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Keithley Service Manual 2700: englisch

1. Figure 1 11 Figure 1 11 Connections for Model 7700 AC current verification Model 7700 Calibrator Output AC Current Output lt e oo Q Output LO 2 Install the Model 7700 in Slot 1 of the Model 2700 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the AC current function by pressing the ACI key Set the Model 2700 for the 1A range Close Channel 21 by pressing the CLOSE key and keying in 121 5 Source 1A and full scale AC currents as summarized in Table 1 12 and ver ify that the readings are within stated limits 6 Press the OPEN key to open Channel 21 Table 1 12 Plug in module ACI limits ACV range Applied AC voltage Reading limits 1kHz 1 year 18 C to 28 C 1A 1 000000A 0 99860 to 1 00140A 3A 3 00000A 2 9937 to 3 0063A Tf the Fluke 5725A amplifier is not available apply 2 2A from the calibrator Reading limits for 2 2A are 2 1949 to 2 2051A Performance Verification 1 25 V
2. CH1 E Output Ol 66 Model 7700 Calibrator Output AC Voltage Shielded LO Cable Performance Verification 1 21 2 Install the Model 7700 in Slot 1 of the Model 2700 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the AC volts function by pressing the ACV key Close Channel 1 by pressing the CLOSE key and then keying in 101 Set the Model 2700 for the 100mV range make sure that REL is disabled 5 Source 2 and 50kHz AC voltages for each of the ranges summarized in Table 1 10 and make sure that the respective Model 2700 readings fall within stated limits 6 Press the OPEN key to open Channel 1 Table 1 10 Plug in module ACV reading limits ACV Applied AC 1kHz reading limits 50kHz reading limits range voltage 1 year 18 C to 28 C 1 year 18 C to 28 C 100mV 100 0000mV 99 910 to 100 090mV 99 830 to 100 170mV 1V 1 000000V 0 99910 to 1 00090V 0 99830 to 1 00170V 10V 10 00000V 9 9910 to 10 0090V 9 98300 to 10 0170V 100V 100 0000V 99 910 to 100 090V 99 830 to 100 170V 750V 300 000V 299 60 to 300 40V 299 27 to 300 73V Tf the 5725A amplifier is not available
3. OoOoooo oO CJ as 000 010 ooo oo SENSE Cee OO III OHMS 4 will f Output LO Note Use shielded cables to minimize noise 1 32 Performance Verification Calibration 2 2 Calibration Introduction Use the procedures in this section to calibrate the Model 2700 Calibration procedures include e Comprehensive calibration Usually the only calibration required in the field Manufacturing calibration Usually only performed at the factory unless the unit has been repaired Model 7700 calibration Covers calibration procedures specific to Model 7700 cards WARNING The information in this section is intended only for qualified service per sonnel Do not attempt these procedures unless you are qualified to do so All the procedures require accurate calibration equipment to supply precise DC and AC volt ages DC and AC currents and resistance values Comprehensive calibration can be performed any time by an operator either from the front panel or by using the SCPI commands sent either over the IEEE 488
4. O Note Use shielded cables to minimize noise Disable calibrator external sense mode Table 1 13 Limits for plug in module resistance verification Nominal resis Nominal reading limits Performance Verification 1 27 Q Range tance 1 year 18 C to 28 C Recalculated limits 1000 10090 99 9884 to 100 0116 2 to Q IkQ IkQ 0 999894 to 1 000106kQ to 10kQ 10kQ 9 99894 to 10 00106kQ to kQ 100kQ 100kQ 99 9890 to 100 0110kQ to kQ IMQ IMQ 0 999890 to 1 0001 10MQ to MQ 10MQ 10MQ 9 99590 to 10 00410MQ to MQ 100MQ 100MQ 99 5770 to 100 4230MQ to MQ Enable OCOMP for 1000 range Calculate limits based on actual calibration resistance values and Model 2700 one year resistance accuracy specifications See Verification limits Verifying temperature Thermocouple thermistor and RTD temperature readings are derived from DC volts and resistance measurements respectively For that reason it is not necessary to independently ver ify the accuracy of temperature measurements As long as the DC volts and resistance functions meet or exceed specifications temperature function accuracy is automatically verified How ever temperature verification procedures are provided below for those who wish to separately verify temperature accuracy Thermocouple temperature
5. 2 Perform the calibration steps summarized in Table 2 6 For each step e Set the calibrator to the indicated value and make sure the calibrator is in OPERATE e Press ENTER to complete each step Wait until the Model 2700 completes each step Table 2 6 AC voltage calibration summary Calibration step Calibrator voltage frequency 10 00000mV 1kHz 100 0000mV 1kHz 10mV AC at 1kHz 100mV AC at 1kHz 700V AC at 1kHz 100mV AC at 50kHz 100 0000mV 50kHz 1V AC at IKHz 1 000000V 1kHz 1V AC at 50kHz 1 000000V 50kHz 10V AC at 1kHz 10 00000V 1kHz 10V AC at 50kHz 10 00000V 50kHz 100V AC at IKHz 100 0000V 1kHz 100V AC at 50kHz 100 0000V 50kHz 700 000V 1kHz 2 12 Calibration AC current calibration After the 700VAC at 1kHz point has been calibrated the unit will prompt you for 100mA at 1kHz Follow these steps for AC current calibration 1 Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2700 as shown in Figure 2 3 Perform the calibration steps summarized in Table 2 7 For each step Set the calibrator to the indicated current and frequency and make sure the unit is in OPERATE Press ENTER to complete each calibration step Allow the unit to complete each step before continuing Table 2 7 AC current calibration summary Calibration step Calibrator current frequency
6. pom Uem S l ognooog a i lt al D Come Quem Gir gt 910 Ge X2 PES il 11 aj Function Output 1 18 Performance Verification Model 7700 verification Use these procedures to verify measurement accuracy through the Model 7700 20 Channel Multiplexer Card NOTE Although the following tests are based on the Model 7700 20 Channel Multiplexer the same general procedures can be used for other plug in modules that have similar capabilities Refer to the Model 2700 User s Manual for specific information on ter minals and connections for other plug in modules Verifying DC voltage Check DC voltage accuracy by applying accurate voltages from the DC voltage calibrator to the Model 7700 input terminals and verifying that the displayed readings fall within specified limits CAUTION not exceed 300V DC between plug in module INPUT and L termi nals or between any adjacent channels Follow these steps to verify DC voltage accuracy 1 Connect the Model 7700 CH1 and L INPUT terminals to the DC voltage calibrator as shown in Figure 1 8 NOTE Use shielded low thermal connections when testing the 100 and 1V ranges to avoid errors caused by noise or thermal effects Connect the shield to the calibr
7. Disassembly Input terminal wire colors Power module wire colors Replaceable Parts Model 2700 display board Model 7700 parts list Model 7702 parts list Model 7703 parts list Model 7705 parts list Model 2700 motherboard parts list parts list iced Model 2700 connector board parts list Model 2700 miscellaneous parts list sss Calibration Reference Remote calibration command summary DC calibration commands AC calibration commands Model 7700 calibration Command Calibration error summary Performance Verification 1 2 Performance Verification Introduction Use the procedures in this section to verify that Model 2700 Multimeter Data Acquisition System 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 ship ment and that the unit meets factory specifications If the instrument s accuracy is questionable Following calibration WARNING The information in this section is intended only for qualified service per NOTE sonnel Do not attempt these procedures unless you are qualified to do so
8. Table B 2 DC calibration commands Command Description Parameter limits CALibration PROTected DC STEP 1 Front terminal short circuit STEP2 Open circuit 5 lt NRf gt 10V DC calibration step 9 to 11 STEPA lt NRf gt 10 DC calibration step 9 to 11 5 5 lt NRf gt 100V DC calibration step 90 to 110 STEP6 lt NRf gt 1kQ 4 wire calibration step 900 to 1 1E3 5 7 lt NRf gt 10kQ 4 wire calibration step 913 to 11E3 5 8 lt NRf gt 100kQ 4 wire calibration step 90E3 to 110E3 5 9 lt NRf gt IMQ 4 wire calibration step 900E3 to 1 1E6 5 10 lt NRf gt 10mA DC calibration step 9E 3 to 11E 3 STEPI11 lt NRf gt 100mA DC calibration step 90E 3 to 110E 3 STEP12 lt NRf gt 1A DC calibration step 0 9 to 1 1 STEP CALibration PROTected DC STEP1 Purpose To perform front terminal short circuit calibration Format cal prot dc stepl Parameter None Description STEP1 performs the short circuit calibration step in the comprehensive calibration procedure Connect a low thermal short Model 8610 to the front panel input jacks before sending this command Example CAL PROT DC STEP1 Perform short circuit calibration Calibration Reference B 9 STEP2 CALibration PROTected DC STEP2 Purpose To perform front terminal open circuit calibration Format cal prot dce step2 Parameter None Description STEP2 performs the open circuit calibration step in the
9. M Verification test requirements essere Environmental conditions 2 Warm Up period 35 52 orte hn eter Recommended test equipment Verification limits Example reading limit calculation Calculating resistance reading limits Restoring factory defaults sese Performing the verification test procedures Verification test summary esee Test considerations eee Model 2700 verification Verifying DC voltage I Verifying AC voltage Verifying DC current Verifying AC current eese Verifying resistance eene tereti eerie ite n teret sise Verifying temperature essere Verifying frequency Model 7700 verification 2 4 Verifying DG voltage Verifying AC voltage Verifying DC current Verifying AC current Verifying
10. Sense LO Sense LO Note Use shielded low thermal cables to minimize noise Enable or disable calibrator external sense as indicated in procedure NOTE Although 4 wire connections are shown the sense leads are connected and discon nected at various points in this procedure by turning calibrator external sense on or off as appropriate If your calibrator does not have provisions for turning external sense on and off disconnect the sense leads when external sensing is to be turned off and connect the sense leads when external sensing is to be turned on 2 Setthe calibrator to output DC volts and turn external sense off Calibration 2 9 3 Perform the steps listed in Table 2 3 to complete DC volts calibration For each calibra tion step Set the calibrator to the indicated value and make sure it is in OPERATE Press the ENTER key to calibrate that step e Wait until the Model 2700 finishes each step The unit will display the CALIBRATING message while calibrating NOTE lfyour calibrator cannot output the values recommended in Table 2 3 use the left and right arrow keys and the up and down range keys to set the Model 2700 display value to match the calibrator output voltage Table 2 3 DC volts calibration summary Calibration step Calibrator voltage Allowable range 10V 10 00000V 9V to 11V 10V 10 00000V 9V to 11V 100V 100 0000V 90V to 110V Resistance calibration
11. o aoaaada 2 500 Coax Cable ix Iw AH 57 Iz YO Function Model 7700 Output Verifying ratio and average Follow the procedure below to verify ratio and average CAUTION Exceeding 300V between plug in module INPUT or SENSE and L ter minals may cause instrument damage 1 Connect the Model 7700 CH1 and CH11 and L terminals to the DC calibrator as shown in Figure 1 16 2 Install the Model 7700 in Slot 1 of the Model 2700 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the Model 2700 DCV function and the 1V range Close Channel 1 by pressing the CLOSE key and keying in 101 Performance Verification 1 31 Select the Model 2700 RATIO function press SHIFT then RATIO Set the calibrator output to 1 00000V DC and allow the reading to settle Verify that the ratio reading is between 0 9999926 and 1 000074 Press OPEN to open Channel 1 LES UA Figure 1 16 Connections for Model 7700 ratio and average verification CH1 Xe Model 7700 He L s LH DC Voltage Calibrator ow ge ge gno I Output INPUT V 2 WIRE V4 afe eec 1 4 ee c e
12. S LO NOTE sure to connect the low thermal short properly to the HI LO and SENSE termi nals Keep drafts away from low thermal connections to avoid thermal drift which could affect calibration accuracy 2 8 Calibration 2 Press ENTER to start short circuit calibration While the unit is calibrating it will display CALIBRATING 3 When the unit is finished with short circuit calibration it will display the following prompt OPEN CIRCUIT 4 Remove the calibration short and press ENTER During this phase the CALIBRATING message will be displayed NOTE Be sure to minimize movement near front Input terminals Excessive movements can cause capacitive coupling errors which could affect calibration accuracy DC volts calibration After the front panel short and open procedure the unit will prompt you for the first DC voltage 10V Do the following 1 Connect the calibrator to the Model 2700 as shown in Figure 2 2 Wait three minutes to allow for thermal equilibrium before proceeding Figure 2 2 Connections for DC volts and ohms calibration Sense HI Sense DC Voltage and Resistance Calibrator Model 2700 C MATH OUTPUT RATIO CHAVG CONT OCOMP PERIOD SENSOR 0000000 Ou C D gt V 4 or Ot 209 Oc JOO
13. Figure 1 3 Connections for Model 2700 DC current verification Figure 1 4 Connections for Model 2700 AC current verification Figure 1 5 Connections for Model 2700 resistance verification 1000 to 10M amp ranges 1 13 Figure 1 6 Connections for Model 2700 resistance verification 100M amp range 21 Figure 1 7 Connections for Model 2700 frequency verification l Figure 1 8 Connections for Model 7700 DC volts verification Figure 1 9 Connections for Model 7700 AC volts verification Figure 1 10 Connections for Model 7700 DC current verification Figure 1 11 Connections for Model 7700 AC current verification Figure 1 12 Connections for Model 7700 resistance verification 1000 to 10 9 ranges Figure 1 13 Connections for Model 7700 resistance verification 100M amp range Figure 1 14 Connections for Model 7700 thermocouple temperature verification 1 28 Figure 1 15 Connections for Model 7700 frequency verification 1 30 Figure 1 16 Connections for Model 7700 ratio and average verification 2 Calibration Figure 2 1 Low thermal short connections eee Figure 2 2 Connections for DC volts and ohms calibra
14. esee Temperatures erm tr Optimizing measurement speed DC voltage DC current and resistance AC voltage and AC current sese Temperature 3 eorom eno e rt tien Calibration Reference Introduction SE Command essem Miscellaneous calibration commands Manufacturing calibration commands sess PACES TERIA ttes torret rette ete eere Reiter DOS EDO E Remote error reporting Error SUfDmaty 11e Error queue ret re Status byte EAV Error Available bit Generating an SRQ on error Detecting calibration step completion Using the Query reete Using the OPC command eee Generating an SRQ on calibration complete Calibration Program Introduction nre rrt 6 Computer hardware requirements Software requirements 2 Calibration equipment seen General program instructions esee List of Illustrations 1 Performance Verification Figure 1 1 Connections for Model 2700 DC volts verification Figure 1 2 Connections for Model 2700 AC volts verification
15. Use only grounded tip soldering 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 following assembly drawings to assist you as you disassemble and reassemble the Model 2700 Also refer to these drawings for information about the Keithley part numbers of most mechanical parts in the unit The drawings are located at the end of this section of the manual e Front Panel Assembly 2700 040 Card Cage Power Module Assembly 2700 050 e Power Module Transformer Chassis Assembly 2700 051 e Front Panel Card Cage Chassis Assembly 2700 052 e Chassis Assembly 2700 053 2700 054 Final Inspection 2700 080 5 4 Disassembly Disassembly procedures 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 Remove Handle The handle serves as an adjustable tilt bail 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 Remove Mounting Ears
16. Use the information in Table 5 2 and DETAIL B of drawing 2700 050 to connect power module wires Table 5 2 Power module wire colors Power module wire connections Location Wire color Right side Gray Right top Violet Left top White Right bottom Red Left bottom Blue 5 8 Disassembly 6 Replaceable Parts 6 2 Replaceable Parts Introduction This section contains replacement parts information and component layout drawings for the Model 2700 Model 7700 Model 7702 Model 7703 and Model 7705 NOTE For additional information about the Keithley modules refer to the appropriate appendix in the Model 2700 User s Manual Parts lists Both electrical and mechanical parts for the Model 2700 are listed in several tables on the following pages For additional information on mechanical parts see the assembly drawings provided 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 2700 Instrument serial number Part description Component designation if applicable e Keithley part number Factory service If the instrument is to be returned to Keithley Instruments for repair perform the following Call the Repair Department at
17. Range Applied DC voltage Reading limits 1 year 18 to 28 C 100mV 100 0000mV 99 9935 to 100 0065mV IV 1 000000V 0 999963 to 1 000037V 10V 10 00000V 9 99965 to 10 00035V 100V 100 0000V 99 9946 to 100 0054V 1000V 1000 000V 999 931 to 1000 069V Source positive and negative values for each range Verifying AC voltage Check AC voltage accuracy by applying accurate AC voltages at specific frequencies from the AC voltage calibrator to the Model 2700 inputs and verifying that the displayed readings fall within specified ranges CAUTION Do not exceed 1000V peak between front terminals INPUT and INPUT LO or 8 x 107 VeHz input because instrument damage may occur Follow these steps to verify AC voltage accuracy 1 Connect the Model 2700 HI and LO INPUT jacks to the AC voltage calibrator as shown in Figure 1 2 Be sure the INPUTS switch is in the FRONT position Figure 1 2 Connections for Model 2700 AC volts verification Amplifier Connect to calibrator Note Amplifier required only for 700V 50kHz output 000000 Input HI Model 2700 Wn Output HI Output Shielded cable 0 P Calibrator Output AC Voltage 1 10 Performance Verification 2 Select the AC volts function by pressing the ACV key 3 Setthe Model
18. Thus the actual reading accuracy is 1OmV 36mV or 10 036mV to 9 964mV Applying the voltage reading accuracy into the dB equation yields dBm 220 og EV _59 968794B 10V dBm 20 5 60 031334 Thus the actual reading accuracy is 60dB 0 031213dB to 60dB 0 031326dB dBm and dB for other voltage inputs can be calculated in exactly the same manner using pertinent specifications ranges and other reference voltages Additional derating factors In some cases additional derating factors must be applied to calculate certain accuracy val ues For example an additional derating factor of 0 02ppm V must be added to DCV specifica tions for voltages over 500V Before calculating accuracy study the associated specifications very carefully to see if any derating factors apply Optimizing measurement accuracy The configurations listed below assume that the multimeter has had factory setups restored DC voltage DC current and resistance e Select 6 1 2 digits 10 PLC filter ON up to 100 readings fixed range e Use REL DC voltage and 2 wire resistance measurements e Use 4 wire resistance measurements for best accuracy AC voltage and AC current e Select 6 1 2 digits 10 PLC filter ON up to 100 readings fixed range Temperature e Select 6 1 2 digits 10 PLC filter ON up to 100 readings Specifications 15 Optimizing measurement speed The configurations listed below assume that the multi
19. 1 Connect the DC voltage calibrator output terminals and ice point reference to the Model 7700 CH1 H and L INPUT terminals using low thermal shielded connections as shown in Figure 1 14 2 Install the Model 7700 in Slot 1 of the Model 2700 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the temperature function by pressing the TEMP key Close Channel 1 by press ing the CLOSE key and keying in 101 4 Configure the Model 2700 for C units type K temperature sensor and internal refer ence junction as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C If necessary use the cursor and range keys to select C units b Press ENTER The unit then displays the sensor type SENS TCOUPLE Make sure that TCOUPLE is displayed then press ENTER The unit displays the thermocouple type TYPE J d Selecta type temperature sensor then press ENTER The unit then displays the reference junction type JUNC SIM e Select INT reference junction then press ENTER 1 28 Performance Verification 5 Source each of the voltages summarized in Table 1 14 and verify that the temperature readings are within limits Be sure to select the appropriate thermocouple type for each group of readings See step 3 above Open Channel 1 after the test is complete Table 1 1
20. 1 0 7 1 0 82 100mA 70ppm 2 2 682 1kQ 12ppm 10 5 10V 82ppm 1A 110ppm 10kQ 1 100V 7ppm 100 90 2 2 94 100kQ 13ppm 1000 9 700 85 1MQ 18ppm 10MQ 37ppm 100MQ 120ppm Fluke 5725A Amplifier Keithley 3930A or 3940 Frequency Synthesizer 1V RMS 10V RMS 5ppm steady state and burst modulation General Radio 1433 T Precision Decade Resistance Box 10Q to 400Q 0 02 Miscellaneous Equipment Double banana plug to double banana plug shielded cables 2 BNC to double banana plug shielded cable NOTE The Fluke 5725A amplifier is necessary only if you wish to verify the 750V AC range at 50kHz and 3A AC and DC current ranges at 3A Verification at 220V 50kHz and 2 2A on the current ranges using only the 5700A calibrator is adequate for most applications Performance Verification 1 5 Verification limits The verification limits stated in this section have been calculated using only the Model 2700 one year accuracy specifications and they do not include test equipment uncertainty If a par ticular measurement falls slightly outside the allowable range recalculate new limits based on both Model 2700 specifications and pertinent calibration equipment specifications Example reading limit calculation The following is an example of how reading limits have been calculated Assume you are testing the 10V DC range using a 10V
21. 100mA at 1kHz 100 0000mA 1kHz at 1kHz 1 000000 1kHz 2A at 1kHz 2 000000A 1kHz Setting calibration dates and saving calibration At the end of the calibration procedure the instrument will display the CALIBRATION COMPLETE message Press ENTER to continue and the Model 2700 will prompt you to enter the calibration date and the calibration due date Set these dates as follows 1 At the CAL DATE prompt use the left and right arrow keys and the range keys to set the calibration date then press ENTER The unit will then prompt you to enter the next calibration due date with this prompt CAL NDUE Use the left and right arrow keys and the range keys to set the calibration due date then press ENTER The unit will prompt you to save new calibration constants with this message SAVE CAL YES To save the new constants press ENTER If you do not want to save the new constants press the down range key to toggle to NO then press ENTER NOTE Calibration constants calculated during the present calibration procedure will not be saved unless you choose the YES option Previous calibration constants will be retained if you select NO Calibration 2 13 Remote calibration Follow the steps in this section to perform comprehensive procedures via remote See Appendix B for a detailed list and description of remote calibration commands When sending calibration commands be sure that the Model 2700 completes each step
22. month 1 to 12 day gt 1 to 31 Query format cal prot date Response year month day Description The DATE command allows you to store the calibration date in instrument memory for future reference You can read back the date from the instru ment over the bus by using the DATE query or the CALIBRATION selection in the front panel CAL menu NOTE The year month and day parameters must be delimited by commas Example CAL PROT DATE 1999 12 16 Send cal date 12 16 1999 CAL PROT DATE Request cal date NDUE CALibration PROTected NDUE Purpose To send the next calibration due date to the instrument Format cal prot ndue year month day Parameter year 1999 to 2098 month 1 to 12 day 1 to 31 Query format 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 from the instrument over the bus by using the NDUE query or the front panel CAL menu NOTE The next due date parameters must be delimited by commas Example CAL PROT NDUE 2000 12 16 Send due date 12 16 2000 CAL PROT NDUE Request due date B 8 Calibration Reference DC calibration commands The DC commands perform calibration of the DCV DCI and ohms functions Table B 2 summarizes these calibration commands along with parameter limits
23. Remove the screw that secures each mounting ear Pull down and out on each mounting ear NOTE When re installing the mounting ears make sure to mount the right ear to the right side of the chassis and the left ear to the left side of the chassis Each ear is marked RIGHT or LEFT on its inside surface Remove Rear Bezel To remove the rear bezel loosen the two captive screws that secure the rear bezel to the chassis Pull the bezel away from the case Removing Bottom Screws Remove the four bottom crews that secure the case to the chassis Remove Cover To remove the case grasp the front bezel of the instrument and care fully slide the chassis forward Slide the chassis out of the metal case Motherboard removal Perform the following steps to remove the motherboard This procedure assumes that the case cover is already removed 1 Remove the IEEE 488 RS 232 and Digital I O fasteners The IEEE 488 RS 232 and Digital I O connectors each have two nuts that secure the connectors to the rear panel Remove these nuts Remove the front rear 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 Disassembly 5 5 3 Disconnect the front input terminals You must disconnect these input terminal connections e INPUT HI and LO SENSE HI and LO e AMPS Remove all the connections except the front A
24. Access the calibration menu by pressing SHIFT then TEST then use the up or down range key to display TEST CALIB Press ENTER and note that the instrument dis plays the following CAL DATES Use the up or down range key to scroll through the available calibration items until the unit displays RUN then press ENTER The Model 2700 then prompts you to enter a code CODE 000000 The factory default code is 002700 Use the left and right arrow keys to move among the digits use the up range key to increment numbers and press the down range key to specify alphabetic letters Confirm the code by pressing ENTER The Model 2700 allows you to define a new calibration code Use the up and down range keys to toggle between yes and no Choose N if you do not want to change the code Choose Y if you want to change the code The unit then prompts you to enter a new code Enter the code and press ENTER Remote calibration code If you are performing calibration over the IEEE 488 bus or the RS 232 port send this com mand to unlock calibration CAL PROT CODE lt 8 character string gt The default code command is CAL PROT CODE K1002700 To change the code via remote simply send the CAL PROT CODE command twice first with the present code then with the new code Calibration 2 5 Comprehensive calibration The comprehensive calibration procedure calibrates the DCV DCI ACV ACI and ohms functions You can also choose
25. Completing the 100V DC calibration step ends the DC voltage calibration procedure The Model 2700 will then prompt you to connect 1kQ Follow these steps for resistance calibration 1 Set the calibrator output for resistance and turn on external sense NOTE Use external sense 4 wire when calibrating all resistance ranges Be sure that the calibrator external sense mode is turned on 2 Perform the calibration steps summarized in Table 2 4 For each step Set the calibrator to the indicated value and place the unit in operate If the cali brator cannot output the exact resistance value use the Model 2700 left and right arrow keys and the range keys to adjust the Model 2700 display to agree with the actual calibrator resistance Press the ENTER key to calibrate each point Wait for the Model 2700 to complete each step before continuing Table 2 4 Ohms calibration summary Calibration step Calibrator resistance Allowable range 1kQ 1kQ 0 9kQ to 1 1kQ 10kQ 10kQ 9kQ to 11kQ 100kQ 100kQ 90kQ to 110kQ IMO IMQ 0 9MQ to 1 1MQ Nominal resistance Adjust Model 2700 calibration parameter to agree with actual value 2 10 Calibration DC current calibration After the 1MQ resistance point has been calibrated the unit will prompt you to apply 10mA Follow these steps for DC current calibration 1 Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2700 as shown in Figure 2 3 Fig
26. Control from main processor 7 U401 PIN 33 Brief pulse train when front panel Key down data sent to main processor key is pressed Power supply checks Power supply problems can be checked using Table 4 3 Table 4 3 Power supply checks Step Item component Required condition Remarks 1 Line fuse Check continuity Remove to check 2 Line voltage 120V 240V as required Check power module position 3 Line power Plugged into live receptacle power on Check for correct power up sequence 4 0144 pin 3 5V 5 5VD referenced to Common 5 10101 pin7 37 5 37 referenced to Common 6 10125 pin 3 15 7V 5 15 referenced to Common 2 7 10119 pin3 15 7V 5 15V referenced to Common A 8 U124 pin 3 5V 5 5VRL referenced to Common A TP106 C148 negative terminal 4 12 Troubleshooting Digital circuitry checks Digital circuit problems can be checked using Table 4 4 Table 4 4 Digital circuitry checks Step Item component Required condition Remarks Power on test RAM OK ROM OK Verify that RAM and ROM are functional 2 U152 pin 16 Digital common All signals referenced to digital common 3 0171 pin 16 5V 5VD supply Digital logic supply 4 UI71 pin 15 5V 5VB supply Battery backed memory supply 5 0171 pin 4 43V Battery voltage BT100 6 0135 pin 48 Low on power up then goes high MPU RESET line 7 10135 lines Al
27. DATA DATA DATA DATA DATA DATA OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT 10 1 KHZ AC STEP1 100 MV 1 KHZ AC STEP2 100 MV 50 KHZ AC STEP3 1 1 KHZ AC STEP4 1 V 50 KHZ AC STEP5 10 V 1 KHZ AC STEP6 10 V 50 KHZ AC STEP7 100 V 1 KHZ AC STEP8 100 V 50 KHZ AC STEP9 700 1 KHZ AC STEP10 100 MA 1 KHZ AC STEP11 1 1 KHZ AC STEP12 2 1 KHZ AC STEP13 Index Assembly drawings B battery replacement C Calibration 2 1 DC STEPO calibration INIT aborting oc et AC current 2 LOCK B 6 B 19 AC voltage NDUE code comprehensive considerations cycle 2 5 DC a STEP10 DC STEPI1 12 front panel STEPI2 front panel short and open STEP2 B 9 Model 7700 STEP3 9 preparing the Model 2700 2 6 STEP4 9 recommended equipment STEPS B 10 Remote Model TORB STEP6 B 10 resistance 2 9 STEP7 B 10 setting dates and saving 2 12 STEPS B 11 step completion STEPO B 11 calibration code front panel Symbols remote 2 4 OPC command commands OPC query 23 018 manufacturing miscellaneous B 4 AC calibration commands B 13 Model 7700 AC rer lia Calibration error summary AC current A 14 Calibration Program C 1 verifying Model gie Calibration equipment AC voltage A 14 14 14 Computer hardware requirements C 2 verifying 2 LS General instructions verifyin
28. MMBD914 RF 83 CR2 CR21 CR25 DIODE DUAL SWITCHING BAV99L RF 82 F1 F2 FUSE 3A FU 107 1 Jl CONN RT ANGLE DUAL ROW RECEPT CS 1065 1 K1 K21 K24 K25 K26 K27 SINGLE COIL LATCH RELAY RL 225 K22 K23 NON LATCHING RELAY RL 242 QI N CHANNEL P CHANNEL POWER MOSFET TG 360 02 04 TRANS PNP SILICON TG 388 Q3 Q6 049 050 TRANS NPN SILICON TG 389 034 36 38 40 42 44 46 7 TRANS PNP SILICON TG 388 Q35 37 39 41 43 45 47 48 TRANS NPN SILICON TG 389 Q5 P CHANNEL TMOSFET TG 392 Q8 10 12 14 16 18 20 22 24 26 28 30 32 TRANS PNP SILICON TG 388 Q9 11 13 15 17 19 21 23 25 27 29 31 33 TRANS NPN SILICON TG 389 RI RES 69 8K 1 IW THICK FILM R 418 69 8K R10 R11 R12 RES 4 7K 5 125MW METAL FILM R 375 4 7K R108 R109 R110 R111 R3 R150 RES 1 100MW THICK FILM R 418 1K R13 R14 RES 3 01K 1 125MW METAL FILM R 391 3 01K R15 R54 R58 R59 RES 4 22K 1 125MW METAL FILM R 391 4 22K R2 RES 10K 1 100MW THICK FILM R 418 10K R4 R5 R6 R7 RES 2 21K 1 125mW METAL FILM R 391 2 21K R8 RES 1K 5 125MW METAL FILM R 375 1K R9 RES 1K 5 125MW METAL FILM R 375 1K R55 R56 R57 RES 470 5 125MW METAL FILM R 375 470 R60 R61 RES 4 22K 196 125MW METAL FILM R 391 4 22K R62 R63 RES 137 1 125MW METAL FILM R 391 137 R64 R65 R66 R67 R68 R69 R70 R71 RES 499 1 100MW THICK FILM R 418 499 101 110 122 CONN 4 JOLO 125 04 115 4 121 CONN 6 PIN TE 115 6 U1 U2 U3 U4 U8 IC 8 STAGE SHIFT STORE MC14094BD IC 772 UILUI2
29. ON OFF OFF xl 10MQ 34 then 57 ON OFF OFF xl 100MQ 34 then 57 ON OFF OFF xl 4 17 Figure 4 3 provides a block diagram of the analog circuitry Table 4 17 shows where the var 1005 switching devices are located in the block diagram Table 4 17 Switching device locations Switching devices Analog circuit section see Figure 4 3 Q101 Q102 Q114 Q136 Q109 K101 Q113 Q105 Q104 Q108 Q121 K102 U103 U105 U111 U133 Q120 Q123 Q124 Q125 Q126 K103 U129 U163 SSP Solid State Protection DCV Divider DCV and Ohms Switching Sense LO AC switching and Gain Ohms I Source Current Shunts A D Mux and Gain 4 18 Troubleshooting No comm link error A Comm Link error indicates that the front panel processor has ceased communication with the main processor which is located on the motherboard This error indicates that there may be a problem with the cable connection from the front panel display or one of the main processor ROMs may require reseating in its socket Check to be sure there is a proper cable connection from the front panel display 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 Find the two firmware ROMs U156 U157 located on the motherboard These the only ICs installed in sockets Re
30. S6 57 that are selected for measurement during the SIGNAL phase of the multiplexing cycle Also included are switching states of analog switches U129 that set up the gain for the final ampli fier stage U166 Table 4 12 DCV signal multiplexing and gain Signal U129 U129 U129 Gain Range U163 pin 1 pin 8 pin 9 U166 100mV S4 OFF OFF ON x100 IV 34 OFF ON OFF x10 10V 34 ON OFF OFF xl 100V 34 OFF ON OFF x10 1000V 34 ON OFF OFF xl Table 4 13 ACV and ACA signal multiplexing and gain Signal U129 U129 U129 Gain Range U163 pin 1 pin 8 pin 9 U166 All 33 ON OFF OFF xl Table 4 14 DCA signal multiplexing and gain Signal U129 U129 U129 Gain Range U163 pin 1 pin 8 pin 9 U166 20mA S6 OFF OFF ON x100 100mA S6 OFF OFF ON x100 1A S6 OFF OFF ON x100 3A S6 OFF ON OFF x10 Troubleshooting Table 4 15 Q2 signal multiplexing and gain Signal U129 U129 U129 Gain Range U163 pin 1 pin 8 pin 9 U166 1000 54 OFF OFF ON x100 1kQ S4 OFF ON OFF x10 10kQ S4 OFF ON OFF x10 100kQ S4 OFF ON OFF x10 IMQ S4 ON OFF OFF xl 10MQ S4 ON OFF OFF xl 100MQ S4 ON OFF OFF xl Table 4 16 24 signal multiplexing and gain Signal U129 U129 U129 Gain Range U163 pin 1 pin 8 pin 9 U166 100Q S4 then S7 OFF OFF ON x100 1kQ 34 then 57 OFF ON OFF x10 10kQ 34 then 57 OFF ON OFF x10 100kQ 34 then 57 OFF ON OFF x10 IMQ S4 then 57
31. before sending the next command You can do so either by observing the front panel CALI BRATING message or by detecting the completion of each step over the bus See Detecting calibration step completion in Appendix B The procedures for calibrating the Model 2700 via remote include Preparing the Model 2700 for calibration Front panel short and open calibration DC volts calibration Resistance calibration DC current calibration AC volts calibration AC current calibration Programming calibration dates Saving calibration constants Locking out calibration NOTE As with front panel calibration you can choose to perform comprehensive DC only or AC only calibration Be sure to include a space character between each command and parameter Preparing the Model 2700 for calibration 1 Connect the Model 2700 to the IEEE 488 bus of the computer using a shielded IEEE 488 cable such as the Keithley Model 7007 or connect the unit to a computer through the RS 232 port using a straight through 9 pin to 9 pin cable use a 9 25 pin adapter if necessary Turn on the Model 2700 and allow it to warm up for at least two hours before perform ing calibration Make sure the primary address of the Model 2700 is the same as the address specified in the program that you will be using to send commands Use the GPIB key Unlock the calibration function by sending this command CAL PROT CODE K1002700 The above command shows the de
32. see Handling PC boards Solder repairs oet ege peret Static sensitive devices Assembly drawings etii eene Disassembly procedures Case cover removal Motherboard removal eene ds Card cage removal seen Front panel disassembly see Removing power components eee de Instrument reassembly eene Input terminal wire connections Power module wire connections Replaceable Parts Introduction urne eerie orem s Parts lists ae aire Ordering information Factory SerVIG6 oie rere e eerie Component layouts eie Specifications Accuracy calculations Calculating DC characteristics accuracy Calculating AC characteristics accuracy Calculating dBm characteristics accuracy Calculating dB characteristics accuracy Additional derating factors Optimizing measurement accuracy DC voltage DC current and resistance AC voltage and AC current
33. send the CLS command to clear the status registers Note that sending CLS will also clear the error queue and operation complete status Generating an SRQ on calibration complete An IEEE 488 bus SRQ service request can be used to detect operation complete instead of repeatedly polling the Model 2700 To use this method send both ESE 1 and SRE 32 to the instrument then include the OPC command at the end of each calibration command line as covered above Refer to your controller s documentation for information on detecting and ser vicing SRQs Calibration Program C 2 Calibration Program Introduction This appendix includes a calibration program written in BASIC to help you calibrate the Model 2700 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 program BM PC AT or compatible computer Keithley KPC 488 2 5 488 2 or KPC 488 2AT 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 program you will need the following software e 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 e
34. 125VA maxi an mum Channels 41 42 60V DC or 30V rms 3A switched 60W 125VA maximum Chana a CONTACT LIFE typ 2105 operations at max signal level 2108 operations cold switching CONTACT RESISTANCE lt Q at end of contact life CONTACT POTENTIAL lt 500nV typical per contact 14V max lt 500 typical per contact pair 14V max OFFSET CURRENT lt 100 CONNECTOR TYPE Screw terminal 20 AWG wire size ISOLATION BETWEEN ANY TWO TERMINALS gt 10 00 lt LOOpF ISOLATION BETWEEN ANY TERMINAL AND EARTH gt 10 0 lt 200pF CROSSTALK 10MHz 500 Load lt 4008 INSERTION LOSS 500 Source 500 Load 0 1dB below 1M Hz lt 3dB below 2MHz COMMON MODE VOLTAGE 300V between any terminal and chassis ENVIRONMENTAL OPERATING ENVIRONMENT Specified for 0 C to 50 C Specified to 80 R H at 35 C STORAGE ENVIRONMENT 25 C to 65 C WEIGHT 0 5kg 1 110 Channel 45 Channels 43 45 in this schematic refer to the designations used for control and not actual available channels For more information refer to the ROUTe MULTiple command section the Model 2700 User s Manual Channels 44 and 45 can be individually controlled using ROUTe MULTipleifthe moduleisnotto be connected to the internal DMM A 10 Specifications 7703 32 Channel High Speed Differential Multiplexer GENERAL 32 CHANNELS 32 channels of 2 pole relay input All ch
35. 4 Model 7700 calibration commands Command Description CALibration Calibration root command PROTected All commands in this subsystem are protected by the calibration lock except queries and CODE lt up to 8 char string gt Send calibration code Default KI002700 CARDI Path to card in slot 1 INITiate Initiate card calibration COUNt Request number of times card had been calibrated RCOunt Reset card calibration count to 0 DATE Request card cal date SAVE Save cal constants to card EEPROM LOCK Lock out calibration LOCK Request cal lock state 0 locked 1 unlocked 5 lt NRf gt Temperature sensor cold calibration lt NRf gt temperature C CARD2 Path to card in slot 2 COUNt Request number of times card has been calibrated DATE Request card calibration date Calibration Reference B 17 CODE CALibration PROTected CODE Purpose To program the calibration code or password so that you can perform the Model 7700 calibration procedures Format cal prot code char string Parameter Up to a 8 character string including letters and numbers Description The CODE command enables the Model 2700 calibration procedures when performing these procedures over the bus This command must be sent to the unit before sending any other Model 7700 calibration command The default calibration code is KI002700 NOTES The CODE command should be sent only once befor
36. 90 to 110 but 100 is recommended for best results CAL PROT DC STEP5 100 Program 100V step CALibration PROTected DC STEP6 Purpose Format Parameter Description Example STEP7 To program the 1kQ 4 wire comprehensive calibration step cal prot dc step6 Cal resistance Cal resistance 900 to 1 1E3 Q STEP6 programs the 1kQ 4 wire resistance comprehensive calibration step The allowable range of the calibration resistance parameter is from 900 to 1 1E3 but 1E3 is recommended for best results CAL PROT DC STEP6 1E3 Program 1KQ step CALibration PROTected DC STEP7 Purpose Format Parameter Description Example To program the 10kQ 4 wire comprehensive calibration step cal prot dc step7 Cal resistance Cal resistance 9E3 to 1113 Q STEP7 programs the 10kQ 4 wire resistance comprehensive calibration step The allowable range of the calibration resistance parameter is from 9E3 to 1 1E3 but 10E3 is recommended for best results CAL PROT DC STEP7 10E3 Program 10kQ step Calibration Reference B 11 STEPS CALibration PROTected DC STEP8 Purpose To program the 100kQ 4 wire comprehensive calibration step Format cal prot dc step8 lt Cal_resistance gt Parameter Cal resistance 90E3 to 110 3 Description STEP8 programs the 100kQ 4 wire resistance comprehensive calibration step The allowable range of the calibration resistance parameter is from 90E3 to 1 10E3 but
37. AC voltage command summary DC current DC volts Locking out calibration preparing the Model 2700 2 13 Programming calibration dates resistance 2 15 Saving calibration constants 2 18 short and open Remote error reporting Repair considerations Replaceable Parts resistance A 14 verifying Model 2700 verifying Model 7700 RS 232 interface Safety Precautions Scanner card signals Signal switching Solder repairs Specifications Static sensitive devices 5 3 Status byte EAV Error Available bit Switching device locations Temperature temperature RTD Model 2700 RTD Model 7700 thermocouple Model 2700 1 15 thermocouple Model 7700 verifying Model 2700 verifying Model 7700 Trigger circuits Troubleshooting verification Model 2700 Model 7700 Verification limits Verification test considerations Model 2700 Model 7700 summary 1 6 verification test procedures 1 6 Verification test requirements verifying AC current Model 7700 W2 signal multiplexing and gain 4 17 W2 signal switchin of 4 14 W2 W4 reference switching W4 signal multiplexing and gain W4 signal switching 4 14 Warm up period calibration Verification Procedures Service Form Model No Serial No Date Company List all control settings describe problem and check boxes that apply to problem Q Intermittent Analog output follows display Q Particular range or f
38. ACV and FREQ signal switching 0103 U103 0105 U105 0103 U103 0105 0111 Range 0101 0102 101 K102 pin8 pin9 pin9 pin8 pin16 pin1 pin1 pin 16 100mV RESET RESET ON ON OFF OFF OFF ON ON OFF 1V ON RESET RESET ON ON OFF OFF ON OFF OFF OFF 10V ON JON RESET SET OFF OFF ON OFF OFF ON ON OFF 100 RESET SET OFF OFF ON OFF ON OFF OFF OFF 750 RESET SET OFF OFF ON ON OFF K101 and K102 reset states Pin 8 switched to Pin 9 Pin 3 switched to Pin 2 K101 and K102 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 4 14 Troubleshooting Table 4 7 Q2 signal switching Range Q101 0102 0114 0136 0109 K101 102 013 0105 0104 0108 1000 OFF OFF OFF SET RESET OFF ON OFF OFF 1kQ ON ON OFF OFF OFF SET RESET OFF ON OFF OFF 10 0 ON ON OFF OFF OFF SET RESET OFF ON OFF OFF 100kQ ON ON OFF OFF OFF SET RESET OFF ON OFF OFF IMQ ON ON OFF OFF OFF SET RESET OFF ON OFF OFF 10MQ ON ON OFF OFF ON SET RESET OFF ON OFF OFF 100MQ ON ON OFF OFF ON SET RESET OFF ON OFF OFF K101 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 K102 reset states Pin 8 switched to Pin 9 Pin 3 switched to Pin 2 Table 4 8 24 signal switching Range Q101 Q10
39. Model 7700 calibration procedures Format cal prot cardl init Parameter None Description The INIT command enables Model 7700 calibration when performing these procedures over the bus This command must be sent to the unit after sending the CODE command but before performing Model 7700 calibration Example CAL PROT CARD1 INIT Initiate 7700 calibration Calibration Reference B 19 LOCK CALibration PROTected CARD1 LOCK Purpose To lock out Model 7700 calibration Format cal prot cardl lock Parameter None Description The LOCK command allows you to lock out Model 7700 calibration after completing the procedure Thus LOCK performs the opposite of enabling calibration with the CODE command Example CAL PROT CARD1 LOCK Lock out card 1 calibration LOCK CALibration PROTected CARD1 LOCK Purpose To read Model 7700 calibration lock status Format cal prot cardl lock Response O Calibration locked Calibration unlocked Description The LOCK query requests status from the Model 2700 on Model 7700 calibration locked unlocked state Calibration must be enabled sending the CODE command before calibration can be performed Example CAL PROT CARD1 LOCK Request card 1 cal lock state RCOunt CALibration PROTected CARD1 RCOunt Purpose To reset card calibration count to 0 Format cal prot cardl rco Parameter None Description The RCOunt command resets the card calibration count
40. PROT AC STEP7 100VAC at 1kHz 100 0000V 1kHz CAL PROT AC STEP8 100VAC at 50kHz 100 0000 50kHz CAL PROT AC STEPO 700 000V kHz CAL PROT AC STEP1 CAL PROT AC STEP2 CAL PROT AC STEPI0 AC current calibration Follow these steps for AC current calibration 1 Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2700 as shown in Figure 2 3 2 Perform the calibration steps summarized in Table 2 12 For each step Set the calibrator to the indicated current and frequency and make sure the unit is in operate You must use the stated current and frequency e Send the indicated programming command Wait until the Model 2700 completes each step before continuing Table 2 12 AC current calibration programming steps Calibration step Calibrator current frequency Calibration command 100mA at 1kHz 100 0000mA 1kHz CAL PROT AC STEP1 1 at 1kHz 1 000000A 1kHz CAL PROT AC STEP12 2A at 1kHz 2 000000A 1kHz CAL PROT AC STEP 13 Programming calibration dates Program the present calibration date and calibration due date by sending the following commands CAL PROT DATE year month day CAL PROT NDUE year month day For example the following commands assume calibration dates of 12 15 1999 and 12 15 2000 respectively CAL PROT DATE 1999 12 15 CAL PROT NDUE 2000 12 15 2 18 Calibration Saving calibration constants After complet
41. RES 24K 5 1W 200V THICK FILM R 437 24K R149 R151 R386 R387 RES 150 1 100MW THICK FILM R 418 150 R150 R388 RES 49 9K 1 100MW THICK FILM R 418 49 9K R153 RES NET 3 6K MICRO DIVIDER TF 246 1 R155 201 204 206 208 211 214 218 223 RES 4 75K 1 100MW THICK FILM R 418 4 75K 229 R157 RES 499 1 100MW THICK FILM R 418 499 R158 RES 0 1 1 2W 4 TERMINAL MOLDED R 342 1 R159 R272 RES 1K 1 125mW METAL FILM R 391 1K R164 R137 R143 R152 RES 100K 1 125mW METAL FILM R 391 100K R169 R369 R392 R396 R403 RES 4 75K 1 100MW THICK FILM R 418 4 75K R172 R339 R343 RES 1 100MW THICK FILM R 418 1M R188 RES 49 9 1 125mW METAL FILM R 391 49 9 R189 RES 3 01K 1 125MW METAL FILM R 391 3 01K R192 RES 6 98K 1 125MW METAL FILM R 391 6 98K R194 RES 7 06K 1 0 125W METAL FILM R 443 7 06K R195 RES 70 6K 1 0 125W METAL FILM R 443 70 6K R196 RES 2K 1 125mW METAL FILM R 391 2K R197 R264 RES IK 1 100MW THICK FILM R 418 1K R202 276 282 319 344 345 370 371 378 RES 10K 1 100MW THICK FILM R 418 10K R205 R338 RES 10 0 5 1 8W METAL FILM R 246 10 R212 R217 R220 R221 R397 RES 2 21K 1 100MW THICK FILM R 418 2 21K R215 RES 4 42K 1 125MW METAL FILM R 391 4 42K R216 RES 2 21K 1 125mW METAL FILM R 391 2 21K R224 R263 R295 RES 10K 1 100MW THICK FILM R 418 10K R225 R402 RES 470 5 125MW METAL FILM R 375 470 R226 RES 475 1 100MW THICK FILM R 418 475 R228 R235 R237 245 R250 R
42. TG 243 R101 R102 RES 1M 5 125MW METAL FILM R 375 1M R103 107 108 113 120 121 124 125 132 RES 24K 5 1W 200V THICK FILM R 437 24K 139 R104 R105 RES 549K 0 1 1 4W METAL FILM R 315 549K R106 RES 11K 0 1 1 10W METAL FILM R 263 11K R109 R134 R168 RES 1K 1 125mW METAL FILM R 391 1K R110 R133 RES NET 9K 1K MICRO DIVIDER TF 246 2 R111 140 165 182 190 200 279 342 289 RES 1 100MW THICK FILM R 418 1K 296 R114 RES 604 1 1OOMW THICK FILM R 418 604 R115 R175 R176 R324 RES 2 49K 1 125MW METAL FILM R 391 2 49K R116 R384 R385 R112 RES 15k 1 1000MW THICK FILM R 418 15K R117 RES NET VARIOUS 0 1 TF 255 R119 RES 15k 1 1000MW THICK FILM R 418 15K Replaceable Parts 6 5 Table 6 1 Continued Model 2700 motherboard parts list Circuit Designation Description Keithley Part No R123 RES 73 2K 196 100MW THICK FILM R 418 732K R126 R128 R185 R275 RES 475 196 125mW METAL FILM R 391 475 R129 RES 215 1 100MW THICK FILM R 418 215 R130 R177 R183 R186 R191 R193 R315 RES 100K 1 100MW THICK FILM R 418 100K R154 R131 136 138 141 161 178 179 180 184 RES 100 1 125mW METAL FILM R 391 100 187 R135 RES 33 2K 1 100MW THICK FILM R 418 33 2K R142 RES 10 5 125MW METAL FILM R 375 10 R145 R156 R213 R248 R257 R308 RES 100 1 100MW THICK FILM R 418 100 R146 RES 1 1M 5 125MW METAL FILM R 375 1 1M R147 RES 732K 1 100MW THICK FILM R 418 732K R148 R163
43. TG 392 Q62 64 66 68 70 72 74 76 78 80 82 84 86 TRANS PNP SILICON TG 388 Q63 65 67 69 71 73 75 77 79 81 83 85 87 TRANS NPN SILICON TG 389 Q8 10 12 14 16 18 20 22 24 26 28 30 32 TRANS PNP SILICON TG 388 Q88 TRANS PNP SILICON TG 388 Q89 TRANS NPN SILICON TG 389 Q9 11 13 15 17 19 21 23 25 27 29 31 33 TRANS NPN SILICON TG 389 RI RES 69 8K 1 IW THICK FILM R 418 69 8K R12 R55 RES 137 1 125MW METAL FILM R 391 137 R13 R14 RES 3 01K 1 125MW METAL FILM R 391 3 01K R15 R54 R57 R96 RES 422K 196 125MW METAL FILM R 391 4 22K R3 108 109 110 111 112 113 2 5 6 RES 1K 1 100MW THICK FILM R 418 1K R4 RES 10K 1 100MW THICK FILM R 418 10K 101 122 CONN 4 PIN 125 04 TE 115 4 U1 U2 U3 U4 U5 U6 IC 8 STAGE SHIFT STORE MC14094BD IC 772 014 IC RETRIG MULTIVIB 74HC123AM IC 788 016 2 5 CASCADABLE SERIAL EEPROM LSI 212 U25 IC TINYLOGIC CMOS INVERTER IC 1282 U26 U27 IC 2 INPUT AND GATE IC 1140 BOTTOM CARD COVER 7102 301C TOP CARD COVER 7102 302C COMPRESSION SPRING SP 7 3 Replaceable Parts 6 13 Table 6 7 Model 7703 parts list Circuit Designation Description Keithley Part No C1 C9 C20 C2 C23 C24 C25 C26 C27 CAP 47P 5 100V CERAMIC C 465 47P C22 CAP 4 7U 10 35V TANTALUM C 476 4 7 C3 C4 C8 C10 C14 C19 C21 CAP 0 1UF 2096 50V CERAMIC C 418 1 CRLCR2 ULTRAFAST POWER RECTIFIER RF 107 J1015 CONN RT ANGLE DUAL ROW RECEPT CS 1065 1 1 35 REED RELAY RL 237 P1016 P1017 CO
44. WARRANTY OF MERCHANTABILITY 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 China Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 62022886 Fax 8610 62022892 FRANCE Keithley Instruments Sarl 60 3 all e des Garays 91122 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 GERMANY Keithley Instruments GmbH Landsberger Strasse 65 D 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 Ins
45. available calibration menu items until the unit displays RUN then press ENTER c Atthe prompt enter the calibration code The default code is 002700 Use the left and right arrow keys to move among the digits use the up range key to incre ment numbers and press the down range key to specify alphabetic letters Confirm the code by pressing ENTER d Choose N at the prompt to proceed without changing the code then press ENTER Calibration 2 7 3 Choose which of the calibration tests summarized in Table 2 2 you want to run at the CAL RUN prompt Use the up and down range keys to scroll through the options select your choice by pressing ENTER Table 2 2 Comprehensive calibration procedures Procedure Menu choice Procedures Full calibration ALL All comprehensive calibration steps DC and AC DCV DCI and ohms DC DC voltage DC current and resistance calibration ACV and ACI AC AC voltage and AC current calibration Front panel short and open calibration At the Model 2700 prompt for a front panel short do the following 1 Connect the Model 8610 low thermal short to the instrument front panel INPUT and SENSE terminals as shown in Figure 2 1 Make sure the INPUTS button is not pressed in so that the front inputs are selected Wait at least three minutes before proceeding to allow for thermal equilibrium Figure 2 1 S4 HI Low thermal short Model 2700 connections Model 8610 Low thermal short
46. count 1024 auto zero off 18 Auto zero off NPLC 0 01 19 Add 0 5 C uncertainty for type N T and E for temperatures 100 C for types and 5 4400 C and for type B lt 1100 C Guaranteed by design for types B E N R and S T Specifications A AC SPECIFICATIONS Accuracy of reading of range 23 C 5 C Calibration 3Hz 10Hz 20 kHz 50 kHz 100 kHz Function Range Resolution Cycle 10Hz 20 kHz 50 kHz 100 kHz 300 kHz Voltage 100 0000 mV 0 1 uV 90 Days 0 35 0 03 0 05 0 03 0 11 0 05 0 6 4 0 08 4 0 40 5 1000000 V 10 10 00000 V 10 uV lYear 0 35 0 03 0 06 0 03 0 12 0 05 0 6 0 08 4 0 0 5 100 0000 V 100 750 000 V 10 uV Temp Coeff C 0 035 003 0 005 003 0 006 005 0 01 006 0 03 01 3Hz 10Hz 10Hz 5 kHz Current 1 000000 A 10 pA 90 Day 1 0 30 0 04 0 10 0 04 3 00000 A 10 pA 0 35 0 06 0 15 0 06 Temp Coeff C 0 035 0 006 0 015 0 006 3 Hz 500 kHz 333 ms 2 us Frequency 100mV 0 333ppm 900 1 100 ppm 0 333 ppm SLOW 1s gate and Period to 3 33 ppm 100 ppm 3 33 ppm MED 100ms gate 750 V 333 ppm 100 ppm 33 3 ppm FAST 10ms gate Additional Uncertainty of reading Low Frequency Uncertainty MED FAST 20Hz 30Hz 0 3 30Hz 50Hz 0 50 Hz 100 Hz 0 10 100 Hz 200 Hz 0 0 18 200 Hz 300 Hz 0 0 10 gt 300 Hz 0 0 CREST FACTOR 5 1 2 2 3 3 4 4 5 Additional Uncertainty 0 05 015 030 04
47. each calibration step e Always let the source signal settle before calibrating each point error occurs during calibration the Model 2700 will generate an appropriate error message See Appendix B for more information WARNING Observe the following safety precautions when performing these tests e Some of the procedures in this section may expose you to dangerous voltages Use standard safety precautions when such dangerous voltages are encountered to avoid personal injury or death caused by electric shock e For the front panel terminals only the maximum common mode volt age voltage between INPUT LO and chassis ground is 500V peak Exceeding this value may cause a breakdown in insulation creating a shock hazard e For the plug in modules the maximum common mode voltage volt age between any plug in module terminal and chassis ground is 300V DC or 300V RMS Exceeding this value may cause a breakdown in insulation creating a shock hazard When using the front panel terminals simultaneously with plug in modules all cable insulation voltage ratings must equal or exceed the maximum voltage applied to either the front panel terminals or the plug in module terminals 2 4 Calibration Calibration code Before performing comprehensive calibration you must first unlock calibration by entering the appropriate calibration code Front panel calibration code For front panel calibration follow these steps 1
48. end of Section 6 De solder the battery from the top side of the circuit board 5 Install a new battery Keithley part number BA 51 taking care to observe proper polarity 6 Solder the battery connection to the circuit board using organic OA based flux solder 7 After soldering remove all flux using a foam tipped swab or brush dipped in pure water Blow dry the board with dry nitrogen gas then allow the board to dry for several hours in a 50 C low humidity environment before use 8 Re install the top cover by following the disassembly procedures in Section 5 in reverse order Troubleshooting 4 2 Troubleshooting Introduction This section of the manual will assist you in troubleshooting and repairing the Model 2700 Included are self tests test procedures troubleshooting tables and circuit descriptions It is left to the discretion of the repair technician to select the appropriate tests and documentation needed to troubleshoot the instrument Refer to the disassembly procedures in Section 5 and the parts lists in Section 6 for further information WARNING The information in this section is intended only for qualified service per sonnel 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 Use caution when working with hazardous voltages Repair considerations Before making any repairs to the Model 2
49. equipment Extender board connections Model 7700 calibration Routine Maintenance InttOdUCHOn nip Setting the line voltage and replacing the line fuse Replacing the front terminal AMPS fuse Replacing plug in module amps fuses 2 2 1 Replacing Model 7700 amps fuses Replacing Model 7702 amps fuses Replacing non volatile RAM battery Troubleshooting M Repair considerations Power on self test esee Front panel tests KEY DISP test oot ooi rentes Principles of operation Powersupply eire tiene neas Display Digital circuitry teet eerte Analog CICUItry Troubleshooting 52 titii nhe lee ena Display board checks Power supply checks Digital circuitry checks eee Analog signal switching states esee No comm link error eese eee Disassembly IntrodUCHOn eter reete tere Handling and cleaning
50. 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 you have removed the flux swab only the repair area with methanol then blow dry the board with dry nitrogen gas e After cleaning allow the board to dry in 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 CMOS devices are installed in the Model 2700 Handle all semicon ductor devices as being static sensitive Transport and handle ICs only in containers specially designed to prevent static build up Typically 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 Also ground yourself with a suitable wrist strap Handle the devices only by the body do not touch the pins Ground any printed circuit board into which a semiconductor device is to be inserted to the bench or table Use only anti static type desoldering tools
51. set the reference junction temperature to 0 C then press ENTER twice to complete the temperature configuration process 3 Select the temperature function by pressing the TEMP key 1 16 Performance Verification 4 Source each of the voltages summarized in Table 1 7 and verify that the temperature readings are within limits Be sure to select the appropriate thermocouple type for each group of readings See step 2 above Table 1 7 Thermocouple temperature verification reading limits Thermocouple type Applied DC voltage Reading limits 1 year 18 C to 28 C J 7 659mV 190 2 to 189 9 C 0 2 to 0 2 C 42 280mV 749 8 to 750 22C K 5 730mV 190 2 to 189 8 C 0 2 to 0 2 54 138mV 1349 8 to 1350 2 C Voltages shown are based on ITS 90 standard using 0 C reference junction temperature See text for pro cedure to set reference junction temperature RTD temperature 1 Connect the precision decade resistance box listed in Table 1 1 to the Model 2700 INPUT and SENSE jacks using four wire connections See Figure 1 5 for similar con necting scheme Be sure the INPUTS switch is in the FRONT position 2 Configure the Model 2700 temperature function for C units and RTD temperature sen sor 0 0 00385 as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C Press ENTER and note the unit displays the sensor type SENS TCOUPLE Usin
52. stated limits 7 Press the OPEN key to open Channel 1 Table 1 9 Plug in module DCV reading limits Range Applied DC voltage Reading limits 1 year 18 to 28 C 100mV 100 0000mV 99 9935 to 100 0065mV IV 1 000000V 0 999963 to 1 000037V 10V 10 00000V 9 99965 to 10 00035V 100V 100 0000V 99 9946 to 100 0054V 1000V 300 000V 299 976 to 300 024V Source positive and negative values for each range 1 20 Performance Verification Verifying AC voltage Check AC voltage accuracy by applying accurate AC voltages at specific frequencies from the AC voltage calibrator to the Model 7700 inputs and verifying that the displayed readings fall within specified ranges CAUTION not exceed 300V RMS between plug in module INPUT and L termi nals or between adjacent channels or 8 x 107 VeHz input because instru ment damage may occur Follow these steps to verify AC voltage accuracy 1 Connect the Model 7700 CH1 and L INPUT terminals to the AC voltage calibrator as shown in Figure 1 9 Figure 1 9 Connections for Model 7700 AC volts verification Amplifier Connect to calibrator
53. the 7798 250B Calibration Extender Test Board together using clean solid copper wires These connections will form a low thermal short necessary for the manufacturing calibration procedure The Calibration Extender Test Board should then be installed in scanner Slot 1 Unlocking manufacturing calibration To unlock manufacturing calibration press and hold in the OPEN key while turning on the power Measuring function generator signal amplitude The 3Hz function generator signal amplitude must be accurately measured using the digital multimeter listed in Table 2 13 Proceed as follows 1 Connect the function generator output to the digital multimeter INPUT jacks See Figure 2 5 for typical connections 2 Turn on the function generator and multimeter and allow a two hour warm up period before measuring 3 Set the function generator to output a 1V RMS sine wave at 3Hz measure and record the signal amplitude 2 20 Calibration Front panel manufacturing calibration 1 Install the shorted calibration extender board see Extender board preparation earlier in this section in scanner card Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium Press in and hold the OPEN key while turning on the power 3 Press SHIFT then TEST then display CALIB TEST with the up or down range key Press ENTER select RUN then enter the appropriate calibration code default 002700 Se
54. the INPUTS switch Allow three minutes for thermal equilibrium 3 Accurately measure and record the cold temperature of the Model 7700 card surface at the center of the card with an RTD sensor 4 Press in and hold the Model 2700 OPEN key while turning on the power Calibration 2 23 5 Press SHIFT then TEST then display TEST CALIB with the up or down range key Press ENTER select RUN then enter the appropriate calibration code default 002700 6 Using the up or down range key select CARD at the CAL RUN prompt then press ENTER 7 Set the display value to the cold calibration temperature you measured in Step 3 then press ENTER to complete Model 7700 calibration Remote Model 7700 calibration 1 Connect the Model 7700 to the 7797 Calibration Extender Board see Extender board connections above 2 With the power off install the Model 7700 7797 combination in Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium 3 Accurately measure and record the cold temperature of the Model 7700 card surface at the center of the card Press in and hold the Model 2700 OPEN key while turning on the power 5 Enable calibration by sending the CODE command For example the default com mand is CAL PROT CODE K1002700 6 Initiate calibration by sending the following command CAL PROT CARDI INIT 7 Calibrate the Model 7700 with the following command CAL PROT CARDI
55. type and rating listed If the instrument repeatedly blows fuses locate and correct the cause of the trouble before replacing the fuse 3 If configuring the instrument for a different line voltage remove the line voltage selec tor from the assembly and rotate it to the proper position When the selector is installed into the fuse holder assembly the correct line voltage appears inverted in the window CAUTION Operating the Model 2700 on the wrong line voltage may result in instru ment damage 4 Install the fuse holder assembly into the power module by pushing it in until it locks in place Routine Maintenance 3 3 Figure 3 1 Model 2700 Power module TES TURIN s Line Voltage Selector Window Fuse Holder Assembly Table 3 1 Power line fuse Line Voltage Rating Keithley Part No 100 120V 1 2A 250V 5 x 20 mm slow blow FU 71 200 240V 1 4A 250V 5 x 20 mm slow blow FU 96 4 3 4 Routine Maintenance Replacing the front terminal AMPS fuse The front terminal AMPS fuse protects the Model 2700 current input from an over current condition Follow the steps below to replace the AMPS fuse WARNING Make sure the instrument is disconnected from the power line and other equipment before replacing the AMPS fuse 1 off the power and disconnect the power line and test leads 2 From the front panel gen
56. 0 AC MEASUREMENT CHARACTERISTICS AC Volts MEASUREMENT METHOD AC coupled True RM S INPUT IMPEDANCE 1M 2 by lt LOOpF INPUT PROTECTION 1000Vp or 400VDC 300Vrms with plug in modules AC Current MEASUREMENT METHOD AC coupled True RM S SHUNT RESISTANCE 0 10 BURDEN VOLTAGE 1A 0 3Vrms lt 1Vrms Add 1Vrms when used with plug in modules INPUT PROTECTION 3A 250V fuse Frequency and Period MEASUREMENT METHOD Reciprocal Counting technique GATE TIME SLOW 1s MED 100ms and FAST 10ms AC General 7008 MAXIMUM CREST FACTOR 5 at full scale VOLT HERTZ PRODUCT lt 8 x 10 A 6 Specifications AC OPERATING CHARACTERISTICS 60Hz 50Hz Operation Function Digits Readings s Rate Bandwidth ACV ACI 6 58 2s Reading SLOW 3 Hz 300 kHz 6 58 1 4 1 1 MED 30 Hz 300 kHz 6 59 4 8 4 MED 30 Hz 300 kHz 6 5 35 28 FAST 300 Hz 300 kHz Frequency 6 5 1 1 SLOW 3 Hz 300 kHz Period 55 9 9 MED 30 Hz 300 kHz 45 35 35 FAST 300 Hz 300 kHz 4 510 65 65 FAST 300 Hz 300 kHz AC System Speeds 1 RANGE CHANGES 4 5 3 s FUNCTION CHANGES 4 5 3 5 AUTORANGE TIME lt 3s ASCII READINGS TO RS 232 19 2k baud 50 s MAX INTERNAL TRIGGER RATE 300 s MAX EXTERNAL TRIGGER RATE 250 s AC Notes 1 20 overrange except on 750V and 3A 2 Specification are for SLOW mode and sine wave inputs gt 5 of range SLOW and MED multi sample c
57. 1 888 KEITHLEY for a Return Material Authorization RMA number Complete the service form at the back of this manual and include it with the instrument e Carefully pack the instrument in the original packing carton Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label Component layouts Component layouts for the various circuit boards are provided on the following pages Replaceable Parts 6 3 Table 6 1 Model 2700 motherboard parts list Circuit Designation Description Keithley Part No BT100 L1 BATTERY 3 6V 950MAH BA 51 C102 CAP 0 01UF 1096 1000V CERAMIC C 64 01 C104 CAP 100UF 2096 63V ALUM ELEC C 403 100 C105 CAP 0 22UF 2096 400V FILM C 513 22 C106 C291 C292 CAP 15P 1 100V CERAMIC 512 15 107 116 118 122 124 125 128 133 136 CAP 0 1UF 20 50V CERAMIC C 418 1 C108 CAP 0 1UF 20 100V CERAMIC C 436 1 C109 CAP 2 2UF 20 63V POLYCARB C 480 2 2 C110 C226 C254 C263 CAP 47P 596 100V CERAMIC C 465 47P C111 C103 C117 C147 C151 CAP 0 1UF 20 50V CERAMIC C 418 1 C112 C248 CAP 0 01 5 50V NPO C 514 01 C113 C114 C119 C126 C247 CAP 1000P 10 100V CERAMIC C 451 1000P C115 CAP 0 33UF 20 63V POLYCARBONATE C 482 33 C120 CAP 270PF 5 100V CERAMIC C 465 270P C121 C134 C140 C251 C287 CAP 47PF 1096 100V CERAMIC C 451 47P C123 C245 CAP 1000P 10 100V CERAMIC C 451 1000P C131 C148 CAP 1000U 2096 35V ALUM ELEC C 595 1000 C132 CAP 220PF 10
58. 1 CABLE CLAMP CC 37 2 CAPTIVE PANEL SCREW FA 232 1C 1 CARD CAGE 2700 318A 1 CHASSIS 2700 301B 6 CONNECTOR CS 236 2 CONNECTOR CS 638 8 1 CONNECTOR HARDWARE KIT CS 713 2 CONNECTOR HOUSING CS 638 3 1 CONTACT CURRENT INPUT 2001 313C 1 COVER 2700 307B 1 DISPLAY LENS 2700 311A 2 FASTENER FA 230 2B 2 FOOT 428 319A 2 FOOT EXTRUDED FE 22A 2 FOOT RUBBER FE 6 1 FRONT PANEL 2001 302G 1 FRONT PANEL OVERLAY 2700 313A 1 FRONT REAR ROD 2700 319A 1 FUSE 0 25A FU 96 4 1 FUSE HOLDER FH 35 1 1 FUSE 3A 250 FU 99 1 1 HANDLE 428 329F 1 JACK CURRENT INPUT 2001 312D 1 LINE CORD CO 7 1 LINE MODULE PM 1 1B 1 MOTHERBOARD SHIELD 2700 306A 1 MOUNTING EAR LEFT 428 338B 1 MOUNTING EAR RIGHT 428 328E 2 PC BOARD STOP 2001 371A 1 POWER ROD 704 313A 1 RFI CLIP CHASSIS 2001 366 1A 4 SCREWLOCK FEMALE CS 725 1 SWITCHPAD 2000 310A 1 TEST LEADS CA 22 1 TRANSFORMER TR 299B 1 1 TRANSFORMER TR 299B Replaceable Parts 6 11 Table 6 5 Model 7700 parts list Circuit Designation Description Keithley Part No C1 C9 C10 C11 C14 C15 C22 C4 CAP 0 1UF 20 50V CERAMIC C 418 1 C16 CAP 220U 20 10V TANTALUM C 558 220 C17 C18 C19 C21 C25 C26 C23 C24 C15 CAP 47P 5 100V CERAMIC C 465 47P C2 C6 C7 C8 C12 C13 C20 C27 C28 C31 CAP 0 1UF 2096 50V CERAMIC C 418 1 C29 C32 C33 C34 CAP 47P 596 100V CERAMIC C 465 47P C30 CAP 4 7U 10 35V TANTALUM C 476 4 7 CRI CR22 DIODE DUAL SWITCHING BAV99L RF 82 CR23 CR24 CR26 CR27 DIODE SWITCHING
59. 100E3 is recommended for best results Example CAL PROT DC STEP8 100E3 Program 100kQ step STEP9 CALibration PROTected DC STEP9 Purpose To program the comprehensive calibration step Format cal prot dc step9 Cal resistance Parameter Cal resistance 900E3 to 1 1E6 Description STEP9 programs the 1MQ comprehensive calibration step The allowable range of the calibration resistance parameter is from 900E3 to 1 1E6 Use the 1E6 value whenever possible or the closest possible value Example CAL PROT DC STEP9 Program 1M calibration step STEP10 CALibration PROTected DC STEP1 0 Purpose To program the 10 comprehensive calibration step Format cal prot dc step10 Cal current Parameter Cal current gt 9E 3 to 11E 3 A Description STEP10 programs the 10mA comprehensive calibration step The allow able range of the calibration current parameter is from 9E 3 to 11E 3 Use the 10 3 value whenever possible for best results Example CAL PROT DC STEP10 10E 3 Program 10mA step B 12 Calibration Reference STEP11 CALibration PROTected DC STEP1 1 Purpose Format Parameter Description Example STEP12 To program the 100mA comprehensive calibration step cal prot dce stepll Cal current Cal current 90E 3 to 110E 3 A STEP11 programs the 100mA comprehensive calibration step The allow able range of the calibration current parameter is from 90E 3 to 1 10E
60. 100V CERAMIC C 451 220P C137 CAP 33PF 596 100V CERAMIC C 465 33P C138 139 142 127 149 152 155 CAP 0 1UF 2096 50V CERAMIC C 418 1 159 163 144 C141 143 150 158 176 219 220 222 224 CAP 47P 596 100V CERAMIC C 465 47P C145 C240 CAP 1000pF 20 50V CERAMIC C 418 1000P C146 CAP 1000UF 20 16V ALUMINUM C 488 1000 C156 C281 CAP 3300U 20 16V ALUM ELEC C 592 3300 C157 CAP 100PF 5 100V CERAMIC C 465 100P C167 170 172 174 178 180 182 183 CAP 0 1UF 20 50V CERAMIC C 418 1 185 187 C171 C177 CAP 2200P 10 100V CERAMIC C 430 2200P C175 C209 CAP 22UF 2096 25V TANTALUM C 440 22 C179 C266 CAP 100PF 596 100V CERAMIC C 465 100P C190 193 194 197 199 201 208 210 CAP 0 1UF 2096 50V CERAMIC C 418 1 212 218 221 223 225 227 230 232 234 237 250 CAP 0 1UF 20 50V CERAMIC C 418 1 290 C241 CAP 0 01UF 1096 50V CERAMIC C 491 01 C242 C243 C283 C284 C246 C249 CAP 0 01UF 10 50V CERAMIC C 491 01 C244 C267 C272 C278 C282 CAP 1000pF 20 50V CERAMIC C 418 1000P C252 C253 CAP 22PF 10 100V CERAMIC C 451 22P C255 262 C268 C129 C130 CAP 47P 596 100V CERAMIC C 465 47P C264 C265 CAP 22P 596 100V CERAMIC C 465 22P C269 C270 C271 CAP 0 1UF 2096 50V CERAMIC C 418 1 C285 C286 C288 C289 CAP 47PF 1096 100V CERAMIC C 451 47P CR102 CR103 DIODE BRIDGE VM18 RF 52 CR104 DIODE SILICON W04M RF 46 6 4 Replaceable Parts Table 6 1 Continued Model 2700 motherboard parts lis
61. 2 Q114 Q136 Q109 K101 0113 0105 0104 0108 100 2 ON ON OFF OFF OFF SET ON OFF OFF OFF 1kQ ON ON OFF OFF OFF SET ON OFF OFF OFF 10kQ ON ON OFF OFF OFF SET ON OFF OFF OFF 100kQ ON ON OFF OFF OFF SET ON OFF OFF OFF IMQ ON ON OFF OFF OFF SET ON OFF OFF OFF 10MQ ON ON OFF OFF ON SET OFF ON OFF OFF 100MQ ON ON OFF OFF ON SET OFF ON OFF OFF K101 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Table 4 9 Q2 04 reference switching Range 0133 0 7 U133 7V Q123 Q125 Q124 Q126 Q120 100Q OFF ON ON ON OFF OFF ON 1kQ OFF ON ON ON OFF OFF ON 10kQ OFF ON OFF OFF ON ON ON 100kQ ON OFF OFF OFF ON ON ON IMQ ON OFF OFF OFF ON ON ON 10MQ OFF ON OFF OFF ON ON OFF 100MQ OFF ON OFF OFF ON ON OFF Table 4 10 DCA signal switching Range K103 20mA Set 100mA Reset 1A Reset 3A Reset K103 set states Pin 8 to 7 Pin 3 to 4 K103 reset states Pin 8 to 9 Pin 3 to 2 Troubleshooting 4 15 Table 4 11 ACA signal switching U105 U105 U111 U105 U103 U103 Range K103 16 16 8 16 1 1 Reset ON ON OFF OFF OFF OFF 3A Reset ON ON ON OFF OFF OFF K103 set states Pin 8 to 7 Pin 3 to 4 K103 reset states Pin 8 to 9 Pin 3 to 2 4 16 Troubleshooting Table 4 12 through Table 4 16 can be used to trace the analog signal through the A D multi plexer U163 to the final amplifier stage These tables show the MUX lines S3 54
62. 252 R255 RES 475 1 100MW THICK FILM R 418 475 R230 RES 49 9K 1 100MW THICK FILM R 418 49 9K R231 233 238 244 254 293 348 351 355 RES 4 75K 1 100MW THICK FILM R 418 4 75K 359 R234 RES 5 11K 1 100MW THICK FILM R 418 5 11K 6 6 Replaceable Parts Table 6 1 Continued Model 2700 motherboard parts list Circuit Designation Description Keithley Part No R241 RES 34K 1 100MW THICK FILM R 418 34K R243 RES 10 10 1OOMW THICK FILM R 418 10 R246 RES 82 5 1 100MW THICK FILM R 418 82 5 R249 RES 4 02 1 100MW THICK FILM R 418 4 02K R256 R284 R288 R298 R299 R334 340 RES IK 1 1OOMW THICK FILM R 418 1K 341 R340 R259 R320 RES 10 10 1000MW THICK FILM R 418 10 R271 RES NET TF 245 R273 R274 R307 R314 R406 R416 RES 475 1 125mW METAL FILM R 391 475 R277 RES 66 5K 1 1000MW THICK FILM R 418 66 5K R278 R281 RES 357 1 100MW THICK FILM R 418 357 R280 RES 49 9 1 100MW THICK FILM R 418 49 9 R283 RES 470 5 125MW METAL FILM R 375 470 R287 R347 RES 1 28M 0 1 1 8W METAL FILM 176 1 28 R290 R400 R401 RES 49 9K 1 125MW METAL FILM R 391 49 9K R291 R292 R325 R326 R327 R328 R346 RES 49 9K 1 100MW THICK FILM R 418 49 9K R300 RES 6 04K 1 125MW THIN FILM R 423 6 04K R302 R303 RES 499 1 1OOMW THICK FILM R 418 499 R304 RES 20K 1 100OMW THICK FILM R 418 20K R305 383 390 394 RES 1 1OOMW THICK FILM R 418 1K R309 RES 1K 0 1 1 10W METAL F
63. 2700 AC current verification Output HI Model 2700 nput Lr wm LO Inputs Amps 2 Select the AC current function by pressing the ACI key 3 Set the Model 2700 for the range 4 Source 1A and 3A 1kHz full scale AC currents as summarized in Table 1 5 and verify that the readings are within stated limits Table 1 5 ACI limits ACV range Applied AC voltage Reading limits 1kHz 1 year 18 C to 28 C 1A 1 000000 0 99860 1 00140 3 00000A 2 9937 to 3 0063A Tf the Fluke 5725A amplifier is not available apply 2 2A from the calibrator Reading limits for 2 2A are 2 1949 to 2 2051A Performance Verification 1 13 Verifying resistance Check resistance by connecting accurate resistance values to the Model 2700 and verifying that its resistance readings are within the specified limits CAUTION Do not apply more than 1000V peak between front terminals INPUT HI and LO or more than 350V peak between SENSE HI and LO or instru ment damage could occur Follow these steps to verify resistance accuracy 1 Using shielded Teflon insulated or equivalent cables in a 4 wire configuration connect the Model 2700 INPUT and SENSE jacks to the calibrator as shown in Figure 1 5 Be sure the INPUTS switch is in the FRONT position Fi
64. 2700 for the 100mV range make sure that REL is disabled 4 Source IKHz and 50kHz AC voltages for each of the ranges summarized in Table 1 3 and make sure that the respective Model 2700 readings fall within stated limits 1kHz reading limits 1 year 18 C to 28 C 50kHz reading limits 1 year 18 C to 28 C Table 1 3 ACV reading limits ACV Applied AC range voltage 100mV 100 0000mV 1V 1 000000V 10V 10 00000V 100V 100 0000V 750V 700 000V 99 910 to 100 090mV 0 99910 to 1 00090V 9 9910 to 10 0090V 99 910 to 100 090V 699 36 to 700 64V 99 830 to 100 170mV 0 99830 to 1 00170V 9 98300 to 10 0170V 99 830 to 100 170V 698 79 to 701 21V Tf the 5725A amplifier is not available change the 700V 2 50kHz step to 220V 50kHz Reading limits for 220V 50kHz 219 36 to 220 64V Performance Verification 1 11 Verifying DC current Check DC current accuracy by applying accurate DC currents from the DC current calibra tor to the AMPS input of the Model 2700 and verifying that the displayed readings fall within specified limits Follow these steps to verify DC current accuracy 1 Connect the Model 2700 AMPS and INPUT LO jacks to the calibrator as shown in Figure 1 3 Be sure the INPUTS switch is in the FRONT position Figure 1 3 Connections for Model 2700 DC current verification Calibrator Output DC Current Model 2700 LO
65. 3 Use the 100E 3 value whenever possible for best results CAL PROT DC STEP11 0 1 Program 100mA step CALibration PROTected DC STEP1 2 Purpose Format Parameter Description Example To program the 1A comprehensive calibration step cal prot dc stepl2 Cal current Cal current gt 0 9 to 1 1 A STEP12 programs the 1A comprehensive calibration step The allowable range of the calibration current parameter is from 0 9 to 1 1 Use a value of 1 whenever possible for best results CAL PROT DC STEP12 1 Program 1 step Calibration Reference B 13 AC calibration commands The AC commands perform comprehensive user calibration of the ACV and ACI func tions Table B 3 summarizes these calibration commands Table B 3 AC calibration commands Command Description CALibration PROTected AC STEPI 10mV at 1kHz calibration step STEP2 100mV AC at 1kHz calibration step STEP3 100mV AC at 50kHz calibration step 5 4 1V AC at 1kHz calibration step 5 5 1V AC at 50kHz calibration step STEP6 10V AC at 1kHz calibration step 5 7 10V AC at 50kHz calibration step STEPS 100V AC at 1kHz calibration step 5 9 100V AC at 50kHz calibration step STEP10 700V AC at 1kHz calibration step STEP11 100mA AC at 1kHz calibration step 5 12 1A AC at 1kHz calibration step 8 2A AC at 1KHz calibration step B 14 Calibration Reference 5 lt
66. 3 CJ E Q Oo e Note Be sure calibrator is set for normal current output Select the DC current measurement function by pressing the DCI key Set the Model 2700 for the 20mA range Source positive and negative full scale currents for each of the ranges listed in Table 1 4 and verify that the readings for each range are within stated limits Bow Table 1 4 DCI limits DCI range Applied DC current Reading limits 1 year 18 C to 28 C 20mA 20 0000mA 19 89960 to 20 01040mA 100mA 100 0000mA 99 9100 to 100 0900mA 1A 1 000000A 0 999160 to 1 000840A 3A 3 000000A 2 99628 to 3 00372A Source positive and negative currents with values shown Tf the Fluke 5725 amplifier is not available apply 2 2A from calibrator Reading limits for 2 2A input are 2 197240 to 2 202760A 1 12 Performance Verification Verifying AC current Check AC current accuracy by applying accurate AC voltage current at specific frequencies from the AC current calibrator to the Model 2700 input and verifying that the displayed read ings fall within specified limits Follow these steps to verify AC current 1 Connect the Model 2700 AMPS and INPUT LO jacks to the calibrator as shown in Figure 1 4 Be sure the INPUTS switch is in the FRONT position Figure 1 4 Connections for Model
67. 4 Model 7700 thermocouple temperature verification reading limits Thermocouple type Applied DC voltage Reading limits 1 year 18 C to 28 C J 7 659mV 191 0 to 189 0 C 1 0 to 1 0 C 42 280mV 749 0 to 751 09 K 5 730mV 191 0 to 189 0 C 1 0 to 1 0 C 54 138mV 1349 0 to 1351 0 C Voltages shown are based on ITS 90 standard Figure 1 14 Connections for Model 7700 thermocouple temperature verification Twisted CHI Thermocouple Wire 2 7 Calibrator Output DC Voltage EM CH cH CHo CHIO BS FL mii lt l ad Output gt C COD 2 6 O D 99 000 00000 O00 000 9 00 000 ooo OCD Cina Cine Output LO Model 7700 Low Thermal Copper Connection Make HI and LO Connections Ice Bath Notes This setup and reading limits table does not include errors from ice point thermocouple wire and connections HI and LO con
68. 408 CAP 33PF 1096 100V CERAMIC C 451 33P C413 CAP 22UF 2096 6 3 TANTALUM C 417 22 C414 CAP 47PF 1096 100V CERAMIC C 451 47P CR401 CR402 DIODE MBRO520LT1 RF 103 DS401 DISPLAY DD 61 P1014 CABLE ASSEMBLY CA 123 16A R401 404 406 409 411 414 418 RES 15K 1 100MW THICK FILM R 418 15K R405 R408 R410 R412 RES 12 1 1 125MW METAL FILM R 391 12 1 R413 RES 13K 1 100MW THICK FILM R 418 13K R419 RES 10M 5 125MW METAL FILM R 375 10M R420 R421 RES 10K 1 100OMW THICK FILM R 418 10K U401 PROGRAMMED ROM 2000 800 U402 U403 IC LATCHED DRIVERS UCN 5812EPF 1 IC 732 Y401 CRYSTAL 4MHZ CR 36 4M Order current firmware revision for example A02 Replaceable Parts 6 9 Table 6 3 Model 2700 connector board parts list Circuit Designation Description Keithley Part No J1009 CONN MALE 3 PIN CS 612 1 J1011 CONN FEMALE 8 PIN CS 612 8 J1013 CONN RT ANGLE HEADER CS 1066 1 J1015 J1016 CONN 2 ROWS OF 16 PINS CS 736 4 L601 L602 FERRITE CHIP 600 OHM BLM32A07 CH 62 R600 R601 RES 4 75 1 100MW THICK FILM R 418 4 75K R602 603 607 608 609 610 611 612 RES 475 1 125mW METAL FILM R 391 475 R604 R604 R606 RES 475 1 125mW METAL FILM R 391 475 6 10 Replaceable Parts Table 6 4 Model 2700 miscellaneous parts list Qty Description Keithley part no 2 BANANA JACK PUSH IN BLACK BJ 14 0 2 BANANA JACK PUSH IN RED BJ 14 2 1 BEZEL REAR 428 303D 1 CABLE ASSEMBLY CA 219 1A
69. 516 25 2 10 Channel 6 516 15 12 1 557 25 20 0 1 DC SYSTEM SPEEDS 18 RANGE CHANGES 50 5 42 5 FUNCTION CHANGES 50 5 42 s AUTORANGE 5 lt 30ms ASCII READINGS TO RS 232 19 2k BAUD 55 s MAX INTERNAL TRIGGER RATE 2000 s MAX EXTERNAL TRIGGER RATE 375 s gt 4 Specifications DC MEASUREMENT CHARACTERISTICS DC Volts A D LINEARITY 2 0 ppm of reading 1 0 ppm of range INPUT IMPEDANCE 100mV 10V Ranges Selectable gt 10GQ with 400pF or 10M O 1 100V 1000V Ranges 10M 1 INPUT BIAS CURRENT lt 75 at 23 C COMMON MODE CURRENT lt 500 at 50Hz or 60 Hz AUTOZERO ERROR Add 2ppm of range error 5 for 10 minutes 1 C INPUT PROTECTION 1000V all ranges 300V with plug in modules Resistance MAX 4WO LEAD RESISTANCE 10 of range per lead for 1000 and 1kQ ranges 1kQ per lead for all other ranges OFFSET COMPENSATION Selectable on 4WQ 1000 1kQ and 10kQ ranges CONTINUITY THRESHOLD Adjustable 1to 1000 Q INPUT PROTECTION 1000V all Source Inputs 350V Sense Inputs 300V with plug in modules DC Current SHUNT RESISTORS 100mA 3A 0 10 20mA 50 INPUT PROTECTION 3A 250V fuse Thermocouples CONVERSION 175 90 REFERENCE JUNCTION Internal External or Simulated Fixed OPEN CIRCUIT CHECK Selectable per channel Open gt 12kQ EARTH ISOLATION 500V peak gt 10GQ and lt 150pF any terminal to chassis DC N
70. 65 PROGRAMMED ROM 2000 802 0171 1317 U173 U148 U153 IC QUAD 2 IN NOR 74HCTO2 IC 809 U174 U181 U127 IC QUAD 2 IN AND 74 08 IC 837 U175 IC DUAL HIGH CMR SPEED OPTO HCPL 2631 IC 588 U180 IC QUAD 2 INPUT OR 74HCT32 IC 808 6 8 Replaceable Parts Table 6 1 Continued Model 2700 motherboard parts list Circuit Designation Description Keithley Part No U182 IC RETRIG MULTIVIB 74HC123AM IC 788 U187 IC MICROPROCESSOR RESET MAX809LEURT IC 1297 U188 U189 IC PROTECTED QUAD POWER DRIVERS IC 1212 U191 IC TINYLOGIC CMOS INVERTER IC 1282 U192 IC 2 INPUT AND GATE IC 1140 VR102 DIODE ZENER 6 0V BZX84B6V2 DZ 87 VR103 VR104 DIODE ZENER 6 8V MMSZ5235BT1 DZ 100 VR105 VR106 VR124 VR125 DIODE ZENER 11V MMSZ11T1 DZ 103 VR107 VR108 VR122 VR123 DIODE ZENER 3 3V MMBZ5226BL DZ 94 VR109 DIODE ZENER 17V MMBZ5247BL DZ 104 10 DIODE ZENER 5 1 BZX84C5VI DZ 88 VR112 VR113 DIODE ZENER 6 2V MMSZ6V2 DZ 97 VR119 VR120 DIODE ZENER 12V MMSZ12T1 DZ 112 Y101 CRYSTAL CR 55 1 Y102 OSCILLATOR HIGH SPEED CMOS 12MHZ CR 37 Y103 CRYSTAL FSM327 CR 41 Order current firmware revision for example A02 Table 6 2 Model 2700 display board parts list Circuit Designation Description Keithley Part No C401 C402 C411 CAP 0 1UF 20 50V CERAMIC C 418 1 403 404 405 407 409 410 412 0 1UF 10 25V CERAMIC C 495 1 C406 C
71. 700 be sure to read the following considerations CAUTION The PC 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 e Repairs will require various degrees of disassembly However it is recommended that the Front Panel Tests be performed prior to any disassembly The disassembly instruc tions for the Model 2700 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 2700 These static sensitive devices require special handling as explained in Section 5 e Whenever a circuit board is removed or a component is replaced the Model 2700 must be recalibrated See Section 2 for details on calibrating the unit Power on self test During the power on sequence the Model 2700 will perform a checksum test on its EPROM U156 and U157 and test its RAM U151 and U152 If one of these tests fails the instrument will lock up Troubleshooting 4 3
72. 9 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 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 e
73. 902 01 November 1999 Revision B Document Number 2700 902 01 February 2000 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 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 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 t
74. A19 Check for stuck bits MPU address bus 8 U135 lines DO D15_ Check for stuck bits MPU data bus 9 U135 pin 44 14 7456MHz MPU clock 10 1 159 pin 13 Pulse train during RS 232 I O RS 232 RX line 11 U159 pin 14 Pulse train during RS 232 I O RS 232 TX line 12 U158 pins 34 42 Pulse train during IEEE 488 I O IEEE 488 data bus 13 U158 pins 26 31 Pulses during IEEE 488 I O IEEE 488 command lines 14 17158 pin 24 Low with remote enabled IEEE 488 REN line 15 0158 pin 25 Low during interface clear IEEE 488 IFC line 16 0135 pin 84 Pulse train ADRXB 17 U135 pin 91 Pulse train ADTX 18 U135 pin 90 Pulse train ADCLK 19 1 135 pin 89 Pulse train ADTS Troubleshooting 4 13 Analog signal switching states Table 4 5 through Table 4 11 provide switching states of the various relays FETs and ana log switches for the basic measurement functions and ranges These tables can be used to assist in tracing an analog signal from the input to the A D multiplexer Table 4 5 DCV signal switching Range 0101 9102 014 0136 0109 101 9113 Q105 9104 0108 100mV ON OFF OFF OFF SET OFF OFF ON OFF IV ON ON OFF OFF OFF SET OFF OFF ON OFF 10V ON ON OFF OFF OFF SET OFF OFF ON OFF 100V OFF OFF ON ON OFF SET OFF OFF OFF ON 1000V OFF OFF ON ON OFF SET OFF OFF OFF ON K101 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Table 4 6
75. CALibration PROTected INITiate you can send CAL PROT INIT DC STEPO AC STEP14 and AC STEP15 are one time factory calibration points and are valid only in manufacturing calibration mode B 4 Calibration Reference Miscellaneous calibration commands Miscellaneous commands perform miscellaneous calibration functions such as program ming the calibration code and date These commands are discussed in detail in the following paragraphs CODE CALibration PROTected CODE Purpose Format Parameter Description To program the calibration code or password so that you can perform the calibration procedures cal prot code char string Up to a 8 character string including letters and numbers The CODE command enables the Model 2700 calibration procedures when performing these procedures over the bus In general this command must be sent to the unit before sending any other comprehensive or manu facturing calibration command The default calibration code is KI002700 NOTES The CODE command should be sent only once before performing either the com prehensive or factory calibration Do not send CODE before each calibration step To change the code first send the present code then send the new code The code parameter must be enclosed in single quotes Example COUNE CAL PROT CODE KI002700 Send default code of KI002700 CALibration PROTected COUNt Purpose Format Response Descr
76. Front panel tests There are two front panel tests one to test the functionality of the front panel keys and one to test the display In the event of a test failure refer to Display board checks for details on troubleshooting the display board KEY test The KEY test allows you to check the functionality of each front panel key Perform the fol lowing steps to run the KEY test 1 Press SHIFT and then TEST to access the self test options Use the up or down RANGE key to display TEST KEY 3 Press ENTER to start the test When a key is pressed the label name for that key is dis played to indicate that it is functioning properly When the key is released the message NO KEY PRESS is displayed 4 Pressing EXIT tests the EXIT key However the second consecutive press of EXIT aborts the test and returns the instrument to normal operation DISP test The display test allows you to verify that each segment and annunciator in the vacuum fluo rescent display is working properly Perform the following steps to run the display test 1 Press SHIFT and then TEST to access the self test options Use the up or down RANGE key to display TEST DISP 3 Press ENTER to start the test There are four parts to the display test Each time ENTER is pressed the next part of the test sequence is selected The four parts of the test sequence are as follows a Allannunciators are displayed b The segments of each digit are sequentially d
77. ILM R 263 1K R310 RES 9 09K 0 1 1 10W METAL FILM R 263 9 09K R311 RES 392 1 100MW THICK FILM R 418 392 R312 R313 RES 332K 1 100MW THICK FILM R 418 332K R318 RES 73 2K 1 100MW THICK FILM R 418 73 2K R321 261 294 297 322 331 332 RES 100 1 1000MW THICK FILM R 418 100 R363 367 R181 R333 RES 4 75 1 100MW THICK FILM R 418 4 75K R382 R389 R398 R399 RES 10K 1 100MW THICK FILM R 418 10K R391 R395 RES 100K 1 100MW THICK FILM R 418 100K R404 R173 RES 0 0499 1 1OOMW THICK FILM R 418 0499 RV101 RV102 VAR 576V METAL OXIDE VR 5 RV103 TRANSIENT VOLTAGE SUPPRESSOR VR 25 RV104 RV105 BIDIRECTIONAL TRANSIENT VOLT VR 8 SUPPRESSOR S101 SWITCH PUSHBUTTON 8 POLE SW 468 SA101 SA102 SURGE ARRESTOR CG3 1 5AL SA 4 SA103 SURGE ARRESTOR SA 8 50156 50157 SOCKET PLCC 032 T A SO 143 32 TP102 TP105 TP107 CONN TEST POINT CS 553 TP103 TP104 TP106 SURFACE MOUNT PCB TEST POINT CS 1026 U101 IC VOLTAGE REG LM317M IC 846 U102 U118 IC J FET OP AMP TLE2081CD IC 967 U103 U105 U111 U129 IC CMOS ANALOG SWITCH DG211DY IC 768 U104 IC MOSFET DRIVER TLP591B IC 877 Replaceable Parts 6 7 Table 6 1 Continued Model 2700 motherboard parts list Circuit Designation Description Keithley Part No U106 U109 U121 U130 U134 IC 8 STAGE SHIFT STORE MC14094BD IC 772 U107 U108 IC PHOTO DARLINGTON TRANS PS2506L 1 IC 911 0110 IC TRMS TO DC CONVERTER 637JR IC 796 0112 IC J FET LF357M IC 966 U113 U126 IC O
78. ION BETWEEN ANY TERMINAL AND EARTH gt 10 0 lt 200pF CROSSTALK 10MHz 500 Load lt 4008 INSERTION LOSS 500 Source 500 Load 0 1dB below 1M Hz 3dB below 2M Hz COMMON MODE VOLTAGE 300V between any terminal and chassis T C COLD JUNCTION 1 0 C 18 28 C Mainframe Temp 1 5 0 18 C amp 28 50 C Mainframe Temp ENVIRONMENTAL OPERATING ENVIRONMENT Specified for 0 C to 50 C Specified to 80 R H at 35 C STORAGE ENVIRONMENT 25 C to 65 C WEIGHT 0 45kg 11b Channels 23 25 in this schematic refer to the designations used for control and not actual available channels For moreinformation refer to the ROUTe MULTiple command section in the Model 2700 User s Manual Channels 24 and 25 can be individually controlled using ROUTe MULTipleif the moduleisnot to be connected to the internal DMM Specifications A 9 7702 40 Channel Differential Multiplexer GENERAL 40 CHANNELS 40 channels of 2 pole relay input All channels configurable to 4 pole 2 CHANNELS 2 channels of current only input RELAY TYPE Latching electromechani cal ACTUATION TIME Sms Ganar Lo Channels 2 19 CAPABILITIES CHANNELS 1 40 Multiplexone of 40 2 pole or one of 20 4 pole signals Pee io into DMM CHANNELS 41 42 Multiplex one of 2 2 pole current signals into DMM Channel 21 INPUTS Channels 2 39 MAXIMUM SIGNAL LEVEL Channels 1 40 300 DC rms 1 switched 60W
79. If the instrument is still under warranty and its performance is outside specified lim its contact your Keithley representative or the factory to determine the correct course of action If the unit is not under warranty and it fails to meet specified limits refer to the calibration procedures in Section 2 There are three general verification procedures in this section Model 2700 verification Covers procedures to verify measurement accuracy of the Model 2700 using the front panel terminals Model 7700 verification Discusses procedures to verify accuracy of measurement made through the Model 7700 20 Channel Multiplexer Note that the same general pro cedures can be used to verify measurement accuracy of other Model 2700 plug in mod ules that have similar functions For specific information about the individual modules refer to the appropriate appendices in the Model 2700 User s Manual Performance Verification 1 3 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 calibration equipment Using the specified reading limits Environmental conditions Conduct your performance verification procedures in a test environment that has Anambient temperature of 18 to 28 C 65 to 82 F Arelative humidity of less than 80 unless otherwise noted Warm up pe
80. J0 00 oJoooojoooo 010 00 0JO 090 0O O000 52225222 ei glo p 9 22 olo 5 alo 2 EN 0 T 00 80 er olo olo gt olo Ho ojo olo oo olo olo olo olo 5 Oo lt olo ool i ojo T 3 8 Routine Maintenance Replacing non volatile RAM battery The Model 2700 has a three year battery for non volatile RAM Use the procedure below to replace the battery if required Refer to the disassembly procedures in Section 5 and the parts list and component layout drawings at the end of Section 6 for more information WARNING The following procedure is intended only for qualified service personnel Do not perform this procedure unless you are qualified to do so Disconnect the line cord and all connecting wires from the Model 2700 before removing the top cover 1 Before replacing the battery refer to the troubleshooting procedures in Table 4 4 in Section 4 to determine if the battery requires replacement Remove the Model 2700 top cover using the disassembly procedures in Section 5 3 Locate battery BT100 using the motherboard component layout drawing at the
81. MPS connection by pulling the wires off the pin connectors To remove the front panel AMPS input wire white first remove the AMPS fuse holder then use needle nose pliers to grasp the AMPS wire near the fuse housing Push the wire forward and down to snap the spring out of the fuse hous ing Carefully pull the spring and contact tip out of the housing 4 Unplug cables Unplug the display board ribbon cable from connector J1014 Unplug the transformer cables from connectors J1002 and J1003 Unplug scanner slots ribbon cable from connector J1012 Unplug analog backplane connections J1008 and J1010 5 Remove the fastening screws that secure the motherboard to the chassis One of these screws is located along the left side of the unit towards the middle and it also secures U144 One screw is located at the right center of the chassis near the front rear switch S101 and another screw is behind the AC shield During re assembly replace the board and start the IEEE 488 RS 232 and Digital I O connector nuts and the mounting screw Tighten all the fasteners once they are all in place and the board is correctly aligned 6 Remove the motherboard which is held in place by edge guides on one side by sliding it forward until the board edges clear the guides Carefully pull the motherboard from the chassis Card cage removal After the motherboard has been removed the card cage that holds plug in modules can be removed simply by remov
82. Model 2700 Multimeter Data Acquisition System Service Manual Contains Servicing Information KEITHLEY WARRANTY Keithley Instruments Inc warrants this product to be free from defects in material and workmanship for a period of 1 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
83. NN RT ANGLE SEL CS 1061 1 CS 1062 QI P CHANNEL TMOSFET TG 392 R1 R7 R8 R4 R5 R6 R9 R10 R11 RES IK 1 100MW THICK FILM R 418 1K R2 RES 10K 1 100MW THICK FILM R 418 10K R3 RES 69 8K 1 1W THICK FILM R 418 69 8K 2 SURFACE MOUNT PCB TEST POINT CS 1026 Ul IC TINYLOGIC CMOS INVERTER IC 1282 U2 IC RETRIG MULTIVIB 74HC123AM IC 788 U3 IC 2 5V CASCADABLE SERIAL EEPROM LSI 212 U4 IC 2 INPUT AND GATE IC 1140 U6 U7 U8 U9 U10 IC 8 BIT INPUT LATCH DRIVER IC 1342 BOTTOM CARD COVER 7703 301B TOP CARD COVER 7703 302 MASS TERM BRACKET 7703 303 1 6 14 Replaceable Parts Table 6 8 Model 7705 parts list Circuit Designation Description Keithley Part No C100 CAP 4 7U 10 35V TANTALUM C 476 4 7 C102 106 107 108 109 110 111 121 101 CAP 0 1UF 5 100V CERAMIC C 465 1 C103 CAP 220U 20 10V TANTALUM C 558 220 C104 C105 C112 C120 CAP 47P 596 CERAMIC C 465 47P CR141 DIODE SWITCHING 250MA BAV103 RF 89 J1000 CONN RT ANGLE DUAL ROW RECEPT CS 1065 1 101 140 SINGLE COIL LATCH RELAY RL 225 P1000 P1001 CONN RT ANGLE SEL CS 1061 1 CS 1062 Q100 P CHANNEL TMOSFET TG 392 Q103 105 107 109 111 113 115 117 119 121 TRANS PNP SILICON TG 388 Q104 106 108 110 112 114 116 118 120 122 TRANS NPN SILICON TG 389 Q123 125 127 129 131 133 135 137 139 141 TRANS PNP SILICON TG 388 Q124 126 128 130 132 134 136 138 140 142 TRANS NPN SILICON TG 389 Q143 145 147 149 151 153 155 157 159 161 TRANS P
84. NP SILICON TG 388 Q144 146 148 150 152 154 156 158 160 162 TRANS NPN SILICON TG 389 Q163 165 167 169 171 173 175 177 179 181 TRANS PNP SILICON TG 388 Q164 166 168 170 172 174 176 178 180 182 TRANS NPN SILICON TG 389 R100 RES 69 8K 1 THICK FILM R 418 69 8K R101 R102 R103 R104 R105 R106 R107 RES IK 1 100MW THICK FILM R 418 1K R190 R108 R109 RES 2K 1 125mW METAL FILM R 391 2K R110 R189 RES 4 22K 1 125MW METAL FILM R 391 4 22K R191 RES 10K 1 100MW THICK FILM R 418 10K TP100 TP101 TP102 TP103 TP104 SURFACE MOUNT PCB TEST POINT CS 1026 U100 IC 2 5V CASCADABLE SERIAL EEPROM LSI 212 U102 IC RETRIG MULTIVIB 74HC123AM IC 788 U103 U104 IC 2 INPUT AND GATE IC 1140 U105 IC TINYLOGIC CMOS INVERTER IC 1282 U106 U107 U108 U109 U110 U111 IC 8 STAGE SHIFT C074HC409AM IC 1026 0112 N CHANNEL P CHANNEL POWER MOSFET TG 360 D SUB CABLE KIT 7703 306 BOTTOM CARD COVER 7703 301B TOP CARD COVER 7703 302 MASS TERM BRACKET 7703 303 2 Specifications A 2 Specifications 2700 Multimeter Data Acquisition System DC CHARACTERISTICS CONDITIONS MED 1 PLC or 10 PLC or MED 1PLC with Digital Filter of 10 ACCURACY 3 ppm of reading ppm of range INPUT ppm parts per million TEST CURRENT RESISTANCE eg 10ppm 0 001 TEMPERATURE OR BURDEN OR OPEN CKT 24Hour 90Day 1Year COEFFICIENT FUNCTION RANGE RESOLUTION VOLTAGE VOLTAGE 23 C 1 23 5 23 5 0 18 C amp 28 50 C Vol
85. NT 1 OUTPUT 4 OPER CASE 6 TO 9 PRINT 1 OUTPUT 4 Msg PRINT 1 OUTPUT 4 EXTSENSE ON PRINT 1 OUTPUT 4 OPER PRINT 1 OUTPUT 4 O0UT PRINT 1 ENTER 4 INPUT 2 R R s Cmd Cmd STR R CASE 10 13 23 J gt AMPS IF I 13 THEN J INPUT PRINT 1 OUTPUT 4 STBY PRINT Connect calibrator to J and INPUT LO jacks GOSUB KeyCheck PRINT 1 OUTPUT 4 Msg PRINT 1 OUTPUT 4 OPER END SELECT IF I gt 2 THEN GOSUB Settle PRINT 1 OUTPUT 16 CS Cmd OPC Send cal command to 2700 GOSUB CalEnd Wait until cal step ends GOSUB ErrCheck Check for cal error NEXT I 1 PRINT 1 OUTPUT 4 STBY LINE INPUT Enter calibration date yyyy mm dd D PRINT 1 OUTPUT 16 CAL PROT DATE D GOSUB ErrCheck LINE INPUT Enter calibration due date yyyy mm dd D PRINT 1 OUTPUT 16 CAL PROT NDUE D GOSUB ErrCheck PRINT 1 OUTPUT 16 CAL PROT SAVE Save calibration constants GOSUB ErrCheck PRINT 1 OUTPUT 16 CAL PROT LOCK Lock out calibration PRINT Calibration completed PRINT 1 OUTPUT 16 SYST PRES END KeyCheck WHILE INKEYS lt gt WEND PRINT PRINT Press any key to continue DO I INKEY LOOP WHILE I IF I CHR 27 THEN GOTO EndProg RETURN CalEnd PRINT Performing calibration step I DO PRINT 1 SRQ INPUT 2 s LOOP UNTIL s PRINT 1 OUTPUT 16 ESR PRINT 1 ENTER 16 IN
86. P AMP LTC1050CS8 IC 791 U114 U167 IC DUAL J FET OP AMP OP 282GS IC 968 0115 IC QUAD COMPARATOR LM339D IC 774 U116 IC DARLINGTON ARRAY ULN2003L IC 969 U117 U145 IC VOLT COMPARATOR LM311M IC 776 U119 IC 15V VOLTAGE REGULATOR IC 1334 U120 U131 U169 U186 IC VOLT COMPARATOR LM393D IC 775 U122 IC OCTAL D FLIP FLOP W CLEAR 74HCT273D IC 1028 U123 IC DUAL PICOAMP OP AMP AD706JR IC 910 U124 IC 5V VOLTAGE REGULATOR IC 1371 U125 IC 15V VOLTAGE REGULATOR IC 1241 U132 U138 U139 U190 IC OPA177GS IC 960 U133 IC CMOS ANAL SWITCH DG444DY IC 866 U135 IC 16 BIT MICROPROCESSOR MC68306FC16A_ LSI 154 U136 IC 2048 X 8 SERIAL E 2 PROM IC 1318 U137 U166 IC HI SPEED BIFET OP AMP AD711JR IC 894 0141 IC PRECISION REFERENCE LM399 196 600A U142 IC OP AMP NE5534D IC 802 U144 IC 5V VOLTAGE REGULATOR LM2940CT IC 576 U146 U179 IC POS NAND GATES INVERT 74HCT14 IC 656 U147 U164 U183 U184 U168 IC DUAL D TYPE F F 74HC74 IC 773 U149 IC NCHAN LAT DMOS QUADFET SD5400CY 893 U150 IC OPTOCOUPLER 2611 IC 690 U151 U152 IC 512K X 8 BIT CMOS SRAM LSI 234 70 U154 IC QUAD D FLIP FLOP W CLK RESET IC 923 74HC175 U155 IC OPTOCOUPLER 2601 IC 239 U156 PROGRAMMED ROM 2700 804 U157 PROGRAMMED ROM 2700 803 U158 IC GPIB ADAPTER 9914A 151 123 0159 5 RS 232 TRANSCEIVER MAX202 952 0160 OCTAL INTERFACE BUS 75160 IC 646 0161 OCTAL INTER BUS TRANS 75161 647 0163 IC 8 ANA MULTIPLEXER DG408DY IC 844 U1
87. PUT 2 s PRINT 1 SPOLL 16 INPUT 2 s RETURN ErrCheck PRINT 1 OUTPUT 16 SYST ERR PRINT 1 ENTER 16 INPUT 2 E Err IF E lt gt 0 THEN PRINT Err GOTO ErrCheck RETURN Settle DO PRINT 1 OUTPUT 4 ISR PRINT 1 ENTER 4 INPUT 2 s LOOP UNTIL s AND amp H1000 RETURN EndProg BEEP PRINT Calibration aborted PRINT 1 OUTPUT 4 STBY PRINT 1 OUTPUT 16 SYST PRES PRINT 1 LOCAL 4 16 CLOSE END CmdList DATA Connect low thermal short to inputs wait 3 minutes DC STEP1 1 1 1 Calibration Program Check for key press routine Flush keyboard buffer ESC to abort program Abort if ESC is pressed C 5 Check for cal step completion Request SRO status Input SRQ status byte Wait for operation complete Clear OPC Clear SRQ Error check routine Query error queue Display error Calibrator settling routine Query status register Test settle bit Close files end program DATA Disconnect low thermal short from inputs DC STEP2 DATA OUT 10 V 0 HZ DC STEP3 10 DATA OUT 10 V DC STEP4 10 DATA OUT 100 V DC STEP5 100 DATA OUT 1 KOHM DC STEP6 DATA OUT 10 KOHM DC STEP7 DATA OUT 100 KOHM DC STEP8 DATA OUT 1 MOHM DC STEP9 DATA OUT 10 MA DC STEP10 10E 3 DATA OUT 100 MA DC STEP11 100E 3 DATA OUT 1A DC STEP12 1 C 6 Calibration Program DATA DATA DATA DATA DATA DATA DATA
88. STEPO temp Here temp is the cold calibration temperature C measured in Step 3 8 Sendthe following commands to save calibration and lock out calibration CAL PROT CARDI SAVE CAL PROT CARD1 LOCK 2 24 Calibration 3 Routine Maintenance 3 2 Routine Maintenance Introduction The information in this section deals with routine type maintenance and includes procedures for setting the line voltage replacing the Model 2700 line and front terminal AMPS fuses and replacing the amps fuses for the Models 7700 and 7702 plug in modules Replacement of the Model 2700 non volatile RAM battery is also covered Setting the line voltage and replacing the line fuse 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 located in the power module next to the AC power receptacle see Figure 3 1 If the line voltage must be changed or if the line fuse requires replacement per form the following steps 1 Place the tip of a flat blade screwdriver into the power module by the fuse holder assembly see Figure 3 1 Gently push in and to the left Release pressure on the assembly and its internal spring will push it out of the power module 2 Remove the fuse and replace it with the type listed in Table 3 1 CAUTION For continued protection against fire or instrument damage replace the fuse only with the
89. UI3 UI5 U17 U18 IC CENTIGRADE TEMP SENSOR LM35DM IC 906 014 RETRIG MULTIVIB 74HCI23AM IC 788 U16 IC 2 5V CASCADABLE SERIAL EEPROM LSI 212 U24 IC QUAD 2 IN AND 74 08 IC 837 U6 IC 8 CHAN ANA MULTIPLEXER DG408DY IC 844 U7 U25 IC POS NAND GATES INV 74HCT14 IC 656 U9 U10 IC DUAL OPTO IC 1358 TOP COVER HEAT STAKE ASSEMBLY 7700 302A BOTTOM CARD COVER 7702 301 COMPRESSION SPRING SP 7 3 6 12 Replaceable Parts Table 6 6 Model 7702 parts list Circuit Designation Description Keithley Part No C1 C3 C9 C10 C11 C12 C13 C14 CAP 0 1UF 2096 50V CERAMIC C 418 1 C16 CAP 220U 20 10V TANTALUM C 558 220 C17 C18 C19 C20 C21 C22 C23 C24 C2 C6 CAP 47P 5 100V CERAMIC C 465 47P C25 CAP 47P 5 100V CERAMIC C 465 47P C4 CAP 0 1UF 2096 50V CERAMIC C 418 1 C5 CAP 4 7U 1096 35V TANTALUM C 476 4 7 CR1 CR22 CR45 DIODE DUAL SWITCHING BAV99L RF 82 CR2 CR21 CR23 CR42 DIODE DUAL SWITCHING BAV99L RF 82 CR43 CR44 CR46 CR47 DIODE SWITCHING MMBD914 RF 83 F1 F2 FUSE 3A FU 107 1 Ji CONN RT ANGLE DUAL ROW RECEPT CS 1065 1 K1 K41 K44 K47 SINGLE COIL LATCH RELAY RL 225 K42 K43 NON LATCHING RELAY RL 242 QI N CHANNEL P CHANNEL POWER MOSFET TG 360 Q2 Q7 DUAL PNP DIGITAL TRANS TG 385 03 04 06 DUAL PNP DIGITAL TRANS TG 386 Q34 36 38 40 42 44 46 50 52 54 56 56 60 TRANS PNP SILICON TG 388 Q35 37 39 41 43 45 47 51 53 55 57 59 65 TRANS NPN SILICON TG 389 Q5 P CHANNEL TMOSFET
90. ULT command section in the Model 2700 User s Manual Specifications 4 11 7705 40 Channel Control Module GENERAL RELAY SWITCH CONFIGURATION 40 independent channels of 1 pole switching Isolated from internal DMM CONTACT CONFIGURATION 1 pole Form A RELAY TYPE Latching electromechanical CONNECTOR TYPE Two 50 pin female D sub connectors INPUTS MAXIMUM SIGNAL LEVEL 300VDC or rms 2A switched 60W DC resistive 125VA AC resistive CONTACT LIFE Cold Switching 10 closures At Maximum Signal Levels 10 closures CHANNEL RESISTANCE per conductor 10 CONTACT POTENTIAL lt 4uV per contact OFFSET CURRENT lt 100 ACTUATION TIME 3ms ISOLATION Channel to Channel gt 10 0 lt 500 Common Mode gt 10 Q 100pF CROSSTALK 1MHz 500 load 35dB INSERTION LOSS 500 source 500 load 0 3dB below 1M Hz lt 3dB below 10M Hz COMMON MODE VOLTAGE 300V between any terminal and chassis ENVIRONMENTAL OPERATING ENVIRONMENT Specified for 0 C to 50 C Specified to 80 R H at 35 C STORAGE ENVIRONMENT 25 C to 65 C WEIGHT 0 45kg 11b IN 0 o Channel 1 OUT Channels 2 39 Channel 40 OUT e A 12 Specifications Accuracy calculations The information below discusses how to calculate accuracy for both DC and AC characteristics Calculating DC characteristics accuracy DC characteristics accuracy is calculated as follows Accura
91. a tor s output LO terminal Figure 1 8 Connections for Model 7700 DC volts verification CH1 Calibrator Output DC Voltage C CO OOO C 0000 D Note Use shielded low thermal cables Model 7700 for 100mV and ranges Performance Verification 1 19 2 Install the Model 7700 in Slot 1 of the Model 2700 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the DC volts function by pressing the DCV key and set the Model 2700 to the 100mV range Close Channel 1 by pressing the CLOSE key and then keying in 101 Set the calibrator output to 0 00000mV DC and allow the reading to settle 5 Enable the Model 2700 REL mode Leave REL enabled for the remainder of the DC volts verification tests 6 Source positive and negative and full scale voltages for each of the ranges listed in Table 1 9 For each voltage setting be sure that the reading is within
92. alibration steps summarized in Table 2 9 For each step Set the calibrator to the indicated resistance and make sure the unit is in operate Use the recommended resistance or the closest available value Send the indicated programming command Change the command parameter if you are using a different calibration resistance than that shown Wait until the Model 2700 completes each step before continuing Table 2 9 Resistance calibration programming steps Calibration Calibrator step resistance Calibration command Parameter range IkQ 1kQ CAL PROT DC STEP6 1E3 900 to 1 1E3 10kQ 10kQ CAL PROT DC STEP7 10E3 9E3 to 11E3 100kQ 100kQ CAL PROT DC STEP8 100E3 90E3 to 110E3 IMO IMQ CAL PROT DC STEP9 1E6 900E3 to 1 1E6 Use exact calibrator resistance value for parameter 2 15 2 16 Calibration DC current calibration After the 1MQ resistance point has been calibrated follow these steps for DC current calibration 1 Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2700 as shown in Figure 2 3 2 Perform the calibration steps listed in Table 2 10 For each step e Set the calibrator to the indicated current and make sure the unit is in operate Use the recommended current if possible Send the indicated programming command Change the current parameter if you are using a different calibration current Wait until the Model 2700 completes each step before continui
93. annels configurable to 4 pole RELAY TYPE Reed ACTUATION TIME lt ms CAPABILITIES CHANNELS 1 32 Multiplexone of 32 2 pole or one of 16 4 pole signals into DMM INPUTS MAXIMUM SIGNAL LEVEL Channels 1 32 300V DC or rms 0 5A switched 10W maximum Contact Life typ gt 5x10 operations at max signal level 2108 operations cold switching CONTACT RESISTANCE lt Q at end of contact life CONTACT POTENTIAL V typical per contact 6uV max lt 8UV typical per contact pair 60V max OFFSET CURRENT lt 100 CONNECTOR TYPE 50 pin D sub x 2 RELAY DRIVE CURRENT 20mA per channel ISOLATION BETWEEN ANY TWO TERMINALS gt 10 0 lt 200pF ISOLATION BETWEEN ANY TERMINAL AND EARTH gt 10 0 400pF CROSS TALK 1 MHz 500 Load lt 4008 INSERTION LOSS 500 Source 500 Load 0 35dB below 1M Hz 3dB below 2M Hz COMMON MODE VOLTAGE 300V between any terminal and chassis ENVIRONMENTAL OPERATING ENVIRONMENT Specified for 0 C to 50 C Specified to 4096 R H at 35 C STORAGE ENVIRONMENT 25 C to 65 C WEIGHT 0 8kg 1 75 Ibs oo Channel 35 2 Pole Closed 9 4Pole O o oT o 1 LO o o Channels 18 31 HI o 1 Channel 32 1 LO o o Channels 33 35 in this schematic to the designations used for control and not actual available channels For more information refer to the ROUTE M
94. bration Reference Table B 5 Continued Calibration error summary Error number and description 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 500 513 514 515 518 519 610 1 vac dac error 10 vac dac error 100 vac dac error 100m vac zero error 100m vac full scale error vac zero error vac full scale error vac noise error 10 vac zero error 10 vac full scale error 10 vac noise error 100 vac zero error 100 vac full scale error 750 vac zero error 750 vac full scale error 750 vac noise error Post filter offset error aac zero error aac full scale error 3 aac zero error 3 aac full scale error Input time constant error Frequency gain error 1K Ohm Ioff Ocomp FS error 10K Ohm Ioff Ocomp FS error Temperature Cold Cal error Calibration data invalid AC calibration data lost DC calibration data lost Calibration dates lost Card calibration data lost Card calibration dates lost Questionable calibration Model 7700 card only Calibration Reference B 23 Error queue As with other Model 2700 errors any calibration error will be reported in the bus error queue You can read this queue by using the SYST ERR query The Model 2700 will respond with the appropriate error m
95. bus or the RS 232 port DC only and AC only calibration may be performed individually if desired Environmental conditions Conduct the calibration procedures in a location that has Anambient temperature of 18 to 28 C 65 to 82 F Arelative humidity of less than 8096 unless otherwise noted Warm up period Allow the Model 2700 Multimeter Data Acquisition system to warm up for at least two hours before performing calibration If the instrument has been subjected to temperature extremes those outside the ranges stated above allow extra 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 2700 requires a line voltage of 100V 120V 220V 240V 10 and a line fre quency of 45Hz to 66Hz Note that the line frequency is automatically sensed at power up but the line voltage must be manually set to either 100V 120V or 220V 240V as described in Section 3 Calibration 2 3 Calibration considerations When performing the calibration procedures Make sure that the equipment is properly warmed up and connected to the appropriate input jacks Also make sure that the correct front or rear terminals are selected with the INPUTS switch Make sure the calibrator is in OPERATE before you complete
96. cation Model 2700 line fuse replacing Line power Line sync line voltage setting 3 2 Maintenance Routine Manufacturing calibration Extender board preparation front panel 2 20 Recommended test equipment remote Unlocking manufacturing calibration measurement accuracy optimizing measurement speed optimizing Measuring function generator signal amplitude 2 19 Memory circuits Microcontroller Microprocessor Model 7700 amps fuse 3 5 Model 7700 calibration commands B 16 Model 7702 amps fuses Module slot control Motherboard removal Multiplexer and A D converter No comm link error operation principles 4 4 Ordering information 6 2 Parts lists Performance Verification 1 1 power components removing Power module removal Power module wire colors Power supply 4 4 block diagram Power supply checks Power supply components Power transformer removal Power on self test 4 2 ratio and average verifying Model 7700 reading limit ACV Model 2700 calculating resistance calculation example DCV Model 2700 four wire RTD temperature verification Model 2700 1 17 Model 7700 thermocouple temperature verification Plug in module ACV Model 7700 Plug in module DCV Model 7700 Plug in module four wire RTD temperature verification Model 7700 thermocouple temperature verification Model 2700 Recommended test equipment Remote calibration AC current
97. change the 300V 50kHz step to 220V 50kHz Read ing limits for 220V 50kHz 219 36 to 220 64 1 22 Performance Verification Verifying DC current Check DC current accuracy by applying accurate DC currents from the DC current calibra tor to the input terminals of the Model 7700 and verifying that the displayed readings fall within specified limits Follow these steps to verify DC current accuracy 1 Connect the Model 7700 CH21 and L terminals to the calibrator as shown in Figure 1 10 Figure 1 10 Connections for Model 7700 DC current verification Model 7700 Calibrator Output DC Current SEN Gu gu gu wu gu Pu CH HLHLHLHL INPUT 7 2 WIRE EX iai Output HI C t C 5550 OOO CC OO Note Be sure calibrator is set for normal current output i 4 COR Output LO Performance Verification 1 23 2 Install the Model 7700 in Slot 1 of the Model 2700 then turn on
98. comprehensive calibration procedure Disconnect all cables and accessories from the input jacks before sending this command Example CAL PROT DC STEP2 Perform open circuit calibration STEP3 CALibration PROTected DC STEP3 Purpose To program the 10V comprehensive calibration step Format cal prot dc step3 Cal voltage Parameter Cal voltage gt 9 to 11 V Description STEP3 programs the 10V DC comprehensive calibration step The allowable range of the calibration voltage parameter is from 9 to 11 but 10 is recommended for best results Example CAL PROT DC STEP3 10 Program 10V step 5 4 CALibration PROTected DC STEP4 Purpose To program the 10V DC comprehensive calibration step Format cal prot dc step4 Cal voltage Parameter Cal voltage gt 9 to 11 V Description STEP4 programs the 10V DC comprehensive calibration step The allow able range of the calibration voltage parameter is from 9 to 11 but 10 is recommended for best results Example CAL PROT DC STEPA 10 Program 10V step B 10 Calibration Reference 5 5 CALibration PROTected DC STEP5 Purpose Format Parameter Description Example 5 6 program the 100V DC comprehensive calibration step cal prot dc step5 Cal voltage Cal voltage 90 to 110 V STEP5 programs the 100V DC comprehensive calibration step The allowable range of the calibration voltage parameter is from
99. cy ppm of reading ppm of range ppm parts per million and 10ppm 0 001 As an example of how to calculate the actual reading limits assume that you are measuring 5V on the 10V range You can compute the reading limit range from one year DCV accuracy specifications as follows Accuracy 30ppm of reading 5ppm of range 30ppm x 5V Sppm x 10V 150 500 V 200u V Thus the actual reading range is 5V 2001 7 or from 4 9998V to 5 0002V DC current and resistance calculations are performed in exactly the same manner using the pertinent specifications ranges and input signal values Calculating AC characteristics accuracy AC characteristics accuracy is calculated similarly except that AC specifications are given as follows Accuracy of reading of range As an example of how to calculate the actual reading limits assume that you are measuring 120V 60Hz on the 750V range You can compute the reading limit range from ACV one year accuracy specifications as follows Accuracy gt 0 06 of reading 0 03 of range 0 0006 x 120V 0 0003 x 750V 0 072 0 225V 0 297V In this case the actual reading range is 120V 0 297V or from 119 703V to 120 297V AC current calculations are performed in exactly the same manner using the pertinent speci fications ranges and input signal values Specifications 13 Calculating dBm characteristics accuracy As an example of ho
100. e main microprocessor using propri etary encoding schemes Digital circuitry Refer to Figure 4 2 for the following discussion on digital circuitry Microprocessor U135 is a 68306 microprocessor that oversees all operating aspects of the instrument The MPU has a 16 bit data bus and provides an 19 bit address bus It also has parallel and serial ports for controlling various circuits For example RXDA TXDA RXDB and TXDB lines are used for the RS 232 interface The MPU clock frequency of 14 7456MHz is controlled by crystal Y101 MPU RESET is performed momentarily on power up Memory circuits ROMs U156 and U157 store the firmware code for instrument operation U157 stores the DO D7 bits of each data word and U156 stores the D8 D15 bits RAMs 0151 U152 provide battery backed operating storage U152 stores the DO D7 bits of each data word and U151 stores the D8 D15 bits Semi permanent storage facilities include NVRAM U136 This IC stores such information as instrument setup and calibration constants Data transmission from this device is done in a serial fashion U171 Y103 and BT100 make up the battery watchdog control along with the real time clock U171 automatically senses when the 5VD supply is being powered down and then switches to BT100 for power 4 8 Troubleshooting RS 232 interface Serial data transmission and reception is performed by the TXDB and RXDB lines of the MPU U159 provides the nece
101. e performing calibration Do not send CODE before each calibration step The code parameter must be enclosed in single quotes Example CAL PROT CODE KI002700 Send default code of KI002700 COUNE CALibration PROTected CARD1 COUNt CALibration PROTected CARD2 COUNt Purpose To determine how many times a Model 7700 has been calibrated Format cal prot cardl coun cal prot card2 coun Response lt n gt Calibration count Description The CARD1 COUNt and CARD2 COUNt commands allow you to determine how many times a Model 7700 in Slot 1 and Slot 2 respectively has been calibrated NOTE Usethe COUNt command to help you monitor for unauthorized calibration procedures Example CAL PROT CARD1 COUN Request card 1 calibration count B 18 Calibration Reference DATE INIT CALibration PROTected CARD1 DATE CALibration PROTected CARD2 DATE Purpose To request the Model 7700 calibration date Format cal prot cardl date cal prot card2 date Response lt year gt lt month gt lt day gt Description The CARD1 DATE and CARD2 DATE queries allow you to read back the calibration date from a Model 7700 in Slot 1 and Slot 2 respectively NOTE The card calibration date is automatically set to the Model 2700 real time clock date when the card is calibrated Example CAL PROT CARD1 DATE Request card 1 cal date CALibration PROTected CARD1 INITiate Purpose To initiate
102. e shorted calibration extender board see Extender board preparation earlier in this section in scanner card Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium Press in and hold the OPEN key while turning on the power 3 Enable calibration by sending the CODE command For example the default com mand is CAL PROT CODE K1002700 4 Initiate calibration by sending the following command CAL PROT INIT 5 Calibrate step 0 with the following command CAL PROT DC STEPO 6 Perform the entire remote comprehensive calibration procedure discussed earlier in this section See Comprehensive calibration earlier in this section 7 Connect the function generator to the Model 2700 INPUT jacks as shown in Figure 2 5 Select the front input jacks with the INPUTS switch 8 Set the generator to output a RMS 3Hz sine wave then send the following com mand CAL PROT AC STEP 14 Cal voltage Here Cal voltage is the actual 3Hz generator signal amplitude you measured previously 9 Set the generator to output a 1V RMS 1kHz sine wave then send the following command CAL PROT AC STEPI5 1E3 10 Send the following commands to set calibration dates save calibration and lock out calibration CAL PROT DATE year month day CAL PROT NDUE year month day CAL PROT SAVE CAL PROT LOCK 2 22 Calibration Model 7700 calibration The
103. ed from Plug In Coefficient Type Range Resolution Reference Junction Module 0 18 C amp 28 50 J 200to 4760 C 0 001 0 2 C 1 0 C 0 03 C C 200to 1372 C 0 001 026 106 0 03 C C N 200 1300 C 0 001 C 0 2 C 10 0 03 C C T 200to 400 C 0 001 C 0 2 C 1 0 C 0 03 C C E 200 1000 C 0 001 0 2 C 10 0 03 C C R Oto 1768 C 01 0 6 C 1 8 C 0 03 C C S Oto 1768 01 C 0 6 C 1 8 C 0 03 C C B 4350to 1820 C 01 C 0 6 C 1 8 C 0 03 C C 4 Wire RTD 1000 platinum PT100 D100 F100 PT385 PT3916 or user type Offset compensation On 200to 630C 00122060 O0XQ C SSS Thermistor 2 2kO 5kQ and 10 80 to 150 C 0 01 C 0 08 C 0 002 C C Specifications A 3 DC SPEED vs NOISE REJECTION RMS Noise Rate Filter Readings s2 Digits 10VRange NMRR CMRR 10 50 0 1 0 08 6 5 lt 1 2uV 110 0813 140 dB 1 Off 15 12 6 5 lt 4 uV 90 140 dB 0 1 Off 500 400 55 lt 22 uV 80 dB 0 01 off 2000 1800 4 5 lt 150 uV 80 dB DC OPERATING CHARACTERISTICS 60Hz 50Hz Operation FUNCTIONDIGITS READINGS s PLCs DCV DCI Ohms lt 10M 6 51226 5 4 10 Thermocouple 6 516 30 24 Hi Thermistor 6 51216 50 40 1 5 51216 100 80 0 1 5 5161 250 200 0 1 5652 480 400 0 1 4507 2000 1800 0 01 4W Ohms lt 10 6 516 14 1 1 10 6 516 45 1 1 551 33 25 0 1 RTD 6 516 0 9 0 7 10 6 516 8 64 il 5 5161 18 14 4 0 1 Channel Ratio 6
104. el INPUTS switch is set to the REAR position 3 Set the calibrator for 4 wire resistance with external sense on Select the Model 2700 4 wire resistance function by pressing the Q4 key Close Chan nel 1 by pressing the CLOSE key and keying in 101 5 Set the Model 2700 for the 1000 range and make sure the FILTER 15 on Enable OCOMP offset compensated ohms for the 1000 range test Press SHIFT then OCOMP 6 Recalculate reading limits based on actual calibrator resistance values 1 26 Performance Verification 10 11 12 Figure 1 13 Source the nominal full scale resistance values for the 100Q 10MQ ranges summarized in Table 1 13 and verify that the readings are within calculated limits Connect the Model 7700 CH11 terminals to the calibrator as shown in Figure 1 13 Disable external sense on the calibrator Set the Model 2700 for the 100MQ range Source a nominal 100MQ resistance value and verify that the reading is within calcu lated limits for the LOOMQ range Press the OPEN key to open Channel 1 Connections for Model 7700 resistance verification IOOMQ range CH1 Model 7700 Calibrator Output 2 wire Resistance
105. en gas Allow the board to dry for several hours in a 50 C low humidity environment before use Re install the circuit board into the plastic housing then close the top cover Replacing Model 7702 amps fuses 1 Bow Turn off the power and disconnect the power line and external connections from the Model 7702 Open the Model 7702 top cover Locate the amps fuses for CH41 and 1142 see Figure 3 4 Remove the circuit board from the bottom plastic housing by removing the two bottom screws De solder the blown CH41 or CH42 fuse as required taking care not to damage the cir cuit board or spread solder flux around the board Install a new 3A 250V fast blow fuse Keithley part number FU 107 1 CAUTION Do not use a fuse with a higher current rating than specified or module damage may occur Solder the new fuse in place using organic OA based flux solder again taking care not to damage the circuit board or spread solder flux around the board Carefully clean the repaired area of the circuit board with a foam tipped swab or brush dipped in pure water then blow dry the board with dry nitrogen gas Allow the board to dry for several hours in a 50 C low humidity environment before use Re install the circuit board into the plastic housing then close the top cover 3 7 Routine Maintenance Model 7702 amps fuses Figure 3 4 ooonjiooonujoooujooou 0
106. er from the chassis Power module removal Perform the following steps to remove the power module 1 2 3 4 Remove the motherboard Remove the POWER switch rod Remove the card cage see Card cage removal above Disconnect the power module s ground wire This green and yellow wire connects to a threaded stud on the chassis with a kep nut Squeeze the latches on either side of the power module while pushing the module from the access hole Disassembly 5 7 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 To ensure continued protection against electrical shock verify that power line ground green and yellow wire attached to the power module and the power transformer ground black wire are connected to the chassis When installing the power transformer be sure to reconnect the black ground wire to the mounting stud on side of the chassis Be sure to install the bot tom case screws to assure a good case to chassis ground connection Input terminal wire connections During reassembly use the information in Table 5 1 to connect input terminal wires Table 5 1 Input terminal wire colors Input terminal Wire color INPUT HI Red INPUT LO Black SENSE HI Yellow SENSE LO Gray AMPS White
107. erifying resistance Check resistance by connecting accurate resistance values to the Model 7700 and verifying that its resistance readings are within the specified limits CAUTION Do not apply more than 300V between plug in module INPUT or SENSE H and L terminal or between any adjacent channels or instrument dam age could occur Follow these steps to verify resistance accuracy 1 Using shielded Teflon or equivalent cables in 4 wire configuration connect the Model 7700 CH1 H and L INPUT terminals and CH11 H and L SENSE terminals to the calibrator as shown in Figure 1 12 Figure 1 12 Connections for Model 7700 resistance verification 1000 to 10M amp ranges CH1 Model 7700 Sense HI Resistance Calibrator SENSE Ub 2 Sense LO Note Use shielded low thermal cables to minimize noise Enable or disable calibrator external sense as indicated in procedure 2 Install the Model 7700 in Slot 1 of the Model 2700 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front pan
108. erminals INPUT HI and INPUT LO because instrument damage may occur Follow these steps to verify DC voltage accuracy 1 Connect the Model 2700 HI and LO INPUT jacks to the DC voltage calibrator as shown in Figure 1 1 Make sure the INPUTS switch is set to the FRONT position NOTE Use shielded low thermal connections when testing the 100mV and 1V ranges to avoid errors caused by noise or thermal effects Connect the shield to the calibra tor s output LO terminal Figure 1 1 Connections for Model 2700 DC volts verification Input HI Calibrator Output DC Voltage Model 2700 Output HI e 588656688 2 3 Ga GL Gu EED eoo Q LO Note Use shielded low thermal cables for 100mV and 1V ranges 2 Select the DC volts function by pressing the DCV key and set the Model 2700 to the 100mV range 3 Set the calibrator output to 0 00000mV DC and allow the reading to settle Enable the Model 2700 REL mode Leave REL enabled for the remainder of the DC volts verification tests Performance Verification 1 9 5 Source positive and negative and full scale voltages for each of the ranges listed in Table 1 2 For each voltage setting be sure that the reading is within stated limits Table 1 2 DCV reading limits
109. ernal sense on and off disconnect the sense leads when external sensing is to be turned off and connect the sense leads when external sensing is to be turned on Calibration 2 Perform the calibration steps summarized in Table 2 8 For each step Set the calibrator to the indicated voltage and make sure the unit is in operate Use the recommended voltage if possible e Send the indicated programming command Change the voltage parameter if you are using a different calibration voltage Wait until the Model 2700 completes each step before continuing NOTE Ensure the calibrator has settled to the final value You can do so by verifying that the Settled indicator is off or by using the OPC operation complete query Table 2 8 DC voltage calibration programming steps Calibration step Calibrator voltage Calibration command Parameter range 10V 10 00000V CAL PROT DC STEP3 10 9 to 11 10V 10 00000V CAL PROT DC STEP4 10 9 to 11 100V 100 0000V CAL PROT DC STEP5 100 90 to 110 Use recommended value where possible Change parameter accordingly if using a different calibrator voltage Resistance calibration Follow these steps for resistance calibration 1 Set the calibrator to the resistance mode and turn on external sensing NOTE Use external sense 4 wire when calibrating all resistance ranges Be sure that the calibrator external sense mode is turned on 2 Perform the c
110. essage as summarized in Table B 5 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 or serial polling 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 SYST ERR 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 when an error occurs send the following command SRE 4 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 Detecting calibration step completion When sending remote calibration commands you must wait until the instrument completes the current operation before sending a command You can use either OPC or OPC to help determine when each calibration step is completed Using the OPC query With the OPC operation complete query the instrument will place an ASCII 1 in the out put queue when it has completed each step To determine when the OPC response is ready do 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 or by serial pollin
111. eys Make sure the calibrator is in operate before you verify each measurement Always let the source signal settle before taking a reading e Some of the procedures in this section may expose you to dangerous voltages Use standard safety precautions when such dangerous volt ages are encountered to avoid personal injury or death caused by elec tric shock e For the front panel terminals only the maximum common mode volt age voltage between INPUT LO and chassis ground is 500V peak Exceeding this value may cause a breakdown in insulation creating a shock hazard e For the plug in modules the maximum common mode voltage volt age between any plug in module terminal and chassis ground is 300V DC or 300V RMS Exceeding this value may cause a breakdown in insulation creating a shock hazard When using the front panel terminals simultaneously with plug in modules all cable insulation voltage ratings must equal or exceed the maximum voltage applied to either the front panel terminals or the plug in module terminals 1 8 Performance Verification Model 2700 verification Perform these tests to verify accuracy using the Model 2700 front panel terminals Verifying DC voltage Check DC voltage accuracy by applying accurate voltages from the DC voltage calibrator to the Model 2700 INPUT jacks and verifying that the displayed readings fall within specified limits CAUTION Do not exceed 1000V peak between front t
112. fault code KI002700 Substitute the correct code if changed Send the following command to initiate calibration CAL PROT INIT 2 14 Calibration Short and open calibration 1 Connect the Model 8610 low thermal short to the instrument INPUT and SENSE termi nals as shown in Figure 2 1 Make sure the INPUTS button is not pressed in so that the front inputs are active Wait at least three minutes before proceeding to allow for ther mal equilibrium NOTE sure to connect the low thermal short properly to the HI LO and SENSE termi nals Keep drafts away from low thermal connections to avoid thermal drift which could affect calibration accuracy 2 Send the following command CAL PROT DC STEPI 3 After the Model 2700 completes this step remove the low thermal short and then send this command CAL PROT DC STEP2 NOTE Be sure to minimize movement near front Input terminals Excessive movements can cause capacitive coupling errors which could affect calibration accuracy DC volts calibration After the front panel short and open steps do the following 1 Connect the calibrator to the Model 2700 as shown in Figure 2 2 Allow three minutes for thermal equilibrium NOTE Although 4 wire connections are shown the sense leads are connected and discon nected at various points in this procedure by turning calibrator external sense on or off as appropriate If your calibrator does not have provisions for turning ext
113. fer to the component layout drawing at the end of Section 6 for exact locations 4 Carefully push down on each ROM IC to make sure it is properly seated in its socket CAUTION Be careful not to push down excessively or you might crack the mother board 5 Connect the line cord and turn on the power If the problem persists additional trouble shooting will be required Disassembly 5 2 Disassembly Introduction This section explains how to handle clean and disassemble the Model 2700 Multimeter Data Acquisition System 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 touch ing the PC board traces while you are repairing the instrument Some circuit board areas espe cially those under the motherboard shield have high impedance devices or sensitive circuitry where contamination could cause degraded performance Handling PC boards Observe the following precautions when handling PC boards e 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 soldering a circuit board Use an OA based organic activated flux and take care not to spread the
114. following procedures calibrate the temperature sensors on the Model 7700 plug in modules NOTE For additional information about the Keithley modules refer to the appropriate appendix in the Model 2700 User s Manual Recommended test equipment In order to calibrate the Model 7700 you will need equipment summarized in Table 2 14 Table 2 14 Recommended equipment for Model 7700 calibration Digital Thermometer 18 to 28 C 0 1 C Keithley 7797 Calibration Extender Board Extender board connections The Model 7700 being calibrated should be connected to the 7797 Calibration Extender Board and the extender board should then be installed in scanner Slot 1 Note that the module being calibrated will be external to the Model 2700 to avoid card heating during calibration Model 7700 calibration NOTE Before calibrating the Model 7700 make sure that power has been removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibration procedure complete the procedure as quickly as possi ble to minimize card heating that could affect calibration accuracy Allow the Model 2700 to warm up for at least two hours Front panel Model 7700 calibration 1 Connect the Model 7700 to the Model 7797 Calibration Extender Board see Extender board connections above 2 With the power off install the Model 7700 7797 combination in Slot 1 and select the rear inputs with
115. g 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 B 24 Calibration Reference Using the OPC command The OPC operation complete command can also be used to detect the completion of each calibration step To use OPC to detect the end of each calibration step you must do 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 Send the OPC command immediately following each calibration command For example CAL PROT DC STEP1 OPC 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 calibration command After sending a calibration command repeatedly test the ESB Event Summary bit bit 5 in the status byte until it is set Use either the STB query or serial polling to request the status byte Once operation complete has been detected clear OPC status using one of two meth ods 1 Use the ESR query then read the response to clear the standard event status register or 2
116. g Model 7700 1 Software requirements ACA signal switching calibration program Accuracy calculations Model 2700 ACV and signal multiplexing and Calibration Reference B 1 gain Card cage removal ACV and signal switching 4 13 AMPS input 4 Case cover removal Command summary B 2 Analog circuitry 4 8 Component layouts 6 2 block diagram Analog signal switching states Connections AC volts calibration 2 11 DC and AC amps calibration DC volts and ohms calibration Input terminal wire 5 7 manufacturing calibration Model 2700 AC current verification Model 2700 AC volts verification Model 2700 DC current verification Model 2700 DC volts verification 1 8 Model 2700 frequency cai EI Model 2700 resistance verification 100MW range Model 2700 resistance verification 100W to 10MW ranges Model 7700 AC current verification Model 7700 AC volts verification Model 7700 DC current verification Model 7700 DC volts verification 1 18 Model 7700 frequency verification Model 7700 ratio and average verification Model 7700 resistance verification 100MW range Model 7700 resistance verification 100W to 10MW ranges Model 7700 thermocouple temperature verification Power module wire connections low thermal short dB characteristics accuracy dBm characteristics accuracly A 13 B 8 DC characteristics accuracy DC current B 14 verifying M
117. g the cursor and range keys set the display as follows SENS 4W RTD Press ENTER and note the unit displays TYPE PT100 Using the cursor and range keys set the unit for the following display TYPE PT385 f Press ENTER to complete the temperature configuration process 3 Select the temperature function by pressing the TEMP key Performance Verification 1 17 4 Setthe decade resistance box to each of the values shown in Table 1 8 and verify that the temperature readings are within the required limits Table 1 8 Four wire RTD temperature verification reading limits Applied resistance Reading limits 1 year 18 C to 28 C 22 800 190 06 to 189 94 100 000 0 06 to 0 06 C 313 590 599 94 to 600 06 Based on 0 00385 See text Verifying frequency Follow the steps below to verify the Model 2700 frequency function 1 Connect the function generator to the Model 2700 INPUT jacks See Figure 1 7 Be sure the INPUTS switch is in the FRONT position Set the function generator to output a IKHz 1V RMS sine wave 3 Select the Model 2700 frequency function by pressing the FREQ key Verify that the Model 2700 frequency reading is between 999 9Hz and 1 0001kHz Figure 1 7 Connections for Model 2700 frequency verification BNC to Dual Banana Plug Adapter Model 2700 Function Generator Integra Series
118. gt CALibration PROTected AC STEP lt n gt Purpose To program individual AC calibration steps Format cal prot ac step n Parameter IOmV at 1kHz calibration step 100mV AC at 1kHZ calibration step 100mV AC at 50kHz calibration step 1V AC at 1kHz calibration step 1V AC at 50kHz calibration step 10V AC at 1kHz calibration step 10V AC at 50kHz calibration step 100V AC at 1kHz calibration step 9 100 AC at 50khz calibration step 10 700V AC at 1kHz calibration step 11 100mA AC at 1kHz calibration step 12 1A AC at IKHz calibration step 13 2A AC at 1kHz calibration step amp Description The command programs the 13 individual AC calibration steps n represents the calibration step number The appropriate signal must be connected to the instrument when programming each step as summarized in the parameters listed above Example CAL PROT AC STEP7 Program 10V 50kHz step Calibration Reference B 15 Manufacturing calibration commands Three calibration steps are only performed at the factory or when the unit has been repaired CALibration PROTected AC STEP14 1V AC at 3Hz CALibration PROTected AC STEP15 1V AC at 1kHz CALibration PROTected DC STEPO Rear scanner terminal short circuit AC STEP lt 141 15 gt CALibration PROTected AC STEP lt 1 4 15 gt Purpose To program individual AC manufacturing calibration steps Format cal prot ac step
119. gure 1 5 Connections for Model 2700 resistance verification 1000 to 10M amp ranges Sense HI Sense HI Resistance Calibrator Model 2700 Integra Series C 63 ooo oo Oc sense LO Note Use shielded low thermal cables to minimize noise Enable or disable calibrator external sense as indicated in procedure Setthe calibrator for 4 wire resistance with external sense on 3 Select the Model 2700 4 wire resistance function by pressing the 94 key then choose the SLOW integration rate with the RATE key 4 Set the Model 2700 for the 1000 range and make sure the FILTER is on Enable OCOMP offset compensated ohms for 1000 range verification Press SHIFT then 5 Recalculate reading limits based on actual calibrator resistance values 1 14 Performance Verification 6 Source the nominal full scale resistance values for the 100Q 10MQ ranges summarized in Table 1 6 and verify that the readings are within calculated limits 7 Connect the Model 2700 INPUT and SENSE jacks to the calibrator as shown in Figure 1 6 8 Disable external sense on the calibrator 9 Set the Model 2700 for the 100 range 10 Source a nominal 100MQ resistance value and verify that the reading is within calcu lated limits for the LOOMQ range Figu
120. he 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 practice is to expect that hazardous voltage is present in any unknown circuit before measuring 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 the 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 19
121. ilaments is taken from a power transformer secondary at F1 and F2 and then routed to the display board Each DC supply uses a rectifier and a capacitive filter and many supplies use an IC regula tor Table 4 1 summarizes rectifier filter and regulator circuits for the various DC supplies Table 4 1 Power supply components Supply Rectifier Filter Regulator 5VD CR104 C128 C156 C175 C281 0144 37V CR116 CR117 C104 0101 15 7V CR102 CR115 C148 U125 15 7V CR102 CR115 C131 0119 5V 5VRL 52 CR103 146 0124 18V CR102 C148 18V CR102 C131 4 6 Troubleshooting Display board Display board components are shown in the digital circuitry block diagram in Figure 4 2 Figure 4 2 Digital circuitry block diagram Battery Back Control Realtime Clock U171 NVRAM ROM RAM 30 U156 U157 U151 U152 XADTX P Line Sync i lt m Control Analo XADCLK i un Display Board Display lt XADTS S U181 lt Controller DS401 See Figure 4 3 0 182 135 XADRX 1 ATIOI 0184 RIT U150 U186 XTAL Y101 IN RS 232 RS 232 TRIG IN OUT U159 Port Trigger U146 U164 TRIG OUT Data IN GPIB IEEE 488 Daa U158 0160 Bus Trigger Lin Digital Output Data Bus U122 U188 gt U189 Digital Digital Input vo Ui46 U191 lt U192 Microcontr
122. ing the calibration procedure send the following command to save the new calibration constants CAL PROT SAVE NOTE Calibration constants will not be saved unless the CAL PROT SAVE command is sent Locking out calibration After saving calibration send the following command to lock out calibration CAL PROT LOCK Manufacturing calibration The manufacturing calibration procedure is normally performed only at the factory but the necessary steps are included here in case the unit is repaired and the unit requires these calibra tion procedures NOTE Ifthe unit has been repaired the entire comprehensive calibration procedure should also be performed in addition to the manufacturing calibration procedure Recommended test equipment Table 2 13 summarizes the test equipment required for the manufacturing calibration steps In addition you will need the calibrator see Table 2 1 and signal generator to complete the comprehensive calibration steps Table 2 13 Recommended equipment for manufacturing calibration Stanford Research Systems DS345 Function Generator 1V RMS 3Hz 5 IV RMS 1kHz 5 Keithley Model 2001 or 2002 Digital Multimeter 1V 3Hz AC 0 13 Keithley 7797 Calibration Extender Board Keithley 7798 250B Calibration Extender Test Board Calibration 2 19 Extender board preparation Before performing manufacturing calibration short the output HI LO SHI and SLO terminals of
123. ing the screws that attach the card cage to the case bottom and removing it 5 6 Disassembly Front panel disassembly Use the following procedures to remove the display board and or the pushbutton switch pad NOTE must first remove the case cover the front rear input switch and the front input terminal wires as described earlier in this section Unplug the display board ribbon cable from connector J1014 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 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 Remove the switch pad by pulling it from the front panel Removing power components The following procedures to remove the power transformer and or power module require that the case cover and motherboard be removed as previously explained Power transformer removal Perform the following steps to remove the power transformer 1 Remove the motherboard Remove the two nuts that secure the transformer to the side of the chassis Pull the black ground wire off the threaded stud and remove the power transform
124. input value Using the Model 2700 one year accuracy specification for 10V DC of 30ppm of reading 5ppm of range the calculated limits are Reading limits 2 10V 10V x 30ppm 10V x 5ppm Reading limits 10V 0 0003 0 00005 Reading limits 10V 0 00035V Reading limits 9 99965V to 10 00035V Calculating resistance reading limits Resistance reading limits must be recalculated based on the actual calibration resistance val ues supplied by the equipment manufacturer Calculations are performed in the same manner as shown in the preceding example except of course that you should use the actual calibration resistance values instead of the nominal values when performing your calculations For example assume that you are testing the 10 range using an actual 10 03kQ calibra tion resistance value Using Model 2700 one year 10kQ range accuracy of 100ppm of read ing 6ppm of range the calculated reading limits are Reading limits 10 03kO 10 03kQ x 100ppm 10kQ x 6ppm Reading limits 10 02894k to 10 03106kQ Restoring factory defaults Before performing the verification procedures restore the instrument to its factory defaults as follows 1 Press SHIFT and then SETUP The instrument will display the following prompt RESTORE FACT 2 Using either range key select FACT then restore the factory default conditions by pressing ENTER 1 6 Performance Verification Performing the verifica
125. iption To determine how many times the Model 2700 has been calibrated cal prot coun n Calibration count The COUNt command allows you to determine how many times the Model 2700 has been calibrated NOTE Use the COUNt command to help you monitor for unauthorized calibration procedures Example CAL PROT COUN Request calibration count Calibration Reference B 5 INIT CALibration PROTected INITiate Purpose To initiate comprehensive and factory calibration procedures Format cal prot init Parameter None Description The INIT command enables Model 2700 calibration when performing these procedures over the bus This command must be sent to the unit after sending the CODE command but before sending any other calibration command NOTE The INITcommand should be sent only once before performing either DC AC or factory calibration Do not send INIT before each calibration step Example CAL PROT INIT Initiate calibration CALibration PROTected LOCK Purpose To lock out comprehensive or manufacturing calibration Format cal prot lock Parameter None Description The LOCK command allows you to lock out both comprehensive and man ufacturing calibration after completing those procedures Thus LOCK per forms the opposite of enabling calibration with the CODE command NOTE unlock comprehensive calibration send the CODE command To unlock manu facturing calibration ho
126. isplayed c The 12 digits and annunciators are sequentially displayed d annunciators located at either end of the display are sequentially displayed 4 When finished abort the display test by pressing EXIT The instrument returns to nor mal operation 4 4 Troubleshooting Principles of operation The following information is provided to support the troubleshooting tests and procedures covered in this section of the manual Refer to the following block diagrams Figure 4 1 Power supply block diagram Figure 4 2 Digital circuitry block diagram Figure 4 3 Analog circuitry block diagram Power supply The following information provides some basic circuit theory that can be used as an aid to troubleshoot the power supply A block diagram of the power supply is shown in Figure 4 1 Figure 4 1 Power supply block diagram CR104 5VD C156 C175 C281 U144 O D Common O 37V CR116 CR117 C104 U101 D Common Line Power Voltage Power Switch Select Transformer 18V Switch CR102 CR115 O 15 7 C131 C148 A Common U119 U125 OEN 18V 5V O A Common Troubleshooting 4 5 AC power is applied to the AC power module receptacle Power is routed through the line fuse and line voltage selection switch of the power module to the power transformer The power transformer has a total of four secondary windings for the various supplies AC voltage for the display f
127. l4 Cal voltage cal prot ac stepl5 Cal frequency Parameter Cal voltage 1 1V nominal Cal frequency 1E3 1kHz nominal Description The AC STEP14 and AC STEP 15 commands program the two man ufacturing AC calibration steps The appropriate signal must be connected to the instrument when programming each step as summarized by the parameters listed above Example CAL PROT AC STEP14 1 Program AC step 14 CAL PROT AC STEP15 1E3 Program AC step 15 DC STEPO CALibration PROTected DC STEPO Purpose To perform rear scanner terminal short circuit calibration Format cal prot dc stepO Parameter None Description STEPO performs the rear scanner terminal short circuit calibration step in the manufacturing calibration procedure Install an extender card with low thermal shorts on the output terminals installed in Slot 1 and select the rear scanner inputs before sending this command Example CAL PROT DC STEPO Perform rear short circuit calibration B 16 Calibration Reference Model 7700 calibration commands Table B 4 summarizes calibration commands for the Model 7700 plug in module Note that CARDI commands calibrate the card in Slot 1 while CARD2 commands request calibration count and date information from a card in Slot 2 NOTE Model 7700 must be installed in Slot 1 through a Model 7797 calibrationlextender card to be calibrated See Model 7700 calibration in Section 2 Table B
128. ld in the OPEN key while turning on the power Example CAL PROT LOCK Lock out calibration B 6 Calibration Reference LOCK CALibration PROTected LOCK Purpose To read comprehensive calibration lock status Format cal prot lock Response 0 Comprehensive calibration locked 1 Comprehensive calibration unlocked Description The LOCK query requests status from the Model 2700 on calibration locked unlocked state Calibration must be enabled sending the CODE command before calibration can be performed Example CAL PROT LOCK Request cal lock state CALibration PROTected SAVE Purpose To save calibration constants in EEROM after the calibration procedure Format cal prot save Parameter None Description The SAVE command stores internally calculated calibration constants derived during both comprehensive and manufacturing calibration in EEROM EEROM is non volatile memory Calibration constants will be retained indefinitely once saved Generally SAVE is sent after all other calibration steps except for LOCK NOTE Calibration will be only temporary unless the SAVE command is sent to perma nently store calibration constants Example CAL PROT SAVE Save calibration constants Calibration Reference B 7 DATE CALibration PROTected DATE Purpose To send the calibration date to the instrument Format cal prot date year month day Parameter year 1999 to 2098
129. lect ALL at the CAL RUN prompt 5 Press ENTER to perform the first manufacturing calibration step Perform the entire front panel comprehensive calibration procedure discussed earlier in this section See Comprehensive calibration earlier in this section 7 Connect the function generator to the Model 2700 front panel INPUT jacks as shown in Figure 2 5 Select the front input jacks with the INPUTS switch Figure 2 5 Function generator connections for manufacturing calibration BNC to Dual Banana Plug Adapter Model 2700 Function Generator 36 4 gt lt 6 ge Cable Function Output Note Output voltage must be accurately measured See text 8 After the last AC current calibration step the instrument will prompt you to enter 3Hz at 1V RMS and 1KHz with the following prompts Low frequency cal Set the function generator to output a 1V RMS 3Hz sine wave Use the left and right arrow keys and the range keys to adjust the display to agree with the generator amplitude you measured previously then press ENTER e Frequency cal Set the function generator to output a RMS 1kHz sine wave Enter 1 000000kHz at the prompt then press ENTER 9 Set the calibration dates then save calibration to complete the process Calibration 2 21 Remote manufacturing calibration 1 Install th
130. meter has had factory setups restored DC voltage DC current and resistance Select 3 1 2 digits 0 01 PLC filter OFF fixed range AC voltage and AC current Select 3 1 2 digits 0 01 PLC filter OFF fixed range Temperature e Select 3 1 2 digits 0 01 PLC filter OFF For all functions turn off the display and autozero and set the trigger delay to zero Use the SAMPIe COUNt and READ bus commands A 16 Specifications Calibration Reference B 2 Calibration Reference Introduction This appendix contains detailed information about the various Model 2700 remote calibra tion commands Section 2 of this manual covers detailed calibration procedures For informa tion about additional commands to control other instrument functions refer to the Model 2700 User s Manual Command summary Table B 1 summarizes Model 2700 calibration commands Table B 1 Remote calibration command summary Command Description CALibration Calibration root command PROTected All commands in this subsystem are protected by the calibration lock except queries and CODE CODE up to 8 char string Calibration code or password default KI002700 COUNt Request the number of times the unit has been calibrated INT Tiate Initiate calibration LOCK Lock out calibration opposite of enabling cal with CODE command LOCK Request comprehensive cal lock state 0 locked 1 unlocked SAVE Save cal constant
131. n procedure complete the procedure as quickly as possi ble to minimize card heating that could affect calibration accuracy Example CAL PROT CARD1 STEPO 23 Perform 7700 calibration Remote error reporting Calibration Reference B 21 Methods to detect and determine the nature of calibration errors are discussed in the follow ing paragraphs Error summary Table B 5 summarizes Model 2700 calibration errors Table B 5 Calibration error summary Error number and description 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 438 439 450 10 vdc zero error 100 vdc zero error 10 vdc full scale error 10 vdc full scale error 100 vdc full scale error 100 vdc full scale error 1k 2 w zero error 10k 2 w zero error 100k 2 w zero error 10M 2 w zero error 10M 2 w full scale error 10M 2 w open error 1k 4 w zero error 10k 4 w zero error 100k 4 w zero error 10M 4 w sense lo zero error 1k 4 w full scale error 10k 4 w full scale error 100k 4 w full scale error 1M 4 w full scale error 10M 4 w full scale error 10m ade zero error 100m adc zero error 10m adc full scale error 100m adc full scale error 1 adc full scale error Date of calibration not set Next date of calibration not set 100m vac dac error B 22 Cali
132. nections from the calibrator and Model 7700 must be electrically isolated Ice Bath from each other Performance Verification 1 29 RTD temperature 1 Connect the precision decade resistance box listed in Table 1 1 to the Model 7700 CHI and CH11 H and L terminals using four wire connections See Figure 1 12 for similar connecting scheme 2 Install the Model 7700 in Slot 1 of the Model 2700 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the temperature function by pressing the TEMP key Close Channel 1 by press ing the CLOSE key and keying in 101 4 Configure the Model 2700 temperature function for C units and RTD temperature sen sor 0 0 00385 as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C Press ENTER and note the unit displays the sensor type SENS TCOUPLE Using the cursor and range keys set the display as follows SENS 4W RTD Press ENTER and note the unit displays TYPE PT100 Using the cursor and range keys set the unit for the following display TYPE PT385 f Press ENTER to complete the temperature configuration process 5 Setthe decade resistance box to each of the values shown in Table 1 15 and verify that the temperature readings are within the required limits Open Channel 1 when finished Table 1 15 Pl
133. ng NOTE Ifyou are performing DC only calibration proceed to Programming calibration dates Table 2 10 DC current calibration programming steps Calibration Calibrator step current Calibration command Parameter range 10mA 10 00000mA CAL PROT DC STEP10 10E 3 9E 3 to 11E 3 100mA 100 00000mA CAL PROT DC STEP11 100E 3 90E 3 to 110E 3 1A 1 000000A CAL PROT DC STEP12 1 0 9 to 1 1 Change parameter if using different current AC voltage calibration Follow these steps for AC voltage calibration 1 Connect the calibrator to the Model 2700 INPUT HI and LO terminals as shown Figure 2 4 2 Perform the calibration steps summarized in Table 2 11 For each step Set the calibrator to the indicated voltage and frequency and make sure the unit is in operate You must use the stated voltage and frequency Send the indicated programming command e Wait until the Model 2700 completes each step before continuing Table 2 11 AC voltage calibration programming steps Calibration step Calibrator voltage frequency Calibration 2 17 Calibration command 10mV AC at 1kHz 100mV AC at 1kHz 700 at 1kHz 10 00000mV 1kHz 100 0000mV 1412 100mV AC at 50kHz 100 0000mV 50kHz CAL PROT AC STEP3 1VAC at 1kHz 1 000000V 1kHz CAL PROT AC STEP4 1VAC at 50kHz 1 000000V 50kHz CAL PROT AC STEP5 10VAC at 1kHz 10 00000V 1kHz CAL PROT AC STEP6 10VAC at 50kHz 10 00000V 50kHz CAL
134. nnected 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 the board should be returned to the factory for proper cleaning servicing Rev 10 99 Table of Contents 1 Performance Verification
135. nstruments LabVIEW Drivers TestPoint Drivers ACCESSORIES SUPPLIED M odel 1751 Safety Test Leads User Manual Service Manual A 8 Specifications 7700 20 Channel Differential Multiplexer w Automatic CJC GENERAL Card Input 20 CHANNELS 20 channels of 2 pole relay input All channels config 0 urableto 4 pole 2 CHANNELS 2 channels of current only input RELAY TYPE Latching electromechanical funcion ACTUATION TIME 3ms Cel Lo Channels 2 9 CAPABILITIES CHANNELS 1 20 Multiplexone of 20 2 pole or one of 10 4 pole signals i into DMM E o 2 Pole Open Closed CHANNELS 21 22 Multiplex one of 2 2 pole current signals into DMM Cold Junction ooro lo ooo Channel 11 INPUTS Channels 12 19 i MAXIMUM SIGNAL LEVEL i Channels 1 20 300V DC or rms 1A switched 60W 125VA maxi mum Channels 21 22 60V DC or 30V rms 3A switched 60W 125VA maximum CONTACT LIFE typ gt 105 operations at max signal level gt 108 operations cold switching CONTACT RESISTANCE lt 10 at end of contact life CONTACT POTENTIAL lt 500nV typical per contact 1uV max lt 500 typical per contact pair 14V max OFFSET CURRENT lt 100 CONNECTOR TYPE Screw terminal 20 AWG wire size ISOLATION BETWEEN ANY TWO TERMINALS gt 102 Q lt LOOpF ISOLAT
136. nts require 1kHz only All calibrator specifications are 90 day 23 C 5 C specifications and indicate total absolute uncertainty at specified output 2 6 Calibration Aborting calibration You can abort the front panel calibration process at any time by pressing EXIT The instru ment will then ask you to confirm your decision to abort with the following message ABORT CAL Press EXIT to abort calibration at this point or press any other key to return to the calibra tion process NOTE The Model 2700 will not respond to any remote programming commands while the ABORT CAL message is displayed Front panel calibration Follow the steps in the following paragraphs in the order shown for comprehensive DC only and AC only calibration procedures The procedures for front panel calibration include Preparing the Model 2700 for calibration Front panel short and open calibration DC voltage calibration Resistance calibration DC current calibration e AC voltage calibration AC current calibration Setting calibration dates Preparing the Model 2700 for calibration 1 Turn on the Model 2700 and allow it to warm up for at least two hours before perform ing a calibration procedure 2 Start the calibration process as follows a Access the calibration menu by pressing SHIFT then TEST then display TEST CALIB using the up or down range key Press ENTER b Usethe up or down range key to scroll through the
137. o do so Make sure that all plug in module connections are de energized and dis connected before replacing module amps fuses Replacing Model 7700 amps fuses 1 Turn off the power and disconnect the power line and external connections from the Model 7700 Open the Model 7700 top cover 3 Locate the amps fuses for CH21 and CH22 see Figure 3 3 Remove the circuit board from the bottom plastic housing by removing the two bottom screws Figure 3 3 Model 7700 amps fuses Model 7700 CH3 CH4 5 CH6 7 8 9 10 HLHLHLHL D INPUT CL E SENSE OHMS 4 WIRE CH22 Fuse CH21 Fuse 3 6 Routine Maintenance 3 6 De solder the blown CH21 or CH22 fuse as required taking care not to damage the cir cuit board or spread solder flux around the board Install a new 3A 250V fast blow fuse Keithley part number FU 107 1 CAUTION Do not use a fuse with a higher current rating than specified or module damage may occur Solder the new fuse in place using organic OA based flux solder again taking care not to damage the circuit board or spread solder flux around the board Carefully clean the repaired area of the circuit board with a foam tipped swab or brush dipped in pure water then blow dry the board with dry nitrog
138. odel 2700 verifying Model 7700 DC voltage Verifying Model 2700 verifying Model 7700 DCA signal multiplexing and gain DCA signal switching DCV signal multiplexing and gain DCV signal switching 4 13 derating factors additional Digital circuitry block diagram DC calibration commands Digital circuitry checks Digital 8 Disassembly Disassembly procedures Display board 4 6 Display board checks Environmental conditions Error queue Error summary Extender board connections factory defaults restoring Factory service frequency Verifying Model 2700 verifying Model 7700 Front panel disassembly tests Front panel Model 7700 calibration 2 22 Front terminal AMPS fuse 3 4 fuse front terminal replacing Power line fuses Model 7700 replacing Model 7702 replacing plug in module replacing Generating an SRQ on calibration complete Generating an SRQ on error B 23 Handling and cleaning 5 2 Handling PC boards 488 interface 4 8 INPUT 11114 9 Input terminal wire colors Instrument reassembly 5 7 Introduction Calibration Calibration Program Calibration Mur Disassembly Performance Verification Replaceable Parts Routine Maintenance troubleshooting Key matrix KEY test limits ACI Model 2700 DCI Model 2700 Plug in module ACI Model 7700 Plug in module DCI Model 7700 plug in module resistance verification Model 7700 resistance verifi
139. ogramming steps Table 2 12 AC current calibration programming steps Table 2 13 Recommended equipment for manufacturing calibration Table 2 14 Recommended equipment for Model 7700 calibration 3 Routine Maintenance Table 3 1 Power line hse Jerem eei e e aate 33 4 Table 4 1 Table 4 2 Table 4 3 Table 4 4 Table 4 5 Table 4 6 Table 4 7 Table 4 8 Table 4 9 Table 4 10 Table 4 11 Table 4 12 Table 4 13 Table 4 14 Table 4 15 Table 4 16 Table 4 17 5 Table 5 1 Table 5 2 6 Table 6 1 Table 6 2 Table 6 3 Table 6 4 Table 6 5 Table 6 6 Table 6 7 Table 6 8 B Table B 1 Table B 2 Table B 3 Table B 4 Table B 5 Troubleshooting Power supply components Display board checks Power supply checks Digital circuitry checks DCV signal switching ACV and FREQ signal switching eee 2 Q2 signal switching Q4 signal switching 22 024 reference switching 2 DCA signal switching ACA signal switching DCV signal multiplexing and gain 22 2 ACV and ACA signal multiplexing and gain DCA signal multiplexing and gain Q2 signal multiplexing and gain esses Q4 signal multiplexing and gain 5 Switching device locations
140. oller U401 is the display board microcontroller that controls the display and interprets key data The microcontroller uses three internal peripheral I O ports for the various control and read functions Display data is serially transmitted to the microcontroller from the digital section via the TXB line to the microcontroller RDI terminal In a similar manner key data is serially sent back to the digital section through the RXB line via TDO The 4MHz clock for the microcon troller is generated by crystal Y401 Troubleshooting 4 7 Display DS401 is the display module which can display up to 12 alpha numeric characters and includes the various annunciators The display uses a common multiplexing scheme with each character refreshed in sequence U402 and U403 are the drivers for the display characters and annunciators Note that data for the drivers serially transmitted from the microcontroller MOSI and PC1 Filament voltage for the display is derived from the power supply transformer F1 and F2 The display drivers require 37VDC and 5VDC which are supplied by U144 5VD and U101 37V Key matrix The front panel keys S401 S430 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 th
141. onversions FAST is DETector BAN Dwidth 300 with nPLC 1 0 3 Applies to 0 18 C and 28 50 C 4 For square wave inputs gt 10 of ACV range except 100mV range 100mV range frequency must be gt 10 2 if input is lt 20mvV 5 Applies to non sine waves gt 5Hz 6 For 1kQ unbalance in LO lead 7 Speeds for 60Hz 50Hz operation using factory defaults operating conditions RST Autorange off Display off Limits off Trigger delay 0 Includes measurement and binary data transfer out GPIB 8 0 01 of step settling error Trigger delay 400ms 9 Trigger delay 0 10 Sample count 1024 11 DETector BANDwidth 300 with nPLC 0 01 12 Maximum useful limit with trigger delay 175ms Internal Scanner Speeds Into and Out of Memory to GPIB 7703 Scanning DCV 185 s 7703 Scanning DCV with Limits or Time Stamp On 150 5 7703 Scanning 23 155 s 7703 Scanning DCV alternating 2W 60 s 7702 Scanning DCV 60 s 7700 Scanning Temperature T C 55 s Internal Scanner Speed Notes 1 Speeds are 60Hz or 50Hz operation using factory default conditions RST NPLC 0 01 Auto Zero off Auto Range off and Display off Sample count 1024 Includes measurement and binary data transfer out GPIB 2 Detector Bandwidth 300 3 For Auto Delay On 1 8 s Specifications A 7 GENERAL SPECIFICATI ONS POWER SUPPLY 100V 120V 220V 240V 10 LINE FREQUENCY 45Hz to 66Hz and 360Hz to 440Hz automatically sensed at powe
142. otes 2096 overrange except on 1000V and 3A Add the following to ppm of range uncertainty 100mV 15ppm 1V and 100V 2ppm 1000 30ppm 1M 2ppm 10mA and 1 10ppm 100mA 40ppm 2 measured with 10M Q input resistance DMM gt 10GQ DMM on 10M 0 and 100M 0 ranges Relativeto calibration accuracy For signal levels 2500V add 0 02ppm V uncertainty for portion exceeding 500V Specifications are for 4 wire Q 1000 with offset compensation on With offset compensation on OPEN CKT VOLTAGE is 12 8V For 2 wire Q add 10 addi tional uncertainty Must have 10 matching of lead resistance in Input HI and LO Add the following to ppm of reading uncertainty when using plug in modules 10M Q 220ppm 100MQ 2200ppm For Model 7703 add the following 10kQ 10ppm 100kO 100ppm 1M 0 1000ppm 10M O 196 100M O 10 for 4096 operating environment Add 1V when used with plug in modules 10 For RATIO DCV only For AVERAGE DCV and Thermocouples only Available with plug in modules only 11 Add 6pV to of range uncertainty when using Model 7703 12 Auto zero off 13 For LSYNC On line frequency 30 1 96 For LSYNC Off use 6008 for gt 1PLC 14 For 1kQ unbalance in LO lead AC CMRR is 70dB 15 Speeds are for 60Hz 50Hz operation using factory defaults operating conditions RST Autorange off Display off Limits off Trigger delay 0 16 Speeds include measurements and binary data transfer out the GPIB 17 Sample
143. ple temperature verification reading limits Table 1 8 Four wire RTD temperature verification reading limits Table 1 9 Plug in module reading limits Table 1 10 Plug in module ACV reading limits Table 1 11 Plug in module DCI limits Table 1 12 Plug in module ACI limits eene Table 1 13 Limits for plug in module resistance verification Table 1 14 Model 7700 thermocouple temperature verification redding limits eterne es 128 Table 1 15 Plug in module four wire RTD temperature verification reading limits 1 1 29 2 Calibration Table 2 1 Recommended equipment for comprehensive calibration Table 2 2 Comprehensive calibration procedures Table 2 3 DC volts calibration summary eere Table 2 4 Ohms calibration summary Table 2 5 DC current calibration summary eee Table 2 6 AC voltage calibration summary eene Table 2 7 AC current calibration summary 2 22 2 4 42 Table 2 8 DC voltage calibration programming steps Table 2 9 Resistance calibration programming steps Table 2 10 DC current calibration programming steps Table 2 11 AC voltage calibration pr
144. pts on the screen to perform calibration Program C 1 Model 2700 calibration program 1 Model 2700 calibration program Rev 1 0 7 30 99 OPEN IEEE FOR OUTPUT AS 1 Open IEEE 488 output path OPEN IEEE FOR INPUT AS 2 Open IEEE 488 input path PRINT 1 INTERM CRLF Set input terminator PRINT 1 OUTTERM LF Set output terminator PRINT 1 REMOTE 4 16 Put 2700 5700A in remote PRINT 1 CLEAR Send DCL PRINT 1 OUTPUT 16 SYST PRES CLS Initialize 2700 PRINT 1 OUTPUT 16 ESE 1 SRE 32 Enable OPC and SRQ PRINT 1 OUTPUT 4 RST CLS STBY Reset 5700A calibrator PRINT 1 OUTPUT 4 CUR POST NORMAL Normal current output C CAL PROT 2700 partial command header CLS Clear CRT PRINT Model 2700 Multimeter Comprehensive Calibration Program PRINT 1 OUTPUT 16 CAL PROT CODE KI002700 Send KI002700 cal code PRINT 1 OUTPUT 16 CAL PROT INIT Initiate calibration GOSUB ErrCheck RESTORE CmdList FOR I 1 TO 25 READ Msg Cmd Loop for all cal points Read message cal strings C4 Calibration Program SELECT CASE I Select cal sequence CASE 1 2 PRINT Msg GOSUB KeyCheck CASE 3 PRINT Connect calibrator to INPUT and SENSE jacks PRINT Wait 3 minutes GOSUB KeyCheck PRINT 1 OUTPUT 4 EXTSENSE OFF PRINT 1 OUTPUT 4 Msg PRINT 1 OUTPUT 4 OPER CASE 4 5 11 12 14 TO 22 24 25 PRINT 1 OUTPUT 4 Msg PRI
145. quipment The following calibration equipment is required Fluke 5700A Calibrator e Keithley Model 8610 Calibration Short Double banana plug to BNC cables See Section 2 for detailed equipment information and refer to these figures for connections e Low thermal short connections Figure 2 1 DC volts and ohms connections Figure 2 2 DC amps and AC amps connections Figure 2 3 e AC volts connections Figure 2 4 General program instructions Calibration Program C 3 1 With the power off connect the Model 2700 and the calibrator to the IEEE 488 inter face of the computer Be sure to use shielded IEEE 488 cables for bus connections 2 Turn the computer the Model 2700 and the calibrator Allow the Model 2700 and the calibrator to warm up for at least one hour before performing calibration 3 Make sure the Model 2700 is set for a primary address of 16 Use the front panel GPIB key to check or change the address Make sure the calibrator primary address is at its factory default setting of 4 5 Make sure that the computer bus driver software is properly initialized Enter the QBasic editor and type in the program below Check thoroughly for errors then save it using a convenient filename NOTE The program assumes a default calibration code of KI002700 If the calibration code has been changed modify the CAL PROT CODE parameter accordingly 7 Run the program and follow the prom
146. quipment 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 IN symbol on an instrument indicates that the user should refer to the operating instructions located in 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 indicated 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 co
147. r up POWER CONSUMPTION 28VA OPERATING ENVIRONMENT Specified for 0 C to 50 C Specified to 80 RH at 35 C STORAGE ENVIRONMENT 40 C to 70 C BATTERY Lithium battery backed memory 3 years 23 C WARRANTY 3 years EMC Conforms to European Union Directive 89 336 EEC EN61326 1 SAFETY Conforms to European Union Directive 73 23 EEC EN61010 1 VIBRATION MIL PRF 28800F Class 3 Random WARM UP 2 hours to rated accuracy DIMENSIONS Rack Mounting 89mm high x 213mm wide x 370mm deep 3 5 in x 8 375 in x 14 563 in Bench Configuration with handle and feet 104mm high x 238mm wide x 370mm deep 4 125 in x 9 375 in x 14 563 in SHIPPING WEIGHT 6 5kg 14 Ibs DIGITAL 1 0 2 inputs 1for triggering and 1 for hardware interlock 5 outputs 4 for Reading Limits and 1 for Master Limit Outputs areTTL com patible or can sink 250mA diode clamped to 33V TRIGGERING AND MEMORY Window Filter Sensitivity 0 01 0 1 1 10 or Full scale of range none Reading Hold Sensitivity 0 01 0 1 96 1 or 10 of reading Trigger Delay Oto 99 hrs 1ms step size External Trigger Delay lt 2ms External Trigger Jitter Ims Memory Size 55 000 readings MATH FUNCTIONS Rel Average Std Dev Peak to Peak of stored reading Limit Test and mX b with user defined units dis played REMOTE INTERFACE Keithley XLinx Up amp Running starter software GPIB IEEE 488 2 and RS 232C SCPI Standard Commands for Programmable I
148. re 1 6 Connections for Model 2700 resistance verification 100MX range Model 2700 Sense HI Integra Series e e Output 240 Cerea LO Table 1 6 Sense LO Limits for resistance verification Calibrator Output 2 wire Resistance S OOO C OD Coco C Cc Q 2 Note Use shielded cables to minimize noise Disable calibrator external sense mode Q Range 1000 1kQ 10kQ 100kQ IMQ 10MQ 100MQ Nominal resistance 100Q 1kQ 10kQ 100kQ IMQ 10MQ 100MQ Nominal reading limits 1 year 18 C to 28 C 99 9884 to 100 0116 0 999894 to 1 000106kQ 9 99894 to 10 00106kQ 99 9890 to 100 0110kQ 0 999890 to 1 0001 10MQ 9 99590 to 10 00410MQ 99 7970 to 100 2030MQ Recalculated limits to to to to to to to Q kQ Enable 0 COMP offset compensated ohms when testing 1000 range Calculate limits based on actual calibration resistance values and Model 2700 one year resistance accuracy specifications See Verification limits Performance Verification 1 15 Verifying temperature Thermocouple thermistor and RTD temperature readings are derived from DC
149. reported by COUNT to 0 Example CAL PROT CARD1 RCO Rest card calibration count B 20 Calibration Reference SAVE CALibration PROTected CARD1 SAVE Purpose To save calibration constants in card EEROM after the calibration procedure Format cal prot cardl save Parameter None Description The SAVE command stores calculated calibration constants derived dur ing Model 7700 calibration in card EEROM EEROM is non volatile mem ory Calibration constants will be retained indefinitely once saved Generally SAVE is sent after all other calibration steps except for LOCK NOTE Card calibration will be only temporary unless the SAVE command is sent to per manently store calibration constants Example CAL PROT CARD1 SAVE Save card calibration constants STEPO CALibration PROTected CARD1 STEPO Purpose To perform Model 7700 calibration Format cal prot cardl stepO temp Parameter temp Cold calibration temperature C Description STEPO performs temperature sensor calibration of the Model 7700 The card must be allowed to cool down to ambient temperature before calibra tion and the cold temperature of the card must be measured and sent as the temp parameter during calibration NOTE Before calibrating the Model 7700 make sure that power has been removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibratio
150. resistance esee Verifying temperature Verifying frequeBicy iie rti Verifying ratio and average Calibration hice Environmental conditions eee Warm Up period Line POWER s Calibration considerations 2 Calibration code eene meret Front panel calibration code Remote calibration code eee Comprehensive calibration Calibration cycle Recommended equipment Aborting calibration 2 Front panel calibration sse Remote calibration Manufacturing calibration Recommended test equipment Extender board preparation esee Unlocking manufacturing calibration Measuring function generator signal amplitude Front panel manufacturing calibration Remote manufacturing calibration Model 7700 calibration eee Recommended test
151. riod Allow the Model 2700 to warm up for at least two hours 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 Also allow the test equipment to warm up for the minimum time specified by the manufacturer Line power The Model 2700 requires a line voltage of 100V 120V 220V 240V 10 and a line frequency of 45Hz to 66Hz Note that the line frequency is automatically sensed at power up but the line voltage must be manually set to either 100V 120V or 220V 240V as described in Section 3 1 4 Performance Verification Recommended test equipment Table 1 1 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 calibrator uncertainty will add to the uncertainty of each measurement Recommended verification equipment Fluke 5700A Calibrator AC Voltage 50kHz 700V 375ppm DC Current 500 AC Current 1kHz 3A 457ppm AC voltage AC current DC voltage 1kHz 50kHz DC current 1kHZ Resistance 100mV 14ppm 100mV 200ppm 10mA 60ppm 1A 690ppm 1000 17
152. s to EEROM DATE year month day Send cal date to 2700 DATE Request cal date from 2700 NDUE year month day Send next due cal date to 2700 NDUE Request next due cal date from 2700 DC DC cal steps STEPO Rear scanner terminals short step STEPI Front terminal short circuit STEP2 Open circuit 5 lt NRf gt 10V DC step STEPA lt NRf gt 10V DC step 5 5 lt NRf gt 100V DC step STEP6 lt NRf gt 1kQ 4 wire step 5 7 lt NRf gt 10kQ 4 wire step 5 8 lt NRf gt 100kQ 4 wire step STEP9 lt NRf gt IMQ 4 wire step Table B 1 Continued Remote calibration command summary Calibration Reference B 3 Command Description CALibration PROTected DC 5 10 lt NRf gt 10mA DC step 8 1 lt NRf gt 100mA DC step STEP 12 lt NRf gt 1A DC step AC AC cal steps STEPI 10mV AC at 1kHz step STEP2 100mV AC at 1kHz step STEP3 100mV AC at 50kHz step STEPA 1V AC at 1kHz step STEPS 1V AC at 50kHz step STEP6 10V AC at 1kHz step 5 7 10 AC at 50kHz step STEPS 100V AC at 1KHz step STEPO 100V AC at 50kHz step STEPIO 700 AC at 1kHz step STEP11 100mA AC at 1kHz step 5 12 1A AC at step STEP 13 2A AC at 1kHz step 14 1V AC at 3Hz step STEPI5 1V AC at 1kHz step NOTE Upper case letters indicated short form of each command For example instead of sending
153. ssary voltage level conversion for the RS 232 interface port IEEE 488 interface U158 U160 and U161 make up the IEEE 488 interface U158 a 9914A GPIA takes care of routine bus overhead such as handshaking while U160 and U161 provide the necessary buffering and drive capabilities Trigger circuits Buffering for Trigger Link input and output is performed by U146 Trigger input and output is controlled by the IRQ4 and PB3 lines of the MPU U164 provides additional logic for the trigger input to minimize MPU control overhead Digital I O U146 U191 and U192 make up the digital input circuitry External triggering can occur on J1006 or J1007 U192 allows hardware handshaking to external controllers by gating off triggers U122 U188 and U189 provide digital output U122 is a shift register that feeds updated output information to the two driver ICs U188 and U189 which provide current sink capabil ity of 100mA each Module slot control U127 U173 and U174 make up the control circuitry that allows communication of relay data to Slot 1 or Slot 2 Line sync U179 U180 U181 U182 U183 and U186 are used to control A D triggers synchronized at the zero cross point of the power line voltage U186 controls zero crossing detection while U182 and U183 preserve the trigger states until the zero crossing threshold is detected Analog circuitry Refer to Figure 4 3 for the following discussion on analog circuitry Figure 4 3 Tro
154. switches among reference and zero signals at various phases of the measurement cycle When the input signal is selected by the MUX it is amplified by U132 and U166 Gain is controlled by switches in U129 and associated resistors The multiplexed signals of the measurement cycle are routed to the A D Converter U165 where it converts the analog signals to digital form The digital signals are then routed through an opto isolator to the MPU to calculate a reading Scanner card signals Scanner card input signals are connected directly to installed scanner cards Scanner card output signals are routed internally to the INPUTS switch which selects between the front panel terminals and the scanner card outputs Troubleshooting 4 11 Troubleshooting Troubleshooting information for the various circuits is summarized below See Principles of operation for circuit theory Display board checks If the front panel DISP test indicates that there is a problem on the display board use Table 4 2 Table 4 2 Display board checks Step Item component Required condition Remarks 1 Front panel DISP test Verify that all segments operate Use front panel display test 2 1005 PIN 5 5V 45 Digital 5V supply 3 P1005 PIN 9 37 5 Display 37V supply 4 U401 PIN 1 Goes low briefly on power up then Microcontroller RESET goes high 5 0401 PIN43 4MHz square wave Controller 4MHz clock 6 0401 PIN 32 Pulse train every 1msec
155. t Circuit Designation Description Keithley Part No CR106 DIODE BRIDGE PE05 RF 48 CR110 CR118 DIODE DUAL HSM 2822T31 RF 95 CR111 112 115 117 126 DIODE DUAL SWITCHING BAV99L RF 82 CR114 CR119 DIODE SWITCHING MMBD914 RF 83 CR120 CR122 CR125 DIODE DUAL COMMON ANODE BAWS6LT2 RF 98 DS101 DS102 PILOT LIG HSMH T400 LED PL 92 1 J1002 CONN RT ANGLE MALE MOLEX 0 156 CS 715 4 J1003 HEADER CS 715 5 J1004 CONN RIGHT ANGLE 24 PIN CS 507 J1005 CONN RT ANGLE MALE 9 PIN CS 761 9 J1006 CONN MICRODIN W GND FINGERS CS 792 J1007 CONN D SUB MALE BOARDLOCK TYPE CS 848 9 J1008 LATCHING HEADER FRICTON SGL ROW CS 724 3 J1010 CONN FEMALE 8 PIN CS 612 8 J1012 CONN HEADER STRAIGHT SOLDER PIN CS 368 20 J1014 CONN HEADER STRAIGHT SOLDER PIN CS 368 16 K101 K102 K103 RELAY MINIATURE DPDT TQ2E L2 5V RL 155 L101 L102 L103 L104 FERRITE CHIP 600 OHM BLM32A07 CH 62 L105 L106 L501 L118 FERRITE CHIP 600 OHM BLM32A07 CH 62 L107 L108 CHOKE CH 61 L109 CHOKE EMI CH 57 L110 L111 L112 L113 L114 L116 L117 CHOKE 22UH CH 66 22 LS101 BEEPER 5V 30MA BRT1209P 06 C EM 5 Q101 Q102 N CHANNEL MOSFET TG 387 Q104 109 113 114 120 123 126 135 137 TRANS N CHANNEL JFET SNJ132199 TG 294 Q110 112 115 118 128 130 143 145 TRANS NPN MMBT3904 TG 238 Q111 Q116 0129 0144 0146 TRANS PNP MMBT3906L TG 244 0119 TRANS P CHANNEL JFET J270 TG 166 Q122 Q148 TRANS N CHANNEL JFET SNJ132199 TG 294 Q127 Q131 Q132 Q133 TRANS N MOSFET VN0605T
156. tage 100 0000 mV 0 1 gt 10 GQ 15 30 25435 30 35 1 5 C 1 000000 V 10 pV gt 10 GO 15 6 25 7 3047 1 1 1000000 V 10 gt 10 GO 1044 2045 3045 1 1 100 0000 V 100 pV 10MQ 1 15 6 35 9 45 9 5 1 C 1000000 V5 1 10MQ 1 20 6 3549 5049 5 1 C Resistance 100 0000 Q 100 1 mA 66 V 20 20 80 20 100420 8 1 C 1 000000 kQ 1 1 66 V 20 6 80 6 100 8 1 C 10 00000 10 100 pA 66 V 20 6 80 6 10046 8 1 C 100 0000 kQ 100 mQ 10 pA 128 V 20 6 80 10 100410 8 1 C 1 000000 MQ 10 Q 10 pA 128 V 20 6 80 10 100 10 8 1 C 10 00000MQ27 10 Q 07 10 0 70V 150 6 200 410 400 10 30 1 EE 100 0000MQ27 100 Q 07 10 0 70V 800 30 2000 30 2000 30 150 1 Continuity QW 1 000 100 1 mA 66 V 40 100 100 100 100 100 8 1 C Current 20 00000 mA 10nA lt 02 V 60 15 300 40 500440 50 45 C 100 0000 mA 100 nA 005 V 100 150 300 400 500 400 50 450 C 1 000000 A 10 pA 03V 200 415 500 40 800 440 50 45 C 3 000000 A 10 pA 10V 1000 15 1200 40 1200 40 50 45 C Channel Ratio 10 Ratio Accuracy Accuracy of selected Channel Range Accuracy of Paired Channel Range Channel Average 19 Average Accuracy Accuracy of selected Channel Range Accuracy of Paired Channel Range Temperature Displayed in C F or K Exclusive of probe errors Thermocouples Accuracy based on ITS 90 90 Day 1 Year 23 C 5 C Relativeto UsingCJC Temperature Simulat
157. the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the DC current measurement function by pressing the DCI key Set the Model 2700 for the 20mA range Close Channel 21 by pressing the CLOSE key and keying in 121 5 Source positive and negative full scale currents for each of the ranges listed in Table 1 11 and verify that the readings for each range are within stated limits 6 Press the OPEN key to open Channel 21 Table 1 11 Plug in module DCI limits DCI range Applied DC current Reading limits 1 year 18 C to 28 C 20mA 20 0000mA 19 89960 to 20 01040mA 100mA 100 0000mA 99 9100 to 100 0900mA 1A 1 000000A 0 999160 to 1 000840A 3A 3 000000A 2 99628 to 3 00372A Source positive and negative currents with values shown Tf the Fluke 5725 amplifier is not available apply 2 2A from calibrator Reading limits for 2 2A input are 2 197240 to 2 202760A 1 24 Performance Verification Verifying AC current Check AC current accuracy by applying accurate AC voltage current at specific frequencies from the AC current calibrator to the Model 7700 input terminals and verifying that the dis played readings fall within specified limits Follow these steps to verify AC current 1 Connect the Model 7700 CH21 and L terminals to the calibrator as shown in
158. tion Figure 2 3 Connections for DC and AC amps calibration Figure 2 4 Connections for AC volts calibration Figure 2 5 Function generator connections for manufacturing calibration 3 Routine Maintenance Figure 3 1 Power MOGUle Figure 3 2 Front terminal AMPS fuse 2 21 4242 2 2 Figure 3 3 Model 7700 amps fuses esee Figure 3 4 Model 7702 amps fuses 4 Figure 4 1 Figure 4 2 Figure 4 3 C Figure C 1 Troubleshooting Power supply block diagram eese Digital circuitry block diagram Analog circuitry block diagram Calibration Program Model 2700 calibration program C 3 List of Tables 1 Performance Verification Table 1 1 Recommended verification equipment Table 1 2 DCV reading limits Table 1 3 reading limits en etti eee trii Table 1 4 m Table 1 5 PCL Its ecce etn ePi reete eren ra rit Table 1 6 Limits for resistance verification Table 1 7 Thermocou
159. tion test procedures Verification test summary Verification tests can be performed either through the Model 2700 front panel terminals or through plug in modules This section contains the following procedures Model 2700 verification Use this procedure to test Model 2700 accuracy through the front panel terminals Model 7700 verification Use this procedure to test accuracy through any of the available plug in modules with the same functions as the Model 7700 20 Channel Multiplexer Card Model 2700 tests Model 2700 verification test procedures include DC volts AC volts DC current AC current Resistance Temperature Frequency Model 7700 tests Model 7700 verification test procedures include DC volts AC volts DC current AC current Resistance Temperature Frequency Ratio and average Performance Verification Test considerations When performing the verification procedures WARNING Observe the following safety precautions when performing these tests Be sure to restore factory defaults as outlined above 1 7 Make sure that the equipment is properly warmed up and connected to the correct input terminals Also make sure that the INPUTS switch is in the correct position Do not use autoranging for any verification tests because autorange hysteresis may cause the Model 2700 to be on an incorrect range For each test signal you must manu ally set the correct range for the Model 2700 using the range k
160. tly push in the AMPS jack with your thumb and rotate the fuse carrier one quarter turn counterclockwise See Figure 3 2 Release pressure on the jack and its internal spring will push the fuse carrier out of the socket 3 Remove the fuse and replace it with the same type 3A 250V fast blow Keithley part number FU 99 1 CAUTION Do not use fuse with a higher current rating than specified or instrument damage may occur If the instrument repeatedly blows fuses locate and correct the cause of the trouble before replacing the fuse 4 Install the new fuse by reversing the above procedure Figure 3 2 Model 2700 Front terminal Integra Series AMPS fuse ED A ER Model 2700 Multimeter Data Acquisition System Lo ed MATH OUTPUT RATIO CHAVG CONT OCOMP PERIOD SENSOR 54 66 66 60 f ce BEA MONTO POWER 5 SETUP RANGE TE TES 910 Gersa Q Push AMPS and Rotate Counterclockwise INPUTS RANGE FRONTREAR Routine Maintenance 3 5 Replacing plug in module amps fuses NOTE The following procedures apply only to the Model 7700 and 7702 plug in modules WARNING The information in this section is intended only for qualified service per sonnel Do not perform these procedures unless you are qualified t
161. to calibrate only the DCV DCI and resistance or ACV ACI functions These procedures are usually the only calibration required in the field Manufacturing cali bration is normally done only at the factory but it should also be done in the field if the unit has been repaired See Manufacturing calibration at the end of this section for more information Calibration cycle Perform comprehensive calibration at least once a year or every 90 days to ensure the unit meets the corresponding specifications Recommended equipment Table 2 1 lists the recommended equipment you need for comprehensive DC only and AC only calibration procedures You can use alternate equipment such as a DC transfer stan dard and characterized resistors as long that equipment has specifications at least as good as those listed in the table Table 2 1 Recommended equipment for comprehensive calibration Fluke 5700A Calibrator AC voltage AC current DC voltage 1kHz 50kHz DC current 1kHz Resistance 10V 5ppm 10mV 710ppm 10mA 60ppm 100mA 190ppm 1kQ 12ppm 100V 7ppm 100mV 200ppm 100mA 70ppm 1A 690ppm 10kQ 1 1V 82ppm 1A 110ppm 2 670 100kQ 13ppm 10 82 1MQ 18ppm 100 90 700 85 Miscellaneous equipment Keithley 8610 low thermal shorting plug Double banana plug to double banana plug shielded cable BNC to double banana plug shielded cable 1kHz specifications 10mV and 700V poi
162. truments GmbH Flat 2B WILOCRISSA 14 Rest House Crescent 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 30 30 08 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 9031 10 99 Model 2700 Multimeter Data Aquisition System Service Manual 1999 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Second Printing February 2000 Document Number 2700 902 01 Rev B 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 subsequent updates Addenda which are released between Revisions contain important change information 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 2700
163. ubleshooting 4 9 Analog circuitry block diagram Front Terminals 5101 Scanner Outputs Front Terminals lt lt lt 0 5101 Scanner Outputs Front Terminals 5101 Scanner Outputs Front Terminals 5101 m e Scanner Outputs AMPS Current Shunts K103 R158 R205 R338 DCA AC Switching amp Gain K102 U102 U103 U105 U112 U118 U111 U110 Q108 Q113 U163 U166 i K101 A D i DCV amp Ohms POM INPUT Switching E HI Q101 Q102 Q104 Q105 BUFCOM 0129 0132 1 See Figure 4 2 1 i DCV Divider DCV 100 R117 Q109 Q114 Q136 Ohms Q119 Q123 Q124 0125 Q126 U123 U133 Protection R120 R121 R124 R125 Q107 Q148 VR119 VR120 SENSE HI Protection SENSE R132 R139 R148 LO R163 Q122 Q135 VR119 VR120 Scanner Outputs Slot Scanner Inputs gt Slot 1 Scanner Inputs gt Slot 2 Solid State Protection INPUT HI INPUT HI protection is provided by the SSP Solid State Protection circuit The SSP is pri marily made up of Q101 and Q102 An overload condition opens Q101 and Q102 which dis connects the analog input signal from the rest of the analog circuit Note that for the 100VDC and 1000VDC ranges Q101 and 0102 of the SSP are open The DC voltage signal is routed thro
164. ug in module four wire RTD temperature verification reading limits Applied resistance Reading limits 1 year 18 C to 28 C 22 800 190 06 to 189 94 C 100 000 0 06 0 06 313 590 599 94 to 600 06 Based a 0 00385 See text 1 30 Performance Verification Verifying frequency Follow the steps below to verify the Model 2700 frequency function 1 Connect the function generator to the Model 7700 CH1 and L INPUT terminals See Figure 1 15 2 Install the Model 7700 in Slot 1 of the Model 2700 then turn on the power and allow the unit to warm up for one hour before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Set the function generator to output a IKHz 1V RMS sine wave Select the Model 2700 frequency function by pressing the FREQ key Close Channel 1 by pressing the CLOSE key and keying in 101 5 Verify that the Model 2700 frequency reading is between 0 9999kHz and 1 0001kHz Figure 1 15 Connections for Model 7700 frequency verification CH1 Function Generator
165. ugh the DCV Divider Q114 and Q136 on to the DCV switch ing circuit 4 10 Troubleshooting AMPS input The ACA or DCA input signal is applied to the Current Shunt circuit which is made up of K103 R158 R205 and R338 For the 20mA DC range 5 1Q R205 R338 R158 is shunted across the input Relay K103 is energized set state to select the shunts For all other DCA ranges and all ACA ranges 0 1Q R158 is shunted across the input K103 reset The ACA signal is then sent to the AC Switching amp Gain circuit while the DCA signal is routed directly to the A D MUX amp Gain circuit Signal switching Signal switching for DCV and OHMS is done by the DCV amp Ohms Switching circuit FETs Q113 Q105 Q104 and Q108 connect the DCV or ohms signal to the X1 buffer U113 Note that the reference current for OHMS is generated by the Ohms I Source circuit For 4 wire ohms measurements SENSE LO is connected to U126 Signal switching and gain for ACV FREQ and ACA is done by the AC Switching amp Gain circuit which is primarily made up of K102 U102 U103 U105 U112 U118 U111 and 0110 Note that U111 is used for frequency adjustment The states of these analog switches vary from unit to unit Multiplexer and A D converter All input signals except FREQ are routed to the A D MUX amp Gain circuit The multiplexer U163 switches the various signals for measurement In addition to the input signal the multi plexer also
166. unction bad specify L IEEE failure Q Obvious problem on power up L Batteries and fuses are OK Front panel operational All ranges or functions are bad Q Checked all cables Display or output check one Drifts Q Unable to zero Unstable Overload Q Will not read applied input Q Calibration only Q Certificate of calibration required Q Data required attach any additional sheets as necessary Show a block 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 please describe Be sure to include your name and phone number on this service form KEI I HLEY Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A
167. ure 2 3 Connections for DC and AC amps calibration DC and AC Current Calibrator Model 2700 POWEI 40 Geass Gres O LO Note Be sure calibrator is set for normal current output 2 Calibrate each current step summarized in Table 2 5 For each step e Set the calibrator to the indicated DC current and make sure the unit is in OPERATE Make sure the Model 2700 display indicates the correct calibration current e Press ENTER to complete each step e Allow the Model 2700 to finish each step NOTE Ifyou are performing DC only calibration proceed to Setting calibration dates and saving calibration Table 2 5 DC current calibration summary Calibration step Calibrator current Allowable range 10mA 10 00000mA 9mA to 11mA 100mA 100 0000mA 90mA to 110mA 1A 1 000000A 0 9A to 11 Calibration 2 11 AC voltage calibration Follow these steps for AC voltage calibration 1 Connect the calibrator to the Model 2700 INPUT HI and LO terminals as shown Figure 2 4 Figure 2 4 Connections for AC volts calibration AC Voltage Calibrator Input HI Model 2700 Output HI
168. volts and resistance measurements respectively For that reason it is not necessary to independently ver ify the accuracy of temperature measurements As long as the DC volts and resistance functions meet or exceed specifications temperature function accuracy is automatically verified How ever temperature verification procedures are provided below for those who wish to separately verify temperature accuracy Thermocouple temperature 1 Connect the DC voltage calibrator output terminals to the Model 2700 INPUT jacks using low thermal shielded connections Use 2 wire connections similar to those shown in Figure 1 1 Be sure the INPUTS switch is in the FRONT position 2 Configure the Model 2700 for C units type J temperature sensor and 0 C simulated reference junction as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C If necessary use the cursor and range keys to select C units b Press ENTER The unit displays the sensor type SENS TCOUPLE Make sure that TCOUPLE is displayed then press ENTER The unit then displays the thermocouple type TYPE K d Select a type J temperature sensor then press ENTER The unit then displays the reference junction type JUNC SIM e Make certain that the simulated reference junction type is selected then press ENTER The unit then displays the current simulated reference junction tempera ture SIM 023 f Using the cursor and range keys
169. w to calculate the actual reading limits for a 13dBm measurement with a reference impedance of 500 assume an applied signal 0 998815 V The relationship between voltage and dBm is as follows 2 Vin Rrer dBm 10log imW m From the previous example on calculating DC characteristics accuracy it can be shown that a measurement of 0 998815V on the 1V range has an uncertainty of 36 9644mV or 0 998778V to 0 998852V using one year specifications Expressing 0 998778V as dBm 0 998778V 50Q dBm 101og inW 12 99968dBm and expressing 0 998852V as dBm _ 0 998852 500 dB is 1mW 13 00032dBm Thus the actual reading range is 13dBm 0 00032dBm dBm and dB for other voltage inputs can be calculated in exactly the same manner using pertinent specifications ranges and reference impedances Calculating dB characteristics accuracy The relationship between voltage and dB is as follows Vin dB 20 log As an example of how to calculate the actual readings limits for dB with a user defined VREF of 10V you must calculate the voltage accuracy and apply it to the above equation To calculate a 60dB measurement assume 10mV RMS for a VREF of 10V Using the 100mV range one year 10Hz 20kHz frequency band and SLOW rate the voltage limits are as follows Accuracy 0 06 of reading 0 03 of range 0 0006 x 10mV 0 0003 x 100mV 6 30 ti36uV A 14 Specifications

Keithley Service Manual 2700: englisch

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