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1. KeyCheck Check for key press routine WHILE INKEYS WEND Flush keyboard buffer PRINT PRINT Press any key to continue ESC to abort program DO IS INKEYS LOOP WHILE I IF IS CHR 27 THEN GOTO EndProg Abort if ESC is pressed RETURN CalEnd Check for cal step completion PRINT Performing calibration step I DO PRINT 41 SRQ Request SRQ status INPUT 42 s Input SEO status byte LOOP UNTIL s Wait for operation complete PRINT 1 OUTPUT 16 ESR Clear OPC PRINT 1 ENTER 16 INPUT 42 s PRINT 41 SPOLL 16 Clear SEO INPUT 42 s RETURN ErrCheck Error check routine PRINT 1 OUTPUT 16 SYST ERR Query error queue PRINT 1 ENTER 16 INPUT 2 E Err IF E lt gt 0 THEN PRINT Err GOTO ErrCheck Display error RETURN Settle Calibrator settling routine DO PRINT 1 OUTPUT 4 ISR Query status register PRINT 1 ENTER 4 INPUT 42 s LOOP UNTIL s AND amp H1000 Test settle bit RETURN EndProg Close files 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 DATA Disconnect low thermal short from inputs DC STEP2 DATA OUT 10 0 HZ DC STEP3 10 DATA OUT 10
2. 2 Calibration usce 2 Environmental conditions Warm up period pen cas EAT em Calibration considerations 2 Calibration Code ien Front panel calibration code Remote calibration code Comprehensive calibration rdo Calibration cycle uei n E Recommended equipment Aborting calibration ai a eret terere ee eene ee nnno Front panel calibration 2 Preparing the Model 2015 for calibration Front panel short and open calibration IDC Volts calibration arara raga 3 Routine Maintenance 4 Troubleshooting Resistance calibration DC current calibration rra AC voltage calibration uuu usnu AC current cabbrati n teneo nete Distortion calibration rrak Function generator calibration 2 Setting calibration dates and saving calibration Remote calibration reete Gi Preparing the Model 2015 for calibration Short and open calibration IDC volts Calibration arara rata Resistance calibration IDC current calibration rroa AC voltage calibration 2 AC current calibration i idee heit te bres Distorti
3. Table 4 14 DCA signal multiplexing and gain Signal U129 0129 0129 Gain Range 0 163 pinl 8 9 JU USO 10mA S6 OFF OFF ON x100 100mA 86 OFF OFF ON x100 1A S6 OFF OFF ON x100 3A S6 OFF ON OFF x10 Table 4 15 Q2 signal multiplexing and gain Signal 0129 0129 0129 Gain Range 0 163 pinl 8 9 JU USO 1009 S4 OFF OFF ON x100 1kQ S4 OFF ON OFF x10 10kQ S4 OFF ON OFF x10 100 84 ON OFF x10 IMQ S4 ON OFF OFF 1 10 0 54 ON OFF OFF 1 100MQ 54 ON OFF OFF 1 Table 4 16 24 signal multiplexing and gain Signal U129 0129 0129 Gain Range 0 163 1 8 9 0166 1000 54 then 57 OFF OFF ON x100 1kQ 54 then 57 ORE ON OFF x10 10kQ S4 then 57 OFF ON OFF x10 100 84 then S7 OEE ON OFF x10 IMQ S4 then 57 OFF OFF 1 10 0 54 then 57 ON OFF OFF 1 100MQ 54 then S7 ON OFF OFF x1 Troubleshooting 4 25 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 0102 SSP Solid State Protection Q114 Q136 0109 DCV Divider K101 Q113 Q105 Q104 Q108 DCV and Ohms Switching Q121 Sense LO K102 U103 U105 U111 AC switching and Gain U133 Q120 Q123 Q124 Q125 Q126 Ohms I Source K103 Current Shunts U129 U163 A D Mux and G
4. 5 28 50 C VOLTAGE 100 0000 mV 0 1 pV gt 10GQ 30 30 40 35 50 35 2 6 1 000000 V TORV gt 10 GQ 15 6 25 7 30 7 2 1 10 00000 10 gt 10 GQ 15 4 20 5 30 5 2 1 100 0000 V 100 10 MQ 1 15 6 30 6 4546 541 1000 000 V 1 mV 10 MQ 1 20 6 35 6 45 6 541 RESISTANCE 5 100 0000 00 uQ 1 30 30 80 40 100 40 8 6 1 000000 1mQ 1 20 6 80 10 100 10 8 1 10 00000 10mQ 100 pA 20 6 80 10 100 10 8 1 100 0000 100 mQ 10 20 6 80 10 100 10 8 1 1 000000 1 Q 10 pA 20 6 80 10 100 10 8 1 10 00000 10 Q 700 nA 10 0 150 6 200 10 400 10 2541 100 0000 MQ 00 Q 700 nA 10MOQ 800 30 1500 30 1500 30 1504 1 CURRENT 10 00000 mA 10 nA lt 0 15V 60 15 300 40 500 40 50 5 100 0000 mA 100 nA lt 0 03V 100 150 300 400 500 400 50 50 1 000000 A 1 uA 03V 200 15 500 40 800 40 50 5 3 00000 A 10 pA ail y 1000 10 1200 15 1200 15 50 5 CONTINUITY 2W 1kQ 00 mQ 1 40 100 100 100 120 100 8 1 DIODE TEST 3 00000 V 10 uV 1mA 2046 30 7 40 7 841 10 00000 V 10 uV 100 pA 20 6 30 7 40 7 8 1 10 00000 V 10 uV 10 uA 20 6 30 7 40 7 8 1 Specifications 5 DC OPERATING CHARACTERISTICS FUNCTION DIGITS READINGS s PLCs DCY all ranges 6153 4 5 10 DCI all ranges and 61597 30 1 2W Ohms lt 10M range 6135 50 1 5025 5 270 0 1 5155 500 0 1 5155 1000 0 04 4155 2000 0 01 DC SYSTEM SPEEDS 26 RANGE CHANGE 50 s FUNCTION CHANGE 45 s AUTORANGE 310
5. Environmental conditions Conduct the calibration procedures in a location that has An ambient temperature of 18 to 28 C 65 to 82 F relative humidity of less than 80 unless otherwise noted Warm up period Allow the Model 2015 Multimeter to warm up for at least one hour before performing calibration If the instrument has been subjected to temperature extremes those outside the ranges stated in the above section allow extra time for the instrument s internal temperature to stabilize Typ ically allow one extra hour to stabilize a unit that is 10 C 18 F outside the specified tempera ture range Also allow the test equipment to warm up for the minimum time specified by the manufacturer Line power The Model 2015 Multimeter requires a line voltage of 100V 120V 220V 240V 10 and a line frequency of 45Hz to 66Hz or 360Hz to 440Hz 2 4 Calibration 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 input jacks are selected with the INPUTS switch Make sure the calibrator is in operate before you complete each calibration step Always let the source signal settle before calibrating each point Do not connect test equipment to the Model 2015 through a scanner or other switching equipment If an error occurs during calibration the Model
6. 0163 0166 See Figure 4 2 Q113 U115 U129 U132 I Ohms I Source Divider U133 Q123 R117 Q109 0125 0124 0114 0136 0126 0119 0120 0123 5 Output lt SEN SE HI SEN SE Scanner Scanner Scanner Control LO Inputs Option Solid State Protection INPUTHI 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 Q102 of the SSP are open The DC voltage signal is routed through the DCV Divider Q114 and Q136 on to the DCV switch ing circuit 4 12 Troubleshooting AMPS input The ACA or DCA input signal is applied to the Current Shunt circuit which is made up of K103 R158 and R205 For the 10mA DC range 10 1Q R158 R205 is shunted across the input Relay K103 is energized on to select the shunts For all other DCA ranges and all ACA ranges 0 1Q R158 is shunted across the input K103 off 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
7. B 14 Calibration Reference AC calibration commands The AC commands perform comprehensive user calibration of the ACV and ACI functions Table B 3 summarizes these calibration commands Table B 3 AC calibration commands Command Description CALibration PROTected AL STEP 1 10mV AC at 1kHz calibration step STEP2 100mV AC at 1kHz calibration step STEP3 100mV AC at 50kHz calibration step STEPA 1V AC at 1kHz calibration step STEPS 1V AC at 50kHz calibration step STEP6 10V AC at 1kHz calibration step 8 10V at 50kHz calibration step STEP8 100V AC at 1kHz calibration step STEPO 100V AC at 50kHz calibration step STEPIO 700 AC at 1kHz calibration step 8 1 100mA AC at 1kHz calibration step STEP 12 1A AC at 1kHz calibration step STEP 13 2A AC at 1kHz calibration step Calibration Reference B 15 5 lt gt CALibration PRO Tected AC STEP lt n gt Purpose To program individual AC calibration steps Format cal prot ac step lt n gt Parameters 10mV AC at 1kHz calibration step 100mV at IKHZ 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 100V AC at 50khz calibration step 700V AC at 1kHz calibration step 100mA AC at 1kHz calibration step 1A AC at 1KHz calibration s
8. AC current calibration Distortion calibration Function generator calibration Programming calibration dates Saving calibration constants Locking out calibration NOTE As with front panel calibration you can choose to perform comprehensive DC only AC only distortion or function generator calibration Be sure to include a space character between each command and parameter Calibration 2 17 Preparing the Model 2015 for calibration 1 Connect the Model 2015 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 2015 and allow it to warm up for an hour before performing calibration Select DCV function and choose SLOW as the rate integration time 10PLC Make sure the primary address of the Model 2015 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 KI002015 The above command shows the default code KI002015 Substitute the correct code if changed Send the following command to initiate 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 M
9. FU 71 200 240V 1 4A 250V 5 x 20 mm slow blow FU 96 4 Replacing the AMPS fuse The AMPS fuse protects the current input from an over current condition Follow the steps below to replace the AMPS fuse WARNING Makesurethe instrument is disconnected from the power line and other equipment before replacing the AMPS fuse 1 Turn off the power and disconnect the power line and test leads 2 Fromthe front panel gently push in the AMPS jack with your thumb and rotate the fuse carrier one quarter turn counterclockwise 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 3 4 Routine Maintenance CAUTION Donotusea fuse with a higher current rating than specified or instrument damage may occur If the instrument repeatedly blows fuses locate and cor rect the cause of the trouble before replacing the fuse 4 Install the new fuse by reversing the above procedure 4 Troublesnooting 4 2 Troubleshooting Introduction This section of the manual will assist you in troubleshooting and repairing the Model 2015 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 WARNING _ Theinformatio
10. REV 01 A02 indicates a main firmware revision level of A01 and a front panel firmware revision level of A02 The firmware for the main CPU is located in the EPROMs U156 EVEN and U157 ODD leadless ICs that resides in chip carriers on the PC board To replace the CPU firmware do the following WARNING Disconnect the instrument from the power lines and remove the test leads before changing the firmware 1 Remove the case cover as described earlier in this section 2 Locate U156 EVEN and U157 ODD EPROMs on the DMM 106 board They are the only devices installed in chip carriers sockets CAUTION EPROMSU 156 and U 157 are static sensitive devices Be sure to follow the handling precautions explained in Static sensitive devices 3 Using an appropriate chip extractor remove U156 from its chip carrier 4 Position the new U156 EPROM on the appropriate chip carrier Make sure the notched corner of the chip is aligned with the notch in the chip carrier NOTE Be sure to install the correct EPROMs at the ODD and EVEN locations The instru ment will not function if the EPROMs are installed in the wrong sockets 5 With the EPROM properly positioned push down on the chip until it completely seats into the chip carrier 6 Repeat steps 3 through 5 for EPROM U157 7 After installation make sure the instrument powers up normally before replacing the cover 5 12 Disassembly 6 Replaceable Parts 6 2 Replaceable Part
11. Table 1 3 ACV reading limits ACV Applied AC 1kHz reading limits 50kH z reading limits range voltage 1 year 18 C 28 C 1 year 18 C 28 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 700 000V 699 36 to 700 64V 698 79 to 701 21V Tf the 5725A amplifier is not available change the 700V 50kHz step to 220V 50kHz Reading limits for 220V 50kHz 219 36 to 220 64V 1 12 Performance Verification Verifying DC current Check DC current accuracy by applying accurate DC currents from the DC current calibrator to the AMPS input of the Model 2015 and verifying that the displayed readings fall within spec ified limits Follow these steps to verify DC current accuracy 1 Connect the Model 2015 AMPS and INPUT LO jacks to the calibrator as shown in Figure 1 3 Figure 1 3 Connections for DC current verification Model 2015 f KEITHLEY DC Current Calibrator N ote Be sure calibrator is set for normal current output 2 Select the DC current measurement function by pressing the DCI key then choose the SLOW integration rate with the R
12. The Model 2015 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 KI002015 2 6 Calibration Comprehensive calibration The comprehensive calibration procedure calibrates the DCV DCI ACV ACI ohms and generator functions You can also choose to calibrate only the DCV DCI and resistance ACV distortion or generator functions These procedures are usually the only ones required in the field Manufacturing calibration 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 AC only distortion and generator calibration procedures You can use alternate equipment such as a DC trans
13. 001 C 0 5 C Temperature Notes 1 For temperatures lt 100 C add 0 1 C and gt 900 C add 0 3 2 Temperature can be displayed in C K or E 3 Accuracy based on ITS 90 4 Exclusive of thermocouple error GENERAL SPECIFICATIONS POWER SUPPLY 100 120V 220V 240V 10 LINE FREQUENCY 45Hz to 66Hz automatically sensed at power up POWER CONSUMPTION 25 VA OPERATING ENVIRONMENT Specified for 0 C to 50 C Specified to 80 R H at 35 C STORAGE ENVIRONMENT 40 C to 70 C WARRANTY 3 years SAFETY Conforms with European Union Directive 73 23 EEC EN 610110 1 UL3111 1 EMC Conforms with European Union Directive 89 336 EEC EN 55011 EN 50082 1 EN 61000 3 2 EN 61000 3 3 FCC part 15 class B WARMUP 1 hour to rated accuracy DIMENSIONS Rack Mounting 89mm high x 213mm wide x 370mm deep 3 in x 8 in x 14 in Bench Configuration with handle and feet 104mm high x 238mm wide x 370mm deep 4 in x 9 in x 1446 in NET WEIGHT 4 2kg 8 8 Ibs SHIPPING WEIGHT 5kg 11 Ibs VOLT HERTZ PRODUCT lt 8 x 107V Hz ACCESSORIES SUPPLIED Model 1751 Safety Test Leads User Manual Service Manual Specifications A 9 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 Accuracy ppm of reading ppm of range ppm parts per million
14. 2015 will generate an appropriate error message See Appendix B for more information WARNING common mode voltage voltage between INPUT LO and chassis ground is 500 V peak E xceeding this value may cause a break down in insulation creating a shock hazard Some of the procedures in this section may expose you to dangerous voltages U se standard safety precau tions when such dangerous voltages are encountered to avoid personal injury caused by electric shock CAUTION not exceed 1100V peak between IN PUT HI and INPUT LO or 350V peak between SENSE HI and SENSE LO Exceeding these values may result in instrument damage Calibration 2 5 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 Access the calibration menu by pressing SHIFT CAL and note that the instrument dis plays the following CAL DATES Use the up or down range key to scroll through the available calibration parameters until the unit displays RUN then press ENTER The Model 2015 then prompts you to enter a code CODE 000000 The factory default code is 002015 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
15. 274 R502 RES 4 75K 1 1OOMW THICK FILM R 418 4 75K R503 506 RES 22 1K 1 1OOMW THICK FILM R 418 22 1K R516 RES 200 1 100MW THICK FILM R 418 200 R517 RES 20K 1 100MW THICK FILM R 418 20K R519 526 RES 45 3K 1 100MW THICK FILM R 418 45 3K R522 RES 49 9K 1 1OOMW THICK FILM R 418 49 9K R525 RES 15k 1 100MW THICK FILM R 418 15K R531 RES 14K 1 100MW THICK FILM R 418 14K R536 548 RES 4 02K 1 100MW THICK FILM R 418 4 02K R541 RES 100K 1 1OOMW THICK FILM R 418 100K R543 RES 499K 1 1OOMW THICK FILM R 418 499K R544 RES 7 5K 1 100MW THICK FILM R 418 7 5K R545 RES 1 74K 1 1OOMW THICK FILM R 418 1 74K R549 RES 3 65K 1 1000MW THICK FILM R 418 3 65K R560 RES 0499 1 100MW THICK FILM R 418 0499 R561 RES 26 7K 1 1OOMW THICK FILM R 418 26 7K R562 RES 66 5K 1 1000MW THICK FILM R 418 66 5K R563 RES 150K 1 100MW THICK FILM R 418 150K R564 RES 110K 1 1000MW THICK FILM R 418 110K RV301 304 VARISTOR VR 17 50315 326 346 SOCKET SO 72 50330 SOCKET PLCC 032 T A SO 143 32 TP301 304 308 310 CONNECTOR CS 985 U301 325 CMOS COMPLETE DDS SYNTHESIZER IC 1141 U302 12 BIT VOLTAGE OUTPUT DAC IC 1130 U303 IC DIFF AMP AMPO3GP IC 988 U305 308 339 343 IC J FET OP AMP TLE2081CD 967 U309 310 335 DUAL BIPOLAR JFET OPAMP 1203 U311 LARGE SCALE IC SMT LSI 216 U312 313 322 323 IC HEX SCHMITT INV TRIGG 74HC14 IC 1103 U314 327 344 IC FPGA XC5202 LSI 193 Replaceable Part
16. 28 Recalculated limits 1000 99 9860 to 100 0140 2 to Q 1kQ 0 999890 to 1 0001 10kQ to kQ 10kQ 9 99890 to 10 00110kQ to kQ 100kQ 99 9890 to 100 0110kQ to kQ IMQ 0 999890 to 1 0001 10MQ to MQ 10MQ 9 99590 to 10 00410MQ to MQ 100MQ 99 8470 to 100 1530MQ to MQ Calculate limits based on actual calibration resistance values and Model 2015 one year accuracy specifications See Verification limits 1 16 Performance Verification Verifying temperature Thermocouple temperature readings are derived from DC volts measurements For that rea son it is not necessary to independently verify the accuracy of temperature measurements As long as the DC volts function meets or exceed its specifications temperature function accuracy is automatically verified However temperature verification procedures are provided below for those who wish to separately verify temperature accuracy 1 Connect the DC voltage calibrator output terminals to the Model 2015 INPUT jacks using low thermal shielded connections Use 2 wire connections similar to those shown in Figure 1 1 2 Configure the Model 2015 for C units type J temperature sensor and 0 C simulated ref erence junction as follows A B C E Press SHIFT then SENSOR and note the unit displays the temperature units UNITS If necessary use the cursor and range keys to select C units Press ENTER The unit then displays the thermocouple type TYPE J
17. 564 566 567 569 CAP 1UF 10 25V CERAMIC C 495 1 C377 390 391 CAP 10U 2096 16V TANTALUM C 546 10 C392 393 500 504 510 512 519 522 532 CAP 1UF 1096 25V CERAMIC C 495 1 C395 515 CAP 220PF 1096 100V CERAMIC C 451 220P C503 CAP 33PF 596 100V CERAMIC C 465 33P C513 CAPACITOR C 576 022 C514 CAP 2200P 1 50V CERAMIC C 532 2200P C516 CAP 1UF 20 63V POLYCARBONATE C 482 1 C518 CAP 01 5 50V NPO C 514 01 C527 528 572 CAP 1000P 10 100V CERAMIC C 451 1000P C562 565 CAP 1000UF 20 50V ALUM ELEC C 469 1000 C568 2200UF 20 100 25 ALUM ELEC C 314 2200 C574 575 CAP 10UF 20 25V TANTALUM C 440 10 CR301 SCHOTTKY DIODE 121 302 303 DIODE SWITCHING MMBD914 RF 83 CR305 311 DIODE SWITCHING MMSD914T19 RF 112 CR330 331 DIODE SILICON W04M RF 46 Replaceable Parts 6 11 Table 6 3 Distortion DSP board parts list continued K eithley Circuit designation Description part no HS331 HEAT SINK HS 55 J1018 1019 1021 CONNECTOR HEADER CS 784 6 J1020 CONN MALE 3 PIN CS 784 3 J1028 1029 CONN BNC RIGHT ANGLE PLASTIC CS 506 J1030 CONN DUAL 10 PIN BERG CS 389 8 J1031 CONN MALE 5 PIN MOLEX 42491 CS 784 5 K301 RELAY MINI SIGNAL REL RL 163 L301 303 305 311 313 315 318 323 FERRITE CHIP 600 OHM BLM32A07 CH 62 L306 309 CHOKE CH 90 5 L310 319 321 FERRITE BEAD CH 91 L314 316 317 322 CHOKE CH 61 P1017 CABLE ASSEMBLY CA 123 1A Q301 TRANS N MOSFET VN0605T TG 243 Q302 T
18. Description Example To program the 10V DC comprehensive calibration step cal prot dc step4 Cal voltage Cal voltage 9 to 11 V 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 CAL PROT DC STEPA 10 Program 10V step STEP5 CALibration PRO Tected D C STEP5 Purpose Format Parameter Description Example STEP6 Calibration Reference To program the 100V DC comprehensive calibration step cal prot dc step5 Cal voltage Cal voltage 90 to 110 V B 11 STEP5 programs the 100V DC comprehensive calibration step The allow able range of the calibration voltage parameter is from 90 to 110 but 100 is recommended for best results CAL PROT DC ST EP5 10 CALibration PRO Tected D C STEP6 Purpose Format Parameter Description Example STEP7 0 Program 100V step 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 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 STE P6 lE CALibration PRO Tected D C STEP7 Purpose Format Parameter Description Exa
19. RMS sine wave 100dB THD Stanford Research Systems DS 360 Ultra Low Distortion Function Generator Miscellaneous Equipment Double banana plug to double banana plug shielded cable 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 Verification at 220V 50kHz using only the 5700A calibrator is adequate for most applications Performance Verification 1 5 The verification limits stated in this section have been calculated using only the Model 2015 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 2015 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 input value Using the Model 2015 one year accuracy specification for 10V DC of 30ppm of reading 5ppm of range the cal culated limits are Reading limits 10V x 10V x 30ppm 10V x 5ppm Reading limits 10V 0003 00005 Reading limits 10V 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
20. and down to snap the spring out of the fuse housing Carefully pull the spring and contact tip out of the housing Unplug cables e Unplug the display board ribbon cable from connector J1014 Unplug the transformer cables from connectors J1016 and 71015 Unplug the OPTION SLOT ribbon cable from connector 11017 Remove the fastening screw that secures the DMM board to the chassis One of these screws is located along the left side of the unit towards the rear and it also secures U114 The other screw is located at the right front of the chassis near the front rear switch 5101 During re assembly replace the board and start the IEEE 488 and RS 232 connector nuts and the mounting screw Tighten all the fasteners once they are all in place and the board is correctly aligned Remove the DMM board which is held in place by edge guides on each side by sliding it forward until the board edges clear the guides Carefully pull the DMM board from the chassis DSP board removal Perform the following steps to remove the DSP 136 board This procedure assumes that the case cover and the DMM board have been removed 1 2 Remove the nuts from the two BNC jacks on the rear panel Unplug cables Unplug the power entry module cable J1021 Unplug the transformer primary connections J1018 and J1019 Unplug the transformer cable from J1020 Unplug the DMM board connectors J1022 J1024 and J1026 Unplug the transformer
21. display test 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 displayed C The 12 digits and annunciators are sequentially displayed D Theannunciators located at either end of the display are sequentially displayed 4 When finished abort the display test by pressing EXIT The instrument returns to normal operation 4 6 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 Figure 4 4 Distortion digital circuitry block diagram Figure 4 5 Distortion analog circuitry block diagram Figure 4 6 Sine generator 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
22. 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 cal ibration steps except for LOCK NOTE Calibration will be only temporary unless the SAVE command is sent to permanently store calibration constants Example CAL PROT SAVE Save calibration constants B 8 Calibration Reference DATE CALibration PRO Tected D ATE Purpose To send the calibration date to the instrument Format cal prot date lt year gt lt month gt lt day gt Parameters lt gt 1998 to 2097 lt month gt 1 to 12 day 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 instrument 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 Examples CAL PROT DATE 1998 12 16 Send cal date 12 16 98 CAL PROT DATE Request cal date NDUE CALibration PRO Tected N D U E Purpose To send the next calibration due date to the instrument Format cal prot ndue year month day Parameters year 1998 to 2097 month 1 to 12 day 1 to 31 Q
23. from this device is done in a serial fashion 4 10 Troubleshooting RS 232 interface Serial data transmission and reception is performed by the TXDB and RXDB lines of the MPU U159 provides the necessary 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 buffer ing 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 trig ger input to minimize MPU control overhead At the factory trigger output is connected to line 1 of the Trigger Link connector resistor R267 installed Trigger input is connected to line 2 of the Trigger Link connector resistor R270 installed Troubleshooting 4 11 Analog circuitry Refer to Figure 4 3 for the following discussion on analog circuitry Figure 4 3 Analog circuitry block diagram AMPS Current Shunts K103 R158 R205 K102 U102 U103 U105 U112 U118 U111 U110 See Figure 4 5 AC Switching Distortion amp gt Analog Gain I KGG I Circuitry 1 I 1 I 1 DCV amp Ohms A D I Switching MUX amp Digital 101 0104 Circuitry 0105 0108
24. lt 30 ms ASCII READINGS TO RS 232 19 2K BAUD 55 s MAX INTERNAL TRIGGER RATE 2000 s MAX EXTERNAL TRIGGER RATE 400 s DC GENERAL LINEARITY OF 10VDC RANGE 2ppm of reading 1ppm of range DON TEMPERATURE CONTINUITY DIODE TEST INPUT PROTECTION 1000V all ranges MAXIMUM ZO LEAD RESISTANCE 10 of range per lead for 1000 and 1kQ ranges 1kQ per lead for all other ranges DC CURRENT INPUT PROTECTION 3A 250V fuse SHUNT RESISTOR 0 10 for 1A and 100mA ranges 100 for 10mA range CONTINUITY THRESHOLD Adjustable 1Q to 10000 AUTOZERO OFF ERROR Add 2ppm of range error 5uV for 10 minutes and 1 change OVERRANGE 120 of range except on 1000V 3A and Diode SPEED AND NOISE REJECTION RMS NOISE RATE READINGS S DIGITS 10V RANGE NMRR CMRR1 10 PLC 5 6 lt 15 pV 60 dB 140 dB 1 PLC 50 6 4yV 60 dB 140 dB 0 1 PLC 500 5 lt 22 uV 80 dB 0 01 PLC 2000 4 lt 150 pV 80 dB DC Notes 1 Add the following to ppm of range accuracy specification based on range 1V and 100V 2ppm 100mV 15ppm 1000 15ppm lt 1MQ 2ppm 10mA and 1A 2ppm 100mA 20ppm Speeds are for 60 Hz operation using factory default operating conditions RST Autorange off Display off Trigger delay 0 Speeds include measurement and binary data transfer out the GPIB Auto zero off Sample count 1024 auto zero off Auto zero off NPLC 0 01 Ohms 24 readings second 1 PLC 16 67ms 60Hz 20m
25. measurement speed a A 14 DC voltage DC current and resistance A 14 AC voltage and AC current rrura A 14 Temperature MEM 14 Calibration Reference Introduction rra Command KARTA Miscellaneous calibration commands 1 CODE sapan COUN S S S Sus ub EE a AC calibration commands 2 wo BICI qe P Distortion and function generator calibration commands IDIST STEPI ebrei ree oos DIST STEP2 uic titio eet rre tib tens ons BES Baa tereti trea p raa Manufacturing calibration commands PAC STEP SUAS S uite thee ene teda dB Gi EUN u a u E a taketak Remote error reporting eee reete tete rete ee EE Error AAE A emm Status byte EAV Error Available bit Generating an SRQ on error Detecting calibration step completion Using the OPC query e terret teres Using the OPC command Generating an SRQ on calibration complete C Calibration Program Introduction sa i eet o Computer hardware requirements Software requirements 2 2 Calibration equipment 2 General program instructions rra List of Illustrations
26. 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 personne perform routine procedures on the product to keep it operating for example setting the line voltage or replacing consumable materials Maintenance procedures are described in the manual The procedures explicitly state if the operator may perform them Otherwise they should be performed only by ser vice personnel Service personnel are trained to work on live circuits and perform safe installations and repairs of products 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 connector jacks or test fixtures The American National Standards Institute ANSI states that a shock hazard 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
27. reference current for OHMS is generated by the Ohms I Source circuit For 4 wire ohms measurements SENSE LO is connected to the circuit by turning on Q121 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 U110 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 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 Troubleshooting 4 13 Distortion digital circuitry Refer to Figure 4 4 for the following discussion on the distortion digital circuitry Figure 4 4 Distortion digital circuitry block diagram DIGITAL See Figure 4 2 EEPROM U326 U312 U313 U316 U317 U318 U319 ISO DISTO
28. sensing is to be turned on 2 Setthe calibrator to output DC volts and turn external sense off 2 10 Calibration 3 Perform the steps listed in Table 2 3 to complete DC volts calibration For each calibra tion step e Sei the calibrator to the indicated value and make sure it is in operate Press the ENTER key to calibrate that step Walt until the Model 2015 finishes each step The unit will display the CALI BRATING message while calibrating NOTE _ Ifyour 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 2015 display value to match the calibrator output voltage Table 2 3 DC volts calibration summary Calibration Calibrator step voltage Allowable range 10V 10 00000V 9V to 11V 10V 10 00000V 9V to 11V 100V 100 0000V 90V to 110V Calibration 2 11 Resistance calibration Completing the 100V DC calibration step ends the DC voltage calibration procedure The Model 2015 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 Q 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 bei the calibrator to the indicated value and pla
29. sure the Model 2015 display indicates the correct calibration current Press ENTER to complete each step Allow the Model 2015 to finish each step NOTE Ifyou performing DC only calibration proceed to Setting calibration dates Table 2 5 DC current calibration summary Calibrator Calibration step current Allowable range 10mA 10 00000mA 9mA to 11mA 100mA 100 0000mA 90mA to 110mA 1A 1 000000A 0 9A to 1 1A Calibration 2 13 AC voltage calibration Follow these steps for AC voltage calibration 1 Connect the calibrator to the Model 2015 INPUT HI and LO terminals as shown in Figure 2 4 Figure 2 4 Connections for AC volts calibration AC Voltage Calibrator Input HI Model 2015 f KEITHLEY Output HI 2 Perform the calibration steps summarized in Table 2 6 For each step e bei the calibrator to the indicated value and make sure the calibrator is in operate Press ENTER to complete each step Walt until the Model 2015 completes each step Table 2 6 AC voltage calibration summary Calibration step Calibrator voltage frequency 10mV AC at 1kHz 10 00000mV 1kHz 100mV AC at 1kHz 100 0000mV 1kHz 100mV AC at 50kHz 100 0000mV 50kHz 1V AC at 1kHz 1 000000V 1kHz 1V AC at 50kHz 1 000000V 50kHz 10V AC at 1kHz
30. 00 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 connected to humans Before performing any maintenance disconnect the line cord and all test cables To maintain protection from electric shock and fire replacement components in mains circuits including the power transformer test leads and input jacks must be purchased from Keithley Instruments Standard fuses with applicable national safety approvals may be used if the rating and type are the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component Note that selected parts should be purchased only through Keithley Instruments to maintain accu racy 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 clea
31. 03 404 406 409 411 414 416 RES 15k 1 100MW THICK FILM R 418 15K R405 408 410 412 RES 12 1 1 125MW METAL FILM R 391 12 1 R413 RES 13K 1 100MW THICK FILM R 418 13K R417 418 RES 15k 1 1OOMW THICK FILM R 418 15K R419 RES 10M 5 125MW METAL FILM R 375 10M R420 421 RES 10K 1 100MW THICK FILM R 418 10K U401 PROGRAMMED ROM 2000 800 U402 403 IC LATCHED DRIVERS UCN 5812EPF 1 732 401 CRYSTAL 4MHZ CR 36 4M Order current firmware revision for example 02 6 10 Replaceable Parts Table 6 3 Distortion DSP board parts list Keithley Circuit designation Description part no C301 310 352 505 508 532 538 571 CAP 1UF 10 25V CERAMIC C 495 1 C302 313 323 354 560 561 378 387 CAP 01UF 10 50 CERAMIC C 491 01 C303 325 355 399 511 550 573 344 CAP 10U 20 16V TANTALUM C 546 10 C304 305 396 397 CAP 2200P 196 50 CERAMIC C 532 2200P CAP 1UF 10 25 CERAMIC C 495 1 309 517 525 1000 10 100 CERAMIC C 451 1000P n CAP 1UF 10 25V CERAMIC C 495 1 C324 CAP 7 5P 10 100V CERAMIC C 452 7 5P C326 CAP 100U 20 16V ALUM ELEC C 547 100 C339 366 CAP 1UF 10 25V CERAMIC C 495 1 C346 347 CAP 47UF 20 100V ALUM ELEC C 521 47 C350 CAPACITOR C 473 4700 C353 357 388 389 CAP 01UF 1096 50 CERAMIC C 491 01 C358 365 523 524 CAP 100PF 5 100V CERAMIC C 465 100P C367 CAP 22UF 2096 25V TANTALUM C 440 22 C368 376 551 558 563
32. 0MW THICK FILM R 418 200 R267 270 RES 0499 1 100MW THICK FILM R 418 0499 R271 RES NET 245 R273 274 RES 475 1 125mW METAL FILM R 391 475 R277 RES 66 5K 1 1000MW THICK FILM R 418 66 5K R280 294 RES 49 9 1 1OOMW THICK FILM R 418 49 9 R283 RES 470 5 125MW METAL FILM R 375 470 R287 RES 1 28M 1 1 5W METAL FILM R 176 1 28M R288 289 290 333 RES 1 100MW THICK FILM R 418 1K R291 292 RES 47 5K 1 1000MW THICK FILM R 418 47 5K R297 278 281 RES 357 1 1OOMW THICK FILM R 418 357 R300 RES 2 15K 1 125MW THIN FILM R 423 2 15K R302 303 RES 499 1 100MW THICK FILM R 418 499 R304 RES 20K 1 100MW THICK FILM R 418 20K Replaceable Parts 6 7 Table 6 1 DMM mother board parts list continued K eithley Circuit designation Description part no R309 RES 1K 1 1 10W METAL FILM R 263 1K R310 RES 9 09K 1 1 10W METAL FILM R 263 9 09K R311 RES 392 1 1OOMW THICK FILM R 418 392 R312 313 RES 332 1 100MW THICK FILM R 418 332K R315 RES 100K 1 1OOMW THICK FILM R 418 100K R318 RES 73 2K 1 1000MW THICK FILM R 418 73 2K R320 RES 10 10 1OOMW THICK FILM R 418 10 R324 RES 2K 1 125mW METAL FILM R 391 2K R338 339 RES 49 9K 1 1000MW THICK FILM R 418 49 9K 5101 SWITCH PUSHBUTTON 8 POLE SW 468 TP102 106 CONN TEST POINT CS 553 U101 IC VOLTAGE REG LM317M 846 102 118 J FET TLE2081CD 967 U103 105 111 129 IC CMOS ANALOG SWIT
33. 1 Performance Verification Connections for DC volts verification Connections for AC volts verification Connections for DC current verification Connections for AC current verification Connections for resistance verification 100Q 10MQ range Connections for resistance verification LOOMQ range Connections for frequency verification Connections for total harmonic distortion verification Connections for function generator amplitude verification 2 Calibration Low thermal short connections 2 Connections for DC volts and ohms calibration Connections for DC and AC amps calibration Connections for AC volts calibration Connections for distortion calibration Connections for function generator calibration 1 Synthesizer connections for manufacturing calibration 3 Routine Maintenance Power module eir et 3 3 4 Troubleshooting Power supply block diagram 2 Digital circuitry block diagram Analog circuitry block diagram rr Distortion
34. 10 00000V 1kHz 10V AC at 50kHz 10 00000V 50kHz 100V AC at IKHz 100 0000V 1kHz 100V AC at 50kHz 100 0000V 50kHz 700V AC at IKHz 700 000V 1kHz 2 14 Calibration AC current calibration After the 700VAC at 1kHz point has been calibrated the unit will prompt you for 100mA at 1kHz 1 Follow these steps for AC current calibration Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2015 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 100mA at 1kHz 100 0000mA 1kHz 1A at 1kHz 1 000000A 1kHz 2A at 1kHz 2 000000A 1kHz Distortion calibration 1 Following AC current calibration the Model 2015 will prompt you for the first distortion calibration point see Table 2 8 1V AT 137 HZ Connect the low distortion function generator to the front panel INPUT jacks see Figure 2 5 Set the function generator to output a RMS sine wave at a frequency of 137Hz Press the Model 2015 ENTER key to complete the 137Hz calibration step The unit will prompt you for the second distortion calibration point 1V AT 844 HZ Set the fu
35. 125mW METAL FILM R 391 1K R110 133 RES NET 9K 1K MICRO DIVIDER TF 246 2 R111 165 182 190 200 279 284 296 298 RES 1 1OOMW THICK FILM R 418 1K 305 R112 164 RES 100K 1 125mW METAL FILM R 391 100K R114 RES 604 1 1OOMW THICK FILM R 418 604 R115 RES 5K 1 WIREWOUND R 249 5K R118 175 276 282 295 RES 10K 1 100MW THICK FILM R 418 10K R122 134 181 272 RES 1K 1 125mW METAL FILM R 391 1K R123 RES 73 2K 1 1OOMW THICK FILM R 418 73 2K R127 RES 33 2K 1 1OOMW THICK FILM R 418 33 2K R129 RES 215 1 1OOMW THICK FILM R 418 215 R130 176 177 179 183 186 191 193 336 RES 100K 1 1OOMW THICK FILM R 418 100K R135 RES 33 2K 1 1OOMW THICK FILM R 418 33 2K R137 143 152 RES 49 9K 1 125MW METAL FILM R 391 49 9K R139 148 163 RES 24K 5 1W 200V THICK FILM R 437 24K R140 256 299 334 RES 1 1OOMW THICK FILM R 418 1K R142 RES 10 5 125MW METAL FILM R 375 10 R145 156 321 322 RES 100 1 1OOMW THICK FILM R 418 100 R146 RES 1 1M 5 125MW METAL FILM R 375 1 1M R147 RES 732K 1 1OOMW THICK FILM R 418 732K R149 151 RES 150 1 1OOMW THICK FILM R 418 150 R150 RES 25 5K 1 1000MW THICK FILM R 418 25 5K R153 RES NET 3 6K MICRO DIVIDER TF 246 1 R154 230 325 328 335 337 RES 49 9K 1 1000MW THICK FILM R 418 49 9K R155 RES 4 99K 1 1000MW THICK FILM R 418 4 99K R157 RES 511 1 1000MW THICK FILM R 418 511 R158 RES 1 1 2W 4 TERMINAL MOLDED R 342 1 R159 166 185 275 307 314 RES
36. 1E3 10kQ 10kQ CAL PROT DC STEP7 10E3 9 to 11E3 100kQ 100kQ CAL PROT DC STEPS8 100E3 90E3 to 110E3 IMQ IMQ CAL PROT DC STEP9 1E6 900E3 to 1 1E6 Use exact calibrator resistance value for parameter 2 20 Calibration DC current calibration After the 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 2015 as shown in Figure 2 3 2 Perform the calibration steps listed in Table 2 11 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 Walt until the Model 2015 completes each step before continuing NOTE Ifyou are performing DC only calibration proceed to Programming calibration dates Table 2 11 DC current calibration programming steps Calibration Calibrator step current Calibration command Parameter range 10mA 10 00000mA CAL PROT DC STEP10 10 3 9E 3 to 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 2015 INPUT HI and LO terminal
37. 301 Source Output Sine Generator U301 4 Distortion Digital Circuitry see Figure 4 4 Sine generator 02 is a fixed frequency clock that forms the input to U301 the adjustable frequency sine wave generator The sine wave generator s frequency is set by the microprocessor through the FPGA U334 and the opto isolators U304 U320 U321 Attenuator U303 U334 U335 and U302 form the adjustable attenuator that adjusts the sine wave output amplitude The output amplitude is set by the microprocessor through the FPGA U334 and the opto isolators U304 U320 and U321 Troubleshooting 4 17 Filter U307 U336 and U337 form a low pass filter with a software selectable cutoff frequency This filter is used to reduce spurious noise in the sine wave output The filter cutoff frequency is set by the microprocessor through the FPGA U334 and opto isolators U304 U320 and U321 O utputs The Model 2015 has two outputs U305 U306 U307 and U308 form the main sine wave output stage The secondary output may be either an inverted sine wave of the same magnitude and fre quency as the main sine wave output or a 5V pulse output of the same frequency as the main sine wave One IC is a comparator that squares up the main sine wave output Another IC selects whether the sinewave or the comparator is fed to the output K301 selects between either 500 6000 output impedance 4 18 Troub
38. 475 1 125mW METAL FILM R 391 475 6 6 Replaceable Parts Table 6 1 DMM mother board parts list continued K eithley Circuit designation Description part no R160 167 172 RES 1 1OOMW THICK FILM R 418 1M R161 178 184 187 213 248 257 308 RES 100 1 100MW THICK FILM R 418 100 331 332 R168 RES 270 5 250mW METAL FILM R 376 270 R169 214 218 RES 4 99 1 100MW THICK FILM R 418 4 99K R188 RES 49 9 196 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 RESISTOR METAL FILM R 443 7 06K R195 RESISTOR METAL FILM R 443 70 6K R201 204 206 208 211 223 229 231 233 RES 4 75K 1 100MW THICK FILM R 418 4 75K R202 224 249 263 319 RES 10K 1 100MW THICK FILM R 418 10K R205 RES 10 5 1 8W METAL FILM R 246 10 R212 217 220 221 264 329 330 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 R225 RES 470 5 125MW METAL FILM R 375 470 R226 228 235 237 250 252 255 RES 475 1 100MW THICK FILM R 418 475 R234 RES 5 11K 1 100MW THICK FILM R 418 5 11K R238 244 254 293 RES 4 75K 1 100MW THICK FILM R 418 4 75K R241 RES 34K 1 100MW THICK FILM R 418 34K R243 259 RES 10 10 100MW THICK FILM R 418 10 R245 RES 475 1 100MW THICK FILM R 418 475 R246 RES 82 5 1 100MW THICK FILM R 418 82 5 R261 RES 200 1 10
39. 5 Initiate calibration by sending the following command CAL PROT INIT Calibrate step 0 with the following command CAL PROT AC STEPO Perform the entire remote comprehensive calibration procedure discussed earlier in this section See Comprehensive calibration Connect the synthesizer to the Model 2015 INPUT jacks as shown in Figure 2 7 Select the front input jacks with the INPUTS switch Set the synthesizer to output a RMS 3Hz sine wave then send the following command CAL PROT AC STEP14 Cal voltage Here Cal voltage is the actual 3Hz synthesizer signal amplitude you measured previously Set the synthesizer to output a 1V RMS 1kHz sine wave then send the following command CAL PROT AC STEP15 1E3 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 Routine M aintenance 3 2 Routine Maintenance Introduction The information in this section deals with routine type maintenance that can be performed by the operator and includes procedures for replacing both the line fuse and the amps fuse 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 locate
40. 75ms Applies to non sinewaves gt 5Hz Applies to 0 18 C and 28 50 C b TRIGGERING AND MEMORY READING HOLD SENSITIVITY 0 01 0 1 1 or 10 of reading TRIGGER DELAY 0 to 99 hrs 1ms step size EXTERNAL TRIGGER LATENCY 200ys lt 300us jitter with autozero off trigger delay 0 MEMORY 1024 readings MATH FUNCTIONS Rel Min Max Average StdDev of stored reading dB dBm Limit Test and mX b with user defined units displayed dBm REFERENCE RESISTANCES 1 to 99990 in 10 increments STANDARD PROGRAMMING LANGUAGES SCPI Standard Commands for Programmable Instruments REMOTE INTERFACE GPIB IEEE 488 1 IEEE 488 2 and RS 232C FREQUENCY AND PERIOD CHARACTERISTICS 2 RESOLUTION ACCURACY ACV FREQUENCY PERIOD GATE ppm of 90 DAY 1 YEAR RANGE RANGE RANGE TIME reading of reading 100 mV 3 Hz 333 ms 1s SLOW 0 333 0 01 to to to 0 15 MED 3 33 0 01 750 V 500 kHz 2us 10 ms FAST 33 3 0 01 A 8 Specifications Frequency Notes 1 Specifications are for squarewave inputs gt 10 of ACV range except 100mV range On 100mV range frequency must be gt 10Hz if voltage is 20mV 2 2096 overrange on all ranges except 750V range TEMPERATURE CHARACTERISTICS THERMOCOUPLE2 4 90 DAY 1 YEAR 23 C 5 C ACCURACY Relative to TYPE RANGE RESOLUTION Reference Junction J 200 to 760 C 0 001 C 405 C K 200 to 1372 0 001 C HO EG T 200 to 400 C 0
41. 95 1 232 C137 CAP 33PF 596 100V CERAMIC C 465 33P C145 CAP 1000pF 2096 50V CERAMIC C 418 1000P C146 CAP 3300UF 20 16V ALUM ELEC C 473 3300 C156 CAP 6800UF 20 100 16V ALUMINUM __ C 313 6800 C157 179 CAP 100PF 5 100V CERAMIC C 465 100P C160 163 174 180 186 207 208 214 218 CAP 1UF 10 25 CERAMIC C 495 1 C168 185 221 CAP 1UF 10 25 CERAMIC C 495 1 C171 177 CAP 2200P 10 100V CERAMIC C 430 2200P C175 CAP 10UF 20 25V TANTALUM C 440 10 6 4 Replaceable Parts Table 6 1 DMM mother board parts list continued Keithley Circuit designation Description part no C209 CAP 22UF 20 25 TANTALUM 440 22 C240 244 CAP 1000pF 20 50V CERAMIC C 418 1000P C241 CAP 01UF 10 50V CERAMIC 491 01 242 243 CAP 01UF 10 50V CERAMIC 491 01 251 253 47PF 10 100V CERAMIC 451 47 252 22PF 10 100V CERAMIC 451 22 254 263 47P 5 100 CERAMIC C 465 47P C255 258 CAP 270PF 5 100V CERAMIC 465 270 264 265 22P 5 100V CERAMIC 465 22 266 10000 20 63 POLY FILM 471 10000 CR102 103 DIODE BRIDGE VM18 RF 52 CR104 DIODE SILICON W04M RF 46 CR105 108 114 DIODE SWITCHING MMBD914 RF 83 CR106 DIODE BRIDGE PE05 RF 48 CR110 118 DIODE DUAL HSM 2822T31 RF 95 CR111 112 115 117 DIODE DUAL SWITCHING BAV99L RF 82 E101 102 SURGE ARRESTOR CG3 1 5L SA 4 J1006 CONN MICRODIN W GND FINGERS
42. ATE key 3 Set the Model 2015 for the 10mA 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 Table 1 4 DCI limits DCI range Applied DC current Reading limits 1 year 18 C 28 C 10mA 100mA 1A 3A 10 0000mA 100 0000mA 1 000000A 2 20000A 9 99460 to 10 00540mA 99 9100 to 100 0900mA 0 999160 to 1 000840A 2 197315 to 2 202685A Source positive and negative currents with values shown Performance Verification 1 13 Verifying AC current Check AC current accuracy by applying accurate AC voltage current at specific frequencies from the AC current calibrator to the Model 2015 input and verifying that the displayed readings fall within specified limits Follow these steps to verify AC current 1 Connect the Model 2015 AMPS and INPUT LO jacks to the calibrator as shown in Figure 1 4 Figure 1 4 Connections for AC current verification Model 2015 Amm Amps O utput AC Current Calibrator 2 Select the AC current function by pressing the ACI key then choose the SLOW integra tion rate with the RATE key 3 Setthe Model 2015 for the 1A range Source 1A and 2 2A 1kHz full sc
43. C128 C156 U144 D Common 116 CR117 HN C104 C108 Line Power U101 D Common Voltage Transformer Switch CR102 15V C131 C148 Common 0119 U 125 15V Power Switch T5V 5VRL A Common 5VD2 Power Transformer D Common 15VF F Common 15VF T5VF Troubleshooting 4 7 AC power is applied to the AC power module receptacle J1009 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 filaments 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 regulator 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 U144 37 CR116 CR117 C104 C106 0101 15V CR102 C148 U125 15 CR102 C131 U119 5V 5VRL CR103 C146 U124 5VD2 CR301 C350 U331 15VF CR330 C562 U348 15 CR330 C565 U349 5VF CR331 C568 U350 4 8 Troubleshooting Display board Display board components are shown in the digital circuitry block diagram in Figure 4 2 NVRAM ROM ROM U136 0156 0157 0156 0157 Keypad Display Board Cy Controller U401 68306 XTAL u
44. CH DG211DY 768 0104 MOSFET DRIVER TLP591B 877 U106 109 121 130 134 IC 8 STAGE SHIFT STORE MC14094BD 772 107 108 PHOTO DARLINGTON TRANS IC 911 PS2506L 1 U110 IC TRMS TO DC CONVERTER 637JR 796 0112 J FET OP AMP LF357M 966 U113 126 LTC1050CS8 791 0114 DUAL J FET OP AMP OP 282GS IC 968 U115 120 131 IC QUAD COMPARATOR LM339D 774 U116 IC DARLINGTON ARRAY ULN2003L 969 117 145 VOLT COMPARATOR LM311M 776 119 NEG VOLTAGE REG 15 500MA 195 79 15 123 DUAL AD706JR 910 124 IC 5V REGULATOR 500mA 7805 93 0125 POS VOLTAGE REG 15V 500 IC 194 78M15 U132 138 INTEGRATED CIRCUIT OPA177GS IC 960 U133 IC CMOS ANAL SWITCH DG444DY IC 866 135 16BIT MICROPROCESSOR LSI 154 MC68306FC16A U136 IC SERIAL EPROM 24LC16B LSI 153 U137 166 IC HI SPEED BIFET OP AMP AD711JR IC 894 U139 IC DUAL BIPOLAR OP AMP LT1124CS8 955 6 8 Replaceable Parts Table 6 1 DMM mother board parts list continued Keithley Circuit designation Description part no U141 IC PRECISION REFERENCE LM399 196 600A U142 IC OP AMP NE5534D IC 802 U144 IC LOW DROPOUT REGULATOR LM295T 962 U146 IC POS NAND GATES INVERT 74HCT14 IC 656 U147 164 IC DUAL D TYPE F F 74HC74 773 148 153 QUAD 2 NOR 74 02 809 0149 NCHAN LA
45. CS 792 J1007 CONN RT ANGLE MALE 9 PIN CS 761 9 J1008 CONN RIGHT ANGLE 24 PIN CS 501 J1014 CONN HEADER STRAIGHT SOLDER PIN CS 368 16 J1015 CONNECTOR HEADER CS 784 4 J1016 CONN MALE 5 PIN MOLEX 42491 CS 784 5 J1017 CONNECTOR HEADER STRAIGHT CS 368 14 SOLDER PIN J1022 LATCHING HEADER FRICTON SGL ROW 5 724 3 J1024 LATCHING HEADER 5 PIN CS 724 5 J1026 CONN BERG 4 PIN CS 724 4 K101 102 RELAY MINATURE DPDT TQ2E L2 5V RL 155 K103 RELAY MINI SIGNAL REL RL 163 L101 104 FERRITE CHIP 600 OHM BLM32A07 CH 62 L105 106 FERRITE CHIP 600 OHM BLM32A07 CH 62 L107 108 CHOKE CH 61 L109 CHOKE CH 63 22 LS101 BEEPER 5V 30MA BRT1209P 06 C EM 5 Q101 102 TRANS N CHAN MOSFET 2SK1412 TG 276 Q103 110 112 115 118 128 130 TRANS NPN MMBT3904 TG 238 Q104 109 113 114 120 123 126 135 TRANS N CHANNEL JFET SNJ132199 TG 294 Replaceable Parts 6 5 Table 6 1 DMM mother board parts list continued K eithley Circuit designation Description part no Q111 116 Q129 TRANS PNP MMBT3906L TG 244 Q117 121 122 N CHANNEL SILICON JFET TG 351 Q119 TRANS P CHANNEL JEET J270 TG 166 Q127 131 133 TRANS N MOSFET VN0605T TG 243 Q136 137 TRANS N CHANNEL JFET SNJ132199 TG 294 R101 102 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 R104 105 RES 549K 1 1 4W METAL FILM R 315 549K R106 RES 11K 1 1 10W METAL FILM R 263 11K R109 RES 1K 1
46. EAR LEFT 428 338B 1 MOUNTING EAR RIGHT 428 328E 1 POWER ROD 2001 320A 1 RFI CLIP CHASSIS 2001 366 1A 1 SWITCHPAD 2015 314A 1 TEST LEADS CA 22 1 TRANSFORMER TR 328C 1 TRANSFORMER TR 332A Specifications A 2 Specifications DISTORTION CHARACTERISTICS VOLTAGE RANGE 100mV 1V 10V 100V 750V user selectable INPUT IMPEDANCE 1MQ paralleled by lt 100pE DISPLAY RANGE 0 100 or 0 100 00dB RESOLUTION 0 000196 or 0 00001dB FUNDAMENTAL FREQUENCY RANGE 20Hz 20kHz HARMONIC FREQUENCY RANGE 40 2 50 2 FREQUENCY RESOLUTION 0 008Hz FREQUENCY ACCURACY 0 01 of reading FREQUENCY TEMPERATURE COEFFICIENT x100ppm over operating temperature range MEASUREMENT ACCURACY RESIDUAL MODE 1 Year 23 C 5 C DISTORTION THD and individual 0 8dB 0 004 or 87dB harmonic magnitudes 20Hz to 20kHz 20Hz to 20kHz THD n 1 5 dB 0 056 or 65dB 100Hz to 20kHz 20Hz to 20kHz SINAD 1 5dB 65dB 100Hz to 20kHz 20Hz to 20kHz AC Level 0 13 of reading Vrms 0 009 of range 20Hz to 20kHz Distortion Measurement Audio Filters None C Message CCITT Weighting CCIR ARM CCIR Weighting NUMBER OF HARMONICS INCLUDED IN THD CALCULATION 2 to 64 user selectable HI AND LO CUTOFF FILTERS bus settable 20Hz 50kHz Can be combined to form brickwall bandpass filter Distortion Measurement Reading Rate FUNDAMENTAL MINIMUM FREQUENCY FUNDAMENTAL READINGS ACQUISITION FREQUENCY PER MODE RANGE
47. EP10 CALibration PRO Tected D C STEP10 Purpose To program the 10mA comprehensive calibration step Format cal prot dc steplO Cal current Parameter Cal current 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 10E 3 value whenever possible for best results Example CAL PROT DC STEP10 10E 3 Program 10mA step Calibration Reference B 13 5 11 CALibration PRO Tected D C STEP11 Purpose Format Parameter Description Example STEP12 To program the 100mA comprehensive calibration step cal prot dc stepll lt Cal_current gt lt Cal_current gt 90E 3 to 110E 3 A STEP 11 programs the 100mA comprehensive calibration step The allow able range of the calibration current parameter is from 90E 3 to 110 3 Use the 100 3 value whenever possible for best results CAL PROT DC STEP11 0 1 Program 100mA step CALibration PRO Tected D C STEP12 Purpose Format Parameter Description Example To program the 1A comprehensive calibration step cal prot dc stepl2 Cal current Cal current 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 1A step
48. FF 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 100 OEE ON OFF OFF ON ON OFF Troubleshooting 4 23 Tables 4 12 through 4 16 can be used to trace the analog signal through the A D multiplexer Table 4 10 DCA signal switching Range 103 10mA ON 100mA OEE 1A OFF 3A OFF Table 4 11 ACA signal switching 0105 0105 0111 U105 U103 U103 Range 103 16 1 16 pin8 16 1 1A OFF JON ON OFF OEE OEE 3A OFF JON ON ON OFF 0163 to the final amplifier stage These tables show the MUX lines S3 S4 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 amplifier stage U166 Table 4 12 DCV signal multiplexing and gain Signal U129 0129 0129 Gain Range 0 163 1 8 9 0166 100mV 54 OFF x100 IV S4 OFF JON OFF 10 10V S4 ON OFF OEE 100V S4 OFF JON OFF x10 1000 54 OFF OEE xl Table 4 13 ACV and ACA signal multiplexing and gain Signal U129 0129 0129 Gain Range U163 1 8 9 0166 All 53 ON OFF OFF 4 24 Troubleshooting
49. INPUT jacks See Figure 1 9 Figure 1 9 Connections for function generator amplitude verification Model 2015 Connect IN PUT jacks to rear panel SOURCE OUTPUT KEITHLEY RANGE 2 Usethe SOURCE key to set the function generator operating modes as follows SINE OUT ON FREQ 1kHz IMPEDANCE HIZ AMPL 4 0000V 3 Press the ACV key to select the AC voltage function and choose the 10V range Verify that the AC voltage reading is between 3 986V and 4 014 V Calibration 2 2 Calibration Introduction Use the procedures in this section to calibrate the Model 2015 Calibration procedures include Comprehensive calibration Usually the only calibration required in the field Manufacturing calibration Usually only performed at the factory unless the unit has been repaired WARNING _ Thisinformation in this section is intended only for qualified service per sonnel D o 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 AC DC distortion or function generator 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 bus or the RS 232 port DC only distortion and function generator calibration may be performed individually if desired Calibration 2 3
50. ITATION OF WARRANTY This warranty does not apply to defects resulting from product modification without Keithley s express writ ten consent or misuse of any product or part This warranty also does not apply to fuses software non rechargeable batteries damage from battery leakage or problems arising from normal wear or failure to fol low instructions THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICU LAR USE THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REME DIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARIS ING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRU MENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EXCLUDED DAMAGES SHALL INCLUDE BUT ARE NOT LIMITED TO COSTS OF REMOVAL AND INSTALLATION LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PER SON OR DAMAGE TO PROPERTY 1 99 Model 2015 THD Multimeter Service M anual 1998 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Third Printing June 1999 Document Number 2015 902 01 Rev C 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
51. NRf gt 5 9 lt NRf gt STEP10 lt NRf gt STEP11 lt NRf gt 5 2 lt NRf gt except queries and CODE Calibration code or password default 1002015 Request the number of times the unit has been calibrated Initiate calibration Lock out calibration opposite of enabling cal with CODE command Request comprehensive cal lock state 0 locked 1 unlocked Save cal constants to EEROM Send cal date to 2015 Request cal date from 2015 Send next due cal date to 2015 Request next due cal date from 2015 DC cal steps Rear terminal short step Front terminal short circuit Open circuit 10V DC step 10V DC step 100V DC step 1kQ 4 wire step 10kO 4 wire step 100kQ 4 wire step IMQ 4 wire step 10mA DC step 100mA DC step 1A DC step NOTES 1 DC STEPO AC STEP14 and AC STEPI5 are one time factory calibration points and are valid only in man ufacturing calibration mode 2 Upper case letters indicated short form of each command For example instead of sending CALibration PROTected INITiate you can send CAL PROT INIT B 4 Calibration Reference Table B 1 Remote calibration command summary continued Command Description CALibration Calibration root command PROTected AC AC cal steps STEPI 10mV AC at 2 step STEP2 100mV AC at 1kHz step STEP3 100mV AC at 50kHz step STEPA 1V AC at step STEP
52. NSE 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 TO 25 PRINT 1 OUTPUT 4 Msg PRINT 1 OUTPUT 4 OPER CASE 6 TO 9 PRINT 1 OUTPUT 4 Msg PRINT T OUTPUT 4 EXTSENSE ON PRINT 1 OUTPUT 4 OPER PRINT 1 OUTPUT 4 OUT PRINT ENTER 4 INPUT 2 R R s Cmd Cmd STRS R CASE 10 13 23 J AMPS IF I 13 THEN J INPUT HI PRINT 1 OUTPUT 4 STBY PRINT Connect calibrator to 25 and INPUT LO jacks GOSUB KeyCheck PRINT 1 OUTPUT 4 Msg PRINT 41 OUTPUT 4 OPER END SELECT IF I gt 2 AND I 26 THEN GOSUB Settle PRINT 1 OUTPUT 16 C Cmd OPC Send cal command to 2015 GOSUB CalEnd Wait until cal step ends GOSUB ErrCheck Check for cal error NEXT I PRINT Ty OUTPUT 4 STBY INE INPUT Enter calibration date yyyy mm dd D PRINT 1 OUTPUT 16 CAL PROT DATE D GOSUB ErrCheck INE INPUT Enter calibration due date yyyy mm dd D PRINT 1 OUTPUT 16 CAL PROT NDUE D GOSUB ErrCheck PRINT 41 OUTPUT 16 CAL PROT SAVE Save calibration constants GOSUB ErrCheck PRINT 41 OUTPUT 16 CAL PROT LOCK Lock out calibration PRINT Calibration completed PRINT 41 OUTPUT 16 SYST PRES El z E
53. P Y101 U135 IN RS 232 RS 232 Uie e su IEEE 488 Bus Figure 4 2 Digital circuitry block diagram I Display DS401 XADTX XADCLK Analog 1 1 La XADTS 1 1 1 1 Circuitry XADRX Scan Control TRIG IN TDTX Distortion Trigger Di ion U146 U164 e TRIG OUT TDCLK Digital Circuit See Figure 4 4 TDTS XTDRX Trigger Link Microcontroller 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 microcontroller is generated by crystal Y401 Troubleshooting 4 9 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 are 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 supplie
54. RANS PNP MMBT3906L TG 244 R301 326 RES 2K 1 1OOMW THICK FILM R 418 2K R302 303 306 307 RES 1 1OOMW THICK FILM R 418 1K R304 305 RES 49 9 1 1OOMW THICK FILM R 418 49 9 R308 310 316 RES 10 10 1OOMW THICK FILM R 418 10 R309 311 313 320 557 RES 100 1 1OOMW THICK FILM R 418 100 R312 RES 174 1 1OOMW THICK FILM R 418 174 R314 317 319 339 342 534 535 RES 100 1 1OOMW THICK FILM R 418 100 R315 352 354 355 356 358 362 RES 475 1 100 THICK FILM R 418 475 R321 348 351 357 559 RES 475 1 1OOMW THICK FILM R 418 475 R322 500 RES 49 9 1 1OOMW THICK FILM R 418 49 9 R323 RES 30 1K 1 1000MW THICK FILM R 418 30 1K R327 509 510 511 RES 10K 1 100MW THICK FILM R 418 10K R328 330 331 523 RES 2K 1 100MW THICK FILM R 418 2K R329 332 334 364 390 501 512 514 546 RES 10K 1 1OOMW THICK FILM R 418 10K R338 520 530 RES 10 10 1OOMW THICK FILM R 418 10 R340 343 515 537 540 RES 200 1 1OOMW THICK FILM R 418 200 R341 344 507 508 527 532 533 558 RES 1 100MW THICK FILM R 418 1K R345 347 360 361 363 550 552 RES 2 21K 1 1OOMW THICK FILM R 418 2 21K R359 518 521 524 RES 7 5K 1 100MW THICK FILM R 418 7 5K 6 12 Replaceable Parts Table 6 3 Distortion DSP board parts list continued K eithley Circuit designation Description part no R392 394 542 547 553 555 RES 10K 1 100MW THICK FILM R 418 10K R396 399 RES 274 1 100MW THICK FILM R 418
55. RTION l ANALOG CIRUITRY CIRCUITRY See Figure 4 6 4 14 Troubleshooting DSP 0329 is a ADSP21061 digital signal processor that acquires ADC data performs all distor tion and noise calculations and communicates the results to the microprocessor The DSP has a 48 bit data bus and provides a 32 bit address bus It has serial ports for communicating with serial peripherals such as the ADC and DAC converters The DSP also has 1Mb of internal RAM for temporary data storage The DSP clock frequency of 33 0 MHz is controlled by oscillator Y303 DSP reset is per formed by U333 through U327 0326 ROM U330 stores the firmware code for the DSP JTAG interface J3 is the JTAG interface and it is used for monitoring and debugging DSP code FPGA U327 is an FPGA that provides all interface functions among the DSP sine generator opto isolators distortion analog circuitry and the microprocessor Upon power up the FPGA is con figured by U326 an EEPROM O pto isolators U312 U313 U317 and U322 are drivers for the opto isolators U316 U317 U318 U319 U320 U321 and U304 These isolators eliminate leakage currents and ground currents among the analog digital and sine wave generator circuits Troubleshooting 4 15 Distortion analog circuitry Refer to Figure 4 5 for the following discussion on distortion analog circuitry Figure 4 5 Distortion analog circuitry block diagram Amplifier Fi
56. S 1V AC at 50kHz step STEP6 10V AC at 1kHz step 5 7 10 AC at 50kHz step STEP8 100V AC at 1kHz step STEP9 100V AC at 50kHz step STEP10 700V AC at 1kHz step 8 1 100mA at 1kHz step STEP 12 1A AC at step STEP13 2A AC at IkHz step 5 14 1V AC at 3Hz step STEPI5 1V AC at 1kHz step DIST Distortion cal steps STEPI 1V RMS at 137Hz step STEP2 1V RMS at 844Hz step FGEN STEPI Calibrate function generator NOTES 1 DC STEPO AC STEP14 and AC STEPI5 are one time factory calibration points and are valid only in man ufacturing calibration mode 2 Upper case letters indicated short form of each command For example instead of sending CALibration PROTected INITiate you can send CAL PROT INIT Calibration Reference B 5 Miscellaneous calibration commands Miscellaneous commands perform miscellaneous calibration functions such as programming the calibration code and date These commands are discussed in detail in the following para graphs CODE CALibration PRO Tected CO D E Purpose To program the calibration code or password so that you can perform the cal ibration procedures Format cal prot code lt char_string gt Parameter Up to a 8 character string including letters and numbers Description The CODEcommand enables the Model 2015 calibration procedures when performing these procedures over the bus In general this command must be sen
57. SECOND Single acquisition 20 Hzto 100 Hz 14 or stored value 100 Hzto 1kHz 24 lkHzto 20 kHz 28 Automatic 20 Hzto 30 Hz 5 5 30 Hzto 400 Hz 6 400 Hzto 20kHz 6 6 Frequency Sweep Reading Rate NUMBER OF FREQUENCIES TIME seconds 5 0 2 30 1 1 100 3 5 200 6 9 Notes 1 Input signal at full scale 2 Vy 220 of range and harmonics gt 65dB Specifications A 3 3 Speeds are for default operating conditions RST and display off auto range off binary data transfer trig delay 0 4 Typical times frequencies in 400 4kHz range binary data transfer TRIG DELAY 0 Display OFE Auto Range OFE Data returned is THD measurement plus AC voltage GENERATOR CHARACTERISTICS FREQUENCY RANGE 10 20kHz FREQUENCY RESOLUTION 0 007Hz FREQUENCY ACCURACY 0 015 of reading 0 007Hz FREQUENCY TEMPERATURE COEFFICIENT lt 100ppm over operating temperature range SOURCE OUTPUT Waveform Sinewave Amplitude Range 2V rms 50Q and 600Q or 4V rms HI Z Amplitude Resolution 0 5mV rms 50Q and 6000 or 1mV rms HI 2 Amplitude Accuracy 0 3 of setting 2mV 4 Amplitude Temperature Coefficient Typically 0 015 C Amplitude Flatness 0 1dB 5 Output Impedance 500 10 6000 100 user selectable THD 64dB Noise 100pV rms DC Offset Voltage 1 2mV INV PULSE OUTPUT SINEWAVE MODE Frequency Same as source output Amplitude Range 2V rms 500 and 6000 or 4V rms HI Z Amplitude Resolutio
58. Select a type J temperature sensor then press ENTER The unit then displays the reference junction type JUNC SIM 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 Using the cursor and range keys set the reference junction temperature to 0 C then press ENTER to complete the temperature configuration process 3 Select the temperature function by pressing the TEMP key Source each of the voltages summarized in Table 1 7 and verify that the tempera ture 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 Applied DC Reading limits type voltage 1 year 18 C 28 J 7 659mV 190 6 to 189 4 C 0 5 to 0 5 C 42 280mV 749 5 to 750 5 C K 5 730mV 190 6 to 189 4 C 0 5 to 0 5 C 54 138mV 1349 2 to 1350 8 C Voltages shown are based ITS 90 standard using 0 C reference junction temperature See text for procedure to set reference junction temperature Performance Verification 1 17 Verifying frequency Follow the steps below to verify the Model 2015 frequency function 1 Connect the frequency synthesizer to the Model 2015 INPUT jacks See Figure 1 7 2 Set the synthesizer to output a IKHz RMS si
59. T DMOS QUADFET 893 SD5400CY U150 IC OPTOCOUPLER 261 1 IC 690 U151 152 IC 32KX8 STAT CMOS RAM D43256C LSI 93 100 154 IC QUAD D FLIP FLOP W CLK RESET 1 923 74 175 0155 OPTOCOUPLER 2601 IC 239 U156 PROGRAMMED ROM 2015 804 U157 PROGRAMMED 2015 803 U158 IC GPIB ADAPTER 9914A LSI 123 U159 IC 5V RS 232 TRANSCEIVER MAX202 IC 952 U160 IC OCTAL INTERFACE BUS 75160 IC 646 U161 IC OCTAL INTER BUS TRANS 75161 IC 647 U163 IC 8 CHAN ANA MULTIPLEXER DG408DY IC 844 U165 PROGRAMMED ROM 2000 802A02 VR101 114 VAR 576V METAL OXIDE VR 5 VR102 117 118 DIODE ZENER 6 0V BZX84B6V2 DZ 87 VR103 104 DIODE ZENER 6 8V MMSZ5235BTI DZ 100 VR105 106 115 116 DIODE ZENER 11V MMSZIITI DZ 103 VR107 VR108 DIODE ZENER 3 3V MMBZ5226BL DZ 94 VR109 DIODE ZENER 17V MMBZ5247BL DZ 104 VR110 DIODE ZENER 5 1V 7 84 5 1 DZ 88 VR112 VR113 DIODE ZENER 6 2V MMSZ6V2 DZ 97 Y101 CRYSTAL CR 55 1 Y102 OSCILLATOR HIGH SPEED CMOS 12MHZ CR 37 Order current firmware revision for example A01 Replaceable Parts 6 9 Table 6 2 Display board parts list Keithley Circuit designation Description part no C401 402 411 CAP 1UF 20 50V CERAMIC C 418 1 C403 404 405 407 409 410 412 CAP 1UF 10 25 CERAMIC C 495 1 C406 408 CAP 33PF 10 100V CERAMIC C 451 33P C413 CAP 22UF 20 6 3 TANTALUM 417 22 CR401 402 DIODE MBR0520LTI RF 103 DS401 DISPLAY DD 52 P1014 CABLE ASSEMBLY CA 123 16A R401 402 4
60. TEquipment Model 2015 An Interworld Highway LLC Company THD Multimeter Service Manual 1 SENSE o4WiE 4 KEITHLEY A LO dBm 500V INPUTS po x ica DELAY HOLD LIMITS _ ON OFF TEST CAL EX TRIG TRIG STORE RECALL FILTER REL CHED FRONVIBEAR V POWER AMPS SAVE SETUP CONFIG HALT GPIB 5232 SOURCE MEAS STEP SCAN DIGITS RATE EXIT ENTER THD Contains Servicing Information KEI T HLEY WARRANTY Keithley Instruments Inc warrants this product to be free from defects in material and workmanship for a period of 3 years 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 defective 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 transporta tion 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 LIM
61. 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 DATA OUT 10 MV 1 KHZ AC STEP1 DATA OUT 100 MV 1 KHZ AC STEP2 Calibration Program end program STI EPI C 5 C 6 Calibration Program DATA OUT 100 MV 50 KHZ AC STEP3 DATA OUT 1 V 1 KHZ AC STEP4 DATA OUT 1 V 50 KHZ AC STEP5 DATA OUT 10 V 1 KHZ AC STEP6 DATA OUT 10 V 50 KHZ AC STEP7 DATA OUT 100 V 1 KHZ AC STEP8 DATA OUT 100 V 50 KHZ AC STEP9 DATA OUT 700 V 1 KHZ AC STEP10 DATA OUT 100 MA 1 KHZ AC STEP11 DATA OUT 1 A 1 KHZ AC STEP12 DATA OUT 2 1 KHZ AC STEP13 DATA Apply 1V RMS 137Hz to INPUT jacks DIST STEP1 DATA Apply 1V RMS 844Hz to INPUT jacks DIST STEP2 DATA Connect SOURCE OUTPUT to INPUT jacks FGEN STEP1 Index Aborting calibration 2 AC calibration commands B 14 AC current calibratio AC voltage and AC current A 13 A 14 AC voltage calibration 2 13 lt 14115 gt AC STEP n Accuracy calculations 9 Addition
62. acy is within the limits stated in the instrument s one year accuracy specifications You can perform these ver ification 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 sonnel Do not attempt these procedures unless you are qualified to do so NOTE Ifthe instrument is still under warranty and its performance is outside specified limits contact your Keithley representative or the factory to determine the correct course of action Performance Verification 1 3 Verification test requirements Be sure that you perform the verification tests Under the proper environmental conditions 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 An ambient temperature of 18 to 28 C 65 to 82 F A relative humidity of less than 80 unless otherwise noted Warm up period Allow the Model 2015 Multimeter to warm up for at least one hour before conducting the ver ification procedures If the instrument has been subjected to temperature extremes t
63. adc full scale error 425 1 adc full scale error 438 Date of calibration not set 439 Next date of calibration not set Table B 5 Calibration error summary continued Error number and description 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 480 481 482 485 500 513 1514 515 516 517 610 100m vac dac error 1 vac error 10 vac dac error 100 vac dac error 100m vac zero error 100m vac full scale error 1 vac zero error 1 vac full scale error 1 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 1 aac zero error 1 aac full scale error 3 aac zero error 3 aac full scale error Input time constant error Frequency gain error Fgen full scale error Fgen DC offset error Fgen frequency gain error 1 vac distortion gain error Calibration data invalid AC calibration data lost DC calibration data lost Calibration dates lost Fgen calibration data lost Dist calibration data lost Questionable calibration Calibration Reference B 19 B 20 Calibration Reference Error queue As with other Model 2015 erro
64. ain Disassembly 5 2 Disassembly Introduction This section explains how to handle clean and disassemble the Model 2015 Multimeter Dis assembly drawings are located at the end of this section Disassembly 5 3 Handling and cleaning To avoid contaminating PC board traces with body oil or other foreign matter avoid touching the PC board traces while you are repairing the instrument Motherboard areas covered by the 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 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 flux to other areas of the circuit board Remove the flux from the work area when you have finished the repair by using pure water with clean foam tipped swabs or a clean soft brush Once you have removed the flux swab only the repair area with methanol then blow dry the board with dry nitrogen gas After cleaning allow the board to dry in a 50 C low humidity environment for several hours 5 4 Disassemb
65. ake 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 thermal equilibrium NOTE sure to connect the low thermal short properly to the LO and SENSE termi 2 3 nals Keep drafts away from low thermal connections to avoid thermal drift which could affect calibration accuracy Send the following command CAL PROT DC STEP1 After the Model 2015 completes this step remove the low thermal short and send this command CAL PROT DC STEP2 2 18 Calibration DC volts calibration After front panel short and open steps do the following 1 Connect the calibrator to the Model 2015 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 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 Perform the calibration steps summarized in Table 2 9 For each step Set the calibrator to the indicated voltage and make sure the unit is in operate Use the recommended voltage if possible Send the indicated programming command Change the voltage parameter if
66. al derating factor A 12 Analog circuitry 4 11 Analog signal switching states 4 21 Assembly drawings Calculating AC characteristics accuracy Calculating dB characteristics accurac Calculating dBm characteristics accuracy A 10 Calculating DC characteristics accuracy A 9 Calculating generator amplitude accurac Calculating resistance reading EDE Calibration Calibration code Calibration considerations 2 4 Calibration cycld 2 6 Calibration equipment C 2 Calibration program 1 Calibration reference Case cover removal Changing trigger link lines 5 10 CODE B 5 Command summary B 3 Component layouts Comprehensive calibratio Computer hardware requirements C 2 COUNt B 5 parreak DC calibration commands pal DC current calibratio DC voltage DC current and resistance A 13 A 14 DC volts calibration 2 9 DC STEPO B 17 Detecting calibration step completio Digital circuitry Digital circuitry checks Disassembl Disassembly procedures 5 6 DISP test Display board 4 8 Display board checks Distortion analog circuitry Distortion and function generator calibration commands Distortion calibratio Distortion characteristics A 11 Distortion digital circuitr DIST STEPI B 16 DIST STEP2 B 16 DMM board removal DSP board removal Environmental condition Error queue Error summa Example reading limit calculation 1 5 Factory service 6 2 FGEN STEP Front
67. ale 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 2 1kHz 1 year 18 C 28 C 1A 3A 1 000000A 2 20000A 0 99860 to 1 00140A 2 1949 to 2 2051A 1 14 Performance Verification Verifying resistance Check resistance by connecting accurate resistance values to the Model 2015 and verifying that its resistance readings are within the specified limits CAUTION Do not apply more than 1100V peak between INPUT HI and LO or more than 350V peak between SENSE HI and LO or instrument damage could occur Follow these steps to verify resistance accuracy 1 Using shielded 4 wire connections connect the Model 2015 INPUT and SENSE jacks to the calibrator as shown in Figure 1 5 Figure 1 5 Connections for resistance verification 1000 10 0 ranges Sense HI Sense HI Resistance Calibrator Model 2015 mmy Output AL ULTIM O a DE Ese Ot 2 4 2 0 oot oue E O utput 1O LO Sense LO 27 Note Use shielded low thermal cables to minimize noise Enable or disable calibrator external sense as indicated in procedure Set the calibrator f
68. alibration Do not send INIT before each calibration step Example CAL PROT INI LOCK T Initiate calibration CALibration PRO Tected LO CK Purpose To lock out comprehensive or manufacturing calibration Format cal prot lock Parameter None Description LOCK command allows you to lock out both comprehensive and man ufacturing calibration after completing those procedures Thus LOCK per foms the opposite of enabling calibration with the CODE command NOTE To unlock comprehensive calibration send the CODE command To unlock manufac turing calibration hold in Example CAL PROT LOC the SOURCE key while turning on the power K Lock out calibration Calibration Reference B 7 LO CK CALibration PRO Tected LO CK 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 2015 on calibration locked unlocked state Calibration must be enabled sending the CODE com mand before calibration can be performed Example CAL PROT LOCK Request cal lock state SAVE CALibration PRO Tected SAV E 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
69. ance Restoring factory defaults Routine maintenance 3 1 S Saving calibration constants 2 23 Setting calibration dates and saving calibration Setting the line voltage and replacing the line fuse 3 2 Short and open calibration 2 17 Sine generator circuit Software requirements Solder repairs 5 3 Specifications A 1 Static sensitive devices 5 4 Status byte EAV Error Available bit E 13 STEP12 B 13 Temperature A 13 Test considerations Troubleshooting Unlocking manufacturing calibration 2 24 Using the OPC command Using the OPC que Verification limits 1 5 Verification test requirements Verifying AC current Verifying AC voltage Verifying DC current 1 12 Verifying DC voltage Verifying frequency Verifying function generator amplitude 1 19 Verifying resistance Verifying temperature Verifying total harmonic distortion 1 18 Warm up period Service Form Model No Serial No Date List all control settings describe problem and check boxes that apply to problem Q Intermittent Analog output follows display Particular range or function bad specify L IEEE failure Q Obvious problem on power up Batteries and fuses OK Front panel operational All ranges or functions are bad Q Checked all cables Display or output check one Drifts Unable to zero Unstable Q Overload Q Will not rea
70. and 10 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 accuracy specifications as follows Accuracy 30ppm of reading 5ppm of range 30ppm x 5V 5ppm x 10V 150uV 50uV 200u V Thus the actual reading range is 5V 200uV 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 0 06 of reading 0 03 of range 0 0006 x 120V 0 0003 x 750V 0 072V 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 A 10 Specifications Calculating dBm characteristics accuracy As an example of how to calculate the actual reading limits for a 13dBm measurement with a
71. arts 6 3 Table 6 1 DMM mother board parts list K eithley Circuit designation Description part no 101 IC DUAL HIGH CMR SPEED IC 588 HCPL 2631 C102 CAP 01UF 10 1000V CERAMIC C 64 01 C103 128 149 161 167 169 172 178 223 CAP 1UF 10 25V CERAMIC C 495 1 250 C104 CAP 100UF 20 63V ALUM ELEC C 403 100 C105 CAP 22UF 2096 400V FILM C 513 22 C106 CAP 15P 1 100V CERAMIC C 512 15P C107 CAP 1UF 20 50V CERAMIC C 418 1 C108 CAP 1UF 20 100V CERAMIC C 436 1 C109 CAP 2 2UF 20 63V POLYCARB C 480 2 2 110 141 150 158 176 219 220 222 224 47P 5 100V CERAMIC C 465 47P 226 C111 116 118 122 153 155 202 210 CAP 1UF 10 25 CERAMIC C 495 1 225 227 C112 248 CAP 01 5 50V NPO C 514 01 C113 114 119 126 247 CAP 1000P 10 100V CERAMIC C 451 1000P C115 CAP 33UF 20 63V POLYCARBONATE C 482 33 C117 147 151 191 234 237 CAP 1UF 20 50V CERAMIC C 418 1 C120 270 5 100V CERAMIC C 465 270P C121 132 134 140 CAP 220PF 1096 100V CERAMIC C 451 220P C123 245 CAP 1000P 10 100V CERAMIC C 451 1000P C124 133 154 159 181 192 196 212 213 CAP 1UF 10 25 CERAMIC C 495 1 230 C125 138 139 142 152 162 173 190 204 CAP 1UF 10 25 CERAMIC C 495 1 206 C131 148 CAP 2200UF 2096 35V ALUM ELEC C 468 2200 C135 183 187 197 198 203 249 CAP 1UF 10 25 CERAMIC C 495 1 C136 170 182 193 194 199 200 201 233 CAP 1UF 10 25V CERAMIC C 4
72. asic supplied with MS DOS 5 0 or later MS DOS version 5 0 or later HP style Universal Language Driver CECHP EXE supplied with Keithley and CEC interface cards listed above Calibration equipment The following calibration equipment is required Fluke 5700A Calibrator Low distortion function generator Keithley Model 8610 Calibration Short Double banana plug to BNC cable See Section 2 for detailed equipment information Calibration Program C 3 General program instructions 1 With the power off connect the Model 2015 and the calibrator to the IEEE 488 interface of the computer Be sure to use shielded IEEE 488 cables for bus connections 2 Turn computer the Model 2015 and the calibrator Allow the Model 2015 and the calibrator to warm up for at least one hour before performing calibration 3 Make sure the Model 2015 is set for a primary address of 16 Use the front panel GPIB key to check or change the address 4 Make sure the calibrator primary address is at its factory default setting of 4 Make sure that the computer bus driver software CECHP EXE is properly initialized 6 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 KI002015 If the calibration code has been changed modify the CAL PROT CODE parameter accordingly 7 Run the program and follow the prom
73. cable J1031 Remove all seven screws that secure the DSP board to the chassis Slide the board toward the front of the chassis until the BNC jacks have cleared the chas sis and the board is clear of the guide pins then remove the board During re assembly replace the board by lining up the guide pins over the slots then slide the board toward the rear Loosely install all screws then install and tighten the BNC jack nuts Tighten all screws 5 8 Disassembly Front panel disassembly Use the following procedures to remove the display board and or the pushbutton switch pad NOTE You must first remove the case cover the front rear input switch and the front input terminal wires as described earlier in this section 1 Unplug the display board ribbon cable from connector J1014 2 Remove the front panel assembly This assembly has four retaining clips that snap onto the chassis over four pem nut studs Two retaining clips are located on each side of the front panel Pull the retaining clips outward and at the same time pull the front panel assembly forward until it separates from the chassis 3 Using a thin bladed screw driver pry the plastic PC board stop located at the bottom of the display board until the bar separates from the casing Pull the display board from the front panel 4 Remove the switch pad by pulling it from the front panel Removing power components The following procedures to remove the power transfo
74. ce the unit in operate If the cali brator cannot output the exact resistance value use the Model 2015 left and right arrow keys and the range keys to adjust the Model 2015 display to agree with the calibrator resistance Press the ENTER key to calibrate each point Walt for the Model 2015 to complete each step before continuing Table 2 4 Ohms calibration summary Calibration Calibrator step resistance Allowable range IKO 1kQ 0 9kQ to 1 1kQ 10kQ 10kQ 9kQ to 11kQ 100kQ 100kQ 90kQ to 110kQ IMQ IMQ 0 9MQ to 1 1MQ Nominal resistance Adjust Model 2015 calibration parameter to agree with actual value 2 12 Calibration DC current calibration After the IMQ resistance point has been calibrated the unit will prompt you for 1OmA Fol low these steps for DC current calibration 1 Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2015 as shown in Figure 2 3 Figure 2 3 Connections for DC and AC amps calibration Current Calibrator Model 2015 Kerne C LO N ote Be sure calibrator is set for normal current output 2 Calibrate each current step summarized in Table 2 5 For each step bei the calibrator to the indicated DC current and make sure the unit is in operate Make
75. d applied input Q Calibration only Certificate of calibration required L 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 ent Interworld Highway LLC Company TEquipm KEI I HLEY Keithley Instruments Inc 28775 Aurora Road Cleveland O hio 44139 Printed in the U S A
76. d by U144 5VD and U101 237V 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 strob ing the columns and reading all rows for each strobed column Key down data is interpreted by the display microcontroller and sent back to the main microprocessor using proprietary encod ing 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 18 bit address bus It also has parallel and serial ports for controlling various circuits For example the 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 through C241 on power up by the 5VD power supply 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 and U152 provide temporary operating storage U152 stores the DO D7 bits of each data word and U151 stores the D8 D15 bits Semi permanent storage facilities include U136 This IC stores such information as instrument setup and calibration constants Data transmission
77. d 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 perform the following steps 1 Place the tip of a flat blade screwdriver into the power module by the fuse holder assem bly 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 type and rating listed If the instrument repeatedly blows fuses locate and correct the cause of the trouble before replacing the fuse 3 Ifconfiguring the instrument for a different line voltage remove the line voltage selector 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 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 Power module Model 2015 KEITHLEY TRIGGER LINK Line Voltage Selector Window Fuse Holder Assembly Table 3 1 Power line fuse Line Voltage Rating K eithley Part No 100 120V 1 2A 250V 5 x 20 mm slow blow
78. digital circuitry block diagram Distortion analog circuitry block diagram rs Sine generator circuitry block diagram rra 5 Disassembly Trigger link line connections 2 2 5 10 List of Tables 1 Performance Verification Recommended verification equipment 1 DC V reading limits 22 02 EE redding HOEren etait irae DCT BAU GS BOA Ee Limits for resistance verification rrako Thermocouple temperature verification reading limits 2 Calibration Recommended equipment for comprehensive calibration Comprehensive calibration procedures L DC volts calibration summary Ohms calibration summary rrua DC current calibration summary rra AC voltage calibration summary rr AC current calibration summary rr Distortion and function generator calibration summary DC voltage calibration programming steps Resistance calibration programming steps DC current calibration programming steps AC voltage calibration programming steps AC current calibration programming steps Distortion and function generator calibration steps Recommended equipment for manufacturing calibrat
79. ding SLOW 3 Hz 300 kHz ACI all ranges 6153 1 4 MED 30 Hz 300 kHz 6154 4 8 MED 30 Hz 300 kHz 6153 22 FAST 300 Hz 300 kHz 6 35 FAST 300 Hz 300 kHz ADDITIONAL LOW FREQUENCY ERRORS of reading SLOW MED FAST 20Hz 30Hz 0 0 3 30Hz 50Hz 0 0 50Hz 100Hz 0 0 1 0 100Hz 200Hz 0 0 0 18 200Hz 300Hz 0 0 0 10 gt 300Hz 0 0 0 AC SYSTEM SPEEDS 5 FUNCTION RANGE CHANGE 4 s AUTORANGE TIME 3 s ASCII READINGS TO RS 232 19 2K BAUD 50 s MAX INTERNAL TRIGGER RATE 300 s EXTERNAL TRIGGER RATE 260 s Specifications A 7 AC GENERAL INPUT IMPEDANCE 1MQ 2 paralleled by lt 100 ACV INPUT PROTECTION 1000Vp MAXIMUM DCV 400V on any ACV range ACI INPUT PROTECTION 250V fuse BURDEN VOLTAGE 1A Range lt 0 3V rms Range lt 1 rms SHUNT RESISTOR 0 1Q on all ACI ranges AC CMRR gt 70dB with 1kQ in LO lead MAXIMUM CREST FACTOR 5 at full scale VOLT HERTZ PRODUCT lt 8 x 107 V Hz OVERRANGE 120 of range except on 750V and 3A ranges AC Notes 1 Specifications are for SLOW rate and sinewave inputs gt 5 of range Speeds are for 60 Hz operation using factory default operating conditions RST Auto zero off Auto range off Display off includes measurement and binary data transfer out the GPIB 0 01 of step settling error Trigger delay 400ms Trigger delay 0 DETector BANDwidth 300 NPLC 0 01 Maximum useful limit with trigger delay 1
80. e 2 15 Recommended equipment for manufacturing calibration Keithley 3930A or 3940 Frequency Synthesizer IN RMS 3Hz 5 1V RMS 1kHz 5ppm Keithley Model 2001 or 2002 Digital Multimeter 1V 3Hz AC 0 13 Keithley Model 8610 Low thermal short Unlocking manufacturing calibration To unlock manufacturing calibration press and hold in the SOURCE key while turning on the power Measuring synthesizer signal amplitude The 3Hz synthesizer signal amplitude must be accurately measured using the digital multim eter listed in Table 2 15 Proceed as follows 1 Connect the synthesizer output to the digital multimeter INPUT jacks See Figure 2 7 for typical connections 2 Turn on the synthesizer and multimeter and allow a one hour warm up period before measuring 3 Set the synthesizer to output a IV RMS sine wave at 3Hz measure and record the signal amplitude Calibration 2 25 Front panel manufacturing calibration 1 Connect the low thermal short to the rear panel input jacks and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium Press in and hold the SOURCE key while turning on the power 3 Press SHIFT then CAL select RUN then enter the appropriate calibration code default 002015 Select ALL at the CAL RUN prompt 5 Press ENTER Perform the entire front panel comprehensive calibration procedure discussed earlier in this section See Compr
81. e case Removing Grounding Screws Remove the two grounding screws that secure the case to the chassis They are located on the bottom of the case at the back 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 NOTE To gain access to the components under the DMM board shield remove the shield which is secured to the DMM board by a single screw DMM board removal Perform the following steps to remove the DMM 106 board This procedure assumes that the case cover is already removed 1 Remove the IEEE 488 and RS 232 fasteners The IEEE 488 and the RS 232 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 screw driver in the notch on the pushrod Gently twist the screw driver while pulling the rod from the shaft Disassembly 5 7 Disconnect the front and rear input terminals You must disconnect these input terminal connections for both the front and rear inputs INPUT HI and LO SENSE HI and LO AMPS Remove all the connections except the front AMPS 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 fuse hous ing Push the wire forward
82. e reading accuracy into the dB equation yields 10 036mV _ _ 9 964mV __ dBm 20 log 10V 60 03133dB 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 per tinent 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 must be added for DC voltages over 500V Before calculating accuracy study the associated specification notes carefully to see if any derating fac tors apply A 12 Specifications O ptimizing measurement accuracy The configurations listed below assume that the multimeter has had factory setups restored DC voltage DC current and resistance Select 6 digits 10 PLC filter ON up to 100 readings fixed range Use REL on DC voltage and 2 wire resistance measurements Use 4 wire resistance measurements for best accuracy AC voltage and AC current Select 6 digits 10 PLC filter ON up to 100 readings fixed range Temperature Select 6 digits 10 PLC filter ON up to 100 readings Distortion Select 6 digits filter ON up to 100 readings distortion frequency AUTO autorange ON O ptimizing measurement speed The configurations listed below assume that the multimeter has had factory setups resto
83. e values for each range 1 10 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 2015 inputs and verifying that the displayed readings fall within specified ranges CAUTION 1100 V peak between INPUT HI and INPUT LO or 8x 107 V Hz input because instrument damage may occur Follow these steps to verify AC voltage accuracy 1 Connect the Model 2015 HI and LO INPUT jacks to the AC voltage calibrator as shown in Figure 1 2 Figure 1 2 Connections for AC volts verification AC Voltage Amplifier Note Amplifier required only for 700V 50kHz output 000000 Input HI Model 2015 KEITHLEY Output HI EA Ol Output Shielded cable LO AC Voltage Calibrator COOOOOOoOoO0oO0of C C 2 Performance Verification 1 11 2 Select the AC volts function by pressing the ACV key then choose the SLOW integra tion rate with the RATE key 3 Set the Model 2015 for the 100mV range make sure that REL is disabled Source 1kHz and 50kHz AC voltages for each of the ranges summarized in Table 1 3 and make sure that the respective Model 2015 readings fall within stated limits
84. eady do the following 1 Repeatedly test the MAV 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 polling When MAV is set a message is available in the output queue and you can read the output queue and test for an ASCII 1 After reading the output queue repeatedly test MAV again until it clears At this point the calibration step is completed Using the O PC command The OPC operation complete command can also be used to detect the completion of each calibration step 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 oper ation complete bit in the standard event enable register allowing operation com plete 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 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 ope
85. ehensive calibration 7 Connect the synthesizer to the Model 2015 front panel INPUT jacks as shown in Figure 2 7 Select the front input jacks with the INPUTS switch Figure 2 7 Synthesizer connections for manufacturing calibration BN C to D ual Model 3930A or 3940 Synthesizer Banana Plug Model 2015 Adapter KEITHLEY Main Function Output 50Q BNC Coaxial Cable Note Synthesizer 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 1kHz with the following prompts Low frequency cal Set the synthesizer 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 synthesizer amplitude you measured previously then press ENTER e Frequency cal Set the synthesizer to output a RMS sine wave Enter 1 000000KHz at the prompt then press ENTER 9 Setthe calibration dates then save calibration to complete the process 2 26 Calibration Remote manufacturing calibration 1 10 Connect the low thermal short to the rear panel input jacks and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium Press in and hold the SOURCE key while turning on the power Enable calibration by sending the CODE command For example the default command is CAL PROT CODE 100201
86. es iae eise e ebrio Assembly drawings uu rete err ok ae eH euch Eee Disassembly procedures Case cover removal entender dtes DMM board removal DSP board removal 5 certe metn Front panel disassembly 1 Removing power components Instrument reassembly rka Input terminal wire connections Power module wire connections Changing trigger link lines rra Main CPU firmware replacement sa 6 Replaceable Parts Introduction P PP x Parts lists Jaa H Ordering information 2 Factory SetVIGe ter eee bee Component layouts auro reggaea arterian A Specifications Accuracy Calculating DC characteristics accuracy Calculating AC characteristics accuracy Calculating dBm characteristics accuracy Calculating dB characteristics accuracy Distortion characteristics Calculating generator amplitude accuracy A 12 Additional derating factors Optimizing measurement accuracy 1 4011 A 13 DC voltage DC current and resistance A 13 AC voltage and AC current rss A 13 Temperature rrura oorr re rrt rrr io HERO EH EIE CERRAR A 13 Optimizing
87. es 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 equipment may be impaired Do not exceed the maximum signal levels of the instruments and accessories as defined in the specifications and operating information and as shown on the instrument or test fixture panels or switching card When fuses are used in a product replace with same type and rating for continued protection against fire hazard Chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections If you are using a test fixture keep the lid closed while power is applied to the device under test Safe operation requires the use of a lid interlock Ifa screw is present connect it to safety earth ground using the wire recommended in the user documen tation The symbol an instrument indicates that the user should refer to the operating instructions located the manual The N symbol on an instrument shows that it can source or measure 10
88. fer standard 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 1 2 50kHz DC current 1 2 Resistance 10V x5ppm 10mV 710ppm 10mA 60ppm 100mA x190ppm 1kQ 412ppm 100V ppm 100mV 200ppm 100mA 70ppm 1 690 10kQ 1 1ppm 1 V 82ppm 1A 110ppm 2 670 100kQ 13ppm 10 82 1MQ 18ppm 100V x90ppm 700V x85ppm 1V RMS sine wave 137Hz 100dB THD 1V RMS sine wave 844Hz 100dB THD Stanford Research Systems DS 360 Ultra Low Distortion Function Generator 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 points require 1kHz only All calibrator specifications are 90 day 23 C 5 C specifications and indicate total absolute uncertainty at specified output Calibration 2 7 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 calibration process NOTE The Model 2015 will not resp
89. he drawings are located at the end of this section of the manual Front Panel Assembly 2015 040 Chassis Transformer Power Module Assembly 2015 050 Front Panel Chassis Assembly 2015 051 Chassis Assembly 2015 052 2015 053 Final Inspection 2015 080 5 6 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 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 se cure the rear bezel to the chassis Pull the bezel away from th
90. he stated current and frequency Send the indicated programming command Walt until the Model 2015 completes each step before continuing Table 2 13 AC current calibration programming steps Calibration step Calibrator current frequency Calibration command 100mA at 1kHz 100 0000mA 1kHz CAL PROT AC STEP11 1A at 1kHz 1 000000A 1kHz CAL PROT AC STEP 12 2A at 1kHz 2 000000A 1kHz CAL PROT AC STEP13 Distortion calibration 1 Connect the low distortion function generator to the front panel INPUT jacks see Figure 2 5 Set the function generator to output a RMS sine wave at a frequency of 137Hz 3 Send the following command to perform the 137Hz calibration step see also Table 2 14 CAL PROT DIST STEPI Set the function generator to output a 1V RMS sine wave at a frequency of 844Hz 5 Send the following command to perform the 844Hz calibration step CAL PROT DIST STEP2 Table 2 14 Distortion and function generator calibration steps Calibration step Calibration signal or connections Calibration command Distortion 1V at 137Hz I V RMS 137Hz sine wave CAL PROT DIST STEPI Distortion 1V at 844Hz I V RMS 844Hz sine wave CAL PROT DIST STEP2 Function generator SOURCE OUTPUT to INPUT CAL PROT FGEN STEP1 Calibration 2 23 Function generator calibration 1 Connect the rear panel SOURCE OUTPUT jack to the front panel INPUT jacks see Fig ure 2 6 2 Send the following command to comp
91. hich 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 AC DIST FGEN DCV DCI and ohms DC DC voltage DC current and resistance calibration ACV and ACI AC AC voltage and AC current Distortion DIST Calibrate distortion Function generator FGEN Calibrate function generator Perform AC calibration first if distortion or function generator calibration is done separately Front panel short and open calibration At the Model 2015 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 Low thermal short connections 5 HI Model 2015 Model 8610 Low thermal short PERIOD 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 Calibration 2 9 2 Press ENTER to s
92. hose 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 2015 Multimeter requires a line voltage of 100V 120V 220V 240V 10 and a line frequency of 45Hz to 66Hz and 360Hz to 440Hz 1 4 Performance Verification Recommended test equipment 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 the calibrator will add to the uncertainty of each measurement Table 1 1 Recommended verification equipment Fluke 5700A Calibrator AC Voltage 50kHz 700V 375ppm AC voltage AC current DC voltage 1kH 2 50kH 2 DC current 1kHZ Resistance 100mV 14ppm 100mV 200ppm 10mA 60ppm 1 690 1000 17 1 0 7 1 0 82 100mA 70ppm 2 2 682 1 12 10 5 10 82 1A 110ppm 10kQ 1 1ppm 100V 7ppm 100V 90ppm 2 2A 94ppm 100kQ 13ppm 1000 9 700 85 18 10 9 37 100MQ 120ppm Fluke 5725A Amplifier 1V RMS 1kHz 5ppm Keithley 3930A or 3940 Frequency Synthesizer 1kHz 0 95V
93. ibration Format cal prot fgen stepl Parameter None Description FGEN STEP1 performs function generator calibration Connect the rear panel SOURCE OUTPUT jack to the front panel INPUT jacks before send ing this command Example CAL PROT FGEN STEPI Perform function generator calibration Calibration Reference B 17 Manufacturing calibration commands Three calibration steps are only performed at the factory or when the unit has been repaired CALibration PROTected AC S CALibration PROTected AC S CALibration PROTected DC S AC STEP lt 14 15 gt EP14 15 EPO 1V AC at 3Hz 1V AC at IKHz Rear terminal short circuit CALibration PRO Tected AC STEP 14 15 gt Purpose Format Parameters Description Examples D C STEPO To program individual AC manufacturing calibration steps cal prot ac stepl4 Cal voltage cal prot ac stepl5 Cal frequency Cal voltage 1 1V nominal Cal frequency 1E3 1kHz nominal The AC STEP14 and AC STI 15 commands program the two manu facturing AC calibration steps The appropriate signal must be connected to the instrument when programming each step as summarized by the parame ters listed above CAI CA L PROT AC STEP14 1 L PROT AC STEP15 1E3 CALibration PRO Tected D C STEPO Purpose Format Parameter Description Example Prog
94. in 7 Pin 3 switched to Pin 4 4 22 Troubleshooting Table 4 7 Q2 signal switching Range 0101 0102 0114 0136 0109 101 K102 0113 0105 0104 0108 0121 1000 ON ON OFF OFF ORE ISET OFF OFF ON IKO ON ON OFF OFF ORE SET OFF OFF ON 10kQ ON OFF OFF ORE ISET OFF OFF ON 100kQ ON ON OFF OFF ORE ISET OFF OFF IMQ ON ON OFF OFF ORE SET OFF OFF ON 10 ON ON OFF OFF ON SET IRESETOFF OFF OFF 100MQ ON ON OFF OFF ON SET IRESETOFF OFF OFF ON 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 QA signal switching Range 0101 0102 OUA 0136 0109 101 0113 0105 0104 0108 0121 1000 ON OFF OFF OFF SET ON OFF OFF OFF ON 1kQ ON ON OFF OFF OFF SET ON OFF OFF OFF ON 10kQ ON ON OFF OFF OFF SET ON OFF OFF OFF ON 100kQ ON ON OFF OFF OFF SET ON OFF OFF OFF ON IMQ ON ON OFF OFF OFF SET ON OFF OFF OFF ON 10MQ ON ON OFF OFF ON SET OFF ON OFF OFF ON 100MQ ON ON OFF OFF ON SET OFF ON OFF OFF ON K101 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Table 4 9 Q2 04 reference switching Range 0 133 0 7 0133 77 0123 0125 0124 0126 0120 100Q OFF ON ON ON OFF OFF ON 1kQ OFF ON ON ON OFF O
95. ing the power transformer be sure to re connect the black ground wire to the mounting stud on bottom of the chassis Be sure to install the bottom 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 Front wire color Rear wire color INPUT HI Red White Red INPUT LO Black White Black SENSE HI Yellow White Yellow SENSE LO Gray White Gray AMPS White Power module wire connections Use the information in Table 5 2 and DETAIL B of drawing 2015 050 to connect power mod ule wires Table 5 2 Power module wire colors Location Wire color Top wire Gray Right top Violet Right bottom White Left top Red Left bottom Blue 5 10 Disassembly Changing trigger link lines The Model 2015 uses two lines of the Trigger Link rear panel connector as External Trigger EXT TRIG input and Voltmeter Complete VMC output At the factory line 1 is configured as VMC and line 2 as EXT TRIG NOTE Line 1 3 or 5 of the Trigger Link can be configured as while line 2 4 or 6 can be configured as EXT TRIG You can change trigger link line configurations by moving the position of resistors inside the unit Perform the following steps to change trigger link lines WARNING Makesure the instrument is disconnected from the power line and othe
96. ion 3 Routine Maintenance Power line eene daa 3 3 4 Troubleshooting Power supply components rr Display board ae daa Power supply checks sr Digital circuitry checks ra DEY signal switching eerren and FREQ signal switching rra Q2 signal switching signal switching rru Q2 Q4 reference switching rr DCA signal Switching eerte Erreza I Galdea TEI KA MISA DCV signal multiplexing and gain rro ACV and ACA signal multiplexing and gain DCA signal multiplexing and gain rro Q2 signal multiplexing and O4 signal multiplexing and gain rru Switching device locations 5 Disassembly Input terminal wire colors rr Power module wire colors 6 Replaceable Parts DMM mother board parts list Display board parts list sr Distortion DSP board parts list Mechanical parts list rra B Calibration Reference Remote calibration command summary DC calibration commands 1 AC calibration commands 2 Distortion and function generator calibration commands Calibration error summary rra Performance Venfication 1 2 Performance Verification Introduction Use the procedures in this section to verify that Model 2015 Multimeter accur
97. ion step 0 9 to 1 1 STEP1 CALibration PRO Tected D C STEP1 Purpose Format To perform front terminal short circuit calibration cal prot dc stepl Parameter None Description 5 performs the short circuit calibration step in the comprehensive cal ibration 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 B 10 Calibration Reference STEP2 CALibration PRO Tected D C STEP2 Purpose Format Parameter Description Example STEP3 To perform front terminal open circuit calibration cal prot dc step2 None STEP2 performs the open circuit calibration step in the comprehensive cal ibration procedure Disconnect all cables and accessories from the input jacks before sending this command CAL PROT DC STEP2 Perform open circuit calibration CALibration PRO Tected D C STEP3 Purpose Format Parameter Description Example STEPA To program the 10V comprehensive calibration step cal prot dc step3 Cal voltage Cal voltage 9 to 11 V STEP3 programs the 10V DC comprehensive calibration step The allow able range of the calibration voltage parameter is from 9 to 11 but 10 is rec ommended for best results CAL PROT DC STEP3 10 Program 10V step CALibration PRO Tected D C STEP4 Purpose Format Parameter
98. leshooting 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 P1005 PIN 5 5V 5 Digital 5V supply 3 P1005 PIN 9 37 5 Display 37V supply 4 U401 PIN 1 Goes low briefly on power up Microcontroller RESET then goes high 5 U401 PIN43 4MHz square wave Controller 4MHz clock 6 U401 PIN 32 Pulse train every Imsec Control from main processor 7 U401 PIN 33 Brief pulse train when front Key down data sent to main panel key is pressed processor Troubleshooting 4 19 Power supply checks Power supply problems can be checked out 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 Line power Plugged into live receptacle Check for correct power up power on sequence 4 U144 pin 2 5V 5 5VD referenced to Common D 5 0101 pin 7 37V 5 37V referenced to Common D 6 U125 pin 3 15V 5 15 referenced to Common 7 U119 pin 3 15V 5 15V referenced
99. lete function generator calibration CAL PROT FGEN STEP1 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 97 and 3 14 98 respectively CAL PROT DATE 1997 12 15 CAL PROT NDUE 1998 3 14 Saving calibration constants After completing the calibration procedure send the following command to save the new cal ibration constants CAL PROT SAVE NOTE Calibration constants will not be saved unless the SAVE command is sent Locking out calibration After saving calibration send the following command to lock out calibration CAL PROT LOCK 2 24 Calibration Manufacturing calibration The manufacturing 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 calibration 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 15 summarizes the test equipment required for the manufacturing calibration steps In addition you will need the calibrator and signal generator see Table 2 1 to complete the comprehensive calibration steps Tabl
100. low thermal connections when testing the 100mV and 1V ranges to avoid errors caused by noise or thermal effects Connect the shield to the calibrator s output LO terminal Figure 1 1 Connections for DC volts verification Input HI DC Voltage Calibrator Model 2015 KEITHLEY Output HI S HZ EA O LO Note Use shielded low thermal cables for 100mV and 1V ranges 2 Performance Verification 1 9 2 Select the DC volts function by pressing the DCV key and set the Model 2015 to the 100mV range Select the SLOW integration rate with the RATE key 3 Set the calibrator output to 0 00000mV DC and allow the reading to settle 4 Enable the Model 2015 REL mode Leave REL enabled for the remainder of the DC volts verification tests 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 Range Applied DC voltage Reading limits 1 year 18 28 C 100mV 100 0000mV 99 9915 to 100 0085mV IV 1 000000V 0 999963 to 1 000037V 10V 10 00000V 9 99965 to 10 00035V 100V 100 0000V 99 9949 to 100 0051V 1000V 1000 000V 999 949 to 1000 051V Source positive and negativ
101. lter U309 U310 1 Analog 1 ees sss I Circuit L gt ADC Converter va Distortion Digital Circuitry See Figure 4 3 See Figure 4 4 ADC Clock Generator U325 Amplifier filter The buffered and scaled AC waveform from the analog circuitry Figure 4 3 is fed to U309 and U310 U309 and U310 form an amplifier antialiasing filter and DC shifting circuit to con dition the AC waveform for the distortion measurement ADC converter EEPROM U315 ADC converter The distortion measurement circuitry uses a separate ADC converter from the rest of the DMM measurements see U165 in Figure 4 3 This ADC is a high speed high resolution low distortion sigma delta type The ADC digital output is sent to the DSP through opto isolators shown in Figure 4 5 ADC clock Y301 is a fixed frequency clock that forms the input to U325 an adjustable frequency clock generator The output of this generator clocks the ADC setting the acquisition rate The clock generator frequency is set by the microprocessor and is communicated through U3 14 the FPGA The FPGA U314 is configured by U315 an EEPROM upon power up 4 16 Troubleshooting Sine generator circuitry Refer to Figure 4 6 for the following discussion on the sine generator circuitry Figure 4 6 Sine generator circuitry block diagram Inv Sine Pulse Out Inv Sine pulse Attenuator U303 U334 besi _ EEPROM 50 600 Ohm k
102. ly 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 installed in the M odel 2015 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 Use only grounded tip solder irons Once the device is installed in the PC board it is normally adequately protected and you can handle the boards normally Disassembly 5 5 Assembly drawings Use the following assembly drawings to assist you as you disassemble and re assemble the Model 2015 Also refer to these drawings for information about the Keithley part numbers of most mechanical parts in the unit T
103. manual undergoes sub sequent updates Addenda which are released between Revisions contain important change in formation that the user should incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each new Revision includes revised copy of this print history page Revision A Document Number 2015 902 01 rra May 1998 Revision B Document Number 2015 902 01 nnn July 1998 Revision C Document Number 2015 902 01 asas June 1999 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 instrumen tation 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
104. mple 3 Program 1kQ step To program the 10k 4 wire comprehensive calibration step cal prot dc step7 Cal resistance Cal resistance 9E3 to 11E3 O STEP7 programs the 10kQ 4 wire resistance comprehensive calibration step The allowable range of the calibration resistance parameter is from 9E3 to 11E3 but 10E3 is recommended for best results CAL PROT DC ST EP7 10E 3 Program 10kQ step B 12 Calibration Reference STEPS CALibration PRO Tected D C STEP8 Purpose To program the 100k 4 wire comprehensive calibration step Format cal prot dc step8 Cal resistance Parameter Cal resistance 90E3 to 110E3 Q 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 100E3 is recommended for best results Example CAL PROT DC STEP8 100E3 Program 100kQ step STEP9 CALibration PRO Tected D C STEP9 Purpose To program the 1MQ comprehensive calibration step Format cal prot dc step9 Cal resistance Parameter Cal resistance 900E3 to 1 1E6 Q Description STEP programs the 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 1M9 calibration step ST
105. must ensure that users are prevented access and or insulated from every connection point In some cases connections 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 multimeter measuring circuits e g Keithley Models 175A 199 2000 2001 2002 and 2010 are Installation Category II All other instruments signal terminals are Installation Category I and must not be connected to mains Do not connect switching cards directly to unlimited power circuits They are intended to be used with imped ance 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 receptacle Inspect the connecting cables test leads and jumpers for possible wear cracks or breaks before each use For maximum safety do not touch the product test cables or any other instruments while power is applied to the circuit under test ALWAYS remove power from the entire test system and discharge any capacitors before connecting or disconnecting cabl
106. n 0 5mV 500 and 6000 or 1mV rms 2 Amplitude Accuracy 2 0 of setting 2mV 4 Amplitude Flatness 0 1dB 5 Output Impedance Same as Source Output setting THD 64dB Noise 100pV rms DC Offset Voltage 1 1mV typ 13mV max A 4 Specifications INV PULSE OUTPUT PULSE MODE Frequency Same as source output Duty Cycle 45 3 Output Impedance Same output impedance as the source output Amplitude LIN 0 07V to 4 9V 0 12V pulse open circuit 3 0 0V 0 05V to 3 3V 0 08V pulse 1000 load Overshoot 1 0 maximum pulse open circuit 0 2V maximum with 1000 load pulse open circuit Undershoot LIN maximum pulse open circuit 0 45V maximum with 100Q load pulse open circuit Notes 1 1 year 23 C 5 2 Measured at Voy with gain 100 amplifier and 2 pole 50kHz low pass filter Inv Pulse in sinewave mode HI Z output impedance and load 3 With HI Z output impedance and 1m 50Q coaxial cable 4 HI Z output impedance no load 5 4V output 6 THD measurement includes harmonics 2 through 5 1V rms output HI Z no load DC CHARACTERISTICS CONDITIONS MED 1 PLC 1 or SLOW 10 PLC ACCURACY ppm of reading ppm of range or MED 1 PLC with filter of 10 ppm parts per million e g 10ppm 0 001 TEMPERATURE TEST CURRENT COEFFICIENT OR BURDEN INPUT 24 HOUR 90 DAY 1YEAR 0 18 C amp FUNCTION RANGE RESOLUTION VOLTAGE RESISTANCE 23 C 1 23 5 23
107. n in this section is intended only for qualified service person nel Do not perform these procedures unless you are qualified to do so Some of these procedures may expose you to hazardous voltages that could cause personal injury or death U se caution when working with hazardous voltages Troubleshooting 4 3 Repair considerations Before making any repairs to the Model 2015 be sure to read the following considerations CAUTION ThePC 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 fac tory for repairs or limit repairs to the PC board replacement level Without proper equipment and training you could damage a PC board beyond repair Repairs will require various degrees of disassembly However it is recommended that the Front Panel Tests be performed prior to any disassembly The disassembly instruc tions for the Model 2015 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 2015 These static sensitive devices require special handling as explained in Section 5 Whene
108. nction generator to output a RMS sine wave at a frequency of 844Hz Press ENTER to complete the 844Hz calibration step Calibration 2 15 Figure 2 5 Connections for distortion calibration BNC to D ual Banana Plug Adapter Low Distortion Function Generator Model 2015 KEITHLEY Coaxial Cable Table 2 8 Distortion and function generator calibration summary Calibration step Calibration signal or connections Distortion 1V at 137Hz 1V RMS 137Hz sine wave Distortion 1V at 844Hz 1V RMS 844Hz sine wave Function generator SOURCE OUTPUT to INPUT Function generator calibration 1 Following distortion calibration the Model 2015 will prompt you to connect the SOURCE OUTPUT jack to the INPUT jacks INPUT FGEN 2 Connect the rear panel SOURCE OUTPUT jack to the front panel INPUT jacks See Figure 2 6 3 Press the ENTER key to complete function generator calibration Figure 2 6 Connections for function generator calibration Model 2015 Connect IN PUT jacks to KEITHLEY rear panel SOURCE OUTPUT 2 16 Calibration 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 2015 will prompt you to enter the calibration date and the calibration due date Set these dates as follows 1 At the CAL DATE mm dd yy prompt use the left a
109. nd lines IEEE 488 REN line IEEE 488 IFC line ADRXB ADTX ADCLK ADTS Analog signal switching states Troubleshooting 4 21 Tables 4 5 through 4 11 provide switching states of the various relays FETs and analog 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 0102 0114 0136 0109 101 0113 0105 0104 0108 0121 100mV ON OFF OFF OFF SET OFF OFF ON OFF ON 1V ON ON OFF OFF OFF SET OFF OFF ON OFF ON 10V ON ON OFF OFF OFF SET OFF OFF ON OFF ON 100V OFF OFF ON ON OFF SET OFF OFF OFF ON ON 1000V OFF OFF ON ON OFF SET OFF OFF OFF ON ON K101 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Table 4 6 ACV and FREQ signal switching 0103 0103 U105 0105 0103 0103 0105 Ulll Range 0101 0102 K101 K102 pin8 9 9 8 16 1 1 16 100mV JON ON RESET RESET ON ON OFF OFF ON OFF 1V ON ON RESET RESET ON ON OFF OEE ON OFF OEE ORE 10V ON ON RESET SET OEE OEE ON OFF OFF ON ON OFF 100V ON RESET SET OEE OEE ON OFF OFF OEE ORE 750 ON ON RESETISET OFF OEE ON ON OFF OFF OEE OEE K101 and K102 reset states K101 and K102 set states Pin 8 switched to Pin 9 Pin 3 switched to Pin 2 Pin 8 switched to P
110. nd 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 mm dd yy 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 current calibration procedure will not be saved unless you choose the YES option Previous calibration constants will be retained if you select NO Remote calibration Follow the steps in this section to perform comprehensive procedures via remote See Appen dix B for a detailed list and description of remote calibration commands When sending calibration commands be sure that the Model 2015 completes each step before sending the next command You can do so either by observing the front panel CALIBRATING 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 2015 via remote include Preparing the Model 2015 for calibration Front panel short and open calibration DC volts calibration Resistance calibration DC current calibration AC volts calibration
111. ne wave 3 Select the Model 2015 frequency function by pressing the FREQ key 4 Verify that the Model 2015 frequency reading is between 0 9999kHz 1 0001kHz Figure 1 7 Connections for frequency verification EEE Frequency Synthesizer Banana Plug Adapter Model 2015 Main Function Output 50Q BNC Coaxial Cable 1 18 Performance Verification Verifying total harmonic distortion Follow the steps below to verify the Model 2015 total harmonic distortion function 1 Figure 1 8 Connect the low distortion function generator to the Model 2015 INPUT jacks See Figure 1 8 Connections for total harmonic distortion verification Model 2015 BNC to D ual Banana Plug Adapter Low Distortion Function Generator KEITHLEY Dns Coaxial Cable Set the function generator to output a 1kHz 0 95V RMS sine wave with an unbalanced high impedance output Using the MEAS key set the following operating modes TYPE THD FREQ AUTO UPR HARM 10 UNITS PERC SFIL NONE Select the Model 2015 THD function by pressing SHIFT then THD Use the down RANGE key to select the 1V range Verify that the Model 2015 THD reading is lt 0 004 Performance Verification 1 19 Verifying function generator amplitude Follow the steps below to verify Model 2015 function generator amplitude 1 Connect the rear panel SOURCE OUTPUT jack to the front panel
112. ner directly to the instrument or allow liquids to enter or spill on the instrument Products 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 contaminated and op eration is affected the board should be returned to the factory for proper cleaning servicing Rev 2 99 Table of Contents 1 Performance Verification Introduction e Verification test requirements Environmental conditions Warm up period n cierre rte ripe Lane POWER ded E Recommended test equipment Verification DUTE err ret eterne dnce rira tarrekin Example reading limit calculation L Calculating resistance reading limits Restoring factory defaults rra Performing the verification test procedures ETE AMEN Test considerations PP p Verifying DC voltage ice either t Verifying AC Voltage iss nette tue Dore Verifying DC current Verifying AC current raa Verifying resistance ra Verifying temperature rra Vertying ME QUENCY ras rert ia iA Verifying total harmonic distortion rra Verifying function generator amplitude
113. on calibration aa de Function generator calibration Programming calibration dates Saving calibration constants rd Locking out calibration di Manufacturing calibration sb Recommended test equipment rrak Unlocking manufacturing calibration 1 Measuring synthesizer signal amplitude Front panel manufacturing calibration 1 Remote manufacturing calibration rra TOGO z u M Setting the line voltage and replacing the line fuse Replacing the AMPS fuse rru Introduction ient metro re e ERE Ce ER RR edid Repair consid rations anaren E aortan Power on self test ragarri tarraren natorren Front panel tests lea M DISP fest Principles Of operation rru Power SUpply AEA Display board sires aee eet eerte theses Digital CUCU GOGOE D Distortion digital circuitry rra Distortion analog circuitry rra Sine generator cIEculty arrengan FroubleshootUng tuetara gean Display board checks rrak USA SATAN Aaa aA Digital circuitry checks rrura Analog signal switching states 5 Disassembly Int oduction M Handling and cleaning Handling PC boards Solder repairs ere reete Ree bei eras Static sensitive devic
114. ond to any remote programming commands while the ABORT CAL message is displayed Front panel calibration Follow the steps in the following paragraphs for comprehensive DC only AC only distor tion and function generator calibration procedures The procedures for front panel calibration include Preparing the Model 2015 for calibration Front panel short and open calibration DC voltage calibration Resistance calibration DC current calibration AC voltage calibration AC current calibration Distortion calibration Function generator calibration Setting calibration dates Preparing the Model 2015 for calibration 1 Turn on the Model 2015 and allow it to warm up for at least one hour before performing calibration procedure Select the DCV function and choose SLOW as the RATE integration time 10 PLC Start the calibration process as follows A Access the calibration menu by pressing SHIFT then CAL B Usethe up and down range keys to scroll through the available calibration menu items until the unit displays RUN then press ENTER C Atthe prompt enter the calibration code The default code is 002015 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 D Choose N at the prompt to proceed without changing the code then press ENTER 2 8 Calibration 4 Choose w
115. or 4 wire resistance with external sense on 3 Select the Model 2015 4 wire resistance function by pressing the O4 key then choose the SLOW integration rate with the RATE key Set the Model 2015 for the 100Q range and make sure the FILTER is on 5 Recalculate reading limits based on actual calibrator resistance values Performance Verification 1 15 Figure 1 6 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 2015 INPUT and SENSE jacks to the calibrator as shown in Figure 1 6 8 Disable external sense on the calibrator 9 Set the Model 2015 for the 100 range 10 Source a nominal 100MQ resistance value and verify that the reading is within cal culated limits for the 100 range Connections for resistance verification 100M Q range KEITHLEY Sense HI Resistance Calibrator Model 2015 Ji Table 1 6 990 99 ETE O Ot e Note Use shielded cables to minimize noise Disable calibrator external sense mode Limits for resistance verification Q Range 100Q 1kQ 10kQ 100kQ IMQ 10MQ 100MQ Nominal Nominal reading limits resistance 1 year 18 C
116. panel calibrationp 7 Front panel calibration codd 2 5 Front panel disassembly Front panel manufacturing calibratio Front panel short and open calibration 2 8 Front panel tests 4 5 Function generator calibratio 2 23 General program instruction C 3 Generating an SRO on calibration complete B 22 Generating an SRQ on erro 20 Handling and cleaning 5 3 Handling PC boards 5 3 Input terminal wire connection 5 9 Instrument reassembl y 5 9 Introduction 1 2 2 2 3 2 252 62 8 2 KEY 4 5 Locking out calibration 2 23 Main CPU firmware replacement 5 11 Manufacturing calibratio 3B 17 Manufacturing calibration command Measuring synthesizer signal amplitude 2 24 Miscellaneous calibration commands pura Optimizing measurement accuracy A 13 Optimizing measurement speed A 14 Ordering infomatior 52 Parts tistq6 2 Performance verific ation 1 1 Performing the verification test prs Power module wire connections 5 9 Power supply 4 6 Power supply checks 4 19 Power on self test Preparing the Model 2015 for calibration Principles of operation Programming calibration dated 2 23 Recommended equipmen pal Recommended test equipment Remote calibration Remote calibration codd 2 5 Remote error reporting B 18 Remote manufacturing calibratior Removing power components 5 8 Repair considerat ons Replaceable parts Replacing the E Resist
117. pts on the screen to perform calibration Program 1 Model 2015 calibration program Model 2015 calibration program Rev 1 0 4 30 98 OPEN FOR OUTPUT AS 1 Open IEEE 488 output path OPEN IEEE FOR INPUT AS 2 Open IEEE 488 input path PRINT 1 INTERM CRLE Set input terminator PRINT 1 OUTTERM LF Set output terminator PRINT 1 REMOTE 4 16 Put 2015 5700A in remote PRINT 1 CLEAR Send DCL PRINT 41 OUTPUT 16 SYST PRES CLS Initialize 2015 PRINT 41 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 2015 partial command header CLS Clear CRT PRINT Model 2015 Multimeter Comprehensive Calibration Program PRINT 1 OUTPUT 16 CAL PROT CODE KI002015 Send 002015 cal code PRINT 41 OUTPUT 16 CAL PROT INIT Initiate calibration GOSUB ErrCheck RESTORE CmdList FOR I 1 28 Loop for all cal points READ Msg Cmd Read message cal strings SELECT CASE I Select cal sequence CASE 1 2 26 27 28 PRINT Msg GOSUB KeyCheck C 4 Calibration Program CASE 3 PRINT Connect calibrator to INPUT and SE
118. r equipment before performing the following procedure Remove the cover from the instrument as explained in Case cover removal 2 The resistors used to select the trigger link lines are located next to the Trigger Link connector as shown in Figure 5 1 The resistors are actually solder beads that bridge PC board pads If the factory default lines are selected the solder beads will be located at R270 line 2 EXT TRIG and R267 line 1 VMC 3 change a trigger link line e Use a soldering iron and solder sucker to remove the appropriate solder bead e Using a solder with OA based flux apply a solder bead to the appropriate resistor location Replace the cover on the instrument Figure 5 1 Trigger link line connections DMM Board View from top Rear Panel Trigger Link Lines Solder Bead Line 1 R267 R270 Line 2 EXT TRIG R270 R269 D 0 Line 3 VMC R266 R268 H D Trigger Line 4 EXT TRIG R268 Link Line 5 VMC R265 R270 EN Connector Line 6 EXT TRIG R269 R269 O I R268 OO Factory Default Configured Disassembly 5 11 Main CPU firmware replacement Changing the firmware may be necessary as upgrades become available The firmware revi sion levels for the main and front panel CPUs are displayed during the power on sequence The main firmware revision level is displayed on the left the front panel firmware revision level is displayed on the right For example
119. ram AC step 14 Program AC step 15 To perform rear terminal short circuit calibration cal prot dc stepO None SOT EPO performs the rear short circuit calibration step in the manufacturing calibration procedure Connect a low thermal short Model 8610 to the rear panel input jacks and select the rear inputs before sending this command CAL PROT DC STEPO Perform rear short circuit calibration B 18 Calibration Reference Remote error reporting Methods to detect and determine the nature of calibration errors are discussed below Error summary Table B 5 summarizes Model 2015 calibration errors Table B 5 Calibration error summary Error number and description 400 10 vdc zero error 401 100 vdc zero error 402 10 vdc full scale error 403 10 vdc full scale error 404 100 vdc full scale error 405 100 vdc full scale error 406 1k 2 w zero error 407 10k 2 w zero error 408 100k 2 w zero error 409 10M 2 w zero error 410 10M 2 w full scale error 411 10M 2 w open error 412 1k 4 w zero error 413 10k 4 w zero error 414 100k 4 w zero error 415 10M 4 w sense lo zero error 416 1k 4 w full scale error 417 10k 4 w full scale error 418 100k 4 w full scale error 419 1M 4 w full scale error 420 10M 4 w full scale error 421 10m ade zero error 422 100m ade zero error 423 10m adc full scale error 424 100m
120. ration complete has been detected clear OPC status using one of two methods 1 Use the ESR query then read the response to clear the standard event status regis ter or 2 send the CLS command to clear the status registers Note that sending CLS will also clear the error queue and operation complete status B 22 Calibration Reference Generating an SRQ on calibration complete An 488 bus SRQ service request can be used to detect operation complete instead of repeatedly polling the Model 2015 To use this method send both ESE 1 and SRE 32 to the instrument then include the 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 2015 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 IBM PC AT or compatible computer Keithley KPC 488 2 KPS 488 2 or KPC 488 2AT or CEC PC 488 IEEE 488 interface for the computer Two shielded IEEE 488 connecting cables Keithley Model 7007 Software requirements In order to use the calibration program you will need the following software Microsoft QB
121. red DC voltage DC current and resistance Select 3 digits 0 01 PLC filter OFF fixed range AC voltage and AC current Select 3 digits 0 01 PLC filter OFF fixed range Temperature Select 3 digits 0 01 PLC filter OFF For all functions turn off the display and autozero and set the trigger delay to zero Use the SAMPle COUNt and READ bus commands Distortion Select frequency ACQUIRE or SET filter OFF distortion shaping filter NONE autor ange OFF Calibration Reference B 2 Calibration Reference Introduction This appendix contains detailed information about the various Model 2015 remote calibration commands Section 2 of this manual covers detailed calibration procedures For information about additional commands to control other instrument functions refer to the Model 2015 User s Manual Command summary Calibration Reference B 3 Table B 1 summarizes Model 2015 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 CODE up to 8 char string COUNt INITiate LOCK LOCK SAVE DATE year month day DATE NDUE year month day NDUE Dc STEPO STEPI STEP2 5 lt NRf gt STEPA lt NRf gt 5 5 lt NRf gt 5 6 lt NRf gt STEP7 lt NRf gt 5 8 lt
122. reference impedance of 500 assume an applied signal 0 998815V The relationship between voltage and dBm is as follows dBm 10 log mW From the previous example on calculating DC characteristics accuracy it can be shown that 0 998815V has an uncertainty of 36 964451 or 0 998778V to 0 998852V using one year specifications of the 1 VDC range Expressing 0 998778V as dBm 0 998778 2 500 imw 13 00032dBm dBm 10 log and expressing 0 998852V as dBm 0 998852 V 2 500 dBm 10 log imw 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 per tinent specifications ranges and reference impedances Specifications 11 Calculating dB characteristics accuracy The relationship between voltage and dB is as follows Vin REF dB 20 log As an example of how to calculate the actual readings limits for dB with a user defined of 10V you must calculate the voltage accuracy and apply it to above equation To calculate a 60dB measurement assume 1OmVRMS for a Vgge of 10V Using the 100mV range one year 10Hz 20kHz frequency band and SLOW rate the voltage limits are as fol lows Accuracy 0 06 of reading 0 03 of range 0 006 x 10mV 0 0003 x 100mV 6uV 30u V 36u V Thus the actual reading accuracy is 10 36uV or 10 036mV to 9 964mV Applying the voltag
123. rmer 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 2 Remove the DMM board Unplug the transformer wires that attach to the DSP board For TR 332 unplug J1018 and J1020 For TR 328 unplug 1019 and J1031 Remove the two nuts that secure the transformer to the bottom of the chassis Pull the black ground wire off the threaded stud and remove the power transformer from the chassis Power module removal Perform the following steps to remove the power module 1 Remove the DMM board Unplug connector J1021 from the DSP board 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 9 Instrument reassembly Reassemble the instrument by reversing the previous disassembly procedures Make sure that all parts are properly seated and secured and that all connections are properly made To ensure proper operation replace and securely fasten the shield WARNING ensure continued protection against electrical shock verify that power line ground green and yellow wire attached to the power module and the power transformer ground black wire are connected to the chassis W hen install
124. rs any calibration error will be reported in the bus error queue You can read this queue by using the SYST ERR query The Model 2015 will respond with the appropriate error message 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 Calibration Reference B 21 D etecting 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 O PC 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 r
125. s Introduction This section contains replacement parts information and component layout drawings for the Model 2015 Parts lists The electrical parts lists for the Model 2015 are shown in Tables 6 1 to 6 4 For part numbers to the various mechanical parts and assemblies use the Miscellaneous parts list and the assem bly 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 2015 Instrument serial number Part description Component designation if applicable 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 1 800 552 1115 for a Return Material Authorization RMA number Complete the service form at the back of this manual and include it with the instrument Carefully pack the instrument in the original packing carton Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label Component layouts The following component layouts are provided in the following pages Motherboard DMM board 2015 100 Display board 2010 110 e THD DSP board 2015 130 Replaceable P
126. s 6 13 Table 6 3 Distortion DSP board parts list continued K eithley Circuit designation Description part no U315 PROGRAMMED ROM 2015 806 U316 321 324 IC OPTOCOUPLER 2601 239 U326 PROGRAMMED ROM 2015 807 U329 LARGE SCALE IC SMT LSI 217 U330 PROGRAMMED ROM 2015 805 U331 5A POSITIVE FIXED REGULATOR IC 1202 U332 345 IC SUPPLY VOLT SUPERVISOR TL7705A 860 U334 INTEGRATED CIRCUIT SMT 1245 336 338 CMOS ANAL SWITCH DG444DY IC 866 U346 PROGRAMMED ROM 2015 808 U347 IC VOLT COMPARATOR LM311M IC 776 U348 INTEGRATED CIRCUIT 96 0349 15V VOLTAGE REG 7915 IC 174 U350 IC 5V REGULATOR 500mA 7805 93 W301 304 JUMPER J 24 1 Y301 303 CRYSTAL SMT CR 56 1 Order current firmware revision for example 01 6 14 Replaceable Parts Table 6 4 Mechanical parts list Qty Description K eithley part no 4 BANANA JACK PUSH IN BLACK BJ 14 0 4 BANANA JACK PUSH IN RED BJ 14 2 1 BEZEL REAR 428 303D 4 CHOKE CH 58 1A 1 CONTACT CURRENT INPUT 2001 313C 1 COVER 2000 307C 1 DISPLAY LENS 2015 311A 2 FOOT 428 319A 2 FOOT EXTRUDED FE 22A 2 FOOT RUBBER FE 6 1 FRONT PANEL OVERLAY 2000 303B 1 FRONT REAR SWITCH ROD 2001 322A 1 FUSE HOLDER FH 35 1 1 FUSE 5A 250V FU 71 1 FUSE 3A 250 FU 99 1 1 HANDLE 428 329F 2 HOLDER FERRITE 2001 367A 1 JACK CURRENT INPUT 2001 312D 1 JACK CURRENT INPUT V 2001 312D 1 LINE CORD CO 7 1 MOTHERBOARD SHIELD 2000 306B 1 MOUNTING
127. s 50Hz 400Hz The frequency is automatically determined at power up For signal levels gt 500V add 0 02ppm V uncertainty for the portion exceeding 500V Add 120ms for ohms Must have 10 matching of lead resistance in Input HI and LO For line frequency 0 1 For 1kQ unbalance in LO lead Relative to calibration accuracy 0 udo WD pe pa eee m ROIG Specifications are for 4 wire ohms or 2 wire ohms with REL function A 6 Specifications TRUE RMS AC VOLTAGE AND CURRENT CHARACTERISTICS ACCURACY of reading of range 23 C 5 C VOLTAGE CALIBRATION 3 Hz 10 Hz 20 kHz 50 kHz 100 kHz RANGE RESOLUTION CYCLE 10 Hz 20 kHz 50 kHz 100 kHz 300 kHz 100 0000 mV 0 1 1 000000 V 1 0 pV 90 Days 0 35 0 03 0 05 0 03 0 11 0 05 0 60 0 08 4 05 10 00000 V 10 pV 100 0000 V 100 pV 1 Year 0 35 0 03 0 06 0 03 0 12 0 05 0 60 0 08 4 05 750 000 V 1mV TEMPERATURE COBEPICIBNTA 0 035 0 003 0 005 0 003 0 006 0 005 0 010 006 0 03 0 01 CURRENT CALIBRATION 3Hz 10 Hz RANGE RESOLUTION CYCLE 10 Hz 5kHz 1 000000 A I pA 90 Day 1 Year 0 30 0 04 0 10 0 04 3 00000 A 10 pA 90 Day 1 Year 0 35 0 06 0 15 0 06 TEMPERATURE COEEFICIBNTA 0 035 0 006 0 015 0 006 HIGH CREST FACTOR ADDITIONAL ERROR of reading 7 CREST FACTOR 1 2 2 3 3 4 4 5 ADDITIONAL ERROR 0 05 0 15 0 30 0 40 AC OPERATING CHARACTERISTICS FUNCTION DIGITS READINGS s RATE BANDWIDTH ACV all ranges and 6153 2s rea
128. s as shown in Figure 2 4 Calibration 2 Perform the calibration steps summarized in Table 2 12 For each step e bei 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 2015 completes each step before continuing Table 2 12 AC voltage calibration programming steps Calibration step 10mV AC at 1kHz 100mV AC at 1kHz 100mV AC at 50kHz 1VAC at 1kHz 1VAC at 50kHz 10VAC at 1kHz 10VAC at 50kHz 100VAC at 1kHz 100VAC at 50kHz TOOVAC at 1kHz Calibrator voltage frequency 10 00000mV 1kHz 100 0000mV 1kHZ 100 0000mV 50kHz 1 000000V 1kHz 1 000000V 50kHz 10 00000V 1kHz 10 00000 50kHz 100 0000V 1kHz 100 0000V 50kHz 700 000V 1kHz Calibration command CAL PROT AC STEP1 CAL PROT AC STEP2 CAL PROT AC STEP3 CAL PROT AC STEP4 CAL PROT AC STEP5 CAL PROT AC STEP6 CAL PROT AC STEP7 CAL PROT AC STEPS CAL PROT AC STEP9 CAL PROT AC STEP10 2 22 Calibration AC current calibration Follow these steps for AC current calibration 1 Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2015 as shown in Figure 2 3 2 Perform the calibration steps summarized in Table 2 13 For each step bei the calibrator to the indicated current and frequency and make sure the unit is in operate You must use t
129. t to the unit before sending any other comprehensive or manufacturing calibration command The default calibration code is KI002015 NOTES The CODE command should be sent only once before performing either the compre hensive 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 CAL PROT CODE KI002015 Send default code of KI002015 COUNT CALibration PRO Tected CO U Nt Purpose To determine how many times the Model 2015 has been calibrated Format cal prot coun Response n Calibration count Description The COUNt command allows you to determine how many times the Model 2015 has been calibrated NOTE Use the COUNt command to help you monitor for unauthorized calibration procedures Example CAL PROT COUN Request calibration count B 6 Calibration Reference INIT CALibration PRO Tected IN ITiate Purpose To initiate comprehensive and factory calibration procedures Format cal prot ini Parameter None E Description The INIT command enables Model 2015 calibration when performing these procedures over the bus This command must be sent to the unit after sending the CODI command E command but before sending any other calibration NOTE The INIT command should be sent only once before performing either DC AC or factory c
130. tart short circuit calibration While the unit is calibrating it will display CALIBRATING 3 When the unit is done calibrating it will display the following prompt OPEN CIRCUIT 4 Remove the calibration short and press ENTER During this phase the CALIBRAT ING message will be displayed DC volts calibration After the front panel short and open procedure the unit will prompt you for the first DC volt age 10V Do the following 1 Connect the calibrator to the Model 2015 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 HI DC Voltage Calibrator Model 2015 KEITHLEY i A N Ol roo a yA V CX C3 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
131. tep 13 2A AC at 1kHz calibration step O DN bea ba N Description The AC STEP command programs the 13 individual AC calibration steps lt n gt 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 B 16 Calibration Reference Distortion and function generator calibration commands Table B 4 summarizes distortion and function generator calibration commands Table B 4 Distortion and function generator calibration commands Command Description CALibration PROTected DIST Distortion calibration commands STEPI 1V RMS at 137Hz step STEP2 1V RMS at 844Hz step FGEN Function generator calibration command STEPI DIST STEP1 CALibration PRO Tected D IST STEP1 DIST STEP2 CALibration PRO Tected D IST STEP2 Purpose To perform distortion calibration steps Format cal prot dist stepl 1V RMS at 137Hz step cal prot dist step2 1V RMS at 844Hz step Parameters None Description DIST STEPI and DIST STEP2 perform distortion calibration steps Apply the 1V RMS 137Hz or 844Hz calibration signal to the INPUT jacks before sending these commands Example CAL PROT DIST STEP1 Perform 137Hz step FG EN 5 1 CALibration PRO Tected FG EN STEP1 Purpose To perform function generator cal
132. that the front panel input jacks are selected with the INPUTS switch Do not use autoranging for any verification tests because autorange hysteresis may cause the Model 2015 to be on an incorrect range For each test signal you must manually set the correct range for the Model 2015 using the range keys Make sure the calibrator is in operate before you verify each measurement Always let the source signal settle before taking a reading Do not connect test equipment to the Model 2015 through a scanner or other switching equipment WARNING common mode voltage voltage between INPUT LO and chassis ground is 500V peak Exceeding this value may cause a breakdown in insulation creating a shock hazard Some of the procedures in this sec tion may expose you to dangerous voltages U se standard safety precau tions when such dangerous voltages are encountered to avoid personal injury caused by electric shock 1 8 Performance Verification Verifying DC voltage Check DC voltage accuracy by applying accurate voltages from the DC voltage calibrator to the Model 2015 INPUT jacks and verifying that the displayed readings fall within specified limits CAUTION Do not exceed 1100V peak between INPUT HI and INPUT LO because instrument damage may occur Follow these steps to verify DC voltage accuracy 1 Connect the Model 2015 HI and LO INPUT jacks to the DC voltage calibrator as shown in Figure 1 1 NOTE Use shielded
133. 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 1 6 Performance Verification 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 press ing ENTER 3 Factory defaults will be set as follows Speed medium Filter 10 readings Performance Verification 1 7 Performing the verification test procedures Test summary Verification test procedures include DC volts AC volts DC current AC current Resistance Temperature Frequency Total harmonic distortion Function generator amplitude If the Model 2015 is not within specifications and not under warranty see the calibration pro cedures in Section 2 Test considerations When performing the verification procedures Be sure to restore factory defaults as outlined above After restoring factory defaults and selecting the measuring function select the SLOW integration rate with the RATE key Make sure that the equipment is properly warmed up and connected to the front panel input jacks Also make sure
134. to Common A 8 U124 pin 3 5V 5 5VRL referenced to Common A 9 U331 pin 2 5V 3 5VD2 referenced to Common D 10 U348 pin 3 15V 5 15VA referenced to Common F 11 U349 pin 3 15V 5 15VA referenced to Common F 12 U350 pin 3 5V 5 5VA referenced to Common F 4 20 Troubleshooting Digital circuitry checks Digital circuit problems can be checked out using Table 4 4 Table 4 4 Digital circuitry checks Step Item component Required condition Remarks 1 Power on test 2 0152 pin 14 3 U152 pin 28 4 U135 pin 48 5 U135 lines A1 A23 6 0135 lines D1 D15 7 0135 44 8 159 13 9 0159 14 10 0158 34 42 11 0158 26 31 12 0158 pin 24 13 0158 25 14 0135 84 15 0135 pin 91 16 U135 pin 90 17 U135 pin 89 RAM OK ROM OK Digital common 45V Low on power up then goes high Check for stuck bits Check for stuck bits 14 7456MHz Pulse train during RS 232 I O Pulse train during RS 232 I O Pulse train during IEEE 488 I O Pulses during IEEE 488 I O Low with remote enabled Low during interface clear Pulse train Pulse train Pulse train Pulse train Verify that RAM and ROM are functional All signals referenced to digital common Digital logic supply MPU RESET line MPU address bus MPU data bus MPU clock RS 232 RX line RS 232 TX line IEEE 488 data bus IEEE 488 comma
135. uery 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 Examples CAL PROT NDUE 1998 12 16 Send due date 12 16 98 CAL PROT NDUE Request due date 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 Calibration Reference B 9 Table B 2 DC calibration commands Command Description Parameter limits CALibration PROTected DC STEPI Front terminal short circuit STEP2 Open circuit 5 lt NRf gt 10V DC calibration step 9 to 11 5 4 lt NRf gt 10V 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 STEP7 lt NRf gt 10kQ 4 wire calibration step 9E3 to 11E3 STEP8 lt NRf gt 100kQ 4 wire calibration step 90E3 to 110E3 STEP9 lt NRf gt IMQ 4 wire calibration step 900E3 to 1 1E6 STEP10 lt NRf gt 10mA DC calibration step 9E 3 to 11 3 STEP 11 lt NRf gt 100mA DC calibration step 90E 3 to 110 3 STEP 12 lt NRf gt 1A DC calibrat
136. ver a circuit board is removed or a component is replaced the Model 2015 must be recalibrated See Section 2 for details on calibrating the unit 4 4 Troubleshooting Power on self test During the power on sequence the Model 2015 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 5 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 trou bleshooting 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
137. you are using a different calibration voltage Walt until the Model 2015 completes each step before continuing Table 2 9 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 STEPA 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 Calibration 2 19 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 Q 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 10 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 2015 completes each step before continuing Table 2 10 Resistance calibration programming steps Calibration Calibrator step resistance Calibration command Parameter range 1kQ 1kQ CAL PROT DC STEP6 1E3 900 to 1

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