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Calibration Programs

B-1

B.1

Introduction

This appendix includes programs written in BASIC and Tur-
bo C to aid you in calibrating the Model 2002. Refer to Sec-
tion 2 for more details on calibration procedures.

B.2

Computer hardware requirements

The following computer hardware is required to run the ex-
ample calibration programs:

• IBM PC, AT, or compatible computer.

• Keithley KPC-488.2, KPS-488.2, or KPC-488.2AT, or

CEC PC-488 IEEE-488 interface for the computer.

• Two shielded IEEE-488 connecting cables (Keithley

Model 7007).

B.3

BASIC program requirements

In order to use the BASIC programs, you will need the fol-
lowing software:

• Microsoft QBasic (supplied with MS-DOS 5.0 or later).

QuickBASIC (version 4.5 or later) or Visual BASIC for
MS-DOS may also be used.

• MS-DOS version 5.0 or later (version 3.3 or later may

be used if not using QBasic).

• HP-style Universal Language Driver, CECHP.EXE

(supplied with Keithley and CEC interface cards listed
above).

B.4

Turbo C program requirements

In order to use the Turbo C programs, you will need the fol-
lowing software:

• MS-DOS or PC-DOS version 3.3 or later.

• Borland Turbo C version 2.0 or later. (Other ANSI-

compatible C compilers can also be used, but some pro-
gram modifications may be necessary.)

• HP-style Universal Language Driver, CECHP.EXE

(supplied with the Keithley and CEC interface cards
listed above).

B.5

Calibration equipment

Table B-1 summarizes recommended comprehensive cali-
bration equipment, and Table B-2 summarizes test equip-
ment required for low-level calibration.

Содержание Keithley 2002

Страница 1: ...Calibration Manual 2002 905 01 Rev E September 2022 P2002B 905 01E 2002 905 01E tek com keithley Model 2002 8 5 Digit Multimeter...

Страница 2: ...ole or in part without the prior written approval of Keithley Instruments LLC is strictly prohibited These are the original instructions in English All Keithley Instruments product names are trademark...

Страница 3: ...d to mains These instruments will be marked as category II or higher Unless explicitly allowed in the specifications operating manual and instrument labels do not connect any instrument to mains Exerc...

Страница 4: ...lains hazards that could damage the instrument Such damage may invalidate the warranty The CAUTION heading with the symbol in the user documentation explains hazards that could result in moderate or m...

Страница 5: ...ion 1 15 1 8 7 Temperature reading checks 1 17 2 Calibration 2 1 Introduction 2 1 2 2 Environmental conditions 2 2 2 3 Warm up period 2 2 2 4 Line power 2 2 2 5 Calibration lock 2 2 2 5 1 Comprehensiv...

Страница 6: ...ommand summary 3 1 3 3 CALibration PROTected Subsystem 3 3 3 3 1 INIT 3 3 3 3 2 LOCK 3 3 3 3 3 SWITch 3 4 3 3 4 SAVE 3 4 3 3 5 DATA 3 4 3 3 6 DATE 3 5 3 3 7 NDUE 3 5 3 3 8 DC 3 6 3 3 9 LLEVel 3 11 3 4...

Страница 7: ...nges 1 14 Figure 1 8 1G resistor test box construction 1 15 Figure 1 9 Connections for frequency accuracy verification 1 16 2 Calibration Figure 2 1 Low thermal short connections 2 5 Figure 2 2 Calibr...

Страница 8: ...calibration command summary 2 3 Table 2 2 Recommended equipment for comprehensive calibration 2 4 Table 2 3 Front panel comprehensive calibration summary 2 5 Table 2 4 IEEE 488 bus comprehensive calib...

Страница 9: ...ded equipment Summarizes recom mended equipment and pertinent specifications 1 6 Verification limits Explains how reading limits were calculated 1 7 Restoring factory default conditions Gives step by...

Страница 10: ...ng a 19V input val ue and the various specifications are as follows Model 2002 relative accuracy 10ppm of reading 0 15ppm of range Model 2002 factory calibration uncertainty 2 6ppm of reading Calibrat...

Страница 11: ...190k 13ppm 1 9M 19ppm 19M 47ppm 100M 120ppm Fluke 5725A Amplifier AC Voltage 1kHz 10kHz 750V 85ppm Fluke 5700A 03 Wideband AC option 190mV 0 22 1 9V 0 3 2MHz Fluke 5440A 7002 Low thermal cable set Kei...

Страница 12: ...curate DC voltages from a calibrator to the Model 2002 input and veri fying that the displayed readings fall within specified ranges Follow the steps below to verify DCV measurement accuracy CAUTION D...

Страница 13: ...1 2 Table 1 2 Limits for DCV verification 2002 DCV Range Applied DC Voltage Reading Limits 1 year 18 to 28 C 200mV 190 000000mV 189 991911mV to 190 008089mV 2V 1 90000000V 1 89996058 to 1 90003942V 2...

Страница 14: ...re Model 2002 factory default conditions as ex plained in paragraph 1 7 4 Select the ACV function and the 200mV range on the Model 2002 and make sure that REL is disabled NOTE Do not use REL to null o...

Страница 15: ...mplifier Connect to calibrator Input HI Output HI Input LO Output LO CA 18 1 Low capacitance cable Model 2002 1 90000 VAC RMS Figure 1 3 Connections for 2MHz AC volts verification 2002 MULTIMETER BNC...

Страница 16: ...V 1 80100V to 1 99900V 20V 19 0000V 18 9885V to 19 0116V 18 9913V to 19 0087V 18 9894V to 19 0106V 18 9875V to 19 0125V 18 9837V to 19 0163V 18 9400V to 19 0600V 18 8525V to 19 1475V 18 2000V to 19 80...

Страница 17: ...e calibrator output to 190 000mVAC at a fre quency of 10Hz and allow the reading to settle 7 Verify that the Model 2002 reading is within the limits summarized in Table 1 4 8 Repeat steps 6 and 7 for...

Страница 18: ...n the limits summarized in Table 1 5 8 Repeat steps 6 and 7 for 100mVAC at the remaining fre quencies listed in the table 9 Repeat steps 6 through 8 for the 2V 20V 200V and 750VAC ranges using the inp...

Страница 19: ...ssary to return to normal display 5 Select the DC current function DCI and the 200 A range on the Model 2002 If the FILT annunciator is off press the FILTER key to enable the filter 6 Set the calibrat...

Страница 20: ...d before making measure ments Be sure the calibrator is set for normal current output 3 Restore Model 2002 factory default conditions as explained in paragraph 1 7 4 Select the AC current function and...

Страница 21: ...344V 1 89742V to 1 90258V 1 89742V to 1 90258V 20mA 19 0000mA 18 8355V to 19 1645V 18 9657V to 19 0344V 18 9742V to 19 0258V 18 9742V to 19 0258V 200mA 190 000mA 188 355V to 191 645V 189 657V to 190 3...

Страница 22: ...ngs then press ENTER G Press EXIT to return to normal display 4 Select the Model 2002 2 function and change to the 20M range If the FILT annunciator is off press the FILTER key to enable the filter 5...

Страница 23: ...s and allow a one hour warm up period before measurement Table 1 9 Limits for resistance verification 1G range Characterized resistor R Reading limits 1 year 18 C to 28 C _________ G _________ G to __...

Страница 24: ...the first line of Table 1 10 8 Set the synthesizer to each of the frequencies listed in Table 1 10 and verify that the Model 2002 frequency reading is within the required limits Table 1 10 Frequency v...

Страница 25: ...to further information below on how to check thermocouple and RTD probe readings Thermocouple temperature reading checks To check thermocouple readings simply apply the appropri ate DC voltage listed...

Страница 26: ...12 RTD probe temperature reading checks RTD probe type Applied resistance Reading limits C 1 year 18 C to 28 C PT385 0 00385 22 80 60 25 100 109 73 138 50 313 59 190 068 to 189 932 100 021 to 99 979 0...

Страница 27: ...conditions States the temperature and humidity limits for calibration 2 3 Warm up period Discusses the length of time the Model 2002 should be allowed to warm up before calibration 2 4 Line power Stat...

Страница 28: ...pressing in on the recessed CAL switch The instrument will display the fol lowing message CALIBRATION UNLOCKED Calibration can now be performed If you attempt comprehensive or low level calibration wi...

Страница 29: ...al date from 2002 Comprehensive calibration subsystem Short circuit calibration step 2V DC calibration step 20V DC calibration step 1M calibration step 200k calibration step 20k calibration step 2k ca...

Страница 30: ...prehensive calibration should be performed at least once a year or every 90 days to ensure the unit meets the cor responding specifications The comprehensive calibration procedure covered in this para...

Страница 31: ...ator Ohms calibrator Ohms calibrator Ohms calibrator Ohms calibrator Ohms calibrator Ohms calibrator DCA calibrator DCA calibrator DCA calibrator DCA calibrator DCA calibrator Disconnect leads Disconn...

Страница 32: ...of comprehensive calibration Input HI Output HI Input LO Output LO Model 2002 5700A Calibrator Note Use shielded cables to minimize noise Enable or disable calibrator external sense as indicated in pr...

Страница 33: ...esistance val ue displayed by the calibrator The allowable range for this parameter is from 95k to 205k 10 Press ENTER to complete the 200k calibration step 11 Repeat steps 7 through 10 for the 20k 2k...

Страница 34: ...002 5700A Calibrator Amps Note Be sure calibrator is set for normal current output Step 9 Enter calibration dates 1 Press ENTER and note that the instrument prompts you to enter the present calibratio...

Страница 35: ...ion 20VDC calibration 1M calibration 200k calibration 20k calibration 2k calibration 200 calibration 20 calibration 200 A calibration 2mA calibration 20mA calibration 200mA calibration 2A calibration...

Страница 36: ...Send the following command over the bus CAL PROT DC ZERO 3 Wait until the Model 2002 finishes this calibration step before proceeding You can use the OPC or OPC commands to determine when calibration...

Страница 37: ...INPUT LO jacks as shown in Figure 2 3 2 Set the calibrator output to 200 000 A and place the unit in operate 3 Send the following command to the Model 2002 CAL PROT DC A200U 200E 6 If you are using a...

Страница 38: ...0mA 1 00000A 95 A to 205 A 0 95mA to 2 05mA 9 5mA to 20 5mA 95mA to 205mA 0 95A to 2 05A CAL PROT DC A200U 200E 6 CAL PROT DC A2M 2E 3 CAL PROT DC A20M 20E 3 CAL PROT DC A200M 200E 3 CAL PROT DC A2 1...

Страница 39: ...ally required in the field The following paragraphs give detailed procedures for performing low level calibration should it ever become necessary in the field NOTE Low level calibration is required in...

Страница 40: ...11ppm 100k 13ppm 1M 18ppm DC Current 200 A 100ppm 2mA 55ppm 20mA 55ppm 200mA 65ppm 1A 110ppm AC Voltage 0 5mV 1kHz 10000ppm 5mV 100kHz 2400ppm 200mV 1kHz 150ppm 1 5V 1kHz 80ppm 20V 1kHz 80ppm 20V 30kH...

Страница 41: ...STEP 5 CAL PROT LLEV STEP 6 CAL PROT LLEV STEP 7 CAL PROT LLEV STEP 8 CAL PROT LLEV STEP 9 CAL PROT LLEV STEP 10 CAL PROT LLEV STEP 11 CAL PROT LLEV STEP 12 CAL PROT LLEV STEP 13 CAL PROT DATE yr mon...

Страница 42: ...ess the follow ing will be displayed Performing Short Ckt Calibration Step 3 DC volts calibration 1 When the DC zero calibration step is completed the fol lowing message will be displayed CONNECT 2 VD...

Страница 43: ...rsor and range keys set the resistance value displayed by the Model 2002 to the exact resistance val ue displayed by the calibrator The allowable range for this parameter is from 95k to 205k 10 Press...

Страница 44: ...L PHASE NOTE Use the exact calibration values shown when performing the following steps 2 Connect the calibrator to the INPUT terminals as shown in Figure 2 4 3 Press ENTER The instrument will display...

Страница 45: ...R key The Model 2002 will advise you that the current step is in progress Low Level Cal Step 9 of 13 21 After this step has been completed the unit will display the following Connect 20 VDC NOTE The a...

Страница 46: ...onnections 2002 MULTIMETER Model 2002 BNC to Dual Banana Plug Adapter 50 BNC Coaxial Cable Model 3930A or 3940 Synthesizer Function Output 3930A MULTIFUNCTION SYNTHESIZER 3 Press EXIT as necessary to...

Страница 47: ...3 Send the following command to the Model 2002 over the IEEE 488 bus CAL PROT DC V2 2 Be sure to use the exact calibration value as the command parameter if you are using a voltage other than 2V The...

Страница 48: ...CAL PROT DC OHM200K 100E3 CAL PROT DC OHM20K 19E3 CAL PROT DC OHM2K 1 9E3 CAL PROT DC OHM200 190 CAL PROT DC OHM20 19 Nominal resistance values shown Use exact calibrator resistance value for command...

Страница 49: ...2002 CAL PROT LLEV STEP 8 10 Set the calibrator output to 100V DC Send the follow ing command to the Model 2002 CAL PROT LLEV STEP 9 NOTE The accuracy of the 100V calibration source is especially cri...

Страница 50: ...e turning on the power the LL CAL low level calibration selection will also appear in the POINT CALS menu You can then calibrate a specific low level point see paragraph 2 10 for details Example Assum...

Страница 51: ...k calibration 3 Send the following command over the bus to initiate calibration CAL PROT INIT 4 Connect the 2k or closest available value calibration source to the front panel INPUT and SENSE jacks us...

Страница 52: ...Calibration 2 26...

Страница 53: ...level calibration 3 3 CALibration PROTected Subsystem Gives detailed explanations of the various commands used for both comprehensive and low level calibration 3 4 CALibration UNPRotected Subsystem D...

Страница 54: ...ehensive calibration subsystem Low thermal short calibration step 2V DC calibration step 20V DC calibration step 1M calibration step 200k calibration step 20k calibration step 2k calibration step 200...

Страница 55: ...any other comprehen sive or low level calibration command Programming Note The INIT command should be sent only once before performing either complete or single point calibration Do not send INIT befo...

Страница 56: ...alibration constants derived during both comprehensive and low level calibration in EEROM EEROM is non volatile memory and cal ibration constants will be retained indefinitely once saved Generally SAV...

Страница 57: ...be delimited by commas Examples CAL PROT DATE 1994 12 16 Send cal date 12 16 94 CAL PROT DATE Request date 3 3 7 NDUE CALibration PROTected NDUE Purpose To send the next calibration due date to the i...

Страница 58: ...3 2 Comprehensive calibration commands Command Description Parameter limits CALibration PROTected DC ZERO V2 NRf V20 NRf OHM1M NRf OHM200K NRf OHM20K NRf OHM2K NRf OHM200 NRf OHM20 NRf A200U NRf A2M N...

Страница 59: ...t dc v20 Cal_voltage Parameter Cal_voltage 9 5 to 20 5 V Description V2 programs the 20V DC comprehensive calibration step The allowable range of the calibra tion voltage parameter is from 9 5 to 20 5...

Страница 60: ...20 5E3 Description OHM20K programs the 20k comprehensive calibration step The allowable range of the cal ibration resistance parameter is from 9 5k to 20 5k Use the 20k value whenever possible or the...

Страница 61: ...ormat cal prot dc ohm20 Cal_resistance Parameter Cal_resistance 9 5 to 20 5 Description OHM20 programs the 20 comprehensive calibration step The allowable range of the calibration resistance parameter...

Страница 62: ...al prot dc a20m Cal_current Parameter Cal_current 9 5E 3 to 20 5E 3 A Description A200U programs the 20mA comprehensive calibration step The allowable range of the cali bration current parameter is fr...

Страница 63: ...2 1 Program 2A step 3 3 9 LLEVel CALibration PROTected LLEVel Low level calibration commands are summarized in Table 3 3 Table 3 3 Low level calibration commands Command Description CALibration PROTec...

Страница 64: ...le turning on instrument power CAL PROT LLEV SWIT Request low level CAL switch status STEP CALibration PROTected LLEVel STEP Purpose To program individual low level calibration steps Format cal prot l...

Страница 65: ...y calibration step the Model 2002 will generate an error message Several methods to detect calibration errors are discussed in the following paragraphs The cal ibration programs listed in Appendix B m...

Страница 66: ...the OPC operation com plete 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 whe...

Страница 67: ...Specifications A 1 A Specifications For the latest specifications refer to tek com keithley...

Страница 68: ...th MS DOS 5 0 or later QuickBASIC version 4 5 or later or Visual BASIC for MS DOS may also be used MS DOS version 5 0 or later version 3 3 or later may be used if not using QBasic HP style Universal L...

Страница 69: ...able B 2 Recommended equipment for low level calibration Mfg Model Description Specifications Fluke 5700A Calibrator 5ppm basic uncertainty DC Voltage 2V 7ppm 20V 5ppm 100V 7ppm Resistance 19 26ppm 19...

Страница 70: ...errors then save the program using a convenient filename 7 Compile and or run the program and follow the prompts on the screen to perform calibration B 7 Unlocking calibration In order to unlock comp...

Страница 71: ...nable or disable calibrator external sense as indicated in procedure Sense HI Sense LO Sense LO Sense HI Figure B 3 Calibrator voltage connections 2002 MULTIMETER Input HI Output HI Input LO Output LO...

Страница 72: ...ader CLS Clear CRT PRINT Model 2002 Multimeter Comprehensive Calibration Program PRINT This program controls the Fluke 5700A Calibrator GOSUB CheckSwitch GOSUB KeyCheck PRINT 1 OUTPUT 16 CAL PROT INIT...

Страница 73: ...OUTPUT 16 SYST PRES Restore bench defaults PRINT Calibration completed END KeyCheck Check for key press routine WHILE INKEY WEND Flush keyboard buffer PRINT PRINT Press any key to continue ESC to abo...

Страница 74: ...st DATA Connect low thermal short to inputs wait 3 minutes DC ZERO DATA OUT 2 V DC V2 2 DATA OUT 20 V DC V20 20 DATA OUT 1 MOHM DC OHM1M DATA OUT 100 KOHM DC OHM200K DATA OUT 19 KOHM DC OHM20K DATA OU...

Страница 75: ...d keypress errcheck chkswit settle endpgm char buf 100 date 10 int i j calend if ieeein fopen IEEE r NULL Open input file printf Cannot open IEEE 488 bus I O n exit 1 ieeeout fopen IEEE w Open output...

Страница 76: ...utput 4 s n msg i break case 14 fprintf ieeeout output 4 stby n printf s n msg i keypress break case 15 printf s n msg i break if i 0 i 14 1 15 settle if i 2 i 9 fprintf ieeeout output 16 s s opc n cm...

Страница 77: ...6 n fgets errbuf 100 ieeein if atoi errbuf 0 printf n s n errbuf void chkswit Check cal switch int swit 0 while swit 0 fprintf ieeeout output 16 cal prot swit n fprintf ieeeout enter 16 n fscanf ieeei...

Страница 78: ...B CheckSwitch GOSUB KeyCheck RESTORE CmdList PRINT 1 OUTPUT 16 CAL PROT INIT Initiate calibration FOR I 1 TO 29 Loop for all cal points READ Msg Cmd Read message cal strings IF I 17 THEN C CAL PROT SE...

Страница 79: ...GOTO EndProg Abort if ESC is pressed RETURN CalEnd Check for cal step completion PRINT Performing calibration step I DO PRINT 1 SRQ Request SRQ status INPUT 2 S Input SRQ status byte LOOP UNTIL S Loo...

Страница 80: ...OUT 1A DC A2 1 DATA Disconnect calibrator from INPUT and SENSE jacks DC OPEN DATA Performing AC calibration please wait UNPR ACC DATA OUT 20 V 1 KHZ LLEV STEP 1 DATA OUT 20 V 30 KHZ LLEV STEP 2 DATA O...

Страница 81: ...k cal prot dc ohm200 cal prot dc ohm20 cal prot dc a200u 200e 6 cal prot dc a2m 2e 3 cal prot dc a20m 20e 3 cal prot dc a200m 200e 3 cal prot dc a2 1 cal prot dc open cal unpr acc cal prot llev step 1...

Страница 82: ...13 case 17 case 18 case 19 case 20 case 21 case 22 case 23 case 24 case 25 fprintf ieeeout output 4 s n msg i fprintf ieeeout output 4 oper n break case 3 case 4 case 5 case 6 case 7 case 8 fprintf i...

Страница 83: ...lose ieeeout void keypress Wait for keypress printf nPress any key to continue ESC to abort n while kbhit 0 if getch 27 endpgm int calend n Check for cal end int n int stat printf Performing calibrati...

Страница 84: ...brator settle int stat do fprintf ieeeout output 4 isr n fprintf ieeeout enter 4 n fscanf ieeein d stat while stat 0x1000 void endpgm End program fprintf ieeeout output 4 stby n printf Calibration abo...

Страница 85: ...Calibration Programs B 18...

Страница 86: ...d is sent at the end of the calibration procedure If the in ternal temperature drift is excessive the ERR annunciator will turn on and the Excessive temp drift during cal mes sage will be placed in th...

Страница 87: ...398 399 2k ohm fs oc out of spec 200 ohm fs out of spec 200 ohm fs oc out of spec 20 ohm fs out of spec 20 ohm fs oc out of spec 200ua full scale out of spec 2ma full scale out of spec 20ma full scal...

Страница 88: ...fer data lost GPIB address lost Power on state lost AC calibration data lost DC calibration data lost Calibration dates lost Installed option id lost Preamp calibration data lost Low level calibration...

Страница 89: ...AC ranges Average offset for 200mV and 20V AC ranges 100 1 divider attenuation factor 500 1 divider attenuation factor Positive peak offset for 200mV AC range Negative peak offset for 200mV AC range P...

Страница 90: ...e 7V reference 20V full scale 20V full scale divider x5 20V full scale divider x50 Hi ohms resistance 1M full scale 200k full scale 20k full scale 20k full scale OC on 20k full scale OC off 2k full sc...

Страница 91: ...ue x10 average noise factor DC attenuator correction Negative full scale rollover value Rear 20V zero Rear 2V zero Rear 200mV zero Rear 1M 4 wire zero Rear 1M 2 wire zero Rear 200k 4 wire zero Rear 20...

Страница 92: ...site of enabling cal with CAL switch Request comprehensive CAL switch state 0 locked 1 unlocked Save cal constants to EEROM Download cal constants from 2002 Send cal date to 2002 Request cal date from...

Страница 93: ...AC at 1kHz step 200mV AC at 1kHz step 5mV AC at 100kHz step 0 5mV AC at 1kHz step 100V DC step 20V DC step Rear inputs short circuit step 20mA AC at 1kHz step 2V AC at 1Hz step Commands in this subsy...

Страница 94: ...itions 1 1 2 2 Error generation C 1 Error summary C 1 Error queue 3 13 F Frequency accuracy verification 1 15 Front panel AC calibration 2 12 Front panel comprehensive calibration 2 4 Front panel erro...

Страница 95: ...able Bit 3 13 T Temperature drift error C 1 Temperature reading checks 1 17 Thermocouple temperature reading checks 1 17 Turbo C program requirements B 1 U Unlocking calibration B 3 Using the OPC comm...

Страница 96: ...ithley trademarks and trade names are the property of Keithley Instruments All other trademarks and trade names are the property of their respective companies Keithley Instruments 28775 Aurora Road Cl...

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