximum length of IEEE 488 cable used in one IEE
153. l in type voltage rating and current rating as specified on the rear panel fuse rating label Grounding the Instrument The instrument utilizes controlled overvoltage techniques that require the instrument to be grounded whenever normal mode or common mode ac voltages or transient voltages may occur The enclosure must be grounded through the grounding conductor of the power cord or if operated on battery with the power cord unplugged through the rear panel ground binding post Use the Proper Power Cord Use only the power cord and connector appropriate for the voltage and plug configuration in your country Use only a power cord that is in good condition Refer cord and connector changes to qualified service personnel Do Not Operate in Explosive Atmospheres To avoid explosion do not operate the instrument in an atmosphere of explosive gas Do Not Remove Cover To avoid personal injury or death do not remove the instrument cover Do not operate the instrument without the cover properly installed Normal calibration is accomplished with the cover closed and there are no user serviceable parts inside the instrument so there is no need for the operator to ever remove the cover Access procedures and the warnings for such procedures are contained in the Service Manual Service procedures are for qualified service personnel only Do Not Attempt to Operate if Protection may be Impaired If the instrument appears damaged or operates abno
154. learing Memory 5 3 19 REM Annunciation essere enne nnne 4 1 5 23258 4 2 488 1 Capabilities 4 12 4 3 488 4 4 Status Byte 1 4 5 Event Status 4 6 Instrument Event Register IER 4 7 Command and Query 4 8 Command and Query eene nre 5 1 Ohms Test Voltage eoe deperire tae ere ee ee ene Ee E Ee HIER ac oh 6 1 Power Up Error Codes 22 12 10 einen 6 2 Recommended Test Equipment 2620A 2625A Users Manual 6 3 6 5 6 6 E 1 Performance Tests Voltage Resistance and Frequency Performance Tests for Thermocouple Temperature Function IPTS 68 ITS 90 Performance Tests for RTD Temperature Function Resistance DIN IEC 751 jM EL 6 14 Performance Tests for RTD Temperature Function DIN IEC 751 Amendment 1 Amendment 1 IPTS IPTS 68 Digital Input Values Floating Point Format 6 8 Figure 2 1 2 2 2 3
155. left to right as follows 1 Commands to configure the instrument if any 2 The trigger command TRG 3 Queries to read the result of a triggered measurement LAST or to reconfigure the instrument if any 4 The terminator How the Instrument Processes Output The instrument outputs an alphanumeric string in response to any query from the host Query commands are easily identified because they all end with An output string is terminated by a Carriage Return and Line Feed lt CR gt lt LF gt for RS 232 applications or a Line Feed with End or Identity LF EOI for IEEE 488 applications After sending the instrument a command string via the RS 232 interface wait for the instrument to return a prompt before sending another command string A command string can consist of 1 or more syntactically correct commands If you do not do so a device dependent command error is generated and the second string is discarded If the instrument is used in an IEEE 488 bus system the output data is not actually sent onto the bus until the host addresses the instrument as a talker When the output buffer is Using the Computer Interface General Information RS 232 and IEEE 488 loaded the Message Available MAV bit in the Status Byte Register is set true For more information see Status Byte Register later in this chapter Numeric output from the instrument is returned as shown in the following examples e Inte
156. lready made to the M value Setting the Scan Interval Press to set the scan interval The latest value appears on the right display The format of the display is H MM SS Use P gt and 9 to move between digits Use and to select the new value for a digit Values ranging from 0 00 00 to 9 99 99 are allowed Press to accept the displayed value Set the interval to 0 00 00 for continuous scanning If you set the interval to a value shorter than the time required to measure all channels scanning effectively becomes continuous 2 15 2620A 2625A Users Manual Using the Monitor Function The Monitor function repeatedly measures the displayed channel Press to activate the Monitor function Use and to change the monitored channel undefined channels those set to OFF are automatically skipped over Since the instrument cannot take measurements on a channel that has not been set up it responds with a long beep if you try to activate the Monitor function on a channel that is defined as OFF Press or V to find a channel that has been set up then activate the Monitor function If all channels are defined as OFF you must first set up one or more channels before activating the Monitor function Note The Monitor function does not update data in the Review array an Autoprint listing or data memory 2625A These values are updated only with measurements taken by the Scan function Using the Scan Function The
157. lsius F Indicates that the measurement function is temperature for this channel and that the degree unit is Fahrenheit m milli a multiplier for the displayed value e g mV for millivolts Also used when defining alarm and Mx B values x1 times 1 a multiplier for the displayed value Used when defining alarm and Mx B values k kilo a multiplier for the displayed value e g kHz for kilohertz Also used when defining alarm and Mx B values M mega a multiplier for the displayed value e g MQ for megohms Also used when defining alarm and Mx B values RO Lit when the ice point resistance is being defined for RTD measurements on the displayed channel OFF Indicates there is no measurement function defined for the displayed channel OFF channels are skipped over when scanning OFF is also used when defining an alarm value to indicate that the alarm limit is to be ignored AUTO Indicates that autoranging is enabled for the displayed channel LIMIT Used with the and B annunciators when you are setting an alarm limit value Also lit when displaying a measurement value LAST Monitor which has exceeded an alarm limit 2620A 2625A Users Manual Table 2 1 Display Annunciators cont bs HI LO REVIEW MIN MAX LAST PRN EXT TR REM CAL Lit when alarm limit 1 is being defined Also lit when displaying a measurement value LAST Monitor which has exceeded alarm limit 1 Lit wh
158. lt PROGRAM DATA gt elements which may appear within lt expression gt as well as the maximum sub expression nesting depth Any additional syntax restrictions which the device may place on the lt expression gt shall also be included No sub expressions are used The only PROGRAM DATA functional elements used are CHARACTER PROGRAM DATA AND DECIMAL NUMERIC PROGRAM DATA A description of the response syntax for every query Section 8 NRI NUMERIC RESPONSE DATA is returned for ESE ESR OPC SRE STB TST IEE IER RANGE INTVL TEMP CONFIG MON CHAN ALARMS ALARM ASSOC ALARM DO LEVELS TOTAL DBNC TIME DATE TRIGGER EEREG SCAN TIME LOG COUNT DIO LEVELS NR3 NUMERIC RESPONSE DATA is returned for MON VAL TOTAL RTD_RO MIN MAX LAST CHARACTER RESPONSE DATA is returned for IDN FUNC The following queries return data in two formats ALARM LIMIT Sense HI LO OFF in CHARACTER RESPONSE DATA Value if HI or LO in NR3 NUMERIC RESPONSE DATA SCALE MB M and B values in lt NR3 NUMERIC RESPONSE DATA Resultant display range NRI NUMERIC RESPONSE DATA NEXT LOG Time date and digital I O values in NRI NUMERIC RESPONSE DATA gt Measurement data and Totalizer in NR3 NUMERIC RESPONSE DATA A description of any device to device message transfer traffic which does not follow the rules for lt RESPONSE MESSAGE
159. minimum of 5 microseconds it must also have previously been unasserted high for at least 100 milliseconds Refer to Figure 5 1 Signal level constraints are as follows High 2 0V min 7 0V max Low 0 6V min 0 8V max Additional Considerations Advanced Trigger Mechanisms 5 ALARM OUTPUTS DIGITAL I O 1 9 16 V DC PWR HIGH gt 100 mS FALLING EDGE HELD 5 uS Figure 5 1 External Trigger Timing VALID EXTERNAL TRIGGERS SCAN TIME i SCAN IGNORED SCAN IN PROGRESS 0015f eps 5 5 2620A 2625A Users Manual Monitor Alarm Enabled Type 2 This corresponds to the Front Panel ALAr or Computer Interface TRIGGER 2 setting When the Monitor Alarm trigger is enabled and the Monitor function is on a scan is triggered if the monitor measurement is found to be in alarm After this scan occurs a monitor measurement is again made If the monitor measurement is still in alarm another scan is triggered This pattern continues as long as the monitor channel remains in alarm Monitor alarm trigger can be used when interval scanning is enabled This feature is convenient when you want to take normal scheduled scans and also use the monitor function as a watchdog on a particular channel Whenever an alarm condition arises on that monitored channel the instrument automatically takes additional scan measurements If you change the Monitor function to a differen
160. n from the front panel and Chapter 4 for computer interface operation the instrument is far more powerful than suggested in Chapter 2 Chapter 3 Operating the Instrument from the Front Panel Describes all capabilities available through front panel control The features introduced in Chapter 2 are described more fully including descriptions for setting up and using each type of measurement input volts thermocouple etc and digital input Totalizer etc or output such as alarms Other features of the Hydra Series Data Acquisition Unit and the Hydra Series II Data Logger are also more fully explained Chapter 4 Using the Computer Interface Describes connecting the instrument to a terminal or host computer and operating the instrument over the RS 232 Interface For the Hydra Series Data Acquisition Unit only use of the optional IEEE 488 Interface is also described here This chapter is detailed and requires a good knowledge of instrument operation via the front panel see Sections 2 and 3 Chapter 5 Additional Considerations Provides detailed operating information not provided elsewhere This chapter also describes instrument operation for the advanced user This chapter is written with the assumption that you have full knowledge of instrument operation from the front panel Chapter 3 Chapter 6 Maintenance Provides performance tests suitable as acceptance testing procedures and routine maintenance information Ref
161. n the range from 0 through 3 or an Execution Error is generated These settings affect every channel they cannot be set for each channel individually If this command is attempted when measurements active an Execution Error results Bit Number Value Meaning 0 0 1 F 1 0 Disable open thermocouple detection 1 Enable open thermocouple detection TEMP_CONFIG Temperature Configuration Query Response to this query corresponds to settings made with the TEMP_CONFIG command as follows Bit Number Value Meaning 0 0 1 F 1 0 Disable open thermocouple detection 1 Enable open thermocouple detection TIME Set the instrument clock TIME lt hours gt lt minutes gt hours 0 23 24 hour scale 18 00 6 00 pm minutes 0 59 Invalid values generate an Execution Error Seconds are automatically set to 00 with the TIME command TIME_DATE Retrieve Time and Date Returns comma separated integer values for time date and year as maintained by the instrument clock These returned values use the TIME and DATE command integer formats as follows hours 0 23 minutes 0 59 seconds 0 59 month 1 12 day 1 31 year 00 99 Seconds are returned but cannot be set other than to 00 Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont TOTAL Set Totalizer Count Give the Totalizer count a new initial value T
162. nabled Memory Storage Memory Storage is only available with the Hydra Series II Data Logger Initiate the Memory Storage setup by selecting MODE EFt rin Now refer to Table 3 17 Select the scan data destination dESt in right display as StorE for memory storage only or both for simultaneous storage and printing Then select the mode MOde in right display from ALL ALAr or trAnS left display Once the destination and mode have been set enable Memory Storage by pressing The PRN annunciator lights to indicate that Memory Storage is enabled Front panel controls allow you to send memory contents over the RS 232 computer interface to a printer Retrieval can also be made through the RS 232 computer interface for data storage that has been accomplished either from the front panel or through the computer interface A Warning No data will be saved unless the prn annunciator is lit on the hydra series ii front panel florescent display For memory clearing refer to Table 3 18 You can clear scan data memory by holding pressed while momentarily pressing and answering YES in the left display as appears in the right display The instrument must be in Active or Inactive Mode you cannot clear memory from Configuration Mode The F annunciator is dimly lit when the logging storage is nearly full more than 1800 scans have been stored The F annuciator is brightly lit when the logging storage is full
163. nfiguration Mode ALARM annunciation and evaluation follow these rules 1 When any channel reading from the latest scan is in alarm but the presently displayed channel is not in alarm or a scan interval countdown is in progress ALARM annunciator is dimly lit 2 Ifthe presently displayed channel i e the Monitor or the Review array Last channel is in alarm ALARM annunciator flashes and or Bl limit annunciator on brightly HI and or LO sense annunciator on brightly LIMIT annunciator on brightly 3 If the present channel is in alarm with a value of OL displayed OL means that a very large positive number is used for alarm evaluation OL means that a very large negative number is used for alarm evaluation 4 Ifthe present channel shows a value of otc Alarm limit checking is no longer occurring for that channel Alarm status remains as it was prior to the otc condition 5 Ifno channels are in alarm alarm related annunciators ALARM B HI LO LIMIT are off Note Alarms encountered during scan measurement can generate a low level on an assigned output If an alarm is encountered and just the monitor function is selected without the scan function the front panel will indicate the alarm but the alarm output will not change to indicate the alarm An IEEE 488 1 SRQ can also be generated when an alarm condition is set or cleared Resetting Alarm Conditions When review values a
164. ng and operating the instrument 6 15 2620A 2625A Users Manual Digital Output Test 1 Ensure that communication parameters 1 transmission mode baud rate parity and echo mode on the Hydra Series and the host are properly configured to send and receive serial data Refer to Chapter 4 2 Switch OFF power to the instrument and disconnect all high voltage inputs Remove the Digital I O ten terminal connector from the rear of the instrument and all external connections to it Connect short wires to be used as test leads to the ground and 0 through 7 terminals Leave the other wire ends unconnected at this time Reinstall the connector 4 Switch power ON to both Hydra Series II and the host Verify that Hydra Series II is not scanning If Hydra Series II is scanning press SCAN to turn scanning off then cycle power off on again 5 Using a digital multimeter DMM verify that all digital outputs 0 7 are in the OFF or HIGH state This is done by connecting the low or common of the multimeter to the ground test lead and the high of the multimeter to the digital output and verifying a voltage greater than 3 8V dc 6 Using either a terminal or a computer running a terminal emulation program set up Hydra Series II to turn Digital Outputs ON LOW state In sequence send the following commands to Hydra Series II and measure that the correct Digital Output line transitioned LOW measures less than 0 8V dc DO_LEVEL 0 0
165. ng the Computer Interface 4 Using the RS 232 Computer Interface 5 Press or Y to scroll to odd even or no parity respectively Press to select the displayed parity 6 Echo now appears in the right display with On or OFF appearing on the left display When Echo is On each character sent to the instrument over the RS 232 interface 1s echoed back to the host If Echo is OFF commands are not echoed Press Y or to select echo On or OFF Then press to accept the displayed setting Autoprint and Memory Storage RS 232 Instrument measurements can be automatically sent to an RS 232 serial printer Autoprint or to internal Memory Storage Both the Hydra Series II Data Acquisition Unit and the Hydra Series II Data Logger have the Autoprint function only the Hydra Series II Data Logger has internal Memory Storage Note During Autoprint operations consider setting the instrument echo mode to OFF Although Autoprint does operate when echo mode is on the OFF setting prevents mixing of echoed command characters with autoprinted data Autoprint can be controlled from the front panel or over the RS 232 interface Setting up storage into and retrieving data from memory in the Hydra Series II Data Logger can be controlled either from the front panel or over the RS 232 interface Refer to Chapter 3 for front panel operation The stored data cannot be viewed from the front panel data must be requested
166. nisms Setting up a Channel Channel set ups are made in Configuration Mode which must be entered from Inactive Mode If the instrument is in Active Mode turn the Scan and or Monitor function off before proceeding Follow the steps below to change the channel setup More detailed instructions for setting all instrument parameters are provided in Chapter 3 During the following steps note that some items on the display are brightly lit and others are dimly lit The bright item is intended to focus your attention on the choice the instrument is offering you at that moment Note Press W to exit the channel setup menu at any time leaving the old setup unchanged Overview Setting up a Channel Select a channel to set up Look for the desired channel number in the right display Press the following buttons to change the setup SET and FUNC come on bright along with the present setting for measurement function A Cycle through the choices for measurement function Accept your choice of measurement function For resistance measurements continue on with steps 3 and 4 For temperature measurements skip to step 5 For volts ac volts resistance or frequency the instrument now provides a choice of measurement ranges Press the buttons as follows Cycle through the choices Accept your choice For dc volts ac volts or frequency the configuration is now complete for this channel Th
167. nnel Note Temperature units can be displayed in degrees Celsius C or Fahrenheit F To switch this setting between C and F start with the instrument powered off then press and hold while pressing POWER ON The setting can also be changed through the Computer Interface with the TEMP_CONFIG command refer to Chapter 4 RTD temperature measurement uses a resistance temperature detector RTD RTDs while usually larger and more expensive than thermocouples are frequently used where accuracy stability and repeatability are important The resistance of an RTD varies directly with the sensor temperature Passing a current through this resistance generates a proportional voltage that can be accurately translated into a temperature reading The instrument supports the DIN IEC 751 RTD type Setting Alarms Alarm Limits Note If you press for a channel that is OFF an error beep will result Therefore for a new channel use to define the channel s measurement function before selecting sv Two alarm limits and B can be defined for each analog input channel An alarm occurs when the measured value on the channel moves above the HI value or below the LO value With the desired channel already selected from Inactive Mode verify or change these limits using the procedure shown in Table 3 7 If necessary refer to Entering and Changing Numeric Values for a more detailed description of the number changing technique used here
168. nnels to which no sensor has been connected Press to scroll through other channels and take additional measurements Note that the instrument automatically skips over channels that are not set up 1 those channels still set to OFF Press to deactivate the Monitor function when you re through toggles the Monitor function on and off Next press to activate the Scan function The Scan annunciator comes on and the instrument begins taking measurements on all the channels you ve set up When the scan completes the instrument normally then counts down the time interval remaining until the next scan is due the countdown appears on the right display However if you performed a Configuration Reset then the scan interval has been set back to 0 00 00 Under this condition the instrument performs continuous scanning Subsequent sections of the manual explain how to change the scan interval Even with the scan function on you can still use the Monitor function to watch a channel Press to activate the Monitor function Press A V to change the monitor channel as desired The instrument continues to take scan measurements in the background Press to deactivate the Monitor function when you are through Similarly press to deactivate the Scan function when you are through Viewing Minimum Maximum and Last Data Values While taking scan measurements the instrument also collects Minimum Maximum and Last
169. not possible to set the Fluke Data Acquisition Unit address outside the specified range 3 A description of when a user initiated address change is recognized by the device An address change is recognized when set via the IEEE setup menu which is entered by pressing COMM sft Ist This address will be used until it is changed The address change is recognized after ENTER is pressed to accept the address shown on the display 4 description of the device setting at power on Section 5 12 Any commands which modify the power on settings shall also be included The initial power up device setting is Channels 0 20 OFF C 1 2620A 2625A Users Manual C 2 Measurement rate Slow Scaling 1 all channels Offset 0 all channels Alarm parameters Limit 1 and Limit 2 OFF All limit values 0 Alarm assignments Channels 0 3 assigned to outputs 0 3 respectively Channels 4 20 assigned to digital I O lines 4 7 as shown in Table 3 8 Scan interval time 0 00 00 continuous Review values MIN MAX LAST cleared for all channels Digital lines high non alarm Totalizer 0 with debounce disabled Autoprint Memory Storage OFF RTD RO parameter 100 00 all channels Open Thermocouple Detection OTC enabled A description of message exchange options The size and behavior of the input buffer The input buffer size is 350 bytes If the input buffer fills the IEEE 488 1 bus will be held off unt
170. nsfer of measurement and configuration settings to and from the instrument e Hydra Logger Package order separately Hydra Logger model 2635A 901 is a Windows based package that allows complete set up and data collection and data conversion from up to 2 Hydra units Logger communicates over the RS 232 port on a personal computer and may be used with telephone modems Hydra Logger with Trending model 2635A 902 includes a comprehensive trending package that simulates a chart recorder A brochure with complete details is available IEEE 488 Interface Assembly Model 2620A 05 includes an IEEE 488 Interface Commands for the IEEE 488 interface are virtually identical to those used with the RS 232 Interface If your Hydra Series II Data Acquisition Unit does not have an IEEE 488 Interface a field installable kit 2620A 05K is available The Hydra Series II Data Logger cannot be equipped with an IEEE 488 Interface Connector Set 2620A 100 The 2620A 100 is a complete set of input connectors one Input Module and two Digital I O Connectors These connectors allow for additional wiring setups so that a single Hydra Series II Data Acquisition Unit or Data Logger can then be moved among multiple installations 2620A 2625A Users Manual Table 1 1 Hydra Features Channel Scanning Can be continuous scanning scanning at an interval time single scans or triggered internal or external scans Channel Monitoring Make measurement
171. nstalled 5 32 Instrument configuration corrupted 6 64 EEPROM instrument configuration bad 7 128 EEPROM calibration data bad 8 256 A D bad or not installed 9 512 A D ROM test failed 10 1024 A D RAM test failed 11 2048 A D self test failed 12 4096 Memory RAM test failed 2625A only WAI Wait to continue This command is accepted by Hydra but has no effect WAI is required by the IEEE 488 2 standard but is non operational in Hydra 4 27 2620A 2625A Users Manual 4 28 Table 4 8 Command and Query Reference cont ALARMS Active Alarms Query Returns alarm status for the indicated channel s The value returned represents data from the most recent scan The most recent scan is the scan in progress or if scanning is not in progress the last completed scan ALARMS channel channel 0 20 If the channel specification field is left blank values for all defined channels are returned values for channels defined as OFF are not included An Execution Error results if a request is made for a channel defined as OFF the channel specified is invalid no scan measurements have been made or review values have been cleared Data is returned as comma separated integer values indicating which limits were in alarm when last scanned The returned values are interpreted as follows O neither limit is in alarm and or alarm s not defined 1 Limit 1 in alarm 2 Limit 2 in alarm 3 Limit 1 and Limit 2 in ala
172. nt Open the Input Module and connect test leads to the H high and L low terminals of channel 1 Install the Input Module back into the instrument Reconnect power and switch the instrument ON Connect the test leads from the Input Module to an 820 ohm resistor Select the temperature and K type thermocouple function for channel 1 Press MON The value displayed should approximate the ambient temperature SOO e Replace the 820 ohm resistor with a 4 kilohm resistor to simulate a high resistance or open thermocouple 9o Verify a reading of otc 9 The Open Thermocouple Response Test is complete However if you desire to perform this test on any other Input Module channel 2 through 20 repeat steps 1 through 8 substituting in the appropriate channel number 6 13 2620A 2625A Users Manual RTD Temperature Accuracy Test The following two RTD Temperature Accuracy Tests are different in that one uses a Decade Resistance Source and the other uses an RTD Only one of the tests need to be performed to assure operation RTD Temperature Accuracy Test Using Decade Resistance Source Assure Channel 0 s Accuracy Verification Test for DC Volts and 300 Ohm Resistance Range meets minimum acceptable levels 1 Switch OFF power to the instrument and disconnect all high voltage inputs 2 Remove the Input Module from the rear of the instrument Open the Input Module and connect a pair of test leads keep as short as possible to the
173. nt and at any frequency between 45 and 440 Hz However the instrument is warranted to meet published specifications only at 50 60 Hz Front Rear Panel Features 2 4 The Front Panel shown in Figure 2 2 provides a two terminal input for channel 0 a multipurpose display and a set of control buttons The display includes the following elements e A major numeric chapter called the Left Display See Figure 2 3 e auxiliary alphanumeric chapter called the Right Display See Figure 2 4 e A set of Display Annunciators See Figure 2 5 and Table 2 1 The buttons control all instrument operations channel configuration instrument configuration measurement functions and print communications selections The buttons are introduced in this chapter with a more detailed description following in Chapter 3 The Rear Panel shown in Figure 2 6 provides input and output connections power input measurement input digital input output Totalizer input alarm output and computer interface connections These connections are introduced in this chapter and explained in greater detail in subsequent chapters of this manual Inputs and outputs are described with their related functions Measuring DC Voltage Totalizing etc in Chapter 3 RS 232 and IEEE 488 Computer Interface connections are detailed in Chapter 4 Overview Setting Up the Instrument REVIEW MAX REM SCAN SET FUNC LAST MIN AUTO MON Mx B ALARM 11 E EL LL VAC
174. nted here are applicable within the conditions listed in the Environmental chapter The specifications state total instrument accuracy following calibration including A D errors Linearization conformity Initial calibration errors Isothermality errors Relay thermal emf s Reference junction conformity Temperature coefficients Humidity errors Sensor inaccuracies are not included in the accuracy figures Accuracies at Ambient Temperatures Other Than Specified To determine typical accuracies at temperatures intermediate to those listed in the specification tables linearly interpolate between the applicable 0 to 60 C and 18 C to 28 C accuracy specifications Response Times Refer to Typical Scanning Rate and Maximum Autoranging Time later in this Appendix A 1 A 2 2620A 2625A Users Manual DC Voltage Inputs Range Resolution Slow Fast 300 mV 10 uV 0 1 mV 3V 0 1 1 mV 30 V 1mV 10 mV 300 V 10 mV 0 1V Accuracy x 96 V Range 18 C to 28 C 0 C to 60 C 90 Days Slow 1 Year Slow 1 Year Fast 1 Year Slow 1 Year Fast 300 mV 0 018 20 uV 0 023 20 uV 0 040 0 2 mV 0 067 20 uV 0 084 0 2 mV 3V 0 01996 0 2mV 0 02496 0 2mV 0 041 2 0 065 0 2 mV 0 082 2 mV 30V 0 019 2 mV 0 02496 2mV 0 041 20 mV 0 086 2 mV 0 103 20 mV 150 300V 0 019 20 mV 0 024 20 mV 0 041 0 2V 0 087 20 mV 0 104 0 2V Input Impedance 100 minimum in
175. ntering a numeric value Press to set the scan interval Now try pressing gt 4 a few times to select different digits The selected digit is always brightly lit For any digit press or WV to change the value Refer to Table 3 10 for details of setting the scan interval Operating the Instrument from the Front Panel Instrument Configuration This number editing technique occurs during Configuration Mode operations whenever you are setting a numeric value Instances of number editing include the following e RO RTD Table 3 6 e Alarms Table 3 7 e Scaling Table 3 9 e Scan Interval TimeTable 3 10 e Time Date Table 3 13 Selecting Scan Interval The scan interval is the period between starts of measurement scans The resolution of the scan interval is one second the maximum scan interval is 9 hours 99 minutes 99 seconds The format of the scan interval is x xx xx 1 30 45 translates to 1 hour 30 minutes and 45 seconds If scan interval of 0 00 00 is specified continuous scanning will occur when the Scan function is activated If more than a few seconds are required to scan all defined channels a short scan interval a few seconds effectively becomes continuous scanning If the Monitor function is turned on when the instrument is continuously scanning a Monitor channel measurement is still taken between each scan Table 3 10 illustrates the button sequence used for setting scan interval If necessa
176. of stop bits cannot be set Refer to Figure 4 1 For the instrument and host to communicate via the RS 232 interface the communication parameters of the instrument must match those of the host RS 232 communication parameters can be set only from the front panel If the communication parameters of the host and the instrument do not match proceed as follows to select the appropriate baud rate and parity parameters for the instrument summarized in Table 4 1 Parity or Odd START 7 Bit Data PARITY STOP Parity No START 8 Bit Data STOP Figure 4 1 Data Stop Bits 0011f eps Table 4 1 RS 232 Setup Baud Parity Echo Note Press COMM A these GH usr buttons To select IEEE Odd OFF from 300 E On these 600 no choices 1200 2400 4800 9600 Note If IEEE is selected here 2620A only the RS 232 setup sequence is exited and the IEEE setup sequence is begun Refer to Table 4 3 1 Select COMM Gut 2 The baud rate presently selected is now shown in the left display and bAUd is shown in the right display If IEEE appears press until a baud number appears 3 Press or V to scroll to the desired baud 9600 4800 etc but not IEEE Press to select the displayed baud rate 4 PAR appears in the right display The parity selection Odd E or no is now shown in the left display 4 4 Usi
177. or a known time period The measurement represents the frequency observed during the sampling time The instrument can measure a wide range of frequency inputs Test applications might include measuring line voltage sine wave signals or measuring the output of a voltage to frequency converter used in a servo system Thermocouple temperature measurements can be made using linearizations for the following nine standard thermocouples J K E T N R S B C You specify what type of thermocouple is connected to the channel The reference temperature sensor is built into the Input Module The instrument applies compensation automatically for thermocouple channels Open thermocouple detection is indicated by otc in the left display The thermocouples are further described in Table 3 14 Table 3 2 DC Voltage AC Voltage Function Range phannel DC or AC Note PRESS THESE Func BUTTONS 02 A m TO 0 OFF Auto Completes SELECT 1 VDC 300 00 mV Selection FROM V AC 3 0000V and returns THESE Q 30 000V to Inactive CHOICES Hz 150 00 V Mode 20 C or F 300 00 CH 0 1 and 11 Note Determine the highest ac or dc voltage value anticipated for this channel Then select a range large enough to accommodate this value If the highest voltage cannot be anticipated select Auto 3 6 Operating the Instrument from the Front Panel Channel Configuration Table 3 3 Resistance PRESS THESE TO SELECT
178. orarily set M to 1 and B to 0 verify that the measurements are returning values in the expected range Unexpected measurements could result from a wiring error or the wrong range function being selected 3 13 2620A 2625A Users Manual Table 3 9 Mx B Selection Channe Sign M Decimal Multiplier 1 Value Point Note 1 Position PRESS A THESE 7 BUTTONS 4 4 4 gt gt gt TOSELECT 0 0000 0000 0 m Continue to FROM 000 00 x1 B value THESE 1 00 000 k below CHOICES 0 0000 20 Sign Decimal Multiplier Value Point Note 1 Position PRESS A THESE W BUTTONS 4 4 4 gt gt gt TO SELECT 0000 0000 0 m FROM 000 00 THESE 00 000 k CHOICES 0 0000 M Note 1 Multiplier definitions m 001 x1 1 0 k 1000 M1000000 Note 2 If your press while setting the M value anytime prior to showing the B value no changes entered thus far are stored If you press while setting the B value changes to M are stored and changes to B are discarded in either case the instrument returns to Inactive Mode Instrument Configuration Entering and Changing Numeric Values Use the arrow buttons to enter or change a numeric value Use gt and 9 to select the digit to change The selected digit is brightly lit Use and to change the value for that digit Setting the scan interval provides a good example of e
179. ormat Returns the format presently in use The default IEEE 488 2 compatible No measurement units are allowed Responses are RS 232 compatible allowing a means of recording the units with the measurement value FUNC Channel Function Definition Define the measurement function and range for the indicated channel Attempting to use the FUNC command when measurements are active results in an Execution Error Note Successful execution of the FUNC command clears any alarm limits and scaling values for this channel Therefore you must define a channel s function before setting alarm limits and or scaling values for that channel Also the FUNC command clears all values in the Review array FUNC channel OFF FUNC lt channel gt lt VAC VDC FREQ gt lt range gt FUNC lt channel gt lt OHMS gt lt range gt lt terminals gt FUNC lt channel gt lt TEMP gt lt thermocouple type FUNC lt channel gt lt TEMP gt lt PT gt lt terminals gt lt channel gt 0 20 If the channel number is invalid an Execution Error is generated lt function gt VAC VDC OHMS FREQ TEMP OFF If the function is OFF any additional supplied parameters generate a Command Error lt range gt AUTO 1 6 Thermocouple RTD_type Ranges for VAC VDC OHMS and FREQ are listed in the following table Enter AUTO to select autoranging Use of any other values causes an Execution Error RANGE VOLTAGE OHMS FREQUENCY 1 300 mV 3000
180. ors RS41 Modem with DB 9 female and DB 25 male connectors RS42 Null modem with DB 9 female and DB 25 male connectors RS43 Null modem with DB 9 female and DB 9 female connectors Cables from other sources may be used or cables can be fabricated based on the figures in this appendix The RS40 and RS42 cables are identical except for the DB 25 connectors female and male respectively Some interfaces allow a selection of cables F 1 2620A 2625A Users Manual For example connection to a serial to parallel converter when using a printer with a parallel input may be as a DTE cable RS42 or DCE cable RS40 HYDRA Reis PC DTE gt n DTE DB 9 MALE DB 9 MALE HYDRA DTE gt n Q x v DTE DB 9 MALE DB 25 MALE HYDRA MODEM DTE X o 5 DCE DB 9 MALE MODEM DB 25 FEMALE HYDRA PRINTER DTE n DTE DB 9 MALE DB 25 FEMALE HYDRA SERIAL TO PARALLEL DTE OTE DB 9 MALE DB 25 FEMALE HYDRA Rea SERIAL TO PARALLEL DTE gt PN V A DCE PRINTER DB 9 MALE MODEM DB 25 FEMALE KEY DTE DATA TERMINAL EQUIPMENT DCE DATA COMMUNICATIONS EQUIPMENT gt MALE gt FEMALE 0071f eps Figure F 1 Summary of RS 232 Connections Appendices RS 232 Cabling F RS43 CABLE NULL MODEM bd RS 232C
181. ot be overwritten with the IEEE 488 interface The following are valid terminators for the RS 232 interface LF Line Feed CR Carriage Return CR LF LF CR The following are valid terminators for the IEEE 488 interface e EOI End or Identity on any character e LF Line Feed In some instances a terminator is automatically transmitted by the host at the end of the command string 1 the instrument s input string For example in Fluke BASIC the PRINT statement finishes with a CR LF pair Typical Inout Strings Example strings that could be sent to the instrument over either IEEE 488 interface are shown in Figure 4 3 Using the Computer Interface General Information RS 232 and IEEE 488 FUNC 1 OHMS 3 2 Select ohms function for channel 1 Select 30 kilohm range Select 2 wire 2T connections FUNC 12 TEMP K Select temperature measurement for channel 12 Select K type thermocouple input FUNC 1 TEMP PT 2 RTD_RO 12 101 22 Select temperature measurement for channel 1 Select RTD DIN IEC 751 Select 2 wire 2T connections Set new RO value for channel 12 INTVL 0 10 0 SCAN 1 LAST Set interval between scan starts to 10 minutes Start scanning Return measured values for all scanned channels 0013f eps Figure 4 3 Typical Input Strings 2620A 2625A Users Manual Sending Numeric Values to the Instrument RS 232 and IEEE 488
182. ou are now ready to operate the instrument over the RS 232 interface Installation Test The procedure below demonstrates the instrument processing a computer interface command and at the same time confirms that the instrument has been properly set up and cabled for computer interface operations 1 Ask for the instrument identification by sending the following query IDN lt CR gt 2 Verify that the instrument sends either of the following responses FLUKE 2620A 0 Mn n An n Dn n gt FLUKE 2625A 0 Mn n An n Dn n gt Mn n identifies the main software version An n identifies the A D software version Dn n identifies the display software version The RS 232 prompt gt means that the command has been executed and the instrument is ready to accept another command RS 232 Information Character Echoing With the RS 232 interface characters sent to the instrument can be automatically echoed back to the host When Echo is set On characters sent to the instrument are echoed back to the host With Echo OFF characters are not echoed back To set the Echo parameter refer to the procedure earlier in this chapter under Setting Communication Parameters RS 232 Character Deletion Characters sent directly from a host to the instrument can be deleted by pressing the DELETE or lt BACKSPACE gt key Backspaces are echoed to the host if Echo is Device Clear Using Ctrl C 4 8 CTRL C is the RS 232 equ
183. owing at the host INIT PORT 0 lt CR gt CLEAR PORT 0 lt CR gt PRINT lt address of instrument gt IDN lt CR gt INPUT LINE lt address of instrument gt A lt CR gt PRINT A lt CR gt 1 Verify that the instrument sends the following identification response FLUKE 2620A 0 Mn n An n Dn n Mn n identifies the main software version An n identifies the A D software version Dn n identifies the display software version If the instrument does not respond to the test procedure as indicated make the following checks 1 Check all cable connections 2 Check that the interface has been properly enabled and addressed General Information RS 232 and IEEE 488 How the Instrument Processes Input The following paragraphs summarize how the instrument processes input that is received from a host or stand alone terminal Note In this manual input means a string sent to the instrument from a host Output means a string sent from the instrument to the host 4 13 2620A 2625A Users Manual Input Strings The instrument processes and executes valid input strings sent by the host A valid input string is one or more syntactically correct commands separated by semicolons followed by an input terminator ASCII and IEEE 488 bus codes are provided in Appendix B The instrument stores received input in a 350 byte input buffer Note Input strings received over the RS 232 interface are not executed or ch
184. pecification made undefined OFF channels are not included For each defined channel a separate signed number with decimal point and exponent is returned Commas separate numbers for different channels and no blank spaces are included Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont LOCK Lock the instrument front panel so that only use of the arrow keys and the simultaneous use of and are recognized The following LOCK commands are recognized Unlock Lock and begin review If the instrument is not in review a review is begun even if there are no defined channels Monitor lock If the instrument is not already in monitor an Execution Error is generated The three LOCK states are non volatile If power is interrupted the instrument retains the last LOCK setting LOCK Retrieve instrument front panel lock status 0 1 or 2 is returned identifying the state set with the LOCK command LOCS Local without Lockout RS 232 only Enter the IEEE 488 1 local without front panel lockout LOCS state All front panel buttons are enabled and the REM annunciator is not lit This is the state assumed by the instrument at power up reset If this command is used with the IEEE 488 interface an Execution Error is generated LOG Retrieve Logged Data Query RS 232 only Return the oldest logged scan values for all configured channels and remove them from storage
185. put of 300V dc or ac However the maximum input for all other channels can only be 150V dc or ac 10 With the exception of the selected voltage range and input voltage from the 5700A repeat steps 1 through 9 for each remaining Input Module channel 2 through 20 Channels 2 through 10 and 12 through 20 should be configured for the 150V dc range and an input voltage of 150 volts 6 7 2620A 2625A Users Manual Table 6 3 Performance Tests Voltage Resistance and Frequency Display Accuracy Function Range Input Level Frequency 1 year 18 28 C MIN MAX ocvae 300 002 002 300 mV 150 mV 149 94 150 06 300 mV 290 mV ios 289 91 290 09 3V 2 9V ase 2 8991 2 9009 3V 2 9V T 2 9009 2 8991 30V 29V 25 28 991 29 009 150 150 149 94 150 06 300V 290V pen 289 91 290 09 Note Voltages greater than 150V can only be applied to channels 0 1 and 11 Soom ike 19 71 20 29 300 mV 20 mV 100 kHz 18 50 21 50 300 mV 290 mV 1 kHz 289 28 290 72 3V 290 mV 100 kHz 275 00 305 00 3V 2 9 1 kHz 2 8937 2 9063 30V 29V 1kHz 28 931 29 069 150V 150V 1kHz 149 54 150 46 300V 290V 1kHz 289 34 290 66 Note Voltages greater than 150V only be applied to channels 0 1 and 11 The rear Input Module must be installed when measuring ac volts on channel 0 Note For 2 terminal measurements the resistance accuracy given in this table applies to Channel 0 and makes allowance fo
186. put returns to high scanning is disabled If scanning is already enabled the external trigger requests a single scan This request is ignored if a scan is presently in progress Alarm 2 signifies that an alarm condition on the monitor channel triggers a single scan When the scan is completed the Monitor function is resumed This cycle repeats as long as the alarm condition is encountered on the monitor channel The external trigger input is disabled The TRG and GET commands can still be used If the type given is not one of the listed values an Execution Error is generated 4 45 2620A 2625A Users Manual Table 4 8 Command and Query Reference cont TRIGGER Trigger Type Query Returns an integer representing the present trigger type 0 off 1 on 2 alarm 4 46 Chapter 5 Additional Considerations Tntroductio mE ER Measurement Rate Advanced Trigger Mechanisms eese eren nennen Front Panel Trigger Control esee Computer Interface Trigger Control eee Both External and Monitor Alarms Disabled Type 0 External Trigger Enabled Monitor Alarm Enabled Type 2 seen Thermal Voltages ederent ie tete When Measuring Resistance or Temperature RTD
187. r 50 C to 60 C for the 300 3 MQ and 10 ranges Appendices Specifications A Altitude Operating 2 000 m maximum Non operating 12 200 m maximum Vibration 0 7 gat 15 Hz 1 3 g at 25 Hz 3 g at 55 Hz Shock 30 g half sine per Mil T 28800 Bench handling per Mil T 28800 General Channel Capacity 21 Analog Inputs 4 Alarm Outputs 8 Digital I O inputs outputs Measurement Speed Slow rate 4 readings second nominal Fast rate 17 readings second nominal 1 5 readings second nominal for ACV and high Q inputs For additional information refer to Typical Scanning Rated and Maximum Autoranging Time Memory Life 10 years minimum over Operating Temperature range Stores real time clock set up configuration and measurement data Common Mode Voltage 300V or ac rms maximum from any analog input channel to earth provided that channel to channel maximum voltage ratings are observed Voltage Ratings Channels 0 1 and 11 are rated at 300V dc or ac rms maximum from a channel terminal to earth and from a channel terminal to any other channel terminal Channels 2 to 10 and 12 to 20 are rated at 150 dc or ac rms maximum from a channel terminal to any other channel terminal within channels 2 to 10 and 12 to 20 IEC Overvoltage Category II Size 9 3 cm high 21 6 cm wide 31 2 cm deep Weight Net 2 95 kg Shipping 4 0 kg A 15 2620A 2625A Users Manual Power to 264V
188. r of the instrument and all external connections to it Connect short wires to be used as test leads to the 0 terminal and the Total terminal Leave other ends of wires unconnected at this time Reinstall the connector 4 Switch ON power to both Hydra Series II and the host 2620A 2625A Users Manual 10 11 Press the TOTAL button on the front panel of Hydra Series II Assure Hydra Series displays a 0 value Jumper output 0 to the Total 1 input by connecting the 5 terminal test lead to output 0 s test lead Using either a terminal or a computer running a terminal emulation program set up Hydra Series II to toggle turn ON and OFF Digital Output 0 In sequence send the following commands to Hydra Series II and assure Hydra Series measures and displays the correct total value DO_LEVEL 0 0 lt CR gt DO_LEVEL 0 1 lt CR gt Assure Hydra Series II displays a totalizer count of 1 Again in sequence send the commands DO_LEVEL 0 0 lt CR gt DO_LEVEL 0 1 lt CR gt A totalizer count of 2 should now be displayed Repeat step 8 for each incremental totalizing count Set the Hydra Series totalized count to a value near full range 65535 and test for overload Send the following commands to Hydra Series II TOTAL 65534 lt CR gt DO_LEVEL 0 0 lt CR gt DO_LEVEL 0 1 lt CR gt A totalizer count of 65535 should be displayed Send DO_LEVEL 0 0 lt CR gt DO_LEVEL 0 1 lt CR gt Hydra Series
189. r remote control without local lockout REMS Used to accept a selection just made in any setup menu sed to exit setup menu and return to Inactive Mode without saving settings you ve v Used to exit set d return to Inactive Mode without saving setti selected thus far Exceptions exist under the following two conditions e If you cancel out of the alarm menu part way through defining alarm limit B any just made entries for alarm limit will still take effect e f you cancel out of the Mx B menu partway through defining the B value any just made changes to the M value will still take effect This button also provides a handy way to remove the Totalizer value or Review data from the display Turns the Scan function on or off triggers a single scan when the instrument is under remote control without lockout REMS 2620A 2625A Users Manual 2 12 Table 2 2 Front Panel Pushbuttons cont INTVI 2 z z 5 LIST a 2 9 Z gt m LOCAL surr RATE Gu CLOCK xT MODE GH priv CLEAR Review COMM usr ZERO SINGLE FT scan TRIGS ferr Turns the Monitor function on or off Allows you to change the scan interval Scanning becomes continuous when the interval is set to 0 00 00 Enables disables logging measurements to the printer Autoprint RS 232 only or to internal data memory Memo
190. r settings channel function alarm values Mx B scaling values scan interval trigger type etc are being examined or changed When in the Configuration Mode the SET annunciator is on along with other annunciators indicating the parameter s being set Inactive Mode The instrument is in Inactive Mode when no measurement functions are enabled and no instrument settings are being examined or changed This is a quiescent state only summary channel information is displayed Turning the Instrument On Turn the instrument on by pressing POWER on the lower right of the front panel Initially the entire display lights while the instrument conducts several internal self tests Note You can familiarize yourself with the instrument by holding the display fully lit Press and hold then press ON and wait a moment for the instrument to beep Then release The entire display will now stay on until you press any button the power up sequence then resumes A deviation in mainframe software Version 5 5 will not allow the display to remain ON Versions 5 4 and below will allow the display to remain ON Any error conditions are momentarily displayed during this test sequence Even in the presence of an error the instrument still attempts to complete the self test sequence and begin normal operation However if you encounter an error note the number and refer to Self Test Diagnostics and Error Codes in Chapter 6 for additional information Once the s
191. r the channels measured This measurement data is returned as a list of values in scientific notation format e State of the Digital I O lines and totalize count at the time the channels were scanned The state of the digital I O lines may reflect evaluation of alarms for this set of scan measurements Alarm outputs and digital I O values are returned as integer values The Totalizer value is returned as a scientific notation value Data for a specific scan can be retrieved with the LOGGED lt index gt query The lt index gt parameter can be 1 through 2047 signifying the number of the scan Scan data is not removed from memory with this query The number of stored scans can be retrieved with LOG_COUNT Memory Full Operation If Data Logger memory is full two methods of handling additional scan data are available With the LOG_MODE 0 command older scans are written over by newer scans on a first in first out basis Therefore the instrument can continue to make scans until a certain event occurs and storage of all data leading up to the event is assured With the LOG_MODE 1 command new scans are stored only when memory is available All data following a specific event e g an alarm can thereby be saved Memory can be made available in one of the following two ways e LOG command clears each scan as it is read Memory Clear Front Panel or LOG CLR removes all scans The LOG MODE setting is non volatile and cannot be changed f
192. r the instrument to beep then release SHIFT The entire display will now stay on until you are ready to deactivate it 3 Atthe end of the activation period press any button on the front panel the instrument resumes the mode in effect prior to the power interruption Active or Inactive Service 6 22 If the instrument fails check that operating instructions presented earlier in this manual are being followed If the problem cannot be remedied forward the instrument postage paid to the nearest Fluke Service Center Be sure to pack the instrument securely use the original container if available Include a brief description of the problem Fluke assumes NO responsibility for damage in transit To locate an authorized service center visit us on the World Wide Web or call Fluke using any of the phone numbers listed below 1 800 44 FLUKE 1 800 443 5853 in U S A and Canada 31 402 678 200 in Europe 8 1 3 3434 0181 Japan 65 276 6196 Singapore 1 425 356 5500 in other countries Appendices Appendix Title A SPCCHICAtLONS A B ASCII amp IEEE 488 Bus tero EU oe ipaa IEEE 488 2 Devise Documentation D Making Mixed E Binary Upload of Logged Data LOG BIN 2625A only F 5 232 D E Appendix A Specifications Introduction The instrument specifications prese
193. r up to 0 05 ohm of lead wire resistance You must add any additional lead wire resistance present in your set up to the resistance values given in this table Resistance Using inputs in decades of 3 300 Q short 0 00 0 09 300 Q 299 90 300 15 3 kQ short 0 0000 0 0003 3 kQ 2 9989 3 0011 30 30 kQ 29 990 30 010 300 kQ 300 kQ 299 88 300 12 3 MQ 3 MQ 2 9979 3 0021 6 8 Maintenance 6 Performance Tests Table 6 3 Performance Tests Voltage Resistance and Frequency cont Using inputs in decades of 1 9 300 Q short 0 00 0 09 1900 189 93 190 12 3 kQ short 0 0000 0 0003 1 9 1 8992 1 9008 30 kQ 19 18 992 19 008 300 190 189 91 190 09 3 MQ 1 9 MQ 1 8983 1 9017 Using inputs in decades of 1 300 Q short 0 00 0 09 100 Q 99 95 100 10 3 kQ short 0 0000 0 0003 3 kQ 1 kQ 0 9995 1 0006 30 kQ 10 9 995 10 005 300 100 99 94 100 06 3 1 mQ 0 9990 1 0010 10 MQ 10 MQ 9 979 10 021 Optional test point if standards available Note All channels 0 through 20 can accommodate 2 terminal resistance measurements Channel 0 with only two connections cannot be used for 4 terminal measurements Four terminal resistance measurements can be defined for channels 1 through 10 only Channels 11 through 20 are used as required for 4 terminal to provide the additional two connections For example a 4 terminal set up on channel 1 uses
194. rd the button entry and wait for another entry Selecting a Channel The channel number appears in the right display Press or W to select a channel You can change the channel when in Inactive Mode when looking at data in the Review array or when the Monitor function is on Using the Buttons Table 2 2 presents a summary of the control buttons Special button sequences cause a total instrument Configuration Reset or change the temperature units between C and F e Holding down while turning the power on causes the instrument to perform a Configuration Reset Hold the button down until the instrument beeps indicating that the action has been taken All channels will be reset OFF All alarm and scaling values will be reset Scanning and monitoring will be turned off e Holding down while cycling POWER ON toggles the degree unit used with temperature measurements C or F Again the instrument will beep and display C or F when this action is complete Table 2 2 Front Panel Pushbuttons Calls up the menu to set the function for the channel Calls up the menu to set alarm limits Il and for the channel Calls up the menu to set scaling on the channel A 4 Used to change the channel number and to step through choices in any of the setup menus These arrow buttons have an automatic repeat action when held down for more than 1 second generates a service request when the instrument is unde
195. re cleared all alarm status is also removed This action occurs in the following instances e function is changed or set to OFF e Achannel range is changed e CLEAR revew is selected while Review array data is being examined e Configuration Reset occurs power up or RST Changing an alarm definition clears the alarm status for the changed alarm limit Using the Digital I O Lines The rear panel Digital I O Connector provides eight lines numbered 0 through 7 that are individually usable as inputs or outputs No preconfiguring for the use of these lines is necessary an input low signifies that the line is an input and an output low signifies that the line is an output Output low conditions take precedence over input low conditions Both alarm limits and for channels 0 through 3 are permanently assigned to alarm outputs O through 3 respectively on the rear panel Alarm Output Connector 2620A 2625A Users Manual At any Configuration Reset power up or computer interface RST alarm limits on channels 4 through 20 are assigned to Digital I O lines 4 through 7 in the ORed pattern shown in Table 3 8 These assignments can be changed via the Computer Interface Each limit or B for a channel can be assigned to any one digital output Table 3 8 Initial Alarm Assignments Digital I O Lines 4 Through 7 Digital Line 4 5 6 7 Assigned to Channels 4 5 6 7 8 9 10 11 12 13 14
196. red by the mercury thermometer within tolerances given in Table 6 4 plus any sensor inaccuracies The Thermocouple Temperature Accuracy Test is complete However if you desire to perform this test on any other Input Module channel 2 through 20 repeat steps 1 through 6 substituting in the appropriate channel number 2620A 2625A Users Manual 11 12 13 14 15 16 17 18 19 20 SOURCE HL HL HL HL HL HL HL HL HL HL 4 WIRE HYDRA INPUT SENSE NL HLH aL aL MODULE 4 WIRE 22 a xj 2 3 4 5 6 7 8 9 10 5700A SENSE 0019f eps Figure 6 2 4 Terminal Connections to 5700A Maintenance 6 Performance Tests 4 WIRE 4T CONNECTION 11 12 13 14 15 16 17 18 19 20 HL HL HL HL HL HL HYDRA INPUT MODULE HL 4 5 6 7 8 9 10 DECADE RESISTANCE BOX Figure 6 3 4 Terminal Connections to Decade Resistance Box 0020f eps Table 6 4 Performance Tests for Thermocouple Temperature Function IPTS 68 ITS 90 Thermocouple Type Thermocouple Accuracy Specifications 1 Year 18 28 Degrees C 0 40 C 0 44 C 0 53 0 38 C 0 45 C m Z Open Thermocouple Response Test 1 Switch OFF power to the instrument and disconnect all high voltage inputs 2 Remove the Input Module from the rear of the instrume
197. rformed from the front panel can also be performed over the computer interface Some operations like setting communications parameters for the RS 232 interface and selecting the instrument address for IEEE 488 operations can only be performed from the front panel Types of Computer Interface Only one interface can be selected or used at a time The optional IEEE 488 interface is contained on a single printed circuit assembly and can be selected if it is installed in the Hydra Series II Data Acquisition Unit The IEEE 488 interface cannot be used with the Hydra Series II Data Logger Of course the RS 232 interface can be re selected even if the IEEE 488 interface is installed If you are going to use the RS 232 interface continue reading If you are going to use the IEEE 488 interface skip to USING THE IEEE 488 INTERFACE later in this chapter Note To determine which computer interface is enabled select COMM usr If IEEE appears on the display the IEEE 488 interface is enabled Otherwise if a baud rate appears the RS 232 interface is enabled Using the RS 232 Computer Interface The RS 232 interface allows ASCII asynchronous serial communication between the instrument and a host a serial printer or a terminal 4 3 2620A 2625A Users Manual Setting Communication Parameters RS 232 Baud rate bAUd parity PAR and echo Echo parameters be set directly by the user number of data bits and number
198. rm If measurements are not active the last known value is returned The value 0 is returned for measured channels that do not have alarms defined For alarm status of all defined channels no channel specification made undefined OFF channels are not included For each defined channel an integer value 0 1 2 or 3 is returned Commas separate integers for different channels and no blank spaces are included For example if channel 1 has no alarm channel 12 has Limit 2 in alarm channel 13 has Limit 1 and Limit 2 in alarm and channel 14 has Limit 1 in alarm the return is 0 2 3 1 ALARM ASSOC Associate Alarm Output For the indicated channel and alarm limit associate the given digital output line ALARM ASSOC channel limit num DO line channel 4 20 lt limit_num gt 1 2 lt DO_line gt 0 7 Any other values or use of an invalid channel cause an Execution Error to be generated If an association already exists for the specified channel and limit executing this command revises the association When switching alarm associations the output being left switched away from is set to a high non alarm state To set multiple channels to a single DO line issue this command for each association to be made Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont ALARM ASSOC ALARM ASSOC CLR Alarm Association Quer
199. rmally protection may be impaired Do not attempt to operate it When in doubt have the instrument serviced Getting Started Introduction This section will have you operating Hydra in a matter of minutes All basic operating information is covered in this short Getting Started guide Subsequent chapters of the manual cover the instrument in more detail Note This manual contains information and warnings that must be followed to ensure safe operation and retain the instrument in safe condition The Basics Hydra has 21 input channels channel 0 is on the front panel and channels 1 through 20 are on the rear input module There are two ways Hydra takes measurements these can be used separately or together Scan function which measures all channels at a specified scan interval e A Monitor function which repeatedly measures any one channel The instrument has three different modes of operation e Active Mode when the Scan and or Monitor functions are on e Configuration Mode when of the setup parameters are being changed e Inactive mode when the instrument is powered up and sitting idle 1 not in Active Mode or Configuration Mode Turning On the Instrument Press ON The entire display lights up as the instrument steps through a series of self tests Refer to Chapter 6 if any error messages are displayed during this self test sequence When the self tests are finished the instrument resumes wh
200. rom the instrument front panel Clearing Memory Memory clearing is available with the Hydra Series II Data Logger 2625A only With the RS 232 interface active use the LOG CLR command to clear all stored Data Logger memory values Refer to Chapter 3 for the front panel version of memory clearing Cabling the Instrument to a Host or Printer RS 232 Communications with a host are handled through a DB 9 interface connector on the rear panel of the instrument Pin usage is diagramed on the instrument s rear panel and shown in Figure 2 6 Connect the instrument to the host or terminal using a cable appropriate to your application Usually total cable length should not exceed 50 feet 15 meters Longer cables are permitted if the load capacitance measured at the interface point including the signal terminator does not exceed 2500 picofarads To connect the instrument to an IBM PC AT DB 9 connector use RS40 and RS41 cables connected in series or use any other cable designed for interconnecting two IBM PC ATs The RS40 and RS41 cables are described in Chapter 1 4 7 2620A 2625A Users Manual To connect the instrument to a specific brand of RS 232 printer use the cable that would be used to connect that printer to an RS 232 port on an IBM PC AT DB 9 connector The RS42 cable is compatible with most serial printers contact Fluke for printer compatibility information Once the cable is connected turn the instrument back on Y
201. ry refer to Entering and Changing Numeric Values for a more detailed description of the number editing technique used here Table 3 10 Scan Interval Hour Minute Second PRESS INTVL gt gt gt gt THESE BUTTONS TO CHANGE 0 00 00 0 00 00 0 00 0 0 00 0 0 00 0 0 0 INDICATED DIGIT Note Go backward from SECOND to MINUTE to HOUR by pressing lt Press at any time to accept the displayed scan interval and exit scan interval selection Press at any time to exit interval selection without storing any changes Selecting the Measurement Rate The slow measurement rate provides the highest accuracy and resolution A fast rate can be selected but keep in mind that fast rate provides one less digit of resolution than does slow rate Measurement rate selection is illustrated in Table 3 11 3 15 2620A 2625A Users Manual Table 3 11 Measurement Rate Selection Press these buttons RATE gt v To select from these SLO Completes selection choices FAST and returns to Inactive Mode Triggering To set the scan triggering type from the front panel use the procedure shown in Table 3 12 Table 3 12 Trigger Type Selection Press these buttons TRIGS surr P A v To select from these OFF choices On ALAr Note The three trigger types signify OFF External triggering is disabled Sc
202. ry Storage Only the Hydra Data Logger provides internal Memory Storage Calls up the Review array of MIN MAX and LAST values to the display Calls up the present Totalizer count to the display RS 232 only Prints out the Last values of the Review array 2620A and 2625A or Data Logger memory 2625A only via the RS 232 interface Accesses secondary functions under various keys as described below When this button is pressed SHIFt appears on the right display but automatically disappears if you have not made a selection within 5 seconds or if you press V When under remote control without lockout REMS this returns control to the front panel Allows you to change the scanning speed Slo for highest accuracy or for highest throughput Allows you to set the internal day date clock Allows you to select the conditions for which scan measurements will be automatically printed or logged This button sequence clears the entire contents of the Review array Review data must be presently shown on the display to clear the array Allows you to set up a computer interface port While the Totalizer count is displayed resets the Totalizer to 0 Forces an immediate scan of all defined channels If a scan is presently in progress this new request is ignored Once begun the full scan is completed Configuration changes are not allowed while a scan is in progress Allows you to set up the auxiliary scan trigger mecha
203. ry Storage Computer Interface Control Memory Storage can be controlled from the front panel or over the RS 232 interface Refer to Chapter 3 for front panel operation Through the RS 232 interface the PRINT TYPE and PRINT commands can be used to set up and enable Memory Storage PRINT TYPE selects the destination 0 for printer 1 for Memory Storage and 2 for both and the mode used to select the scans to store 0 for ALL 1 for ALAr or 2 for trAnS PRINT sets storage on 1 or off 0 The PRINT TYPE and PRINT queries can be used to determine present settings for the PRINT TYPE destination type and PRINT commands respectively Memory Retrieval 4 6 Note The LOG query does not return channel numbers with scan data Therefore if you add or delete defined channels you may want to clear the memory contents so that subsequent LOG queries return only data for the new set of scanned channels Using the Computer Interface 4 Using the RS 232 Computer Interface Data for the oldest set of scan readings in Hydra Series Data Logger memory can be retrieved with the LOG query Each set of scan readings is cleared from memory when read with LOG The LOG query returns the following information e Date and time at the start of the logged scan Date and time are returned as integer values in the same format as used with the TIME_DATE query hours 0 23 minutes 0 59 seconds 0 59 month 1 12 day 1 31 year 00 99 e Values fo
204. s If the RS 232 interface is active you can print out the Last values from the Review array 2620A and 2625A or all values from Data Logger memory 2625A only This procedure is described in Table 3 16 In the LASt printout channels that are defined as OFF are not included Following is a sample LASt printout 3 23 2620A 2625A Users Manual 07 41 37 02 09 91 CH LAST VALUE MAX VALUE MIN VALUE 1 097 32 mVDC 098 51 mVDC 096 10 mVDC 2 0 0973 VDC 0 0985 VDC 0 0961 VDC 3 00 097 VDC 00 099 VDC 00 096 VDC 4 000 10 VDC 000 10 VDC 000 10 VDC OL mVAC OL mVAC OL mVAC 6 OL VAC OL VAC OL VAC 13 05 511 VAC 05 582 VAC 05 414 VAC 8 005 51 VAC 005 58 VAC 005 41 VAC 9 OL OHMS OL OHMS OL OHMS 10 OL kOHMS OL kOHMS OL kOHMS ks 08 276 kOHMS 08 374 kOHMS 08 231 kOHMS 12 008 28 kOHMS 008 37 kOHMS 008 23 kOHMS 13 0 0083 MOHMS 0 0084 MOHMS 0 0082 MOHMS 14 00 008 MOHMS 00 008 MOHMS 00 008 MOHMS 153 OL HZ OL HZ OL HZ 16 9 7193 kHZ 9 7239 kHZ 9 6771 kHZ 17 09 719 kHZ 09 724 kHZ 09 677 kHZ 18 009 72 kHZ 009 72 kHZ 009 68 kHZ 159 0 0097 2 0 0097 MHZ 0 0097 2 With the Hydra Series Data Logger 2625 sample Store printout of stored values for three scans would be as follows 07 41 5202 09 91 5 3 2345 mMX B12 123 87 kOHMS17 31 268VAC ALM 15DIO 255TOTAL 0 07 41 5302 09 91 5 3 2345 mMX B12 123 87 kOHMS17 31 268VAC ALM 15DIO 255TOTAL 0 07 41 5402 09 91 5 3 2345 mMX B12 123 87 kOHMS17 31 268VAC ALM 15
205. s equipment does cause interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one of more of the following measures e Reorient the receiving antenna e Relocate the equipment with respect to the receiver e Move the equipment away from the receiver e Plug the equipment into a different outlet so that the computer and receiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington D C 20402 Stock No 004 000 00345 4 Declaration of the Manufacturer or Importer We hereby certify that the Fluke Model 2620A Data Acquisition Unit and 2625A Data Logger are in compliance with BMPT Vfg 243 1991 and is suppressed The normal operation of some equipment e g signal generators may be subject to specific restrictions Please observe the notices in the users manual The marketing and sales of the equipment was reported to the Central Office for Telecommunication Permits BZT The right to retest this equipment to verify compliance with the regulation was given to the BZT Bescheinigung des Herstellers
206. s not affected by the STB query Note Changes to the status or enable registers are evaluated immediately Therefore an adequate change in cause or enabling criteria will change the status byte When the Status Byte Register is read an integer is returned This integer is the decimal equivalent of an 8 bit binary number For example 48 is the decimal equivalent of the binary 00110000 meaning that bit 4 MAV and bit 5 ESB are set to 1 Bit 4 contributes integer 16 and bit 5 contributes integer 32 If the status byte is read by serial poll bit 6 is returned as a request service RQS if it is read with an STB query bit 6 is returned as Master Summary Status MSS EXAMPLE EXPLANATION STB Reads the Status Byte Register Assume that 32 is returned Converting 32 to the binary 00100000 indicates that bit 5 ESB is set to 1 To determine the event status you would have to read the Event Status Register in the same manner using the ESR query Using the Computer Interface General Information RS 232 and IEEE 488 Service Request Enable Register The Service Request Enable Register SRE is an 8 bit register that enables or disables i e masks corresponding summary messages in the Status Byte Register STB The instrument can be programmed to make a service request on errors or when output is available Conditions that trigger a service request are specified by writing a binary weighted value to the Service
207. s on a single channel and view these measurements on the display Channel Scanning and Monitoring View measurements made for the monitor channel while scanning of all active channels continues Multi Function Display Left numeric display shows measurement readings also used when setting numeric parameters Right alphanumeric display used for numeric entries channel number selection and display status information and operator prompts Front Panel Operation Almost all operations can be readily controlled with the buttons on the front panel Measurement Input Function and Range Volts VDC volts ac VAC frequency Hz and resistance inputs can be specified in a fixed measurement range Autoranging which allows the instrument to use the measurement range providing the optimum resolution can also be selected Temperature Measurement Thermocouple types J K E T N R S and B and Hoskins Engineering Co type C are supported Also DIN IEC 751 Platinum RTDs are supported Totalize Events on the Totalizing Input Alarm Limits and Digital Output Alarm Indication 4 Terminal Resistance Measurements Channels 1 through 10 only RS 232 Computer Interface Operation Measurement Rate Selection Nonvolatile Memory Storage of minimum maximum and most recent measurements for all scanned channels Storage of Computer Interface setup channel configurations and calibration values Storage of measurement data storage for
208. scribed in this chapter For additional maintenance service and calibration procedures qualified service personnel can refer to the Hydra Series II Service Manual P N 688868 Cleaning A Warning To avoid electrical shock or damage to the instrument never get water inside the case to avoid damaging the instrument s housing never apply solvents to the instrument For cleaning wipe the instrument with a cloth that is lightly dampened with water or mild detergent Do not use aromatic hydrocarbons chlorinated solvents or methanol based fluids Line Fuse The instrument uses a T 125 mA 250V Slow blow line fuse in series with the power supply To replace this fuse located on the rear panel unplug the line cord and remove the fuse holder with the fuse as shown in Figure 6 1 The instrument is shipped with a replacement fuse that is loosely secured in the fuse holder Self Test Diagnostics and Error Codes When the instrument is powered up the entire display lights Note To hold the display fully lit press and hold then press ON and wait a moment for the instrument to beep Then release The entire display will now stay on until you press any button the power up sequence then resumes Self test diagnostics are performed each time the instrument is powered up Any errors encountered during this initial 4 second period are displayed momentarily Even in the presence of an error the instrument still attempts to complete the s
209. sed whenever a parameter for a channel or for the whole instrument needs to be set Selecting Channel Function and Range 8 4 Steps necessary for setting each type of measurement function are shown in the following tables DC Voltage Measurement Table 3 2 e AC Voltage Measurement Table 3 2 e Resistance Measurement Table 3 3 e Frequency Measurement Table 3 4 e Temperature Measurement Using Thermocouples Table 3 5 e Temperature Measurement Using RTDs Table 3 6 Additional channel configuration steps alarms scaling etc are discussed later in this chapter Operating the Instrument from the Front Panel Channel Configuration Table 3 1 Configuration Reset Settings Perform a Configuration Reset to restore these conditions by pressing and holding while cycling POWER ON Channels 0 20 OFF Measurement rate Slow Scaling M 1 all channels B 0 all channels Alarm parameters Limit 1 and Limit 2 OFF All limit values 0 Alarm assignments Channels 0 3 assigned to outputs 0 3 respectively Channels 4 20 assigned to digital I O lines 4 7 as follows appropriate channels OR ed to drive each line DIGITAL I O LINE 4 5 6 7 ASSIGNED TO 4 5 6 7 CHANNELS 8 9 10 11 12 13 14 15 16 17 18 19 20 Scan interval time 0 00 00 continuous Review values MIN MAX LAST cleared for all channels Digital I O lines set high non alarm Totalizer 0 with
210. sing the steps shown in Table 3 13 If necessary refer to Entering and Changing Numeric Values for a more detailed description of the number changing technique used here 3 13 Date Time Selection Year Month Day Hour Minut YEAR Mn dY e Hr nn PRESS CLOCK A THESE Garin W BUTTONS 4 4 4 gt D D TO SELECT 00 99 01 12 01 31 00 23 00 59 FROM THESE CHOICES Note The last press completes clock and calendar setting and returns the instrument to Inactive Mode Pressing during this sequence also returns the instrument to Inactive Mode all entries to this point are discarded and the clock calendar settings are left unchanged Measurement Connections A Warning To avoid electric shock e When the input module is installed consider all channels with connections as accessible terminals that may be hazardous live e Disconnect the input module before touching or changing external wiring e Remove inputs from live voltages before opening the input module 2620A 2625A Users Manual DC Volts AC Volts Frequency and Thermocouples Any analog input channel 0 through 20 can be used to measure dc volts ac volts or frequency For channel 0 use the two terminals on the front panel For channels 1 through 20 use the H high and L low inputs on the rear panel Input Module Note The terminals for channel 0 on the front panel do not support thermocouple mea
211. ster ESR Event Status Enable Register ESE and the output buffer These status registers are discussed in the following paragraphs Figure 4 4 shows the relationship of these registers 2620A 2625A Users Manual Read Using IER Event Enable Register Read Using IEE Write Using IEE 7161514132110 Enable Register Read Using SRE Write to Using SRE Read by Serial Poll Service Request Standard Event Status Register Read Using ESR Evert Status Enable Read Using ESE Write to Using ESE 5143210 RC aC Or Orr 7161514132110 7161514132110 y vvvvvvt Y0 291607 oo14f eps Figure 4 4 Overview of Status Data Registers Using the Computer Interface General Information RS 232 and IEEE 488 Table 4 4 Status Byte Register Bit Name Description 0 IEB Instrument Event Bit When any bit in the Instrument Event Register is set and the corresponding mask bit s in the Instrument Event Enable register is set this Instrument Event Bit in the Status Byte will be set When read the Instrument Event Bit is recomputed based on the new value from the Instrument Event Register and its mask the Instrument Event Enable Register 1 2 3 not used 4 MAV Message Available 5 ESB Event Status Bit 6 RQS MSS Request Service Master Summary Status 7 not used Event Status and Event S
212. surement For example using channel 7 to make 4 terminal resistance measurements requires the use of input terminals for both channels 7 and 17 Channel 17 cannot be used to take any other measurements as long as channel 7 remains configured for 4 terminal measurements Table 3 14 Thermocouple Ranges 3 20 Positive Lead Positive Lead Color Negative Lead Usable Range Type Material ANSI Material C J lron WHITE BLACK Constantan 210 to 760 K Chromel YELLPW GREEN Alumel 270 to 1372 E Chromel PURPLE VIOLET Constantan 270 to 1000 BLUE BROWN Constantan 270 to 400 N NISIL 270 to 1300 NOCROSIL R Platinum BLACK ORANGE Platinum 0 to 1767 13 Rhodium 5 Platinum BLACK ORANGE Platinum 0 to 1767 10 Rhodium B Platinum GRAY Platinum 0 to 1820 30 Rhodium 6 Rhodium Tungsten WHITE Tungsten 0 to 2316 26 Rhenium ANSI negative lead always RED IEC negative lead always WHITE Hoskins Engineering Co Use the following procedure for resistance or RTD measurement connections to the Input Module 1 Remove the Input Module from the rear panel 2 Loosen the two large screws on top and open the module 3 Connect wires to H high and L low terminals for each channel channel 7 for 2 terminal configuration or channels 7 and 17 for 4 terminal configuration in this example 4 Thread these wires through the strain relief pins and out the back of the module Refer to
213. surements Front panel channel 0 and Input Module channels 1 and 11 accept a maximum input of 300V or ac rms All other channels 2 through 10 and 12 through 20 accept a maximum of 150V or ac rms Use the following procedure for connections to the Input Module 1 2 3 4 Remove the Input Module from the rear panel Loosen the two large screws on top and open the module Connect wires to H high and L low terminals for each channel Thread these wires through the strain relief pins and out the back of the module Refer to Figure 3 2 Close the module cover secure the screws and put the module back in the instrument Operating the Instrument from the Front Panel Measurement Connections STRAIN RELIEF A ra r Alp r Alp r Alp r 0 r L3 Al r al 1 r gt 222 0 lt PON 7 NN N 2 lt V Figure 3 2 Input Module Connections 2620A 2625A Users Manual Resistance and RTD For all channels 0 through 20 2 terminal resistance or RTD measurements are allowed Four terminal measurements can be made on channels 1 through 10 only Refer to Figure 3 3 For each channel configured for 4 terminal measurements channels 1 10 only a second channel numbered 10 higher than the first becomes unavailable for any other type of mea
214. t Using the eter cie cemere ipt Setting up a Channel cie peer eere etie ee Setting Alarm Limits and Mx B Scaling Values Alarm Eri E AR setting the Scan IBnterval u sa eerie Using the Monitor Function essere eene nennen nennen Using the Scan E n etl n noL UE Reviewing Channel Data essere ener Viewing the Totalizer Count essere nennen nennen Using External DC 1 Using the Rack Mount Kit eese nennen rennen 2 1 2620A 2625A Users Manual 2 2 Overview Introduction Introduction Chapter 2 provides an overview of the major features of the instrument Comprehensive details on all instrument features are found in Chapter 3 for front panel operation and Chapter 4 for computer interface operation Setting Up the Instrument Unpacking and Inspecting the Instrument The following items are included in the shipping container e This manual Hydra Series II Starter Software e Hydra Series II Data Acquisition Unit 2620A or Hydra Series Data Logger 2625A e Input Module e Digital I O and Alarms Connector e Test leads e Line cord Carefully remove the instrument from its shipping container and insp
215. t channel while the Monitor alarm trigger is in use measurements on the new monitor channel are used to trigger scans when the monitor measurement is in alarm When monitor and scanning are both enabled at least one monitor channel measurement is taken after every set of scan measurements even in the case of continuous scanning Thermal Voltages Thermal voltages are the thermovoltaic potentials that appear at the junction between dissimilar metals Thermal voltages which can easily exceed 1 uV typically arise where wires are attached to binding posts With low level dc voltage and thermocouple temperature measurements these thermal voltages can be an additional source of measurement error Thermal voltages can also cause problems in the low ohms ranges Some low value resistors are constructed with dissimilar metals Just handling such resistors can cause thermal voltages large enough to introduce measurement errors On Hydra Series II the rear panel Input Module channels 1 through 20 contains an isothermal block to minimize thermal voltage errors The front connector pair channel 0 which does not attach directly to this block is more susceptible to thermal voltage errors Use the following techniques to reduce the effect of thermal voltages 1 Use similar metals for connections wherever possible e g copper to copper gold to gold etc Use tight connections Use clean connections especially free of grease and dirt
216. t from the Front Panel Setting ATArms u u u Alarm Limits 2e Ei eere a a Alarm Indications Resetting Alarm Conditions Using the Digital I O Lines eene nennen MX B Sealing cnnic a a E Instrument Configuration Entering and Changing Numeric Values Selecting Scan Selecting the Measurement 00 PAS ROTI ss External TrIg8erIng uua cit eee d eere eh RE ede Re ed Te RR CERTA Changing the Temperature Unit essen Setting Date and Time of Measurement Connections eese enne rennen nennen nennen DC Volts AC Volts Frequency and Thermocouples Resistance and DO CAM ZAM g AE H en pc det COMMECHIONS foi ss REVIEW irii chats List Button Functions nier ete reU haee a PATO PINE u a a tisse te cioe Stora ge Front Panel Lock out Conditions essere 3 1 2620A 2625A Users Manu
217. tatus Enable Registers The Event Status Register ESR records specified events in specific bits See Figure 4 4 and Table 4 5 When a bit in the ESR is set 1 1 the event that corresponds to that bit has occurred since the register was last read or cleared For example if bit 3 DDE is set to 1 a device dependent error has occurred The Event Status Enable Register ESE is a mask register that allows the host to enable or disable mask each bit in the ESR When a bit in the ESE is 1 the corresponding bit in the ESR is enabled When any enabled bit in the ESR changes from 0 to 1 the ESB bit in the Status Byte Register also goes to 1 When the ESR is read using the ESR query or cleared using the CLS command the ESB bit in the Status Byte Register returns to 0 Status Byte Register The Status Byte Register STB is a binary encoded register that contains eight bits Note that the Service Request Enable Register SRE uses bits 1 through 5 and bit 7 to set bit 6 the request service RQS bit as enabled by the SRE When the RQS bit is set true 1 the instrument sets the SRQ line true 1 which generates a service request The eight bits of the Status Byte Register as read by the STB query are described in Table 4 4 4 19 2620A 2625A Users Manual Table 4 5 Event Status Register Bit Name Description OPC Operation Complete Set true 1 upon execution of the OPC command indicating that the instr
218. tes 17 20 Second measurement result if any bytes 21 24 Third measurement result if any Since the ASCII decoding explained above creates data multiples of three in length it is possible that there will be one or two unused bytes at the end of the decoded byte stream Floating Point Conversion ANSI TEEE Std 754 1985 IEEE Standard for Binary Floating Point Arithmetic describes the single precision floating point format used to return measurement data This standard defines the format for single precision floating point as X2 CDn 2 xLm where sign exponent m mantissa E 3 2620A 2625A Users Manual The floating point format used is 32 bit with a 1 bit sign 8 bit exponent and 24 bit mantissa with the most significant bit hidden under the LSB of the exponent The number is formatted as shown in Table F 1 Table E 1 Floating Point Format sign 1 bit exponent 8 bits mantissa 23 bits plus one hidden bit high byte MMSB hi mid byte MLSB low mid byte LMSB low byte LLSB For all other measurement queries Hydra Series II returns the string 9E 9 for open thermocouple OTC measurement values However for the LOG_BIN query NaN not a number is returned instead The IEEE floating point standard defines NaN as a positive maximum exponent number with non zero mantissa bits Hydra Series II sets just the most significant mantissa bit so the raw binary byte stream value is 7f cO 00 00 hex
219. through the RS 232 computer interface or listed on a printer Here are some rules to follow when using Autoprint and Memory Storage 1 The RS 232 interface must be enabled before Autoprint can be enabled RS 232 is always enabled on the Hydra Series II Data Logger 2 Since the instrument does not print over the IEEE 488 interface Autoprint is automatically turned off when you enable the 488 interface Hydra Series II Data Acquisition Unit only 3 If you have selected Memory Storage Hydra Series II Data Logger only verify that the RS 232 interface is configured correctly before you upload the memory contents to a PC or printer Autoprint Computer Interface Control Autoprint can be controlled from the front panel or over the RS 232 interface Refer to Chapter 3 for front panel operation Through the RS 232 interface the PRINT TYPE command can be used to set up Autoprint and the PRINT command can be used to enable Autoprint These commands follow a structure paralleling the front panel procedure PRINT TYPE selects destination 0 for Print Scans 1 for Store Scans or 2 for both and type 0 for ALL 1 for ALAr or 2 for trAnS PRINT sets printing on 1 or off 0 Autoprint Output Format The first line of an autoprint printout contains time and date values that identify when the scan was started Time values include Hour Minute Seconds and date values include Month Year Day As an example the following line is a
220. tion Access the Review Array press REVIEW annunciator comes Press and simultaneously to activate the Review Only function REM annunciator comes dim gt lt and Y can now be used to view the various elements of the Review Array All other front panel buttons are locked out yielding a long beep when pressed Press both and again to deactivate the Review Only function and return the instrument to normal front panel button operation regular Review Array display Front Panel Monitor Only Function First place the instrument the Monitor Function press MON annunciator comes on Then press and simultaneously to activate the Monitor Only Function REM annunciator comes on 3 26 Operating the Instrument from the Front Panel REM Annunciator and can now be used to change the monitored channel All other front panel buttons are locked out a long beep results from their use Press both and again to deactivate the Monitor Only function and return the instrument to normal front panel button operation regular Monitor Function on Computer Interface Initiated Lockouts Front Panel lockout can also be specified over the Computer Interface with the following commands e REMS RS 232 only four front panel buttons remain active sur and rower e RWLS RS 232 only only the button remains active e LOCK 1 gt A and Y can now be used to view
221. tion Read and write bus handshaking including hold off Basic talker with serial poll and without talk only mode Serial poll is used to return the instrument status byte to the controller No extended talker Basic listener without listen only mode Listen only mode is only useful for an IEEE 488 device like a printer No extended listener Service request interface allows SRQs service requests The SRQ function allows the instrument to notify the controller when an operation is complete Remote local capability with local lock out Usually the instrument front panel will not be operational while the instrument is in use by the IEEE 488 interface Remote local capability enables the front panel Local lock out disables the front panel No parallel poll capability Parallel poll is rarely used in the industry It was intended as a fast way to get a status bit from several devices but failed in gaining acceptance Device clear capability This allows the instrument to be initialized to a known state The IEEE 488 2 standard describes exactly what this known state is Not a controller Open Collector Outputs Enabling the IEEE 488 Interface The IEEE 488 interface can be enabled only from the front panel using the following procedure This procedure is also summarized in Table 4 3 Table 4 3 IEEE 488 Setup Press these buttons To select from these choices Baud Address COMM A A usr
222. u attempt to select STORE SCANS or BOTH The Hydra Data Logger can hold 2047 scans with each scan containing 21 channels of data Refer to List Button Functions in Section 3 for an example of some printed scans 4 39 2620A 2625A Users Manual 4 40 Table 4 8 Command and Query Reference cont PRINT_TYPE Data Logging Type Query RS 232 only Return the Autoprint or internal Memory Storage type and the type of scan data logged Returns 0 AUTOPRINT 1 STORE OR 2 BOTH and 0 ALL 1 ALARM or 2 TRANS For example 1 0 could be returned signifying that all scan data is sent to internal Memory Storage An Execution Error is generated if this query is used with the IEEE 488 interface RANGE Channel Range Query Returns the range used for the most recent scan involving this channel The most recent scan is the scan in progress or if scanning is not in progress the last completed scan This is the range presently in use for channels set up to autorange Note that measurements on the monitor channel do not affect the response to this command RANGE channel channel 0 20 If the channel specification field is left blank values for all defined channels are returned Channels defined as OFF are not included An Execution Error results if a request is made for a channel defined as OFF the channel specified is invalid or if the channel has been set up but not measured The range
223. ultimeter again verify that alarm outputs 0 through 3 are in the OFF or HIGH state Set the 5700A to output 1 1000 volts Verify that the alarm outputs 0 through 3 are in the ON or LOW state measure less than 0 8V dc 6 19 2620A 2625A Users Manual ALARM OUTPUTS DIGITAL ALARM OUTPUT CONNECTOR 1 2 3 GND 11 12 13 14 15 16 17 18 19 20 SOURCE HL 4 WIRE INPUT MODULE SENSE HL HL HL HL HL HL 4 WIRE 2 3 4 5 6 7 8 9 10 5700A HYDRA OUTPUT SENSE FRONT PANEL VQA FLUKE REVIEW LAST FUNC ALRM Mx B CURRENT USE STACKED BANANA JACKS 0021f eps Figure 6 4 Dedicated Alarms Output Test 6 20 Maintenance Calibration 6 External Trigger Input Test The External Trigger Input Test verifies that the rear panel trigger input of Hydra Series is functioning properly 1 Switch OFF power to the instrument and disconnect all high voltage inputs 2 Remove the Alarm Output eight terminal connector module from the rear of Hydra Series II and all external connections to it Connect short wires to be used as test leads to the ground and TR terminals Leave other ends of wires unconnected at this time Reinstall the connector Refer to Figure 6 5 ALARM OUTPUTS DIGITAL I O 00 0
224. ument has completed all selected pending operations not used Always set to 0 QYE Query Error Generated true 1 by the INTERRUPTED or UNTERMINATED message exchange state transitions See IEEE 488 2 Sets the QYE bit of the Event Status Register Under RS 232 this causes the gt prompt to be returned DDE Device Dependent Error Generated true 1 by overflows of the RS 232 input buffer or by calibration errors Sets the DDE bit of the Event Status Register Under RS 232 this causes the gt prompt to be returned EXE Execution Error Generated true 1 by parameters out of bounds or by a valid command that could not be processed due to an internal condition such as calibration commands being received when calibration is not enabled Sets the EXE bit of the Event Status Register Under RS 232 this causes the gt prompt to be returned CME Generated true 1 by syntax errors including unrecognized command incorrect command sequences and GET messages inside a program message Sets the CME bit of the Event Status Register Under RS 232 this causes the gt prompt to be returned not used Always set to 0 PON Always set to 0 Power On Set true 1 after an off to on transition has occurred in the instrument s power supply Reading the Status Byte Register 4 20 The host can read the Status Byte Register by taking a serial poll or by sending the instrument a STB query The value of the status byte i
225. urement rate 5 3 Memory full operation 4 7 Memory retrieval Memory storage computer interface control 4 6 Mx B scaling 3 12 Operating modes 3 3 Other displayed data P Performance tests 6 4 R Rate A 12 REM annunciator 3 27 Resetting alarm conditions 3 11 Resistance 3 7 Resistance and RTD 3 20 Review 3 22 RS 232 information RS 232 prompts RTD temperature accuracy 1 6 14 RTD temperature accuracy test using decade resistance sm d RTD temperature accuracy test using DIN IEC 751 Sample program using the RS 232 computer interface Selecting scan interval 3 15 Selecting the measurement rate Self test diagnostics and error 6 3 Sending numeric values to the instrument RS 232 and IEEE 488 4 16 Service 6 22 Setting alarms 3 9 Setting communication parameters RS232 4 4 Setting date and time of day 3 17 T Thermocouple measurement range accuracy test Thermocouple temperature accuracy test Threshold Totalizer sensitivity test 6 18 Totalizer test Totalizing Totalizing input Triggering Types of computer interface Typical input strings 4 14 U Using the digital I O lines 3 11 Using the IEEE 488 Interface 4 9 Using the RS 232 computer interface 4 3 V Variations in the display 6 22 W What is the present confi
226. valid start of scan time 4 5 2620A 2625A Users Manual 10 33 45 5 11 90 Lines following the time and date contain measurement data for channels that have been set up for this session The last line of the printout contains the Totalizer count and the status of the digital I O lines Channel data is formatted to fit three readings onto an 80 column line Each reading provides the following information e Channel number followed by a colon and a space 4 characters e space or minus sign 1 character e Digits and decimal point Measurements taken at the fast rate use 5 characters 4 digits plus a decimal point Measurements taken at the slow rate use 6 characters 5 digits plus a decimal point e Space l character e Measurement multiplier m for X0 001 space for for X1 000 for X1 000 000 e Measurement units VDC VAC OHMS HZ C F Mx B 4 characters left justified e Space l character e Alarm indication for Limit 1 H High L Low R Return 1 character a blank space no alarm limit is used or alarm inactive e Slash used as a separator when either alarm indicator is shown 1 character e Alarm indication for Limit 2 H L space no alarm limit is used or alarm inactive e Two spaces between channel measurements 2 characters e The following example illustrates this format 07 42 0102 09 91 5 3 2345 mMX B H R12 123 87 kOHMS L17 31 268VAC ALM 15DIO 204TOTAL 0 Memo
227. value returned is the measurement range and is not affected by Mx B scaling Temperature functions thermocouple and RTD have only one range which is considered fixed 1 For each defined channel an integer value 1 6 is returned Commas separate integers for different channels and no blank spaces are included For example if channel 1 last used the 30V range during a scan measurement channel 11 used the 3 MO range channel 12 used the 900 Hz range and channel 13 measured a thermocouple the response is 3 5 1 1 Refer to the FUNC description for range definitions RATE Select Measurement Rate Specify the measurement rate Successful execution of this command clears all values in the Review array RATE rate rate 0 slow 1 fast An Execution Error is generated if the argument is not 0 or 1 or if measurements are active RATE Measurement Rate Query Return measurement rate for the instrument Returns 0 SLOW or 1 FAST Using the Computer Interface Computer Interface Command Set Table 4 8 Command and Query Reference cont REMS Remote without Lockout RS 232 only Enter the IEEE 488 1 remote without front panel lockout REMS state The REM annunciator is lit and only the following three front panel buttons are now active with special REMS functionality triggers a single scan A generates a service request returns the instrument to normal front pan
228. values for each channel These values are stored in the Review Array You can examine the data in the Review array when the instrument is in Active Mode or Inactive Mode If you are in Active Mode i e the Scan and or Monitor functions are on the instrument will continue to take measurements in the background while you examine the Review data Press to call up the Review array onto the display Use the four arrow buttons to examine different entries in the Review array The arrow buttons move around in the Review array as illustrated below xiv Getting Started continued 9 lt _ gt D 20 LAST MIN MAX LAST MIN MAX oo24f eps Press or to remove the Review data from the display when youre through The remainder of this manual covers all aspects of using Hydra Glance over the Table of Contents you ll find that each section presents an additional layer of information You can use as little as or as much as you need for your Hydra application XV 2620A 2625A Users Manual xvi Chapter 1 Introduction Title The Hydra Series II Data Acquisition Unit The Hydra Series II Data Logger Options and Applications Sofware TEEE 488 Interface Assembly n nee Connector Set 2620 100 PX CCOSSOTIOS
229. y Returns alarm output associations for the indicated channel and alarm limit ALARM ASSOC channel limit num channel 4 20 lt limit_num gt 1 2 Returns the digital output line number associated with the indicated alarm limit An Execution Error is generated if no output is associated with this alarm limit if invalid channel numbers are used or if limits other than 1 or 2 are used Clear Alarm Association Clear the digital output association for the indicated channel and alarm limit ALARM ASSOC CLR channel limit num channel 4 20 limit num 1 2 When the association is cleared the output pin is left in a high non alarm state If the alarm limit specified is not 1 or 2 or if the channel is invalid an Execution Error is generated ALARM DO LEVEL Set Alarm Output Level Set or clear the indicated alarm digital output ALARM DO LEVEL DO line DO state DO line 0 3 DO state 1 high 0 low Alarm outputs 0 3 correspond to channels 0 3 respectively If the digital output line requested is not in the range 0 through 3 an Execution Error is generated If the DO state specified is not 1 high or 0 low an Execution Error is generated ALARM DO LEVELS Alarm Output State Query Returns digital output levels for the four alarm digital outputs Returns an integer value representing the state of each of the digital I O lines The low order four

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