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Model 2400SourceMeter® Service Manual

1. Calibration Programs C 5 C 6 Calibration Programs Requesting calibration constants Program C 2 listed below demonstrates how to request the calibration constants from the Model 2400 The program requests and displays the calibration constants for all ranges of both the volts and current measurement functions Program C 2 Requesting calibration constants Example program to request calibration constants 24 Open IEEE 488 output path Open IEEE 488 input path Set input terminator Set output terminator Put 2400 in remote Restore defaults PUT 24 CAL PROT CODE KI002400 Unlock calibration Initial range 200mV Voltage Calibration Constants PRINT Loop for all volts ranges SOUR VOLT RANGE Range CAL PROT SENS DATA CAL PROT SOUR DATA 24 SENS FUNC CURR DC Model 2400 primary address OPE IEEE FOR OUTPUT AS 41 OPE IEEE FOR INPUT AS 2 PRINT INTERM CRLF PRINT OUTTERM LF PRINT REMOTE 24 PRINT OUTPUT 24 RST CLS PRINT OUTPUT 24 SENS FUNC CONC OFF PRINT OUTPUT 24 SENS FUNC VOLT DC PRINT OUTPUT 24 SOUR FUNC VOLT PRINT 1 OUT Range 2 PRINT Model 2400 DO PRINT 1 OUTPUT 24 PRINT 1 OUTPUT 24 PRINT 1 ENTER 24 LINE INPUT 2 Data PRINT Data PRINT 1 OUTPUT 24 PRINT 1 ENTER 24 LINE INPUT 2 Data PRINT DATAS
2. Output current accuracy Current measurement accuracy Resistance measurement accuracy 2 Calibration Environmental conditions 2 Temperature and relative humidity Warm Up period uu dene Perte tust qa t reed Line c M Calibration considerations Calibration cycle cerent triti en Recommended calibration equipment Unlocking calibration Changing the password Resetting the calibration password Viewing calibration dates and calibration count Calibration errors ntes roe pe Front panel calibration Remote calibration Remote calibration commands Remote calibration procedure sess Single range calibration Routine Maintenance Introduction 3 2 Line fuse replacement 3 2 Troubleshooting In
3. END IF FOR I 1 TO Max READ Cmd PRINT 1 OUTPUT 24 Cmd NEXT I WHILE Range Limit If J THEN RESTORE VoltsCal FLSE RESTORE CurrentCal IF J THEN PRINT Calibrating volts ELSE PRINT Calibrating current FOR I 110 12 READ Cmd SELECT CASE I CASE 1 PRINT 1 OUTPUT 24 Cmd Range Case 2 PRINT 1 OUTPUT 24 Cmd Range GOSUB ReadDMM CASE 3 4 6 7 9 10 12 PRINT 1 OUTPUT 24 Cmd Reading OPC GOSUB CalEnd GOSUB ErrCheck CASE 5 11 PRINT 41 OUTPUT 24 Cmd GOSUB ReadDMM CASE 8 PRINT 41 OUTPUT 24 Cmd Range GOSUB ReadDMM END SELECT EXT I Range Range 10 WEND NEXT J LINE INPUT Enter calibration date yyyy mm dd D PRINT OUTPUT 24 CAL PROT DATE D LINE INPUT Enter calibration due date yyyy mm dd D PRINT OUTPUT 24 CAL PROT NDUE D PRINT OUTPUT 24 CAL PROT SAVE Save calibration constants GOSUB ErrCheck PRINT OUTPUT 24 CAL PROT LOCK Lock out calibration PRINT Calibration completed PRINT OUTPUT 24 RST PRINT LOCAL 22 24 CLOSE END KeyCheck Check for key press routine WHILE INKEYS WEND Flush keyboard buffer PRINT PRINT Press any key to continue ESC to abort program DO I INKEY LOOP WHILE I IF IS CHR 27 THEN GOTO EndProg Abort if ESC is pressed RETURN CalEnd Check for cal step completion DO PRINT 41 SRQ Request SRQ status INPUT 2
4. List of Tables 1 Performance Verification Table 1 1 Recommended verification equipment Table 1 2 Output voltage accuracy limits Table 1 3 Voltage measurement accuracy limits Table 1 4 Output current accuracy limits Table 1 5 Current measurement accuracy limits Table 1 6 Ohms measurement accuracy limits 2 Calibration Table 2 1 Recommended calibration equipment Table 2 2 Calibration unlocked states Table 2 3 Front panel voltage calibration Table 2 4 Front panel current calibration Table 2 5 Remote calibration command summary Table 2 6 CALibration PROTected SENSe parameter ranges Table 2 7 CALibration PROTected S OURce parameter ranges Table 2 8 Voltage calibration initialization commands Table 2 9 Voltage range calibration commands Table 2 10 Current calibration initialization commands Table 2 11 Current range calibration commands 3 Routine Mainten
5. Sourcerange Source current Multimeter current reading 1uA 1 0000 HA 0 0000u A HA 1 0000uA uA 0 0000uA uA 10uA 10 000 HA 00 000HA HA 10 000uA uA 00 000uA uA 100pA 100 00HA HA 000 00uA HA 100 00 HA 000 00 ImA 1 0000mA mA 0 0000mA mA 1 0000mA mA 0 0000mA mA 10mA 10 000mA mA 00 000mA mA 10 000mA mA 00 000mA mA 100mA 100 00mA mA 000 00mA mA 100 00mA mA 000 00mA mA 1A 1 0000A A 0 0000A A 1 0000A A 0 0000A A Use EDIT and RANGE keys to select source range Multimeter reading used in corresponding calibration step See procedure Calibration 2 15 Step 4 Enter calibration dates and save calibration NOTE For temporary calibration without saving new calibration constants proceed to Step 5 Lock out calibration 1 From normal display press MENU 2 Select CAL and then press ENTER The Model 2400 will display the following CALIBRATION UNLOCK EXECUTE VIEW D ATES p gt SAVE LOCK CHANGE PASSW 0 RD 3 Select SAVE and then press ENTER The instrument will display the following SAVE CAL Press ENTER to continue EXIT to abort calibration sequence 4 Press ENTER The unit will prompt you for the calibration date CAL DATE 12 15 95 Use 4 V ENTER or EXIT 5 Change the displayed date to today s date and then press the ENTER key Press ENTER again to confirm the date 6 Theunit will then prompt for the calibration due date NEXT CAL 12
6. 4 Once operation complete has been detected clear OPC status using one of two meth ods 1 use the ESR query and then read the response to clear the standard event sta tus register or 2 send the CLS command to clear the status registers Note that sending CLS will also clear the error queue and operation complete status B 12 Command Reference Generating an SRQ on calibration complete An IEEE 488 bus SRQ service request can be used to detect operation complete instead of repeatedly polling the Model 2400 To use this method send both ESE 1 and SRE 32 to the instrument and then include the OPC command at the end of each calibration command line as previously discussed Clear the SRQ by querying the ESR using the ESR query to clear OPC status and then request the status byte with the STB query Refer to your controller s documentation for information on detecting and servicing SRQs Calibration Programs C 2 Calibration Programs Introduction This appendix includes a calibration program written in BASIC to help you calibrate the Model 2400 as well as an example program that demonstrates how to request calibration constants Refer to Section 2 for more details on calibration procedures equipment and connections Computer hardware requirements The following computer hardware is required to run the calibration programs IBM PC AT or compatible computer Keithley KPC 488 2 KPS 488 2 or KP
7. day Description The DATE command allows you to store the calibration date in instrument EEROM for future reference You can read back the date from the instru ment by using the DATE query or by using the front panel CAL menu Note The year month and day parameters must be delimited by commas Example CAL PROT DATE 1995 11 20 Send cal date 11 20 95 NDUE CALibration PRO Tected N D U E Purpose To send the next calibration due date to the instrument Format cal prot ndue year month day Parameter year 1995 to 2094 lt month gt to 12 day 1 to 31 Query cal prot ndue Response year month day Description The NDUE command allows you to store the date when calibration is next due in instrument memory You can read back the next due date by using the NDUE query or by using the front panel CAL menu Note The next due date parameters must be delimited by commas Example CAL PROT NDUE 1996 11 20 Send due date 11 20 96 B 6 Command Reference SEN SE CALibration PRO Tected SEN Se Purpose To calibrate the sense function Format cal prot sens lt nrf gt Parameter See Table B 2 Description The CAL PROT SENS command calibrates the Model 2400 sense func tion To use this command you must 1 program the source to the correct value 2 select the range being calibrated and 3 send the CAL PROT SENS command for each parameter listed in Table B 2 Note W
8. 1 Specifications valid for continuous output currents below 105mA For operating above 105mA continuous for gt 1 minute der ate accuracy 10 35mA above 105mA Full operation 1A regardless of load to 30 C Above 30 C ambient derate 35mA C and prorate 35mA Q load 4 wire mode For current sinking up to 10W external power at 23 C Above 23 C derate 1W C 3For sink mode to 100mA range accuracy is 0 15 offset 4 For 1A range accuracy is 1 5 offset 8 ADDITIONAL SOURCE SPECIFICATIONS TRANSIENT RESPONSE TIME 30us typical for the output to recover to its spec following a step change in load Resistive load COMMAND PROCESSING TIME Maximum time required for the output to begin to change following the receipt of SOU Rce VOLTage CURRent lt nrf gt command Autorange On 10ms Autorange Off 7ms OUTPUT SETTLING TIME Time required to reach 0 1 of final value after command is processed 100us typical Resistive load Specifications A 3 2400 SPECIFICATIONS cont OUTPUT SLEW RATE 0 5V us 200V range 100mA compliance 0 08V us 2V and 20V ranges 100mA compliance DC FLOATING VOLTAGE Output can be floated up to 3250VDC from chassis ground REMOTE SENSE Up to 1V drop per load lead COMPLIANCE ACCURACY Add 0 196 of range to base specification OVER TEMPERATURE PROTECTION Internally sensed temperature overload puts unit in standby mode RANGE CHANGE OVERSHOOT Overshoot into a fully resistive 10
9. CALIBRATION UNLOCK EXECUTE VIEW D ATES p gt SAVE LOCK CHAN GE PASSWO RD Select EXECUTE and then press ENTER The instrument will display the following message V CAL Press ENTER to Output 200 00mV Press ENTER The Model 2400 will source 200mV and simultaneously display the following DMM RDG 200 0000mV Use lt gt V ENTER or EXIT Calibration 2 9 Figure 2 1 Voltage calibration connections DISPLAY 4WIRE SENSE H SOURCE ee 11 1 00000000 amp 1 2 3 4 5 Co Gam Gyr CAD s 7 en GED ED 2 Model 2400 Input LO 10 11 12 Digital Multimeter Note and record the DMM reading and then adjust the Model 2400 display to agree exactly with the actual DMM reading Use the up and down arrow keys to select the digit value and use the left and right arrow keys to choose the digit position Note that the display adjustment range is within 10 of the present range After adjusting the display to agree with the DMM reading press ENTER The instru ment will then display the following V CAL Press ENTER to Output 000 00mV Press ENTER The Model 2400 will source OmV and at the same time display the following DMM RDG 000 0000mV Use gt V ENTER or EXIT Note and record the DMM reading and then adjust the Model 2400 di
10. pable of withstanding the voltage being measured The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the equipment may be impaired Do not exceed the maximum signal levels of the instruments and accessories as defined in the specifications and operating information and as shown on the instrument or test fixture panels or switching card When fuses are used in a product replace with same type and rating for continued protection against fire hazard Chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections If you are using a test fixture keep the lid closed while power is applied to the device under test Safe operation requires the use of a lid interlock Ifa screw is present connect it to safety earth ground using the wire recommended in the user documen tation The symbol an instrument indicates that the user should refer to the operating instructions located the manual The A symbol on an instrument shows that it can source or measure 1000 volts or more including the com bined effect of normal and common mode voltages Use standard safety precautions to avoid personal contact with these voltages The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicat
11. 5 2 62 Remote calibration command summary 2 MD power components Power module removal Power supply removal Repair considerations Replaceable Parts Requesting calibration constants Resetting the calibration password 2 6 Resistance measurement accuracy Restoring factory defaults 1 4 Routine Maintenance Line fuse replacemeni3 2 Line powe Measure accuracy Mechanical parts list Miscellaneous command Setting the measurement range 1 6 Setting the source range and output value Software requirements C 2 Source accuracy Specifications No comm link error Static sensitive deviced 5 3 Ohms measurement accuracy limits 1 14 Test considerations Ordering information 6 2 Test summary Output current accuracy limits Troubleshooting 4 1 4 10 s 1 4 Output voltage accuracy 1 8 Output voltage accuracy limits 1 9 Analog circuitry checks 4 11 Digital circuitry checks Display board checks Power supply checks 4 10 Parts lists 6 2 Performance Verification U Performing the verification test procedures Unlocking calibration 2 4 Power line fuse by remote Power supply checks from the front panel 2 4 Power on self tes Principles of operation 4 4 Analog circuits 4 4 Source circuits Verification 1 2 Digital circuitry 4 7 Verification test requirements 1 2 Display board circuits 4 8 Viewing calibration dates a
12. 9E 6 to 6 9E 6 to 11E 6 100pA 1E 6 to 1E 6 90E 6 to 110E 6 90E 6 to 110E 6 ImA 1 5 to IE 5 0 9E 3 to 1 1E 3 0 9E 3 to 1 1E 3 10mA 1E 4 to IE 4 9E 3 to 3 9E 3 to 11E 3 100mA 1 3 to 1E 3 90E 3 to 110E 3 90E 3 to 110E 3 1A 1 2 to 1 2 0 9 to 1 1 0 9 to Command Reference B 7 SO U RCE CALibration PRO Tected SO U Rce Purpose To calibrate the source function Format cal prot sour lt nrf gt Parameter See Table B 3 D escription The CAL PROT SOUR command calibrates the Model 2400 source func tion To use this command you must 1 program the source to the correct value 2 select the range being calibrated and 3 send the CAL PROT SOUR command for each parameter listed in Table B 3 Note When the Model 2400 receives this command it will attempt to place the parameter into one of the four parameter ranges summarized in Table B 3 depending on the active SOUR FUNC and range If the parameter does not fit into any of the four allowed ranges an error number 222 Parameter data out of range will be generated Once the unit has successfully selected the appropriate parameter range it will then check to see if the active source is programmed to a value within the selected parameter range and that OUTP STAT is ON If the active source is not programmed to a value within the parameter range or if the source is in autorange or in standby an error number 221 Set
13. Adjust its position by gently pulling it away from the sides of the instrument case and swinging it up or down To remove the handle swing the handle below the bottom surface of the case and back until the orientation arrows on the handles line up with the orientation arrows on the mounting ears With the arrows lined up pull the ends of the handle away from the case 2 Remove Mounting Ears Remove the screw that secures each mounting ear Pull down and out on each mounting ear NOTE When reinstalling the mounting ears be 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 RemoveRear Bezel To remove the rear bezel loosen the two screws that secure the rear bezel to the chassis and then pull the bezel away from the case 4 Removing Grounding Screws Remove the two grounding screws that secure the case to the chassis They are located on the bottom of the case at the back 5 RemoveChassis To remove the case grasp the front bezel of the instrument and carefully slide the chassis forward Slide the chassis out of the metal case NOTE To gain access to the components under the analog board shield remove the shield which is secured to the analog board by a single screw Analog board removal Perform the following steps to remove the analog board This procedure assumes that the case cover is already
14. MAX OUTPUT POWER 22W four quadrant source or sink operation SOURCE SINK LIMITS 21V 9 1 05 2210V 105mA VOLTAGE REGULATION Line 0 01 of range Load 0 01 of range 100uV NOISE 10Hz 1MHz 10mV typical Resistive load OVER VOLTAGE PROTECTION User selectable values 5 tolerance Factory default 40 volts CURRENT LIMIT Bipolar current limit compliance set with single value Min 0 1 of range OVERSHOOT lt 0 1 typical full scale step resistive load 10mA range Current Programming Accuracy local or remote sense Accuracy 1 Year Noise Programming 23 C 45 C peak peak Range Resolution rdg amps 0 1Hz 10Hz 1 00000 uA 50 pA 0 03596 600pA 5pA 10 0000 uA 500 pA 0 033 2nA 50 pA 100 000 uA 5nA 0 031 20nA 500 pA 1 00000 mA 50nA 0 034 200nA 5nA 10 0000 mA 500 nA 0 045 24 100 000 mA 5 pA 0 066 200A 1 00000 4 50 yA 0 27 96 900 TEMPERATURE COEFFICIENT 0 18 C 28 50 C 0 15 x accuracy specification C MAX OUTPUT POWER 22W four quadrant source or sink operation SOURCE SINK LIMITS 105mA 9 210V 1 05A 9 21V CURRENT REGULATION Line 0 01 of range Load 0 01 of range 100pA VOLTAGE LIMIT Bipolar voltage limit compliance set with single value Min 0 1 of range OVERSHOOT lt 0 1 typical 1mA step R 10kQ 20V range 1 Specifications valid for continuous output currents below 105mA For operating above 105mA continuous for gt 1 minute der at
15. Press MEAS 2 to select the ohms measurement function and make sure the source out put is turned on 5 Verify ohms measurement accuracy for each of the resistance values listed in Table 1 6 For each measurement Set the resistance calibrator output to the nominal resistance or closest available value NOTE may not be possible to set the resistance calibrator to the specified value Use the closest possible setting and modify reading limits accordingly Select the appropriate ohms measurement range with the RANGE keys Verify that the Model 2400 resistance reading is within the limits given in the table 6 Repeat the entire procedure using the rear panel INPUT OUTPUT and 4 WIRE SENSE jacks Be sure to select the rear panel jacks with the front panel TERMINALS key Table 1 6 Ohms measurement accuracy limits Calibrator Model 2400 resistance reading limits Model 2400 range resistance 1 year 18 28 C 200 190 18 9784 to 19 0216Q 2002 190Q 189 824 to 190 176Q 2kQ 1 9kQ 1 89845 to 1 90155kQ 20kQ 19kQ 18 9850 to 19 0150kQ 200kQ 190kQ 189 847 to 190 153kQ 2MQ 1 9MQ 1 89761 to 1 90239MQ 20MQ 19MQ 18 9781 to 19 0219MQ 200 0 100MQ 99 020 to 100 980MQ Nominal resistance value Reading limits based on Model 2400 normal accuracy specifications and nominal resistance values If actual resistance values differ from nominal values shown recalculate reading limits using actual calibrator resistance
16. Rest House Crescent Bangalore 560 001 91 80 509 1320 21 Fax 91 80 509 1322 Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 2FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 130 822 574 7778 Fax 82 2 574 7838 Postbus 559 NL 4200 AN Gorinchem 0183 635333 Fax 0183 630821 Kriesbachstrasse 4 8600 D bendorf 01 821 94 44 Fax 01 820 30 81 1FL 85 Po Ai Street Hsinchu Taiwan R O C 886 3 572 9077 Fax 886 3 572 9031 No 2193 2 2000
17. Select UNLOCK and then press ENTER The instrument will display the following PASSWORD Use lt gt A V ENTER or EXIT Use the up and down RANGE keys to select the letter or number and use the left and right arrow keys to choose the position Press down RANGE for letters up RANGE for numbers Enter the current password on the display Front panel default 002400 Calibration 2 5 4 Once the correct password is displayed press the ENTER key If the password was cor rectly entered the following message will be displayed CALIBRATION UNLOCKED Calibration can now be executed 5 Press EXIT to return to normal display Calibration will be unlocked and assume the states summarized in Table 2 2 Attempts to change any of the settings listed below with calibration unlocked will result in an error 510 Not permitted with cal un locked NOTE With calibration unlocked the sense function and range track the source function and range That is when SOUR FUNC is set to VOLT the SENS FUNC setting will be VOLT DC When SOUR FUNC is set to CURR the SENS FUNC setting will be CURR DC A similar command coupling exists for SOUR VOLT RANG SENS VOLT RANG and SOUR CURR RANG SENS CURR RANG Table 2 2 Calibration unlocked states Mode State Equivalent remote command Concurrent Functions OFF SENS FUNC CONC OFF Sense Function Source SENS FUNC source function Sense Vol
18. you will receive these parts in anti static containers made of plastic or foam Keep these devices in their original containers until ready for installation Remove the devices from their 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 into which a semiconductor device is to be inserted to the bench or table Use only anti static type desoldering tools Use only grounded tip solder irons Once the device is installed in the PC board it is normally adequately protected and you can handle the boards normally Assembly drawings Use the assembly drawings located at the end of this section to assist you as you disassemble and reassemble the Model 2400 Also refer to these drawings for information about the Kei thley part numbers of most mechanical parts in the unit Front panel assembly 2400 040 Analog board heat sink shield assembly 2400 050 Chassis assembly 2400 051 Chassis analog board assembly 2400 052 Final chassis assembly 2400 053 5 4 Disassembly Case cover removal Follow the steps below to remove the case cover to gain access to internal parts WARNING Before removing the case cover disconnect the line cord and any test leads from the instrument 1 Remove Handle The handle serves as an adjustable tilt bail
19. 500 uV 200 000 V 5 mv 0 02 24mV 5mv TEMPERATURE COEFFICIENT 0 18 C 28 50 C 40 15 x accuracy specification C MAX OUTPUT POWER 22W four quadrant source or sink operation SOURCE SINK LIMITS 21V 9 1 05 2210V 105mA VOLTAGE REGULATION Line 0 01 of range Load 0 01 of range 100uV NOISE 10Hz 1MHz 10mV typical Resistive load OVER VOLTAGE PROTECTION User selectable values 5 tolerance Factory default 40 volts CURRENT LIMIT Bipolar current limit compliance set with single value Min 0 1 of range OVERSHOOT lt 0 1 typical full scale step resistive load 10mA range Current Programming Accuracy local or remote sense Accuracy 1 Year Noise Programming 23 C 45 C peak peak Range Resolution rdg amps 0 1Hz 10Hz 1 00000 uA 50 pA 0 03596 600pA 5pA 10 0000 uA 500 pA 0 033 2nA 50 pA 100 000 uA 5nA 0 031 20nA 500 pA 1 00000 mA 50nA 0 034 200nA 5nA 10 0000 mA 500 nA 0 045 24 100 000 mA 5 pA 0 066 200A 1 00000 4 50 yA 0 27 96 900 TEMPERATURE COEFFICIENT 0 18 C 28 50 C 0 15 x accuracy specification C MAX OUTPUT POWER 22W four quadrant source or sink operation SOURCE SINK LIMITS 105mA 9 210V 1 05A 9 21V CURRENT REGULATION Line 0 01 of range Load 0 01 of range 100pA VOLTAGE LIMIT Bipolar voltage limit compliance set with single value Min 0 1 of range OVERSHOOT lt 0 1 typical 1mA step R 10kQ 20V range
20. AD711JR IC 894 U607 IC OP AMP NE5534D IC 802 Table 6 1 cont Analog board parts list Replaceable Parts 6 9 Keithley Circuit designation Description part no U608 IC VOLT COMPARATOR LM311M IC 776 U224 602 603 651 IC QUAD 2 IN NOR 74 02 IC 809 U660 661 IC 16 BIT DAC AD7849BR IC 1004 VR200 201 DIODE ZENER 11V MMSZ11T1 DZ 103 VR214 215 DIODE ZENER 8 2V MMBZ5237 DZ 92 VR216 217 DIODE ZENER 17V MMBZ5247BL DZ 104 VR400 401 DIODE ZENER 4 7V IN4732A DZ 67 VR403 601 604 DIODE ZENER 3 3V MMBZ5226BL DZ 94 VR404 406 DIODE ZENER 5 1V BZX84C5V1 DZ 88 VR500 501 DIODE ZENER 6 0V BZX84B6V2 DZ 87 VR600 DIODE ZENER 6 4V IN4579 DZ 73 VR602 603 DIODE ZENER 6 2V MMSZ6V2 DZ 97 W401 JUMPER J 15 Y600 OSCILLATOR HIGH SPEED CMOS 12MHZ CR 37 6 10 Replaceable Parts Table 6 2 Digital board parts list K eithley Circuit designation Description part no BATTERY HOLDER BH 34 31 BATTERY LITHIUM MANGANESE CELL BA 44 C1 3 6 9 11 14 16 20 22 23 25 26 30 36 CAP 1UF 10 25V CERAMIC C 495 1 37 39 41 44 46 49 59 66 70 73 76 84 85 C2 56 CAP 01UF 10 50V CERAMIC C 491 01 C4 10 CAP 15P 1 100V CERAMIC C 512 15P C5 CAP 1UF 20 100V CERAMIC C 436 1 C15 28 38 47 60 61 CAP 47P 596 100V CERAMIC C 465 47P C21 27 29 51 72 86 CAP IUF 2096 50V CERAMIC C 519 1 C31 CAP 100PF 5 100V CERAMIC C 465 100P C32 34 63 64 CAP 47UF 20 100V ALUM ELE
21. F2 6 TP8 35V 30VF referenced to Common F2 7 TP9 35V 30VF referenced to Common F2 1018 2 2U8 pin 1 Digital circuitry checks Digital circuit problems can be checked using Table 4 3 See Principles of operation for a digital circuit description Troubleshooting Table 4 3 Digital circuitry checks Step Item component Required condition Remarks 1 Power on test RAM OK ROM OK Verify that RAM and ROM are functional 2 U3 pin 19 Digital common All signals referenced to digital common 3 U3 pin7 5V Digital logic supply 4 U3 pin 68 Low on power up and then goes high MPU RESET line 5 U3 lines 0 19 Check for stuck bits MPU address bus 6 U3 lines DO D15 Check for stuck bits MPU data bus 7 U3 pin 66 16 78MHz MPU clock 8 U4 pin7 Pulse train during RS 232 VO RS 232 RX line 9 U4 pin 8 Pulse train during RS 232 VO RS 232 TX line 10 013 pins 34 42 Pulse train during IEEE 488 VO TEEE 488 data bus 11 UI3 pins 26 31 Pulses during IEEE 488 T O TEEE 488 command lines 12 U13 pin 24 Low with remote enabled TEEE 488 REN line 13 U13 pin 25 Low during interface clear TEEE 488 IFC line 14 U3 pin 43 Pulse train D_ADDATA 15 U3 pin 44 Pulse train D_DATA 16 U3 pin 45 Pulse train D_CLK 17 U3 pin 47 Pulse train D_STB Analog circuitry checks Table 4 4 summarizes analog circuitry checks Table 4 4 Analog circuitry checks Step Item
22. Origin To Mem To GPIB ToGPIB ToGPIB Fast 0 01 internal 2125 2010 1000 1000 1675 1590 900 900 1000 990 760 760 200 185 200 185 0 01 external 1275 1220 910 920 1085 1045 830 835 940 910 710 710 195 180 195 180 Medium 0 10 internal 510 435 510 435 475 410 475 410 400 355 400 355 155 140 155 140 0 10 external 440 380 440 380 415 365 415 365 390 345 390 345 150 135 150 135 Normal 1 00 internal 59 49 59 49 58 48 58 48 57 48 57 48 46 39 46 39 1 00 external 57 48 57 48 57 47 57 47 56 47 56 47 46 39 46 39 SINGLE READING OPERATION READING RATES rdg second FOR 60Hz 50Hz Measure Source Measure Source Measure Pasy Fail gt Speed NPLC Trigger Origin To GPIB To GPIB To GPIB Fast 0 01 internal 200 200 65 65 65 65 Medium 0 10 internal 160 150 60 60 60 58 Normal 1 00 internal 46 40 31 28 30 28 COMPONENT HANDLER INTERFACE TIME 5 Speed NPLC Trigger Origin Measure Pass Fail Test Source Pass Fail Test Source Measure Pass Fail Test Fast 0 01 external 0 96ms 1 07 ms 0 5 ms 0 5 ms 4 0ms 4 0 ms Medium 0 10 external 25ms 2 8ms 0 5 ms 0 5 ms 5 5 ms 5 75 ms Normal 1 00 external 17 5 ms 20 85 ms 0 5ms 0 5 ms 20 5 24ms 1 Reading rates applicable for voltage or current measurements Auto zero off autorange off filter off display off trigger delay 0
23. RAMs used in parallel to utilize the 16 bit data bus of the MPU The RAM is battery backed up pro viding continued storage of data buffer information during power down cycles All calibration constants and system setups are stored in a separate serial EEPROM External communication is provided via GPIB and serial interfaces A 9914 GPIA IEEE 488 standard interface IC is used for the GPIB and a 68332 Queued Serial Module QSM provides the serial UART For internal communications the Time Processing Unit TPU is used for serial communications with the front panel display module and both the TPU and QSM handle digital to analog interfacing Display board Display board components are shown in the digital circuitry block diagram in Figure 4 4 U902 is the display microcontroller that controls the VFD vacuum fluorescent display and interprets key data The microcontroller has four peripheral I O ports that are used for the vari ous control and read functions Display data is serially transmitted to the microcontroller from the digital board via the TXB line to the microcontroller PDO terminal In a similar manner key data is serially sent back to the digital board through the RXB line via PD1 The 4MHz clock for the microcontroller is generated on the digital board Troubleshooting 4 9 Figure 4 4 Digital b
24. Range Range 10 LOOP WHILE Range lt 200 PRINT 1 OUTPUT 24 CAL PROT LOCK PRINT 1 OUTPUT PRINT 41 OUTPUT 24 SOUR FUNC CURR PRINT 41 OUTPUT Range 00000 l 24 CAL PROT CODE KI002400 Initial range 1pA PRINT PRI DO PR LOOP WHILE PRINT 1 OUTPUT 24 CAL PROT LOCK T DATAS Range lt T Model 24 PRINT 1 OUTP PRINT 1 OUTP PRINT 41 ENTE LINE INPUT 42 PRINT Data PRINT 1 OUTP PRINT 41 ENTE LINE INPUT 42 1 R 24 Data R 24 Data Range Range 10 PRINT 1 OUTPUT 24 RST PRINT 41 END LOCAL 24 Calibration Programs 00 Current Calibration Constants PRINT Loop for all current ranges UT 24 SOUR CURR RANGE Range UT 24 CAL PROT SENS DATA UT 24 CAL PROT SOUR DATA Lock out calibration C 7 C 8 Calibration Programs Index A D converter 4 8 Accuracy calculations A 10 Active guard 4 8 Analog board parts list 6 4 Analog board remova Analog circuitry checks Assembly drawings Block diagram Analog circuitry Digital circuitr Power supply Calibration Calibration considerations Calibration cycle Recommended calibration equipment 2 4 Resistor characterization 2 4 Calibration equipment C 2 Calibration errors Front panel error reporting Remote error re porting Calibration Programs Case cover removal Changing the password by
25. SOURCE I key to source current and make sure the source out put is turned on Figure 1 2 Current verifi cation connections MEAS T SOURCE 1 au 00000000 E GED mea Gir Cr POWER 5 i 8 3 RANGE 9 O 2 Model 2400 Input LO Amps Digital Multimeter 1 12 Performance Verification 4 Verify output current accuracy for each of the currents listed in Table 1 4 For each test point Select the correct source range Set the Model 2400 output current to the correct value Verify that the multimeter reading is within the limits given in the table 5 Repeat the procedure for negative output currents 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 TERMINALS key Table 1 4 Output current accuracy limits Model 2400 Model 2400 output Output current limits source range current setting 1 year 18 C 28 C 1 000001 A 0 99905 to 1 00095 10uA 10 0000uA 9 9947 to 10 0053 100uA 100 000uA 99 949 to 100 051 ImA 1 00000mA 0 99946 to 1 00054mA 10mA 10 0000mA 9 9935 to 10 0065mA 100mA 100 000mA 99 914 to 100 086mA 1A 1 00000A 0 99640 to 1 00360A Current measurement accuracy Follow the steps below to verify th
26. T N DUE year month day N ext calibration due date Note that the year month and day must be separated by commas The allowable range for the year is from 1995 to 2094 the month is from 1 to 12 and the day is from 1 to 31 Step 5 Save calibration constants Calibration is now complete so you can store the calibration constants in EEROM by sending the following command CAL PRO T SAVE NOTE Calibration will be temporary unless you send the SAVE command Also calibration data will not be saved if 1 calibration is locked 2 invalid data exists or 3 all steps were not completed Step 6 Lock out calibration To lock out further calibration send the following command after completing the calibration procedure CAL PROT LO CK Single range calibration Normally the complete calibration procedure should be performed to ensure that the entire instrument is properly calibrated In some instances however you may want to calibrate only certain ranges To do so simply complete the entire procedure only for the range s to be calibrated Keep in mind however that you must complete all parameter steps for each source or sense range Also be sure to set calibration dates and save calibration after calibrating the desired range s Routine M aintenance 3 2 Routine Maintenance Introduction The information in this section deals with routine type maintenance that can be performed by the operator Line
27. VALUE 0 196 of range CONTACT CHECK 20 150 502 No contact check failure L000 1350 4750 Always contact check failure 23 000 21650 25250 MEASURE SPECIFICATIONS 12 Voltage Measurement Accuracy remote sense Max Input Accuracy 23 C 5 C Range Resolution Resistance 1Year rdg volts 200 000 mV 1 uV gt 10GQ 0 012 300 uV 20000 V 10 uV gt 10GQ 0 012 300 uV 20 0000 V 100 uv gt 10GQ 0 015 1 5 mV 200 000 V 1 gt 10GQ 0 015 10 mV TEMPERATURE COEFFICIENT 0 18 C amp 28 50 C 3 0 15 x accuracy specification C Current Measurement Accuracy local or remote sense Max Voltage Accuracy 23 C 5 C Range Resolution Burden 1Year rdg amps 1 00000 pA 10pA lt 1mV 0 029 300 pA 10 0000 uA 100 pA lt 1mV 0 027 700 pA 100 000 uA 1nA lt 1mV 0 025 6nA 1 00000 mA 10nA lt 1mV 0 027 60 nA 10 0000mA 100 lt 1mV 0 035 600 nA 100 000 mA 1 lt 1 0 055 6pA 1 00000 4 10 pA lt 1mV 0 22 96 570 pA TEMPERATURE COEFFICIENT 0 18 C amp 28 50 C 40 1 x accuracy specification C Resistance Measurement Accuracy 4 wire remote sense Sourcel Mode Auto Ohms Max Default Normal Accuracy 23 C 5 C Enhanced Accuracy 23 C 5 C 5 Range Resolution Test Current 1Year H rdg ohms 1 Year H rdg ohms lt 2 00000 0 1 HQ Source lacc Measure V cc Measure lacc Measure V cc 200000 Q 100 100 mA 0 0989640 003 Q 0 073 0 001 200 000 Q 1mo 10 mA
28. and binary reading format Purely resistive load 10 and 10pA ranges lt 65ms 1000 point sweep was characterized with the source on a fixed range Pass Fail test performed using one high limit and one low math limit 5 ncludestimeto re program source to a new level before making measurement Timefrom falling edge of START OF TEST signal to falling edge of END OF TEST signal 7 Command processing time of SOU Rce VOLTage CU RRent TRI Ggered nrf2 command not included Specifications A 5 2400 SPECIFICATIONS cont GENERAL NOISE REJECTION NPLC NMRR CMRR Fast 0 01 80 dB Medium 0 1 80 dB Normal 1 60 dB 120 dB LOAD IMPEDANCE Stable into 20 000pF typical COMMON MODE VOLTAGE 250VDC COMMON MODE ISOLATION gt 10 Q lt LOOOpF OVERRANGE 10596 of range source and measure MAX VOLTAGE DROP BETWEEN INPUT OUTPUT AND SENSE TERMINALS 5 volts MAX SENSE LEAD RESISTANCE 1M for rated accuracy SENSE INPUT IMPEDANCE gt 102 Q GUARD OFFSET VOLTAGE 300 typical SOURCE OUTPUT MODES Fixed DC level Memory List mixed function Stair linear and log SOURCE MEMORY LIST 100 points max MEMORY BUFFER 5 000 readings 5 digits two 2 500 point buffers Includes selected measured value s and time stamp Lithium battery backup 3 yr battery life PROGRAMMABILITY EEE 488 SCPI 1995 0 RS 232 5 user definable power up states plus factory default and RST DIGITAL INTERFACE Safety Interl
29. by password CODE lt password gt Unlock cal If cal is unlocked changes password Default password K1002400 COUNT Query number of times 2400 has been calibrated SAVE Save calibration data to EEPROM LOCK Lock calibration inhibit SAVE command operation LOCK Request cal lock status 0 unlocked locked DATE lt y gt lt m gt lt d gt Program calibration year month day DATE Query calibration year month day NDUE lt y gt lt m gt lt d gt Program calibration due year month day NDUE Query calibration due year month day SENSe lt nrf gt Calibrate active measure range DATA Query measurement cal constants for active range SOURce lt nrf gt Calibrate active source range DATA Query source cal constants for active range Calibration data will not be saved if 1 Calibration was not unlocked with CODE command 2 Invalid data exists For example cal step failed or was aborted 3 Incomplete number of cal steps was performed For example omitting a negative full scale step Command Reference B 3 Miscellaneous commands Miscellaneous commands are those commands that perform such functions as saving calibration constants locking out calibration and programming date parameters CODE CALibration PRO Tected CO D E Purpose To unlock calibration so that you can perform the calibration procedures Format cal prot code password Parameter Up to an 8 characte
30. circuitry block diagram Analog circuits Figure 4 1 shows the overall block diagram for the Model 2400 D A converters control the programmed voltage and current or voltage compliance and current compliance Each DAC has two ranges a 10V output or a 1V output The DAC outputs are fed to the summing node FB Either the V DAC or the I DAC has the ability to control the main loop If the unit is set for SV source voltage it will source voltage until the compliance cur rent is reached as determined by the I DAC setting and the current loop will override the volt age loop If however the unit is set for SI source current it will source current until the compliance voltage is reached as determined by the V DAC setting and the voltage loop will override the current loop A priority 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 output stage which provides the necessary voltage and current gain to drive the output Sense resistors in the HI output lead provide output current sensing and a separate sense resistor is used for each current range The 1A range uses 0 2V full scale for a full range 1A output while all other ranges use 2V output for full scale current Voltage feedback is routed either internally or externally Figure 4 1 Troubleshooting 4 5 There are four voltage r
31. component Required condition Bench defaults Remarks 1 TP200 gt 200V voltage protection 13 XIV 2 TP201 SOURCE 10V 5V 5 3 TP202 SOURCE 10V SVMD 10V 1V 4 TP203 SOURCE 10V 10 5 x1V 5 TP213 SOURCE 10V OV 1V 6 TP218 OUTPUT COM TV 7 219 OUTPUT TV 7V 8 214 SVMI OUTPUT ON 20V on 20V RANGE 20 5V 9 TP232 Bench defaults 6 4V 6V Measured with respect to OUTPUT COM TP501 4 11 4 12 Troubleshooting Battery replacement WARNING Disconnect the instrument from the power line and all other equipment before changing the battery The volatile memories of the Model 2400 are protected by a replaceable battery when power is off Typical life for the battery is approximately ten years The battery should be suspected if the instrument no longer retains buffer data or user defined operating parameters such as instrument setups source memory and math expressions If the battery is absent or totally exhausted the display will show the Reading buffer data lost message shortly after the Model 2400 is switched on The battery is a 3V wafer type lithium cell Duracell type DL2450 or equivalent Keithley part number BA 44 which is located on the digital board Replacement of the battery requires removal of the case cover analog shield and analog board assembly See Section 5 WARNING danger of explosion if battery is incorrectly replaced Replace
32. for the various circuits is summarized in the following paragraphs Display board checks If the front panel display tests indicate that there is a problem on the display board use Table 4 1 See Principles of operation for display circuit theory Table 4 1 Display board checks Step Item component Required condition Remarks 1 Front panel test Verify that all segments operate Use front panel display test 2 P1005 pin 5 5 5 Digital 5V supply 3 P1005 pin 9 37V 5 Display 37V supply 4 U902 pin 1 Goes low briefly on power up and then goes high Microcontroller RESET 5 0902 pin 43 4MHz square wave Controller 4MHz clock 6 U902 pin 32 Pulse train every 1 ms Control from main processor 7 1902 pin 33 Brief pulse train when front panel key is pressed Key down data sent to main processor Power supply checks Power supply problems can be checked using Table 4 2 See Principles of operation for cir cuit theory on the power supply Note that the power supply circuits are located on the digital board Table 4 2 Power supply checks Step Item component Required condition Remarks 1 Line fuse Check continuity Remove to check 2 Line power Plugged into live receptacle power on Check for correct power up sequence 3 TP5 5 5 5VF referenced to Common 1331 4 TP6 15V 5 15VF referenced to Common 122 5 TP7 15V 5 15VF referenced to Common
33. fuse replacement WARNING Disconnect the line cord at the rear panel and remove all test leads con nected to the instrument front and rear before replacing the line fuse The power line fuse is accessible from the rear panel just above the AC power receptacle see Figure 3 1 Perform the following steps to replace the line fuse 1 Carefully grasp and squeeze together the locking tabs that secure the fuse carrier to the fuse holder 2 Pull out the fuse carrier and replace the fuse with the type specified in Table 3 1 CAUTION prevent instrument damage use only the fuse type specified in Table 3 1 3 Reinstall the fuse carrier NOTE Ifthe power line fuse continues to blow a circuit malfunction exists and must be corrected Refer to the troubleshooting section of this manual for additional information Table 3 1 Power line fuse Line voltage Rating K eithley part no 88 264V 250V 1A slow blow 5 x 20mm FU 72 Routine Maintenance 3 3 Figure 3 1 Rear panel WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY am PK V Q M IN GUARD aa MADE IN USA LINE FUSE SLOWBLOW 2 5A 250V LINE RATING 85 264 50 60 2 70VA on 4 WIRE INPUT SENSE OUTPUT 2501 IEEE 488 ENTER IEEE ADDRESS WITH FRONT PANEL MENU TRIGGER INTERLOCK LINK DIGITAL CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZA
34. remote Command Reference Command summai Compliance considerations Compliance limits 1 6 Determining compliance ME Maximum compliance values 1 7 Taking the SourceMeter out of compliance Types of compliance Component layouts Computer hardware requirements C 2 Connections Calibration menu voltage calibratio Current accurac Output readback Current measurement accuracy limits Detecting calibration errors B 9 Error summary B 9 Generating an SRQ on error Reading the error queue B 9 Status byte EAV Error Available 2 10 Detecting calibration step completion B 11 Generating an SRQ on calibration en Using the OPC command B 11 Using the OPC query B 11 Digital board parts list Digital board removal 5 6 Digital circuitry 4 8 Digital circuitry checks Disassembly 5 1 Display board checks 4 10 Display board parts list 6 13 Environmental conditions 1 2 2 2 Line power 2 2 Temperature and relative humidit Warm up period 2 2 Factory service 6 3 Front panel calibratio Front panel disassembly Front panel password 2 6 Front panel tests CHAR SET test 4 4 DISPLAY PATTERNS test 4 3 KEYS test 4 3 General program instructions C 3 Program C 1 Model 2510 calibration program C 3 Handling and cleaning 5 2 Handling PC boards Solder repairs 5 2 Instrument reassembly Internal fuse replacement Introduction 1 24 2 24 3 2 42
35. source auto clear off and binary reading format 2 Purely resistive load 1uA and 10pA ranges lt 65ms 3 1000 point sweep was characterized with the source on a fixed range 4 Pass Fail test performed using one high limit and one low math limit 5 Includes time to re program source to a new level before making measurement 6 Time from falling edge of START OF TEST signal to falling edge of END OF TEST signal 7 Command processing time of SOU Rce VOLTage CU RRent TRI Ggered lt nrf gt command not included Specifications A 9 2400 C SPECIFICATIONS cont GENERAL NOISE REJECTION NPLC NMRR CMRR Fast 0 01 80 dB Medium 0 1 80 dB Normal 1 60 dB 120 dB LOAD IMPEDANCE Stable into 20 000pF typical COMMON MODE VOLTAGE 250VDC COMMON MODE ISOLATION gt 10 Q lt LOOOpF OVERRANGE 10596 of range source and measure MAX VOLTAGE DROP BETWEEN INPUT OUTPUT AND SENSE TERMINALS 5 volts MAX SENSE LEAD RESISTANCE 1M for rated accuracy SENSE INPUT IMPEDANCE gt 102 Q GUARD OFFSET VOLTAGE 300 typical SOURCE OUTPUT MODES Fixed DC level Memory List mixed function Stair linear and log SOURCE MEMORY LIST 100 points max MEMORY BUFFER 5 000 readings 5 digits two 2 500 point buffers Includes selected measured value s and time stamp Lithium battery backup 3 yr battery life PROGRAMMABILITY EEE 488 SCPI 1995 0 RS 232 5 user definable power up states plus factory default and RST DI
36. step Calibration 2 17 Table 2 6 CALibration PROT ected SEN Se parameter ranges First parameter Second parameter Third parameter Sense range zero negative full scale positive full scale 0 2V 0 002 to 0 002 0 18 to 0 22 0 18 to 0 22 2V 0 02 to 0 02 1 8 to 2 2 1 8 to 2 2 20V 0 2 to 0 2 18 to 22 18 to 22 200V 2 to 2 180 to 220 180 to 220 1E 8 to 1E 8 0 9E 6 to 1 1E 6 0 9E 6 to 1 1E 6 10uA 1E 7 to 1E 7 9E 6 to 11E 6 9E 6 to 11E 6 100uA 1E 6 to 1E 6 90E 6 to 110E 6 90E 6 to 110E 6 ImA 1E 5 to IE 5 0 9E 3 to 1 1E 3 0 9E 3 to 1 1E 3 10mA 1E 4 to 1E 4 9E 3 to 11E 3 9E 3 to 11E 3 100mA 1E 3 to 1E 3 90E 3 to 110E 3 90E 3 to 110E 3 1A 1E 2 to 1 2 0 9 to 1 1 40 9 to 41 1 NOTE Parameter steps for each range may be performed in any order but all three parameter steps for each range must be completed Table 2 7 CALibration PROT ected SO U Rce parameter ranges First parameter Second parameter Third parameter Fourth parameter Source range negative full scale negative zero positive full scale positive zero 0 2V 0 18 to 0 22 0 002 to 0 002 0 18 to 40 22 0 002 to 0 002 2V 1 8 to 2 2 0 02 to 0 02 1 8 to 2 2 0 02 to 0 02 20V 18 to 22 0 2 to 0 2 18 to 22 0 2 to 0 2 200V 180 to 220 2 to 2 180 to 220 2 to 2 0 9 6 6 1E 8 to 1E 8 0 9E 6 to 1 1E 6 1E 8 to 1E 8 10uA 9E 6 to 11E 6 1E 7 to 1
37. values and Model 2400 normal accuracy specifications See Verification limits earlier in this section for details Performance Verification 1 15 Figure 1 3 Resistance verifi cation connections KEITHLEY 2400 SourceMeter MEAS i SOURCE 1 Y RANGE Ls me 23 425 Km Q ewe gt GD POWER RANGE 9 o Gomes GED a GED Q OUTPUT TERMINALS ON OFF TE M odel 2400 Resistance Calibrator O utput LO Sense LO 1 16 Performance Verification Calibration 2 2 Calibration Introduction Use the procedures in this section to calibrate the Model 2400 These procedures require accurate test equipment to measure precise DC voltages and currents Calibration can be performed either from the front panel or by sending SCPI calibration commands over the IEEE 488 bus or RS 232 port with the aid of a computer WARNING _ Theinformation in this section is intended for qualified service personnel only Do not attempt these procedures unless you are qualified to do so Some of these procedures may expose you to hazardous voltages Environmental conditions Temperature and relative humidity Conduct the calibration procedures at an ambient temperature of 18 28 C 65 82 F with relative humidity of less than 70 unless otherwise noted Warm up period Allow the Model 2400 to warm up for at least one hour befo
38. 0 077 0 03 Q 0 053 0 01 0 2 00000 kQ 10 1mA 0 066 0 3 Q 0 045 010 20 0000 kQ 100 mQ 100 0 063 0 048 10 200 000 kQ 1 Q 10 pA 0 065 30 Q 0 046 10 Q 2 00000 M 10 1 pA 0 1196 300 0 0 04996 100 Q 20 0000 M 100 Q 1 pA 0 11 1kQ 0 052 500 Q 200 000 M Q 1 100 0 655 10 0 349 5000 gt 200 000M 04 1MQ Source lacc Measure V cc Measure lacc Measure V cc TEMPERATURE COEFFICIENT 0 18 C 28 50 C 0 15 x accuracy specification C SOURCE I MODE MANUAL OHMS Total uncertainty source accuracy V measure accuracy 4 wire remote sense SOURCE V MODE Total uncertainty V source accuracy 1 measure accuracy 4 wire remote sense A 8 Specifications 2400 C SPECIFICATIONS cont 6 WIRE OHMS MODE Available using active ohms guard and guard sense Max Guard Output Current 50 mA except 1A range Accuracy is load dependent Refer to manual for calculation formula GUARD OUTPUT IMPEDANCE 0 10 in ohms mode 1 Normal 1 PLC Accuracies apply to 2 or 4 wire mode when properly zeroed 34 wire mode 4Manual ohms mode only 5Source readback enabled offset compensation ON SYSTEM SPEEDS MEASUREMENT MAXIMUM RANGE CHANGE RATE 75 second MAXIMUM MEASURE AUTORANGE TIME 40ms fixed source SWEEP OPERATION READING RATES rdg second FOR 60Hz 50Hz Source Measure NPLC Trigger Measure Source Measure Pass Fail Test Source Memory Speed
39. 0kO load 10Hz to 1MHz BW adjacent ranges Smooth Mode 100mV typical except 20V 200V range boundary MINIMUM COMPLIANCE VALUE 0 196 of range MEASURE SPECIFICATIONS 12 Voltage Measurement Accuracy remote sense Max Input Accuracy 23 C x 5 C Range Resolution Resistance 1Year rdg volts 200 000 mV 1 uv gt 10GO 0 012 300 pV 2 00000 V 10 uV gt 10GO 0 012 300 pV 20 0000 V 100 pV gt 10GQ 0 015 1 5 mV 200 000 V 1 gt 10GQ 0 015 10 mV TEMPERATURE COEFFICIENT 0 18 C amp 28 50 C 0 15 x accuracy specification C Current Measurement Accuracy local or remote sense Max Voltage Accuracy 23 C 5 C Range Resolution Burden 1Year H rdg amps 1 00000 uA 10pA lt 1mV 0 029 300 pA 10 0000 uA 100 pA lt 1mV 0 027 700 pA 100 000 uA 1nA lt 1mV 0 025 6nA 1 00000 mA 10nA lt 1mV 0 027 60 nA 10 0000mA 100nA lt 1mV 0 035 600 nA 100 000 mA 1 lt 1mV 0 055 6pA 1 00000 4 10 pA lt 1mV 0 22 96 570 pA TEMPERATURE COEFFICIENT 0 18 C amp 28 50 C 40 1 x accuracy specification C Resistance Measurement Accuracy 4 wire remote sense Source Mode Auto Ohms Max Default Normal Accuracy 23 C 5 C Enhanced Accuracy 23 C 5 C 5 Range Resolution Test Current 1Year 4 rdg ohms 1 Year H rdg ohms lt 2 00000 0 1 HQ Source lacc Measure V cc Measure I acc Measure V cc 200000 Q 100 100 mA 0 098 0 003 Q 0 073 0 001 200 000 Q 1mo 10 mA 0 0
40. 100K 1 100MW THICK FILM R 418 100K 293 296 338 364 402 404 416 417 459 488 R205 210 RES 768 1 100MW THICK FILM R 418 768 R207 RES 8 87K 1 100MW THICK FILM R 418 8 87K R209 211 268 271 RES IM 1 100MW THICK FILM R 418 1M R212 RES 332 1 100MW THICK FILM R 418 332 R213 RES NET 5K 1 668A TF 243 5K R205 214 215 290 485 486 RES 0499 1 100MW THICK FILM R 418 0499 R216 221 223 274 279 289 303 RES 20K 1 100MW THICK FILM R 418 20K R217 RES 121K 1 100MW THICK FILM R 418 121K R218 RES 80 6K 1 100MW THICK FILM R 418 80 6K R219 220 222 230 231 345 373 482 483 RES 49 9K 1 100MW THICK FILM R 418 49 9K R224 229 234 237 244 247 281 282 284 286 RES 10K 1 100MW THICK FILM R 418 10K 288 301 617 622 654 655 R240 243 248 251 253 254 257 258 261 262 RES 4 99K 1 100MW THICK FILM R 418 4 99K 265 266 313 314 317 357 366 601 608 626 R241 242 249 250 653 664 RES 140K 1 100MW THICK FILM R 418 140K R272 273 RES 249K 1 100MW THICK FILM R 418 249K R280 RES 4 02K 1 100MW THICK FILM R 418 4 02K R283 287 297 299 349 350 352 457 461 RES 30 1K 1 100MW THICK FILM R 418 30 1K R291 RES 45 3K 1 100MW THICK FILM R 418 45 3K R292 544 547 RES 100K 1 100MW THICK FILM R 418 100K R298 300 RES 150K 1 100MW THICK FILM R 418 150K R302 310 375 376 RES 0499 1 100MW THICK FILM R 418 0499 R304 306 548 RES 33 5 250MW METAL FILM R 376 33 R307 388 393 399 411 412 413 RES 357 1 100MW THIC
41. 10PF 10 1000V CERAMIC C 64 10P C544 547 CAP 2200P 10 500V CERAMIC C 497 2200P C610 612 CAP 2200P 10 100V CERAMIC C 430 2200P C616 CAP 22UF 20 25V TANTALUM C 440 22 CR200 203 205 207 208 210 212 213 216 DIODE SWITCHING MMBD914 RF 83 221 235 236 602 CR204 206 209 211 222 225 230 233 400 DIODE IN3595 RF 43 401 502 504 CR236 602 212 213 ULTRAFAST POWER RECTIFIER RF 105 CR237 DIODE DUAL SWITCHING BAV99L RF 82 Replaceable Parts 6 5 Table 6 1 cont Analog board parts list K eithley Circuit designation Description part no CR500 503 ULTRAFAST POWER RECTIFIER RF 107 CR508 511 520 521 DIODE CONTROLLED AVALANCHE RF 91 BYD17GSO CR512 513 DIODE ZENER 12V MMSZ11T1 DZ 112 CR517 519 ULTRAFAST POWER RECTIFIER RF 106 CR600 238 DIODE DUAL HSM 2822T31 RF 95 CR601 DIODE SCHOTTKY BAT42 RF 78 J1001 CONN HEADER STRAIGHT SOLDER PIN CS 368 10 J1002 CONN HEADER STRAIGHT SOLDER PIN CS 368 16 J1003 CONN HEADER STRAIGHT SOLDER PIN CS 368 14 J1034 LATCHING HEADER FRICTON SGL ROW CS 724 3 K200 205 N C RELAY 1 FORMB AQV214S RL 176 K206 RELAY REED HI VOLT ISOLATION RL 152 K207 208 RELAY MINI SIGNAL REL RL 163 K211 RELAY SURFACE MOUNT RL 188 L201 COIL CH 72 1 L600 601 602 FERRITE CHIP 600 OHM BLM32A07 CH 62 L603 FERRITE CHIP 600 OHM BLM32A07 CH 62 Q200 207 240 241 TRANS N CHANNEL JFET SNJ132199 TG 294 Q208 210 212 214 216 218 TRANS NPN CATV SILICON MPSH17 TG 221 Q209 211 213 215 217 219
42. 15 96 Use lt gt V ENTER or EXIT 7 Setthe calibration due date to the desired value and then press ENTER Press ENTER again to confirm the date 8 Once the calibration dates are entered calibration is complete The following message will be displayed CALIBRATION COMPLETE Press ENTER to confirm EXIT to abort 9 Press ENTER to save the calibration data or press EXIT to abort without saving cali bration data The following message will be displayed CALIBRATION SU CCESS Press ENTER or EXIT to continue 10 Press ENTER or EXIT to complete process Step 5 Lock out calibration 1 From normal display press MENU 2 Select CAL and then press ENTER The Model 2400 will display the following CALIBRATION UNLOCK EXECUTE VIEW D ATES gt SAVE LOCK CHANGE PASSW ORD 3 Select LOCK and then press ENTER The instrument will display the following CALIBRATION LOCKED Press ENTER or EXIT to continue 4 Press ENTER or EXIT to return to normal display 2 16 Calibration Remote calibration Use the following procedure to perform remote calibration by sending SCPI commands over the IEEE 488 bus or RS 232 port The remote commands and appropriate parameters are separately summarized for each step Remote calibration commands Table 2 5 summarizes remote calibration commands while Table 2 6 and Table 2 7 list command parameter limits Note that each sense range requires three parameters zero negative full scale a
43. 18 C 28 C 0 95000uA 0 94942 to 0 95058uA 10uA 9 5000u A 9 4967 to 9 5033uA 100uA 95 000uA 94 970 to 95 030uA ImA 0 95000mA 0 94968 to 0 95032mA 10mA 9 5000mA 9 4961 to 9 5039mA 100mA 95 000mA 94 042 to 95 058mA 1A 0 95000A 0 94734 to 0 95266A Measure range coupled to source range when simultaneously sourcing and measuring current As measured by precision digital multimeter Use closest possible value and modify reading limits accordingly if necessary Resistance measurement accuracy Follow the steps below to verify that Model 2400 resistance measurement accuracy is within specified limits This procedure involves applying accurate resistances from a resistance calibrator and then verifying that Model 2400 resistance measurements are within required limits 1 With the power off connect the resistance calibrator to the Model 2400 INPUT OUT PUT and 4 WIRE SENSE jacks as shown in Figure 1 3 Be sure to use the four wire connections as shown Select the resistance calibrator external sense mode 3 Configure the Model 2400 ohms function for the 4 wire sense mode as follows Press CONFIG then MEAS Q The instrument will display the following CONFIG OHMS SOURCE SENSE MODE GUARD Select SENSE MODE and then press ENTER The following will be displayed SENSE MODE 2 WIRE 4 WIRE Select 4 WIRE and then press ENTER Press EXIT to return to normal display 1 14 Performance Verification 4
44. 1E 6 1mA 0 9E 3 to 1 1E 3 1E 5 to 1E 5 0 9E 3 to 1 1E 3 1E 5 to 1E 5 10mA 9E 3 to 11E 3 1E 4 to 1E 4 9E 3 to 11E 3 1E 4 to 1E 4 100mA 90E 3 to 110E 3 1E 3 to 1E 3 90E 3 to 110E 3 1E 3 to 1E 3 1A 0 9 to 1 1 1E 2 to 1E 2 0 9 to 1 1 1E 2 to 1E 2 DATA CALibration PRO Tected SEN Se D ATA CALibration PRO Tected SO U Rce D ATA Purpose Format Response Description Note Example To request the calibration constants for the active range ical sprotisens data cal prot sour data Four comma separated ASCII floating point constants The CAL PROT SENS DATA and CAL PROT SOUR DATA queries request the calibration constants for the active range of the sense and source functions respectively The four returned constants are in ASCII floating point format delimited by commas To request the appropriate constants 1 select the source or sense function 2 choose the desired range and 3 send the desired DATA query 8 query SENS FUNC SENS VOLT DC RANGE 0 2 CAL PROT SENS DATA VOLT DC Select DC sense function Choose 200mV range Request cal constants Command Reference B 9 D etecting calibration errors If an error occurs during any calibration step the Model 2400 will generate an appropriate error message Several methods to detect calibration errors are discussed in the following paragraphs Reading the error queue As with other Model 2400
45. 4 550 553 608 609 CAP 01UF 10 50V CERAMIC C 491 01 C211 214 CAP 1000PF 10 50 MONO CERAMIC C 452 1000P C215 222 611 CAP 100PF 596 100V CERAMIC C 465 100P C223 224 227 230 233 236 239 240 CAP 33PF 5 100V CERAMIC C 465 33P C241 CAP 1000PF 1 50V CERAMIC C 347 1000P C244 245 CAP 022UF 10 50V CERAMIC C 491 022 C246 513 CAP 560PF 2 5 630V POLYPROPYLENE C 405 560P C247 267 268 1000P 10 100V CERAMIC C 451 1000P C256 257 CAP 22PF 1096 100V CERAMIC C 451 22P C283 CAP 1UF 20 50V CERAMIC C 418 1 C301 302 1000PF 10 50V MONO CERAMIC 452 1000 C311 CAP 100UF 2096 10V ALUM ELEC C 483 100 C312 319 329 CAP 10PF 5 100V CERAMIC C 372 10P C320 323 326 603 604 615 CAP 47P 5 100V CERAMIC C 465 47P C330 CAP 100PF 2 596 630V POLYPROPYLENE C 405 100P C331 334 CAP 100PF 5 100V CERAMIC C 465 100P C296 400 408 CAP 270PF 2 5 630V POLYPROPYLENE C 405 270P C401 402 CAP 10PF 5 500V POLYSTYRENE C 405 10P C405 406 CAP 15UF 20 50V CERAMIC C 418 15 C407 CAP 1UF 20 35V TANTALUM C 494 1 C500 503 CAP 4 7UF 20 350V ALUM ELEC C 393 4 7 C504 505 534 535 CAP 47UF 20 100V ALUM ELEC C 521 47 C512 514 CAP 22PF 10 100V CERAMIC C 451 22P C515 541 CAP 1UF 20 50V CERAMIC C 418 1 C522 523 526 529 532 533 1000P 10 500V CERAMIC C 497 1000P C537 538 CAP 1UF 10 500V X7R C 525 1 C539 540 CAP 1UF 20 50V CERAMIC C 519 1 C543 CAP
46. 536 537 550 551 RES 499 1 100MW THICK FILM R 418 499 R506 509 521 525 526 549 RES 10 10 100MW THICK FILM R 418 10 R516 523 531 RES 4 02K 1 100MW THICK FILM R 418 4 02K R517 524 538 541 RES 12 1 1 125MW METAL FILM R 391 12 1 R542 543 RES 5 5 1W METAL R 444 5 R553 554 RES 2 21K 1 100MW THICK FILM R 418 2 21K R555 RES 8 98K 1 125W THIN FILM R 456 8 98K R556 RES 42 7K 1 125W THIN FILM R 456 42 7K R557 RES 17 2K 1 125W THIN FILM R 456 17 2K R600 370 372 RES 100K 1 100MW THICK FILM R 418 100K R602 607 RES 1 5K 1 100MW THICK FILM R 418 1 5K R609 RES NET TF 245 R610 RES 1 28M 1 1 8W METAL FILM R 176 1 28M R611 621 RES 475 1 100MW THICK FILM R 418 475 R612 RES 5 11K 1 100MW THICK FILM R 418 5 11K R613 624 659 660 RES 100 1 100MW THICK FILM R 418 100 R208 614 615 RES 2 21K 1 100MW THICK FILM R 418 2 21K R618 RES 34K 1 100MW THICK FILM R 418 34K R619 RES 4 75K 1 100MW THICK FILM R 418 4 75K R620 RES 82 5 1 100MW THICK FILM R 418 82 5 R623 RES 10 10 100MW THICK FILM R 418 10 R650 651 RES NET 9K 1K MICRO DIVIDER TF 246 2 R652 665 RES 357 1 100MW THICK FILM R 418 357 R656 RES 10M 1 125MW THICK FILM R 418 10M R657 658 RES IM 1 100MW THICK FILM R 418 1M 6 8 Replaceable Parts Table 6 1 cont Analog board parts list Keithley Circuit designation Description part no R666 RES NET 3K 12K 0 1 100MW THIN T
47. 6 4 7K R905 RES 1M 5 125MW METAL FILM R 375 1M R906 RES 1K 5 250MW METAL FILM R 376 1K R907 RES 240 5 250MW METAL FILM R 376 240 R908 RES 10M 5 250MW METAL FILM R 375 10M T901 TRANSFORMER TDK ER14 5 SERIES TR 300 U901 904 905 IC LATCHED DRIVERS UCN 5812EPF 1 IC 732 U902 PROGRAMMED ROM 7001 800 U903 IC 32 BIT SERIAL UCN 5818EPF 1 IC 830 VR901 DIODE ZENER 8 2V MMBZ5237 DZ 92 Y901 CRYSTAL 4MHZ CR 36 4M Order current firmware revision level 6 14 Replaceable Parts Table 6 4 Mechanical parts list Quantity Description K eithley part no 4 BLACK BANANA JACK BJ 13 0 1 BLUE BANANA JACK BJ 13 6 1 BOTTOM SHIELD 2400 309A 2 FOOT EXTRUDED FE 22A 2 FOOT RUBBER FE 6 1 FUSE 1A SLOW BLOW 5 x 20MM FU 72 1 HANDLE 428 329F 1 HEAT SINK 2400 308A 1 LEFT MOUNTING EAR 428 338B 1 LINE CORD CO 7 1 LINE FILTER LF 11 1 MEMBRANE SWITCH FRONT PANEL 2400 313A 1 POWER ROD 704 313A 1 POWER SUPPLY PS 41A 1 REAR BEZEL 428 303D 4 RED BANANA JACK BJ 13 2 1 RIGHT MOUNTING EAR 428 328E 1 SWITCHPAD 2400 315A 1 TEST LEADS CA 22 1 WHITE BANANA JACK BJ 13 9 Specifications A 2 Specifications 2400 SPECIFICATIONS SOURCE SPECIFICATIONS Voltage Programming Accuracy remote sense Accuracy 1 Year Noise Programming 23 C 45 C peak peak Range Resolution rdg volts 0 1Hz 10Hz 200 000mV 5 0 02 600 uV 5 uv 2 00000 V 50 0 02 600 uV 50 uV 20 0000 V 500 uV 0 02 2 4 mV
48. 77 0 03 Q 0 053 0 01 0 2 00000 kQ 10 mo 1mA 0 066 0 3 Q 0 045 01 Q 20 0000 kQ 100 mQ 100 pA 0 063 30 004336 10 200 000 kQ 1 Q 10 pA 0 065 30 Q 0 046 100 2 00000 M Q 10 1 pA 0 11 300 0 0 049 100 0 20 0000 M Q 100 Q 1 pA 0 11 1kQ 0 052 500 Q 200 000 M 1 100 nA 0 655 10 0 349 5000 gt 200 000M 04 1MQ Source lacc Measure V cc Measure lacc Measure V cc TEMPERATURE COEFFICIENT 0 18 C 28 50 C 0 15 x accuracy specification C SOURCE I MODE MANUAL OHMS Total uncertainty l source accuracy V measure accuracy 4 wire remote sense SOURCE V MODE Total uncertainty V source accuracy 1 measure accuracy 4 wire remote sense 6 WIRE OHMS MODE Available using active ohms guard and guard sense Max Guard Output Current 50 mA except 1A range Accuracy is load dependent Refer to manual for calculation formula GUARD OUTPUT IMPEDANCE 0 10 in ohms mode 1Speed Normal 1 PLC Accuracies apply to 2 or 4 wire mode when properly zeroed 34 wire mode Manual ohms mode only 5Source readback enabled offset compensation ON A 4 Specifications 2400 SPECIFICATIONS cont SYSTEM SPEEDS MEASUREMENT MAXIMUM RANGE CHANGE RATE 75 second MAXIMUM MEASURE AUTORANGE TIME 40ms fixed source SWEEP OPERATION READING RATES rdg second FOR 60Hz 50Hz Source Measure NPLC Trigger Measure Source Measure Pass Fail Test Source Memory Speed Origin To Mem To GP
49. 8 69 71 73 81 83 84 85 89 R3 RES 10 10 100MW THICK FILM R 418 10 R5 55 RES 10M 1 125MW THICK FILM R 418 10M R9 11 12 16 20 RES 100 5 250MW METAL FILM R 376 100 R10 RES 332K 1 100MW THICK FILM R 418 332K R15 17 18 21 23 31 48 59 61 64 70 72 RES 1 100MW THICK FILM R 418 1K R25 28 49 RES 4 75K 1 100MW THICK FILM R 418 4 75K R29 39 46 RES 0499 1 100MW THICK FILM R 418 0499 R30 26 RES 100 1 100MW THICK FILM R 418 100 R38 RES 14K 1 125MW METAL FILM R 391 14K R24 27 32 40 RES 5 1K 5 125MW METAL FILM R 375 5 1K R51 RES 4 75K 1 125MW METAL FILM R 391 4 75K R53 54 56 RES 3 01K 1 1000MW THICK FILM R 418 3 01K R57 RES 1 100MW THICK FILM R 418 1M R77 RES 15K 1 100MW THICK FILM R 418 15K R82 RES 499 1 100MW THICK FILM R 418 499 R91 92 RES 200 1 100MW THICK FILM R 418 200 S01 2 SOCKET PLCC 032 T A SO 143 32 S1 SWITCH PUSHBUTTON 6 POLE SW 466 TRANSFORMER FOR F SUPPLIES TR 302A TP1 9 CONN TEST POINT CS 553 U1 22 IC DUAL D TYPE F F 74HC74 IC 773 U2 IC MICROMANAGER DS12365 10 IC 884 U3 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 4 CHANNEL PWR DRIVER 2549B IC 1044 6 12 Replaceable Parts Table 6 2 cont Digital board parts list Keithley Circuit designation Description part no U8 IC NEG VOLTAGE REG 15V 500M
50. A 79M15 IC 195 U9 IC HEX INVERTERS 74HCT04 IC 880 011 VOLT COMPARATOR LM393D IC 775 U12 14 LARGE SCALE IC LSI 162 70 U13 IC GPIB ADAPTER 9914A LSI 123 U15 PROGRAMMED ROM 2400 803 U16 PROGRAMMED ROM 2400 804 U17 IC SERIAL EPROM 24LC16B LSI 153 U18 IC 5V VOLTAGE REGULATOR LM2940CT IC 576 U19 IC SCHMITT TRIGGER NAND GATE IC 950 U20 IC OCTAL INTERFACE BUS 75160 IC 646 U21 IC DUAL POWER MOSFET DRIVER TSC42 IC 437 U23 25 IC POS NAND GATES INVERT 74HCT14 IC 656 U24 IC TRIPLE 3 IN NAND 74F10 IC 659 DIODE ZENER 33V IN4752A DZ 68 Y1 CRYSTAL FSM327 CR 41 Order current firmware revision level Replaceable Parts 6 13 Table 6 3 Display board parts list K eithley Circuit designation Description part no C901 CAP 22UF 20 6 3 TANTALUM C 417 22 C902 904 907 908 910 CAP 1UF 2096 100V CERAMIC C 436 1 C903 905 906 909 911 CAP 1UF 20 50V CERAMIC C 418 1 C912 CAP 2 2UF 2096 100V ALUM ELEC C 503 2 2 C913 914 CAP 100UF 2096 16V TANTALUM C 504 100 C915 916 CAP 33PF 10 100V CERAMIC C 451 33P CR901 904 DIODE SWITCHING 250MA BAV103 RF 89 CR905 906 DIODE SWITCHING MMBD914 RF 83 DS901 VACUUM FLUORESCENT DISPLAY DD 51C J1032 CONN 3 PIN CS 339 3 J1033 CONN HEADER STRAIGHT SOLDER PIN CS 368 16 Q901 902 TRANS NPN GEN PURPOSE BC868 TG 293 R901 RES NET 15K 296 1 875W TF 219 15K R902 RES 13K 596 125MW METAL FILM R 375 13K R903 904 RES 4 7K 5 250MW METAL FILM R 37
51. C 488 2AT or CEC PC 488 IEEE 488 inter face for the computer Two shielded IEEE 488 connecting cables Keithley Model 7007 Software requirements In order to use the calibration programs you will need the following computer software Microsoft QBasic supplied with MS DOS 5 0 or later MS DOS version 5 0 or later HP style Universal Language Driver CECHP EXE supplied with Keithley and CEC interface cards listed above Calibration equipment The following calibration equipment is required Hewlett Packard HP3458A Digital Multimeter See Section 2 for detailed equipment specifications Calibration Programs C 3 General program instructions 1 With the power off connect the Model 2400 and the digital multimeter to the IEEE 488 interface of the computer Be sure to use shielded IEEE 488 cables for bus connections Also connect the digital multimeter to the Model 2400 as discussed in Section 2 2 Turn on the computer the Model 2400 and the digital multimeter Allow the Model 2400 and the multimeter to warm up for at least one hour before performing calibration 3 Make sure the Model 2400 is set for a primary address of 24 Use the front panel MENU GPIB selection to check or change the address 4 Make sure the digital multimeter primary address is set to its factory default setting 22 5 Make sure that the computer bus driver software is properly initialized Enter the
52. C C 521 47 C33 35 52 55 CAP 22UF 20 25V TANTALUM C 440 22 C48 57 58 CAP 1000PF 10 50V MONO CERAMIC C 452 1000P C62 CAP 10UF 20 25V TANTALUM C 440 10 C65 CAP 022UF 1096 50V CERAMIC C 491 022 C74 75 CAP 470UF 20 25V ALUM ELEC C 413 470 CR1 4 7 10 16 18 ULTRAFAST POWER RECTIFIER RF 107 CR6 9 12 20 ULTRAFAST POWER RECTIFIER RF 105 CR8 11 17 19 21 25 28 31 DIODE SWITCHING 250MA BAV103 RF 89 CR13 DIODE DUAL HSM 2822T31 RF 95 CR5 14 15 22 24 32 33 DIODE DUAL SWITCHING BAV99L RF 82 CR29 30 DIODE SWITCHING MMBD914 RF 83 Fl POLYSWITCH SMD030 2 FU 103 HS1 2 3 HEAT SINK HS 33 POS VOLTAGE 15V 500 7815 194 CONN RIGHT ANGLE 24 PIN CS 507 J3 CONN RIGHT ANGLE MALE 9 PIN CS 761 9 J5 CONN CIRCULAR DIN CS 762 J6 CONN D SUB MALE BOARDLOCK TYPE CS 848 9 J21 CONN MOLEX 3 PIN CS 772 3 L1 FERRITE CHIP 600 OHM BLM32A07 CH 62 LS1 BEEPER 5V 30MA QMX 05 EM 6 Table 6 2 cont Digital board parts list Replaceable Parts 6 11 Keithley Circuit designation Description part no P1001 CABLE ASSEMBLY CA 152 1 P1002 CABLE ASSEMBLY CA 151 1 P1003 CABLE ASSEMBLY CA 32 0B P1004 CABLE ASSEMBLY CA 62 4A 01 6 TRANS N MOSFET VN0605T TG 243 Q7 8 POWER MOSFET IRFZ346 TG 313 010 TRANS NPN MMBT3904 TG 238 R1 37 43 44 45 65 RES 2 21K 1 100MW THICK FILM R 418 2 21K R2 4 6 7 13 14 19 34 35 41 47 50 52 58 RES 10K 1 100MW THICK FILM R 418 10K 60 63 6
53. Document Number 2400 902 0 Addendum B Document Number 2400 902 02 Revision C Document Number 2400 902 01 Revision D Document Number 2400 902 0 0 0 All Keithley product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand names are trademarks or registered trademarks of their respective holders February 1996 September 1996 November 2000 Safety Precautions The following safety precautions should be observed before using this product and any associated in strumentation Although some instruments and accessories would normally be used with non hazardous voltages there are situations where hazardous conditions may be present This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury Read the operating information carefully before using the product The types of product users are Responsible body is the individual or group responsible for the use and maintenance of equipment for ensuring that the equipment is operated within its specifications and operating limits and for ensuring that operators are adequately trained Operators use the product for its intended function They must be trained in electrical safety procedures and proper use of the
54. E 7 9E 6 to 11E 6 1E 7 to 1E 7 100uA 90E 6 to 110E 6 1E 6 to 1E 6 90E 6 to 110E 6 1E 6 to IE 6 ImA 0 9E 3 to 1 1E 3 1E 5 to 1E 5 0 9E 3 to 1 1E 3 1E 5 to 1E 5 10mA 9E 3 to 11E 3 1E 4 to 1E 4 9E 3 to 11E 3 1E 4 to 1E 4 100mA 90E 3 to 110E 3 1E 3 to 1E 3 90E 3 to 110E 3 1E 3 to 1E 3 1A 0 9 to 1 1 1E 2 to 1E 2 0 9 to 1 1 1 2 to 1E 2 NOTE Parameter steps for each range may be performed in any order but all four parameter steps for each range must be completed 2 18 Calibration Remote calibration procedure Step 1 Prepare the Model 2400 for calibration 1 Connect the Model 2400 to the controller IEEE 488 interface or RS 232 port using a shielded interface cable 2 Turn on the Model 2400 and the test equipment and allow them to warm up for at least one hour before performing calibration 3 If you are using the IEEE 488 interface make sure the primary address of the Model 2400 is the same as the address specified in the program you will be using to send commands Use the MENU key and the COMMUNICATION menu to access the IEEE 488 address Step 2 Voltage Calibration 1 Connect the Model 2400 to the digital multimeter see Figure 2 1 and select the multi meter DC volts function 2 Sendthe commands summarized in Table 2 8 in the order listed to initialize voltage cal ibration When the CAL PROT CODE command is sent the instrument will assume the operating s
55. ER to Output 1 0000uA Figure 2 2 Current calibration connections KEITHLEY TE SNE MEAS T SOURCE 09000000 amp DISPLAY 1 4 A b con RANGE w Gap Gas POWER H 9 RANGE 5 0 GD GED ED GED Model 2400 Input LO Amps Digital Multimeter 10 11 12 13 14 15 16 17 18 19 Calibration 2 13 Press ENTER The Model 2400 will source 1uA and simultaneously display the following DMM RDG 1 000000UA Use 4 V ENTER or EXIT Note and record the DMM reading and then adjust the Model 2400 display to agree exactly with the actual DMM reading Use the up and down arrow keys to select the digit value use the left and right arrow keys to choose the digit position Note that the display adjustment range is within 10 of the present range After adjusting the display to agree with the DMM reading press ENTER The instru ment will then display the following I CAL Press ENTER to Output 0 0000uA Press ENTER The Model 2400 will source OuA and at the same time display the following DMM RDG 0 000000UA Use 4 V ENTER or EXIT Note and record the DMM reading and then adjust the Model 2400 display to agree with the actual DMM reading Note that the display value adjustment limits are within 1 of the present range After adjusting the display value to agree with th
56. F 15 VF and 30VF An AC output low volt age supplies the analog board with the power it uses to derive the output stage supply voltages 36VO and 220VO Power supply block diagram Analog Board O utput Stage 430V 15V 45V 15V 30V 220 436 W 36 220 High Voltage Power Constant Frequency AGL Low Noise Floating AC2 Switching Supply Z N Digital Circuits r 9 Z 12Vd Line 5Vd Neutral Switching Power Supply 797 12Vd NV P Troubleshooting 4 7 Output stage Figure 4 3 shows a simplified schematic of the output stage The Model 2400 output stage serves two purposes 1 it converts signals from floating com mon to output common and 2 it provides both voltage and current amplification The output stage drive transistors are biased in class B configuration to prevent the possibility of thermal runaway with high current output values High current taps for the 20V outputs are provided to reduce power dissipation on the 20V and lower ranges Output transistors Q518 and Q521 are cascoded with output MOSFETs Q516 and Q523 All other MOSFETs and transistors are slaves and the voltages across these devices are deter mined by the resistor capacitor ladder circuits shown Coarse current limits are built into the output stage Figure 4 3 3 0 225 Output stage ak simpl
57. F 237 2 FILM RT200 POLYSWITCH PTC RESISTOR RT 17 T500 TRANSFORMER FOR 0 SUPPLIES TR 303A TP200 215 218 225 227 228 230 235 CONN TEST POINT CS 553 500 510 U201 212 214 230 241 400 406 652 IC CMOS ANAL SWITCH DG444D IC 866 U202 203 650 IC OP AMP LT1112 IC 1048 U204 229 IC 8 CHAN ANA MULTIPLEXER DG408D IC 844 U205 407 IC HEX INVERTERS 74HCT04 IC 880 U209 215 IC QUAD COMPARATOR LM339D IC 774 U210 220 IC DUAL BIPOLAR OP AMP LT1124CS8 IC 955 U221 227 IC DIFF AMP AMPO3GP IC 988 U222 IC OP AMP LTC1050CS8 IC 791 U223 409 IC MOSFET DRIVER TLP591B IC 877 U228 IC OP AMP LOW NOISE LT1007CS8 IC 949 U219 231 235 IC OP AMP LOW POWER AD795JR IC 1052 U234 IC OP AMP OPA602 IC 1049 U238 IC CMOS ANA SWITCH SPST MAX326CSE IC 909 U239 IC QUAD 2 INPUT NAND 74HC00M IC 781 U240 IC POS NAND GATES INVERT 74HCT14 656 U242 247 IC DUAL HIGH CMR SPEED OPTO IC 588 HCPL 26 U252 256 IC 8 STAGE SHIFT CD74HC4094M IC 1026 U257 IC SUPPLY VOLT SUPERVISOR TL7705A IC 860 U262 263 226 659 IC 20V OP AMP LT1097S8 IC 767 U211 213 216 218 225 233 408 IC M DUAL J FET OP AMP OP 282GS IC 968 U500 IC OP AMP AD847JN IC 890 U501 IC VOLT COMPARATOR LM393 IC 775 U502 PROGRAMMABLE TEMP CONTROLLER 1062 U206 208 264 600 IC DUAL PICOAMP OP AMP AD706JR IC 910 U601 IC QUAD D FLIP FLOP W CLK IC 923 RESET 7474 U604 IC NCHAN LAT DMOS QUADFET IC 893 SD5400CY U605 INTEGRATED CIRCUIT OPA177GS IC 960 U606 236 IC HI SPEED BIFET OP AMP
58. GITAL INTERFACE Safety Interlock Active low input Handler Interface Start of test end of test 3 category bits 45V 9 300mA supply Digital 1 0 1 trigger input 4TTL Relay Drive outputs 33V 9 500mA sink diode clamped POWER SUPPLY 88V to 264V rms 50 60Hz automatically detected at power up WARRANTY 1 year EMC Conforms with European Union Directive 89 336 EEC 55011 EN 50082 1 EN 61000 3 2 and 61000 3 3 FCC part 15 class B SAFETY Conforms with European Union Directive 73 23 EEC EN 61010 1 VIBRATION MIL T 28800E Typelll Class 5 WARM UP 1 hour to rated accuracies DIMENSIONS 89mm high x 213mm wide x 370mm deep 3 in x 8 x 1471 in Bench Configuration with handle amp feet 104mm high x 238mm wide x 370mm deep 4 in x 97 in x 1476 in WEIGHT 3 21kg 7 08 Ibs ENVIRONMENT Operating 0 50 C 70 R H up to 35 C Derate 3 R H C 35 50 C Storage 25 C to 65 C 1 Except lowest 2 current ranges 90dB Specifications subject to change without notice A 10 Accuracy calculations The information below discusses how to calculate accuracy for both sense and source functions Measure accuracy Measurement accuracy is calculated as follows Accuracy of reading offset As an example of how to calculate the actual reading limits assume that you are measuring 10V on the 20V range You can compute the reading limit range from one year measure voltage accuracy specifica
59. IB ToGPIB ToMem ToGPIB ToGPIB Fast 0 01 internal 2081 2030 1198 1210 1551 1515 1000 900 902 900 809 840 165 162 164 162 0 01 external 1239 1200 1079 1050 1018 990 916 835 830 830 756 780 163 160 162 160 Medium 0 10 internal 510 433 509 433 470 405 470 410 389 343 388 343 133 126 132 126 0 10 external 438 380 438 380 409 360 409 365 374 333 374 333 131 125 131 125 Normal 1 00 internal 59 49 59 49 58 48 58 48 56 47 56 47 44 38 44 38 1 00 external 57 48 57 48 57 48 57 47 56 47 56 47 44 38 44 38 SINGLE READING OPERATION READING RATES rdg second FOR 60Hz 50Hz Measure Source Measure Source Measure Pass Fail Test Speed NPLC Trigger Origin To GPIB To GPIB To GPIB Fast 0 01 internal 256 256 79 83 79 83 Medium 0 10 internal 167 166 72 70 69 70 Normal 1 00 internal 49 42 34 31 35 30 COMPONENT HANDLER INTERFACE TIME 46 Speed NPLC Trigger Orign Measure Pass Fail Test Source Pass Fail Test Source Measure Pass Fail Test Fast 0 01 external 1 04 1 08 ms 0 5 ms 0 5 ms 4 82 5 3 Medium 0 10 external 2 55 5 2 9ms 0 5ms 0 5 ms 6 27ms 7 1 ms Normal 1 00 external 17 53ws 20 9 ms 0 5 ms 0 5 ms 21 31 ms 25 0 ms 1 Reading rates applicable for voltage or current measurements Auto zero off autorange off filter off display off trigger delay 0 source auto clear off
60. INPUT OUTPUT jacks as shown in Figure 1 1 2 Selectthe multimeter DC volts measuring function NOTE The default voltage source protection value is 40V Before testing the 200V range set the voltage source protection value to gt 200V To do so press CONFIG then SOURCE V to access the CONFIGURE V SOURCE menu then select PROTEC TION and set the limit value to gt 200V 3 Press the Model 2400 SOURCE V key to source voltage and make sure the source out put is turned on 4 Verify output voltage accuracy for each of the voltages listed in Table 1 2 For each test point Select the correct source range Set the Model 2400 output voltage to the indicated value Verify that the multimeter reading is within the limits given in the table Performance Verification 1 9 Voltage verifi cation front panel connections Pl KEITHLEY 2400 SourceMeter MEAS Y SOURCE e 09080098 a gum Gap Geom Power er rumes n mace Q GED GED Gem GLE Model 2400 Input HI Input LO e e Digital Multimeter 5 Repeat the procedure for negative output voltages with the same magnitudes as those listed in Table 1 2 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 2 O utput voltage accuracy limits Model 2400 Model 2400 Output voltage limi
61. K FILM R 418 357 R308 379 387 391 392 RES 475 1 100MW THICK FILM R 418 475 R309 504 511 RES 10K 1 100MW THICK FILM R 418 10K R332 423 604 606 RES 499 1 100MW THICK FILM R 418 499 R346 RES 357K 1 100MW THICK FILM R 418 357K R347 RES 332K 1 100MW THICK FILM R 418 332K R348 RES 255K 1 100MW THICK FILM R 418 255K R354 RES 1M 5 250MW METAL FILM R 376 1M Table 6 1 cont Analog board parts list Replaceable Parts 6 7 Keithley Circuit designation Description part no R356 359 418 421 456 458 460 462 464 489 RES 1 100MW THICK FILM R 418 1K R358 RES 3 01K 1 100MW THICK FILM R 418 3 01K R363 THICK FILM TF 253 R367 424 425 426 484 487 603 605 RES 4 99K 1 100MW THICK FILM R 418 4 99K R368 RES 332 1 100MW THICK FILM R 418 332 R374 RES 49 9K 1 100MW THICK FILM R 418 49 9K R377 378 RES 6 65K 1 125MW METAL FILM R 391 6 65K R450 RES 2 0M 1 1 4MW METAL FILM R 321 2M R451 RES 221K 1 1 10W METAL FILM R 263 221K R452 RES 20K 5 1 8W METAL FILM R 351 20K R453 RES 2K 1 1 2W METAL FILM R 348 2K R454 455 467 471 RES 100 1 1 10W METAL FILM R 263 100 R463 465 473 RES 30 1K 1 100MW THICK FILM R 418 30 1K R474 477 RES 2 1 1W R 441 2 R479 RES 249 1 100MW THICK FILM R 418 249 R500 502 513 515 527 528 533 535 RES 576K 1 100MW THICK FILM R 418 576K R501 503 512 514 529 530 532 534 RES 249 1 100MW THICK FILM R 418 249 R505 510
62. M odel 2400 sourceM eter Service M anual A GREATER MEASURE OF CONFIDENCE WARRANTY Keithley Instruments Inc warrants this product to be free from defects in material and workmanship for a period of year from date of shipment Keithley Instruments Inc warrants the following items for 90 days from the date of shipment probes cables rechargeable batteries diskettes and documentation During the warranty period we will at our option either repair or replace any product that proves to be defec tive To exercise this warranty write or call your local Keithley representative or contact Keithley headquarters in Cleveland Ohio You will be given prompt assistance and return instructions Send the product transportation prepaid to the indicated service facility Repairs will be made and the product returned transportation prepaid Repaired or replaced products are warranted for the balance of the original warranty period or at least 90 days LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modification without Keithley s express written consent or misuse of any product or part This warranty also does not apply to fuses software non recharge able batteries damage from battery leakage or problems arising from normal wear or failure to follow instruc tions THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUD ING ANY IMPLIED WARRANTY OF MERCHANTABILI
63. NG _ Theinformation in this section is intended for qualified service personnel only Do not attempt these procedures unless you are qualified to do so Some of these procedures may expose you to hazardous voltages which could cause personal injury or death if contacted U se standard safety pre cautions when working with hazardous voltages NOTE Ifthe instrument is still under warranty and its performance is outside specified limits contact your Keithley representative or the factory to determine the correct course of action Verification test requirements Be sure that you perform the verification tests Under the proper environmental conditions e After the specified warm up period Using the correct line voltage Using the proper test equipment Using the specified output signal and reading limits Environmental conditions Conduct your performance verification procedures in a test environment with An ambient temperature of 18 28 65 82 F Arelative humidity of less than 70 unless otherwise noted Warm up period Allow the Model 2400 to warm up for at least one hour before conducting the verification 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 Typically allow one extra hour to stabilize a unit that is 10 C 18 F outside the specified temperature range Als
64. QBasic editor and enter in the following program Check thoroughly for errors and then save it using a convenient filename 7 Run the program and follow the prompts on the screen to perform calibration Program C 1 Model 2400 calibration program Model 2400 calibration program for use with the HP3458A Digital Multimeter Rev 1 0 12 28 95 2400 primary address 24 HP3458A primary address 22 OPEN IEEE FOR OUTPUT AS 1 Open IEEE 488 output path OPEN IEEE FOR INPUT AS 2 Open IEEE 488 input path PRINT INTERM CRLF Set input terminator PRINT OUTTERM LF Set output terminator PRINT REMOTE 22 24 Put 2400 3458A in remote PRINT CLEAR Send DCL PRINT 1 OUTPUT 24 CLS Initialize 2400 PRINT OUTPUT 24 ESE 1 SRE 32 Enable OPC and SRQ PRINT 41 OUTPUT 22 PRESET NORM Initialize 3458A PRINT OUTPUT 22 NPLC 10 NDIG 7 TRIG LINE FUNC DCV AUTO CLS Clear CRT PRINT Model 2400 Calibration Program PRINT Connect DMM volts input to Model 2400 INPUT OUTPUT jacks GOSUB KeyCheck FOR J 1 TO 2 Select volts current cal If J 1 THEN RESTORE VoltsInit Max 8 Range 2 Limit 200 ELSE RESTORE CurrentInit Max 4 Range 000001 Limit 1 C4 Calibration Programs PRINT 41 OUTPUT 22 FUNC DCI AUTO PRINT Connect DMM current input to 2400 INPUT OUTPUT jacks GOSUB KeyCheck
65. RD REPLACE FUSE WITH SAME TYPE AND RATING Fuse 3 4 Routine Maintenance 4 Troubleshooting 4 2 Troubleshooting Introduction This section of the manual will assist you in troubleshooting and repairing the Model 2400 Included are self tests test procedures troubleshooting tables and circuit descriptions The repair technician must select the appropriate tests and documentation needed to troubleshoot the instrument Note that disassembly instructions are located in Section 5 while component layout drawings are at the end of Section 6 WARNING _ Theinformation in this section is intended for qualified service personnel only Do not perform these procedures unless you are qualified to do so Some of these procedures may expose you to hazardous voltages that could cause personal injury or death U se caution when working with hazardous voltages Repair considerations Before making any repairs to the Model 2400 be sure to read the following considerations CAUTION boards are built using surface mount techniques and require spe cialized 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 the PC board replacement level Without proper equipment and training you could damage a PC board beyond repair Repairs will require various degrees of disassembly However it is recommended that
66. S Input SRQ status byte LOOP UNTIL S Wait for operation complete PRINT 1 OUTPUT 24 ESR Clear OPC PRINT 1 ENTER 24 NPUT 2 S PRINT 1 SPOLL 24 Clear 5100 NPUT 2 S RETURN ErrCheck Error check routine PRINT 41 OUTPUT 24 SYST ERR Query error queue PRINT 41 ENTER 24 INPUT 42 E Err IF E lt gt 0 THEN PRINT Err GOTO EndProg Display error RETURN ReadDMM Get reading from DMM SLEEP 5 PRINT 41 ENTER 22 INPUT 2 Reading RETURN EndProg Close files end program BEEP PRINT Calibration aborted PRINT 41 OUTPUT 24 CAL PROT LOCK PRINT 1 OUTPUT 24 RST PRINT 41 LOCAL 22 24 CLOSE END VoltsInit Calibration command lists DATA RST SOUR FUNC VOLT SENS CURR PROT 0 1 DATA SENSE CURR RANG 0 1 SOUR VOLT PROT LEV MAX SYST RSEN OFF DATA CAL PROT CODE KI002400 OUTP STAT ON VoltsCal DATA SOUR VOLT RANG SOUR VOLT DATA CAL PROT SOUR CAL PROT SENS SOUR VOLT 0 0 DATA CAL PROT SOUR CAL PROT SENS SOUR VOLT CAL PROT SOUR DATA CAL PROT SENSE SOUR VOLT 0 0 CAL PROT SOUR CurrentInit DATA SOUR FUNC CURR SENS VOLT PROT 20 SENS VOLT RANG 20 DATA OUTP STAT ON CurrentCal DATA SOUR CURR RANG SOUR CUR CAL PROT SOUR DATA CAL PROT SENS SOUR CURR 0 0 CAL PROT SOUR CAL PROT SENS DATA SOUR CURR CAL PROT SOUR CAL PROT SENS DATA SOUR CURR 0 0 CAL PROT SOUR
67. TRANS CURRENT REGULATOR CR430 TG 219 Q220 225 TRANS NPN SILICON MJE340 TG 209 Q221 226 TRANS PNP POWER MJE350 TG 210 Q222 224 TRANS N CHAN JFET SST4393 TG 263 Q234 239 244 246 255 256 400 401 404 TRANS N MOSFET VN0605T TG 243 Q242 243 TRANS N CHAN MOSFET TN2540N8 TG 274 Q402 409 TRANS N CHAN DMOS FET TN2504N8 TG 261 Q403 406 407 408 TRANS N CHAN JFET SST109 TG 266 Q223 405 410 411 602 607 TRANS N MOSFET VN0605T TG 243 Q412 414 TRANS N MEGAFET RFD 14NOSLSM TG 267 Q413 TRANS P CHAN MOSFET TP0610T TG 259 Q415 TRANS P FET MTP20P06 TG 229 Q500 502 514 516 TRANS N CHANNEL FET IRF630 TG 214 Q501 503 505 508 510 512 513 528 TRANS NPN MMBT3904 TG 238 Q504 TRANS NPN TIP48 TG 314 Q506 520 601 529 TRANS PNP MMBT3906L TG 244 Q507 TRANS PMP 5731 TG 315 Q509 511 523 525 TRANS P CHANNEL 200V FET IRF9630 TG 215 6 6 Replaceable Parts Table 6 1 cont Analog board parts list Keithley Circuit designation Description part no Q515 517 519 522 524 600 TRANS NPN MMBT3904 TG 238 Q518 TRANS NPN DARLINGTON TIP101 TG 230 Q521 TRANS PNP DARLINGTON TIP106 TG 231 Q526 527 N CHANNEL ENHANCED MOSFET TG 302 R117 128 133 136 137 149 RES 10K 5 250MW METAL FILM R 376 10K R150 153 336 340 343 353 355 361 362 365 RES 1K 1 100MW THICK FILM R 418 1K 369 389 390 466 472 478 480 48 1 520 522 R200 201 203 232 238 RESISTOR NETWORK TF 236 R202 204 252 255 256 259 260 263 264 267 RES
68. TY OR FITNESS FOR A PARTICULAR USE THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY 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 ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EXCLUDED DAM AGES SHALL INCLUDE BUT ARE NOT LIMITED TO COSTS OF REMOVAL AND INSTALLATION LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON OR DAMAGE TO PROPERTY KEITHLEY Keithley Instruments Inc 28775 Aurora Road Cleveland OH 44139 440 248 0400 Fax 440 248 6168 http www keithley com BELGIUM Keithley Instruments B V Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 CHINA Keithley Instruments C hina Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 62022886 Fax 8610 62022892 FRANCE Keithley Instruments Sarl 3 all e des Garays 91127 Palaiseau Cedex 01 64 53 20 20 Fax 01 60 11 77 26 GERMANY Keithley Instruments G mbH Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Keithley Instruments Ltd The Minster 58 Portman Road Reading Berkshire RG30 1EA 0118 9 57 56 66 Fax 0118 9 59 64 69 INDIA Keithley Instruments G mbH Flat 2B WILOCRISSA 14 Rest House Cres
69. al display press MENU select CAL and then press ENTER The unit will display the following CALIBRATIO N UNLOCK EXECUTE VIEW D ATES p gt 2 Select VIEW DATES and then press ENTER The Model 2400 will display the next and last calibration dates and the calibration count as in the following example NEXT CAL 12 15 96 Last calibration 12 15 95 Count 00001 Calibration errors The Model 2400 checks for errors after each calibration step minimizing the possibility that improper calibration may occur due to operator error Front panel error reporting If an error is detected during comprehensive calibration the instrument will display an appropriate error message see Appendix B The unit will then prompt you to repeat the calibration step that caused the error Remote error reporting You can detect errors while in remote by testing the state of EAV Error Available bit bit 2 in the status byte Use the STB query to request the status byte Query the instrument for the type of error by using the appropriate SYST ERR query The Model 2400 will respond with the error number and a text message describing the nature of the error See Appendix B for details 2 8 Calibration Front panel calibration The front panel calibration procedure described in the following paragraphs calibrates all ranges of both the current and voltage source and measure functions Note that each function is separately calibrated by repeating the ent
70. ance Table 3 1 Powerline fuse 3 2 4 Troubleshooting Table 4 1 Display board checks Table 4 2 Power supply checks eere Table 4 3 Digital circuitry checks Table 4 4 Analog circuitry checks 6 Replaceable Parts Table 6 1 Analog board parts list sss Table 6 2 Digital board parts list sse Table 6 3 Display board parts list Table 6 4 Mechanical parts list Table B 1 Table B 2 Table B 3 Table B 4 Command Reference Remote calibration command summary CALibration PROTected S ENSe parameter ranges CALibration PROTected SOURce parameter ranges Calibration errors nennen Performance Venfication 1 2 Performance Verification Introduction Use the procedures in this section to verify that Model 2400 accuracy is within the limits stated in the instrument s one year accuracy specifications You can perform these verification procedures When you first receive the instrument to make sure that it was not damaged during shipment To verify that the unit meets factory specifications To determine if calibration is required Following calibration to make sure it was performed properly WARNI
71. anges 0 2V 2V 20V and 200V The feedback gain changes for only the 20V and 200V ranges resulting in three unique feedback gain values A multiplexer directs the voltage feedback current feedback reference or ground signal to the A D converter An opto isolated interface provides control signals for both DACs analog circuit control and A D converter communication to the digital section Analog circuit block diagram V DAC I DAC V Clamp 36 220 36 220 Control IFB Clamp Error Amp Output Stage Sense Output VFB VFB x Resistors HI e O S o Output LO 7 IFB A D MUX Protection Protection o OS Guard Out Guard Sense 4 6 Troubleshooting Power supply Figure 4 2 Figure 4 2 shows a block diagram of the Model 2400 power delivery system The offline flyback switching power supply provides all power for the instrument while provid ing universal inputs for the 110 120V line The digital board runs directly from the switcher including the 12VD supply See Digital circuitry A constant frequency switching supply runs off the 12VD supplies and generates all the float ing supply voltages for the analog board 5 V
72. as follows They assume the measurement function is the same as the compliance function Compliance Setting Measurement Range Real Compliance Measurement Range Compliance Setting Range Compliance You can determine the compliance that is in effect by comparing the displayed compliance setting to the present measurement range If the compliance setting is lower than the maximum possible reading on the present measurement range the compliance setting is the compliance limit If the compliance setting is higher than the measurement range the maximum reading on that measurement range is the compliance limit 1 8 Performance Verification Taking the SourceM eter out of compliance Verification measurements should not be made when the SourceMeter is in compliance For purposes of the verification tests the SourceMeter can be taken out of compliance by going into the edit mode and increasing the compliance limit NOTE Do not take the unit out of compliance by decreasing the source value or changing the range Always use the recommended range and source settings when performing the verification tests 0 utput voltage accuracy Follow the steps below to verify that Model 2400 output voltage accuracy is within specified limits This test involves setting the output voltage to each full range value and measuring the voltages with a precision digital multimeter 1 With the power off connect the digital multimeter to the Model 2400
73. at Model 2400 current measurement accuracy is within specified limits The procedure involves applying accurate currents from the Model 2400 current source and then verifying that Model 2400 current measurements are within required limits 1 With the power off connect the digital multimeter to the Model 2400 INPUT OUTPUT jacks as shown in Figure 1 2 Select the multimeter DC current function Set the Model 2400 to both source and measure current by pressing the SOURCE I and MEAS I keys and make sure the source output is turned on Verify measure current accuracy for each of the currents listed in Table 1 5 For each measurement Select the correct source range Set the Model 2400 source output to the correct value as measured by the digital multimeter Verify that the Model 2400 current reading is within the limits given in the table Performance Verification 1 13 NOTE may not be possible to set the current source to the specified value Use the closest possible setting and modify reading limits accordingly 5 Repeat the procedure for negative calibrator currents with the same magnitudes as those listed in Table 1 5 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 Current measurement accuracy limits Model 2400 source and Model 2400 current reading limits measure range Source current 1 year
74. aults as outlined above Make sure that the test equipment is properly warmed up and connected to the Model 2400 INPUT OUTPUT jacks Also ensure that the front panel jacks are selected with the TERMINALS key Make sure the Model 2400 is set to the correct source range Be sure the Model 2400 output is turned on before making measurements sure the test equipment is set up for the proper function and range Allow the Model 2400 output signal to settle before making a measurement Do not connect test equipment to the Model 2400 through a scanner multiplexer or other switching equipment WARNING common mode voltage voltage between LO and chassis ground is 250V peak Exceeding this value may cause a breakdown in insulation creating a shock hazard CAUTION voltage between INPUT OUTPUT HI and LO or 4 WIRE SENSE HI and LO is 250V peak The maximum voltage between IN PUT OUTPUT HI and 4 WIRE SENSE HI or between INPUT OUTPUT LO and 4 WIRE SENSE LO is 5V E xceeding these voltages may result in instrument damage 1 6 Performance Verification Setting the source range and output value 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 function 2 Press the EDIT key as required to select the source display field Note that the curso
75. cent Bangalore 560 001 91 80 509 1320 21 Fax 91 80 509 1322 ITALY Keithley Instruments s r l Viale S Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 NETHERLANDS Keithley Instruments B V Postbus 559 4200 AN Gorinchem 0183 635333 Fax 0183 630821 SWITZERLAND Keithley Instruments SA Kriesbachstrasse 4 8600 D bendorf 01 821 94 44 Fax 01 820 30 81 TAIWAN Keithley Instruments Taiwan 1 Fl 85 Po Ai Street Hsinchu Taiwan R O C 886 3572 9077 Fax 886 3572 903 9 00 Model 2400 SourceM eter Service M anual 1996 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Fourth Printing November 2000 Document Number 2400 902 01 Rev D Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual The Revision Level letter increases alphabetically as the manual undergoes sub sequent updates Addenda which are released between Revisions contain important change in formation that the user should 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 Revision of the manual Each new Revision includes a revised copy of this print history page Revision A Document Number 2400 902 01 Revision B
76. ction negative full scale 7 Check 2400 for errors 8 SOUR VOLT 0 0 Set output to OV 9 Take DMM reading Read actual output value 10 CAL PROT SOUR DMM Reading Calibrate sense function negative zero 11 Check 2400 for errors 12 CAL PROT SENS DMM Reading Calibrate source function negative zero 13 Check 2400 for errors 14 SOUR VOLT Range Establish positive polarity 15 Take DMM reading Read actual output value 16 CAL PROT SOUR DMM Reading Calibrate sense function positive full scale 17 Check 2400 for errors 18 CAL PROT SENS DMM Reading Calibrate source function positive full scale 19 Check 2400 for errors 20 SOUR VOLT 0 0 Set output to OV 2 Take DMM reading Read actual output value 22 CAL PROT SOUR DMM Reading Calibrate source positive zero Perform complete procedure for each range where Range 0 2 2 20 and 200 2 DMM Reading parameter is multimeter reading from previous step 3 Use SYST ERR query to check for errors Use the multimeter reading as the parameter for the CAL PROT SOUR and CAL PROT SENS commands For example a typical value for the 2V range would be CAL PROT SO UR 1 998 CAL PROT SENS 1 998 Program the voltage source for OV output using the SOUR VOLT 0 0 command Note the multimeter reading Send the source and sense calibration commands using the multimeter reading for the parameter For exam
77. d LO is 250V peak The maximum voltage between IN PU T OUTPUT HI and 4 WIRE SENSE HI or between INPUT OUTPUT LO and 4 WIRE SENSE LO is 5V E xceeding these voltage values may result in instrument damage Calibration cycle Perform calibration at least once a year to ensure the unit meets or exceeds its specifications 2 4 Calibration Recommended calibration equipment Table 2 1 lists the recommended equipment for the calibration procedures You can use alternate equipment as long as that equipment has specifications at least as good as those listed in the table When possible test equipment specifications should be at least four times better than corresponding Model 2400 specifications Table 2 1 Recommended calibration equipment Description Manufacturer M odel Accuracy Digital Multimeter Hewlett Packard DC voltage 200mV 15 HP3458A 2V 6ppm 20V 9ppm 200V 7ppm DC current 1pA 55ppm 10uA 25ppm 100uA 23ppm 1mA 20ppm 10mA 20ppm 100mA 35ppm 1A 110ppm 90 day specifications show accuracy at specified measurement point Unlocking calibration Before performing calibration you must first unlock calibration by entering or sending the calibration password as follows Front panel calibration password 1 Press the MENU key then choose CAL and press ENTER The instrument will display the following CALIBRATION UNLOCK EXECUTE VIEW D ATES p gt SAVE LOCK CHANGE PASSW ORD
78. e DMM reading press ENTER The unit will then display the following I CAL Press ENTER to Output 1 0000uA Press ENTER The Model 2400 will source 1uA and display the following DMM RDG 1 000000UA Use 4 V ENTER or EXIT Note and record the DMM reading then adjust the Model 2400 display to agree with the DMM reading Again the maximum display adjustment is within 10 of the present range After adjusting the display value to agree with the DMM reading press ENTER and note that the instrument displays I CAL Press ENTER to Output 0 0000uA Press ENTER The Model 2400 will source and simultaneously display the following DMM RDG 0 000000UA Use 4 V ENTER or EXIT Note and record the DMM reading and then adjust the display to agree with the DMM reading Once again the maximum adjustment is within 1 of the present range After adjusting the display to agree with the DMM reading press ENTER to complete calibration of the present range Press EXIT to return to normal display then select the 0 source range using the EDIT and up RANGE keys Repeat steps 2 through 18 for the 10uA range 2 14 Calibration 20 After calibrating the 10 range repeat the entire procedure for the 100uA through 1A ranges using Table 2 4 as a guide Be sure to select the appropriate source range with the EDIT and up RANGE keys before calibrating each range Table 2 4 Front panel current calibration
79. e accuracy 10 35mA above 105mA Full operation 1A regardless of load to 30 C Above 30 C ambient derate 35mA C and prorate 35mA Q load 4 wire mode For current sinking up to 10W external power at 23 C Above 23 C derate 1W C 3For sink mode to 100mA range accuracy is 0 15 offset 4 For 1A range accuracy is 1 5 offset 8 ADDITIONAL SOURCE SPECIFICATIONS TRANSIENT RESPONSE TIME 30us typical for the output to recover to its spec following a step change in load Resistive load COMMAND PROCESSING TIME Maximum time required for the output to begin to change following the receipt of SOU Rce VOLTage CURRent lt nrf gt command Autorange On 10ms Autorange Off 7ms OUTPUT SETTLING TIME Time required to reach 0 1 of final value after command is processed 100us typical Resistive load OUTPUT SLEW RATE 0 5V us 200V range 100mA compliance 0 08V us 2V and 20V ranges 100mA compliance Specifications A 7 2400 C SPECIFICATIONS cont DC FLOATING VOLTAGE Output can be floated up to 250VDC from chassis ground REMOTE SENSE Up to 1V drop per load lead COMPLIANCE ACCURACY Add 0 1 of range to base specification OVER TEMPERATURE PROTECTION Internally sensed temperature overload puts unit in standby mode RANGE CHANGE OVERSHOOT Overshoot into a fully resistive 100kQ load 10Hz to 1 2 BW adjacent ranges Smooth Mode 100mV typical except 20V 200V range boundary MINIMUM COMPLIANCE
80. e board should be returned to the factory for proper cleaning servicing Rev 10 99 Table of Contents 1 Performance Verification Introduction iae te ed eave Verification test requirements Environmental conditions Warm up period Line power ua aan Recommended test equipment Verification limits Restoring factory defaults Performing the verification test procedures MESUSUIMIMALY q Test considerations Setting the source range and output value Setting the measurement range sese Compliance considerations sese Compliance limits Types of compliance Maximum compliance values Determining compliance limit Taking the SourceMeter out of compliance Output voltage accuracy Voltage measurement accuracy
81. e describe Be sure to include your name and phone number on this service form Specifications are subject to change without notice All Keithley trademarks and trade names are the property of Keithley Instruments Inc All other trademarks and trade names are the property of their respective companies KEITHLEY Keithley Instruments Inc BELGIUM Keithley Instruments B V CHINA Keithley Instruments C hina FRANCE Keithley Instruments Sarl GERMANY Keithley Instruments G mbH GREAT BRITAIN Keithley Instruments Ltd INDIA Keithley Instruments G mbH ITALY Keithley Instruments s r l KOREA Keithley Instruments K orea NETHERLANDS Keithley Instruments B V SWITZERLAND Keithley Instruments SA TAIWAN Keithley Instruments Taiwan Copyright 2000 Keithley Instruments Inc Printed in the U S A 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 K EITHLEY 534 8453 www keithley com Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 6202 2886 Fax 8610 6202 2892 3 all e des Garays 91127 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 Landsberger Strasse 65 D 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 The Minster 58 Portman Road Reading Berkshire RG30 1EA 0118 9 57 56 66 Fax 0118 9 59 64 69 Flat 2B WILLOCRISSA 14
82. ed at the end of Section 5 Ordering information To place an order or to obtain information concerning replacement parts contact your Keithley representative or the factory see inside front cover for addresses When ordering parts be sure to include the following information Instrument model number Model 2400 Instrument serial number Part description Component designation if applicable Keithley part number Replaceable Parts 6 3 Factory service If the instrument is to be returned to Keithley Instruments for repair perform the following Call the Repair Department at 1 800 552 1115 for a Return Material Authorization RMA number Complete the service form at the back of this manual and include it with the instrument Carefully pack the instrument in the original packing carton Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label Component layouts The component layouts for the various circuit boards are provided on the following pages Analog board 2400 100 Display board 2400 110 Digital board 2400 140 6 4 Replaceable Parts Table 6 1 Analog board parts list K eithley Circuit designation Description part no C200 203 205 210 225 226 231 232 237 238 CAP 1UF 10 25V CERAMIC C 495 1 242 243 248 255 258 261 269 272 273 282 284 291 297 300 524 525 530 531 542 548 549 554 605 607 613 614 617 625 650 652 659 662 C204 40
83. ed procedure The CAUTION heading in a manual explains hazards that could damage the instrument Such damage may invalidate the warranty Instrumentation and accessories shall not be connected to humans Before performing any maintenance disconnect the line cord and all test cables To maintain protection from electric shock and fire replacement components in mains circuits including the power transformer test leads and input jacks must be purchased from Keithley Instruments Standard fuses with applicable national safety approvals may be used if the rating and type are the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component Note that selected parts should be purchased only through Keithley Instruments to maintain ac curacy and functionality of the product If you are unsure about the applicability of a replacement component call a Keithley Instruments office for information To clean an instrument use a damp cloth or mild water based cleaner Clean the exterior of the instrument only Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument Prod ucts that consist of a circuit board with no case or chassis e g data acquisition board for installation into a computer should never require cleaning if handled according to instructions If the board becomes contami nated and operation is affected th
84. egative full range value using the SOUR CURR command For example SOUR CURR 1E 3 Note and record the multimeter reading Use the multimeter reading as the parameter for the CAL PROT SOUR and CAL PROT SENS commands For example a typical value for the ImA range would be CAL PRO T SOUR 1 025E 3 CAL PRO T SEN S 1 025E 3 Program the current source for OA output using the SOUR CURR 0 0 command Note the multimeter reading Calibration 2 21 3 Use SYST ERR query to check for errors Table 2 11 Current range calibration commands Step C ommand procedure Description 1 SOUR CURR RANGE Range Select source range 2 SOUR CURR lt Range gt Establish negative polarity 3 DMM reading Read actual output value 4 CAL PROT SOUR DMM Reading Calibrate sense function negative full scale 5 Check 2400 for errors 6 CAL PROT SENS DMM Reading Calibrate source function negative full scale 7 Check 2400 for errors 8 SOUR CURR 0 0 Set output to 9 Take DMM reading Read actual output value 10 CAL PROT SOUR DMM Reading Calibrate sense function negative zero 11 Check 2400 for errors 12 CAL PROT SENS DMM Reading Calibrate source function negative zero 13 Check 2400 for errors 14 SOUR CURR lt Range gt Establish positive polarity 15 Take DMM reading Read actual output value 16 CAL PROT SOUR lt DMM_Reading gt Calibrate sense fu
85. embly Use the following steps to remove the display board and or the pushbutton switch pad 1 Unplug the display board ribbon cable 2 Remove the front panel assembly This assembly has four retaining clips that snap onto the chassis over four pem nut studs Two retaining clips are located on each side of the front panel Pull the retaining clips outward and at the same time pull the front panel assembly forward until it sepa rates from the chassis 3 Using a thin bladed screwdriver pry the plastic PC board stop located at the bottom of the display board until the bar separates from the casing Pull the display board from the front panel 4 Remove the switch pad by pulling it from the front panel Disassembly 5 7 Removing power components The following procedures for removing the power supply and or power module require that the case cover and analog board be removed as previously explained Power supply removal Perform the following steps to remove the power supply 1 Remove the analog board 2 Unplug the two cables coming from the digital board 3 Remove the four screws that secure the power supply to the bottom of the chassis 4 Remove the power supply from the chassis Power module removal Perform the following steps to remove the rear panel power module 1 Remove the analog board Unplug the cable connecting the power module to the digital board 3 Disconnect the power module s ground wire This g
86. en it has completed each step To determine when the OPC response is ready perform the following 1 Repeatedly test the Message Available bit bit 4 in the status byte and wait until it is set You can request the status byte by using the STB query 2 When MAV is set a message is available in the output queue and you can read the out put queue and test for an ASCII 1 3 After reading the output queue repeatedly test MAV again until it clears At this point the calibration step is completed Using the O PC command The OPC operation complete command can also be used to detect the completion of each calibration step In order to use OPC to detect the end of each calibration step perform the following 1 Enable operation complete by sending ESE 1 This command sets the OPC operation complete bit in the standard event enable register allowing operation complete status from the standard event status register to set the ESB event summary bit in the status byte when operation complete is detected 2 Sendthe OPC command immediately following each calibration command For example CAL PRO T SEN S 2 0 PC Note that you must include the semicolon to separate the two commands and that the OPC command must appear on the same line as the command 3 After sending a calibration command repeatedly test the ESB Event Summary bit bit 5 in the status byte until it is set Use STB to request the status byte
87. errors any calibration errors will be reported in the error queue You can read the error queue by using the SYST ERR query Error summary Table B 4 summarizes calibration errors These errors will occur under the following conditions Error 500 501 Will occur if you do not set the calibration date or calibration due date Error 502 Will occur when the CAL PROT SENS or CAL PROT SOUR command is sent with a parameter that cannot be placed into any of the defined numeric ranges Error 503 504 Will occur when the source compliance DAC calibration constants generate an invalid DAC setting All of the source compliance DAC calibration constants are verified each time a CAL PROT SOUR command is processed and when the Model 2400 is first turned on This error generally occurs when the Model 2400 source circuitry is defective Error 505 Will occur when a CAL PROT SOUR command generates an invalid source offset calibration constant Error 506 Will occur when a CAL PROT SOUR command generates an invalid source gain calibration constant Error 507 Will occur when a CAL PROT SENS command generates an invalid measurement offset calibration constant B 10 Command Reference Error 508 Will occur when a CAL PROT SENS command generates an invalid measurement gain calibration constant Table B 4 Calibration errors Errornumber Error message 500 Date of calibration not set 501 Next date of calibration not
88. essing the MENU key Select TEST and press ENTER to display the SELF TEST MENU 3 Select DISPLAY TESTS 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 will be displayed to indicate that it is functioning properly When the key is released the No keys pressed message is displayed 5 Pressing EXIT tests the EXIT key However the second consecutive press of EXIT aborts the test and returns the instrument to the SELF TEST MENU Continue pressing EXIT to back out of the menu structure DISPLAY PATTERNS test The display test allows you to verify that each pixel and annunciator in the vacuum fluorescent display is working properly Perform the following steps to run the display 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 TESTS and press ENTER to display the following menu FRONT PANEL TESTS KEYS DISPLAY PATTERNS CHAR SET 4 Select DISPLAY PATTERNS and press ENTER to start the display test There are five parts to the display test Each time a front panel key except EXIT is pressed the next part of the test sequence is selected The five parts of the test sequence are Checkerboard pattern alternate pixels on and all annunciators Checkerboard pattern and the annunciators that are on du
89. gt V ENTER or EXIT 3 Using the range keys and the left and right arrow keys enter the new password on the display 4 Once the desired password is displayed press the ENTER key to store the new password Remote password To change the calibration password via remote first send the present password and then send the new password For example the following command sequence changes the password from the KI002400 remote default to CAL CAL PRO T CO DE KI002400 CAL PRO T CO DE KI_CAL You can use any combination of letters and numbers up to a maximum of eight characters NOTE Ifyou change the first two characters of the password to something other than you will not be able to unlock calibration from the front panel Resetting the calibration password If you lose the calibration password you can unlock calibration by shorting together the CAL pads which are located on the display board Doing so will also reset the password to the factory default 1002400 See Section 5 for details on disassembling the unit to access the CAL pads Refer to the display board component layout drawing at the end of Section 6 for the location of the CAL pads Calibration 2 7 Viewing calibration dates and calibration count When calibration is locked only the UNLOCK and VIEW DATES selections will be accessible in the calibration menu To view calibration dates and calibration count at any time 1 From norm
90. he circuit may be exposed As described in the International Electrotechnical Commission IEC Standard IEC 664 digital multi meter measuring circuits e g Keithley Models 175A 199 2000 2001 2002 and 2010 are Installation Category II All other instruments signal terminals are Installation Category I and must not be connect ed to mains Do not connect switching cards directly to unlimited power circuits They are intended to be used with impedance limited sources NEVER connect switching cards directly to AC mains When connecting sources to switching cards install protective devices to limit fault current and voltage to the card Before operating an instrument make sure the line cord is connected to a properly grounded power re ceptacle Inspect the connecting cables test leads and jumpers for possible wear cracks or breaks be fore each use For maximum safety do not touch the product test cables or any other instruments while power is ap plied to the circuit under test ALWAYS remove power from the entire test system and discharge any capacitors before connecting or disconnecting cables or jumpers installing or removing switching cards or making internal changes such as installing or removing jumpers Do not touch any object that could provide a current path to the common side of the circuit under test or power line earth ground Always make measurements with dry hands while standing on a dry insulated surface ca
91. he clips off the power transistors CAUTION _ Becareful not to damage the heat sink insulation layer Remove the analog board from the subchassis Remove the four screws that secure the bottom cover and then remove the cover from the bottom of the PC board NOTE When reinstalling the heat sink make sure that all clips are properly installed and centered on each pair of output transistors 5 6 Disassembly Digital board removal Perform the following steps to remove the digital board This procedure assumes that the ana log board assembly is already removed 1 Remove the IEEE 488 Digital I O and RS 232 fasteners The IEEE 488 Digital I O and RS 232 connectors each have two nuts that secure the connectors to the rear panel Remove these nuts 2 Remove the POWER switch rod At the switch place the edge of a flat blade screwdriver in the notch on the pushrod Gently twist the screwdriver while pulling the rod from the shaft 3 Unplug cables Unplug the display board ribbon cable Unplug the cables going to the power supply Unplug the rear panel power module cable 4 Remove digital board Slide the digital board forward until it is free of the guide pins then remove the board During reassembly replace the board and start the IEEE 488 Digital I O and RS 232 connector nuts and the mounting screw Tighten all the fasteners once they are all in place and the board is correctly aligned Front panel disass
92. hen the Model 2400 receives this command it will attempt to place the parameter into one of the three parameter ranges summarized in Table B 2 depending 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 successfully selected the appropriate parameter range it will then check to see if autorange for the active SENS FUNC is enabled If so an error number 221 Settings con flict will be generated If no error occurs the active sense function range point will be calibrated using the corresponding parameter Note that parameters for a given sense function and range may be sent in any order However once one CAL PROT SENS command executes the other two must also be executed or an error number 200 Execution error will occur when the CAL PROT SAVE command is processed at the end of the calibration procedure Example CAL PROT SENS 2 Calibrate 2V sense range Table B 2 CALibration PROT ected SEN Se parameter ranges Sense First parameter Second parameter Third parameter range zero negative full scale positive full scale 0 2V 0 002 to 0 002 0 18 to 0 22 0 18 to 0 22 2V 0 02 to 0 02 1 8 to 2 2 1 8 to 422 20V 0 2 to 402 18 to 22 18 to 22 200V 2 to 2 180 to 220 180 to 220 1E 8 to IE 8 0 9E 6 to 1 1E 6 0 9E 6 to 1 1E 6 10uA 1 7 to 1E 7
93. hich value is lower the output will clamp at either the displayed compliance setting real or at the maximum measurement range reading range Performance Verification 1 7 The real compliance condition can occur when the compliance setting is less than the highest possible reading of the measurement range When in compliance the source output clamps at the displayed compliance value For example if the compliance voltage is set to 1 V and the measurement range 15 2V the output voltage will clamp limit at 1 V Range compliance can occur when the compliance setting is higher than the possible reading of the selected measurement range When in compliance the source output clamps at the maximum measurement range reading not the compliance value For example if the compliance voltage is set to 1V and the measurement range is 200mV the output voltage will clamp limit at 210mV Maximum compliance values The maximum compliance values for the measurement ranges are summarized as follows Measurement Maximum range compliance value 200mV 210mV 2V 2 1V 20V 21V 200V 210V 1uA 1 05uA 10uA 10 5uA 100uA 105uA 1mA 1 05mA 10mA 10 5mA 100mA 105mA 1A 1 05A When the SourceMeter goes into compliance the label or the units label i e mA for the compliance display will flash Determining compliance limit The relationships to determine which compliance is in effect are summarized
94. ifi edschematic 17VF o 15VF o Maindrive 15VF 0523 0525 36 17VFo t 4 8 Troubleshooting A D converter The SourceMeter unit uses a multi slope charge balance A D converter with a single slope run down The converter is controlled by gate array U610 Commands are issued by the MPU on the digital board through communications opto isolators to U610 and U610 sends A D reading data back through opto isolators to the digital board for calibration and processing Active guard The Model 2400 has an active guard or six wire ohms circuit used to measure complex devices This circuitry provides a low current 50mA equivalent of the voltage on output HI If the unit is in the SV mode the low current equivalent of the source voltage will appear on the guard terminal If the unit is in the SI mode the voltage on output HI is equal to the source cur rent multiplied by the external resistance value An equivalent voltage will be generated by the guard circuit and a guard sense terminal is provided to sense around the voltage drop in the guard leads since significant current can flow 50mA Digital circuitry Refer to Figure 4 4 for the following discussion on digital circuitry The core digital circuitry uses a Motorola 68332 microcontroller running at 16 78MHz The memory configuration includes two 256K x 8 bit EEPROMS and two 128K x 8 bit
95. instrument They must be protected from electric shock and contact with hazardous live circuits Maintenance personnel perform routine procedures on the product to keep it operating for example setting the line voltage or replacing consumable materials Maintenance procedures are described in the manual The procedures explicitly state if the operator may perform them Otherwise they should be performed only by service personnel Service personnel are trained to work on live circuits and perform safe installations and repairs of prod ucts Only properly trained service personnel may perform installation and service procedures Exercise extreme caution when a shock hazard is present Lethal voltage may be present on cable con nector jacks or test fixtures The American National 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 practic expecthahazardousoltag presentmnynknowrircuibefore neasuring Users of this product must be protected from electric shock at all times The responsible body must en sure that users are prevented access and or insulated from every connection point In some cases con nections must be exposed to potential human contact Product users in these circumstances must be trained to protect themselves from the risk of electric shock If the circuit is capable of operating at or above 1000 volts no conductive part of t
96. ion have been calculated using only the Model 2400 one year accuracy specifications and they do not include test equipment uncertainty If a particular measurement falls outside the allowable range recalculate new limits based both on Model 2400 specifications and corresponding test equipment specifications 1 4 Performance Verification Example limits calculation As an example of how verification limits are calculated assume you are testing the 20V DC output range using a 20V output value Using the Model 2400 one year accuracy specification for 20V DC output of 0 02 of output 2 4mV offset the calculated output limits are Output limits 20V 20V x 0 02 2 4mV Output limits 20V 0 004 0 0024 Output limits 20V 0 0064V Output limits 19 9936V to 20 0064V Resistance limits calculation When verifying the ohms function you may find it necessary to recalculate resistance limits based on the actual calibrator resistance values You can calculate resistance reading limits in the same manner described above but be sure to use the actual calibrator resistance values and the Model 2400 normal accuracy specifications for your calculations As an example assume that you are testing the 20kQ range and the actual value of the nominal 19k calibrator resistor is 19 025kQ Using the Model 2400 one year normal accuracy specifications of 0 063 of reading 30 the recalculated reading limits are Reading limit
97. ire procedure for each range Step 1 Prepare the Model 2400 for calibration 1 Turn on the Model 2400 and the digital multimeter and allow them to warm up for at least one hour before performing calibration Press the MENU key then choose CAL and press ENTER Select UNLOCK and then press ENTER The instrument will display the following PASSWORD Use 4 V ENTER or EXIT Use the up and down keys to select the letter or number and use the left and right arrow keys to choose the position Enter the present password on the display Front panel default 002400 Press ENTER to complete the process Press EXIT to return to normal display Instrument operating states will be set as sum marized in Table 2 2 Step 2 Voltage calibration Perform the steps below for each voltage range using Table 2 3 as a guide 1 Connect the Model 2400 to the digital multimeter as shown in Figure 2 1 Select the multimeter DC volts measurement function NOTE The 2 wire connections shown assume that remote sensing is not used Remote sens ing may be used if desired but it is not essential when using recommended digital multimeter From normal display press the SOURCE V key Press the EDIT key to select the source field cursor flashing in source display field and then use the down RANGE key to select the 200mV source range From normal display press MENU Select CAL and then press ENTER The unit will display the following
98. limits given in the table NOTE may not be possible to set the voltage source to the specified value Use the closest possible setting and modify reading limits accordingly 5 Repeat the procedure for negative source voltages with the same magnitudes as those listed in Table 1 3 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 3 Voltage measurement accuracy limits Model 2400 source and Model 2400 voltage reading limits measure range Source voltage 1 year 18 C 28 C 200mv 190 000mV 189 677 to 190 323mV 2V 1 90000V 1 89947 to 1 90053V 20V 19 0000V 18 9962 to 19 0038V 200V 190 000V 189 962 to 190 038V Measure range coupled to source range when simultaneously sourcing and measuring voltage As measured by precision digital multimeter Use closest possible value and modify reading limits accordingly if necessary Performance Verification 1 11 0 utput current accuracy Follow the steps below to verify that Model 2400 output current accuracy is within specified limits The test involves setting the output current to each full range value and measuring the currents with a precision digital multimeter 1 With the power off connect the digital multimeter to the Model 2400 INPUT OUTPUT jacks as shown in Figure 1 2 Select the multimeter DC current measuring function 3 Press the Model 2400
99. nction positive full scale 17 Check 2400 for errors 18 CAL PROT SENS lt DMM_Reading gt Calibrate source function positive full scale 19 Check 2400 for errors 20 SOUR CURR 0 0 Set output to 0A 2 Take DMM reading Read actual output value 22 CAL PROT SOUR DMM Reading Calibrate source positive zero Perform complete procedure for each range where Range 1E6 10E6 100E6 1E3 10E3 100E3 or 1 2 DMM Reading parameter is multimeter reading from previous step Send the source and sense calibration commands using the multimeter reading for the parameter For example CAL PROT SO UR 1E 6 CAL PRO T SEN S 1E 6 Set the source to the positive full range value using the SOUR CURR command For example for the ImA range SOU R CURR 1E3 Note and record the multimeter reading Send the source and sense commands using the multimeter reading as the parameter For example CAL PROT SO UR 1 03E 3 CAL PRO T SEN S 1 03E 3 Send the SOUR CURR 0 0 command to set the source current to OA 2 22 Calibration Note and record the multimeter reading Send the CAL PROT SOUR command using the multimeter reading as the com mand parameter For example CAL PROT SO UR 1 02E 3 Step 4 Program calibration dates Use the following commands to set the calibration date and calibration due date CAL PRO T DATE year month day Calibration date CAL PRO
100. nd calibration Program C 2 E uesting calibration count 2 7 constants Voltage accurac 1 6 limit readback Voltage measurement accuracy limits Recommended calibration E meni 2 4 Recommended test equipment Recommended verification equipment 1 3 W Remote calibration 2 16 Warm up period 1 2 command summar procedure 2 18 Service Form Model No Serial No Date Name and Telephone No 2 Company List all control settings describe problem and check boxes that apply to problem I Intermittent Analog output follows display Particular range or function bad specify L IEEE failure Q Obvious problem on power up L Batteries and fuses are OK L Front panel operational 1 All ranges or functions are bad Q Checked all cables Display or output check one Drifts Q Unable to zero Unstable Q Overload Q Will not read applied input Q Calibration only I Certificate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement including all instruments connected whether power is turned on or not Also describe signal source Where is the measurement being performed factory controlled laboratory out of doors etc What power line voltage is used Ambient temperature F Relative humidity Other Any additional information If special modifications have been made by the user pleas
101. nd positive full scale Similarly each source range requires four parameters two zero parameters a positive full scale parameter and a negative full scale parameter For a more complete description of these commands refer to Appendix B Table 2 5 Remote calibration command summary Command Description CALibration Calibration subsystem PROTected Cal commands protected by password CODE lt password gt Unlock cal changes password if cal is already unlocked Default password KI002400 COUNT Query number of times 2400 has been calibrated SAVE Save calibration data to EEPROM LOCK Lock calibration inhibit SAVE command operation LOCK Request cal lock status DATE lt y gt lt m gt lt d gt Program calibration year month day DATE Query calibration year month day NDUE lt y gt lt m gt lt d gt Program calibration due year month day NDUE Query calibration due year month day SENSe lt nrf gt Calibrate active measure range See Table 2 6 parameters DATA Query measurement cal constants for active range SOURce lt nrf gt Calibrate active source range See Table 2 7 parameters DATA Query source cal constants for active range Calibration data will not be saved if 1 Calibration was not unlocked with CODE command 2 Invalid data exists For example cal step failed or was aborted 3 Incomplete number of cal steps were performed For example omitting a negative full scale
102. o allow the test equipment to warm up for the minimum time specified by the manufacturer Line power The Model 2400 requires a line voltage of 88 to 264V and a line frequency of 50 or 60Hz Performance Verification Verification tests should be performed within this range Recommended test equipment 1 3 Table 1 1 summarizes recommended verification equipment You can use alternate equipment as long as that equipment has specifications at least as good as those listed in Table 1 1 Keep in mind however that test equipment uncertainty will add to the uncertainty of each measure ment Generally test equipment uncertainty should be at least four times better than corre sponding Model 2400 specifications Table 1 1 lists the uncertainties of the recommended test equipment Table 1 1 Recommended verifi cation equipment Description Manufacturer Model Accuracy Digital Multimeter Hewlett Packard DC Voltage 200mV 15 HP3458A 2V 6ppm 20V 9ppm 200V 7ppm DC current 1pA 55ppm 10uA 25ppm 100uA 23ppm 1mA 20ppm 10mA 20ppm 100mA 35ppm 1A 110ppm Resistance calibrator Fluke 5450A Resistance 190 23ppm 1900 10 5ppm 1 9kQ 8 19kQ 7 5ppm 190kQ 8 5 1 9MQ 11 5ppm 19MQ 30ppm 100MO 120ppm 90 day specifications show accuracy at specified measurement point Nominal resistance values shown Verification limits The verification limits stated in this sect
103. oard block diagram ROM RAM U15 U12 U16 U14 Serial RS 232 Reset 1 eek Interface 3 EPROM Microprocessor GPIB U17 U3 06 013 IEEE 488 2 U20 2 Interface A D A D ES Control D ata 3 Interface 7 U9 U25 4 L 5 To Display Board Controller lt 16 78MHz Voltage source Trigger 7 K gt Trigger U23 Digital y WO K gt igital U7 1 0 DS901 is the VFD vacuum fluorescent display module which can display up to 49 characters Each character is organized as a 5 X 7 matrix of dots or pixels and includes a long under bar segment to act as a cursor The display uses a common multiplexing scheme with each character refreshed in sequence U903 and U904 are the grid drivers and U901 and U905 are the dot drivers Note that dot driver and grid driver data is serially transmitted from the microcontroller PD3 and PC1 The VFD requires both 60VDC and 5VAC for the filaments These VFD voltages are supplied by U625 which is located on the digital board The front panel keys S901 S931 are organized into a row column matrix to minimize the number of microcontroller peripheral lines required to read the keyboard A key is read by strobing the columns and reading all rows for each strobed column Key down data is inter preted by the display microcontroller and sent back to the main microprocessor using propri etary encoding schemes 4 10 Troubleshooting Troubleshooting Troubleshooting information
104. ock Active low input Handler Interface Start of test end of test 3 category bits 45V 9 300mA supply Digital 1 0 1 trigger input 4TTL Relay Drive outputs 33V 9 500mA sink diode clamped POWER SUPPLY 88V to 264V rms 50 60Hz automatically detected at power up WARRANTY 1 year EMC Conforms with European Union Directive 89 336 EEC EN 55011 EN 50082 1 EN 61000 3 2 and 61000 3 3 FCC part 15 class B SAFETY Conforms with European Union Directive 73 23 EEC EN 61010 1 UL 3111 1 VIBRATION MIL T 28800E Typelll Class 5 WARM UP 1 hour to rated accuracies DIMENSIONS 89mm high x 213mm wide x 370mm deep 3 in x 8 x 1471 in Bench Configuration with handle amp feet 104mm high x 238mm wide x 370mm deep 4 in x 97 in x 1476 in WEIGHT 3 21kg 7 08 Ibs ENVIRONMENT Operating 0 50 C 70 R H up to 35 C Derate 3 R H C 35 50 C Storage 25 C to 65 C 1 Except lowest 2 current ranges 90dB Specifications subject to change without notice A 6 Specifications 2400 C SPECIFICATIONS SOURCE SPECIFICATIONS Voltage Programming Accuracy remote sense Accuracy 1 Year Noise Programming 23 C 45 C peak peak Range Resolution rdg volts 0 1Hz 10Hz 200 000mV 5 0 02 600 uV 5 uv 2 00000 V 50 0 02 600 uV 50 uV 20 0000 V 500 uV 0 02 2 4 mV 500 uV 200 000 V 5 mv 0 02 24mV 5mv TEMPERATURE COEFFICIENT 0 18 C 28 50 C 40 15 x accuracy specification C
105. only with the same or equivalent type recommended by the manufacturer Dispose of used batteries according to manufacturer s instructions WARNING The precautions below must be followed to avoid personal injury Wear safety glasses or goggles when working with lithium batteries Do not short the battery terminals together Keep lithium batteries away from all liquids Do not attempt to recharge lithium batteries Observe proper polarity when inserting the battery in its holder Do not incinerate or otherwise expose the battery to excessive heat gt 60 C Bulk quantities of lithium batteries should be disposed of as a hazardous waste To replace the battery first locate its holder Use a small non metallic tool to lift the battery so that it can be slid out from under the retainer spring clip The new battery should be reinstalled with the terminal facing up Lift up on the retaining clip and place the edge of the battery under the clip Slide the battery full into the holder Re assemble the instrument and turn it on The Reading buffer data lost error message will be displayed Send the syst mem init command to perform the following Clear the reading buffer Initialize instrument setups 1 4 to the present instrument settings Initialize all 100 source memory locations to the present instrument settings Delete user math expressions Troubleshooting 4 13 No comm link error A No Comm Link er
106. ple CAL PROT SO UR 1E 3 CAL PRO T SEN S 1E 3 Set the source to the positive full range value using the SOUR VOLT command For example SOUR VOLT 2 Note and record the multimeter reading 2 20 Calibration Send the source and sense commands using the multimeter reading as the parameter For example CAL PRO T SOUR 1 997 CAL PRO T SEN S 1 997 Send the SOUR VOLT 0 0 command to set the source voltage to OV Note and record the multimeter reading Send the CAL PROT SOUR command using the multimeter reading as the com mand parameter For example CAL PROT SO UR 1 02E 3 Step 3 Current Calibration 1 Connect the Model 2400 to the digital multimeter see Figure 2 2 and select the multi meter DC current function 2 Send the commands summarized in Table 2 10 in the order listed to initialize current calibration Table 2 10 Current calibration initialization commands Command Description SOUR FUNC CURR Select source current mode SENS VOLT PROT 20 Voltage limit when current source is active SENS VOLT RANG 20 Make sure 200V range is not active OUTP STAT ON Turn source on 3 Calibrate each current range using the procedure summarized in Table 2 11 For each range Send the SOUR CURR RANG command to select the source and sense range being calibrated For example for the range the command is SOUR CURR RANG 1E 3 Program the source to output the n
107. r will flash in the source field while its value is being edited 3 With the cursor in the source display field flashing set the source range to the lowest possible range for the value to be sourced using the up or down RANGE key For exam ple you should use the 20V source range to output a 19V or 20V source value With a 20V source value and the 20V range selected the source field display will appear as follows Vsre 20 0000 V 4 With the source field cursor flashing set the source output to the required value using either The SOURCE adjustment and left and right arrow keys The numeric keys 5 Note that the source output value will be updated immediately you need not press ENTER when setting the source value Setting the measurement range When simultaneously sourcing and measuring either voltage or current the measure range is coupled to the source range and you cannot independently control the measure range Thus it is not necessary for you to set the range when testing voltage or current measurement accuracy Compliance considerations Compliance limits When sourcing voltage you can set the SourceMeter to limit current from 1nA to 1 05A Conversely when sourcing current you can set the SourceMeter to limit voltage from 200uV to 210V The SourceMeter output will not exceed the programmed compliance limit Types of compliance There are two types of compliance that can occur real and range Depending upon w
108. r string including letters and numbers Description The CODE command sends the password and enables calibration when performing these procedures via remote The correct password must be sent to the unit before sending any other calibration command The default remote password is KI002400 Note The CODE command should only be sent once before performing cali bration Do not send CODE before each calibration step To change the code first send the present code then send the new code The password parameter must be enclosed in single quotes If you change the first two characters of the password to something other than KI you will not be able to unlock calibration from the front panel Example CAL PROT CODE KI002400 Send default code of KI002400 COUNT CALibration PRO Tected CO UNT Purpose To request the number of times the Model 2400 has been calibrated Format cal prot count Response Number of times calibrated Description The COUNT query may be used to determine the total number of times the Model 2400 has been calibrated Example CAL PROT COUNT Request calibration count B 4 Command Reference LO CK CALibration PRO Tected LO CK Purpose Format Query Response Description Note Example SAVE To lock out calibration cal protilock cal protilock 0 Calibration unlocked 1 Calibration locked The LOCK command lets you lock out comprehensive calibration after comple
109. ranges using Table 2 3 as a guide Be sure to select the appropriate source range with the EDIT and RANGE keys before calibrating each range Press EXIT as necessary to return to normal display Table 2 3 Front panel voltage calibration Source range Source voltage Multimeter voltage reading Calibration 0 2V 2V 20V 200V 200 00mV 000 00mV 200 00mV 000 00mV 2 0000V 0 0000V 2 0000V 0 0000V 20 000V 00 000V 20 000V 00 000V 200 00V 000 00V 200 00V 000 00V lt lt lt lt lt lt lt lt lt lt lt lt Use EDIT and RANGE keys to select source range Multimeter reading used in corresponding calibration step See procedure 2 11 2 12 Calibration Step 3 Current calibration Perform the following steps for each current range using Table 2 4 as a guide 1 Connect the Model 2400 to the digital multimeter as shown in Figure 2 2 Select the multimeter DC current measurement function From normal display press the SOURCE I key 3 Press the EDIT key to select the source display field and then use the down RANGE key to select the 1uA source range From normal display press MENU 5 Select CAL and then press ENTER The unit will display the following CALIBRATION UNLOCK EXECUTE VIEW D ATES p gt SAVE LOCK CHANGE PASSW O RD 6 Select EXECUTE and then press ENTER The instrument will display the following message I CAL Press ENT
110. re contamination could cause degraded performance Handling PC boards Observe the following precautions when handling 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 Use dry nitrogen gas to clean dust off PC boards Solder repairs Observe the following precautions when you must solder a circuit board Use an OA based organic activated flux and take care not to spread the flux to other areas of the circuit board Remove the flux from the work area when you have finished the repair by using pure water with clean foam tipped swabs or a clean soft brush Once you have removed the flux swab only the repair area with methanol then blow dry the board with dry nitrogen gas After cleaning allow the board to dry in a 50 C low humidity environment for several hours Disassembly 5 3 Static sensitive devices CMOS devices operate at very high impedance levels Therefore any static that builds up on you or your clothing may be sufficient to destroy these devices if they are not handled properly Use the following precautions to avoid damaging them CAUTION Many CMOS devices are installed in the Model 2400 Handle all semicon ductor devices as being static sensitive Transport and handle ICs only in containers specially designed to prevent static build up Typically
111. re performing calibration 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 Typically allow one extra hour to stabilize a unit that is 10 C 18 F outside the specified temperature range Also allow the test equipment to warm up for the minimum time specified by the manufacturer Line power The Model 2400 requires a line voltage of 88 to 264V at line frequency of 50 or 60Hz The instrument must be calibrated within this range Calibration 2 3 Calibration considerations When performing the calibration procedures Make sure that the test equipment is properly warmed up and connected to the Model 2400 front panel INPUT OUTPUT jacks Also be certain that the front panel jacks are selected with the TERMINALS switch Always allow the source signal to settle before calibrating each point Do not connect test equipment to the Model 2400 through a scanner or other switching equipment If an error occurs during calibration the Model 2400 will generate an appropriate error message See Appendix B for more information WARNING common mode voltage voltage between LO and chassis ground is 250V peak Exceeding this value may cause a breakdown insulation creating a shock hazard CAUTION voltage between INPUT OUTPUT HI and LO or 4 WIRE SENSE HI an
112. reen and yellow wire connects to a threaded stud on the chassis with a kep nut 4 Squeeze the latches on either side of the power module while pushing the module from the access hole WARNING To avoid electrical shock which could result in injury or death the ground wire of the power module must be connected to chassis ground W hen installing the power module be sure to reconnect the green and yellow ground wire to the threaded stud on the chassis Instrument reassembly Reassemble the instrument by reversing the previous disassembly procedures Make sure that all parts are properly seated and secured and that all connections are properly made To ensure proper operation replace and securely fasten the shield WARNING ensure continued protection against electrical shock verify that power line ground green and yellow wire attached to the power module is con nected to the chassis Also make certain that the two bottom case screws are properly installed to secure and ground the case cover to the chassis 5 8 Disassembly 6 Replaceable Parts 6 2 Replaceable Parts Introduction This section contains replacement parts information and component layout drawings for the Model 2400 Parts lists The electrical parts lists for the Model 2400 are shown in the tables at the end of this section For part numbers to the various mechanical parts and assemblies use the Miscellaneous parts list and the assembly drawings provid
113. removal Front panel disassembly Removing power components Power supply removal Power module removal eee Instrument reassembly eese Replaceable Parts Introd etiofi ua a u u paa p REN ua Saa nn Ordering information use Factory Service Component layouts Specifications Accuracy calculations A 10 Measure un nennen A 10 SOUTEE seele A 10 Command Reference Introduction u Command summary Miscellaneous commands Detecting calibration errors Reading the error queue sene Error summary nente enne Status byte EAV Error Available bit Generating an SRQ on error sse Detecting calibration step completion Using the OPC query ettet U
114. removed 1 Remove analog board shield Remove the screw that secures the shield to the analog board then remove the shield 2 Disconnect the front and rear input terminals You must disconnect these input terminal connections for both the front and rear inputs INPUT OUTPUT HI and LO 4 WIRE SENSE HI and LO V GUARD and GUARD SENSE rear panel only Disassembly 5 5 Remove all the connections by pulling the wires off the pin connectors During reassembly use the following table to identify input terminals Front wire color Rear wire color INPUT OUTPUT HI Red White Red INPUT OUTPUT LO Black White Black 4 WIRE SENSE HI Yellow White Yellow 4 WIRE SENSE LO Gray White Gray V Q GUARD White GUARD SENSE Blue White 3 Unplug cables Carefully unplug the ribbon cables at J1001 J1002 and J1003 Unplug the ON OFF cable at J1034 4 Remove screws Remove the two fastening screws that secure the analog board assembly to the chassis These screws are located on the side of the board opposite from the heat sink Remove the two screws that secure the heat sink to the chassis 5 Remove analog board assembly After all screws have been removed carefully lift the analog board assembly free of the main chassis 6 Disassemble analog board assembly Remove the screws that secure the analog board and heat sink to the analog board subchassis Carefully remove the heat sink by sliding t
115. ring normal operation 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 selected digit are on 5 When finished abort the display test by pressing EXIT The instrument returns to the SELF TEST MENU Continue pressing EXIT to back out of the menu structure 4 4 Troubleshooting 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 Select TEST and press ENTER to display the SELF TEST MENU 3 Select DISPLAY TESTS and press ENTER to display the following menu FRONT PANEL TESTS KEYS DISPLAY PATTERNS CHAR SET 4 Select CHAR SET and press ENTER to start the character set test Press any key except EXIT to cycle through all displayable characters 5 When finished abort the character set test by pressing EXIT The instrument returns to the SELF TEST MENU Continue pressing EXIT to back out of the menu structure Principles of operation The following information is provided to support the troubleshooting tests and procedures cov ered in this section of the manual Refer to the following drawings Figure 4 1 Analog circuitry overall block diagram Figure 4 2 Power supply block diagram Figure 4 3 Output stage simplified schematic Figure 4 4 Digital
116. ror indicates that the front panel processor has ceased communication with the main processor which is located on the digital board This error indicates that one of the main processor ROMs may require re seating in its socket ROMs may be reseated as follows 1 Turn off the power and disconnect the line cord and all other test leads and cables from the instrument Remove the case cover as outlined in Section 5 3 Remove the analog shield and analog board assembly as outlined in Section 5 Locate the two firmware ROMs U15 and U16 located on the digital board These are the only ICs installed in sockets Refer to the component layout drawing at the end of Section 6 for exact locations 5 Carefully push down on each ROM IC to make sure it is properly seated in its socket CAUTION _ Becareful not to push down excessively or you might crack the digital board 6 Connect the line cord and turn on the power If the problem persists additional trouble shooting will be required 4 14 Troubleshooting Disassembly 5 2 Disassembly Introduction This section explains how to handle clean and disassemble the Model 2400 Disassembly drawings are located at the end of this section Handling and cleaning To avoid contaminating PC board traces with body oil or other foreign matter avoid touching the PC board traces while you are repairing the instrument Analog circuits have high impedance devices or sensitive circuitry whe
117. s 19 025kQ4 19 025kQ x 0 063 30 Reading limits 19 025kQ 150 Reading limits 19 0100k to 19 0400kQ Restoring factory defaults Before performing the verification procedures restore the instrument to its factory front panel bench defaults as follows 1 Press MENU key The instrument will display the following prompt MAIN MENU SAVESETUP COMMUNICATION CAL 2 Select SAVESETUP and then press ENTER The unit then displays SETUP MENU SAVE RESTORE POWERON RESET 3 Select RESET and then press ENTER The unit displays RESET ORIGINAL DFLTS BENCH GPIB 4 Select BENCH and then press ENTER The unit then displays RESETTIN G INSTRU M ENT EN TER to confirm EXIT to abort 5 Press ENTER to restore bench defaults and note the unit displays the following RESET COM PLETE BENCH defaults are now restored p gt Press ENTER to continue 6 Press ENTER and then EXIT to return to normal display Performance Verification 1 5 Performing the verification test procedures Test summary DC voltage output accuracy DC voltage measurement accuracy DC current output accuracy DC current measurement accuracy Resistance measurement accuracy If the Model 2400 is not within specifications and not under warranty see the calibration procedures in Section 2 for information on calibrating the unit Test considerations When performing the verification procedures Be sure to restore factory front panel def
118. set 502 Calibration data invalid 503 DAC calibration overflow 504 DAC calibration underflow 505 Source offset data invalid 506 Source gain data invalid 507 Measurement offset data invalid 508 Measurement gain data invalid Status byte EAV Error Available bit Whenever an error is available in the error queue the EAV Error Available bit bit 2 of the status byte will be set Use the STB query to obtain the status byte then test bit 2 to see if it is set If the EAV bit is set an error has occurred and you can use the appropriate error query to read the error and at the same time clear the EAV bit in the status byte Generating an SRQ on error To program the instrument to generate an IEEE 488 bus SRQ Service Request when an error occurs send the SRE 4 command This command will enable SRQ when the EAV bit is set You can then read the status byte and error queue as outlined above to check for errors and to determine the exact nature of the error Command Reference B 11 D etecting calibration step completion When sending remote calibration commands you must wait until the instrument completes the present operation before sending another command You can use either OPC or OPC to help determine when each calibration step is completed Using the O PC query With the OPC operation complete query the instrument will place an ASCII 1 in the output queue wh
119. sing the OPC command esee Generating an SRQ on calibration complete Calibration Programs Introduction neuen Computer hardware requirements Software requirements Calibration equipment General program instructions Program C 1 Model 2400 calibration program Requesting calibration constants Program C 2 Requesting calibration constants List of Illustrations 1 Performance Verification Figure 1 1 Voltage verification front panel connections Figure 1 2 Current verification connections Figure 1 3 Resistance verification connections 2 Calibration Figure 2 1 Voltage calibration connections Figure 2 2 Current calibration connections 2 12 3 Routine Maintenance Figure 3 1 cruza 3 3 4 Troubleshooting Figure 4 1 Analog circuit block diagram Figure 4 2 Power supply block diagram Figure 4 3 Output stage simplified schematic Figure 4 4 Digital board block diagram
120. splay to agree with the actual DMM reading Note that the display value adjustment limits are within 1 of the present range After adjusting the display value to agree with the DMM reading press ENTER The unit will then display the following V CAL Press ENTER to Output 200 00mV 2 10 Calibration 13 14 15 16 17 18 19 20 21 Press ENTER The Model 2400 will source 200mV and display the following DMM RDG 200 0000mV Use 4 V ENTER or EXIT Note and record the DMM reading and then adjust the Model 2400 display to agree with the DMM reading Again the maximum display adjustment is within 10 of the present range After adjusting the display value to agree with the DMM reading press ENTER and note that the instrument displays V CAL Press ENTER to Output 000 00mv Press ENTER The Model 2400 will source OmV and simultaneously display the following DMM RDG 000 0000mV Use 4 V ENTER or EXIT Note and record the DMM reading and then adjust the display to agree with the DMM reading Once again the maximum adjustment is within 1 of the present range After adjusting the display to agree with the DMM reading press ENTER to complete calibration of the present range Press EXIT to return to normal display and then select the 2V source range Repeat steps 2 through 18 for the 2V range After calibrating the 2V range repeat the entire procedure for the 20V and 200V
121. tates listed in Table 2 2 Table 2 8 Voltage calibration initialization commands Command Description RST Restore GPIB defaults SOUR FUNC VOLT Activate voltage source SENS CURR PROT 0 1 Current limit when voltage source is active SENS CURR RANG 0 1 Make sure 1A range is not active SOUR VOLT PROT LEV MAX Maximum allowable source voltage SYST RSEN OFF Disable remote sensing CAL PROT CODE 1002400 Unlock cal OUTP STAT ON Turn source on Remote sensing may be used if desired but is not essential when using recommended digital multimeter 3 Perform the range calibration steps listed in Table 2 9 for each range For each range Send the SOUR VOLT RANG command to select the source and sense range being calibrated For example for the 2V range the following command would be sent SOUR VOLT RANG 2 Program the source to output the negative full range value using the SOUR VOLT command For example SOUR VOLT 2 Note and record the multimeter reading Calibration 2 19 Table 2 9 Voltage range calibration commands Step C ommand procedure Description 1 SOUR VOLT RANGE Range Select source range 2 SOUR VOLT lt Range gt Establish negative polarity 3 DMM reading Read actual output value 4 CAL PROT SOUR DMM Reading Calibrate source function negative full scale 5 Check 2400 for errors 6 CAL PROT SENS DMM Reading Calibrate sense fun
122. the Front Panel Tests be performed prior to any disassembly The disassembly instruc tions for the Model 2400 are contained in Section 5 of this manual Do not make repairs to surface mount PC boards unless equipped and qualified to do so see previous CAUTION When working inside the unit and replacing parts be sure to adhere to the handling pre cautions and cleaning procedures explained in Section 5 Many CMOS devices are installed in the Model 2400 These static sensitive devices require special handling as explained in Section 5 Whenever a circuit board is removed or a component is replaced the Model 2400 must be recalibrated See Section 2 for details on calibrating the unit Power on self test During the power on sequence the Model 2400 will perform a checksum test on its ROM and test its RAM If the RAM tests fails the instrument will lock up If the ROM checksum test fails the firmware upgrade mode is automatically enabled See Firmware upgrades at the end of this section Troubleshooting 4 3 Front panel tests There are three front panel tests one to test the functionality of the front panel keys and two to test the display In the event of a test failure refer to Display board checks for details on trou bleshooting the display board KEYS test The KEYS test allows you to check the functionality of each front panel key Perform the fol lowing steps to run the KEYS test 1 Display the MAIN MENU by pr
123. ting those procedures Thus LOCK performs the opposite of send ing the password with the CODE command The LOCK query returns calibration lock status To unlock calibration send the CODE command with the appropriate pass word PROT LOCK Lock out calibration CALibration PRO Tected SAVE Purpose Format Description Note Example To save calibration constants in EEROM after the calibration procedure cal prot save The SAVE command stores internally calculated calibration constants derived during comprehensive in EEROM EEROM is non volatile memory and calibration constants will be retained indefinitely once saved Generally SAVE is sent after all other calibration steps except for LOCK Calibration will be only temporary unless the 5 AVE command is sent to permanently store calibration constants Calibration data will not be saved if 1 calibration was not unlocked by sending the CODE command 2 invalid data exists for example cal step failed or was aborted or 3 an incomplete number of cal steps were performed for example omitting a negative full scale step CAL PROT SAVE Save calibration constants Command Reference B 5 DATE CALibration PRO Tected D ATE Purpose To program the calibration date Format cal prot date year month day Parameter year 1995 to 2094 lt month gt to 12 day 1 to 31 Query cal prot date Response year month
124. tings conflict will be generated If no error occurs the active source function range point will be calibrated using the corresponding parameter Note that parameters for a given source function and range may be sent in any order However once one CAL PROT SOUR command executes the other three must also be executed or an error number 200 Execution error will occur when the CAL PROT SAVE command is processed at the end of the calibration procedure Because the source is calibrated for both positive and negative values two zero calibration points are required The Model 2400 automatically uses the appropriate zero parameter based on whether the source polarity is positive or negative Example CAL PROT SOUR 2 Calibrate 2V source range B 8 Command Reference Table B 3 CALibration PROT ected SO U Rce parameter ranges First parameter Second parameter Third parameter Fourth parameter Source range negative full scale negative zero positive full scale positive zero 0 2V 0 18 to 0 22 0 002 to 0 002 0 18 to 0 22 0 002 to 0 002 2V 1 8 to 2 2 0 02 to 0 02 41 8 to 422 0 02 to 0 02 20V 18 to 22 0 2 to 0 2 18 to 22 0 2 to 0 2 200V 180 to 220 2 to 2 180 to 220 2 to 2 0 9E 6 to 6 1E 8 to 1E 8 0 9E 6 to 1 1E 6 1E 8 to 1E 8 10uA 9E 6 to 11E 6 1E 7 to 1E 7 9E 6 to 11E 6 1E 7 to 1E 7 100uA 90E 6 to 110E 6 1E 6 to 1E 6 90E 6 to 110E 6 1E 6 to
125. tions as follows of reading offset 0 015 x 10V ImV 1 5mV ImV 2 5mV Accuracy Thus the actual reading range is 10 2 5mV or from 9 9975 to 10 0025V DC current measurement calculations are performed in exactly the same manner using the pertinent specifications ranges and input signal values Source accuracy Source accuracy is calculated similarly except source specifications are used As an example of how to calculate the actual source output limits assume that you are sourcing 0 7mA on the I mA source range You can compute the reading limit range from source current one year accuracy specifications as follows 0 034 of output 200nA offset 0 034 x 0 7mA 200nA 238nA 200nA 438nA Accuracy In this case the actual current output range is 0 7mA 438nA or from 0 69956mA to 0 70044mA Command Reference B 2 Command Reference Introduction This appendix contains detailed information on the various Model 2400 remote calibration commands calibration error messages and methods to detect the end of each calibration step Section 2 of this manual covers detailed calibration procedures Command summary Table B 1 summarizes Model 2400 calibration commands These commands are covered in detail in the following paragraphs Table B 1 Remote calibration command summary Command Description CALibration Calibration subsystem PROTected Cal commands protected
126. troduction kenn Repair considerations Powe rson self test 1 2 m RI EI teeth Front panel tests esse IG Mr DISPLAY PATTERNS CHAR SET ro PH takashaspa Principles of operation Analog Power SUpply Output stage ise eree reine Ea ne EEE E A D GOBNeT ISE u Actveg ard MP Disit l cite ltty een a Troubleshooting i Display board checks eene Power supply checks eene Digital circuitry checks Analog circuitry checks Battery 2 552 No comm hk error Disassembly lien m Handling and cleaning Handling PC boards esee Solder een Static sensitive devices Assembly drawings Case COVer removal Analog board removal Digital board
127. ts source range output voltage setting 1 year 18 C 28 C 200mV 200 000mV 199 360 to 200 640mV 2V 2 00000V 1 99900 to 2 00100V 20V 20 0000V 19 9936 to 20 0064V 200V 200 000V 199 936 to 200 064V 1 10 Performance Verification Voltage measurement accuracy Follow the steps below to verify that Model 2400 voltage measurement accuracy is within specified limits The test involves setting the source voltage to 95 of full range values as measured by a precision digital multimeter and then verifying that the Model 2400 voltage readings are within required limits 1 With the power off connect the digital multimeter to the Model 2400 INPUT OUTPUT jacks as shown in Figure 1 1 2 Select the multimeter DC volts function NOTE The default voltage source protection value is 40V Before testing the 200V range set the voltage source protection value to gt 200V To do so press CONFIG then SOURCE V to access the CONFIGURE V SOURCE menu then select PROTEC TION and set the limit value to gt 200V 3 Setthe Model 2400 to both source and measure voltage by pressing the SOURCE V and MEAS V keys and make sure the source output is turned on 4 Verify output voltage accuracy for each of the voltages listed in Table 1 3 For each test point Select the correct source range Set the Model 2400 output voltage to the indicated value as measured by the digital multimeter Verify that the Model 2400 voltage reading is within the
128. ts NPLC 1 0 SENS VOLT NPLC 1 0 Sense Volts Range Source V SENS VOLT RANG source V range Sense Current NPLC 1 0 SENS CURR NPLC 1 0 Sense Current Range Source I SENS CURR RANG source I range Filter Count 10 SENS AVER COUN 10 Filter Control REPEAT SENS AVER TCON REPeat Filter Averaging ON SENS AVER STAT ON Source V Mode FIXED SOUR VOLT MODE FIXED Volts Autorange OFF SOUR VOLT RANGE AUTO OFF Source I Mode FIXED SOUR CURR MODE FIXED Current Autorange OFF SOUR CURR RANGE AUTO OFF Autozero ON SYST AZERO ON Trigger Arm Count 1 ARM COUNT 1 Trigger Arm Source Immediate ARM SOUR IMMediate Trigger Count 1 TRIG COUNT 1 Trigger Source Immediate TRIG SOUR IMMediate Remote calibration password To unlock calibration via remote send the following command CAL PROT CO DE lt password gt For example the following command uses the default password CAL PRO T CO DE KI002400 2 6 Calibration Changing the password The default password may be changed from the front panel or via remote as discussed in the following paragraphs Front panel password Follow the steps below to change the password from the front panel 1 Press the MENU key then choose CAL and press ENTER The instrument will display the following CALIBRATIO N UNLOCK EXECUTE VIEW D ATES lt q SAVE LOCK CHANGE PASSW 0 RD 2 Select CHANGE PASSWORD and then press ENTER The instrument will display the following NEW PWD 002400 Use lt

Model 2400SourceMeter® Service Manual

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Model 2400SourceMeter® Service Manual