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Keithley SourceMeter 2425, Service Manual

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Keithley SourceMeter 2425 Service Manual Download Page 79

4-14

Troubleshooting

Model 2425 Service Manual

Power supply checks

Power supply problems can be checked using Table 4-2. See “Principles of operation” for 
circuit theory on the power supply. 

Table 4-2

Power supply checks

Step

Item/component

Required condition

Remarks

1

2

3

4

5

6

7

8

9

Line fuse

Line power

TP502

TP503

TP504

TP505

TP507

TP508

TP510

Check continuity.

Plugged into live recepta-

cle, power on.

+150V, ±5%

-150V, ±5%

+38V, ±10%

-38V, ±10%

+15V, ±5%

-15V, ±5%

+5V, ±5%

Remove to check.

Check for correct power-up 

sequence.

Referenced to TP501.

Referenced to TP501.

Referenced to TP501.

Referenced to TP501.

+15VF, referenced to 

TP500.

-15VF, referenced to TP500. 

+5VF, referenced to TP500. 

Summary of Contents for SourceMeter 2425

Page 1: ...Model 2425100W SourceMeter Service Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E...

Page 2: ...DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF S...

Page 3: ...TAIWAN 1FL 85 Po Ai Street Hsinchu Taiwan R O C 886 3 572 9077 Fax 886 3 572 9031...

Page 4: ...Model 2425 100W SourceMeter Service Manual 2000 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Second Printing October 2004 Document Number 2425 902 01 Rev B...

Page 5: ...into the manual Addenda are numbered sequentially When a new Revision is created all Addenda associated with the previous Revi sion of the manual are incorporated into the new Revision of the manual E...

Page 6: ...cted to mains voltage or to voltage sources with high transient over voltages Measurement Category II connections require protection for high transient over voltages often as sociated with local AC ma...

Page 7: ...ages The symbol indicates a connection terminal to the equipment frame The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated informa...

Page 8: ...and output value 1 7 Setting the measurement range 1 8 Compliance considerations 1 8 Compliance limits 1 8 Types of compliance 1 8 Maximum compliance values 1 9 Determining compliance limit 1 9 Taking...

Page 9: ...Remote calibration 2 18 Remote calibration commands 2 18 Recommended calibration parameters 2 19 Remote calibration procedure 2 20 Single range calibration 2 26 3 Routine Maintenance Introduction 3 2...

Page 10: ...leaning 5 2 Handling PC boards 5 2 Solder repairs 5 2 Static sensitive devices 5 3 Assembly drawings 5 3 Case cover removal 5 4 Analog board removal 5 5 Digital board removal 5 6 Front panel disassemb...

Page 11: ...Detecting calibration step completion B 11 Using the OPC query B 11 Using the OPC command B 11 Generating an SRQ on calibration complete B 12 C Calibration Programs Introduction C 2 Computer hardware...

Page 12: ...ification 1 18 2 Calibration Figure 2 1 Voltage calibration test connections 2 10 Figure 2 2 10 A to 1A range current calibration test connections 2 13 Figure 2 3 3A range current calibration test con...

Page 13: ...age calibration 2 12 Table 2 4 Front panel current calibration 2 16 Table 2 5 Remote calibration command summary 2 18 Table 2 6 Recommended CALibration PROTected SENse parameter ranges 2 19 Table 2 7...

Page 14: ...splay board parts list 6 19 Table 6 4 Mechanical parts list 6 20 B Command Reference Table B 1 Remote calibration command summary B 2 Table B 2 Recommended CALibration PROTected SENSe parameter ranges...

Page 15: ......

Page 16: ...1 PerformanceVerification...

Page 17: ...ded for qualified service per sonnel only Do not attempt these procedures unless you are qualified to do so Some of these procedures may expose you to hazardous volt ages which could cause personal in...

Page 18: ...erification procedures If the instrument has been subjected to temperature extremes those outside the ranges stated above allow additional time for the instrument s internal temperature to stabilize T...

Page 19: ...ipment Description Manufacturer Model Specifications Digital Multimeter Hewlett Packard HP3458A DC Voltage1 1V 10V 100V 5 6ppm 4 3ppm 6 3ppm DC Current2 10 A 100 A 1mA 10mA 100mA 1A 25ppm 23ppm 20ppm...

Page 20: ...verification limits are calculated assume you are testing the 20V DC output range using a 20V output value Using the Model 2425 20V range one year accuracy specification of 0 02 of output 2 4mV offse...

Page 21: ...nch defaults Performing the verification test procedures Test summary DC voltage output accuracy DC voltage measurement accuracy DC current output accuracy DC current measurement accuracy Resistance m...

Page 22: ...ue Before testing each verification point you must properly set the source range and output value as outlined below 1 Press either the SOURCE V or SOURCE I key to select the appropriate source functio...

Page 23: ...s of compliance that can occur real and range Depending on which value is lower the output will clamp at either the displayed compliance setting real or at the maximum measurement range reading range...

Page 24: ...ance limit The relationships to determine which compliance is in effect are summarized as follows They assume that the measurement function is the same as the compliance function Compliance Setting Me...

Page 25: ...in speci fied limits This test involves setting the output voltage to each full range value and mea suring the voltages with a precision digital multimeter 1 With the power off connect the digital mul...

Page 26: ...del 2425 output voltage setting Output voltage limits 1 year 18 C to 28 C 200mV 2V 20V 100V 200 000mV 2 00000V 20 0000V 100 000V 199 360 to 200 640mV 1 99900 to 2 00100V 19 9936 to 20 0064V 99 968 to...

Page 27: ...source voltages with the same magnitudes as those listed in Table 1 4 6 Repeat the entire procedure using the rear panel INPUT OUTPUT jacks Be sure to select the rear panel jacks with the front panel...

Page 28: ...SourceMeter 250V PEAK 5V PEAK HI LO OUTPUT 125V PEAK 125V PEAK EDIT TOGGLE POWER RANGE INPUT OUTPUT 4 WIRE SENSE DISPLAY ON OFF TERMINALS FRONT REAR AUTO RANGE EXIT ENTER CONFIG MENU SWEEP TRIG REL L...

Page 29: ...UT OUTPUT jacks as shown in Figure 1 3 2 Select the multimeter DC volts measuring function 3 Press the Model 2425 SOURCE I key to source current and make sure the source output is turned on Figure 1 3...

Page 30: ...edure for a negative 3A current output value 6 Repeat the entire procedure using the rear panel INPUT OUTPUT jacks Be sure to select the rear panel jacks with the front panel TERMINALS key Table 1 5 O...

Page 31: ...mul timeter Verify that the Model 2425 current reading is within the limits given in the table NOTE It may not be possible to set the current source to the specified value Use the closest possible se...

Page 32: ...ocedure for a negative 3A current 6 Repeat the procedure using the rear panel INPUT OUTPUT jacks Be sure to select the rear panel jacks with the front panel TERMINALS key Table 1 6 Current measurement...

Page 33: ...ropriate safe value When using the manual source mode total resistance reading uncertainty includes both Source I and Measure V uncertainty see specifications and calculated reading limits should take...

Page 34: ...modify reading limits accordingly Select the appropriate ohms measurement range with the RANGE keys Verify that the Model 2425 resistance reading is within the limits given in the table 6 Repeat the...

Page 35: ...1 20 Performance Verification Model 2425 Service Manual...

Page 36: ...2 Calibration...

Page 37: ...and relative humidity Conduct the calibration procedures at an ambient temperature of 18 to 28 C 65 to 82 F with relative humidity of less than 70 unless otherwise noted Warm up period Allow the Model...

Page 38: ...occurs during calibration the Model 2425 will generate an appropriate error message See Appendix B for more information WARNING The maximum common mode voltage voltage between LO and chas sis ground...

Page 39: ...Voltage1 DC Current1 1V 10V 100V 10 A 100 A 1mA 10mA 100mA 1A 5 6ppm 4 3ppm 6 3ppm 25ppm 23ppm 20ppm 20ppm 35ppm 110ppm Precision Resistor2 Isotec RUG Z 1R00 0 1 1 0 1 100W 1 90 day full range accurac...

Page 40: ...s up RANGE for numbers Enter the present password on the display Front panel default 002425 4 Once the correct password is displayed press the ENTER key If the password was correctly entered the follo...

Page 41: ...IXED OFF ON 1 Immediate 1 Immediate SENS FUNC CONC OFF SENS FUNC source_ function SENS VOLT NPLC 1 0 SENS VOLT RANG range SENS CURR NPLC 1 0 SENS CURR RANG range SENS AVER COUN 10 SENS AVER TCON REPea...

Page 42: ...ollowing New Pwd 002425 Use ENTER or EXIT 4 Using the range keys and the left and right arrow keys enter the new password on the display 5 Once the desired password is displayed press the ENTER key to...

Page 43: ...menu To view calibration dates and calibration count at any time 1 From normal display press MENU select CAL and then press ENTER The unit will display the following CALIBRATION UNLOCK EXECUTE VIEW DA...

Page 44: ...e functions Note that each range is separately calibrated by repeating the entire procedure for each range Step 1 Prepare the Model 2425 for calibration 1 Turn on the Model 2425 and the digital multim...

Page 45: ...TPUT 125V PEAK 125V PEAK EDIT TOGGLE POWER RANGE INPUT OUTPUT 4 WIRE SENSE DISPLAY ON OFF TERMINALS FRONT REAR AUTO RANGE EXIT ENTER CONFIG MENU SWEEP TRIG REL LOCAL FILTER LIMIT DIGITS SPEED V MEAS I...

Page 46: ...2425 will source 0mV and at the same time display the following DMM RDG 000 0000mV Use ENTER or EXIT 11 Note and record the DMM reading and then adjust the Model 2425 display to agree with the actual...

Page 47: ...sure to select the appropriate source range with the EDIT and RANGE keys before calibrating each range 21 Press EXIT as necessary to return to normal display Table 2 3 Front panel voltage calibration...

Page 48: ...PEAK 125V PEAK EDIT TOGGLE POWER RANGE INPUT OUTPUT 4 WIRE SENSE DISPLAY ON OFF TERMINALS FRONT REAR AUTO RANGE EXIT ENTER CONFIG MENU SWEEP TRIG REL LOCAL FILTER LIMIT DIGITS SPEED V MEAS I FCTN V I...

Page 49: ...2425 will source 0mA and at the same time display the following DMM RDG 00 00000 A Use ENTER or EXIT 11 Note and record the DMM reading and then adjust the Model 2425 display to agree with the actual...

Page 50: ...up RANGE keys before calibrating each range 21 After calibrating the 1A range connect the 1 characterized resistor and DMM to the Model 2425 INPUT OUTPUT jacks as shown in Figure 2 3 22 Select the DMM...

Page 51: ...0mA ___________ mA ___________ mA ___________ mA ___________ mA 100mA 100 00mA 000 00mA 100 00mA 000 00mA ___________ mA ___________ mA ___________ mA ___________ mA 1A 1 0000A 0 0000A 1 0000A 0 0000A...

Page 52: ...Press ENTER again to confirm the date 6 The unit will then prompt for the calibration due date NEXT CAL 12 15 2001 Use ENTER or EXIT 7 Set the calibration due date to the desired value then press ENT...

Page 53: ...ady unlocked Default password KI002425 Query number of times 2425 has been calibrated Save calibration data to EEPROM Lock calibration inhibit SAVE command operation Request cal lock status Program ca...

Page 54: ...four parameters two zero parameters a posi tive full scale parameter and a negative full scale parameter Table 2 6 Recommended CALibration PROTected SENse parameter ranges Sense range First parameter...

Page 55: ...er steps for each range may be performed in any order but all parameter steps for each range must be completed For optimum calibration use parameters within recommended limits Remote calibration proce...

Page 56: ...would be CAL PROT SOUR 1 998 CAL PROT SENS 1 998 Program the voltage source for 0V output using the SOUR VOLT 0 0 com mand Note the multimeter reading Send the source and sense calibration commands us...

Page 57: ...Restore GPIB defaults Activate voltage source Current limit when voltage source is active Make sure 1A range is not active Maximum allowable source voltage Disable remote sensing Unlock cal Turn sour...

Page 58: ...urce function negative full scale Set output to 0V Read actual output value Calibrate sense function negative zero Calibration source function negative zero Establish positive full range polarity Read...

Page 59: ...ands using the multimeter reading as the parameter For example CAL PROT SOUR 1 03E 3 CAL PROT SENS 1 03E 3 Send the SOUR CURR 0 0 command to set the source current to 0A Note and record the multimeter...

Page 60: ...e Set output to 0A Read actual output value Calibrate sense function negative zero Calibration source function negative zero Establish positive full range polarity Read actual output value Calibrate s...

Page 61: ...bration To lock out further calibration send the following command after completing the calibra tion procedure CAL PROT LOCK Single range calibration Normally the complete calibration procedure should...

Page 62: ...3 RoutineMaintenance...

Page 63: ...USE WITH SAME TYPE AND RATING CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE FUSE WITH SAME TYPE AND RATING MADE IN U S A INPUT OUTPUT 250V PEAK 125V PEAK TRIGGER LINK 4 WIRE SENSE LO LI...

Page 64: ...ble 3 1 3 Re install the fuse carrier NOTE If the power line fuse continues to blow a circuit malfunction exists and must be corrected Refer to the troubleshooting section of this manual for additiona...

Page 65: ...3 4 Routine Maintenance Model 2425 Service Manual...

Page 66: ...4 Troubleshooting...

Page 67: ...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 limit repairs to t...

Page 68: ...each front panel key Perform the fol lowing steps to run the KEYS test 1 Display the MAIN MENU by pressing the MENU key 2 Select TEST and press ENTER to display the SELF TEST MENU 3 Select DISPLAY TE...

Page 69: ...rmal opera tion Horizontal lines pixels of the first digit are sequenced Vertical lines pixels of the first digit are sequenced Each digit and adjacent annunciator is sequenced All the pixels of the s...

Page 70: ...uitry block diagram Overall block diagram Figure 4 1 shows an overall block diagram of the Model 2425 Circuitry may be divided into three general areas Analog circuits includes sourcing circuits such...

Page 71: ...O RS 232 I O GPIB I O Digital Section DACs Clamps Output Stage Feedback Front Panel Controller Trigger Digital I O Trigger Link GPIB Interface RS 232 Display Keyboard Guard Buffer To Analog Circuits T...

Page 72: ...rity bit in the Vclamp I clamp circuit controls these functions The error amplifier adds open loop gain and slew rate control to the system to assure accuracy and provide a controllable signal for the...

Page 73: ...ile providing universal inputs and power factor correction for the 120 240V line The digital board runs off of 5V and 12V supplies derived from the switcher The 12VD supply is set to pro gram the flas...

Page 74: ...The output stage drive transistors are biased in class B configuration to prevent the possi bility of thermal runaway with high current output values Output transistors Q518 and Q521 are cascoded with...

Page 75: ...Troubleshooting Model 2425 Service Manual Figure 4 4 Output stage simplified schematic O F F Q518 Maindrive 300K Q521 Q523 Q525 Q507 42V 85V HI Drive Q503 F 85V Q504 Q514 42V HI Drive Q500 Q516 15Vf...

Page 76: ...around the voltage drop in the guard leads since significant current can flow 50mA Digital circuitry Refer to Figure 4 5 for the following discussion on digital circuitry The core digital circuitry us...

Page 77: ...r Digital I O U7 Digital I O Display board circuit theory Display board components are shown in the digital circuitry block diagram in Figure 4 5 U902 is the display microcontroller that controls the...

Page 78: ...read the keyboard A key is read by strobing the columns and reading all rows for each strobed column Key down data is interpreted by the display microcontroller and sent back to the main microprocesso...

Page 79: ...component Required condition Remarks 1 2 3 4 5 6 7 8 9 Line fuse Line power TP502 TP503 TP504 TP505 TP507 TP508 TP510 Check continuity Plugged into live recepta cle power on 150V 5 150V 5 38V 10 38V...

Page 80: ...in 25 U3 pin 43 U3 pin 44 U3 pin 45 U3 pin 47 RAM OK ROM OK Digital common 5V Low on power up then goes high Check for stuck bits Check for stuck bits 16 78MHz Pulse train during RS 232 I O Pulse trai...

Page 81: ...strument from the power line and all other equip ment before changing the battery The volatile memories of the Model 2425 are protected by a replaceable battery when power is off Typical battery life...

Page 82: ...7 Bulk quantities of lithium batteries should be disposed of as hazardous waste Battery replacement procedure 1 Remove the case cover and analog board assembly as covered in Section 5 2 Locate the bat...

Page 83: ...ds and cables from the instrument 2 Remove the case cover as outlined in Section 5 3 Remove the analog board assembly as outlined in Section 5 4 Locate the two firmware ROMS U15 and U16 located on the...

Page 84: ...5 Disassembly...

Page 85: ...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 Use dry nitr...

Page 86: ...ontainers only at a properly grounded work station Also ground yourself with a suitable wrist strap Handle the devices only by the body do not touch the pins Ground any printed circuit board into whic...

Page 87: ...rs Remove the screw that secures each mounting ear Pull down and out on each mounting ear NOTE When re installing the mounting ears make sure to mount the right ear to the right side of the chassis an...

Page 88: ...s off the pin connectors then remove the ferrite noise filters from the chassis During re assembly use the fol lowing table to identify input terminals Input terminals Front wire color Rear wire color...

Page 89: ...This procedure assumes that the analog board assembly is already removed NOTE In order to remove the digital board the display board must first be removed 1 Remove IEEE 488 Digital I O and RS 232 fast...

Page 90: ...e the switch pad by pulling it from the front panel Removing power components The following procedures to remove the power supply and or power module require that the case cover and motherboard be rem...

Page 91: ...ed to the chassis Also make sure the two bottom case screws are properly installed to secure and ground the case cover to the chassis Re assemble the instrument by reversing the previous disassembly p...

Page 92: ...6 ReplacementParts...

Page 93: ...rder ing parts be sure to include the following information Instrument model number Model 2425 Instrument serial number Part description Component designation if applicable Keithley part number Factor...

Page 94: ...C C 495 1 C258 C259 C260 C263 C269 C271 C273 C282 CAP 1UF 10 25V CERAMIC C 495 1 C267 C268 C327 CAP 1000P 10 100V CERAMIC C 451 1000P C283 CAP 100P 10 100V CERAMIC C 451 100P C284 C291 C305C310 C321 C...

Page 95: ...8 1000P C606 C607 C613 C614 C617 C618 C619 C620 CAP 1UF 10 25V CERAMIC C 495 1 C610 C612 CAP 2200P 10 100V CERAMIC C 430 2200P C621 C622 C623 C624 C625 C650 C651 C652 CAP 1UF 10 25V CERAMIC C 495 1 C6...

Page 96: ...294 Q208 Q210 Q212 Q214 Q216 Q218 TRANS NPN CATV SILICON MPSH17 TG 221 Q209 Q211 Q213 Q215 Q217 Q219 TRANS CURR REG CDLL5313 TG 321 Q220 TRANS NPN SILICON MJE340 TG 209 Q221 TRANS PNP POWER MJE350 TG...

Page 97: ...TRANS N CHANNEL MOSFET SI9410DY TG 302 Q532 Q536 TRANS N CHANNEL FET IRF630 TG 214 Q533 Q539 TRANS P CHANNEL 200V FET IRF9630 TG 215 R117 R128 R133 R136 R141 R144 RES 10K 5 250MW METAL FILM R 376 10K...

Page 98: ...4 99K R264 R267 R345 R364 R370 R371 R372 R402 RES 100K 1 100MW THICK FILM R 418 100K R272 R273 R347 R348 R511 R512 R589 RES 249K 1 100MW THICK FILM R 418 249K R279 RES 20K 1 100MW THICK FILM R 418 20K...

Page 99: ...MW THICK FILM R 418 6 04K R363 RES NET VARIOUS 1 1W TF 274 R368 R212 RES 332 1 100MW THICK FILM R 418 332 R375 R376 R576 R578 R536 R537 RES 10 10 100MW THICK FILM R 418 10 R388 R393 R399 R411 R412 R69...

Page 100: ...1K R530 R532 R534 R712 RES 1K 1 100MW THICK FILM R 418 1K R538 R539 R540 R541 R542 R543 R568 R569 RES 5 5 1W METAL FILM R 444 5 R547 R588 RES 100K 1 100MW THICK FILM R 418 100K R553 R554 RES 75K 1 100...

Page 101: ...18 0499 R683 R686 RES 1K 1 125W THIN FILM R 456 1K R690 R694 RES 100K 5 250MW METAL FILM R 376 100K R700 R701 RES 49 9K 1 100MW THICK FILM R 418 49 9K R706 R707 R708 R709 R501 R514 R529 R431 RES 1K 1...

Page 102: ...9 U231 U234 U235 U262 IC OP AMP LOW POWER AD795JR IC 1052 U221 U227 IC DIFF AMP AMP03GP IC 988 U222 IC OP AMP LTC1050CS8 IC 791 U223 U411 U507 U508 IC MOSFET DRIVER TLP591B IC 877 U224 U602 U603 U651...

Page 103: ...U609 PROGRAMMED ROM 2400 801 U660 U661 IC 16 BIT DAC AD7849BR IC 1004 VR200 VR201 DIODE ZENER MM524694 TI DZ 113 VR202 VR203 VR407 VR408 VR409 VR506 DIODE ZENER 5 1V BZX84C5V1 DZ 88 VR214 VR215 DIODE...

Page 104: ...10 100V CERAMIC C 451 100P C131 CAP 470U 20 50V ALUM ELEC C 570 470 C15 C37 C204 C205 C206 C207 C208 C209 CAP 01U 10 500V CERAMIC C 497 01 C19 C69 C85 C75 C92 C200 C201 CAP 1UF 10 25V CERAMIC C 495 1...

Page 105: ...822T31 RF 95 CR14 CR15 CR22 CR24 CR5 CR32 CR33 DIODE DUAL SWITCHING BAV99L RF 82 CR1 CR4 CR35 CR37 CR38 CR39 CR47 ULTRAFAST POWER RECTIFIER RF 107 CR201 CR202 CR203 CR204 CR205 DIODE DUAL COMMON ANODE...

Page 106: ...4 Q12 Q7 TRANS HEXFET POWER MOSFET IRF1540N TG 382 Q13 TRANS N CHAN MOSFET 2SK1412 TG 276 Q14 TRANS PNP MMBT3906L TG 244 Q2 TRANS HEXFET POWER MOSFET IRFP450 TG 338 Q8 POWER MOSFET IRFIZ34G TG 313 Q9...

Page 107: ...4 75K 1 100MW THICK FILM R 418 4 75K R3 RES 11K 1 100MW THICK FILM R 418 11K R30 R117 RES 100 1 100MW THICK FILM R 418 100 R33 R92 R95 RES 0499 1 100MW THICK FILM R 418 0499 R36 R47 RES 10K 1 100MW T...

Page 108: ...613 74K RT 8 RV1 JUNCTION TRANSIENT VOLT SUPPR P4KE440 VR 10 RV101 METAL OXIDE VARISTOR 275LA40 VR 7 S01 SO2 SOCKET PLCC 032 T A SO 143 32 S1 SWITCH PUSHBUTTON 6 POLE SW 466 T1 TRANSFORMER TR 335A T2...

Page 109: ...REF LT1004CZ 2 5 IC 929 U3 IC MICROCONTROLLER MC68332 FC LSI 161 U4 IC 5V RS 232 TRANSCEIVER MAX202 IC 952 U5 IC OP AMP AD705JR IC 814 U6 IC OCTAL INTER BUS TRANS 75161 IC 647 U7 IC PROTECTED QUAD POW...

Page 110: ...CHING MMBD914 RF 83 DS901 VACUUM FLUORESCENT DIS PLAY DD 51C J1032 CONN BERG CS 339 J1033 CONN HEADER STRAIGHT SOLDER PIN CS 368 16 Q901 Q902 TRANS NPN GEN PURPOSE BC868 TG 293 R901 RES NET 15K 2 1 87...

Page 111: ...6 20 Replacement Parts Model 2425 Service Manual Order current firmware revision for example 7001 800A01 Table 6 3 Display board parts list...

Page 112: ...OM SHIELD 2420 309A 4 CHOKE CH 58 1A 1 COVER 2420 317A 1 DISPLAY LENS 2425 311A 1 FAN FN 33 2 2 FOOT 428 319A 2 FOOT EXTRUDED FE 22A 2 FOOT RUBBER FE 6 1 HANDLE 428 329F 1 HEAT SINK 2420 308B 2 HOLDER...

Page 113: ...6 22 Replacement Parts Model 2425 Service Manual...

Page 114: ...A Specifications...

Page 115: ...Thus the actual reading range is 10V 2 5mV or from 9 9975 to 10 0025V Current measurement calculations are performed in exactly the same manner using the pertinent specifications ranges and input sig...

Page 116: ...B CommandReference...

Page 117: ...cal is unlocked changes password Default password KI002425 Query number of times 2425 has been calibrated Save calibration data to EEPROM Lock calibration inhibit SAVE command operation Request cal lo...

Page 118: ...command The default remote password is KI002425 Note The CODE command should be sent only once before performing calibration Do not send CODE before each calibration step To change the code first sen...

Page 119: ...calibration constants in EEROM after the calibration procedure Format cal prot save Description The SAVE command stores internally calculated calibration constants derived during comprehensive calibra...

Page 120: ...Note The year month and day parameters must be delimited by commas Example CAL PROT DATE 2000 7 20 Send cal date 7 20 00 NDUE CALibration PROTected NDUE Purpose To send the next calibration due date t...

Page 121: ...ding on the active SENS FUNC and range If the parameter does not fit into any of the three allowed ranges an error number 222 Parameter data out of range will be generated Once the unit has successful...

Page 122: ...ted SOURce Purpose To calibrate the source function Format cal prot sour nrf Parameters See Table B 3 for recommended parameter ranges Description The CAL PROT SOUR command calibrates the Model 2425 s...

Page 123: ...ameter ranges Source range First parameter negative full scale Second parameter negative zero Third parameter positive full scale Fourth parame ter positive zero 0 2V 2V 20V 100V 10 A 100 A 1mA 10mA 1...

Page 124: ...NC VOLT DC Select DC sense function SENS VOLT DC RANGE 0 2 Choose 200mV range CAL PROT SENS DATA Request cal constants Detecting calibration errors If an error occurs during any calibration step the M...

Page 125: ...rement offset calibration constant Error 508 Will occur when a CAL PROT SENS command generates an invalid measurement gain calibration constant Table B 4 Calibration errors Error number Error message...

Page 126: ...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 2 When MAV is set a message is available in the output queue and you can read the...

Page 127: ...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 operat...

Page 128: ...C CalibrationPrograms...

Page 129: ...bration programs IBM PC 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 So...

Page 130: ...on to check or change the address 4 Ensure the digital multimeter primary address is set to its factory default setting 22 5 Ensure that the computer bus driver software CECHP EXE is properly initiali...

Page 131: ...ialize 3458A PRINT 1 OUTPUT 22 NPLC 10 NDIG 7 TRIG LINE FUNC DCV AUTO OneOhm 1 Use characterized 1 ohm value CLS PRINT Model 2425 Calibration Program PRINT Connect DMM volts input to Model 2425 INPUT...

Page 132: ...calibration date yyyy mm dd D PRINT 1 OUTPUT 24 CAL PROT DATE D LINE INPUT Enter calibration due date yyyy mm dd D PRINT 1 OUTPUT 24 CAL PROT NDUE D PRINT 1 OUTPUT 24 CAL PROT SAVE Save calibration c...

Page 133: ...T 1 OUTPUT 24 RST PRINT 1 LOCAL 22 24 CLOSE END VoltsInit Calibration command lists DATA RST SOUR FUNC VOLT SENS CURR PROT 0 1 DATA SENS CURR RANG 0 1 SOUR VOLT PROT LEV MAX SYST RSEN OFF DATA CAL PRO...

Page 134: ...24 Put 2425 in remote PRINT 1 OUTPUT 24 RST Restore defaults CLS PRINT 1 OUTPUT 24 SENS FUNC CONC OFF PRINT 1 OUTPUT 24 SENS FUNC VOLT DC PRINT 1 OUTPUT 24 SOUR FUNC VOLT PRINT 1 OUTPUT 24 CAL PROT C...

Page 135: ...OUTPUT 24 CAL PROT SENS DATA PRINT 1 ENTER 24 LINE INPUT 2 Data PRINT Data PRINT 1 OUTPUT 24 CAL PROT SOUR DATA PRINT 1 ENTER 24 LINE INPUT 2 Data PRINT Data Range Range 10 IF Range 9 AND Range 11 THE...

Page 136: ...B Battery replacement Precautions 4 17 Procedure 4 17 C Calibration Considerations 2 3 Cycle 2 3 Equipment 2 4 C 2 Errors 2 8 B 9 Parameters 2 19 Remote 2 18 Remote command summary 2 18 Remote calibr...

Page 137: ...Reading the error queue B 9 Status byte EAV Error Available bit B 10 Using the OPC query B 11 Using the OPC command B 11 F Factory service 6 2 Front panel Calibration 2 9 Current calibration 2 13 Dis...

Page 138: ...questing calibration constants C 7 Resetting the calibration password 2 8 Resistance Limits calculation 1 19 Measurement accuracy 1 18 Restoring factory defaults 1 6 S Setting the measurement range 1...

Page 139: ......

Page 140: ...nable to zero q Unstable q Overload q Will not read applied input q Calibration only q Certificate of calibration required q Data required attach any additional sheets as necessary Show a block diagra...

Page 141: ......

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