Keithley 2500 Service Manual Download Page 88

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Model 2500 Service Manual

Replaceable Parts

6-7

U120

PROGRAMMED ROM

2500-800*

U121

PROGRAMMED ROM

2500-801*

U150

64K BIT SERIAL FRAM

IC-1381

U154,U161

IC, 2 INPUT NAND GATE, NC7S00

IC-1181

U155

IC, OCT BFR/LINE DRIVE, 74HCT244

IC-651

U159,U165

IC, POS NAND GATES/INVERT,

74HCT14

IC-656

U160,U162

IC, 256K X 16 BIT CMOS RAM 17NS

LSI-249-1

U163

IC, 32-BIT MICROCONTROLLER

20MHZ

LSI-203-20

U164

IC, PROTECTED QUAD POWER

DRIVERS

IC-1212

U166

IC, +5V RS-232 TRANSCEIVER,

MAX202

IC-952

U167

IC, GPIB ADAPTER, 9914A

LSI-123

U169

IC, OCTAL INTER BUS TRANS, 75161

IC-647

U170

IC, OCTAL INTERFACE BUS, 75160

IC-646

U171

IC, 2-INPUT OR GATE

IC-1206

U301,U501

IC, +5V VOLTAGE REGULATOR,

LM2940CT

IC-576

U302,U502

IC, POS VOLTAGE REG +15V, 60MA,

LM2940CT-15

IC-1186

U303,U503

IC, NEG VOLTAGE REG -15V, 50MA,

LM2990T-15

IC-1187

U304,U305,U504,U505

IC, OPTOCOUPLER, 2611

IC-690

U308,U508

IC, CMOS ANALOG SWITCH

IC-1395

U309,U509

IC, +5V 16 BIT DAC, MAX542ACSD

IC-1176

U310,U510

IC, VOLTAGE REFERENCE

IC-1065

U312,U512

IC, DIFFERENTIAL AMP, INA117P

IC-889

U313,U513

IC, DUAL OP-AMP, LF353M

IC-842

U314,U514

IC, OP AMP, LOW POWER AD795JR

IC-1052

U315,U316,U515,U516

IC, 8 STAGE SHIFT C074HC409AM

IC-1026

U317,U517

IC, 8-CHAN ANA MULTIPLEXER,

DG408DY

IC-844

U318,U518

IC, OP-AMP, LOW NOISE LT1007CS8

IC-949

U319,U519

IC, QUAD D FLIP FLOP W/CLK, RESET

74HC175

IC-923

U320,U321,U520,U521

IC, QUAD 2 IN NOR, 74HCT02

IC-809

U322,U522

IC, NCHAN LAT DMOS QUADFET,

SD5400CY

IC-893

U323,U523,U311,U511

IC, OPA177GS

IC-960

Table 6-1 (cont.)

Mother board parts list

Circuit designation

Description

Keithley
part no.

Summary of Contents for 2500

Page 1: ...c i a n sw i t ho v e r 1 5 0y e a r so f s p e c i a l i z a t i o n 9 0d a yw a r r a n t y 5d a yr i g h t o f r e t u r no na l l e q u i p me n t 1 3y e a r w a r r a n t i e sf o r n e wa n d p...

Page 2: ...Contains Calibrating and Servicing Information Model 2500 Dual Photodiode Meter Service Manual...

Page 3: ...OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN AD...

Page 5: ...d incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created all Addenda associated with the previous Revision of the manual are incorporated into the new...

Page 6: ...Standards Institute ANSI states that a shock haz ard 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 pres...

Page 7: ...g in a manual 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 a ma...

Page 8: ...e humidity 2 2 Warm up period 2 2 Line power 2 2 Calibration considerations 2 3 Calibration cycle 2 3 Recommended calibration equipment 2 3 Calibration menu 2 4 Unlocking calibration 2 5 Unlocking cal...

Page 9: ...wer supply 4 8 Digital circuitry 4 9 Troubleshooting 4 10 Display board checks 4 10 Power supply checks 4 11 Digital circuitry checks 4 12 Analog circuitry checks 4 13 No comm link error 4 14 5 Disass...

Page 10: ...ds B 6 Voltage bias commands B 7 Detecting calibration errors B 8 Reading the error queue B 8 Error summary B 8 Status byte EAV Error Available bit B 9 Generating an SRQ on error B 9 Detecting calibra...

Page 11: ......

Page 12: ...ication tests 1 12 2 Calibration Figure 2 1 Channel 1 voltage calibration connections 2 11 Figure 2 2 Channel 2 voltage calibration connections 2 13 Figure 2 3 Channel 1 current calibration connection...

Page 13: ......

Page 14: ...age bias calibration summary 2 23 Table 2 9 Channel 2 remote voltage bias calibration summary 2 24 Table 2 10 Channel 1 calibration currents and commands 2 25 Table 2 11 Channel 2 calibration currents...

Page 15: ......

Page 16: ...1 PerformanceVerification...

Page 17: ...to do so Some of these procedures may expose you to hazardous voltages which could cause personal injury or death if contacted Use standard safety precautions when working with hazardous voltages NOTE...

Page 18: ...one extra hour to stabilize a unit that is 50 F 10 C outside the specified temperature range Allow the test equipment to warm up for the minimum time specified by the manufacturer Line power The Model...

Page 19: ...ation limits The verification limits listed in this section have been calculated using only the Model 2500 one year accuracy specifications and they do not include test equipment uncertainty If a part...

Page 20: ...2 A Limits 1 9mA 3 9 A Limits 1 8961mA to 1 9039mA Restoring factory defaults Before performing the verification procedures restore the instrument to its factory front panel BENCH defaults as follows...

Page 21: ...a scanner multiplexer or other switching equipment WARNING The maximum common mode voltage voltage between LO and chassis ground is 200V DC Exceeding this value may cause a shock hazard CAUTION Maxim...

Page 22: ...OUTPUT 200V PEAK 50 60Hz AC ONLY 25 VA MAX AMPS COUL 350V PEAK 200V PEAK 100mA PEAK LINE FUSE SLOWBLOW 1 4A 90 125V 1 8A 180 250V LINE VOLTAGE 90 110V 180 220V 105 125V 210 250V WARNING NO INTERNAL O...

Page 23: ...procedure for channel 2 Connect the calibrator to the INPUT CHANNEL 2 jack and select channel 2 by pressing MSR2 See Figure 1 2 for connections Table 1 2 Current measurement verification limits Model...

Page 24: ...25V 1 8A 180 250V LINE VOLTAGE 90 110V 180 220V 105 125V 210 250V WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD...

Page 25: ...d DMM and allow them to warm up for at least one hour 3 Restore BENCH defaults as covered in Restoring factory defaults 4 Select the multimeter DC volts measuring function and choose auto range 5 Pres...

Page 26: ...LACE FUSE WITH SAME TYPE AND RATING 120 LINE RATING 50 60Hz 60 VA MAX FUSE LINE 630 mAT SB 315 mAT SB 100 VAC 120 VAC 220 VAC 240 VAC CAT I MADE IN U S A DIGITAL I O RS 232 TRIGGER LINK INPUT CHANNEL...

Page 27: ...INST FIRE HAZARD REPLACE FUSE WITH SAME TYPE AND RATING 120 LINE RATING 50 60Hz 60 VA MAX FUSE LINE 630 mAT SB 315 mAT SB 100 VAC 120 VAC 220 VAC 240 VAC CAT I MADE IN U S A DIGITAL I O RS 232 TRIGGER...

Page 28: ...2 Calibration...

Page 29: ...f 65 82 F 18 28 C with relative humidity of less than 70 unless otherwise noted Warm up period Allow the Model 2500 to warm up for at least one hour before performing calibration If the instrument has...

Page 30: ...ge voltage between LO and chassis ground is 200V DC Exceeding this value may cause a shock hazard CAUTION Maximum signal on OUTPUT connectors is 100V 20mA DC Maximum signal on INPUT connectors is 20mA...

Page 31: ...er the calibration menu press the MENU key select CAL then press ENTER Use the EDIT keys to move the cur sor and scroll through menu selections Press ENTER to select a MENU item Table 2 1 Recommended...

Page 32: ...arrow keys to choose the position Press for letters for numbers Enter the present password on the display Front panel default 002500 4 Once the correct password is displayed press the ENTER key You ca...

Page 33: ...K then enter the password Default 002500 3 Select CHANGE PASSWORD and then press ENTER The instrument will dis play the following New Pwd 002500 Use ENTER or EXIT 4 Using the EDIT keys enter the new p...

Page 34: ...awing at the end of Section 6 for the location of the CAL pads Viewing calibration dates and calibration count When calibration is locked only the UNLOCK and VIEW DATES selections will be accessible i...

Page 35: ...by using the SYST ERR query The Model 2500 will respond with the error number and a text message describing the nature of the error See Appendix B for details Aborting calibration steps To abort a cal...

Page 36: ...ltage bias calibration Channel 1 calibration Positive full scale output Zero output Negative full scale output Channel 2 calibration Positive full scale output Zero output Negative full scale output D...

Page 37: ...ect CHAN 1 then press ENTER The instrument will prompt for 10V calibration V CAL1 Press ENTER to Output 10 000 V 8 Press ENTER The instrument will display the following message DMM RDG 10 0000V Use EN...

Page 38: ...RATING 120 LINE RATING 50 60Hz 60 VA MAX FUSE LINE 630 mAT SB 315 mAT SB 100 VAC 120 VAC 220 VAC 240 VAC CAT I MADE IN U S A DIGITAL I O RS 232 TRIGGER LINK INPUT CHANNEL 1 INPUT CHANNEL 2 VOLTAGE SOU...

Page 39: ...to enter the CAL EXECUTION menu 6 Select V CAL then press ENTER The unit will display the following V CAL CHANNEL SELECT CHAN 1 CHAN 2 7 Select CHAN 2 then press ENTER The instrument will prompt for 1...

Page 40: ...INUED PROTECTION AGAINST FIRE HAZARD REPLACE FUSE WITH SAME TYPE AND RATING 120 LINE RATING 50 60Hz 60 VA MAX FUSE LINE 630 mAT SB 315 mAT SB 100 VAC 120 VAC 220 VAC 240 VAC CAT I MADE IN U S A DIGITA...

Page 41: ...itive full range current I FS 1 2 000000nA Use ENTER or EXIT 8 Set the calibrator current to 1 90000nA 9 Use the EDIT keys to adjust the Model 2500 display value to agree with the cali brator current...

Page 42: ...Calibration currents 2nA 1 90000nA 0 0000nA 1 90000nA 20nA 19 0000nA 0 0000nA 19 0000nA 200nA 190 000nA 0 000nA 190 000nA 2 A 1 90000 A 0 00000 A 1 90000 A 20 A 19 0000 A 0 0000 A 19 0000 A 200 A 190...

Page 43: ...0 250V LINE VOLTAGE 90 110V 180 220V 105 125V 210 250V WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE FU...

Page 44: ...ER The instrument will prompt for the positive full range current I FS 2 2 000000nA Use ENTER or EXIT 8 Set the calibrator current to 1 90000nA 9 Use the EDIT keys to adjust the Model 2500 display val...

Page 45: ...0 250V LINE VOLTAGE 90 110V 180 220V 105 125V 210 250V WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE FU...

Page 46: ...ired value and press ENTER Press ENTER again to confirm the date 5 Once the calibration dates are entered calibration is complete and the following message will be displayed CALIBRATION COMPLETE Press...

Page 47: ...ng to send commands Use the MENU key and the COMMUNICATION menu to access the IEEE 488 address Table 2 6 Remote calibration command summary Command Description CALibration PROTected CODE password SENS...

Page 48: ...OUR2 DMM_Reading OUTP2 OFF Triax shield cap on channel 1 INPUT jack DMM to channel 1 OUTPUT INPUT LO Figure 2 1 DMM to channel 1 OUTPUT INPUT LO Figure 2 1 DMM to channel 1 OUTPUT INPUT LO Figure 2 1...

Page 49: ...ge SOUR1 VOLT RANG 10 5 Send the following command to output 10V SOUR1 VOLT 10 6 Note and record the DMM reading and send that value as the parameter for the fol lowing command CAL PROT SOUR1 DMM_Read...

Page 50: ...the DMM DC voltage function and enable auto range 3 Send this command to turn on the channel 2 output OUTP2 ON 4 Send the following command to select the channel 2 10V voltage bias range SOUR2 VOLT RA...

Page 51: ..._Reading 11 Repeat steps 4 through 10 for the 100V range using Table 2 9 as a guide Be sure to Select the 100V range using the SOUR2 VOLT RANG 100 command Send the 100V source values where appropriate...

Page 52: ...ENS1 0 CAL PROT SENS1 1 9e 8 200nA 190 000nA 0 000nA 190 000nA SENS1 CURR RANG 2e 7 CAL PROT SENS1 1 9e 7 CAL PROT SENS1 0 CAL PROT SENS1 1 9e 7 2 A 1 90000 A 0 00000 A 1 90000 A SENS1 CURR RANG 2e 6...

Page 53: ...range using the SENS1 CURR RANG Range command Send the appropriate calibration current values with the CAL PROT SENS1 Current command Be sure to use the calibrator active amps mode for the 20mA range...

Page 54: ...00nA 19 0000nA SENS2 CURR RANG 2e 8 CAL PROT SENS2 1 9e 8 CAL PROT SENS2 0 CAL PROT SENS2 1 9e 8 200nA 190 000nA 0 0000nA 190 000nA SENS2 CURR RANG 2e 7 CAL PROT SENS2 1 9e 7 CAL PROT SENS2 0 CAL PROT...

Page 55: ...ate Note that the year month and date must be separated by commas Step 9 Save calibration constants Calibration is now complete so you can store the calibration constants in EEROM by sending the follo...

Page 56: ...3 RoutineMaintenance...

Page 57: ...ea WARNING Operating the instrument on an incorrect line voltage may cause dam age possibly voiding the warranty If the voltage setting is not correct change it as outlined below 1 Pry the small tab t...

Page 58: ...bleshooting information in Section 4 of this manual for additional information Table 3 1 Power line fuses Line voltage Fuse rating Keithley part no 100V 120V 0 630A Slo Blo 250V 5 20mm FU 106 630 220V...

Page 59: ...3 4 Routine Maintenance Model 2500 Service Manual...

Page 60: ...4 Troubleshooting...

Page 61: ...unt techniques and require specialized equipment and skills for repair If you are not equipped and or qualified it is strongly recommended that you send the unit back to the factory for repairs or lim...

Page 62: ...STS and press ENTER to display the following menu FRONT PANEL TESTS KEYS DISPLAY PATTERNS CHAR SET 4 Select KEYS and press ENTER to start the test When a key is pressed the label name for that key wil...

Page 63: ...ucture CHAR SET test The character set test lets you display all characters Perform the following steps to run the character set test 1 Display the MAIN MENU by pressing the MENU key 2 Select TEST and...

Page 64: ...crocomputer that controls the analog section front panel and GPIB and RS 232 ports as well as associated interfacing circuits Figure 4 1 Overall block diagram Front Panel Keypad 2 Line VFD GPIB RS 232...

Page 65: ...A D converter Each Model 2500 channel uses a multi slope charge balance A D converter with a single slope run down The converter is controlled by a gate array Commands are issued by the MPU to the ga...

Page 66: ...am Triax INPUT 20mA Max R Range 7 8 R Range 5 6 R Range 3 4 R Range 1 2 X10 Enable Floating Channel 1 2 Ground Output Enable Voltage Bias Source 0 to 10V 100V 20mA Max Earth Connect Voltage Source OUT...

Page 67: ...Figure 4 3 Regulated circuits include 5V and 15V to power the analog circuits and a separate 5VD supply to power digital circuits Unregulated 110V supplies power to the bias source output stages Figu...

Page 68: ...ration constants and the saved setups are stored in a separate serial EEPROM External communication is provided via GPIB and serial interfaces A 9914 GPIB IEEE 488 with standard interface ICs are used...

Page 69: ...leshooting information for the various circuits is summarized below Refer to the component layout drawings at the end of Section 6 for component locations Display board checks If the front panel displ...

Page 70: ...TP 15VB TP 5VB TP 5VB TP 110VB TP 110VB TP Check continuity Plugged into live receptacle power on 5V 5 15V 5 15V 5 5V 5 5V 5 110V 20 110V 20 5V 5 15V 5 15V 5 5V 5 5V 5 110V 20 110V 20 Remove to check...

Page 71: ...25 U163 pin 43 U171 pin 4 U163 pin 45 U163 pin 47 U165 pin 48 RAM OK ROM OK Digital common 5V Low on power up then goes high Check for stuck bits Check for stuck bits 20MHz Pulse train during RS 232...

Page 72: ...tput 2V 10V 100V range output 2V 100V 10V range output 2V 10V 100V range output 2V 100V Select chan 1 20mA range Chan 1 I V converter output Chan 1 A D input signal s Select chan 2 20mA range Chan 2 I...

Page 73: ...all other test leads and cables from the instrument 2 Remove the case cover as outlined in Section 5 3 Locate the firmware ROMs located on the digital section of the mother board These ROMs are the on...

Page 74: ...5 Disassembly...

Page 75: ...g PC boards Wear cotton gloves Only handle PC boards by the edges and shields Do not touch any board traces or components not associated with repair Do not touch areas adjacent to electrical contacts...

Page 76: ...r protective containers only at a properly grounded work station Ground yourself with a suitable wrist strap Handle the devices only by the body do not touch the pins Ground any printed circuit board...

Page 77: ...ing ears make sure to mount the right ear to the right side of the chassis and the left ear to the left side of the chassis Each ear is marked RIGHT or LEFT on its inside surface 3 Remove rear bezel T...

Page 78: ...ar panel Remove these screws 2 Remove mother board mounting screws Remove the four mounting screws that secure the mother board to the chassis 3 Unplug cables Unplug the display board ribbon cable fro...

Page 79: ...ed at the bot tom of the display board until the bar separates from the casing Pull the display board from the front panel 5 Remove the switch pad by pulling it from the front panel Removing power com...

Page 80: ...ical shock verify that power line ground green and yellow wire attached to the power mod ule is connected to the chassis Make sure the ground wires are attached to the power transformer mounting screw...

Page 81: ...5 8 Disassembly Model 2500 Service Manual...

Page 82: ...6 ReplaceableParts...

Page 83: ...lacement parts contact your Keithley representative or the factory see inside front cover for addresses When order ing parts be sure to include the following information Instrument model number Model...

Page 84: ...8 C371 C373 C381 C392 C399 C599 CAP 47P 5 100V CERAMIC C 465 47P C265 CAP 100P 10 100V CERAMIC C 451 100P C279 CAP 1UF 20 100V CERAMIC C 436 1 C280 C283 C289 C291 C293 C294 C301 C303 CAP 1UF 10 25V CE...

Page 85: ...590 C387 C389 C390 CAP 1UF 20 50V CERAMIC C 418 1 C595 C318 C322 C327 C370 C518 C522 C527 CAP 1UF 10 25V CERAMIC C 495 1 C601 C603 C604 C281 C315 C316 C515 C516 CAP 1UF 10 25V CERAMIC C 495 1 CR115 CR...

Page 86: ...R226 R227 R293 R295 R297 R299 R378 R578 RES 5 11K 1 100MW THICK FILM R 418 5 11K R229 R239 R278 R294 R296 R298 R304 R381 RES 100 1 100MW THICK FILM R 418 100 R238 RES 15k 1 100MW THICK FILM R 418 15K...

Page 87: ...7 R587 RES 2 49K 1 125MW METAL FILM R 391 2 49K R388 R588 RES 4 99K 1 125MW METAL FILM R 391 4 99K R390 R590 RES 6 04K 1 125MW THIN FILM R 423 6 04K R391 R591 RES NET TF 245 R396 R399 R596 R599 R319 R...

Page 88: ...576 U302 U502 IC POS VOLTAGE REG 15V 60MA LM2940CT 15 IC 1186 U303 U503 IC NEG VOLTAGE REG 15V 50MA LM2990T 15 IC 1187 U304 U305 U504 U505 IC OPTOCOUPLER 2611 IC 690 U308 U508 IC CMOS ANALOG SWITCH IC...

Page 89: ...U531 IC VOLTAGE REGULATOR IC 1132 U332 U532 IC 5V VOLTAGE REGULATOR IC 1134 U334 U534 U333 U533 IC DUAL HIGH CMR SPEED OPTO HCPL 2631 IC 588 VR101 DIODE ZENER 30V BZX84C30 DZ 106 30 VR303 VR304 VR503...

Page 90: ...K304 K305 RELAY SURFACE MOUNT RL 188 Q301 Q302 TRANS N MOSFET VN0605T TG 243 Q305 Q306 TRANS N CHANNEL FET 2N4392 TG 128 1 R300 R301 R302 R303 RES 500 1 1 10W METAL FILM R 263 500 R308 RES 50K 1 1 10...

Page 91: ...CR901 CR902 CR903 CR904 DIODE SWITCHING 250MA BAV103 RF 89 CR905 CR906 DIODE SWITCHING MMBD914 RF 83 DS901 VACUUM FLUORESCENT DISPLAY DD 51C J1032 CONN BERG CS 339 J1033 CONN HEADER STRAIGHT SOLDER PI...

Page 92: ...OT 428 319A 2 FOOT EXTRUDED FE 22A 2 FOOT RUBBER FE 6 1 FRONT PANEL MODIFIED 2400 318B 1 FUSE HOLDER FH 35 1 1 FUSE 630A 250V SLO BLO FUSE FU 106 630 1 HANDLE 428 329F 1 LABEL MC 233A 1 LED HIGH POWER...

Page 93: ...6 12 Replaceable Parts Model 2500 Service Manual...

Page 94: ...A Specifications...

Page 95: ...000 nA 100 fA 0 30 200 pA 0 02 20 pA 200 2 000000 A 1 pA 0 20 200 pA 0 02 20 pA 200 20 00000 A 10 pA 0 10 20 nA 0 01 2 nA 2 0 200 0000 A 100 pA 0 10 20 nA 0 01 2 nA 2 0 2 000000 mA 1 nA 0 10 2 A 0 02...

Page 96: ...supply Digital I O 1 trigger input 4 TTL Relay Drive outputs 33V 500mA diode clamped POWER SUPPLY 100V 120V 220V 240V 10 LINE FREQUENCY 50 60Hz POWER DISSIPATION 60VA WARRANTY 1 year EMC Complies with...

Page 97: ...ne year mea surement specifications as follows Accuracy of reading offset 0 1 1mA 50nA 1 A 50nA 1 05 A Thus the actual reading range is 1mA 1 05 A or from 0 99895mA to 1 00105mA Voltage bias accuracy...

Page 98: ...B CalibrationReference...

Page 99: ...word KI002500 Query calibration code password Calibrate active channel 1 current measurement range Set channel 1 current measurement calibration constants Query channel 1 current measurement calibrati...

Page 100: ...other calibration command The default remote password is KI002500 Note The CODE command should be sent only once before performing cali bration Do not send CODE before each calibration step To change...

Page 101: ...ck out calibration SAVE CALibration PROTected SAVE Purpose To save calibration constants in EEROM after the calibration procedure Format cal prot save Description The SAVE command stores internally ca...

Page 102: ...ote The year month and day parameters must be delimited by commas Example CAL PROT DATE 2000 11 20 Send cal date 11 20 2000 NDUE CALibration PROTected NDUE Purpose To send the next calibration due dat...

Page 103: ...ration current must be applied to the channel 1 or channel 2 input terminals Example CAL PROT SENS1 1 9e 3 Calibrate channel 1 2mA range DATA CALibration PROTected SENSe 1 DATA CALibration PROTected S...

Page 104: ...ers are determined from a DMM reading Example CAL PROT SOUR2 9 9 Calibrate channel 2 10V range DATA CALibration PROTected SOURce 1 DATA CALibration PROTected SOURce 1 DATA CALibration PROTected SOURce...

Page 105: ...rs If an error occurs during any calibration step the Model 2500 will generate an appropriate error message Several methods to detect calibration errors are discussed below Reading the error queue As...

Page 106: ...ck 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 com pletes the current op...

Page 107: ...nd 3 After sending a calibration command repeatedly test the ESB Event Summary bit bit 5 in the status byte until it is set Use STB to request the status byte 4 Once operation complete has been detect...

Page 108: ...C CalibrationProgram...

Page 109: ...ithley KPC 488 2 KPS 488 2 or KPC 488 2AT or CEC PC 488 IEEE 488 interface for the computer Three shielded IEEE 488 connecting cables Keithley Model 7007 Software requirements In order to use the cali...

Page 110: ...GPIB selection to check or change the address 4 Set the calibrator primary address to 17 and digital multimeter primary address to 16 5 Make sure that the computer bus driver software CECHP EXE is pro...

Page 111: ...263 CLS PRINT Model 2500 Calibration Program GOSUB KeyCheck PRINT 1 OUTPUT 25 CAL PROT CODE KI002500 Voltage bias calibration FOR I 1 TO 34 READ Cmd SELECT CASE I CASE 1 PRINT Connect shielded cap to...

Page 112: ...OT SENS2 CalPlus OPC GOSUB CalEnd PRINT 1 OUTPUT 17 V0X 0 current cal PRINT 1 OUTPUT 25 CAL PROT SENS2 0 OPC GOSUB CalEnd PRINT 1 OUTPUT 17 V CalMinus X FS current cal PRINT 1 OUTPUT 25 CAL PROT SENS2...

Page 113: ...files end program BEEP PRINT Calibration aborted PRINT 1 OUTPUT 25 CAL PROT LOCK PRINT 1 OUTPUT 25 RST PRINT 1 LOCAL 25 16 17 CLOSE END CmdList Voltage bias cal commands DATA CAL PROT SOUR1 OFFS DATA...

Page 114: ...nel 2 voltage calibration connections 2 13 Command summary B 2 Component layouts 6 3 Computer hardware requirements C 2 Connections for channel 1 bias voltage ve rification tests 1 11 Connections for...

Page 115: ...on self test 4 3 Principles of operation 4 4 Analog circuits 4 6 Digital circuitry 4 9 Overall block diagram 4 5 Power supply 4 8 Program C 1 Model 2500 calibration program C 4 R Recommended calibrati...

Page 116: ...erification test requirements 1 2 Environmental conditions 1 2 Line power 1 3 Warm up period 1 3 Viewing calibration dates and calibration count 2 7 Voltage bias accuracy 1 10 Voltage bias calibration...

Page 117: ......

Page 118: ...to zero Unstable Overload Will not read applied input Calibration only Certificate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measure...

Page 119: ......

Page 120: ......

Page 121: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...

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