M622 Precision Resistance Decade
Contents
1. a a e T E N E a Ea a EERE 13 7 PERFORMANCE VERIFICATION TEST esesseesscsecsseceesoecescoccsscceesseceecsecseoocesscceesscceesoecescsecsssceesseseessee 16 8 REMOTE CONTROL vssissssssissscccoasscscsscssssscoscsessesseasseseesseasaodsssescosesessess desesecssssconcsonsscasesecs oassieseseassessssssess 18 8 1 S oa E E E EE EE 18 8 2 COMMAND IST orien EE ESER EEEE EEEa EE AE EE EEEE ER AEE EE EE EE AEE EEEE Ee 18 8 3 REMOTE CONTROL EEAO ENEAS EREN 21 8 4 REMOTE CONTROL 21 8 5 DEMO PROGRAM 22 9 MODULE 19 EXTRA ORDERED OPTITON ccsscssssssssssssssssssscsssscsssscsssssssssssssssssssssesssssssssessssssssees 23 10 ELECTRIC PUNCTION osisissssscossccsscesssssssvecsesscesssosssssdsscnsesssecesscssassdssvesesessuasosesssssesscsnscsiscesecebessvaseaseses 23 11 MECHANICAL CONSTRUCTION ccccissssoccssossovsesonccedesoscsssscasseessecssnseosssessecessessecssenescossensossensscssocscnses 23 ILL SUI A Gio a 23 LUZ BATTERY REPLACEMENT 24 12 ORDERING INFORMATION OPTIONS sssccsssssscesssscccssssccscsssccsssssccccssssccccsscessessscescesssccscssseses 24 3 Version 23 Operation manual MEATEST M 622 Precision Resistance D2. are displayed Arrow symbol in right corner informs that cursor function of keys 2 4 6 8 is initialized blue signs on front panel foil Buttons 7 4 enable step up or down number on active position With buttons lt active position of cursor can be moved left or right With button ENTER can be switched between cursor and numerical keyboard in this mode After pushing the key MENU SETUP function is activated Use of cursor keys Cursor keys T 4 enables to increase or decrease the number on active position Active position is signed by symbol _ under the number place With cursor keys lt active position of the cursor can be changed Pushing the key ENTER switches keys 2 4 6 8 function between cursor and numerical Numerical keyboard With numerical keys value of temperature or resistance can be directly entered Recently entered value is displayed in brackets under the actually set value To confirm new value push the key ENTER 168 868 C C 162 8 1 Pushing the key ENTER switches keys 2 4 6 8 function between cursor and numerical Press ESC key to exit setting value from numerical keyboard mode BSP key deletes last entered number 6 3 Setup mode This mode enables to set or display some auxiliary parameters To enter this mode push the key Function Prise t Operation manual 10 M 622 Precision Resistance Decade MEATEST MENU in standard mode To leave setup mode push the k
3. on terminals R4W lt 1 ppm C 100 1200 on terminals R2W lt 5 ppm 2 10 on terminals 0 3 W 50 V DC 50 Vef AC on terminals R4W 120 V DC 50 Vef AC on terminals R2W 2 4 wire 2 3 or 4 wire 6 ms instrument terminals diameter 4mm gold plated RS232 as standard IEEE488 optionally internal battery 12 V type LONG B WP 1 9 12 power line adapter ISVDC 2A 100 240 V 6 hours 18 28 5 40 10 50 C ALU W 364 mm H 111 mm D 316 mm without holder W 483 mm H 133 mm D 316 mm 4 5 kg gt 2 GQ at 500V DC Reaction time means time interval between setting up value from front panel or receiving command from remote control bus and settling set up value on output terminals Notes e Only data shown with tolerance or with band of limits are tested All other values have informative character e During over switching resistance circuit may be opened for a period about I ms Operation manual MEATEST M 622 Precision Resistance Decade Accuracy Specified accuracy is valid after 10 minutes warm up in temperature range 23 5 oC Uncertainties include long term stability temperature coefficient linearity load and line regulation and traceability of factory to National calibration standards Accuracies assigned in are related to the set value Specified accuracy is one year accuracy Resistance accuracy terminals R4W Res
4. panel External power supply connector and RS 232 connector are located on the rear panel Internal battery is fixed to the rear panel inside the housing 11 1 Battery maintenance Period for fully battery charging is approx 40 hours If the instrument has been stored for more than 3 months without connected external power line adapter battery should be charged 23 Operation manual MEATEST M 622 Precision Resistance Decade 11 2 Battery replacement Internal battery is sealed lead acid maintenance free long life rechargeable battery with voltage 12V and capacity 2 6Ah To replace battery use following procedure e Disconnect external power supply adapter and RS 232 IEEE488 cable e Switch decade off e Dismount 4 screws located in the corners of the rear panel e Remove slightly top cover e Disconnect connectors from the battery and dismount metal belt to release battery e Replace battery pack e Connect fresh battery and mount it into the case in opposite procedure 12 Ordering information options Bus M622 V1xxx RS232 M622 V2xxx IEEE488 Additional functions M622 Vx0xx none M622 Vx1xx Short Open function Housing M622 Vxx0x table version M622 Vxx1x module 19 3HE Manufacturer MEATEST s r o Zelezna 509 3 619 00 Brno Czech Republic www meatest com Operation manual tel 420 543 250 886 fax 420 543 250 890 meatest meatest cz 24
5. provide easy operation of the instrument from the computer and to check the RS 232 line TEEE488 bus of the instrument The installation CD ROM contains a program for MS WINDOWS only you can communicate with the instrument through standard serial line IEEE488 with For example you can set value or function on the decade For IEEE488 connection this DecadeAssistant requires properly configured National Instruments IEEE488 card Download on www meatest com Operation manual 22 M 622 Precision Resistance Decade MEATEST 9 Module 19 extra ordered option RTD simulator can be ordered as 19 module for easy assembling into a 19 rack Module height is 3HE M612 Precision RTD Simulator sasea 8 E ENEE 132 5 10 Electric function Resistance elements are switched to the output terminals through reed relays in binary code system The relays used are types with low thermoelectric voltage The resistors are of foil or metal type with low temperature coefficient Metal housing is connected to the ground terminal only The board with resistors and relays creates independent mechanical block CPU unit with one chip micro controller generates all necessary internal control signals Calibration data and set up parameters are saved in EEPROM memory 11 Mechanical construction Decade housing is standardised aluminium type one Keyboard with display and output terminals are located on the front
6. temperature parameter is used both negative and positive values are acceptable For resistance parameter positive value only is acceptable Limit values are shown in chapter Technical data In case of control the decade confirms correct setting with string lt cr gt lt If gt In case of query M 622 returns set resistance temperature value in the same format as it is on the display number of decimal places For example value 120 C is returned as 120 000 lt cr gt lt lf gt Positive numbers are sent without polarity sign Example Command A123 564 lt cr gt sets temperature 123 564 C if decade is in temperature simulation function and 123 564 if decade is in resistance function Operation manual 18 M 622 Precision Resistance Decade MEATEST If query A lt cr gt is sent decade returns response in format 123 564 lt cr gt lt lf gt Decade function setting F lt CPD gt 0 1 2 3 4 5 S O Following function can be set e 0 resistance mode e Pt 68 temperature sensor simulation e 2 Pt 90 temperature sensor simulation e 3 Pt US temperature sensor simulation e 4 Ni temperature sensor simulation e 5 User temperature sensor simulation 5 Short simulation extra ordered option e O Open simulation extra ordered option M 622 confirms execution with string lt cr gt lt If gt Example F1 lt cr gt sets 100 sensor simulation I D device i
7. M 622 Precision Resistance Decade Operation manual MEATEST M 622 Precision Resistance Decade MEATEST Content 1 USE OF THE INSTRUMEN 4 2 CONTENTS OF DELIVERY ocsessssvesessesescoocesescevcosenssesussesossusesscenssssevsosesssosessssendecessensessssevdsvesseessdeusveceses 4 3 TECHNICAL DATA cis cssssscsccssccssssssssssssessessssscascssssccasesssssvaseaeesesvsescsvasessssessesassssceaeasess soacbasoaasscaessessssseseasess 4 4 PREPARATION FOR USE cssssscoscsscscosscsssssssccsccesssssscosssscssebeesescstssssesssssisscnssessccvssesvasaisesnacossocescosensasdssseteess 7 4 1 7 4 2 WARM UP TIME a 7 S DPESCRIPTION sscscvcsccniscsssccscvsstecscenseevacenscssdctesescnctussvesctesassassesseaseseessccsusdeucceesssvessesseessuasecdscessevoscaasescdusaeess 7 Del FRONT AED seed oe ta eas Ae 7 9 2 REAR E 9 6 OPERATION csssssescssicvescessscsscssecescessiessceadessscaseossbateseessasssavssscssensdsessousscdsuvousesssouvsessdaccsdessdsssceavesescassessacsacess 9 6 1 SWICHONAND OFT Aas hee 9 6 2 STANDARD MOD Borca nornerne ESTAT NEETER E RE ee a en Lee ee ee 10 6 3 EE A E AE E E EA E E 10 6 4 CAPRA TON a aae a R E a a e
8. M 622 returns device status in form FxUx lt cr gt lt lf gt On positions of signs there are values corresponding to the actual status of decade Example After query V lt cr gt decade returns for example string F2U0 lt cr gt lt If gt which means Pt 90 C actual setting Setting reading of value for switching over terminals 2W 4W W lt DNPD gt This command sets value where output resistance is switched from R4W to R2W and back lt DNPD gt It represents resistance value in Q Limits are shown in chapter Technical data M 622 confirms execution with string lt cr gt lt If gt In case of query M 622 returns set value in Example 2000 lt cr gt sets value to 2000 Q After query W lt cr gt decade returns string 2000 lt cr gt lt If gt When unknown command is received M 622 returns string lt cr gt lt If gt Correctly executed command is confirmed with string Ok lt cr gt lt lf gt When correct query is received M 622 returns response in above described format All commands must contain sign lt cr gt or lt lf gt at the end Both small and large letters can be used Operation manual 20 M 622 Precision Resistance Decade MEATEST 8 3 Remote control RS232 Transmission baud rate can be selected from 300 to 19200 Bd Number of data bits is 8 number of stop bits is 1 parity is not used For data flow control neither hardware handshake
9. RS232 IEEE488 optionally internal battery is out of power D O power line adapter is connected Output terminals Output resistance is available on either R4W or on R2W output terminals Upper four terminals R4W enable 2 and 4 wire connection of resistance decade and 2 3 and 4 wire connection if decade is used as Pt Ni temperature sensor simulator Resistance range on these terminals is from 1 Q to maximal R 10 kQ Upper limit R depends on setting of parameter 4W lt 2W Lower line of terminals with label R2W can be used for two wire connection only Total resistance range on these terminals is from R 1 Q to 1 2 MQ Value of lower limit R depends on setting of parameter 4W lt 2W Decade automatically switches between R2W and R4W output terminals according to resistance value Low resistance values are connected always to R4W terminals Resistance value where over switching from R4W terminals to R2W terminals is performed can be set in MENU parameter 4W lt 2W Range of this point setting covers values from 0 Q to 10 KQ and can be set with 1Q resolution Resistance of preset 4W lt 2W value is always available still on R4W terminals When 4W lt 2W value is set to 0 Q R2W terminals are used as output only Recommended 4W lt 2W value is 2000 Q Active terminals are indicated with lighting LED diode on front panel Left terminal with symbol GROUND is connected with the housing Operation manual 8 M 622 Precis
10. RTS CTS nor program handshake XON XOFF is used RS 232 line is from other electronic circuits galvanically isolated RS 232 connection 1 5 Pin Label VO Description 2 TXD output Transmitter 6 9 3 RXD input Receiver 5 GND Ground 9 pin connector D SUB MALE Cable between decade and computer description configuration 1 1 D Sub 1 D Sub 2 622 8 4 Remote control 488 optionaly The list of commands is valid for version of decade with IEEE488 interface The instrument performs the following functions based on IEEE488 bus commands SH1 AH1 T5 L3 RL1 DC1 The instrument also recognizes the following general commands DCL Device Clear resets the instrument to its basic state SDC Selected Device Clear resets the instrument to its basic state Bo GTL Local switches the remote control off 004 Dios LLO Local Lock Out switches the local control off the instrument TW PAIR cannot controlled from the front panel NDAC SRQ GND TW PAIR W NDAC GND TW PAIR W IFC GND TW PAIR W SRQ ATN GND TW PAIR W ATN SHIELD 12 SIGNAL GROUND Commands are identical to the commands for RS 232 interface Detailed description is shown in chapter 8 2 21 Operation manual MEATEST M 622 Precision Resistance Decade 8 5 Demo program A simple operating program DecadeAssistant is supplied with the decade in order to
11. ance values in range 1 Q 1 2 MQ are calibrated absolutely Resistance value is not defined against SHORT position Functions Short and Open positions are intended only for functional checking of tested instrument Operation manual 6 M 622 Precision Resistance Decade MEATEST 4 Preparation for use M 622 Resistance decade is supplied from internal battery or from external power line adapter Range of power line voltage is from 100 V to 240 V 50 60 Hz M 622 is laboratory device Its accuracy is guaranteed in temperature range 23 5 C Instrument is aimed for use in horizontal or slope position The angle of slope is determined by downcast holder After unpacking put the instrument on flat desk If the instrument was stored out of range of reference temperatures let it stabilize for one hour 4 1 Switching on If the instrument is supplied from internal battery only push the button POWER If power line adapter is connected decade will switch on automatically After switching on internal tests are performed for approx 3s On the display type name of the instrument and manufacturer are displayed during internal test After finishing setting to the position before last switching off is performed Factory setting is resistance mode value 100Q 4 2 Warm up time Decade can operate immediately after switching on After 10 min warm up period it meets specified accuracy During warm up period it is not recommended to perform recali
12. anged in MEATEST Company only extra ordered option Please specify in your order Short simulates short on the output terminals Function Short is extra ordered option Open simulates open on the output terminals Function Open is extra ordered option Items from MENU are displayed on lower row After selecting an item and pressing the button ENTER symbol of this new selected temperature resistance function is written to upper row Selected function is valid even if the instrument is switched off and on again except of Short and Open functions RO Pt Ni resistance at 0 C The function enables to set up parameter RO for temperature sensors Set value RO is valid for both Pt and Ni sensors New value can be written after changing keyboard meaning to numerical by pushing ENTER Allowed range is from 10 to 20 000 Q To confirm new value press ENTER New value 15 valid even if the instrument is switched off and on again 4W lt 2W the highest resistance value on R4W terminals The function enables to pre set resistance value where instrument automatically switches active output terminals from R4W to R2W and back Resistance values higher than 10 000 Q are available only on terminals R2W Lower values than 10 000 can be available either on R2W terminals but with a little bit worse accuracy or on R4W terminals with the lowest uncertainty Resistance point where decade swiches between both terminals can be modificated here New va
13. bration 5 Description Front panel M 622 Precision Resistance Decade ROWER 168 668 C 568 t MEATEST On the front panel there are located all main control keys display and output terminals Keyboard Numerical values can be entered from the numerical part of keyboard Keys with number 2 4 6 8 have also next meaning as display cursor keys Except numerical there are following keys in the keyboard 7 Operation manual MEATEST M 622 Precision Resistance Decade Key Meaning MENU enters to the SETUP CALIBRATION MENU BSP deletes last entered number ESC cancels last entered value or leaves last set mode ENTER confirms set value or confirms selected item in MENU or switches between numerical function black label and display cursor function blue label of the keys 2 4 6 8 Switching over is indicated with symbol 7 in right low corner of the display POWER switches on and off the decade When switching off is requested two times the key must be pushed to confirm switching off Display Two row alphanumerical display is used for displaying all information Main value i e simulated temperature or output resistance is displayed in upper row Auxiliary information is displayed in lower row Depending on status following symbols can be displayed in right low corner keys 2 4 6 and 8 are switched to the cursor function blue labels are valid decade is in remote control via
14. d off and on again Note it is advisable to write down actual password if changed If you forget the calibration code you have to send the decade to the manufacturer Serial number Displays the serial number of the decade The parameter cannot be changed Operation manual 12 M 622 Precision Resistance Decade MEATEST 6 4 Calibration mode In this mode resistance elements of the decade can be recalibrated Access to the calibration mode is enabled after double pushing the key MENU from the standard mode or after single pushing the same key from the SETUP mode Correct password must be entered before calibration Without correct password the access to the calibration mode is refused Default factory set calibration code is 00000 Return to standard mode is possible after pushing the key ESC Enter Recalibration procedure consists of measuring of 36 basic resistance values and entering their actually measured data Among calibration values can be moved with keys 4 In following table nominal values of calibration points and requested recalibration accuracy are described 13 Operation manual MEATEST M 622 Precision Resistance Decade terminals Roo Raw 50 zo Process of calibration consists of measuring partial resistances and writting their actual values into the decade e Set the first calibration point resistance element Use keys 4 to set the element O
15. dentification IDN Response contains name of manufacturer model type number serial number firmware version Example If query IDN lt cr gt is sent decade returns response MEATEST M622 462351 2 4 lt cr gt lt lf gt Switching off PO The command will switch the decade off The command is executed if decade is supplied from internal battery only Correct execution is confirmed with string lt cr gt lt If gt Example 0 lt gt switches decade off if not used external power adapter RO setting reading lt DNPD gt Command sets resistance value RO at temperature Set value RO is valid for all types of simulated temperature sensors lt DNPD gt It represents resistance value RO in Q Limits are shown in chapter Technical data M 622 confirms execution with string lt cr gt lt If gt In case of query M 622 returns set value in Q Example R100 lt cr gt sets value RO to 100 Q Pt100 100 After query R lt cr gt decade returns string 100 lt cr gt lt If gt 19 Operation manual MEATEST M 622 Precision Resistance Decade Temperature unit setting U lt CPD gt 0 1 Command sets used temperature unit e 0 sets degree Celsia C e sets degree Fahrenheita F M 622 confirms execution with string lt cr gt lt If gt Example U0 lt cr gt sets C as temperature unit Status reading V
16. ecade 1 Use of the instrument Resistance decade M 622 is precise programmable resistance decade in range 1 000 00 Ohm to 1 200 000 Ohm It is designed for checking of parameters of resistance meters and regulators and process meters which use external resistance sensors for non electric quantity measuring Set resistance value is created via appropriate combination of physical resistors Decade is equipped with build in function of direct simulation of most frequent temperature Pt and Ni sensors Low thermal voltage relays and stable foil resistors with low temperature coefficient are used as main parts of the decade Actual set values are displayed on the front panel display Resistance decade is supplied from internal battery External power line adapter is delivered as power line source and as internal battery charger in one M 622 is sophisticated instrument with its own re calibration procedure The procedure enables to correct any deviation in resistance without any mechanical adjusting Instrument is especially suitable for automatic testing procedures RS232 line optionally 488 bus is used for connecting decade to the computer 2 Contents of delivery RS232 version IEEE488 version Resistance decade M622 V 1xxx Resistance decade M622 V2xxx Power line adapter Power line adapter Cable RS 232 Demo program Demo program User s manual User s manual Test report Test report 3 Technical data Only values functions
17. ecking e output resistance on terminals R2W checking Procedure Use following procedure to perform parameter verification test 1 Switch both instruments on and let them for 1 hour stabilise in the laboratory with ambient temperature 23 2 C Connect resistance decade terminals R4W to the standard ohm meter multimeter Set value 4W lt 2W to 10 kOhm in SETUP menu 2 Check resistance value in points according to Table I I Maximal deviations on terminals RAW Nominal value Q Max deviation 1 00000 3 03 2 00000 3 06 5 00000 3 15 10 00000 3 3 20 0000 3 6 50 000 4 5 100 000 6 0 200 00 9 0 500 00 25 1000 0 50 2000 0 100 5000 0 750 10000 0 1500 3 Connect standard ohm meter to R2W terminals on resistance decade Use four wire connection to 10 kOhm Above this point both two wire and four wire connection can be used Set function 4W lt 2W to 0 Q in SETUP menu 4 Check resistance value in points according to Table Operation manual 16 M 622 Precision Resistance Decade MEATEST Maximal deviations on R2W terminals Nominal value Q Max deviation Q 1 00000 0 01 10 00000 0 011 100 000 0 015 1000 0 0 060 2000 0 0 1 5000 0 0 25 10000 0 0 5 20000 0 1 0 50000 2 5 100000 5 0 200000 20 500000 50 1000000 100 1200000 120 17 Operation manual MEATEST M 622 Precision Re
18. ey ESC With cursor keys 7 4 following items in setup menu can be displayed Function With buttons lt following functions be set up R resistance function Total range of resistance is 1 00000 Q to 1200000 Q Pt 68 simulation of Pt temperature sensors according to standard IEC 751 temperature scale IPTS68 coefficient 1 3850 Range of setting 200 C to 850 C 328 F to 1562 F Parameter RO resistance at 0 C can be set up in range 10 Q to 20 000 Q Pt 90 simulation of Pt temperature sensors according to standard IEC 751 temperature scale ITS90 coefficient 1 3851 Range of setting 200 C to 850 C 328 F to 1562 F Parameter RO resistance at 0 C can be set up in range 10 Q to 20 000 Q Pt US simulation of Pt temperature sensors according to standard US JIS temperature scale ITS90 coefficient 1 3851 Range of setting 200 C to 850 C 328 F to 1562 F Parameter RO resistance at 0 C can be set up in range 10 Q to 20 000 Q Ni simulation of Ni temperature sensors according to standard DIN 43760 coefficient 6180 Range of setting 60 C to 300 C 76 F az 572 F Parameter RO resistance at 0 C can be set up in range 10 Q to 20 000 Q User by user defined temperature function As default NTC thermistor sensor with temperaure function R T 330 exp 4050 1 298 15 1 07 273 15 is delivered Range of simulation is 30 C to 110 C This function can be ch
19. ion Resistance Decade MEATEST 5 2 Rear panel ws Power line adapter a IEEE488 s Power line adapter On the rear panel there are located power supply connector interface RS 232 connector optionally IEEE488 connector and serial number plate 6 Operation 6 1 Switch on and off When supplied from power line adapter decade is automatically switched on all this time the adapter is connected to the power source When supplied from internal battery power line adapter is not connected to the power line connector or adapter is not connected to the power source decade must be switched on by pushing the key POWER To switch off the decade push the same key two times When supplied from internal battery decade is automatically switch off if for last 20 minutes no one key was pushed or if internal battery is discharged One minute before automatic switching off decade displays symbol beeps to warn the user 9 Operation manual MEATEST M 622 Precision Resistance Decade 6 2 Standard mode After switching on decade comes to standard mode Following information is shown on the display 108 C 1 85 In the upper row actually simulated temperature C generated resistance Q is displayed In the lower row type of simulated temperature sensor Pt100 set up temperature scale IPTS68 ITS90 according to the IEC751 standard or US according to the US JIS standards
20. istance accuracy terminals R2W 1 00000 Q 400 000 Q 0 003 95 MQ 1 00000 Q 2000 0 Q 0 005 10 mQ 400 01 2000 0 2 0 005 2000 1 200 000 0 005 2000 1 Q 10000 00 0 015 200 001 1200 000 0 01 Maximal thermoelectric voltage on terminals R4W is 1 pV Maximal thermoelectric voltage on terminals R2W in resistance range 1 Q to 2 is 5 uV and in range 2 to 1 2 15 15 pV Pt temperature sensor simulation accuracy Temperature range Pt100 Pt200 Pt500 Pt1000 Pt10000 terminals terminals terminals terminals terminals R4W R4W R4W R4W R2W 200 000 200 000 C 0 02 C 0 02 C 0 02 C 0 04 C 0 04 C 200 001 500 000 C 0 03 0 04 C 0 06 C 0 06 C 500 001 850 000 0 04 0 06 C 0 15 Ni temperature sensor simulation accuracy Temperature range Ni100 Ni1000 Ni10000 terminals terminals terminals R4W R4W R2W 60 000 300 000 0 02 C 0 04 C 0 04 C Temperature coefficient outside of the reference temperature range is 10 of the stated specification per C Short and Open simulation version M622 Vx1xx only When function Short is selected output resistance is lower than 100 mQ typically 50 mQ Maximal allowed current is 500 mA When function Open is selected output resistance is higher than 1 GQ Maximal allowed voltages are 50 V ef on terminals R4W and 120 V DC 50 Vef AC on terminals R2W Note Resist
21. lue can be written after changing keyboard meaning to numerical by pushing ENTER Allowed range is from 10 to 10 000 Q To confirm new value press ENTER New value is valid even if the instrument is switched off and on again 11 Operation manual MEATEST M 622 Precision Resistance Decade T unit temperature unit With buttons lt either C or F can be set up here Possibilities are shown in lower row After selecting one of them and pressing the button ENTER appropriate symbol is written to upper row New value is valid even if the instrument is switched off and on again Baud rate RS 232 optionally IEEE488 address In standard version the function involves to set parameter baud rate of RS 232 interface With keys lt any value from the row 300 600 1200 2400 4800 9600 or 19200 Bd can be set Set baud rate is displayed in lower row To change currently valid value to the new value press the key ENTER The newly set baud rate is written into the upper row If the decade is optionally equipped with IEEE488 instead of Baud rate you can set IEEE488 address of instruments In decade with IEEE488 interface IEEE488 address can be set up here The address range is 0 to 30 The last set baud rate is valid even if the instrument is switched off Lighting Enables or disables lighting of the display With keys lt values OFF lighting is switched off 30 s lighting is switched on for 30 s after last key pre
22. peration manual 14 M 622 Precision Resistance Decade MEATEST e Measure resistance of the selected element Use ohm meter with appropriate accuracy in 4 wire connection and with appropriate accuracy e Change function of the keyboard to the numerical one by pushing the key ENTER e Write measured resistance value there is original value in the first row and newly entered value in the second row Newly entered value must to be written down in units Ohm REG 62 488888 it 0280 e Confirm new calibration data by pushing the key ENTER e Repeat above described procedure for all resistance elements Recommended connection of standard ohm meter for calibration points ROO to R26 terminals R4W Digital Ohmmeter M 622 Precision Resistance Decade na 22 Precision Resistance Decade 15 Operation manual MEATEST M 622 Precision Resistance Decade 7 Performance verification test Parameter verification procedure is described in the chapter Verification procedure is based on measuring resistance on the decade output terminals with standard multimeter in recommended points Required equippment e Ohm meter nominal accuracy 0 001 in range 1 to 1 2 MQ type Wavetek 1281 or similar Decade setting Switch decade to the resistance function Connect standard multimeter to the decade output terminals Use four wire connection technique Range of the test e output resistance on terminals ch
23. ranges with signed accuracy in relative or absolute expression or where limits are specified are guaranteed Resistance range 1 000 00 1 200 000 Q SHORT OPEN terminals version M622 Vx1xx only Pt sensor temperature simulation 200 000 C 850 000 C 328 F 1562 F Ni sensor temperature simulation 60 000 C 300 000 C 76 F 572 F Type of temperature sensors Pt10 Pt20000 Nil0 Ni20000 Resolution 0 000 01 Q for 1 000 00 10 000 00 Q 0 000 1 Q for 10 0001 100 000 0 Q 0 001 Q for 100 001 400 000 Q 0 01 Q for 400 01 1 200 00 Q 0 1 Q for 1200 1 30 000 0 Q 1 Q for 30000 1 200 000 Q 0 001 C for Pt10 Pt300 Ni10 Ni300 Operation manual 4 M 622 Precision Resistance Decade MEATEST Pt temperature standards Ni temperature standards Resistance temperature coefficient Maximal dissipation power Maximal voltage Connection of output terminals Connection of temperature sensors Reaction time Terminals Interface Power supply Operating period from battery Reference temperature Working temperature Storing temperature Housing Dimensions table version Dimensions 19 module Weight Isolation resistance between output terminals and housing 0 01 C for Pt301 Pt10000 Ni301 3110000 IEC 751 1 3850 for IPTS68 IEC 751 1 3851 for ITS90 US US JIS 1 3916 DIN 43760 6180 lt 1 ppm C 1 Q 2000 Q
24. sistance Decade 8 Remote control Standard version is equipped with RS232 bus IEEE488 version is described in chapter 8 4 Commands for both versions are the same 8 1 Commands Communication between decade and computer consists of flow of periodically alternating commands type command response or query response Command is always a letter followed by parameter and ended by control sign lt cr gt or lt lf gt Response is always ended with control signs lt cr gt lt Syntax description lt DNPD gt Decimal Numeric Program Data this format is used to express decimal number with or without the exponent lt CPD gt Character Program Data Usually it represents a group of alternative character parameters E g 0111213 A flag indicating a request for the value of the parameter specified by the command No other parameter than the question mark can be used A flag indicating a request for the parameter specified by the command This command permits a value to be set as well as requested lt cr gt carriage return ASCII code 13 This code executes the program line lt lf gt line feed ASCII code 10 This code executes the program line 8 2 Command list Value setting reading A lt DNPD gt The command sets resistance value resistance function or temperature value temperature sensor simulating function lt DNPD gt It represents resistance value in Ohm or simulated temperature in oC When
25. ssing 5m lighting is switched on for 5 minutes after last key pressing or ON lighting is switched on can be set Selected parameter is displayed in lower row To change currently selected parameter press the key ENTER The newly set parameter is written into the upper row If the instrument is supplied from the external power adapter lighting is switched on permanently Note Display lighting influences significantly operating period from the internal battery If not used when instrument is supplied from internal battery the working period can be lengthen about 50 Calibration mode password setting Calibration password is a five digit number which must be entered to access the calibration mode If the password is set to 00000 this information is displayed in the Setup menu otherwise only symbols are shown Password can be changed New password can be entered directly from keyboard after changing keyboard meaning to numerical by pushing ENTER If previous password was 00000 simply type new 5 digit code and press ENTER New password is saved and cannot be read in MENU If previous password was non zero new password can be entered in two steps In the first step original password must be entered and confirmed by pressing ENTER If it is correct symbols 00000 are displayed Now new password can be entered and saved according to above described procedure New password is valid even if the instrument is switche
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