Model 7706 Multiplexer Card User`s Guide PA-719
Contents
1. OE UTE eS A __ I cn 5 p E O gt O 00000000000 D 8000 zu 5 Es m 1 Le EN ien 14 6n OOO val 931 ooo La 4 55 n po EB ano ooo O ooo po s S 210000 000 ooo tj a Y oc 23 po So ste 0000 e o m oe d E zB R ooo 20 oe ex gg a Em Es o El ooo oec ooo 5 mE 2o oc d ES E R gen ooo O lt ooo oO 3 s gt o o ooo n S 7 we ooo P Oc oj 5 zs C ko 914 PEN2. B Ej 5 ooo 9 ooo o i Le ooo ooo o e zd e 9 d 2 ooo Seer a 6 ooo o d 255 B i5 ou ac D 2 E ooo pees E s 9 ooo 5 B o o 5 9 15 o m lng 25 ooo o o ooo 000 o 9 Z 9598 2 L soo ooo o ooo SIE ere 222 8 Imi _ J E eoo 5 o EZ o o Gate O Gate Threshold jumper J2 JIN closed 1 2 TTL VUE O JN 7 ET y ITI wo c Verification 33 Model 7706 module Calibration The following procedures calibrate the temperature sensors on the Model 7706 plug in module as well as the analog outputs Recommended test equipment In order to calibrate the Model 7706 you will need equipment summarized in Table 7 Extender board connections The Model 7706 being calibrated should be connected to the 7798 250B Calibration Extender Board and the extender board must be installed in
3. od g d E G8 C RAO R38 R31 R96 o 9 000 1 CR30 C J creo Reale 020530 E Sw O eb o H OOO o o d RENS ded aih oo 948 SR94 Rize b E 8 8 edis m O edo ooo DOLES R54 O D d R53 OOO O oss O Da died 000 Fee a Rot O D8 8 n pap eod p 052 5 005 ooo R56 o 050 CR21 AE an 039 040 041 042 DOE CR40 789 R97 ooo 9 Bd Ere 000 Oy uem Bp nt02 ooo 675 ed ooo 0 EAE ons O R57 m m m H ooo o ooo H ooo ooo Lo o CLP HE o o o du E A ro Tt is ES e get ae D 9 20 d mim A R55 o o C42 39 TP2 J Ol ER EE Heg Ras 000 m Li PT 4 74 H H H m ce cf m 5 itr Dass E EM TE ml Tu R28 5 Res 2 8 B 829 m M uam u 55 H m L
4. Channel 21 SISISISISISSISSS l Multiply the binary values 1 0 0 O 1 Binary Value by the decimal weight 128 64 32 16 8 Decimal weight Add the products together 128 040 0 8 0 2 0 138 this is the value in the command Therefore the command to send is OUTP DIG BYTE 138 121 Channel 21 of the Model 7706 slot 1 NR value of 138 specifies which terminals are 1 O 8 bit Digital Output 10 Connection Figure 11 Sample digital output for Channel 22 JI S tls 80 Ls Digital output E kaa Low S CH22 10 9 8 7 4 3 2 1 Screw terminal number B7 B6 B4 B3 B2 B1 BO Bit Position O 1 0 1 O l Binary Value 27 26 25 24 23 22 21 20 weights 128 64 32 16 8 1 Equivalent decimal weight Example Channel 22 SISISI SIS S SIS Ss m Multiply the binary values 1 0 0 0 1 Binary Value by the decimal weight 128 64 32 16 8 Decimal weight Add the products together 128 0 0 0 8 0 0 1 137 this is the value in the command Therefore the command to send is OUTP DIG BYTE 137 122 Channel 22 of the Model 7706 in slot 1 N
5. temperature Ratio and Channel average the channels are paired as follows CHI and 11 CH2 and CH12 CH3 and CH13 CH4 and CH14 CH5 and CH15 configuration connections CH6 and CH16 CH7 and CH17 and CH18 CH9 and CH19 CH10 and CH20 WARNING The information in this section is intended for qualified service personnel Do not attempt to perform this procedure unless qualified to do so Figure 2 shows how to access the screw terminals on the Model 7706 Channel designations for the screw terminals are con tained in Figure 3 Figure 2 Screw terminal access LOCK WARNING Do not exceed the maximum specifications for the Model 7706 module Refer to the end of this packing list for specifications Connection Figure 3 Model 7706 screw terminal channel designations Digital output Analog input 21 mE Bit 0 L Bit 1 2 Bit 2 L Bit 3 CH3 ils L GND H Bit 4 Analog input GEM L Bit 5 H H Bit 6 Digital output SES 22 H SN Bit 0 CH12 L Bit 1 H Bit 2 CH13 L Bit 3 L GND CH15 Bit 4 Bit 5 H Bit6 Analog CH16 L Bit 7 Outputs CH17 H CH23 H GND CH18 CH24 H GND _ CH19 G 7 G CH20 IN L CH6 IN _ H CH7 L To
6. As mentioned in Table 3 Channels 21 and 22 are eight bit digital output channels and Channels 23 and 24 are analog output channels with a range of 12V to 12V For individual digital channels the range of values allowed is 0 255 and the outputs are set to the closest integer to the sent value Analog outputs will accept values of 12 to 12 Attempting to use this command with an input channel generates error 221 settings conflict VOLTage lt nrf gt lt clist gt Force voltage VOLTage lt clist gt Query voltage Use to force or query the analog output of the given channel s to the desired value Values are rounded to the nearest mV 12VDC lt x lt 2 28 Bus commands DiGital BYTE lt nrf gt lt clist gt Use to force the digital output of the given channel s to the desired value 0 lt x lt 255 in decimal format Use this command to write to Channel 21 or 22 individually Bit 0 of each port is the LSB BYTE lt clist gt Query the present bit pattern 0 lt x lt 255 for the digital output channels returned in decimal format Use this command to query Channel 21 or 22 individually WORD nrf clist Must write to the lower port channel 21 Channel 21 bit 0 will be the LSB and Channel 22 bit 7 will be the MSB WORD lt clist gt Query the present bit pattern 0 lt x lt 65535 for the digital output channels returned in decimal format This command must be sent to C
7. Save cal constants to card EEPROM Lock out calibration Request cal lock state 0 locked 1 unlocked Temperature sensor cold calibration lt NRf gt temperature Path to analog output calibration Analog output DAC calibration Path to card in slot 2 Request number of times card has been calibrated Request card calibration date Diagnostic root Keithley path Calibration path Unlock command 37 Model 7706 module CODE CALibration PROTected CODE NOTES The CODE command should be sent only once before performing calibration Do not send CODE before each calibration step The code parameter must be enclosed in single quotes Purpose To program the calibration code or password so that you can perform the Model 7706 calibration procedures Format CAL PROT CODE CHAR STRING gt Parameter Up to a 8 character string including letters and numbers Description The CODE command enables the Model 2700 calibration procedures when performing these procedures over the bus This command must be sent to the unit before sending any other Model 7706 calibration command The default calibration code is KI002700 Example CAL PROT CODE KI002700 Send default code of KI002700 COUNE CALibration PROTected CARD1 COUNt CALibration PROTected CARD2 COUNt Purpose To determine how many times a Model 7706 has been calibrated Format CAL PROT CARD1 COUN CAL PROT CARD2 C
8. They must be protected from electric shock and contact with hazardous live circuits Maintenance personnel perform routine procedures on the product to keep it operating properly for example setting the line voltage or replacing consumable materials Maintenance procedures are described in the user documentation The procedures explicitly state if the operator may perform them Otherwise they should be performed only by service personnel Service personnel are trained to work on live circuits perform safe installations and repair products Only properly trained service personnel may perform installation and service procedures Keithley Instruments products are designed for use with electrical signals that are rated Measurement Category and Measurement Category as described in the International Electrotechnical Commission IEC Standard IEC 60664 Most measurement control and data I O signals are Measurement Category and must not be directly connected to mains voltage or to voltage sources with high transient over voltages Measurement Category connections require protection for high transient over voltages often associated with local AC mains connections Assume all measurement control and data I O connections are for connection to Category sources unless otherwise marked or described in the user documentation Exercise extreme caution when a shock hazard is present Lethal voltage may be present on cable connector jacks or test
9. COMPARATOR LM311M IC 776 U12 IC 8 CHAN ANA MULTIPLEXER DG408DY IC 844 U13 U23 IC DUAL OPTO IC 1358 U14 U15 U16 U17 IC CENTIGRADE TEMP SENSOR LM35DM IC 906 U18 IC UNREGULATED DC DC CONVERTER IC 1355 U19 U20 IC 16 BIT MONOLITHIC PCM AUDIO DAC IC 1136 U2 IC QUAD 2 INPUT NAND 74HC00M IC 781 U21 U22 IC OPA177GS IC 960 U24 U34 IC TINYLOGIC CMOS INVERTER IC 1282 46 Table 10 Continued Replaceable parts Model 7706 parts list Circuit Designation Description Keithley Part No U24 U34 U11 U26 U29 U7 U8 U9 IC OCTAL D FLIP FLOP IC 1353 U25 IC 5V VOLTAGE REGULATOR IC 1171 U3 IC 8 STAGE SHIFT STORE MC14094BD IC 772 U30 U31 IC OCTAL BUFFER IC 1252 U32 IC 2 5 CASCADABLE SERIAL EEPROM LSI 212 U33 IC 8 BIT MICROCONTROLLER LSI 242 U4 U5 IC SCHMITT TRIGGER NAND GATE IC 950 U6 U10 IC 3 TO 8 LINE DECODE 74ACT138 IC 654 VRLVR2 DIODE ZENER 12V MMSZI2TI DZ 112 YI CRYSTAL CERAMIC RESONATOR 8M CR 59 2 MECHANICAL PARTS TOP COVER HEAT STAKE ASSEMBLY 7700 302 BOTTOM CARD COVER 7702 301 COMPRESSION SPRING SP 7 3 47 Model 7706 module Figure 26 Component layout Side 04
10. Memaeeao Channel 25 TOTALIZE INPUT Channel 25 MAXIMUM COUNT 232 1 TOTALIZE INPUT 100kHz max rising or falling edge programmable SIGNAL LEVEL 1Vp p min 42Vpk max THRESHOLD 0V or TTL jumper selectable DATE INPUT TTL Hi TTL Lo or none COUNT RESET manual or Read Reset READ SPEED 50 s ENVIRONMENTAL Specified for Model 2700 firmware revision A02 or later OPERATING ENVIRONMENT Specified for 0 C to 50 C Specified to 80 R H at 35 C STORAGE ENVIRONMENT 25 C to 65 WEIGHT 0 5kg 1 1 Ibs 08 01 07 Rev Specifications are subject to change without notice All Keithley trademarks and trade names are the property of Keithley Instruments Inc All other trademarks and trade names are the property of their respective companies KEITHLEY R EA T MEASURE N F TD E N Keithley Instruments Inc Corporate Headquarters 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY www keithley com 12 06
11. analog output 2 must be connected to CH2 Example CAL PROT CARD1 DAC STEPO Perform 7706 DAC calibration 41 Model 7706 module CALibration PROTected CARD1 STEPO Purpose To perform Model 7706 temperature calibration Format CAL PROT 1 STEPO lt TEMP gt Parameter temp Cold calibration temperature C Description STEPO performs temperature sensor calibration of the Model 7706 The card must be allowed to cool down to ambient temperature before calibration and the cold temperature of the card must be measured and sent as the temp parameter during calibration NOTE Before calibrating the temperature on the Model 7706 make sure that power has been removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibration procedure complete the procedure as quickly as possible to minimize card heating that could affect calibra tion accuracy Example CAL PROT CARD1 STEPO 23 Perform 7706 calibration Remote error reporting Methods to detect and determine the nature of calibration errors are discussed below Error summary Table 9 summarizes Model 2700 calibration errors 42 Table 9 Calibration error summary Remote error reporting Error number and description Error number and description 400 10 vdc zero error 401 100 vdc zero error 402 10 vdc full scale error 403 10 vdc full scale error
12. 2 use the same connection setup as in Figure 24 Connect CH23 H and L terminals to CH1 and L terminals H to H L to L Connect 24 H and L terminals to CH2 H and L terminals H to H L to L With the power off install the Model 7706 in Slot 1 and select the rear inputs with the INPUTS switch Press in and hold the Model 2700 OPEN key while turning on the power Allow unit to warm up for two hours before proceeding Press the SHIFT key and then the TEST key Select TEST CALIB using the up or down range keys Press the ENTER key select RUN and enter the appropriate calibration code default 002700 Using the up or down range key select CARD at the CAL RUN prompt then press ENTER Using the up or down range key select DAC at the next CARD prompt then press ENTER to complete Model 7706 DAC calibration 35 Model 7706 module Remote Model 7706 analog output DAC calibration 1 Connect the Model 7706 CH23 and 24 to CH1 and 2 use the same connection setup as in Figure 24 Connect 23 H and L terminals to CH1 H and L terminals H to H L to L Connect 24 H and L terminals to CH2 H and L terminals H to H L to L With the power off install the Model 7706 in Slot 1 and select the rear inputs with the INPUTS switch Turn on the Model 2700 power Allow unit to warm up for two hours before proceeding Unlock calibration by sending DIAG KEIT CAL UNLOCK 6 Enable calibration
13. 2 of the 2700 User s Manual they can be manually configured Connection Figure 1 Simplified schematic for Model 7706 NOTES Channels 26 28 in this schematic refer to the designations used for control and not actual available channels Q O Channels 26 27 and 28 can be individually controlled using ROUTe MULTiple if the module is not to be connected to the internal DMM junction ef x2 For more information refer to the ROUTe MULTiple command section in the Model 2700 User s Manual Input Channel 10 LO EE P 05 Channel 26 UNE Channel 27 To Model 2700 ap ai TE E susica see Note see Note Backplane Channel 1 J LO i Channel 28 see Note Channels 2 9 Backplane isolation o oo H of un 2 un O Backplane f x2 isolation HI of Channel 11 Sense LO au Channel 23 DAC Channel 23 Bit 1 Channel 24 Channel 21 DAC Channel 24 E NOTE Non isolated DE grounds J 1 referenced to 3 LChannel 22 chassis ground z O HIN E Channel 25 O GATE NOTES Connect 4 wire sense leads using channels 11 20 disconnect channels 11 20 from channels 1 10 send ROUT MULT CLOS 0126 note opposite logic Model 7706 module When automatically configured for 4 wire measurements including 4 wire
14. and is Channel 22 Pins 5 and 6 on each digital port are ground To find the decimal equivalent of the binary pattern first determine the pattern mapped to the screw terminals on the desired digital output refer to the example contained in Figure 10 Setting a bit to a logic 1 effectively sets the screw terminal to 5 V while setting it to a logic 0 sets the screw terminal to OV Then for each screw terminal or bit position multiply the binary value either a 1 or a 0 by the decimal weight see Figure 10 The sum of the products is the decimal equivalent value of the binary pattern This decimal value can be either sent over the bus as in the example or by using the front panel of the Model 2700 To send it over the front panel under the SHIFT gt CARD menu key in the decimal value 138 for the menu item DIGOUTI Refer to Figure 11 for a sample on Channel 22 Model 7706 module Figure 10 Sample digital output for Channel 21 SISISISISSISSISIS Digital output CH21 10 9 8 7 4 3 2 1 Screw terminal number B7 B6 B5 B4 B3 B2 B1 BO Bit Position 0 1 0 1 0 1 0 1 O 1 Binary Value 27 26 29 24 23 22 21 20 weights 128 64 32 16 8 4 2 1 Equivalent decimal weight Example
15. by sending the CODE command For example the default command is CAL PROT CODE 1002700 7 Initiate calibration by sending the following command CAL PROT CARD1 INIT 8 Calibrate the Model 7706 analog output with the following command CAL PROT CARD1 DAC STEPO 9 Send the following commands to save calibration and lock out calibration CAL PROT CARD1 SAVE CAL PROT CARD1 LOCK Calibration commands Table 8 summarizes calibration commands for the Model 7706 plug in module Note that CARD1 commands calibrate the card in Slot 1 while CARD2 commands request calibration count and date information from a card in Slot 2 NOTE The 7706 must be installed in Slot 1 through a Model 7798 extender card to perform temperature calibration 36 Calibration comma nds Table 8 Model 7706 calibration commands Command Description CALibration Calibration root command PROTected All commands in this subsystem are protected by the calibration lock except CODE up to 8 char string CARDI COUN RCOunt DATE SAVE LOCK LOCK STEPO lt NRf gt DAC STEPO CARD2 COUN DATE DIAGnostic KEIThley CALibration UNLOCK queries and CODE Send calibration code Default KI002700 Path to card in slot 1 Initiate card calibration Request number of times card had been calibrated Reset card calibration count to 0 Request card calibration date
16. drain pull up WRITE SPEED 50 s ANALOG VOLTAGE OUTPUT Channels 23 and 24 DAC 1 2 12V 1mA max non isolated DAC 1 2 10V 5mA max RESOLUTION 1mV SETTLING TIME 1ms to 0 0196 of output ACCURACY of output mV Measured with 10M input resistance DMM Accuracy includes DC plus RMS response lyear 5 C 0 15 19mV 90 day 5 C 0 1 19mV 24 hour 1 0 04 19mV TEMPERATURE COEFFICIENT 0 015 1mV C WRITE SPEED 50 s 1 Minimum signal level 10mV 10uA Channels 26 28 in this schematic refer to the designations used for HI control and not actual available channels Input P LO Channels 26 27 and 28 can be individually controlled using ROUTe MULTiple if the module is not to be connected to the Sense internal DMM LO For more information refer to the Cold junction ROUTe MULTiple command section Ref x2 H in the Model 2700 User s Manual Channel 1 19 Channel 28 see Note Backplane isolation HI i o HI Channels 2 9 Channel 10 Input o 0 LO Channel 26 2 Pole Open 4 Pole Closed see Note To Model 2700 Backplane Channel 27 see Note Backplane isolation j old junction Ref x2 H Channel 11 LO Channels 12 19 HI Channel 20 o o7 Channel 23 21 fom 22 Channel 24 DAC Channel 24 Non isolated grounds J are referenced to chassis ground
17. fixtures The American National Standards Institute ANSI states that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Operators of this product must be protected from electric shock at all times The responsible body must ensure that operators are prevented access and or insulated from every connection point In some cases connections must be exposed to potential human contact Product operators in these circumstances must be trained to protect themselves from the risk of electric shock If the circuit is capable of operating at or above 1000V no conductive part of the circuit may be exposed Do not connect switching cards directly to unlimited power circuits They are intended to be used with impedance limited sources NEVER connect switching cards directly to AC mains When connecting sources to switching cards install protective devices to limit fault current and voltage to the card Before operating an instrument ensure that the line cord is connected to a properly grounded power receptacle Inspect the connecting cables test leads and jumpers for possible wear cracks or breaks before each use 04 09 When installing equipment where access to the main power cord is restricted such as rack mounting a separate main input power disconnect device must be provided in close proximity t
18. is present connect it to safety earth ground using the wire recommended in the user documentation The A symbol on an instrument means caution risk of danger The user should refer to the operating instructions located in the user documentation in all cases where the symbol is marked on the instrument The A symbol on an instrument means caution risk of danger Use standard safety precautions to avoid personal contact with these voltages The N symbol on an instrument shows that the surface may be hot Avoid personal contact to prevent burns The symbol indicates a connection terminal to the equipment frame If this symbol is on a product it indicates that mercury is present in the display lamp Please note that the lamp must be properly disposed of according to federal state and local laws The WARNING heading in the user documentation explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading in the user documentation explains hazards that could damage the instrument Such damage may invalidate the warranty Instrumentation and accessories shall not be connected to humans Before performing any maintenance disconnect the line cord and all test cables To maintain protection from electric shock and fire replacement components in mains circuits including the power transformer test leads and input jacks m
19. only for qualified service personnel Do not attempt these procedures unless you are qualified to do so NOTE Correctly wire and install the Model 7706 in the Model 2700 before turning on the Model 2700 Use the following steps to verify the Model 7706 Totalizer function KRW NY 32 Connect the function generator to the Model 7706 Totalizer IN and IN terminals see Figure 25 Make sure to leave gate inputs G and G open gate always Set the threshold jumper to the TTL position J2 closed Close and lock the Model 7706 cover NOTE Make sure the Model 2700 is OFF before installing the Model 7706 Install the Model 7706 in slot 1 of the Model 2700 Turn on the Model 2700 Set the function generator to Burst mode Burst cycle count of 50 000 Manual trigger source Output 100kHz 0 5V square wave 50 duty cycle Close CH25 a Press the CLOSE key b Key in 125 Check Totalizer count if count is not zero press EXIT key to clear count 10 11 12 Verify that each time the function generator is triggered to output a burst the Totalizer count increases by 50 000 Open CH25 Press the OPEN key Figure 25 Verification Totalizer connections Function Generato r 500 Coax Cable Ao we f WI WY Function Output
20. set analog output 1 using the front panel under the SHIFT gt CARD menu key in the decimal value for this example 10 0 for the menu item AOUTI XX XX and press enter To set Channel 23 analog output 1 over the bus send the following command OUTP VOLT 10 0 123 NOTES Refer to Front panel operation for more information on menus and key location Voltage may be set in ImV steps values are rounded to the nearest millivolt 15 Model 7706 module Sample 2 Set analog output 2 channel 24 to 5 5V To set analog output 2 using the front panel under the SHIFT gt CARD menu key in the decimal value for this example 5 5 for the menu item AOUT2 XX XX and press enter To set Channel 24 analog output 2 over the bus send the following command OUTP VOLT 5 5 124 Note that each output is referenced to the chassis Each output can not float from each other To operate with the analog output in specification as a calibrated voltage source the minimum resistance load is 2 2kQ refer to Figure 16 Figure 16 Sample analog connection schematic Channel 23 16 bit serial 16 bit serial Channel 24 communication communication lt Channel 23 Channel 24 DAC DA u 2 2kQ 2 2kQ Minimum Minimum GND GND lt 16 Connection Loading effects Loading of the voltage source becomes a consideration for low resistance loads As the source resistance increases the error caus
21. 0 Example CAL PROT CARD1 SAVE Save card calibration constants Calibration commands STEPO CALibration PROTected CARD1 STEPO Purpose To perform Model 7706 temperature calibration Format CAL PROT CARD1 STEPO TEMP Parameter temp Cold calibration temperature C Description STEPO performs temperature sensor calibration of the Model 7706 The card must be allowed to cool down to ambient temperature before calibration and the cold temperature of the card must be measured and sent as the temp parameter during calibration NOTE Before calibrating the temperature for the Model 7706 make sure that power has been removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibration procedure complete the procedure as quickly as possible to minimize card heating that could affect calibra tion accuracy Example CAL PROT CARD1 STEPO 23 Perform 7706 temperature calibration with card at a temperature of 23 C measured with an external probe DAC STEPO CALibration PROTected CARD1 DAC STEPO Purpose To perform Model 7706 analog output DAC calibration Format CAL PROT CARD1 DAC STEPO Parameter none Description STEPO performs analog output calibration of the Model 7706 The card must be allowed to warm up inside the powered up unit for two hours before calibration In this step CH23 analog output 1 must be connected to CH1 and CH24
22. 404 100 vdc full scale error 405 100 vdc full scale error 406 2 w zero error 407 10k 2 w zero error 408 100k 2 w zero error 409 10M 2 w zero error 410 10M 2 w full scale error 411 10M 2 w open error 412 1k 4 w zero error 413 10k 4 w zero error 414 100k 4 w zero error 415 10M 4 w sense lo zero error 416 1k 4 w full scale error 417 10k 4 w full scale error 418 100k 4 w full scale error 419 1M 4 w full scale error 420 10M 4 w full scale error 421 10m adc zero error 422 100m adc zero error 423 10m adc full scale error 424 100m adc full scale error 425 1 adc full scale error 438 Date of calibration not set 439 Next date of calibration not set 450 100m vac dac error 451 1 vac dac error 452 10 vac dac error 453 100 vac dac error 454 100m vac zero error 455 100m vac full scale error 456 1 vac zero error 457 1 vac full scale error 458 1 vac noise error 459 10 vac zero error 460 10 vac full scale error 461 10 vac noise error 462 100 vac zero error 463 100 vac full scale error 464 750 vac zero error 465 750 vac full scale error 466 750 vac noise error 467 Post filter offset error 468 1 aac zero error
23. 44 Replaceable parts Replaceable parts Introduction This section contains replacement parts information and component layout drawings for the Model 7706 Parts lists Both electrical and mechanical parts for the Model 2700 are listed in several tables on the following pages Ordering information To place an order or to obtain information concerning replacement parts contact your Keithley representative or the factory see inside front cover for addresses When ordering parts be sure to include the following information Card model number Model 7706 module Card serial number Part description Component designation if applicable Keithley part number Factory service If the instrument is to be returned to Keithley Instruments for repair perform the following Call the Repair Department at 1 888 KEITHLEY for a Return Material Authorization RMA number Complete the service form at the back of this manual and include it with the instrument Carefully pack the instrument in the original packing carton Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label Component layout A component layout for the Model 7706 circuit board is provided on the pages following the Model 7706 parts list Table 10 Table 10 Model 7706 parts list Circuit Designation Description Keithley Part No 2 4 CAP 1000 10 50V MONO CERAMIC C 452 1000P C13 CAP 47 5 100V
24. 469 1 aac full scale error 470 aac zero error 471 3 aac full scale error 472 Input time constant error 473 Frequency gain error 474 Ohm Ioff Ocomp FS error 475 10K Ohm Ioff Ocomp FS error 476 Temperature Cold Cal error 477 Analog output zero error 478 Analog output pos gain error 479 Analog output neg gain error 500 Calibration data invalid 513 AC calibration data lost 514 DC calibration data lost 515 Calibration dates lost 518 Card calibration data lost 519 Card calibration dates lost 610 Questionable calibration Model 7706 card specific Error queue As with other Model 2700 errors any calibration error will be reported in the bus error queue You can read this queue by using the SYST ERR query The Model 2700 will respond with the appropriate error message as summarized in Table 9 Status byte EAV Error Available bit Whenever an error is available in the error queue the EAV Error Available bit bit 2 of the status byte will be set Use the STB query or serial polling to obtain the status byte then test bit 2 to see if it is set If the EAV bit is set an error has occurred and you can use the SYST ERR query to read the error and at the same time clear the EAV bit in the status byte 43 Model 7706 module Generating an SRQ on error To program the instrument to g
25. 7706 card would be configured from here A sample of accessing the card specific functions is contained in Figure 23 Figure 23 Menu tree Accessing card specific functions Sequence Key Display 1 SHIFT CARD SLOT1 7706 2 ENTER AOUT1 00 000V 3 Y AOUT2 00 000V 4 Y DIGOUT1 255 5 v DIGOUT2 255 6 v TOT TYPE READ RRES 7 Y TOT EDGE RISE FALL 8 Y SWREV A01 Readings mode 9 Y SLOT2 7702 10 ENTER Resumes normal readings since the Model 7702 does not have card specific features that need to be addressed in this menu 26 Bus commands Bus commands When issuing commands over the bus keep the following channel usage in mind Table 3 Channel description Channels Description 1 20 Voltage resistance temperature frequency period etc measurements 21 22 Eight bit digital outputs 23 24 Sixteen bit analog outputs 25 Totalizer 26 2 4 pole selection relay Closing Channel 26 makes a 4 pole measurement 27 Sense terminals to backplane isolation 28 Input terminals to backplane isolation Sending channel numbers Express channel numbers as a three digit number where the first digit is the slot number For example Channel 1 on slot 1 would be Channel 101 and Channel 5 on slot 2 would be 205 The hundreds digit is the slot number and the remaining digits denote the channel number on the card see Channel list parameter located at the bottom of Table 4 27 Model 7706 modu
26. ACE mE 5 S 9 SIE E re m JS ooo od sse d 80 m 88 Oe age la CX e O lt o pa Ed E ooo g E E 5 5 Gr ET OOO oc DO De o o pu o oc 9 248 m o 5 po Ej 912 n 614 p un pa oe gt O mS gt o oel q 3 bo E TEB 68 nma ozy ie o 25 DOES P ea oc 019 ol c 56 00200 O00 Ns ooo 81 131 M TET cso HP MEL So n ooo w 2936 5055 p gt O A 2582 22 Ni S ooo 8 Q ZXXXXXXX L n 652 072 O 3qo2 uve 219 20 SIDE 04 PRIMARY SIDE COMPONENTS 48 Replaceable parts Figure 27 Component layout Side 01 cto cis R45 pa cit 00000000
27. AD or RRES must be done outside of the scanlist configuration Adding to scan list via GPIB The ROUT SCAN command is used to add Totalizer to the scan list When a card that supports Totalizer is in the unit the To talizer channel can only be used as a Totalizer Whenever it is added to the list it will read the current count value The TYPE and EDGE controls are set globally through the SENSe TOTalize EDGE and SENSe TOTalize TYPE commands 21 Model 7706 module Limits and analog trigger The limit subsystem and analog scan triggering works the same for the TOTalize function as for any other Model 2700 function with the exception that only the UPPer limit is evaluated The LOWer limit setting is ignored by the TOTalize function The TOTalizer MUST be monitoring in order to initiate a scan based on a Totalizer limit When a scan is initiated by a TOTalizer count and the Totalizer type is set to READ the limit that initiated the scan is removed from the ROUTe SCAN TSOurce list so that the Model 2700 only runs through the scan list once Otherwise it would keep scanning since the TOTalizer count would remain above the upper limit until reset Totalizer channel monitor scan example For this example Channel 25 of the Model 7706 is used to monitor the Totalizer with the Model 7706 inserted into slot 1 of the Model 2700 This is an example of a four channel scan with Channels 101 103 measuring DC voltage while as previously men t
28. CERAMIC C 465 47P C14 CAP 47P 5 100V CERAMIC C 465 47P C16 CAP 22U 20 25V TANTALUM C 535 22 C17 C22 C23 CAP 0 47U 20 25V C 520 47 C18 C19 C20 C21 C28 C29 CAP 100P 10 100V CERAMIC C 451 100P C39 C40 CAP 47UF 20 20 TANTALUM C 575 47 C41 CAP 10UF 20 25V TANTALUM C 440 10 C42 C43 C44 C45 CAP 1000P 10 100V CERAMIC C 451 1000P C47 CAP 1000pF 2096 50V CERAMIC C 418 1000P C48 CAP 0 01uF 20 50V CERAMIC C 418 01 C7 C9 C10 12 C24 C27 C30 C35 38 46 49 53 CAP 0 1UF 2096 50V CERAMIC C 418 1 CR2 6 25 28 42 44 46 48 43 45 47 49 50 DIODE DUAL SWITCHING BAV99L RF 82 CR26 CR27 DIODE DUAL HSM 2822T31 RF 95 45 Model 7706 module Table 10 Continued Model 7706 parts list Circuit Designation Description Keithley Part No CR29 CR30 CR40 CR41 DUAL HIGH SPEED DIODE RF 147 CR31 32 34 36 38 1 33 35 37 39 DIODE DUAL SWITCHING BAV99L RF 82 CR51 CR54 DIODE DUAL SWITCHING BAV99L RF 82 DIODE DUAL COMMON ANODE CR7 CR22 BAWSGLT2 RF 98 Ji CONN RT ANGLE DUAL ROW RECEPT CS 1065 1 J2 CONN BERG CS 339 K1 K20 K23 SINGLE COIL LATCHING RL 244 K21 K22 NON LATCHING RELAY RL 243 L1 L2 L3 L4 FERRITE CHIP 600 OHM BLM32A07 CH 62 01 02 03 04 053 054 056 058 TRANS NPN SILICON TG 389 Q25 27 29 31 33 35 37 39 41 43 45 47 49 TRANS PNP SILICON TG 388 Q26 28 30 32 34 36 38 40 42 44 46 48 50 TRANS NPN SILICON TG 389 Q5 Q6 P CHANNEL TMOSFET TG 392 51 TRANS PNP SILICON TG 388 Q52 TRANS NPN SILICON TG 389 Q55
29. CK Purpose To lock out Model 7706 calibration Format CAL PROT CARD1 LOCK Parameter None Description The LOCK command allows you to lock out Model 7706 calibration after completing the procedure Thus LOCK performs the opposite of enabling calibration with the CODE command Example CAL PROT CARD1 LOCK Lock out card calibration 39 Model 7706 module LOCK2 CALibration PROTected CARD1 LOCK SAVE Purpose To read Model 7706 calibration lock status Format CAL PROT CARD1 LOCK Response 0 Calibration locked Calibration unlocked Description The LOCK query requests status from the Model 2700 on Model 7706 calibration locked unlocked state Calibration must be enabled sending the CODE command before calibration can be performed Example CAL CARD1 LOCK Request card 1 cal lock state CALibration PROTected CARD1 SAVE Purpose To save calibration constants in card EEROM after the calibration procedure Format CAL PROT SAVE Parameter None Description The SAVE command stores calculated calibration constants derived during Model 7706 calibration in card EEROM EEROM is non volatile memory Calibration constants will be retained indefinitely once saved Generally SAVE is sent after all other calibration steps except for LOCK NOTE Card calibration will be only temporary unless the SAVE command is sent to permanently store calibration constants 4
30. J up PE jo R93 M4 SIDE 01 SECONDARY SIDE COMPONENTS 49 7706 All in One I O Module GENERAL 20 CHANNELS 20 channels of 2 pole relay input All channels configurable to 4 pole RELAY TYPE Latching electromechanical ACTUATION TIME lt 3ms CAPABILITIES CHANNELS 1 20 Multiplex one of 20 2 pole or one of 10 4 pole signals into DMM Channels 21 25 are referenced to chassis ground CHANNELS 21 22 16 Digital Outputs CHANNELS 23 24 Analog Voltage Output 2 CHANNELS 25 Totalize Input INPUTS Channels 1 20 MAXIMUM SIGNAL LEVEL Channels 1 20 300V DC or rms 1A switched 60W 125VA maximum SAFETY CATEGORY CAT I CONTACT LIFE typ gt 105 operations at max signal level 2109 operations no load CONTACT RESISTANCE 1 at end of contact life CONTACT POTENTIAL lt 21 typical per contact pair 3uV max OFFSET CURRENT 100pA CONNECTOR TYPE Screw terminal 22 AWG wire size ISOLATION BETWEEN ANY TWO TERMINALS gt 10 100pF with iso lation channels 27 and 28 open ISOLATION BETWEEN ANY TERMINAL AND EARTH gt 10 lt 200 CROSS TALK 10MHz 50 Load 35dB INSERTION LOSS 50 Source 50 Load 0 1dB below 1 2 3dB below 2MHz COMMON MODE VOLTAGE 300V between any terminal and chassis DIGITAL OUTPUT Channels 21 and 22 Vou 1 0 8V 8 Iout 400mA Vour H gt 2 4V 0 Iout Vour H MAX 42V with external open
31. OUN Response lt n gt Calibration count Description The CARD1 COUNt and CARD2 COUNt commands allow you to determine how many times a Model 7706 in Slot 1 and Slot 2 respectively has been calibrated NOTE Use the COUNt command to help you monitor for unauthorized calibration procedures Example CAL PROT CARD1 COUN Request card 1 calibration count 38 Calibration commands DATE CALibration PROTected CARD1 DATE CALibration PROTected CARD2 DATE Purpose To request the Model 7706 calibration date Format CAL PROT CARD1 DATE CAL PROT CARD2 DATE Response _ year month day Description The CARDI DATE and CARD2 DATE queries allow you to read back the calibration date from a Model 7706 in Slot 1 and Slot 2 respectively NOTE The card calibration date is automatically set to the Model 2700 real time clock date when the card is calibrated Example CAL PROT CARD1 DATE Request card 1 cal date INIT CALibration PROTected CARD1 INITiate Purpose To initiate Model 7706 calibration procedures Format CAL PROT CARD1 INIT Parameter None Description The INIT command enables Model 7706 calibration when performing these procedures over the bus This command must be sent to the unit after sending the CODE command but before performing Model 7706 calibration Example CAL PROT CARD1 INIT Initiate 7706 calibration LOCK CALibration PROTected CARD1 LO
32. Q57 TRANS PNP SILICON TG 388 Q9 Q24 TRANS N MEGAFET RFD14NO5LSM TG 267 R122 R126 R30 RES ARRAY 4x10K 5 0 125W TF 276 10K R13 R14 R17 R18 RES 499K 1 125MW METAL FILM R 391 499K R19 R21 RES 332 10 125MW METAL FILM R 391 332 R1 R12 R15 R16 RES 13K 1 125MW METAL FILM R 391 13K R20 R22 RES 2K 1 125mW METAL FILM R 391 2K R23 RES 28 7K 1 0 125W METAL FILM R 391 28 7K R24 R25 RES 4 75K 1 125mW METAL FILM R 391 4 75K R26 RES 49 9K 1 125MW METAL FILM R 391 49 9K R27 RES 4 99K 1 125mW METAL FILM R 391 4 99K R28 32 34 39 59 63 73 74 76 77 RES 220 5 125MW METAL FILM R 375 220 R29 R86 R87 RES ARRAY 4x4 3K 5 0 125W TF 276 4 3K R31 R38 R40 RES 475 1 1OOMW THICK FILM R 418 475 R36 R37 R41 R46 R75 R85 R35 RES 1K 5 125MW METAL FILM R 375 1K R51 R52 R55 R56 RES ARRAY 4x100K 5 0 125W TF 276 100K R53 54 57 58 94 97 100 102 RES ARRAY 4x10K 596 0 125W TF 276 10K R64 R65 R66 R67 RES 12 4 10 100MW THICK FILM R 418 12 4K R68 R69 RES 40 2K 1 1OOMW THICK FILM R 418 40 2K R70 R71 RES 54 9 1 1000MW THICK FILM R 418 54 9 R78 R79 R80 R81 RES ARRAY 4x1K 5 0 125W TF 276 1K R82 R83 RES 10K 5 125MW METAL FILM R 375 10K R84 RES 100K 5 125mW METAL FILM R 375 100K RV1 RV2 RV3 RV4 BIDIRECTIONAL TRANSIENT VOLT VR 8 SUPPRESSOR 033 SO 143 44 TE1 TE2 CONN FEMALE 12 PIN TE 118 12 TE3 TE4 TE5S TE6 TE7 CONN FEMALE 16 PIN TE 118 10 TP1 TP2 CONN TEST POINT CS 553 Ul IC VOLT
33. Rf value of 137 specifies which terminals are 1 0 8 bit Digital Output 11 Model 7706 module Setting the digital outputs in 16 bit word NOTE Setting the digital output in 16 bit word can be accomplished only over the bus no front panel operation To set the digital outputs in 16 bit send the decimal equivalent of the binary pattern desired similar to 8 bit The binary pattern will be twice as long as the 8 bit pattern requiring both digital output ports Keep in mind that bit 15 is the most significant bit MSB and bit O is the least significant bit LSB This makes the pin 1 screw terminal of Channel 21 TE2 the LSB and the pin 10 screw terminal of Channel 22 the MSB To find the decimal equivalent of the binary pattern first determine the pattern mapped to the screw terminals on the desired digital output refer to the example contained in Figure 12 Setting a bit to a logic 1 effectively sets the screw terminal to 5 V while setting it to a logic 0 sets the screw terminal to OV Then for each screw terminal or bit position multiply the binary value either a 1 or a 0 by the decimal weight see Figure 12 The sum of the products is the decimal equivalent value of the binary pattern This decimal value can be sent over the bus as in the example The digital output allows the use of an external power supply up to 42V Refer to Figure 13 Inductive loads Model 7706 operation is specified f
34. and enable high limit 1 SCAN Y e Disable timer TIMER OFF f Set reading count to 4 4 For front panel operation proceed to step 5 For remote programming set the number of points in the monitor scan ROUT MON POIN 4 5 Select and enable monitor channel SHIFT MONITOR gt 125 ROUT MON 0125 ROUT MON STAT ON Specifications Full Model 7706 specifications are included at the end of this guide Connection log Make a copy of Table 2 and affix it to the cover of the Model 7706 Use this to record connection information and channel de scriptions as needed 24 Connection Table 2 Connection log Model 7706 Channel Color Description INPUT SENSE 2 CH3 4 5 CH6 7 CH9 CHIO CH11 12 CH13 14 5 CH16 CHI7 8 CHI9 CH20 21 B2 B3 B4 B5 B6 B7 GND CH22 BO Bl B2 B3 B4 B5 B6 B7 GND CH23 GND CH24 GND CH25 IN IN G 25 Model 7706 module Front panel operation Card specific menu To open the card specific menu press SHIFT gt CARD CARD is over the RIGHT arrow key This menu contains all card specific functions from the front panel For example the analog outputs of a
35. c of the Totalizer connected to a function generator NOTE The Totalizer can count exactly up to 4 294 967 295 events 232 1 The count resets sets its value to 0 when it reaches 232 Figure 18 Totalizer Function generator Model 7706 module Manual read Bus control Counter Totalizer count Signal conditioner J2 Threshold Selector TTL Close 18 Connection Threshold detection The Totalizer can count events at a rate of up to 100kHz The count can be initiated manually or by configuring a scan When counting the Totalizer can Reset to zero every time it is read Count on the rising or falling edge of the input signal Count AC or TTL signals Be governed by a gate signal Either through a menu Figure 23 or over the bus Table 5 the Totalizer can be configured to read READ or read and reset RRES It can also be configured to which edge of the signal is read rising or falling The type of threshold detected by the Totalizer is set by the position of jumper J2 see Figure 3 Factory default setting for this jumper is closed TTL The TTL wave as well as the AC type wave form are shown in Figure 19 Figure 19 AC and TTL waveforms 2 5V Threshold AC J2 opened f I 0V Threshold The Totalizer counts when both terminals are either enabled or open TTL J2 closed NOTES Threshold levels cannot be programmed or
36. cifically for use with Keithley s Model 2700 Multimeter Data Acquisition System Card configuration schematic Figure 1 shows a simplified schematic diagram of the Model 7706 module As shown the Model 7706 has channels that are grouped into two banks of ten channels twenty channels total Backplane isolation is provided for each bank Each bank also includes separate cold junction reference points The first bank contains channels 1 through 10 while the second bank contains channels 11 through 20 Each channel of the 20 channel multiplexer card is wired with separate inputs for HI LO providing fully isolated inputs NOTE Although the Model 7706 relays are the latching type relays hold their state even after power has been removed all relay states are set to open a few seconds after either a power cycle or an RST command is issued Connections to DMM functions are provided through the card backplane connector for the following INPUT connections SENSE Q4 Wire connections Channels 21 22 digital output 23 24 analog output and 25 Totalizer are controlled either over the bus or from the front panel The grounds for these channels are non isolated Detailed information on each channel is contained later in this section Channel 26 2W 4W Configuration Channel 27 Sense Isolation and Channel 28 Input Isolation are normally automatically configured by the 2700 However by using the ROUT MULT commands refer to Section
37. e sent to Channel 21 NR value of 49288 specifies which terminals are 1 0 16 bit Digital Output 13 Model 7706 module Figure 13 Typical digital output with external power supply Model 7706 Module yee ee f User supplied circuitry Digital Output Terminal Y 4 1 42V Maximum lt Output Digital grou a non isolated referenced to chassis Figure 14 Typical digital output no external power supply Model 7706 Module 5V User supplied circuitry Digital Output Terminal Y Logic Circuit 22 4V 1mA Ge Output Digital ground non isolated referenced to chassis 14 Connection Analog outputs channels 23 24 CAUTION Analog output current limit 5mA maximum The Model 7706 contains two DAC Digital to Analog Converters Use these analog outputs for tasks such as applying a voltage bias to DUTs or analog control The two analog outputs of the Model 7706 are capable of providing voltages in the range of 12V The analog outputs can be set from the front panel or over the bus Figure 15 shows a simplified schematic of the analog outputs Figure 15 Analog output Channel 23 Channel 23 Channel 24 DAC Channel 24 In the following examples the Model 7706 module is in slot one of the Model 2700 Sample 1 Set analog output 1 channel 23 to 10 0V To
38. e te e DTE D E TER Tero Le sasa a Debet Peak Ee ee etg 34 Front panel Model 7706 temperature calibration esee eee nennen nennen nenne nnne 34 Remote Model 7706 temperature calibration na eene nennen entente trennen enne 35 Front panel Model 7706 analog output DAC calibration eese nennen nennen nennen nennen 35 Remote Model 7706 analog output DAC calibration eese nennen nennen nenne nnne nennen ens 36 Calibration commands x r ELE 36 Remote ertor T portmnp u eet t ett be ert o dtu ttr t esee ee td iade deter 42 Detecting cahbration step completion idee ee tetto ed i ee a uu puros e eee oae 44 Replaceable parts zd DE E tote e Cet ie D p Ug bae eet dd SE E top 45 HE 50 Model 7706 module Connection The Model 7706 is a 20 channel differential multiplexer card with the following features 20 channels of analog input with 300V 1 capacity 60W 125VA maximum 16 channels of digital output for output control One event counter Totalizer Two analog outputs 12V 5mA with 16 bit programmability 2 wire or 4 wire measurement automatically pairs switches for four wire measurements 10 Temperature applications RTD thermistor thermocouple Built in automatic cold junction reference CJC Screw terminal connections Designed spe
39. ed by loading increases Figure 17 shows the method used to determine the percent error due to loading where V is the programmed analog output of the Model 7706 15 the total lead resistance of the wiring and connections oad 15 the resistance of the user s circuit Vy is the measured voltage The voltage actually measured by the meter is attenuated by the voltage divider action of Rs and and it can be calculated as follows Vek Vs A ond Ri ead This relationship can be modified to directly compute for percent error R Percent Error lu 100 Ri ead Using the above equation to keep loading error within 0 1 the resistance of the Model 7706 system must be at least 1 999 the value of load resistance Figure 17 Loading effects ead N Vs Source Road Measured Voltage Voltage DAC output errors The DAC output is most accurate when the Model 7706 is operated in stable temperature conditions that are as close as possible to the environmental conditions used for calibration Offset voltage drift over temperature is Im V C Also the offset voltage value may change when changing from slot 1 to slot 2 17 Model 7706 module Totalizer Use the Totalizer to count more than 4 billion on off events contact closures revolutions power cycles etc The Totalizer can be accessed from the front panel or over the bus Figure 18 shows a simplified schemati
40. en press ENTER 9 Set the display value to the cold junction calibration temperature C measured in step 4 then press ENTER to complete Model 7706 temperature calibration QN 34 Calibration Remote Model 7706 temperature calibration O 10 11 Connect the Model 7706 to the 7798 250B Calibration Extender Board With the power off install the Model 7706 7798 combination in Slot 1 and select the rear inputs with the INPUTS switch Press in and hold the Model 2700 OPEN key while turning on the power Allow five minutes for thermal equilibrium Accurately measure and record the cold temperature of the Model 7706 card surface at the center of the card Turn on the Model 2700 power Unlock calibration by sending DIAG KEIT CAL UNLOCK Enable calibration by sending the CODE command For example the default command is CAL PROT CODE 002700 Initiate calibration by sending the following command CAL PROT CARD1 INIT Calibrate temperature on the Model 7706 with the following command CAL PROT CARD1 STEPO temp Here temp is the cold calibration temperature measured in step 4 Send the following commands to save calibration and lock out calibration CAL PROT CARD1 SAVE CAL PROT CARD1 LOCK Front panel Model 7706 analog output DAC calibration 1 N ON Q FW Connect the Model 7706 CH23 and 24 to CH1 and
41. enerate an IEEE 488 bus SRQ when an error occurs send the following command SRE 4 This command will enable SRQ when the EAV bit is set You can then read the status byte and error queue as outlined above to check for errors and to determine the exact nature of the error Detecting calibration step completion When sending remote calibration commands you must wait until the instrument completes the current operation before sending a command You can use either OPC or OPC to help determine when each calibration step is completed Using the OPC query With the OPC operation complete query the instrument will place an ASCII 1 in the output queue when it has completed each step To determine when the OPC response is ready do the following 1 Repeatedly test the MAV Message Available bit bit 4 in the status byte and wait until it is set You can request the status byte by using the STB query or by serial polling 2 When MAV is set a message is available in the output queue and you can read the output queue and test for an ASCII 1 3 After reading the output queue repeatedly test MAV again until it clears At this point the calibration step is completed Using the OPC command The OPC operation complete command can also be used to detect the completion of each calibration step To use OPC to detect the end of each calibration step you must do the following 1 Enable operation complete by sending ESE 1 This comma
42. eset the count to zero and so on 22 Figure 22 Monitor scan example Monitor Mode Close Monitor Channel 125 100 000 Counts TOTALIZER Scan Mode Close First Return to Channel Monitor Mode Open Last Chan Close Next Chan Connection 23 Model 7706 module Table 1 Monitor scan example front panel and remote steps Step Front panel operation Remote programming 1 Restore defaults Restore defaults SHIFT SETUP gt RESTORE FACT RST 2 For front panel operation proceed to step 3 For remote programming clear buffer and disable buffer auto clear TRAC CLE 3 Configure advanced scan SHIFT CONFIG ADVANCED a Channel 101 102 and 103 Select DCV function FUNC VOLT 101 103 Select 10V range VOLT RANG 10 101 103 Set filter count to 20 SHIFT TYPE gt 020 RDGS VOLT AVER COUN 20 101 103 Enable filter FILTER VOLT AVER STAT ON 101 103 b Channel 104 Disable off Channels 104 120 SHIFT CH OFF ROUT SCAN 101 103 125 c Channel 125 Enable Totalizer channel SHIFT CH OFF Set and enable high limit 1 CALC3 LIM1 UPP 1 5 0125 Set limit to 100000 SHIFT LIMITS gt 100 0000 CALC3 LIM1 STAT 8125 Set and enable high limit 2 Set limit to 1000000000 SHIFT LIMITS gt HI2 1000000K ROUT SCAN TSO HLIM1 Enable on limit SHIFT OFF ON LIMITS ON d Disable immediate scan IMM SCAN N
43. hannel 21 SENSe 1 Subsystem Commands to perform Model 7706 specific operations are listed in Table 5 Table 5 Sense subsystem commands Command Description Default SENSe 1 Path to the SENSe 1 commands TOTalize Path to configure 7706 Totalizer lt READ RRESet gt lt clist gt RRESet read and reset causes the Totalizer count to be READ reset to zero every time it is read lt clist gt Query Totalizer count readback type EDGE lt RISing FALLing gt lt clist gt Set which edge of the input signal to count RIS EDGE lt clist gt Query trigger edge for the Totalizer DATA lt clist gt Query the current Totalizer count This command will reset the count to 0 if TOT TYPE is set to RRESet Channel list parameter lt clist gt SCH where S Mainframe slot number 1 or 2 CH Switching module channel number must be 2 digits Examples 101 Slot 1 Channel 1 101 203 Slot 1 Channel 1 and Slot 2 Channel 3 101 110 Slot 1 Channels 1 through 10 29 Model 7706 module Unsupported SCPI commands NOTE The display will indicate which cards are installed immediately after showing the firmware revision at power up The ROUT SCAN NVOLatile command is not supported for Model 7706 module operation Attempts to set ROUT SCAN NVOL ON with a 7706 card present in either slot will generate error 221 settings conflict Verification Use the procedure
44. ioned Channel 125 monitors the Totalizer As programmed when the Totalizer reaches 100 000 counts the scan is initiated Operation A simplified model of scan operation is contained in Figure 22 The procedure for front panel operation and equivalent program ming commands for this simplified model is contained in Table 1 For this example there are two modes of operation monitor and scan see Figure 22 While in monitor mode continuous Totalizer measurements are performed The instrument remains in the monitor mode until it reaches the high limit in this example the high limit is set to 100 000 counts When this limit is reached the instrument changes over to scan mode see Figure 22 The instrument is configured to scan four channels three DCV readings and the Totalizer channel the buffer stores all four readings After the fourth channel is measured operation turns again to the monitor mode to again measure Totalizer NOTE When scan is initiated by a TOTalizer count with the type set to READ the limit that initiated the scan is removed from the ROUTe SCAN TSOurce list This makes the unit run the scan list once Otherwise scan ning would continue until reset as long as the TOTalizer count remains above the upper limit If the type is set to RRES when a scan is initiated and after the Totalizer channel is scanned it is reset to zero 0 If the Total izer again counts past the high limit set the unit will run the scan list again r
45. le OUTPut Subsystem Commands to perform output operations are listed in Table 4 Details on these commands follow the table NOTE The output subsystem is specific to the Model 7706 module It is only available if a Model 7706 is installed Table 4 Output subsystem commands Command Description Default OUTPut Set the output of a 7706 channel VOLTage lt NRf gt lt clist gt Forces the analog output of the given analog channel s to the desired 0 0 values in volts from 12 to 12 VOLTage lt clist gt Query the present voltage for the analog output channel s DIGital Path to the digital commands BYTE lt nrf gt lt clist gt Force the digital output of the given channel s to the desired value 255 0 x 255 in decimal format BYTE lt clist gt Query the present bit pattern 0 lt x lt 255 for the digital output channels WORD lt nrf gt lt clist gt Force the digital output of the given channel s to the desired value 65535 0 x 65535 in decimal format WORD lt clist gt Query the present bit pattern 0 x 65535 for the digital output channels returned in decimal format Channel list parameter lt clist gt SCH where S Mainframe slot number 1 or 2 CH Switching module channel number must be 2 digits Examples 101 Slot 1 Channel 1 101 203 Slot 1 Channel 1 and Slot 2 Channel 3 101 110 Slot 1 Channels 1 through 10 OUTPut
46. nd sets the OPC operation complete bit in the standard event enable register allowing operation complete status from the standard event status register to set the ESB event summary bit in the status byte when operation complete is detected 2 Send the OPC command immediately following each calibration command For example CAL PROT DC STEPI OPC Note that you must include the semicolon to separate the two commands and that the OPC command must appear on the same line as the calibration command 3 After sending a calibration command repeatedly test the ESB Event Summary bit bit 5 in the status byte until it is set Use either the STB query or serial polling to request the status byte 4 Once operation complete has been detected clear OPC status using one of two methods 1 Use the ESR query then read the response to clear the standard event status register or 2 send the CLS command to clear the status registers Note that sending CLS will also clear the error queue and operation complete status Generating an SRQ on calibration complete An IEEE 488 bus SRQ service request can be used to detect operation complete instead of repeatedly polling the Model 2700 To use this method send both ESE 1 and SRE 32 to the instrument then include the OPC command at the end of each cal ibration command line as covered above Refer to your controller s documentation for information on detecting and servicing SRQs
47. nly This document is arranged as follows Description Page Connection Card configuratior Sschematic cesare e eee er d e fd dee e presi 2 Card configuration connectlons 4 Wiring procedure n tte e au m ot ten 5 Typical connections channels 1 20 5 3 eee eerte Ue ertet eese 7 Digital outputs channels 21 22 ite erre e e teo e s tede 9 Analog outputs channels 23 24 siete e I ere ted ed e aula s RD Most overt ge ethane 15 Hr e 18 Totalizer channel monitor scan 22 k apay aa a eL SS A esee ede us 24 Connection NOG eve Pc 24 Front panel operation Card specific menu sd e u nt iei ebore iode eee io ee ete de e dee UE pee 26 Bus commands Sending channel numbets ERE UR 27 56 ia asics eere e Ce 28 SENSeLlI J Subsystem 2uu k EE 29 Unsupported SCPE commands de uer e Et den eee 30 Verification Analog outputs tee uote t quentes 30 PE 32 Calibration R comiended test equipment idee eee treo ti ee de Ex ele epe e n ee 34 Extender board connections d tecto
48. o the equipment and within easy reach of the operator For maximum safety do not touch the product test cables or any other instruments while power is applied to the circuit under test ALWAYS remove power from the entire test system and discharge any capacitors before connecting or disconnecting cables or jumpers installing or removing switching cards or making internal changes such as installing or removing jumpers Do not touch any object that could provide a current path to the common side of the circuit under test or power line earth ground Always make measurements with dry hands while standing on a dry insulated surface capable of withstanding the voltage being measured The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the equipment may be impaired Do not exceed the maximum signal levels of the instruments and accessories as defined in the specifications and operating information and as shown on the instrument or test fixture panels or switching card When fuses are used in a product replace with the same type and rating for continued protection against fire hazard Chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections If you are using a test fixture keep the lid closed while power is applied to the device under test Safe operation requires the use of a lid interlock Ifa screw
49. or resistive loads Reactive inductive loads require voltage clamping Before using induc tive loads take adequate circuit protection measures refer to the appropriate appendices of the Model 2700 User s Manual 12 Connection Figure 12 Sample sending a digital output word 16 bit O Z Z Z Z Digital CENT omer Digital SISISISISISISISISIS x propr spes ud alt 7 6 5 4 3 2 10 7 6 5 4 3 2 1 5 terminal label 815 B14 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 BO BitPosition 0 1 0 1 0 1 O 1 Binary Value 215 214 213 212 211 010 09 08 27 26 25 24 23 22 21 20 weights 32768 16384 8192 4096 2048 1024 512 2 128 64 32 16 8 4 2 1 Equivalent decimal weight IISISISISISISISISIS ISISISISISISISISISIS 7 6 5 4 3 2 1 O 7 6 5 4 3 1 1 0 0 0 0 1 0 0 0 1 Binary Value 32768 16384 8192 4096 2048 1024 512 256 128 64 32 16 8 Decimal weight 32760416304 0 0 0 0 0 0 128 0 0 0 8 0 0 0 49288 this is the NRf value in the Therefore the command to send is command OUTP DIG WORD 49288 121 Channel 21 of the Model 7706 in slot 1 this command can only b
50. ple connections Channel 1 i Channels 2519 Thermocouple i HI Channel 20 LO Figure 6 Q2 Wire and thermistor connections Channel 1 Channels 2 19 e Resistor or i Thermistor HI Channel 20 LO Connection Model 7706 module Figure 7 Q4 Wire and RTD connections RTD Q4 Wire lt Channel 1 LO Channels2 9 1 e HI lt Channel 10 LO 2 i HI Channel 11 LO Channels 12 1 9 Channel 20 LO Figure 8 Voltage connections DC or AC DC Voltage AC Voltage Channel 1 Channels 2 19 2 lt i HI T Channel 20 Connection Digital outputs channels 21 22 Use the Model 7706 digital outputs to control indicators fixtures switches solenoids loads relays etc Figure 9 shows a sim plified schematic of the digital output Figure 9 Simplified schematic of digital output Bit 0 1 2 3 4 Channel 21 5 6 Digital 7 Output 0 1 2 Channel 22 5 6 7 pM Non isolated Reference to chassis ground Setting the digital output in 8 bit byte To set the digital output send the decimal equivalent of the binary pattern desired Keep in mind that on each port bit 7 is the most significant bit MSB and bit O is the least significant bit LSB This makes the pin 1 screw terminal of each digital port and the LSB and pin 10 the MSB NOTES is Channel 21
51. ront panel key operation Totalizer 20 Connection 1 Special keys and power switch Normal operation 2 Function and operation keys Top Row Unshifted DCI ACI Q2 04 FREQ TEMP Blocked Shifted RATIO CH AVG CONT OCOMP PERIOD Blocked Middle Row Unshifted TRIG Triggers the unit to read the current Totalizer count lt and gt Moves between Totalizer channels if more than one Model 7706 installed STORE RECALL FILTER REL Blocked Shifted LIMITS Sets the High Limit count for the Totalizer ON OFF Enables disables limits MONITOR Sets unit to monitor Totalizer channel and turns monitor on If monitor is already on it will be turned off CARD Enters the card specific menu DELAY HOLD Normal Operation TYPE CH OFF Blocked Bottom Row Unshifted OPEN CLOSE Normal operation EXIT Clears the Totalizer count to zero STEP SCAN DIGITS RATE ENTER Blocked Shifted SAVE SETUP CONFIG TEST GPIB RS 232 Normal operation LSYNC Blocked 3 Range keys A and V Normal operation AUTO Blocked 4 INPUTS switch Normal operation the position of this switch does not affect Totalizer operation Adding Totalizer to scan list via front panel Toggle the state of the Totalizer channel in the scan list using the SHIFT gt CH OFF key The TYPE and EDGE controls are set globally through the SHIFT gt CARD menu key NOTE Changing Totalizer settings RE
52. s contained in this section to verify the analog outputs or the Totalizer Analog outputs WARNING The information contained in this section is intended only for qualified service personnel Do not attempt these procedures unless you are qualified to do so NOTE After correctly wiring the Model 7706 installing it in the Model 2700 and turning the power on step 5 in the following procedure the unit is required to warm up for two hours before proceeding Use the following steps to verify the Model 7706 analog output channels O tA 10 11 12 13 30 Connect CH23 H and L outputs to CH1 H and L input terminals respectively Connect CH24 H and L outputs to CH2 H and L input terminals respectively Close and lock the Model 7706 cover Install the Model 7706 in slot 1 of the Model 2700 Turn on the Model 2700 Allow unit to warm up for two hours before proceeding Set the front panel INPUTS switch to the REAR position Set the Model 2700 to the 10V range a Select the DC volts function by pressing the DCV key b Select the 10V range Close channel 1 a Press the CLOSE key b Key in 101 Set analog output 1 to 10V a Open the SHIFT CARD menu press SHIFT CARD b Key in analog output for AOUT1 10 000V Verify analog output reading is within stated limits see Table 6 Set analog output 1 to 10V a Open the SHIFT CARD menu press SHIFT CARD b Key in analog o
53. scanner Slot 1 Note that the module being calibrated will be external to the Model 2700 to avoid card heating during calibration Table 7 Recommended calibration equipment Description Digital thermometer 18 to 28 C 0 1 C Keithley 7798 250B Calibration Extender Board Front panel Model 7706 temperature calibration NOTE Before calibrating the temperature on the Model 7706 make sure that power has been removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibration procedure complete the procedure as quickly as possible to minimize card heating that could affect calibra tion accuracy Allow the Model 2700 to warm up for at least two hours Connect the Model 7706 to the 7798 250B Calibration Extender Board With the power off install the Model 7706 7798 combination in Slot 1 and select the rear inputs with the INPUTS switch Press in and hold the Model 2700 OPEN key while turning on the power Allow five minutes for thermal equilibrium Accurately measure and record the cold temperature of the Model 7706 card surface at the center of the card Press SHIFT then TEST then display TEST CALIB with the up or down range key Press ENTER select RUN then enter the appropriate calibration code default 002700 Using the up or down range key select CARD at the CAL RUN prompt then press ENTER Using the up or down range key select TEMP th
54. see Figure 4 Figure 4 Wire dressing fully wired module Note Secure wiring to 7706 using cable ties through cable tie hole Analog input Channels 1 20 Digital wiring Earth based outputs Supplementary insulation 2 places S WARNING Cable tie 8 places Channel 21 Channel 22 circuits y and analog ooo A ooo ooo Ej ooo o 931 ooo Ej ooo ooo g ooo o 000000000g 0000000001 aL 5 ooo ol 000 9 ooo ooo 9 ooo O 0 0 0 0 0 o Ojo 0 0 0 o o 0 ooo ooo s ooo 8o000000000 8000000000 amp 1100000008 n ooo 6 ooo ooo High voltage connection Totalizer connection Channel 23 Channel 24 Typical connections channels 1 20 The following examples show typical wiring connections for the following types of measurements Thermocouple connections see Figure 5 Q2 Wire and thermistor connections see Figure 6 e 4 Wire and RTD connections see Figure 7 Voltage AC or DC see Figure 8 Figure 5 Thermocou
55. set 19 Model 7706 module Gating provides specific control over when the Totalizer readings are taken A gate always is interpreted if no gating signal is present To control counting through the G screw terminal send a TTL high signal to enable counting and a TTL low signal to disable counting To control counting through the G screw terminal send a TTL low signal to enable counting and a TTL high signal to disable counting The Totalizer can be controlled from the G screw terminal the G screw terminal or both both G and G screw terminals have to be enabled to count Samples of Totalizer input with gating are contained in Figure 20 Figure 20 Sample totalizer input with gating added to Totalizer count Rising edge detection IN 2 TTL J2 closed 2 5V Threshold 9 0 G open E E NS c Counting enabled G HIGH e GND b Viewing Totalizer count View the Totalizer count by using the CLOSE key and entering the Totalizer channel number front panel This opens all relays switches the Model 2700 function to Totalizer TOTALIZE and remembers the previous function In this mode the TOTalize TYPE setting is ignored effectively READ The front panel of Model 2700 is shown in Figure 21 When viewing the Totalizer count the Model 2700 keys function as con tained in the list keyed to Figure 21 Figure 21 Model 2700 f
56. talizer H CH8 L Threshold jumper H J2 position CH9 L Source 1 2 TTL H L Clear Sine wave CH10 Sense Analog input Wiring procedure WARNING The information in this section is intended for qualified service personnel Do not attempt to perform this procedure unless qualified to do so Use the following procedure to wire the Model 7706 module Make all connections using correct wire size up to 22 AWG Also make sure to add supplementary insulation around the harness for voltages above 42V peak see Figure 4 Model 7706 module All wiring must be rated for the maximum voltage in the system For example if 1000V is applied to the WARNING front terminals of the Model 2700 the plug in module wiring must be rated for 1000V 1 Make sure all power is discharged from the Model 7706 module 2 Access the screw terminals see Figure 2 3 Using a small flat blade screwdriver loosen terminal screws and install wires as desired Figure 4 shows connections to all channels 4 Route wire along wire path and secure with cable ties as shown see Figure 4 5 Fill in a copy of the connection log Table 1 and affix it to the module cover 6 Close and lock cover The Model 7706 module provides connections for both high voltage analog measurements as well as dig ital earth based circuits Make sure to install and maintain double insulation between the analog and digital circuit wiring using supplementary insulation as required
57. ust be purchased from Keithley Instruments Standard fuses with applicable national safety approvals may be used if the rating and type are the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component note that selected parts should be purchased only through Keithley Instruments to maintain accuracy and functionality of the product If you are unsure about the applicability of a replacement component call a Keithley Instruments office for information To clean an instrument use a damp cloth or mild water based cleaner Clean the exterior of the instrument only Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument Products that consist of a circuit board with no case or chassis e g a data acquisition board for installation into a computer should never require cleaning if handled according to instructions If the board becomes contaminated and operation is affected the board should be returned to the factory for proper cleaning servicing KEITHLEY Model 7706 All in One module Connection operation calibration and parts information Introduction This packing sheet contains information specific to the Model 7706 module If you have any questions after reviewing this in formation please contact your local Keithley representative or call one of our Applications Engineers at 1 800 348 3735 U S and Canada o
58. utput for AOUTI 10 000V Verify analog output reading is within stated limits 14 15 16 17 18 19 Close channel 2 a Press the CLOSE key b Key in 102 Set analog output 2 to 10V a Open the SHIFT CARD menu press SHIFT CARD b Key in analog output for AOUT2 10 000V Verify analog output reading is within stated limits Set analog output 2 to 10V a Open the SHIFT CARD menu press SHIFT CARD b Key in analog output for AOUT2 10 000V Verify analog output reading is within stated limits Open channel 2 press the OPEN key Figure 24 Verification analog connections uu oooooooooGgoooooooool o o ls Booo000000 F000000000 eo0000000n C000000000 6 000 ooo ooo 7 H Md MdL amp 1j00000008 ooop Table 6 Analog output limits Source DC Voltage Reading limits 1 year 18 to 28 10 9 966 10 034 0 15 of reading 19mV 10 10 034 to 9 966V Verification 31 Model 7706 module Totalizer WARNING The information contained in this section is intended
59. www keithley com Model 7706 Multiplexer User s Guide PA 719 Rev D August 2010 The Model 7706 can be used with Keithley Models 2700 2701 and 2750 All references to the Model 2700 also apply to the Models 2701 and 2750 KEITHLEY A GREATER MEASURE CONFIDENCE KEITHLEY Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation Although some instruments and accessories would normally be used with non hazardous voltages there are situations where hazardous conditions may be present This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury Read and follow all installation operation and maintenance information carefully before using the product Refer to the user documentation for complete product specifications If the product is used in a manner not specified the protection provided by the product warranty may be impaired The types of product users are Responsible body is the individual or group responsible for the use and maintenance of equipment for ensuring that the equipment is operated within its specifications and operating limits and for ensuring that operators are adequately trained Operators use the product for its intended function They must be trained in electrical safety procedures and proper use of the instrument
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