Home

Model 2701Ethernet-Based DMM / Data Acquisition System Service

1.
2.
3.
4.
5.
6. Eo om NON vut
7. O o 040250 0 O OLO i R43 7 C404 elit bz 27007 we dm G K A i 5 C402 5 C411 o o 2 0 E Ob i BAR CODE 2 9 i TD pm x XXXXXXX 9 O CIE jc414
8. 001 IR NO EE SCION ENG ON PRELIMINARY LM ELS 7 27 99 C OE Y RELEASED 5 9 15 99 51 DN Hv Sr E US 5 4 20 00 ADDED MC bfe LABEL TO COMP 1 20 82 24159 LM ELS 8 15 00 CHG D R1 FROM R 418 69 8K C 53 22 IA 84 DRAWING NOT AFFECTED TA Ue 4 6 SO C op RD Cy qo XXX e 019 01
9. 001 00 2 CECA NO ENG ATE A PRELIMINARY LM ELS 6 5 00 2 OT S ELL 0 510 26 00 PRIMARY SIDE COMPONENTS SIDE 04 Mi ens ue 3 2 ENS 0 M3 CO Te n DING OO E gt R5 R6 R2 L1 ee Je Eg el E 600 OO DOLO OO 4 COO ELL 912191918160 OO 5 Me meu RT x x R3 R4 L2 Ae R9 17 DE Da D Gs T NOTE FOR FURTHER COMPONENT INFORMATION R TO 2750 PRODUCT STRUCTURE MODEL NEXT ASSEMBLY QTY USED ON K E x DIM AR N IN UNLESS OTHERWISE NOTED yp no SCALE EM RRES COMPONENT LAYOUT EE DRN lt APPR DIM TOL UNLESS OTHERWISE SPEC BE
10. CHG D R1 FROM R 418 69 8K BS 2907 9 T40K SER RT 21663 DRAWING NOT AFFECTED TIA UE NC A M1 Cy MC 612 U16 EE BAR CODE XXXXXXXXx Cal amp CR27 C Lb 3 PIL TI 37 ENSE OO m O Ol ORO CR23 K1 Ke K3 K4 K5 K6 o l o e IE ILE IE E ollo K8 K24 B HO lt 92 e 9 L lt LOL m ED m bd 811 K25 m K U24 O DJ is E NU VRI C16 Q4 olo E L K17 K18 K19 K20 010 HSR T K BE SS SS E db sj K11 K12 K13 K14 K15 K16 x x x x x x x x gt E DG LL gt 1 IE IL IL IL dp 7 TE106
11. Figure 1 11 Figure 1 11 Connections for Model 7700 AC current verification Model 7700 Calibrator Output AC Current aw P INPUT SENSE CH2 gu CH4 Output lpoocoocscondocco INPUT HI TL uu C3 01 we m im am o 220 00000 _ OGO YE OU OOO 000 emere HLHLHLHL Sere C e 17 CH18 19 CH20 Output s 7 LO CH21 2 Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the AC current function by pressing the ACI key Set the Model 2701 for the 1A range Close Channel 21 by pressing the CLOSE key and keying in 121 5 Source and full scale AC currents as summarized in Table 1 12 and verify that the readings are within stated limits 6 Press the OPEN key to open Channel 21 Table 1 12 Plug in module ACI limits ACV range Applied AC voltage Reading limits 1kHz 1
12. DIE h i 1000 BEEN Output HI id LULI RRRA 4 H s Shielded Calibrator Output AC Voltage Model 7700 Cable itan LC Model 2701 Service Manual Performance Verification 1 21 2 Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the AC volts function by pressing the ACV key Close Channel 1 by pressing the CLOSE key and then keying in 101 4 Set he Model 2701 for the 100mV range make sure that REL is disabled 5 Source and 50kHz AC voltages for each of the ranges summarized in Table 1 10 and make sure that the respective Model 2701 readings fall within stated limits 6 Press the OPEN key to open Channel 1 Table 1 10 Plug in module ACV reading limits ACV Applied AC 1kHz reading limits 50kHz reading limits range voltage 1 year 18 C to 28 C 1 year 18 C to 28 C 100 0000m V 99 910 to 100 090 V 99 830 to 100 170mV 1 000000V 0 99910 to 1 00090V 0 99830 to 1 00170V 10 00000V 9 9910 to 10 0090V 9 98300 to 10 0170V 10
13. aL C2 C AJ EX C Ep lt gt _ E ele S E lt CO E 2 gt x dE D Ra E Li x x lt I E gt gt r has 75 zt C NS ER CE 3 NX E s EIS Co eS p S SiD MS Ps O TEE cm gt Ec D de 7 wn 2 7 5 Pu HIS S L lt E Wee A 228195 O 6 o QOC Q Q M T R299 C106 G eee E SCIEN 2 S T Cu rwr pd 2 C136 Es S S S LI CI Ce Ce eee 614511 0 lt Co Zee Us v 5 R123 5 O O R101 R129 O O oo sea T o OO OX D Li pem E R147 O O E 45 Co 77 S mu i C118 gt s uo ga COG OG dns ES u R327 Q R176 C245 e 1 O I 1 23 zr DOs 00 00610 ee O 7 zo sisse C124 e R278 R140 29 O OQO EI EE SL 1 8280 OO gt N R289 Ss 35 C200 R232 LE Re E
14. Se ee Sees 104 2 NOTE FOR COMPONENT INFORMATION 5 PRODUC NE COMPONENTS PS TDE 4 EE x DO NOT POPULATE UNLESS OTHERWISE SEECITTEDS OU DUM Wot S7 AE d _ DIMENSIONS ARE IN INCHES COMPONENT LAYOUT KEITHLEY INSTRUMENTS INC Pod gt 42155 APPR P S 20 CHANNEL SCANNER CARD CLEVELAND OHIO 44139 XXX t 005 Ne 77 50 50 EXCLUDES FINTSHED HOLE SIZES E 1 CONFIDENTIAL PROPRIETARY AND BOARD LAYER CONSTRUCTION DO NOT SCALE DRAWING C S 3 2 OF e QSIF 227A
15. A 2 Calculating dBm characteristics accuracy A 3 Calculating dB characteristics accuracy 4 Additional derating factors 4 Optimizing measurement accuracy 5 DC voltage DC current and resistance A 5 AC voltage and AC current A 5 SI 5 Optimizing measurement speed A 5 DC voltage DC current and resistance A 5 AC voltage and AC current A 5 Temperature TT A 5 Calibration Reference TR B 2 Command SUMMATY cas B 2 Miscellaneous calibration commands B 4 asna 4 WILL B 4 TIN 5 peo q B 5 B 6 9 6 jdjrcse NDUT 7 JP qp B 8 DC calibration commands 0220 0 9 Sud ux 9 T u uuu B 10 ux 10 Ill 10 11 I 11 5 11 SUV EE
16. 4 14 Analog signal switching states 4 14 Disassembly TA OCC RR 5 2 Handling and cleaning usd 5 2 Handling PC Doards oa 5 2 Su 5 2 Static sensitive COVICES 5 3 Assembly drawings 5 3 Disassembly procedures 5 4 Case uuu u uuu A 5 4 Motherboard remova 4l 5 4 Card cabe eT uuu lasu sasa 5 5 Front panel disassembly 5 5 Removing power components 5 6 Instrument reassembly 5 7 Input terminal wire connections 5 7 Power module wire connections 5 7 Replaceable Parts Tsa ape 6 2 SIS 6 2 Ordering information nennen 6 2 wii 6 2 Component layouts uuu uu uuu u 6 2 Specifications e Uo T A 2 Calculating DC characteristics accuracy A 2 Calculating AC characteristics accuracy
17. 12 Cla Rc B 12 ua nasua usun 12 ANS 13 IL L 13 AC calibration commands B 14 DAC 5 iS 15 Manufacturing calibration commands B 16 AC STEP L M Bs v NR TR B 16 STEPO EMT B 16 18 AN B 18 DATE XV B 19 f ll eeepc B 19 WO B 20 IC B 20 RON 20 DA 21 B 21 Remote error reporting 22 Enor SUCRE 22 En q L 24 Status byte Error Available bit 24 Detecting calibration step completion B 24 List of Illustrations 1 Figure 1 1 Figure 1 2 Figure 1 3 Figure 1 4 Figure 1 5 Figure 1 6 Figure 1 7 Figure 1 8 Figure 1 9 Figure 1 10 Figure 1 11 Figure 1 12 Figure 1 13 Figure 1 14 Figure 1 15 Figure 1 16 2 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 3 Figure 3 1 Figure 3 2 Figure 3 3 4 Figure 4 1 Figure 4 2 Figure 4 3 Figure 4 4 Performance Verification Connections for Model 2701 DC volts verification 1 8 Connections for Model 2701 AC volts verification 1 10 Connections for Model 2701 DC current verification
18. CERCA CONFIDENTIAL PROPRIETARY AND BOARD LAYER CONSTRUCTION OR S 3 2 o e OF e QSIF 227A Specifications 2701 Ethernet Multimeter Data Acquisition System DC CHARACTERISTICS CONDITIONS MED 1 PLC or 10 PLC or MED 1 PLC with Digital Filter of 10 ACCURACY of reading ppm of range TEST INPUT B n _ CURRENT 5 RESISTANCE ppm parts per million eg 10 0 001 TEMPERATURE OR BURDEN OR OPEN CKT 24 Hour 7 90 Day 1 Year COEFFICIENT FUNCTION RANGE RESOLUTION VOLTAGE VOLTAGE 23 1 23 5 23 5 0 18 C amp 28 50 C Voltage 100 0000 mV 0 1 uV gt 10 GO 15 30 25 35 30 35 1 5 C 1 000000 V 1 0 uV gt 10 GO 1546 25 7 30 7 1 1 C 10 00000 V 10 uV gt 10 GO 10 4 20 5 30 5 1 1 100 0000 V 100 uV 10 196 1546 3549 45 9 5 1 1000 000 V5 1 mV 10 1 20 6 35 9 50 9 5 Resistance 68 100 0000 Q 100 uQ mA 6 9 V 20 4 20 80 20 100 20 8 1 C 1 000000 1 mQ 1 mA 6 9 V 20 6 80 6 100 46 8 1 C 10 00000 10 100 pA 6 9 V 20 6 80 6 100 46 8 1 C 100 0000 100 mQ 10 uA 12 8 V 2046 80 10 100 10 8 1 C 1 000000 10 Q 10 uA 12 8 V 20 6 80 10 100 10 8 1 C 10 00000 7 10 0 7 uA 10M Q 7 0 V 15046 200 10 400 10 70 1 C 100 0000 MQ 7 100 Q 0 7 pA 10M 0 7 0 V 800 30 2000 30 2000 30 385
19. INSTRUMENTS INC XX2 01 ANG 1 LA HIO 44 VELAND OHIO 44139 rm AC 100 NOT SCALE THIS DRAWING 0 4 3 2 gt G 1 0F 52 e LTR ECA NO REVISION ENG DATE PRELIMINARY LM ELS 7 27 99 7 23421 RELEASED M ELS 9 15 99 455 REVISED TE S 5 4 20 00 52 24159 ADDED MC 612 LABEL COMP 170 51 8 15 00 CTO RENCE DESTGNATORS
20. 1768 C 01 0 6 C 1 8 C 0 03 C C lt 6 516 15 1 Oto 1768 C 0 1 C 0 6 C 1 8 C 0 03 C C IN crapa ve 4350to 41820C 01 C 0 6 C 1 8 C 0 03 C C 4WQ OComp RTD 6 516 17 09 0 7 10 4 Wire RTD 8 6 4 1 1000 platinum PT100 0100 F100 PT385 916 or user type Offset compensation On 5 5 16 17 18 144 0 1 200 6309 0 01 0 06 C 0 003 C C Channel Ratio 6 516 17 250 10 Thermistor 2 2kQ 5kO and 10kQ 2 Channel AVG 6 516 17 15 12 1 80 to 150 C 0 01 0 08 C 0 002 55 25 20 0 1 Multiple Channels Into gt 18 DC SYSTEM SPEEDS 5 18 7710 DCV 500 s 7703 Scanning DCV 390 s RANGE 6 50 5 42 5 excludes 4 Wire Ohms FUNCTION 5 5 50 5 42 6 AUTORANGE TIME 6 lt 30ms ASCII READINGS TO RS 232 115 2k BAUD 300 s MAX EXTERNAL TRIGGER RATE 2000 5 7703 Scanning DCV with Limits or Time Stamp 390 s 7703 Scanning alternating 2WQ 95 s Multiple Channels Into and Out of Memory 5 16 17 18 Channels s 7710 Scanning DCV 440 s 7703 Scanning DCV 360 s 7703 Scanning DCV with Limits or Time Stamp On 360 5 7703 Scanning DCV alternating 2WQ 90 s 7702 Scanning DCV 75 8 7700 and 7708 Scanning Temperature T C 60 s HW 8 01 02 Revision A Page 1 of 3 2701 Ethernet Multimeter Data Acquisition System DC SPEED vs NOISE REJECTION DC Notes 20 overrange except on 1
21. 1 12 Connections for Model 2701 AC current verification 1 13 Connections for Model 2701 resistance verification 10000 to ranges 1 14 Connections for Model 2701 resistance verification COOMO T 1 15 Connections for Model 2701 frequency verification 1 18 Connections for Model 7700 DC volts verification 1 19 Connections for Model 7700 AC volts verification 1 20 Connections for Model 7700 DC current verification 1 22 Connections for Model 7700 AC current verification 1 24 Connections for Model 7700 resistance verification 1000 to ranges 1 25 Connections for Model 7700 resistance verification TANDE uyu au Ip ndi ed deat aU 1 27 Connections for Model 7700 thermocouple temperature MENO CRIT ORE 1 29 Connections for Model 7700 frequency verification 1 31 Connections for Model 7700 ratio and average verification 1 32 Calibration Low thermal short connections 2 7 Connections for DC volts and ohms calibration 2 8 Connections for DC and AC amps calibration 2 10 Connections for AC volts calibration 2 11 Function genera
22. 8 CxO x 2g o O S mi 119 Qus o x i O o US HO R424 C410 2 ap R420 0 55 gens I 09 C40 1 ri R410 i 4 59829581698 P L _ OO OOC E 15285929105 ANON DID D OOOO OOOO OO LIESS c ME ue CAL ENABLE C412 0403 05401 401 S N SHS S A E x R412 9 5422 526 5414 5417 5404 5410 5407 5409 5401 5419 8414 8418 R401 8415 R411 R409 R404 R403 o o 02 s TT I ILI 0 DLE DU oe O e O 2 5408 E 5424 P 8402 4055 54290 5402 54160 5418 o om Olo 9 z Qm E e O O i i O O O nu O O O O O O O Li Ele 5 5 5406 5428 5420 5423 5403 5413 5412 5415 Q 5 gt gt G 5 6 x DO AOL USENET ES d EE X d ND E d O 20 O 5
23. BACKPLANE BOARD ASSEMBLY __ AN 2100 318 1 CARD CAGE T LABEL POWER MODULE DIMENSIONAL TOLERANCES Tune CABLE DO NOT SCALE THIS DRAWING qM TE ONAL TOLERINCES ep DATE 19 Dec 01 SCALE 11 FUSE HOLDER FU 106 630 Lo FUSE 630 AMP EI TIHLIE Y AN PHI POWER MODULE Keithley Instruments Inc Cleveland Ohio 44139 CONFIDENTIAL PROPRIETARY 6 12 02 28093 Del Rev s From Part Numbers ST 1 21 03 _____ POWER MODULE ASSEMBLY 1 1 POWER MODULE SEE DETAIL A FOR WIRING LIS VOLTAGE eo NOT SEL 20 FUEL PUSE GOLDER SECTION GU AND HOLDER UNTIL PROPER VOLTAGE IS SHOWN IN WINDOW ON BACK DETAIL A TRANSFORMER WIRING 004 SG don O ES Q2 POWER MODULE 270 2701 051 Power Wodule Chassis Assembly 1 MODEL NEXT ASSEMBLY NEXT PROCESS STEP USED ON PM Card Cage Assembly NO 2 9T 909p fne ENG ANG DRN Mat spon 5 XXX 005 FRAC 1 64 SURFACE 67 K A 27327 Released 157 6 12 02 AI 27541 Del Rev s From Parts ST 9 14 02 puc ____ BULGE FACES UPWARD Oe REG DI FOR TRANSFORMER WIRES Co O93 Ac REQ DJ USE 1 801 1A CENTER BETWEEN FAN STANDOFF AND THREADED STUD IN CHASSIS USE 1 801 7B AN MC 652 LABEL DE TE qu boc WE NU P1
24. 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 Example CAL PROT DATE 1999 12 16 Send cal date 12 16 1999 CAL PROT DATE Request cal date NDUE CALibration PROTected NDUE Purpose To send the next calibration due date to the instrument Format cal prot ndue year month day Parameter year 1999 to 2098 month 1 to 12 day 1 to 31 Query format cal prot ndue Response year month day Description The NDUE command allows you to store the date when calibration is next due in instrument memory You can read back the next due date from the instrument over the bus by using the NDUE query or the front panel CAL menu NOTE The next due date parameters must be delimited by commas Example CAL PROT NDUE 2000 12 16 Send due date 12 16 2000 CAL NDUE Request due date 8 Calibration Reference Model 2701 Service Manual DATA CALibration PROTected DATA Purpose To read calibration constants data Format cal prot data Response Floating point ASCII values separated by commas Descrip
25. ITALY JAPAN KOREA NETHERLANDS SWEDEN SWITZERLAND TAIWAN 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 www keithley com Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 6202 2886 Fax 8610 6202 2892 Tiet j ntie 2 02130 Espoo Phone 09 54 75 08 10 Fax 09 25 10 51 00 3 all e des Garays 91127 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 AAB 0118 929 7500 Fax 0118 929 7519 Flat 2B Willocrissa 14 Rest House Crescent Bangalore 560 001 91 80 509 1320 21 Fax 91 80 509 1322 Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 New Pier Takeshiba North Tower 13F 11 1 Kaigan 1 chome Minato ku Tokyo 105 0022 81 3 5733 7555 Fax 81 3 5733 7556 2FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 888 82 2 574 7T 18 Fax 82 2 574 7838 Postbus 559 4200 AN Gorinchem 0183 635333 Fax 0183 630821 c o Regus Business Centre Frosundaviks All 15 4tr 169 70 Solna 08 509 04 679 Fax 08 655 26 10 Kriesbachstrasse 4 8600 D bendorf 01 821 94
26. Left top Right bottom Left bottom Released 5 2 2100 110H Was 2700 11061 ST 1 8 02 41422 2101 310 STAKING FRONT PANEL REF 2701 308A FRONT PANEL O Str e 2001 371A P C BOARD STOP 2 REQ D PLACE ON FRONT PANEL TABS AND SLIDE TOWARDS OUTSIDE EDGE OF PANEL 2 00 DISPLAY BOARD ASSEMBLY SNAP TOP OF BOARD INTO FRONT PANEL o 2100 313A OVERLAY RUBBER SWITCH Z0 53 d DISSE AY DENS DO NOT REMOVE GREEN MASK FROM THE LENS USE T 7788 2101 2101 05 FP Chassis Assembly PART NUMBER DESCRIPTION MODEL NEXT ASSEMBLY NEXT PROCESS STEP 2101 310 STAKING FRONT PANEL REF 2701 3084 USED ON Front Panel OPG 2101 3114 DISPLAY LENS RL emo KETHLEY De seo 2 d 200 8 La DOAR SO SURFACE S AN ZO T F DISPLAY BOARD ASSEMBLY DIMENSIONAL TOLERANCES 2100 3134 1 OVERLY DO SCALE THIS DRAWING UM ESS SPECIFiep DATE SCALE 7 Ds DE CARD CAGE ASSEMBLY AX2100 318 CARD CAGE 2401004 Os AS PLACE IN CONNECTOR LEFT 4 40X5 16PPH WEG 0 BACKPLANE ASSEMBLY AN CA 219 1 CABLE USE 7924 BEND 2101 004 55 639 9 ASSEMBLY ______2701 004 CRIMP ASSEMBLY ____ AN 2150 130
27. 06 26 02 0 OM GENES DOSE se SIX DART Tp POM IUE TIPO US T 196 MARK APPROPRIATE Mis JE AE BETWEEN DISPLAY amp BD BOARD ASSEMBLY J 22413 Y401 Om
28. 1007 1000V Ranges 10 1 10 DCV only For AVERAGE DCV an ermocouples only Available with plug in modules EARTH ISOLATION 500V peak gt 10GQ and lt 300pF any terminal to 11 Add 6uV to of range uncertainty when using Models 7701 7703 and 7707 and 3uV for Models 7706 and chassis 7709 INPUT BIAS CURRENT 75pA at 23 12 Auto zero off COMMON MODE CURRENT lt 500nApp at 50Hz 60Hz 13 For LSYNC On line frequency 0 1 For LSYNC Off use 60dB for gt 1PLC 14 For unbalance in LO lead AUTOZERO ERROR Add 2ppm of range error 5pV for lt 10 minutes 15 Speeds are for 60Hz 50Hz operation using factory defaults operating conditions RST Autorange and off Display off Limits off Trigger delay 0 INPUT PROTECTION 1000V all ranges 300V with plug in modules 16 Speeds include measurements and data transfer out the ethernet reading element only 100BaseT Ethernet 3 meter RJ 45 crossover cable PIII 800 Windows version 98 SE VB version 6 0 direct s Winsocket interface Resistance 17 Sample count 1000 into memory buffer auto zero off 4W LEAD RESISTANCE 10 of range per lead for 1000 and kO 18 Auto zero off NPLC 0 002 ranges 1kQ per lead for all other ranges 19 Additional Uncertainty Plug In Modules OFFSET COMPENSATION Selectable on 4WQ 1000 1 and 10kQ ranges Front Terminals 7709 7701 7703 7707 7700 7708 7710 7706 Simulated Simulated Simulate
29. Index AC STEP B 15 B 16 CODE B 4 B 18 COUNt B 4 B 18 DATE B 7 DATE B 19 DC STEPO 16 INIT B 5 B 19 LOCK 5 B 20 LOCK B 6 B 8 B 20 NDUE B 7 RCOunt B 20 6 B 21 5 21 STEP1 9 STEPIO B 12 11 B 13 STEP12 13 STEP2 10 STEP3 B 10 5 4 B 10 STEP5 B 11 STEP6 B 11 STEP7 B 11 STEP8 B 12 STEP9 B 12 AC calibration commands B 14 AC characteristics accuracy A 2 AC current A 5 verifying Model 2700 1 13 AC voltage A 5 verifying Model 2700 1 10 verifying Model 7700 1 20 ACA signal switching 4 17 Accuracy calculations A 2 and ACA signal multiplexing and gain 4 17 and FREQ signal switching 4 15 AMPS input 4 10 Analog circuitry 4 10 block diagram 4 11 Analog signal switching states 4 14 Assembly drawings 5 3 battery replacement 3 6 Calibration 2 1 calibration aborting 2 6 AC current 2 12 AC voltage 2 11 code 2 4 comprehensive 2 5 considerations 2 3 cycle 2 5 DC current 2 10 DC voltage 2 8 front panel 2 6 front panel short and open 2 7 Model 7700 2 22 Model 7700 and 7706 2 22 preparing the Model 2700 2 6 recommended equipment 2 5 Remote Model 7700 2 23 resistance 2 9 setting dates and saving 2 12 step completion B 24 calibration code front panel 2 4 remote 2 4 calibration commands AC B 14 DC B 9 manufacturing B 16 miscellaneous B 4 Model 7700 and 7706 B 17 Calibration error summary B 22 Calibration Reference B 1
30. KEI I HLEY thernet base ata ACQUISITION stem Model 2701 kthernet Based DMM Data Acquisition Sy Service Manual A GREEN MEASURES ONFIDENCE WARRANIY 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 transportation prepaid to the indicated service facility Repairs will be made and the product returned transportation prepaid Repaired or replaced products are warranted for the balance of the original warranty period or at least 90 days LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modification without Keithley s express written consent or misuse of any product or part This warranty also does not apply to fuses software non rechargeable batteries damage from battery leakage or problems arising from normal wear or failure to follow instructions THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR I
31. STEP2 STEP3 STEPA STEPS STEP6 STEP7 STEPS 5 9 STEPIO STEPI T 5 2 5 10mV AC at 1kHz calibration step 100mV AC at calibration step 100mV at 50kHz calibration step 1V AC at 1kHz calibration step I V AC at 50kHz calibration step 10V AC at 1kHz calibration step 10V at 50kHz calibration step 100V AC at calibration step 100V AC at 50kHz calibration step 700V AC at calibration step 100mA AC at calibration step AC at calibration step 2A AC at 1kHz calibration step Model 2701 Service Manual Calibration Reference B 15 5 lt gt CALibration PROTected AC STEP lt n gt Purpose To program individual AC calibration steps Format cal prot ac step lt n gt Parameter 1 10mV AC at 1 2 calibration step 2 100mV AC at IKHZ calibration step 3 100 AC at 50kHz calibration step 4 1V AC at IkHz calibration step 5 IV AC at 50kHz calibration step 6 10V AC at IKHz calibration step 7 10V AC at 50kHz calibration step 8 100V AC at IKHz calibration step 100V AC at 50khz calibration step 10 700V AC at calibration step 11 100mA AC at calibration step 12 1A AC at IkHz calibration step 13 2A AC at IkHz calibration step Description The AC STEP command programs the 13 individual AC calibration steps n represents the calibration step number The appropriate signal must be connected to th
32. 003 0 005 003 0 006 005 0 01 006 0 03 01 3 Hz 10 Hz 10 Hz 3 kHz 3 kHz 5 kHz Current 1 000000 A 1 0 uA 90 Day 1 Yr 0 3 0 04 0 10 0 04 0 14 0 04 3 00000 A 10 uA 0 35 0 06 0 15 4 0 06 0 18 0 06 Temp Coeff C 0 035 0 006 0 015 0 006 Accuracy ppm of reading offset ppm 3 Hz 500 kHz 333 ms 2 us 100mV 0 333ppm 90 Day 1 Yr 100 ppm 0 333 ppm SLOW 1s gate and Period to 3 33 ppm 100 ppm 3 33 ppm MED 100ms gate 750 V 33 3 ppm 100 ppm 33 3 ppm FAST 10ms gate HW 8 01 02 Revision A Page 2 of 3 2701 Ethernet Multimeter Data Acquisition System Additional Uncertainty of reading Low Frequency Uncertainty MED FAST 20Hz 30Hz 0 3 30Hz 50Hz 0 50 Hz 100 Hz 0 1 0 100 Hz 200 Hz 0 0 18 200 Hz 300 Hz 0 0 10 5300 Hz 0 0 CREST FACTOR 5 1 2 2 3 3 4 4 5 Additional Uncertainty 005 015 030 0 40 Maximum Crest Factor 5 at full scale AC MEASUREMENT CHARACTERISTICS AC Volts MEASUREMENT METHOD AC coupled True RMS INPUT IMPEDANCE 1 2 by lt 100 INPUT PROTECTION 1000Vp or 400VDC 300Vrms with plug in mod ules AC Current MEASUREMENT METHOD AC coupled True RMS SHUNT RESISTANCE 0 10 BURDEN VOLTAGE 1A 0 5Vrms 3A 1 5Vrms Add 1 5Vrms when used with plug in modules INPUT PROTECTION 3A 250V fuse Frequency and Period MEASUREMENT METHOD Reciprocal Counting technique GATE TIME SLOW 1s MED 100m
33. 1 C Continuity 2W 1 000 100 m 1 mA 6 9 V 40 100 100 100 100 100 8 1 C Current 20 00000 mA 10 nA 0 2 V 60 4 30 300 80 500 80 50 5 C 100 0000 mA 100 nA 0 1 V 100 4 300 300 800 500 800 50 50 C 1 000000 A 1 0 uA V 200 4 30 500 80 800 80 50 5 3 000000 A 10 uA gili W 1000 15 1200 40 1200 40 50 5 Channel Ratio 10 Ratio Accuracy Accuracy of selected Channel Range Accuracy of Paired Channel Range Channel Average Average Accuracy Accuracy of selected Channel Range Accuracy of Paired Channel Range TEMPERATURE DC MEASUREMENT SPEEDS 5 Displayed in F or Exclusive of probe errors Single Channel 60Hz 50Hz Operation Thermocouples Accuracy based on ITS 90 FUNCTION DIGITS READINGS s PLCs 90 Day 1 Year 23 C x 5 C DCV 10M 6 5 1216 5 4 10 Relative to Using Temperature Thermocouple 6 516 35 28 1 Simulated 77 Coefficient Thermistor 6 5 1216 50 48 1 Type Range Resolution Reference Junction Module 0 18 C amp 28 50 C 5 5 12 16 150 120 0 1 J 200to 760 C 0 001 0 2 C 1 0 C 0 03 C C 5 5 16 17 300 240 0 1 K 200 to 1372 C 0 001 0 2 C 1 0 0 03 C C 5 517 500 400 0 1 200to 1300 C 0 001 0 2 C 1 0 C 0 03 C C 4 517 3000 3000 0 006 T 200to 400 0 001 0 2 1 0 0 03 3 517 3500 3500 0 002 E 200 to 1000 C 0 001 0 2 C 1 0 C 0 03 4WO lt 10 6 516 1 4 1 1 10 R
34. 26 O00 000 etl 5 2 Donc Output ooo dune LO O00 OCD OO Note Use shielded cables to minimize CH11 noise Disable calibrator external sense mode 1 28 Performance Verification Model 2701 Service Manual Verifying temperature Thermocouple thermistor and RTD temperature readings are derived from DC volts and resistance measurements respectively For that reason it is not necessary to independently verify the accuracy of temperature measurements As long as the DC volts and resistance functions meet or exceed specifications temperature function accuracy is automatically verified However temperature verification procedures are provided below for those who wish to separately verify temperature accuracy Thermocouple temperature 1 Connect the DC voltage calibrator output terminals and ice point reference to the Model 7700 CH1 H and L INPUT terminals using low thermal shielded connections as shown in Figure 1 14 2 Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the temperature function by pressing the TEMP key Close Channel 1 by press ing the CLOSE key and keying in 101 4 Configure the Model 2701 for units type temperature sensor and internal ref
35. 32K X8 BIT 70NS 3 3V LSI 291 1 U805 U807 UHS CONFIGURABLE 2 INPUT GATE 1 1492 09 102 VR103 VR104 VR105 VR106 VR124 VR125 VR107 VR108 VR110 VR122 VR123 VR109 VRII2 VRI13 VRII9 VR120 1 102 X2 FPGA 2 5V DIODE ZENER 6 0V BZX84B6V2 DIODE ZENER 6 8V MMSZ5235BT1 DIODE ZENER 11V MMSZ11T1 DIODE ZENER 5 1 V BZX84C5VI DIODE ZENER 17V MMBZ5247BL DIODE ZENER 6 2V MMSZ6V2 DIODE ZENER 12V MMSZ12T1 CRYSTAL OSCILLATOR 50M CRYSTAL OSCILLATOR 12M CRYSTAL FSM327 LSI 292 1 DZ 87 DZ 100 DZ 103 DZ 88 DZ 104 DZ 97 DZ 112 CR 73 4 CR 75 1 CR 41 Model 2701 Service Manual Table 6 2 Model 2701 display board parts list Circuit designation 406 408 410 412 413 C414 CR401 CR402 DS401 P1014 R401 R404 R406 R409 R411 R414 R418 R405 R408 R410 R412 R413 R419 R420 R421 U401 U402 U403 401 Table 6 3 Model 2701 backplane board parts list Circuit designation J1 J2 J3 14 15 J6 J7 IT L2 R1 R3 R2 R4 R13 Replaceable Parts 6 11 401 402 411 403 404 405 407 409 CAP 1UF 20 50V CERAMIC CAP 10 100V CERAMIC CAP 1UF 20 50V CERAMIC CAP 22UF 20 6 3 TANTALUM CAP 47PF 10 100V CERAMIC DIODE MBRO0520LTI DISPLAY CABLE ASSEMBLY RES 15k 1 100MW THICK FILM RES 12 1 1 1 4W METAL FILM RES 13K 1 100MW THICK FILM RES 10M 5 125MW METAL FILM RES 10K 1 100MW THICK FILM P
36. 59 968794 9 964mV dBm 20105 joy 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 pertinent specifications ranges and other reference voltages Additional derating factors In some cases additional derating factors must be applied to calculate certain accuracy values For example an additional derating factor of 0 02ppm V must be added to DCV specifications for voltages over 500V Before calculating accuracy study the associated specifications very carefully to see if any derating factors apply Model 2701 Service Manual Specifications A 9 Optimizing measurement accuracy The configurations listed below assume that the multimeter has had factory setups restored DC voltage DC current and resistance Select 62 digits 10 PLC filter ON up to 100 readings fixed range Use REL on DC voltage and 2 wire resistance measurements e Use 4 wire resistance measurements for best accuracy AC voltage and AC current Select 62 digits 10 PLC filter ON up to 100 readings fixed range Temperature Select 62 digits 10 PLC filter ON up to 100 readings Optimizing measurement speed The configurations listed below assume that the multimeter has had factory setups restored DC voltage DC current and resistance Select 3 digits 0 01 PLC filter OFF fixed range A
37. 99 9880 to 100 01200 0 999894 to 1 000106kQ 9 99894 to 10 00106 99 9890 to 100 01 10k 0 999890 to 1 0001 10MQ 9 99370 to 10 00630MQ 99 5770 to 100 4230MQ Enable OCOMP for 100Q range Calculate limits based on actual calibration resistance values and Model 2701 one year resistance accuracy specifications See Verification limits Model 2701 Service Manual Performance Verification 1227 8 Connect the Model 7700 CH1 and CH11 terminals to the calibrator as shown in Figure 1 13 9 Disable external sense on the calibrator 10 Set the Model 2701 for the 100M range 11 Source a nominal 1 resistance value and verify that the reading is within calcu lated limits for the range 12 Press the OPEN key to open Channel 1 Figure 1 13 Connections for Model 7700 resistance verification 100 range CH1 gt Model 7700 Calibrator Output 2 wire Resistance 22 eo ET KE E E L Output EF 2 HI RU OOOOOOOOOO00
38. Card cage removal 5 5 Case cover removal 5 4 Command summary B 2 Component layouts 6 2 Connections AC volts calibration 2 11 DC and AC amps calibration 2 10 DC volts and ohms calibration 2 8 Input terminal wire 5 7 manufacturing calibration 2 20 Model 2700 AC current verification 1 13 Model 2700 AC volts verification 1 10 Model 2700 DC current verification 1 12 Model 2700 DC volts verification 1 8 Model 2700 frequency verification 1 18 Model 2700 resistance verification 100 range 1 15 Model 2700 resistance verification 1000 F to ranges 1 14 Model 7700 AC current verification 1 24 Model 7700 AC volts verification 1 20 Model 7700 DC current verification 1 22 Model 7700 DC volts verification 1 19 Model 7700 frequency verification 1 31 Model 7700 ratio and average verification 1 32 Model 7700 resistance verification 100 range 1 27 Model 7700 resistance verification 1000 to ranges 1 25 Model 7700 thermocouple temperature verification 1 29 Power module wire 5 7 dB characteristics accuracy 4 dBm characteristics accuracy 3 DC calibration commands B 9 DC characteristics accuracy 2 DC current A 5 verifying Model 2700 1 12 verifying Model 7700 1 22 DC voltage A 5 Verifying Model 2700 1 8 verifying Model 7700 1 18 DCA signal multiplexing and gain 4 18 DCA signal switching 4 16 DCV signal multiplexing and gain 4 17 DCV signal switching 4 14 derating factors additional A 4 Digi
39. Do zt R168 R16 R25 1 RI mate Q cio R26 16 Er R190 O ras e 00 Ope 4 8 ENS 5 6 ELE e cO OO oo R21 R58 R189 ao C228 COE oO OS R44 15 0 Ip 21 11 RS QUO 1 11 R323 185 1 219 R74 C230 nba 7 8 51 1 6263 eal R128 C R73 U cea R5 i IR29 LI LII LI C28 OO n co 6060 ap ree comme usn eir m DU C esp R R38 R142 R72 OO P R17 _ R31 C193 R77 S O 835 R20 5 R350 Q lt x PLO C17 dim C241 22 cog R28 19 1103 E enum Sooo ee c L em 4 2 C27 CIZ 25 3 C14 C R40 o OOS o S E C215 reo 138 0 caa L104 uo E C35 Emu L C286 R24 Cigg R60 R50 sis B 0 OO oo ue Tess E C R22 R75 L4 50 0 Li R13 Doe OL ese 63 R388 C282 C201 c266 R69 ae C75 R64 Co Css csi ces O LJ COCA LC an we 1 T Coo uu coco
40. O 0 29 O O O 7 Q D D O we we BAI Xu uu Sree 122100 FH TURE D 0 B MODEL NEXT ASSEMBLY QTY SCALE noe USED ON SE ER INE IL E E ATE SCALE E DIM ARE IN IN UNLESS OTHERWISE NO D i OUT De K H u COMPONENT LATTAT _ _ DD T D DIM TOL UNLESS OTHERWISE SPECIFIED U N AJS APPR CJM DISPLAY BOARD II EY ENS ENS BAN eeu E C NO lt a_i m C CO 4 3 2 TE 4
41. THICK FILM RES 267 1 1 2W METAL FILM RES 4 02K 1 100MW THICK FILM RES 10 10 100MW THICK FILM RES 475 1 1 4W METAL FILM RES 66 5K 1 100MW THICK FILM RES 357 1 100MW THICK FILM RES IK 1 100MW THICK FILM RES 1 28M 1 1 8W METAL FILM RES 49 9 1 1 4W METAL FILM RES 499 1 100MW THICK FILM RES 20K 1 100MW THICK FILM RES 100 1 100MW THICK FILM RES IK 1 1 10W METAL FILM RES 9 09 1 1 10W METAL FILM RES 392 1 100MW THICK FILM RES 332 1 100MW THICK FILM RES 100K 1 1000MW THICK FILM RES 73 2K 1 100MW THICK FILM RES 150 1 100MV THIN FILM RES 1 100MW THICK FILM RES 6 04K 1 125MW THIN FILM Replaceable Parts 6 7 Keithley part no 391 4 42 R 391 2 21K R 391 2 21K R 375 470 R 418 475 R 418 249 R 418 4 75K 418 49 9 391 100 418 5 418 475 403 2 2 418 200 403 2 2 R 418 34K R 418 22 1K R 418 82 5 R 418 34K R 94 267 R 418 4 02K R 418 10 391 475 R 418 66 5K R 418 357 418 1 176 1 28 391 49 9 418 499 418 20 418 100 263 1 263 9 09 418 392 418 332 418 100 R 418 73 2K R 438 150 R 418 1K R 423 6 04K 6 8 Replaceable Parts Table 6 1 Continued Model 2701 motherboard parts list Circuit designation R352 R353 R354 R38 R95 R97 R100 R111 R118 R122 R127 R382 R419 R801 R168 R69 R73 R74 R77 R79 R394 R22 R54 R89 R90 R
42. the calibration date then press ENTER 2 The unit will then prompt you to enter the next calibration due date with this prompt CAL NDUE Use the left and right arrow keys and the range keys to set the calibration due date then press ENTER 3 The unit will prompt you to save new calibration constants with this message SAVE CAL YES To save the new constants press ENTER If you do not want to save the new constants press the down range key to toggle to NO then press ENTER NOTE Calibration constants calculated during the present calibration procedure will not be saved unless you choose the YES option Previous calibration constants will be retained if you select NO Model 2701 Service Manual Calibration 2 13 Remote calibration Follow the steps in this section to perform comprehensive procedures via remote See Appendix B for a detailed list and description of remote calibration commands When sending calibration commands be sure that the Model 2701 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 via remote See Detecting calibration step completion in Appendix B The procedures for calibrating the Model 2701 via remote include e Preparing the Model 2701 for calibration Short and open calibration DC voltage calibration e Resistance calibration DC current calibration AC voltage calibr
43. volts verification tests 6 Source positive and negative and full scale voltages for each of the ranges listed in Table 1 9 For each voltage setting be sure that the reading is within stated limits 7 Press the OPEN key to open Channel 1 Table 1 9 Plug in module DCV reading limits Applied DC voltage Reading limits 1 year 18 to 28 100 0000mV 99 9935 to 100 0065mV 1 000000V 0 999963 to 1 000037V 10 00000V 9 99965 to 10 00035V 100 0000V 99 9946 to 100 0054V 300 000V 299 976 to 300 024 V Source positive and negative values for each range 1 20 Performance Verification Model 2701 Service Manual Verifying AC voltage Check AC voltage accuracy by applying accurate AC voltages at specific frequencies from the AC voltage calibrator to the Model 7700 inputs and verifying that the displayed readings fall within specified ranges CAUTION Do not exceed 300V RMS between plug in module INPUT H and L terminals or between adjacent channels or 8 x 107 VeHz input because instrument damage may occur Follow these steps to verify AC voltage accuracy 1 Connect the Model 7700 and L INPUT terminals to the AC voltage calibrator as shown in Figure 1 9 Figure 1 9 Connections for Model 7700 AC volts verification Amplifier Connect to calibrator
44. 0 or higher required Web pages served by 2701 HW 8 01 02 Revision A Page 3 of 3 7700 20 Channel Differential Multiplexer w Automatic CJC GENERAL 20 CHANNELS 20 channels of 2 pole relay input All channels config urable to 4 pole 2 CHANNELS 2 channels of current only input RELAY TYPE Latching electromechanical ACTUATION TIME lt 3ms CAPABILITIES CHANNELS 1 20 Multiplex one of 20 2 pole or one of 10 4 pole signals into DMM CHANNELS 21 22 Multiplex one of 2 2 pole current signals into DMM INPUTS MAXIMUM SIGNAL LEVEL Channels 1 20 300V DC or rms 1A switched 60W 125VA maximum Channels 21 22 60V DC or 30V rms 3A switched 60W 125VA maxi mum CONTACT LIFE typ gt 105 operations at max signal level gt 108 operations cold switching CONTACT RESISTANCE 19 at end of contact life CONTACT POTENTIAL lt 500nV typical per contact max lt 500nV typical per contact pair LuV max OFFSET CURRENT 100pA CONNECTOR TYPE Screw terminal 420 AWG wire size ISOLATION BETWEEN ANY TWO TERMINALS gt 10 Q lt 100pE ISOLATION BETWEEN ANY TERMINAL AND EARTH gt 1090 lt 200 CROSS TALK 10MHz 500 Load lt 40dB INSERTION LOSS 500 Source 500 Load 0 1dB below 1MHz 3dB below 2MHz COMMON MODE VOLTAGE 300V between any terminal and chassis T C COLD JUNCTION 1 0 C 18 28 C Mainframe Temp 1 5 0 18 C amp 28 50 C Mainframe Temp
45. 2701 completes each step before continuing Table 2 12 AC current calibration programming steps Calibration step Calibrator current frequency Calibration command 100mA at IkHz 100 0000mA 1kHz CAL PROT AC STEPIT1 1A at 1kHz 1 000000A 1kHz CAL PROT AC STEPI2 2A at IkHz 2 000000A 1kHz CAL PROT AC STEP13 Programming calibration dates Program the present calibration date and calibration due date by sending the following commands CAL PROT DATE year month day CAL PROT NDUE year month day For example the following commands assume calibration dates of 12 15 1999 and 12 15 2000 respectively CAL PROT DATE 1999 12 15 CAL PROT NDUE 2000 12 15 Saving calibration constants After completing the calibration procedure send the following command to save the new calibration constants CAL PROT SAVE NOTE Calibration constants will not be saved unless the CAL PROT SAVE command is sent Locking out calibration After saving calibration send the following command to lock out calibration CAL PROT LOCK Model 2701 Service Manual Calibration 2 19 Manufacturing calibration The manufacturing calibration procedure is normally performed only at the factory but the necessary steps are included here in case the unit is repaired and the unit requires these calibra tion procedures NOTE Ifthe unit has been repaired the entire comprehensive calibration procedure should also be performed in
46. 5 125MW METAL FILM RES 470 5 125MW METAL FILM RES 4 22K 1 125MW METAL FILM RES 137 1 125MW METAL FILM RES 499 1 100MW THICK FILM CONN 4 PIN BB 125 04 CONN 6 PIN IC 8 STAGE SHIFT STORE MC14094BD IC CENTIGRADE TEMP SENSOR LM35DM IC RETRIG MULTIVIB 74HC123AM C 418 1 C 558 220 C 465 47P C 418 1 C 465 47P C 476 4 7 RF 82 RF 83 RF 82 FU 107 1 CS 1065 1 RL 225 RL 242 TG 360 TG 388 TG 389 TG 388 TG 389 TG 392 TG 388 TG 389 R 418 69 8K R 375 4 7K R 418 1K R 391 3 01K 391 4 22 418 10 391 2 21 R 375 1K R 375 1K R 375 470 391 4 22 391 137 418 499 115 4 115 6 772 906 788 6 14 Replaceable Parts Model 2701 Service Manual Table 6 5 Continued Model 7700 parts list IC 2 5V CASCADABLE SERIAL EEPROM LSI 212 IC QUAD 2 IN AND 74 IC 837 IC 8 ANA MULTIPLEXER DG408DY IC 844 IC POS NAND GATES INV 7 14 IC 656 IC DUAL OPTO IC 1358 TOP COVER HEAT STAKE ASSEMBLY 7700 302A BOTTOM CARD COVER 7702 301C COMPRESSION SPRING SP 7 3
47. ENTER and note the unit displays the sensor type SENS TCOUPLE Using the cursor and range keys set the display as follows SENS 4W RTD Press ENTER and note the unit displays 100 Using the cursor and range keys set the unit for the following display TYPE PT385 f Press ENTER to complete the temperature configuration process os Set the decade resistance box to each of the values shown in Table 1 15 and verify that the temperature readings are within the required limits Open Channel when finished Table 1 15 Plug in module four wire RTD temperature verification reading limits Applied resistance Reading limits 1 year 18 to 28 22 800 190 06 to 189 94 C 100 00Q 0 06 to 0 06 C 313 590 599 94 to 600 06 C Based amp 0 00385 See text Model 2701 Service Manual Performance Verification 1 31 Verifying frequency Follow the steps below to verify the Model 2701 frequency function 1 Connect the function generator to the Model 7700 L INPUT terminals See Figure 1 15 2 Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the unit to warm up for one hour before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Setthe function generator to output a IKHz RMS sine wave Select the Model 2701 frequency function by pressing the FREQ key Close Channel 1 by pressing the CLOSE key and keying
48. ENVIRONMENTAL OPERATING ENVIRONMENT Specified for 0 C to 50 C Specified to 80 R H at 35 C STORAGE ENVIRONMENT 25 C to 65 C WEIGHT 0 45kg 1 Ib Card Input LO HI Card Sense Channel 1 LO Channels 2 9 HI Channel 10 Cold junction Ref x3 HI Channel 11 LO Channels 12 19 HI Channel 20 Channel 21 LO HI Channel 22 LO 2 4 Pole Closed see Note Channel 23 Channel 25 see Note Backplane isolation O O HI Channel 24 see Note Backplane isolation To Model 2700 or 2750 Backplane Channels 23 25 in this schematic refer to the designations used for control and not actual available channels For more information refer to the ROUTe MULTiple command section in the Model 2700 or 2750 User s Manual Channels 24 and 25 can be individually controlled using ROUTe MULTiple if the module is not to be connected to the internal DMM SBG 2 21 01 Rev A 6 Specifications Model 2701 Service Manual 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 and 10 0 001 As an example of how to calculate the actual reading limits assume that you are measuring SV on the 10V r
49. Limits off Trigger delay 0 8 For ACV inputs at frequencies of 50 or 60Hz 10 add the following to of Range uncertainty 100mV 0 25 1V 0 05 10V 0 13 100V 0 03 750V 0 01 9 Auto Zero off 10 Sample count 1000 11 DETector BANDwidth 300 with nPLC 0 006 12 Maximum useful limit with trigger delay 175ms 13 Includes measurement and data transfer out ethernet Reading Element only 100bTx Ethernet 3 meter RJ 45 crossover cable 800 Windows version 98 SE VB version 6 0 direct Winsocket interface GENERAL SPECIFICATIONS EXPANSION SLOTS 2 POWER SUPPLY 100V 120V 220V 240V 10 LINE FREQUENCY 45Hz to 66Hz and 360Hz to 440Hz automatically sensed at power up POWER CONSUMPTION 80VA OPERATING ENVIRONMENT Specified for 0 to 50 Altitude 2000m above Sea Level Specified to 80 RH at 35 STORAGE ENVIRONMENT 40 C to 70 BATTERY Lithium Ion battery backed memory 30 days of buffer storage 23 and 4 hours charge time Battery lifetime 3 years 23 1 5 years 8 50 WARRANTY 3 years excludes battery Conforms to European Union Directive 89 336 EEC EN61326 1 SAFETY Conforms to European Union Directive 73 23 EEC EN61010 1 VIBRATION MIL PRF 28800F Class 3 Random WARM UP 2 hours to rated accuracy DIMENSIONS Rack Mounting 89mm high x 213mm wide x 370mm deep 3 5 in x 8 375 in x 14 563 in Bench Configuration with handle and feet 104mm high x
50. O C202 CI 5 as Res C31 C46 C53 cs4l L C R136 gt S ini E L R801 cu 4 x r R89 C50 4 R233 R68 C48 C59 6 co 161 O LU t C52 o R160 a S DET T ESS LITE leas HO R253 OO O0 DH OI cs 5 i T 2640 5695 uL R83 20 nin s B cog 179 Go m 0 C271 L11 C130 R178 DUM R24 EE C81 DEI DFT R187 Ean lt lt ILI 9 C257 s amps R195 L R19 ool ee O L L OIL 0 R206 O cas oof 0 L lass EAEE se gt C173 802 gt T R220 1 c166 11 R166 20000 pe R211 R209 R219 SAN ano R202 T 204 e 180 rA O OODO AG a O Pa lt oc 2 S P OI 181 R180 554 TE bags MEC MES LL S _ e nes gt c QE x OQ 52 D _ P REVISION ENG DATE A A ARTWORK WAS REV G ADDED C415 C418 R422 R426 i 1821 C414 FROM C 451 47P TO C 451 1000P AJ
51. T T 3 2 Setting the line voltage and replacing the line fuse 3 2 Replacing the front terminal AMPS fuse 3 4 Replacing Model 7700 plug in module amps fuses 3 5 Replacing non volatile RAM battery 3 6 Plug in module relay closure count 3 7 Closure count commands 3 7 Reading relay closure count 3 7 Resetting relay closure count 3 8 Setting count update interval 3 8 Troubleshooting Joan 4 2 Repair considerations 0 4 2 Powerom Lap 4 3 RAM and EPROM tests 4 3 SET 4 3 Front panel E 4 4 Principles of Operation ee 4 5 4 5 Display DOG T 4 6 AR 4 8 IE 4 10 Troubleshooting u aaa 4 13 Display board checks 4 13 Power Supply checks 4 13 Digital circuitry checks
52. a shock hazard For the plug in modules the maximum common mode voltage volt age between any plug in module terminal and chassis ground is 300V DC or 300V RMS Exceeding this value may cause a breakdown in insulation creating a shock hazard e When using the front panel terminals simultaneously with plug in modules all cable insulation voltage ratings must equal or exceed the maximum voltage applied to either the front panel terminals or the plug in module terminals 2 4 Calibration Model 2701 Service Manual 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 then TEST then use the up or down range key to display TEST CALIB Press ENTER and note that the instrument displays the following CAL DATES Use the up or down range key to scroll through the available calibration items until the unit displays RUN then press ENTER The Model 2701 then prompts you to enter a code CODE 000000 The factory default code 18 002701 Use the left and right arrow keys to move among the digits use the up range key to increment numbers and press the down range key to specify alphabetic letters Confirm the code by pressing ENTER The Model 2701 allows you to define a new calibration code Use the up and dow
53. addition to the manufacturing calibration procedure Recommended test equipment Table 2 13 summarizes the test equipment required for the manufacturing calibration steps In addition you will need the calibrator see Table 2 1 and signal generator to complete the comprehensive calibration steps Table 2 13 Recommended equipment for manufacturing calibration Stanford Research Systems DS345 Function Generator IV 5 3Hz 5ppm IV RMS 5 Keithley Model 2001 or 2002 Digital Multimeter 1 V 3Hz AC 0 13 Keithley 7797 Calibration System Calibration card preparation Before performing manufacturing calibration short the HI LO SHI and SLO terminals of 100 on the Model 7797 Calibration System card together using the supplied jumpers See the Model 7797 documentation These connections will form a low thermal short necessary for the manufacturing calibration procedure The Model 7797 should then be installed in scanner Slot 1 Unlocking manufacturing calibration To unlock manufacturing calibration press and hold in the OPEN key while turning on the power 2 20 Calibration Model 2701 Service Manual Measuring function generator signal amplitude The 3Hz function generator signal amplitude must be accurately measured using the digital multimeter listed in Table 2 13 Proceed as follows l Connect the function generator output to the digital multimeter INPUT jacks See Figure 2 5 for typic
54. average Model 2701 Service Manual Performance Verification l 7 Test considerations When performing the verification procedures Be sure to restore factory defaults as outlined above Make sure that the equipment is properly warmed up and connected to the correct input terminals Also make sure that the INPUTS switch is in the correct position Do not use autoranging for any verification tests because autorange hysteresis may cause the Model 2701 to be on an incorrect range For each test signal you must manu ally set the correct range for the Model 2701 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 WARNING Observe the following safety precautions when performing these tests Some of the procedures in this section may expose you to dangerous voltages Use standard safety precautions when such dangerous voltages are encountered to avoid personal injury or death caused by electric shock e For the front panel terminals only the maximum common mode volt age voltage between INPUT LO and chassis ground is 500V peak Exceeding this value may cause a breakdown in insulation creating a shock hazard e For the plug in modules the maximum common mode voltage volt age between any plug in module terminal and chassis ground is 300V DC or 300V RMS Exceeding this value may cause a breakdown in insulation creating a sh
55. command Request comprehensive cal lock state 0 locked 1 unlocked Save cal constants to EEROM Send cal date to 2701 Request cal date from 2701 Send next due cal date to 2701 Request next due cal date from 2701 Request calibration constants data DC cal steps Rear scanner terminals short step Front terminal short circuit Open circuit 10V DC step 10V DC step 100V DC step 4 wire step 10kQ 4 wire step 100kQ 4 wire step Model 2701 Service Manual Calibration Reference B 3 Table B 1 Continued Remote calibration command summary CALibration PROTected STEPO lt NRf gt IMQ 4 wire step STEPIO lt NRf gt 10mA DC step STEPII lt NRf gt 100mA DC step STEPI2 lt NRf gt DC step AC AC cal steps STEPI 10mV AC at 1kHz step STEP2 100mV AC at step STEP3 100mV AC at 50kHz step STEPA IV AC at IKHz step STEPS I V AC at 5 step STEP6 10 AC at 1kHz step STEP7 10 AC at 50kHz step STEPS 100V AC at step 5 9 100V AC at 5 step STEPIO 700V AC at 1kHz step STEP11 100mA AC at 1kHz step STEPI2 1A AC at 1kHz step STEPI3 2A AC at 1kHz step STEPIA IV AC at 3Hz stepl STEPI5 IV AC at IKHz step NOTE Upper case letters indicated short form of each command For example instead of sending CALibration PROTected INITiate you can send CAL PROT INIT 1 DC STEPO AC STEP14 and AC STEP15 are one time facto
56. cracks or breaks before each use When installing equipment where access to the main power cord is restricted such as rack mounting a separate main input pow er disconnect device must be provided in close proximity to the equipment and within easy reach of the operator 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 ca 5 02 bles 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 AI ways make measurements with dry hands while standing on a dry insulated surface capable 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 in formation 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
57. 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 If Or E is present connect it to safety earth ground using the wire recommended in the user documentation The N symbol on an instrument indicates that the user should refer to the operating instructions located in the manual The symbol on an instrument shows that it can source measure 1000 volts or more including the combined 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 war ranty 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 ap provals may be used if the rating and type are the same Other
58. has been calibrated Request card calibration date 18 Calibration Reference Model 2701 Service Manual CODE CALibration PROTected CODE Purpose To program the calibration code or password so that you can perform the Model 7700 calibration procedures Format calsproticode char string Parameter Up to a 8 character string including letters and numbers Description The CODE command enables the Model 2701 calibration procedures when performing these procedures over the bus This command must be sent to the unit before sending any other Model 7700 calibration command The default calibration code is KI002701 NOTES The CODE command should be sent only once before performing calibration Do not send CODE before each calibration step The code parameter must be enclosed in single quotes Example CAL PROT CODE KI002701 Send default code of KI002701 LOUN CALibration PROTected CARD1 COUNt CALibration PROTected CARD2 COUNt Purpose To determine how many times a Model 7700 has been calibrated Format cal prot cardl coun caltiprot cardZ coun Response n Calibration count Description The CARD1 COUNt 2 and CARD2 COUNt commands allow you to determine how many times a Model 7700 in Slot 1 and Slot 2 respectively has been calibrated NOTE Use the COUNt command to help you monitor for unauthorized calibration procedures Example CAL ICARDI COUN Request card 1 calibrat
59. in 101 5 Verify that the Model 2701 frequency reading is between 0 9999kHz and 1 0001kHz Figure 1 15 Connections for Model 7700 frequency verification CH1 Function Generator D ooo 500 Coax Cable Q c3 e C e Of Model 7700 5 1 32 Performance Verification Model 2701 Service Manual Verifying ratio and average Follow the procedure below to verify ratio and average CAUTION Exceeding 300V between plug in module INPUT or SENSE H and L terminals may cause instrument damage 1 Connect the Model 7700 CH1 and CH11 H and L terminals to the DC calibrator as shown in Figure 1 16 2 Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the Model 2701 function and the range Close Channel 1 by pressing t
60. make sure the FILTER is on Enable OCOMP offset compensated ohms for 100 range verification Press SHIFT then 5 Recalculate reading limits based on actual calibrator resistance values Model 2701 Service Manual Performance Verification 1 15 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 2701 INPUT and SENSE jacks to the calibrator as shown in Figure 1 6 8 Disable external sense on the calibrator Set the Model 2701 for the 1OOM range 10 Source nominal 1OOM resistance value and verify that the reading is within calcu lated limits for the range Figure 1 6 Connections for Model 2701 resistance verification 100 range SENSE INPUT HI HI Resistance Calibrator Model 2701 KEITHLEY INPUTS SHIFT EXIT ENTER INPUT Note Use shielded low thermal cables to HI minimize noise Disable calibrator SENSE LO external sense Table 1 6 Limits for resistance verification Nominal Nominal reading limits O Range resistance 1 year 18 to 28 Recalculated limits to 99 9880 to 100 01209 0 999894 to 1 000106kQ 9 99894 to 10 00106kQ 99 9890 to 100 01 10k 0 999890 to 1 0001 10MQ 9 99590 to 10 00410MQ 99 7970 to 100 2030MQ Enable O COMP offset compensated ohms when testing 100Q range Calculate limits bas
61. measured HI AND LO E See text Model 2701 Service Manual Calibration 2 21 After the last AC current calibration step the instrument will prompt you to enter 3Hz at IV RMS and with the following prompts e Low frequency cal Set the function generator to output a RMS sine wave Use the left and right arrow keys and the range keys to adjust the display to agree with the generator amplitude you measured previously then press ENTER e Frequency cal Set the function generator to output a 1V RMS IkHz sine wave Enter 1 000000KHz at the prompt then press ENTER Set the calibration dates then save calibration to complete the process Remote manufacturing calibration l 10 Install the shorted Model 7797 calibration board see Calibration card preparation earlier in this section in scanner card Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium Press and hold the OPEN key while turning on the power Enable calibration by sending the CODE command For example the default command is CAL PROT CODE KI002701 Initiate calibration by sending the following command CAL PROT INIT Calibrate step with the following command CAL PROT DC STEPO Perform the entire remote comprehensive calibration procedure discussed earlier in this section See Comprehensive calibration on page 2 5 Connect the function generator to the Model 2701 INPUT
62. such as a DC transfer stan dard and characterized resistors as long as that equipment has specifications at least as good as those listed in Table 2 1 Table 2 1 Recommended equipment for comprehensive calibration Fluke 5700A Calibrator AC voltage AC current DC voltage 1kHz 50kHz DC current 1kHz Resistance 10V 5ppm 10mV 710ppm 10mA 60ppm 100mA 190ppm 1kQ 12ppm 100V 7ppm 100mV 200ppm 100mA 70ppm 1A 690ppm 10kQ 1 1ppm 1V 82ppm 1A 110ppm 2A 670ppm 100kQ 13ppm 10 82ppm IMQ 18ppm 100V 90ppm 700V 85ppm 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 10 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 Model 2701 Service Manual 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 Model 2701 will not respond to any remote programming commands while the ABORT CAL message is displayed Front panel calibration Perform the steps in the following paragraphs in th
63. sure calibrator is set for LO normal current output 2 Calibrate each current step summarized in Table 2 5 For each step e Set the calibrator to the indicated DC current and make sure the unit is in OPERATE e Make sure the Model 2701 display indicates the correct calibration current e Press ENTER to complete each step e Allow the Model 2701 to finish each step NOTE Ifyou performing DC only calibration proceed to Setting calibration dates and saving calibration Table 2 5 DC current calibration summary Calibration step Allowable range 10 10 00000mA OmA to 100mA 100 0000mA 90mA to 110mA 1A 1 000000 0 9A to 11 Model 2701 Service Manual Calibration 2 11 AC voltage calibration Follow these steps for AC voltage calibration 1 Connect the calibrator to the Model 2701 INPUT HI and LO terminals as shown in Figure 2 4 Figure 2 4 Connections for AC volts calibration INPUT HI AC Voltage Calibrator Model 2701 OUTPUT INPUT LO OUTPUT LO 2 Perform the calibration steps summarized in Table 2 6 For each step Setthe calibrator to the indicated value and make sure the calibrator 1s 11 OPERATE e Press ENTER to complete each step Wait until the Model 2701 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 IkH
64. that the reference current for OHMS is generated by the Ohms I Source circuit For 4 wire ohms measurements SENSE LO 15 connected to 126 Signal switching and gain for ACV FREQ and ACA is done by the AC Switching amp Gain circuit which is primarily made up of K102 U102 U103 U105 U112 U118 U111 and 0110 Note that 0111 is used for frequency adjustment The states of these analog switches vary from unit to unit Multiplexer and A D converter 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 Model 2701 Service Manual Troubleshooting 4 11 Figure 4 3 Analog circuitry block diagram Front Terminals O S101 Figure 4 2 Q108 Q113 U163 U166 Scanner Outputs AMPS Current Shunts K103 R158 R205 R338 AC Switching amp Gain front Terminal fog wr Uta os K1
65. to the front panel input jacks before sending this command Example Perform short circuit calibration 10 Calibration Reference STEP2 Model 2701 Service Manual CALibration PROTected DC 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 calibration procedure Disconnect all cables and accessories from the input jacks before sending this command PROI DO STEP Perform open circuit calibration CALibration PROTected DC STEP3 Purpose Format Parameter Description Example 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 allowable range of the calibration voltage parameter is from 9 to 11 but 10 is recommended for best results 220 Program 10V step CALibration PROTected DC STEP4 Purpose Format Parameter 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 recommen
66. two serial ports DMA controller and general purpose I O lines U1 is the ARM processor memory IC while U12 provides Ethernet port I O buffering and drive capabilities 4 10 Troubleshooting Model 2701 Service Manual Analog circuitry Refer to Figure 4 3 for the following discussion on analog circuitry INPUT HI INPUT HI protection is provided by the SSP Solid State Protection circuit The SSP is primarily made up of Q101 and 0102 An overload condition opens 0101 and 0102 which disconnects 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 Divider 0114 and 0136 to switching circuit AMPS input The ACA or input signal is applied to the Current Shunt circuit which is made up of K103 R158 R205 and R338 For the 20mA DC range 5 10 R205 R338 R158 15 shunted across the input Relay K103 15 energized set state to select the shunts For all other DCA ranges and all ACA ranges 0 10 R158 is shunted across the input 103 reset The ACA signal is then sent to the AC Switching amp Gain circuit while the DCA signal is routed directly to the A D MUX amp Gain circuit Signal switching signal switching for DCV and OHMS is done by the DCV amp Ohms Switching circuit FETs 0113 0105 0104 and 0108 connect the DCV or ohms signal to the X1 buffer U113 Note
67. unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the DC current measurement function by pressing the DCI key Set the Model 2701 for the 20mA range Close Channel 21 by pressing the CLOSE key and keying in 121 5 Source positive and negative full scale currents for each of the ranges listed in Table 1 11 and verify that the readings for each range are within stated limits 6 Press the OPEN key to open Channel 21 Table 1 11 Plug in module DCI limits DCI range Applied DC current Reading limits 1 year 18 to 2870 20 0000mA 19 98840 to 20 01160mA 100 0000mA 99 8700 to 100 1300mA 1 000000A 0 999120 to 1 000880A 3 000000A 2 99628 to 3 00372A Source positive and negative currents with values shown Tf the Fluke 5725 amplifier is not available apply 2 2A from calibrator Reading limits for 2 2 input are 2 197240 to 2 202760 1 24 Performance Verification Model 2701 Service Manual Verifying AC current Check AC current accuracy by applying accurate AC voltage current at specific frequencies from the AC current calibrator to the Model 7700 input terminals and verifying that the dis played readings fall within specified limits Follow these steps to verify AC current Connect the Model 7700 CH21 H and L terminals to the calibrator as shown in
68. warm up for the minimum time specified by the manufacturer Line power The Model 2701 requires a line voltage of 100V 120V 220V 240V 10 and a line frequency of 45Hz to 66Hz or 360Hz to 440Hz Note that the line frequency is automatically sensed at power up but the line voltage must be manually set to either 100V 120V or 220V 240V as described in Section 3 Model 2701 Service Manual Calibration 23 Calibration considerations When performing the calibration procedures e Make sure that the equipment is properly warmed up and connected to the appropriate input jacks Also make sure that the correct front or rear terminals are selected with the INPUTS switch Make sure the calibrator is in OPERATE before you complete each calibration step e Always let the source signal settle before calibrating each point e error occurs during calibration the Model 2701 will generate an appropriate error message See Appendix B for more information WARNING Observe the following safety precautions when performing these tests Some of the procedures in this section may expose you to dangerous voltages Use standard safety precautions when such dangerous voltages are encountered to avoid personal injury or death caused by electric shock e For the front panel terminals only the maximum common mode volt age voltage between INPUT LO and chassis ground is 500V peak Exceeding this value may cause a breakdown in insulation creating
69. will be external to the Model 2701 to avoid card heating during calibration Model 7700 calibration NOTE Before calibrating the Model 7700 make sure that power has been removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibration procedure complete the procedure as quickly as possi ble to minimize card heating that could affect calibration accuracy Allow the Model 2701 to warm up for at least two hours Front panel Model 7700 calibration 1 Connect the Model 7700 to the Model 7797 Calibration System card see Calibration card connections above 2 With the power off install the Model 7700 7797 combination in Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium 3 Accurately measure and record the cold temperature of the Model 7700 card surface at the center of the card with an RTD sensor 4 Press and hold the Model 2701 OPEN key while turning on the power Model 2701 Service Manual Calibration 2 23 Press SHIFT then TEST then display TEST CALIB with the up or down range key Press ENTER select RUN then enter the appropriate calibration code default 002701 Using the up or down range key select CARD at the CAL RUN prompt then press ENTER Set the display value to the cold calibration temperature you measured in Step 3 then press ENTER to complete Model 7700 calibration Remote Model 7700 ca
70. year 18 to 28 1 000000A 0 99860 to 1 00140A 3A 3 00000A 2 9817 to 3 0183A f the Fluke 5725A amplifier is not available apply 2 2A from the calibrator Reading limits for 2 2A are 2 1949 2 2051A Model 2701 Service Manual Performance Verification 1 25 Verifying resistance Check resistance by connecting accurate resistance values to the Model 7700 and verifying that its resistance readings are within the specified limits CAUTION Do not apply more than 300V between plug in module INPUT or SENSE H and L terminal or between any adjacent channels or instrument dam age could occur Follow these steps to verify resistance accuracy 1 Using shielded Teflon or equivalent cables in a 4 wire configuration connect the Model 7700 CH1 H and L INPUT terminals and CH11 H and L SENSE terminals to the calibrator as shown in Figure 1 12 Figure 1 12 Connections for Model 7700 resistance verification 1009 ranges CH1 Sense F Model 7700 1 Resistance Calibrator eae SX S
71. zero error 100k 4 w zero error 10M 4 w sense lo zero error 4 w full scale error 10k 4 w full scale error 100k 4 w full scale error 1M 4 w full scale error 10M 4 w full scale error 10 adc zero error 100m adc zero error 10 adc full scale error 100m adc full scale error 1 adc full scale error Date of calibration not set Next date of calibration not set 100m vac dac error Model 2701 Service Manual Methods to detect and determine the nature of calibration errors are discussed in the follow ing paragraphs See the Model 2701 User s Manual for details on status register operation Model 2701 Service Manual Calibration Reference B 23 Table B 5 Continued Calibration error summary Error number and description vac dac error 10 vac dac error 100 vac dac error 100m vac zero error 100m vac full scale error vac zero error vac full scale error vac noise error 10 vac zero error 10 vac full scale error 10 vac noise error 100 vac zero error 100 vac full scale error 750 vac zero error 750 vac full scale error 750 vac noise error Post filter offset error aac zero error aac full scale error 3 aac Zero error 3 aac full scale error Input time constant error Frequency gain error Ohm Ioff Ocomp FS error Ohm Ioff Ocomp FS error Temperature Cold Cal error Calibration data invalid AC calibration dat
72. 0 0000V 99 910 to 100 090V 99 830 to 100 170V 300 000V 299 60 to 300 40V 299 27 to 300 73V f the 5725A amplifier is not available change the 300V 50kHz step to 220V 50kHz Read ing limits for 220V 50kHz 219 36 to 220 64 V 1 22 Performance Verification Model 2701 Service Manual Verifying DC current Check DC current accuracy by applying accurate DC currents from the DC current calibra tor to the input terminals of the Model 7700 and verifying that the displayed readings fall within specified limits Follow these steps to verify DC current accuracy 1 Connect the Model 7700 CH21 and L terminals to the calibrator as shown in Figure 1 10 Figure 1 10 Connections for Model 7700 DC current verification Model 7700 Calibrator Output DC Current n aooOooooodoo Output HI LO Note Be sure calibrator is set for normal current output CH21 Model 2701 Service Manual Performance Verification 1 23 2 Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the
73. 000V and 3A RMS Noise 12 MRR 2 Add the following to ppm of range uncertainty 100mV 15ppm 1V and 100V 2ppm 1000 30ppm Rate Filter Readings s Digits 10V Range 3 C 20m and lippa A MOD prn 10 50 0 1 0 08 6 5 lt 2 5 HV 110 140 dB 3 2 measured with 10MQ input resistance DMM gt 10GQ DMM on 10M 100MQ ranges 1 Off 15 12 6 5 6yV 90dB 140 dB 4 Relative to calibration accuracy 0 1 Off 500 400 9 5 lt 40 pV 80 dB 5 Forsignallevels gt 500V add 0 02ppm V uncertainty for portion exceeding 500V 0 006 Off 3000 3000 45 lt 300 80 6 Specifications for 4 wire 1000 with offset compensation on with 77xx plug in modules with Lsync and with offset compensation on OPEN VOLTAGE is 12 8V For 2 wire add 1 00 to 0 002 Off 3500 3500 3 5 lt 1mV 60dB ppm of range uncertainty 7 Must have 1096 matching oflead resistance in Input HI and LO 8 Add the following to ppm of reading uncertainty when using plug in modules DC MEASUREMENT CHARACTERISTICS Be RU DC Volts Modules 220ppm 2200 ppm A D LINEARITY 2 f readi 1 f 7701 7703 7707 7709 Modules 10 100 1000 ppm 1 10 20 ti Tange 7706 7708 Modules 5 ppm 50ppm 500ppm 5000ppm 5 INPUT IMPEDANCE 100mV 10V Ranges Selectable gt 10GQ with lt 400pF or 10MQ 1 9 Add L0V when 2 i modules m
74. 01 FRE 77 S xi MUX amp ADC INPUT SSP DCV Switching Buffer Circuitry 1 Scanner Outputs HI Q101 Q102 OHMS Q104 Q105 0113 BUFCOM 0129 0132 0165 1 1 120 CR114 DCV Divider DCV 100 R117 Q109 Q114 Q136 X1 Ohms I Source Buffer Q119 Q123 Q124 Q125 Q126 U167 U123 0133 Front Terminals 5101 Protection SENSE R120 R121 R124 Scanner Outputs HI R125 Q107 Q148 VR119 VR120 Front Terminals 5101 Protection SENSE R132 R139 R148 Scanner Outputs LO R163 Q122 Q135 VR119 VR120 Scanner Outputs Slot Scanner Control Inputs Solid State Protection Scanner Inputs 4 12 Troubleshooting Model 2701 Service Manual Ohms open lead sense detection There are two types of open sense lead detect Figure 4 4 The first is for the INPUT HI and INPUT LO leads For these leads the open sense detection is implemented in hardware A comparator circuit monitors the voltage at the INPUT HI lead output and will trip the OVLD detect circuit when the voltage level exceeds an appropriate value for the particular range This circuit operates because the INPUT HI lead output is connected to a current source If the lead is disconnected it will quickly charge the output to the current source maximum voltage level This level depends on the range and 15 documented in the specifications in Appendix A When the open
75. 01 temperature function for units and RTD temperature sensor 0 0 00385 as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C Press ENTER and note the unit displays the sensor type SENS TCOUPLE Using the cursor and range keys set the display as follows SENS 4W RTD Press ENTER and note the unit displays 100 Using the cursor and range keys set the unit for the following display TYPE PT385 f Press ENTER to complete the temperature configuration process aag 3 Select the temperature function by pressing the TEMP key Set the decade resistance box to each of the values shown in Table 1 8 and verify that the temperature readings are within the required limits Table 1 8 Four wire RTD temperature verification reading limits Applied resistance Reading limits 1 year 18 C to 28 C 22 800 190 06 to 189 94 C 100 000 0 06 to 0 06 313 590 599 94 to 600 06 C Based amp 0 00385 See text 1 18 Performance Verification Model 2701 Service Manual Verifying frequency Follow the steps below to verify the Model 2701 frequency function 1 Connect the function generator to the Model 2701 INPUT Jacks See Figure 1 7 Be sure the INPUTS switch is in the FRONT position Set the function generator to output a IKHz 1V RMS sine wave 3 Select the Model 2701 frequency function by pressing the FREQ key Verify that the Model 2701 frequenc
76. 07 TE LBS 1019902 TAS 2101 0950 POWER MODULE ASSEMBLY N28 319 001 2 REQ D 15 Oc SEA DE AVE Wr 2 REQ D IN LBS FE OUT SUR AT NUMBER DESCRIPTION x T AN NM LII 2701 302 AN CHASSIS oe 428 319 FOOT 270 2101 052 FP Chassis Assembly 5 51 CABLE CLAMP MODEL NEXT ASSEMBLY NEXT PROCESS STEP 007 520 ON ano sc 96 er SCALE THIS ORAWING aspen sene ra 6 321 PHIL FLAT HEAD SCREW DO NOT SCALE THIS DRAWING UNLESS OTHERWISE SPECIFIED DATE 2 S asa se Misit KEPNUT BA BATTERY ETEY ime tne muc Vo ZX WC 682 EET I sunac max SF FINISH Aquas LTR ECA NO REVISION ENG DATE Was 4 40X5 16PPH ST DETAIL A PROPERLY INSTALLED 6 32X1 16PFH Del Rev From Parts Dr pee TOP VIEW PUSH ROD CE REO DICO EN din il E SWITCH INSTALL PUSH ROD PUSH SWIICH SHAFT DOWN LNTO ROD ANTE BOT POMS OUT USH ROD PRESS UPWARD PUSHROD WHILE PUSHING SWITCH SHAFI DOWN POWER MODULE DEIAIL B TRANSFORMER WIRING PLACE CABLE TIE 2101 004 FAN ASSEMBLY WHT AROUND WIRES 6 32X1 2PPHSEM 4 REQ D 5 IN LBS AIR FLOW DIRECTION J 104 313 PUSH ROD SEE DETAIL A O Se2KEP NUT C20 POWER MODULE 2101 051 MODULE CHASSIS ASSEMBLY DRESS CA
77. 100 391 100 R 418 1K R 375 10 R 418 100 R 375 1 1M R 418 732K R 418 1 5K 418 49 9 418 1 5 246 1 418 499 R 475 1 R 391 1K R 418 1K R 418 4 75K R 456 100K R 456 1K R 418 1M R 418 10K R 418 49 9 R 418 301 R 391 49 9 R 391 3 01K R 418 100K R 391 6 98K R 443 7 06K R 391 2K R 449 70K R 418 30 1K R 246 10 R 418 4 75K R 418 2 21K Model 2701 Service Manual Table 6 1 Continued Model 2701 motherboard parts list Circuit designation R215 R216 R221 R222 R223 R225 R226 R228 R237 R252 R23 R230 R232 R233 R236 R234 R235 R245 R250 R255 R239 R242 R24 R240 R241 R243 R246 R247 R248 R251 R249 R259 R320 R273 R274 R307 R314 R277 R278 R281 R279 R289 296 R299 R305 R319 R342 R390 R287 R316 R317 R349 R290 R302 R303 R383 R304 R308 R309 R310 R311 R312 R313 R315 R318 R323 R341 R350 RES 4 42K 1 1 4W METAL FILM RES 2 21K 1 1 4W METAL FILM RES 2 21K 1 1 4W METAL FILM RES 470 5 125MW METAL FILM RES 475 1 100MW THICK FILM RES 249 1 100MW THICK FILM RES 4 75 1 100MW THICK FILM RES 49 9K 1 100MW THICK FILM RES 100 1 1 4W METAL FILM RES 5 11K 1 100MW THICK FILM RES 475 1 100MW THICK FILM RES 2 2 5 125MW METAL FILM RES 200 1 100MW THICK FILM RES 2 2 5 125MW METAL FILM RES 34K 1 100MW THICK FILM RES 22 1 1 100MW THICK FILM RES 82 5 1 100MW THICK FILM RES 34K 1 100MW
78. 1006 J1008 J1018 J1010 J1012 J1014 J1017 J2 J3 Model 2701 Service Manual CAP 1000pF 20 50V CERAMIC CAP 22PF 10 100V CERAMIC CAP 100UF 20 100V CAP 47P 5 100V CERAMIC CAP 01uF 20 50V CERAMIC CAP 47UF 20 25V ALUM ELEC CAP 1UF 2096 50V CERAMIC CAP 1UF 2096 50V CERAMIC CAP 47PF 10 100V CERAMIC CAP 01uF 20 50V CERAMIC CAP 33F 30 5 5 V GOLD CAPACITOR CAP 1UF 2096 50V CERAMIC CAP 01uF 20 50V CERAMIC CAP 100UF 20 16V TANTALUM CAP 3300P 10 500V CERAMIC CAP 2200P 596 50V CERRAMIC CAP 01uF 20 50V CERAMIC CAP 100U 20 16V ALUM ELEC CAP 100P 10 100V CERAMIC CAP 1UF 2096 50V CERAMIC DIODE DUAL SWITCHING BAV99L DIODE BRIDGE DF01 DIODE BRIDGE PE05 CASE KBU DIODE DUAL HSM 2822T31 DIODE DUAL COMMON ANODE BAW56LT2 DIODE SWITCHING MMBD914 DIODE MBR5130LT3 PILOT LIG HSMH T400 LED CONN HEADER STRAIGHT SOLDER PIN CONN BERG 4 PIN CONN MICRODIN W GND FINGERS LATCHING HEADER FRICTON SGL ROW CONN FEMALE 8 PIN CONN HEADER STRAIGHT SOLDER PIN CONN HEADER STRAIGHT SOLDER PIN CONN MALE 3 PIN RT ANGLE CONNECTOR HEADER STRAIGHT SOLDER PIN CONN MODULAR JACK LED 3 Keithley part no C 418 1000P C 451 22P C 573 100 C 465 47P C 418 01 C 3 14 47 C 418 1 C 418 1 C 451 47P C 418 01 C 625 33F C 418 1 C 418 01 C 504 100 C 497 3300P C 528 2200P C 418 01 C 547 100 C 451 100P C
79. 101 0102 K101 102 pin8 pin9 9 8 16 pin1 pin 16 K101 and K102 reset states Pin 8 switched to Pin 9 Pin 3 switched to Pin 2 K101 and K102 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Table 4 8 02 signal switching 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 4 16 Troubleshooting Model 2701 Service Manual Table 4 9 24 signal switching 0102 0114 0136 0109 101 0113 0105 0104 0108 K101 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Table 4 10 22 04 reference switching Table 4 11 DCA signal switching K103 set states Pin 8 0 7 Pin 3 to 4 K103 reset states Pin 8 to 9 Pin 3 to 2 Model 2701 Service Manual Troubleshooting 4 17 Table 4 12 ACA signal switching U105 U105 U111 U105 U103 U103 Range K103 pin 16 pin 1 pin 16 pin 8 pin 16 pin 1 1 Reset ON ON OFF OFF OFF OFF 3A Reset ON ON ON OFF OFF OFF K103 set states Pin 8 to 7 Pin 3 to 4 103 reset states Pin 8 to 9 Pin 3 to 2 Table 4 13 through Table 4 17 can be used to trace the analog signal through the A D multi plexer 0163 to the final amplifier stage These tables show the MUX lines 53 54 56 57 that are selected for measurement during the SIGNAL phase of the multiplexing cycle Also included are switching states of analog switches U129 t
80. 2 Sendthe following command CAL PROT DC STEPT 3 After the Model 2701 completes this step remove the low thermal short and then send this command CAL PROT DC STEP2 NOTE sure to minimize movement near front Input terminals Excessive movements cause capacitive coupling errors which could affect calibration accuracy DC voltage calibration After the front panel short and open steps perform the following 1 Connect the calibrator to the Model 2701 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 8 For each step Setthe 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 you are using a different calibration voltage e Wait until the Model 2701 completes each step before continuing Model 2701 Service Manual Calibration 2 15 NOTE Ensure the calibrator has settled to the final value You c
81. 238mm wide x 370mm deep 4 125 in x 9 375 in x 14 563 in SHIPPING WEIGHT 4 75kg 10 Ibs DIGITAL I O 2 inputs 1 for triggering and 1 for hardware interlock 5 outputs 4 for Reading Limits and 1 for Master Limit Outputs are TTL compatible or can sink 250mA diode clamped to 40V TRIGGERING AND MEMORY Window Filter Sensitivity 0 0196 0 1 1 10 or Full scale of range Reading Hold Sensitivity 0 01 0 1 1 or 10 of reading Trigger Delay 0 to 99 hrs 1ms step size External Trigger Delay 1ms Memory Size 450 000 readings MATH FUNCTIONS Rel Min Max Average Std Dev Peak to Peak of stored reading Limit Test 1 x and mX b with user defined units displayed REMOTE INTERFACE Ethernet RJ 45 connector TCP IP Auto sensed 10bT or 100bTX and RS 232C SCPI Standard Commands for Programmable Instruments ACCESSORIES SUPPLIED Model 1751 Safety Test Leads Product Information CD ROM Model 2701 Networking Manual Model 2701 Getting Started Foldout 3m cross over ethernet cable Software CD ROM with IVI VISA drivers for VB LabVIEW TestPoint and LabWindows CVI and free runtime startup software ACCESSORIES AVAILABLE 77XX Modules Extended Warranty ExceLINX 1A Excel add in datalogger software TestPoint Software Development Package IP CONFIGURATION Static or DHCP PASSWORD PROTECTION 11 characters SOFTWARE Windows 98 NT 2000 ME and XP compatible Internet Explorer 5
82. 29 IC DUAL BUFFER W OPEN DRAIN OUTPUT 1479 0141 IC PRECISION REFERENCE LM399 196 600 0142 NE5534D 802 0144 5 3 04 LOW DROPOUT REGULATOR IC 1519 U148 U153 IC QUAD 2 IN NOR 74 2 809 0149 NCHAN LAT DMOS SD5400CY 1 893 U15 IC 3 3V RS232 TRANSCEIVER IC 1420 U150 IC OPTOCOUPLER 2611 IC 690 U154 IC QUAD D FLIP FLOP W CLK RESET IC 923 74HC175 U155 IC OPTOCOUPLER 2601 IC 239 U16 IC DUAL SMART BATT BACK UP IC 1528 REG U163 IC 8 CHAN ANA MULTIPLEXER DG408DY 844 U165 PROGRAM 2000 802A02 U168 IC DUAL D TYPE F F 74HC74 IC 773 017 IC HEX SCHMITT INVERTER IC 1368 U175 IC DUAL HIGH CMR SPEED OPTO IC 588 HCPL 2631 U18 IC 1 5A SWITCHING REGULATOR IC 1426 U19 INTEGRATED CIRCUIT SMT IC 1532 U2 U21 U22 U26 U28 U31 U34 U801 U803 UHS CONFIGURABLE 2 INPUT GATE IC 1492 U23 U24 IC PROTECTED QUAD POWER DRIVERS IC 1212 6 10 Replaceable Parts Model 2701 Service Manual Table 6 1 Continued Model 2701 motherboard parts list Circuit designation U25 IC 2 5V 1 5A SWITCHING REGULATOR IC 1505 U27 INTERGRATED CIRCUIT SMT IC 1423 U3 U11 IC 512K X 32 X 4 BANKS SDRAM LSI 266 2 U35 UHS CONFIGURABLE 2 INPUT GATE 1 1493 04 IC LITHIUM ION BATTERY CHARGER IC 1530 0427 INTEGRATED CIRCUIT SMT IC 1529 U5 OCTAL BUFFERS DRIVERS 3 ST OUT IC 1488 Up IC 3V ADV BLOCK FLASH LSI 257 1 U7 INTEGRATED CIRCUIT SMT IC 1524 08 IC
83. 3 6 LE REQ DIC LBS 2100 319 SWITCH ROD RECOMMENDED PROCESS DEPRESS SWITCH ON DIGITAL BOARD SEE DETAIL A ALIGN OPENING IN BOTTOM OF ROD OVER SWITCH SHAFT AND EASE ROD DOWN 2 PUSHROD COMPLETELY ONTO SWITCH SHAFT 2 2101 2701 055 Final Chassis Assembly 210 308 CER _____ LL Te o C TE 428 3030 1 REAR BEZEL USED ON 2 L oe sen rus oes nmt i Eu SEWS SCREW KETTHILEY first xem me PR L go DoD l RECOMMENDED PROCEDURE BEERER EN PTI TESTIS TURN UNIT ON LISTEN FOR 2 VERIFY READINGS LOADING FPGA LOAD ETHRNET LOADING MAIN DISPLAYS ALL SEGMENTS tT HRNE XXX XXX 2 XXX 428 3029 HANDLE Ell COMER 4 40 1 4 NOTE UO dE E on UNIT 15 BE SHIPPED WITH GREEN MASK IHE LENS PLACE CERTIFICATE OF CALIBRATION TOP OF UNIT THEN PLACE INTO PO 14 4 CHIPLOC BAG AND SEND WITH W O SHIPPING KIT ITEMS TO AUDIT CALL STOCKROOM FOR WORK ORDER SHIPPING KIT BEFORE SENDING TO AUDIT DESCRIPTION REMOVE FUSE HOLDER FROM UNIT PUL FUSE BLOCK SECTION OUT PART NUMBER 70 440 CHASSIS ASSEMBLY AND ROTATE UNTIL PROPER CHIPLOC BAG VOLTAGES WILL BE
84. 4 R6 R46 R131 R227 R229 R276 R282 R344 R345 R5 R50 R52 R58 R63 R65 R 144 R84 R85 R55 R66 R67 R7 R72 R75 R78 R80 R81 R130 R154 R177 R183 R186 R8 R13 R21 R25 R33 R35 R41 R45 R47 R49 R86 R82 R83 R92 R94 R155 R162 R203 R207 R9 R10 R34 R91 R96 RV1 RV101 RV102 RV104 RV105 5101 5 101 SA102 SA103 TP102 TP105 TP107 TP103 TP104 DGND U1 U10 U101 U102 U118 U103 U105 U111 U129 U104 U106 U109 U121 U130 U 134 U107 U108 U110 Model 2701 Service Manual RES NET 50K 1 5W THICK FILM RESISTOR NETWORK 10K 10K RES NET 5K 1 668A RES IK 1 100MW THICK FILM RES 10 1 100MW THICK FILM RES IK 1 100MW THICK FILM RES 75 1 100MW THICK FILM RES 10 1 100MW THICK FILM RES 10 10 100MW THICK FILM RES 5 11K 1 100MW THICK FILM RES 0499 1 100MW THICK FILM RES 5 49K 1 100MW THICK FILM RES 12 4 10 100MW THICK FILM RES CAP NET 50 OHM 10 100P 20 IW RES 3 01K 1 100MW THICK FILM RES 100 1 100MW THICK FILM RES 4 75 1 100MW THICK FILM RES 4 75 1 100MW THICK FILM RES 200 1 100MW THICK FILM RES 56 2 1 THICK FILM RES 56 2 1 THICK FILM TRANSIENT VOLTAGE SUPPRESSOR VAR 576V METAL OXIDE 5101 40 BIDIRECTIONAL TRANSIENT VOLT SUPPRESSOR SWITCH PUSHBUTTON 8 POLE SURGE ARRESTOR CG3 1 5AL SURGE ARRESTOR CONN TEST POINT SURFACE MOUNT PCB TEST POINT IC COLDFIRE MICROPROCESSOR IC 32 BIT RISC PROCESSOR IC VOLTAGE R
85. 418 1 RF 82 RF 52 48 95 98 RF 83 RF 115 PL 92 1 CS 368 26 CS 724 4 CS 792 CS 724 3 CS 612 8 CS 368 20 CS 368 16 CS 1138 1 CS 368 14 CS 1150 1 Model 2701 Service Manual Table 6 1 Continued Model 2701 motherboard parts list Circuit designation 14 J5 16 7 101 103 1 107 1 108 1 109 L16 L23 L116 L27 L1 L7 L9 L14 L102 L104 L801 L24 L25 L105 L106 L501 L15 L8 L26 1 51 M315 M42 01 0127 0131 0133 011 013 0101 0102 Q104 0106 0107 0114 0120 0122 Q126 0105 0108 0109 0113 0119 0135 0137 0148 014 02 04 0111 0116 0129 0144 0146 08 09 Q3 05 0110 0112 0115 0118 0130 0143 Q145 06 07 R1 R60 R101 R102 R103 R107 R108 R113 R120 R121 R124 R125 R104 R105 R106 R109 R134 R11 R12 R36 R37 R331 R332 R110 R133 R405 R112 R116 R114 R2 R115 R175 R176 R324 R117 Replaceable Parts 6 5 CONN RT ANGLE FEMALE 9 PIN CONN D SUB MALE BOARDLOCK TYPE LATCHING HEADER 5 PIN CONN BERG RELAY MINATURE DPDT TQ2E L2 5V EA2 5TNJ CHOKE DATA LINE FILTER CHOKE EMI CHOKE 22UH FERRITE CHIP 600 OHM BLM32A07 FERRITE CHIP 600 OHM BLM32A07 CHOKE 22U HIGH CURRENT POWER IND BEEPER 5V QMX 05 WIRE ROUTING CABLE CLAMP FOOT DOME TRANS N MOSFET VN0605T TRANS MOSFET 25 1412 TRANS N CHANNEL JFET SNJ132199 TRANS N CHANNEL JFET SST4118 TRANS P CHANNEL JFET J270 J177 TRANS N CHANNEL JFET SNJ132199 TRANS P CHAN MOSFET TP0610T TRANS
86. 44 Fax 01 820 30 81 1FL 85 Po Ai Street Hsinchu Taiwan R O C 886 3 572 9077 Fax 886 3 572 9031 Copyright 2001 Keithley Instruments Inc Printed in the U S A 4 02
87. 6 16V ALUM ELEC CAP 100PF 5 100V CERAMIC CAP 2200P 10 100V CERAMIC 22U 20 25V TANTALUM CAP 1UF 2096 50V CERAMIC CAP 100PF 5 100V CERAMIC CAP 01uF 20 50V CERAMIC CAP 1UF 2096 50V CERAMIC CAP 10U 2096 16V TANTALUM CAP 4700PF 20 50V CERAMIC CAP 1UF 20 50V CERAMIC CAP 1UF 2096 50V CERAMIC CAP 15UF 20 50V CERAMIC CAP 100 20 16V TANTALUM C 403 100 C 513 22 C 512 15P C 436 1 C 480 2 2 C 465 47P C 514 01 451 1000 482 33 C 465 270P C 451 47P 451 1000 C 418 1 C 595 1000 C 451 220P C 465 33P 465 47 C 418 1 C 418 1000P C 488 1000 C 418 1 C 451 47P C 592 3300 C 465 100P C 430 2200P C 535 22 C 418 1 C 465 100P C 418 01 C 418 1 C 546 10 C 418 4700P C 519 1 C 418 1 C 418 15 C 546 10 6 4 Replaceable Parts Table 6 1 Continued Model 2701 motherboard parts list Circuit designation 244 267 282 252 C253 C255 C262 C268 C468 C283 C284 C5 C192 C200 C242 C243 C293 C294 C30 C33 C35 C38 C41 C42 C47 C54 C56 C58 C40 C413 C46 C414 C193 C228 C231 C236 C239 C241 C43 C44 C60 C62 C64 C65 C67 C77 C86 C88 C89 C61 C63 C73 C76 C189 C215 C246 C249 C66 C205 C68 C69 C208 C7 C9 C12 C15 C26 C28 C29 C34 C55 C59 C70 C211 C71 C212 C91 C101 C107 C116 C118 C122 C124 C125 CRI CR2 CR5 CR6 CR8 CR115 CR117 CR102 CR103 CR104 CR106 CR110 CR118 CR3 CRA CR13 CR7 CR114 CR119 CR16 CR9 CR12 DS101 DS102 J1 J1002 J
88. 6 2017 5014 915 4012 013 59010011 Q9 ij H Faso 9 lj de lj lj l l li 026 Q27 024 025 022 Q23 020 921 b T E S E EE E E 2 T T aie ND R21 R22 d R19 R20 KR R17 R18 R15 R16 TP3 1 1 1 1 7 1 co d Bb pge poe poer cits RSS R33 R34 R29 827 s R31 R32 C14 R14 R58 8 Mad _ AR 8 PEBE cR25 Ld 07 C19 R110 C18 R109 CLT R108 c5 du EC 948 z m Hd BH En wow o R54 R52 R51R50 R49 RAS R47 mn Ey CR21 EI CR29 25 52 d oo 150 Cl gt Lj iC 1 m T iH Bag R42 R41 R40 R39 R38 R37 R36 R35 ze s E Er E CR CRL4 mH Q44 Q42 04 040 rt n O rT Fr TT FT TY Fr LC LC LC LC LC LC LC LC LC LC LC LC i E OO X qu t 40 4 HO d NOTE FOR COMPONENT INFORMATION 5 PRODUOGI SECONDARY SIDE COMPONENTS SIDE O1 a x DO NOI POPULAIE x SMI Pe PPC D UNLESS O1HERWISE SPECIFIED DATE SCALE due St DIMENSIONS ARE IN INCHES 2 15 99 3 4 COMPONENT LAYOUT I du O APPR DS 20 CHANNEL SCANNER CARD LAND ORO 241355 XXX F 605 XCLUDES FINISHED HOLE SIZE 2 d 2 3 5
89. 6 C256 C257 C263 C269 CAP 1UF 20 50V CERAMIC C 418 1 C104 C105 C106 C108 C109 C110 C226 C254 C112 C248 C113 C114 C119 C126 C115 C120 C186 C188 C121 C134 C140 C181 C251 C265 C123 C245 C127 C130 C133 C135 C136 C138 C139 C142 C131 C148 C132 C137 C141 C158 C176 C195 C219 C220 C222 C261 C143 C144 C151 C159 C160 C258 C260 C145 C240 C146 C147 C149 C152 C155 C161 C170 C172 C174 C150 C218 C285 C286 C288 C289 C39 C412 C156 C273 C274 C281 C157 C171 C177 C175 C209 C178 C180 C182 C185 C187 C194 C179 C266 C190 C247 C259 C264 197 199 201 204 206 210 213 216 2 4 45 72 87 90 217 229 235 207 214 221 223 225 227 232 234 237 250 230 238 100UF 20 63V ALUM ELEC 22UF 20 400V FILM CAP 15 1 100V CERAMIC CAP 1UF 20 100V CERAMIC 2 2UF 20 63V POLYCARB CAP 47 5 100V CERAMIC CAP 01 596 50V NPO CAP 1000P 10 100V CERAMIC CAP 33UF 20 63V POLYCARBONATE CAP 270PF 5 100V CERAMIC 47 10 100V CERAMIC CAP 1000P 10 100V CERAMIC CAP 1UF 2096 50V CERAMIC 10000 2096 35 ALUM ELEC CAP 220PF 10 100V CERAMIC CAP 33PF 5 100V CERAMIC CAP 47 5 100V CERAMIC CAP 1UF 2096 50V CERAMIC CAP 1000pF 2096 50V CERAMIC CAP 1000UF 20 16V ALUMINUM CAP 1UF 2096 50V CERAMIC CAP 47 10 100V CERAMIC CAP 3300U 209
90. 8 R209 R211 R214 R218 R220 R244 R392 R396 R212 R217 R39 R40 RES 15K 1 1 4W METAL FILM RES 73 2K 1 100MW THICK FILM RES 475 1 1 4W METAL FILM RES 215 1 100MW THICK FILM RES 24K 5 1W 200V THICK FILM RES 33 2K 1 100MW THICK FILM RES 100K 1 1 4W METAL FILM RES 100 1 1 4W METAL FILM RES IK 1 100MW THICK FILM RES 10 5 125MW METAL FILM RES 100 1 100MW THICK FILM RES 1 1M 5 125MW METAL FILM RES 732K 1 100MW THICK FILM RES 1 5K 1 100MW THICK FILM RES 49 9K 1 1000MW THICK FILM RES 1 5K 1 100MW THICK FILM RES NET 3 6K MICRO DIVIDER RES 499 1 100MW THICK FILM RES 1 1 3W RES 1K 1 1 4W METAL FILM RES IK 1 100MW THICK FILM RES 4 75 1 100MW THICK FILM RES 100K 1 125W THIN FILM RES IK 1 125W THIN FILM RES 1 100MW THICK FILM RES 10K 1 100MW THICK FILM RES 49 9 1 100MW THICK FILM RES 301 1 100MW THICK FILM RES 49 9 1 1 4W METAL FILM RES 3 01K 1 1 4W METAL FILM RES 100 1 100MW THICK FILM RES 6 98 1 1 4W METAL FILM RES 7 06K 1 125W METAL FILM RES 2K 1 1 4W METAL FILM RES 70K 1 3W 300V METAL FOIL RES 30 1K 1 1000MW THICK FILM RES 10 5 1 8W METAL FILM RES 4 75 1 100MW THICK FILM RES 2 21 1 100MW THICK FILM Model 2701 Service Manual Keithley part no 391 15 418 73 2 391 475 418 215 R 437 24K R 418 33 2K 391
91. BLE UNDER TRANSFORMER lose x Ie qu P PHSEM to REO DIC oo PARI NUMBER QTY DESCR LP PON TR 361 TRANSFORMER EI SEE DETAIL B FOR WR s E 1010 LL POWER NODIERASS IS ASSEWBLY _ e 01 040 EM EXON Jum EMIL 2101 040 FRONT PANEL ASSEMBLY 270 2101 053 Tech Chassis Assembly 1 ABLE CLAM Te 101 090 mp EAN T MODEL NEXT ASSEMBLY NEXT PROCESS STEP 4 40X1 4PFHUC PHIL FLAT HEAD UNDER CUT SCREW USED ON T T OPER PHIL HEAD SCREW DIMENSIONAL TOLERANCES TITLE TRANSFORMER __ BE HOE SEALE THIS DANONE qu Md HE SOME Front Panel Card Cage 06 3201 1 2PPHSEV PHIL PAN HEAD SENS SCREW 6 3211 2PPHSEN 0 KEITHLEY ting Wm ust ers 704 313A PUSH ROD e 0 32KEPNUT oa KEPNUT x SUA wax 3 REVISION eae s TRANSFORMER WIRES 5 PIN BATTERY WIRES 21321 Released 16 12 02 21535 2101 100 Was Rev B BNET 21551 2101 100 1 Was Rev ST 9 21 02 PIN 21568 2101 100C2 Was Rev C 57 10721702 27687 2101 100C3 Was Rev C2 11 5 02 FAN WIRES 3 s 21849 2101 100 Was 2701 100C3 2 503 ll Nog TRANSFORMER WIRES 4 PIN v AMA AMA AN 2101 100 016 BOARD ASSEMBLY SEE DETAIL A FOR WIRING PIN 1 FROM BACKPLANE si 6 32YIPPHSEM CIO IN LBS WIRE ASSE
92. C 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 SAMPIe COUNt and READ bus commands Calibration Reference 2 Calibration Reference Model 2701 Service Manual Introduction This appendix contains detailed information about the various Model 2701 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 2701 User s Manual Command summary Table B 1 summarizes Model 2701 calibration commands Table B 1 Remote calibration command summary CALibration Calibration root command PROTected commands in this subsystem are protected by the calibration lock CODE up to 8 char string COUNt INITiate LOCK LOCK DATE year month day DATE NDUE year month day NDUE DATA DC STEPO STEPI 5 2 STEP3 lt NRf gt lt NRf gt STEP5 lt NRf gt STEP6 lt NRf gt STEP7 lt NRf gt 5 8 lt NRf gt except queries and CODE Calibration code or password default KI002701 Request the number of times the unit has been calibrated Initiate calibration Lock out calibration opposite of enabling cal with CODE
93. C1 C9 C10 C11 C14 C15 C22 C4 C16 C17 C18 C19 C21 C25 C26 C23 C24 C15 C2 C6 C7 C8 C12 C13 C20 C27 C28 C31 C29 C32 C33 C34 C30 CR1 CR22 CR23 CR24 CR26 CR27 CR2 CR21 CR25 F1 F2 J1 K1 K21 K24 K25 K26 K27 K22 K23 Q1 Q2 Q4 Q3 Q6 Q49 Q50 Q34 36 38 40 42 44 46 7 Q35 37 39 41 43 45 47 48 Q5 Q8 10 12 14 16 18 20 22 24 26 28 30 32 Q9 11 13 15 17 19 21 23 25 27 29 31 33 R10 R11 R12 R108 R109 R110 R111 R3 R150 R13 R14 R15 R54 R58 R59 R2 R4 R5 R6 R7 R8 R9 R55 R56 R57 R60 R61 R62 R63 R64 R65 R66 R67 R68 R69 R70 R71 TE101 TE110 TE122 TE 121 U1 U2 U3 U4 U8 U11 U12 U13 U15 U17 U18 U14 Replaceable Parts 6 13 CAP 0 1UF 20 50V CERAMIC CAP 2200 20 10V TANTALUM CAP 47 5 100V CERAMIC CAP 0 1UF 2096 50V CERAMIC CAP 47 5 100V CERAMIC CAP 4 7U 10 35V TANTALUM DIODE DUAL SWITCHING BAV99L DIODE SWITCHING MMBD914 DIODE DUAL SWITCHING BAV99L FUSE 3A CONN RT ANGLE DUAL ROW RECEPT SINGLE COIL LATCH RELAY NON LATCHING RELAY N CHANNEL P CHANNEL POWER MOSFET TRANS PNP SILICON TRANS NPN SILICON TRANS PNP SILICON TRANS NPN SILICON P CHANNEL TMOSFET TRANS PNP SILICON TRANS NPN SILICON RES 69 8K 1 1W THICK FILM RES 4 7K 5 125MW METAL FILM RES IK 1 100MW THICK FILM RES 3 01K 1 125MW METAL FILM RES 4 22K 1 125MW METAL FILM RES 10K 1 100MW THICK FILM RES 2 21K 1 125MW METAL FILM RES IK 5 125MW METAL FILM RES IK
94. C66 2 5 205 1 8VD C214 37V CR115 CR117 C104 15V CR102 C148 15 102 131 5V SVRL 5V2 C146 18V CR102 C148 18V CR102 C131 Display board Display board components are shown in the digital circuitry block diagram in Figure 4 2 Microcontroller 0401 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 Model 2701 Service Manual Troubleshooting 4 7 Figure 4 2 Digital circuitry block diagram Li lon Battery Battery Control Charger U4 U16 Real Time Clock SDRAM U7 Analog Circuitry Display Board MCF5407 O Display re 7 05401 See Figure 4 3 U 50 MHz XTAL U13 1 U21 ae RS 232 RS 232 015 K Port TX FPGA Digital I O x Digital I O U9 U23 U24 Port Trigger Link Trigger Link U14 020 Connector c Ethernet SDRAM d Interface 10 100 BaseT Ethernet Port U11 U12 U10 4 8 Troubleshooting Model 2701 Service Manual Display 05401 is
95. CK Lock out calibration 6 Calibration Reference Model 2701 Service Manual CALibration PROTected L 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 2701 on calibration locked unlocked state Calibration must be enabled sending the CODE command before calibration can be performed Example CAL PROT LOCK Request cal lock state CALibration PROTected SAVE Purpose To save calibration constants in EEROM after the calibration procedure Format cal prot save Parameter None Description The SAVE command stores internally calculated calibration constants derived during both comprehensive and manufacturing calibration in EEROM is non volatile memory Calibration constants will be retained indefinitely once saved Generally SAVE 15 sent after all other calibration 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 Model 2701 Service Manual Calibration Reference B 7 DATE CALibration PROTected DATE Purpose To send the calibration date to the instrument Format cal prot date year month day Parameter year 1999 to 2098 month
96. EC m ME O00 MN aes R254 S S b Oo OI OO oo 2 25 LD O29 OHO QUOD 7 KT oo k j C196 R236 R326 EN Li LI LJ HI Lj 208 i R324 OO SES cr O0 O Core H PES e 0005 Opp a UE NN OO ere C125 t R115 fo C128 C192 R231 e 2 SA CS lt MET Ema COTO OOOO eris C288 ero OOO R200 tee CO O E NA 25 5 C284 DOO Er R394 L eh SO Oo E 2820 6 R2 ul eS 0223 2 3 1 L a Des R390 R395 R396 Ao 2 C283 R391 8392 c234 O d O Q sl ae R382 R383 O 142 I 237 221 R400 o Q R183 11 C149 c e O EC Sa Hed Orso EE x o 2 ries 152 cer C204 C65 C195 R193 ac ien E eo H c2i8 1 ERT I cee2 99 R305 E 8 ou m Tr 206 O c67 LI R182 R319 lt 69 gt lt R229 R227 LL _ C57 238 R201 11 LOUL C150 Sere ba L 212 0 C ci53 LJ OOo C71 R150 R170 VERS 7 oO 55 6 9 Li co L3 9 E c285 C269 O ri 00 R19
97. EG LM317M IC J FET OP AMP TLE2081CD IC CMOS ANALOG SWITCH DG211DY IC IRED AND PHOTO DIODE ARRAY IC 8 STAGE SHIFT STORE MC14094BD IC PHOTO DARLINGTON TRANS PS2706 1 IC TRMS TO DC CONVERTER 637JR Keithley part no TF 243 50K TF 236 TF 243 5K R 418 1K R 418 10K R 418 1K R 418 75 R 418 10K R 418 10 418 5 418 0499 418 5 49 418 12 4 TF 286 50 100P 418 3 01 418 100 418 4 75 R 418 4 75K R 418 200 R 418 56 2 R 418 56 2 VR 25 VR 5 VR 8 SW 468 SA 4 SA 8 CS 553 CS 1026 LSI 286 LSI 285 1 846 1 967 IC 768 IC 1468 IC 772 IC 1467 IC 796 Model 2701 Service Manual Replaceable Parts 6 9 Table 6 1 Continued Model 2701 motherboard parts list 0112 LOW COST HIGH SPEED JFET IC 1526 U113 U126 IC 1050 58 791 U114 U167 IC DUAL J FET OP AMP OP 282GS 1 968 0115 IC QUAD COMPARATOR LM339D IC 774 U116 IC DARLINGTON ARRAY ULN2003L 1 969 U117 U145 IC VOLT COMPARATOR LM311M IC 776 0119 IC 15V VOLTAGE REGULATOR IC 1334 Ulz IC 10 100 ETHERNET TRANSCEIVER LSI 263 U120 U131 U169 U186 U30 IC VOLT COMPARATOR LM393D IC 775 U123 IC DUAL PICOAMP AD706JR IC 910 U124 IC VOLTAGE REGULATOR IC 1132 U125 IC 15V VOLTAGE REGULATOR IC 1241 U13 IC OCTAL BUFFER IC 1308 U132 U138 U139 U190 IC OPA177GS IC 960 U133 IC CMOS ANAL SWITCH DG444DY IC 866 U137 U166 IC HI SPEED BIFET OP AMP AD711JR IC 894 U14 U20 U
98. Flat 2B Willocrissa 14 Rest House Crescent Bangalore 560 001 91 80 509 1320 21 Fax 91 80 509 1322 ITALY Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 JAPAN New Pier Takeshiba North Tower 13F 11 1 Kaigan 1 Minato ku Tokyo 105 0022 81 3 5733 7555 Fax 81 3 5733 7556 KOREA 2FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 888 82 2 574 7778 Fax 82 2 574 7838 NETHERLANDS Postbus 559 4200 AN Gorinchem 0183 635333 Fax 0183 630821 SWEDEN c o Regus Business Centre Frosundaviks All 15 4tr 169 70 Solna 08 509 04 679 Fax 08 655 26 10 SWITZERLAND Kriesbachstrasse 4 8600 D bendorf 01 821 94 44 Fax 01 820 30 81 TAIWAN 1FL 85 Po Ai Street Hsinchu Taiwan R O C 886 3 572 9077 Fax 886 3 572 903 1 4 02 Model 2701 DMM Data Acquisition System Service Manual 92002 Keithley Instruments Inc rights reserved Cleveland Ohio U S A First Printing June 2002 Document Number 2701 902 01 Rev A Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual The Revision Level letter increases alphabetically as the manual undergoes subsequent updates Addenda which are released between Revisions contain important change information that the user should incorporate immediately into the manual Add
99. HLHLHL L H CH17 CH18 CH19 CH2 1 H L H HLHLHLH LH LH CH21 CH22 2 11 12 CH13 CH14 CH15 CH16 CH22 Fuse CH21 Fuse 5 De solder the blown CH21 or CH22 fuse as required taking care not to damage the cir cuit board or spread solder flux around the board 6 Install a new 3A 250V fast blow fuse Keithley part number FU 107 1 CAUTION Do not use a fuse with a higher current rating than specified or module damage may occur 7 Solder the new fuse in place using organic OA based flux solder again taking care not to damage the circuit board or spread solder flux around the board 3 6 Routine Maintenance Model 2701 Service Manual 8 Carefully clean the repaired area of the circuit board with a foam tipped swab or brush dipped in pure water then blow dry the board with dry nitrogen gas Allow the board to dry for several hours in a 50 low humidity environment before use 9 Re install the circuit board into the plastic housing then close the top cover Replacing non volatile RAM battery The Model 2701 has a rechargeable lithium ion battery for non volatile RAM Use the pro cedure below to replace the battery if required Refer to the disassembly procedures in Section 5 and the parts list and component layout drawings at the end of Section 6 for more information WARNING _ There is a danger of explosion if the battery is incorrectly replaced Replace only with the part designate
100. MBLY FROM BACKPLANE BOARD PLACE 5 PIN TRANSFORMER WIRES IN CABLE CLAMP 2101 092 CHASSIS TRANSFORMER ASSEMBLY DETAIL 2 BJ WIRING FRONT PANEL REF FRONT PANEL 2752542 CABLE TIE jas RECOMMENDED PROCESS AGAIN CHECKING WIRES ALIGN BOARD TO SLOTS WITH LANCES ON CHASSIS BEING CAREFUL NOT TO PINCH P C BOARD WIRES OR RIBBON CABLE SLIDE BOARD TOWARDS REAR PANEL 4 gt ll 2701 2701 054 Chassis Assembly l PART NUMBER DESCRIPTION MODEL NEXT ASSEMBLY NEXT PROCESS STEP QTY 2101 052 FP CARD CAGE ASSEMBLY JSED ON SHIELD UNLESS OTHERWISE SPECIFIED Tech Chassis Assembly 2001 5312 END JACK CURRENT INPUT KEITH LEY Keithley Instruments Inc FU 99 FUSE 3 6 32XIPPHSEM PHIL PAN HEAD SEMS SCREW CONFIDENTIAL PROPRIETARY 2 NM eS Oo RETE E SPE max GF ECA NO REVISION DATE S0 101c e 2 _ C MGE MGE 428 3030 REAR BEZEL NOTE ORIENTATION OF WORDING BEFORE INSTALLING COVER REMOVE PAPER FROM TOP OF BEEPER ON BOARD AND CHECK ALL WIRE CONNECTIONS THEN POWER UP UNIT TO LOOK AT FAN TO SEE IF OPERATIONAL a C ARTIVE FANEL SCREW b dE Dope IE SD 05 102 SCREWLOCK FEMALE 4 REQ D A IN LBS 4 A0X 1 4PFHUC 4 REQ D T IN LBS 4 40x5 16PPHSEM 2 REQ D 5 IN LBS T SW ROD 557 See RCCUMMENDED PROCESS Soy EG Foor MDE 4 40
101. MPLIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EXCLUDED DAM AGES SHALL INCLUDE BUT ARE NOT LIMITED TO COSTS OF REMOVAL AND INSTALLATION LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON OR DAMAGE TO PROPERTY KEITHLEY Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 www keithley com Sales Offices BELGIUM Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 CHINA Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 6202 2886 Fax 8610 6202 2892 FINLAND Tiet j ntie 2 02130 Espoo Phone 09 54 75 08 10 Fax 09 25 10 51 00 FRANCE 3 all e des Garays 91127 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 GERMANY Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire 4AB 0118 929 7500 Fax 0118 929 7519 INDIA
102. O9 1E6 900E3 to 1 1E6 Use exact calibrator resistance value for parameter 2 16 Calibration Model 2701 Service Manual DC current calibration After the 1 resistance point has been calibrated follow these steps DC current calibration 1 Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2701 as shown in Figure 2 3 2 Perform the calibration steps listed in Table 2 10 For each step 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 e Wait until the Model 2701 completes each step before continuing NOTE Ifyou are performing DC only calibration proceed to Programming calibration dates on page 2 18 Table 2 10 DC current calibration programming steps Calibration Calibrator step current Calibration command Parameter range 10 00000mA CAL PROT DC STEPIO 10 3 9E 3 to 1 1E 3 100 00000mA CAL PROT DC STEP11 100E 3 90E 3 to 110 3 1 000000 CAL PROT DC STEPI2 1 0 9 to 1 1 Change parameter if using different current Model 2701 Service Manual Calibration 2 17 AC voltage calibration Follow these steps for AC voltage calibration 1 Connect the calibrator to the Model 2701 INPUT HI and LO terminals as shown in Figure 2 4 2 Perform the calibration steps summarized in
103. PNP MMBT3906L TRANS NPN MMBT3904 TRANSISTOR RES 33 2 1 100MW THICK FILM RES 1M 5 125MW METAL FILM RES 24K 5 1W 200V THICK FILM RES 549K 1 1 4W METAL FILM RES 1 1 10W METAL FILM RES 1 1 4W METAL FILM RES 100 1 100MW THICK FILM THICK FILM RES 15K 1 100MW THICK FILM RES 604 1 100MW THICK FILM RES 2 49 1 1 4W METAL FILM RES NET VARIOUS 1 MDN460 Keithley part no CS 761 9 CS 848 9 CS 724 5 CS 339 RL 155 CH 61 CH 111 1 CH 57 CH 66 22 CH 62 CH 62 CH 93 1 EM 6 88 1 FE 36 2 TG 243 TG 276 TG 294 TG 347 166 294 259 244 238 429 R 418 33 2K R 375 1M R 437 24K R 315 549K R 263 11K R 391 1K R 418 100 TF 280 1 R 418 15K R 418 604 R 391 2 49K TF 255 6 6 Replaceable Parts Table 6 1 Continued Model 2701 motherboard parts list Circuit designation R119 R384 R385 R123 R126 R128 R185 R275 R129 R132 R139 R148 R163 R135 R137 R143 R152 R164 R138 R141 R414 R88 R140 R165 R184 R187 R190 R200 R204 R206 R142 R145 R156 R195 R199 R202 R208 R213 R257 R146 R147 R149 R386 R387 R150 R231 R325 R328 R346 R388 R151 R166 R153 R157 R158 R159 R182 R272 R167 R173 R197 R256 R284 R288 R298 R340 R169 R87 R170 R171 R172 R339 R343 R62 R174 R224 R389 R70 R178 R179 R280 180 181 R188 R189 R400 R401 R191 R193 R391 R395 R56 R71 R76 R192 R194 R196 R198 R201 R238 R205 R33
104. RNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY 1067 _ 100bT SEITE ER I MADE IN A DIGITAL TRIG LINK EXT TRIG Line Voltage Selector Window Fuse Holder Assembly Table 3 1 Power line fuse 100 120V 0 630A 250V 5 x 20 mm slow blow FU 106 630 200 240V 0 315A 250V 5 x 20 mm slow blow FU 106 315 3 4 Routine Maintenance Model 2701 Service Manual Replacing the front terminal AMPS fuse The front terminal AMPS fuse protects the Model 2701 current input from an over current condition Follow the steps below to replace the AMPS fuse WARNING sure the 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 From the front panel gently push in the AMPS jack with your thumb and rotate the fuse carrier one quarter turn counterclockwise See Figure 3 2 Release pressure on the jack and its internal spring will push the fuse carrier out of the socket 3 Remove the fuse and replace it with the same type 250 fast blow Keithley part number FU 99 1 CAUTION Do not use a fuse with a higher current rating than specified or instrument damage may occur If the instrument repeatedly blows fuses locate and correct the cause of the trouble before replacing the fuse 4 Install the new fuse by reversing the above pro
105. ROGRAMMED ROM IC LATCHED DRIVERS UCN 5812EPF 1 CRYSTAL 4MHZ C 418 1 C 451 33P C 418 1 C 417 22 C 451 47P RF 103 DD 61 CA 123 16A R 418 15K R 391 12 1 R 418 13K R 375 10M R 418 10K 2000 800A02 1 732 CR 36 4M CONN 2 ROWS OF 16 PINS CONN RT ANGLE HEADER CONN FEMALE 8 PIN CONN MALE 3 PIN FERRITE CHIP 600 OHM BLM32A07 RES 4 75K 1 100MW THICK FILM RES 475 1 1 4W METAL FILM CS 736 4 CS 1066 1 CS 612 8 CS 612 1 CH 62 R 418 4 75K R 391 475 6 12 Replaceable Parts Table 6 4 Model 2701 miscellaneous parts list Quantity 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 2 2 2 2 1 1 1 1 1 1 1 SLOT COVER HANDLE FAN SWITCHPAD CHASSIS REAR PANEL FRONT PANEL FRONT PANEL DISPLAY LENS SLOT COVER BEZEL REAR FOOT MOUNTING EAR RIGHT MOUNTING EAR LEFT POWER ROD BATTERY LITHIUM ION BANANA JACK PUSH IN BLACK BANANA JACK PUSH IN RED FOOT EXTRUDED FOOT RUBBER FUSE HOLDER FUSE 630A 250V SLO BLO FUSE FUSE 3A 250 LINE MODULE TRANSFORMER TEST LEADS LINE CORD Model 2701 Service Manual 2750 321A 428 329F 39 1 2000 310 2701 301 2701 2701 2001 302H 2701 311A 2750 321A 428 303D 428 319A 428 328E 428 338B 704 313A BA 52 BJ 14 0 BJ 14 2 FE 22A FE 6 FH 35 1 FU 106 630 FU 99 1 PM 1 1B TR 361A CA 22 CO 7 Model 2701 Service Manual Table 6 5 Model 7700 parts list Circuit designation
106. SHOWN IN WINDOW CA 180 3 CABLE W O SHIPPING KIT DW 950 903 VOLTAGE USE PA 854 PACKING LIST W O SHIPPING KIT DOMESTIC 120V LINE CORD W O SHIPPING KIT Lp PA 804 PACKING LIST W O SHIPPING KIT JAPAN se x FUSE CAi22 TEST LEADS W O SHIPPING EUROPE 220V cy gg 315 nee 247 ___4 __ 2 PHIL PAN HEAD SCREW ____2150 32 SLOT COVER P 428 329 EN HANDLE BN 2101 904 00 MANUAL PACKAGE W O SHIPPING KIT B 27559 DEL PA 805 ADD 2101 904 00 ___ TE PERFORM HIPOT TEST pon Mood WEL VOLTAGE SPEC 2701 Ad T MODEL NEXT ASSEMBLY NEXT PROCESS STEP OT USED ON 2700 851 SOFTWARE W O SHIPPING KIT 99 T SCALE H scare XX FU 106 315 _ FUSE 0 22570 LINE KEITHLEY Keithley Gnome FOR JAPAN coa LINECORD O Cleveland Ohio ENG Final Inspection c 2101 080 _ gt uel 6 Replaceable Parts 6 2 Replaceable Parts Model 2701 Service Manual Introduction This section contains replacement parts information and component layout drawings for the Model 2701 and Model 7700 Parts lists Both electrical and mechanical parts for the Model 2701 are lis
107. Section 3 1 4 Performance Verification Model 2701 Service Manual 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 calibrator uncertainty will add to the uncertainty of each measurement Table 1 1 Recommended verification equipment Fluke 5700A Calibrator AC voltage AC current DC voltage 1kHz 50kHz DC current 1kHZ Resistance 100mV 14ppm 100mV 200ppm 20mA 60ppm 1A 690ppm 100Q 17ppm 1 0V 7ppm 1 0V 82ppm 100mA 70ppm 2 2A 682ppm 1kQ 12ppm 10V 5ppm 10 82ppm 1A 110ppm 10kQ 11ppm 100V 7ppm 100V 90ppm 2 2A 94ppm 100kQ 13ppm 1000V 9ppm 700V 85ppm 18ppm 37ppm 100 0 120ppm Fluke 5725A Amplifier AC Voltage 50kHz 700V 375 DC Current 3A 500ppm AC Current 1kHz 3A 457ppm Stanford Research Systems DS345 Function Generator IV RMS 5ppm General Radio 1433 T Precision Decade Resistance Box 10Q to 400Q 0 02 Miscellaneous Equipment Double banana plug to double banana plug shielded cables 2 BNC to double banana plug shielded cable NOTE The Fluke 5725A amplifier is necessary only if you wish to verify the 750V AC range at 50kHz and AC and DC current ranges at Verification at 220V 50kHz and 2 2A on the current ranges using only the 5700A calibrator is adequa
108. Table 2 11 For each step Set the calibrator to the indicated voltage and frequency 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 2701 completes each step before continuing Table 2 11 AC voltage calibration programming steps Calibration step Calibrator voltage frequency Calibration command 10mV AC at 1kHz 10 00000mV 1kHz CAL PROT AC STEPI 100mV AC at 1kHz 100 0000mV 1kHZ CAL PROT AC STEP2 100mV at 50kHz 100 0000mV 50kHz CAL PROT AC STEP3 at 1kHz 1 000000 1kHz CAL PROT AC STEPA I VAC at 50kHz 1 000000V 50kHz 5 5 at 1 7 10 00000 1kHz CAL PROT AC STEPO at 50kHz 10 00000V 50kHz CAL PROT AC STEP7 100VAC at 1 7 100 0000V 1kHz CAL PROT AC STEPS 100VAC at 50kHz 100 0000V 50kHz CAL PROT AC STEPO 700VAC at IKHz 700 000 1kHz CAL PROT AC STEPIO 2 18 Calibration Model 2701 Service Manual AC current calibration Follow these steps for AC current calibration 1 Connect the calibrator to AMPS and INPUT LO terminals of the Model 2701 as shown in Figure 2 3 2 Perform the calibration steps summarized in Table 2 12 For each step Set the calibrator to the indicated current and frequency make sure the unit is in operate You must use the stated current and frequency Send the indicated programming command e Wait until the Model
109. a lost DC calibration data lost Calibration dates lost Card calibration data lost Card calibration dates lost Questionable calibration Model 7700 card only B 24 Calibration Reference Model 2701 Service Manual Error queue As with other Model 2701 errors any calibration error will be reported in the remote error queue You can read this queue by using the SYST ERR query The Model 2701 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 to obtain the status byte then test bit 2 to see if it is set If the 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 Detecting calibration step completion When sending remote calibration commands you must wait until the instrument completes the current operation before sending a command You can use the OPC operation complete query to help determine when each calibration step is completed With the OPC query the instrument will place an ASCII 1 in the output queue when it has completed each step To use this method allow a sufficiently long timeout period after sending each calibration command then test for an ASCII 1 in the output queue by sending
110. age and dBm is as follows 2 Rrer From the previous example on calculating DC characteristics accuracy it can be shown that a measurement of 0 998815V on the 1 range has an uncertainty of 36 9644mV or 0 998778 to 0 998852V using one year specifications Expressing 0 998778V as dBm 0 998778 V 500 dBm 210log imw 12 99968dBm and expressing 0 998852V as dBm 2 _ 0 998852V 500 _ 13 00032dBm B Sem ImW Thus the actual reading range is 13dBm 0 00032dBm dBm and dB for other voltage inputs can be calculated in exactly the same manner using pertinent specifications ranges and reference impedances 8 Specifications Model 2701 Service Manual Calculating dB characteristics accuracy The relationship between voltage and dB is as follows Vin dB 20 log V ep As an example of how to calculate the actual readings limits for dB with a user defined VREF of 10V you must calculate the voltage accuracy and apply it to the above equation To calculate 60dB measurement assume 10mV RMS for a VREF of 10V Using the 100mV range one year 10Hz 20kHz frequency band and SLOW rate the voltage limits are as follows Accuracy 0 06 of reading 0 03 of range 0 0006 x 10mV 0 0003 x 100mV 6uV 36u V Thus the actual reading accuracy is 1OmV 36mV or 10 036mV 9 964mV Applying the voltage reading accuracy into the dB equation yields 10 036m V dBm 20108 joy
111. al connections Turn on the function generator and multimeter allow a two hour warm up period before measuring Set the function generator to output a RMS sine wave at 3Hz Measure and record the signal amplitude Front panel manufacturing calibration l Figure 2 5 Install the shorted Model 7797 calibration board see Calibration card preparation earlier in this section in scanner card Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium Press and hold the OPEN key while turning on the power Press SHIFT then TEST then display CALIB TEST with the up or down range key Press ENTER select RUN then enter the appropriate calibration code default 002701 Select ALL at the CAL RUN prompt Press ENTER to perform the first manufacturing calibration step Perform the entire front panel comprehensive calibration procedure discussed earlier in this section See Comprehensive calibration earlier in this section Connect the function generator to the Model 2701 front panel INPUT jacks as shown in Figure 2 5 Select the front input Jacks with the INPUTS switch Function generator connections for manufacturing calibration BNC to Dual Banana Jack Model 2701 Adapter Function Generator KEITHLEY Integra Series Q 4WI 2 500 X Coax Cable Eunction Note Output voltage must be INPUT accurately
112. an do so by verifying that the Settled indicator is off or by using the OPC operation complete query Table 2 8 DC voltage calibration programming steps Calibration step Calibrator voltage Calibration command 10 00000V CAL PROT DC STEP3 10 9 to 11 10 00000V CAL PROT DC STEPA 10 910 11 100 0000V CAL PROT DC STEPS5 100 9010 110 Use recommended value where possible Change parameter accordingly if using a different calibrator voltage Resistance calibration Follow these steps for resistance calibration 1 Set the calibrator to the resistance mode and turn on external sensing NOTE Use external sense 4 wire 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 9 For each step Set the calibrator to the indicated resistance and make sure the unit is in operate Use the recommended resistance or the closest available value Send the indicated programming command Change the command parameter if you are using a different calibration resistance than that shown Wait until the Model 2701 completes each step before continuing Table 2 9 Resistance calibration programming steps Calibration Calibrator step resistance Calibration command Parameter range CAL PROT DC STEP6 1E3 900 to 1 1 CAL PROT DC STEP7 10E3 9 to 11E3 CAL PROT DC STEPS 100E3 90E3 to 110E3 CAL PROT DC STEP
113. ange 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 150 50uV 200uV Thus the actual reading range is 5 Vx 200 or from 4 9998V to 5 0002 V 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 specifications ranges and input signal values Model 2701 Service Manual Specifications A 1 Calculating dBm characteristics accuracy As an example of how to calculate the actual reading limits for a 13dBm measurement with a reference impedance of 500 assume an applied signal 0 998815 V The relationship between volt
114. ansformer Chassis Assembly 2701 051 Front Panel Card Cage Chassis Assembly 2701 052 Chassis Assembly 2701 053 2701 054 Final Inspection 2701 080 5 4 Disassembly Model 2701 Service Manual 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 secure the rear bezel to the chassis Pull the bezel away from the case Removing Bottom Screws Remove the four bottom screws that secure the case to the
115. at builds up on you or your clothing may be sufficient to destroy these devices if they are not handled properly Use the following precautions to avoid damaging them CAUTION CMOS devices are installed in the Model 2701 Handle all semiconductor 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 soldering irons Once the device is installed in the PC board it is normally adequately protected and you can handle the boards normally Assembly drawings Use the following assembly drawings to assist you as you disassemble and reassemble the Model 2701 Also refer to these drawings for information about the Keithley part numbers of most mechanical parts in the unit The drawings are located at the end of this section Front Panel Assembly 2701 040 Card Cage Power Module Assembly 2701 050 Power Module Tr
116. ate If the cali brator cannot output the exact resistance value use the Model 2701 left and right arrow keys and the range keys to adjust the Model 2701 display to agree with the actual calibrator resistance e Press the ENTER key to calibrate each point Wait for the Model 2701 to complete each step before continuing Table 2 4 Ohms calibration summary Calibration step Allowable range 0 9kQ to 1 1kQ to 90kQ to 110kQ 0 9MQ to 1 1MQ Nominal resistance Adjust Model 2701 calibration parameter to agree with actual value 2 10 Calibration Model 2701 Service Manual DC current calibration After the IMQ resistance point has been calibrated the unit will prompt you to apply 10mA Follow these steps for DC current calibration Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2701 as shown in Figure 2 3 Figure 2 3 Connections for DC and AC amps calibration INPUT LO DC and AC Current Calibrator Model 2701 E I OUTPUT HI MATH OUTPUT RATIO CHAVG CONUMOGOMCNECESIGDISENSORR ere ES i RANGE F DELAY HOLD LIMITS _ON OFF TYPE MONITOR CH OFF CARD LOCAL JL miej lt AMPS SETUP CONFIG TEST 15 ETHERNET RS 232 RANGE POWER SAVE AMPS OUTPUT Note Be
117. ath from each other 5 Source each of the voltages summarized in Table 1 14 and verify that the temperature readings are within limits Be sure to select the appropriate thermocouple type for each group of readings See step 3 above Open Channel 1 after the test is complete Table 1 14 Model 7700 thermocouple temperature verification reading limits Applied DC voltage Reading limits 1 year 18 to 28 7 659mV 191 0 to 189 0 C 1 0 to 1 0 C 42 280mV 749 0 to 751 0 C 5 730mV 191 0 to 189 0 C 0 to 1 0 C 54 138mV 1349 0 to 1351 0 C Voltages shown are based on ITS 90 standard 1 30 Performance Verification Model 2701 Service Manual RID temperature l Connect the precision decade resistance box listed in Table 1 1 to the Model 7700 CHI and CH11 H and L terminals using four wire connections See Figure 1 12 for similar connecting scheme Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position Select the temperature function by pressing the TEMP key Close Channel 1 by press ing the CLOSE key and keying in 101 Configure the Model 2701 temperature function for units and temperature sensor 0 0 00385 as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C Press
118. ation AC current calibration Programming calibration dates Saving calibration constants Locking out calibration NOTE As with front panel calibration you can choose to perform comprehensive DC only or AC only calibration Be sure to include a space character between each command and parameter Preparing the Model 2701 for calibration 1 Connect the Model 2701 to the Ethernet or connect the unit to a computer through the 5 232 port using a straight through 9 pin to 9 pin cable use a 9 25 pin adapter if necessary 2 Turn on the Model 2701 and allow it to warm up for at least two hours before performing calibration 3 Unlock the calibration function by sending this command CAL PROT CODE KI002701 The above command shows the default code KI002701 Substitute the correct code if changed 4 Send the following command to initiate calibration CAL PROT INIT 2 14 Calibration Model 2701 Service Manual Short and open calibration 1 Connect the Model 8610 low thermal short to the instrument 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 active Wait at least three minutes before proceeding to allow for thermal equilibrium NOTE Be 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
119. ation constants Example CAL PROT CARD1 SAVE Save card calibration constants STEPO CALibration PROTected CARD 1 5 Purpose To perform Model 7700 calibration Format cal prot cardl stepO temp Parameter temp Cold calibration temperature C Description STEPO performs temperature sensor calibration of the Model 7700 The card must be allowed to cool down to ambient temperature before calibra tion The cold temperature of the card must be measured and sent as the temp parameter during calibration NOTE Before calibrating the Model 7700 make sure that power has been removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibration procedure complete the procedure as quickly as possi ble to minimize card heating that could affect calibration accuracy Example CAL PROT CARD1 STEPO 23 Perform 7700 calibration 22 Calibration Reference Remote error reporting Error summary Table B 5 summarizes Model 2701 calibration errors Table B 5 Calibration error summary Error number and description 10 vdc zero error 100 vdc zero error 10 vdc full scale error 10 vdc full scale error 100 vdc full scale error 100 vdc full scale error 2 w zero error 2 w zero error 100k 2 w zero error 10M 2 w zero error 10M 2 w full scale error 2 w open error 4 w zero error 4 w
120. att ge O va utput h B 854 f _ OOOOOOOO0000 L COO PRA SNS l COO SR Output J LO COO OCD OO Sense LO CH11 Note Use shielded low thermal cables to minimize noise Enable or disable calibrator external sense as indicated in procedure 1 26 Performance Verification Model 2701 Service Manual 2 Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Set the calibrator for 4 wire resistance with external sense Select the Model 2701 4 wire resistance function by pressing the Q4 key Close Channel 1 by pressing the CLOSE key and keying in 101 5 Set the Model 2701 for the 1009 range and make sure the FILTER is on Enable OCOMP offset compensated ohms for the 100Q range test Press SHIFT then 6 Recalculate reading limits based on actual calibrator resistance values 7 Source the nominal full scale resistance values for the 100 10 ranges summarized in Table 1 13 and verify that the readings are within calculated limits Table 1 13 Limits for plug in module resistance verification Nominal Nominal reading limits O Range resistance 1 year 18 to 28 Recalculated limits to
121. cedure Figure 3 2 Front terminal AMPS fuse Model 2701 KEITHLEY SENSE Q 4WIRE M 2 INPUTS oe PEAK IT A SHIFT F DELAY HOLD UMTS ONOFF MONITOR OFF CARD imt NM Fee FRONT REAR br EX TRIG TRIG STORE RECALL FILTER REL 250V Qus POWER SETUP CONFIG TEST LSYNC ETHERNET RS 232 OM OPEN CLOSE STEP SCAN DIGITS RATE EXIT ENTER Rotate Counterclockwise Model 2701 Service Manual Routine Maintenance 3 5 Replacing Model 7700 plug in module amps fuses WARNING The information in this section is intended only for qualified service per sonnel Do not perform these procedures unless you are qualified to do so Make sure that all plug in module connections are de energized and dis connected before replacing module amps fuses 1 Turn off the power and disconnect the power line and external connections from the Model 7700 Open the Model 7700 top cover 3 Locate the amps fuses for CH21 and CH22 see Figure 3 3 Remove the circuit board from the bottom plastic housing by removing the two bottom screws Figure 3 3 Model 7700 amps fuses Model 7700 O INPUT SENSE CH1 CH2 CH3 CH4 CH5 CH6 H LH LH L H L H L H CH7 CH8 CH9 CH10 SENSE OHMS 4 WIRE IAAAAAAABAAAAAAAAAZAAA ON NN
122. chassis Remove Cover To remove the case grasp the front bezel of the instrument and care fully slide the chassis forward Slide the chassis out of the metal case Motherboard removal Perform the following steps to remove the motherboard This procedure assumes that the case cover is already removed l Remove the RS 232 and Digital I O fasteners The RS 232 and Digital I O connectors each have two nuts that secure the connectors to the rear panel Remove these nuts Remove the front rear inputs switch rod At the switch place the edge of a flat blade screwdriver in the notch on the pushrod Gently twist the screwdriver while pulling the rod from the shaft Disconnect the front input terminals You must disconnect these input terminal connections INPUT HI and LO SENSE HI and LO AMPS Model 2701 Service Manual Disassembly 5 5 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 the fuse housing Push the wire forward and down to snap the spring out of the fuse hous ing Carefully pull the spring and contact tip out of the housing 4 Unplug cables Unplug the display board ribbon cable from connector J1014 Unplug the transformer cables from connectors J1002 and J6 Unplug scanner slots ribbon cable from connect
123. 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 accuracy and functionality of the product If you are unsure about the applicability of a replacement component call a Keithley Instruments office for information To clean an instrument use a damp cloth or mild water based cleaner Clean the exterior of the instrument only Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument 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 accord ing to instructions If the board becomes contaminated and operation is affected the board should be returned to the factory for proper cleaning servicing Table of Contents 1 Performance Verification TURN 1 2 Verification test requirements 1 3 Environmental conditions 1 3 Warm up porod 1 3 i 1 3 Recommended test equipment 1 4 ea 1 5 Example reading limit calculation 1 5 Calculating resistance reading limits 1 5 Restoring factory defa
124. d Using Using CONTINUITY THRESHOLD Adjustable 1 to 1000 Q Type Range Ref Junction Ref Junction Ref Junction CJC CJC INPUT PROTECTION 1000V all Source Inputs 350V Sense Inputs 300V J 200 to 0 C 0 1 0 1 0 3 0 8 1 6 with plug in modules K 200 to 0 C 0 2 0 2 0 4 0 8 1 6 N 200 to 0 C 0 3 0 3 0 6 0 8 1 6 DC Current T 200 to 0 C 0 2 0 1 0 4 0 8 1 6 E 200 to 0 C 0 1 0 3 0 8 1 6 SHUNT RESISTORS 100mA 3A 0 10 20mA 50 R 0 to 400 C 0 4 0 6 12 0 5 10 INPUT PROTECTION 250V fuse S 0 to 400 C 0 4 0 6 1 2 0 5 1 0 B 350 to 1100 C 0 8 0 3 1 7 0 5 1 0 Thermocouples 20 For lead resistance gt 00 add the following uncertainty Q for measurement temperatures of CONVERSION ITS 90 709 100 C 1002 1509 REFERENCE JUNCTION Internal External or Simulated Fixed 2 2 44004 0 22 1 11 C OPEN CIRCUIT CHECK Selectable per channel Open gt 11 4k 200Q 5 0 44007 0 10 0 46 10kQ 44006 0 04 C 0 19 C 21 Front panel resolution is limited to 0 1Q AC SPECIFICATIONS Accuracy of reading of range 23 C 5 C Calibration 3 Hz 10 Hz 20 kHz 50 kHz 100 kHz Function Range Resolution Cycle 10 Hz 20 kHz 50 kHz 100 kHz 300 kHz Voltage 100 0000 mV 0 1 uV 90 Days 0 35 0 03 0 05 0 03 0 11 4 0 05 0 6 0 08 4 0 0 5 1 000000 V 1 0 pV all ranges 10 00000 V 10 pV 1 Year 0 35 0 03 0 06 0 03 0 12 0 05 0 6 0 08 4 0 0 5 100 0000 V 100 pV all ranges 750 000 V 1 0 mV Temp Coeff C 0 035
125. d by the corresponding Keithley part number Dispose of used batteries according to the manufacturer s instructions The following procedure is intended only for qualified service personnel Do not perform this procedure unless you are qualified to do so Disconnect the line cord and all connecting wires from the Model 2701 before removing the top cover WARNING _ The precautions below must be followed to avoid personal injury Wear safety glasses or goggles when working with lithium ion batteries not short the battery terminals together e Keep lithium ion batteries away from all liquids e Observe proper polarity when installing the battery Do not incinerate or otherwise expose the battery to excessive heat gt 60 C Bulk quantities of lithium ion batteries should be disposed of as haz ardous waste 1 Before replacing the battery refer to the troubleshooting procedures in Table 4 4 in Section 4 to determine if the battery requires replacement 2 Remove the Model 2701 top cover and motherboard using the disassembly procedures in Section 5 3 Remove the battery from its holder on the bottom of the case near the front panel Install a new battery Keithley part number BA 52 5 Re install the motherboard and top cover by following the disassembly procedures in Section 5 in reverse order Be sure to plug in all cables including the cable that connects the battery to the motherboard at J900 Model 2701 Se
126. d open 2 14 Remote error reporting B 22 Repair considerations 4 2 Replaceable Parts 6 1 resistance A 5 verifying Model 2700 1 14 verifying Model 7700 1 25 RS 232 interface 4 9 Scanner card signals 4 12 signal switching 4 10 Solder repairs 5 2 Specifications 1 Static sensitive devices 5 3 Status byte EAV Error Available bit B 24 Switching device locations 4 19 Temperature A 5 temperature RTD Model 2700 1 17 RTD Model 7700 1 30 thermocouple Model 2700 1 16 thermocouple Model 7700 1 28 verifying Model 2700 1 16 verifying Model 7700 1 28 Trigger circuits 4 9 Troubleshooting 4 1 verification Model 2700 1 8 Model 7700 1 18 Verification limits 1 5 Verification test considerations 1 7 Model 2700 1 6 Model 7700 1 6 summary 1 6 verification test procedures 1 6 Verification test requirements 1 3 verifying AC current Model 7700 1 24 O2 signal multiplexing and gain 4 18 O2 signal switching 4 15 22 04 reference switching 4 16 O4 signal multiplexing and gain 4 18 O4 signal switching 4 16 Warm up period calibration 2 2 Verification Procedures 1 3 Specifications are subject to change without notice All Keithley trademarks and trade names are the property of Keithley Instruments Inc All other trademarks and trade names are the property of their respective companies KEI I HLEY Keithley Instruments Inc Sales Offices BELGIUM CHINA FINLAND FRANCE GERMANY GREAT BRITAIN INDIA
127. de of the power module while pushing the module from the access hole Fan removal Perform the following steps to remove the fan l 2 3 Remove the motherboard Remove the four screws that secure the fan to the bottom of the chassis Remove the fan from the chassis Model 2701 Service Manual Disassembly 5 7 Instrument reassembly Reassemble the instrument by reversing the previous disassembly procedures Make sure that all parts are properly seated and secured and that all connections are properly made To ensure proper operation replace and securely fasten the shield WARNING ensure continued protection against electrical shock verify that power line ground green and yellow wire attached to the power module and the power transformer ground black wire are connected to the chassis When installing the power transformer be sure to reconnect the black ground wire to the mounting stud on side of the chassis Be sure to install the bot tom case screws to assure a good case to chassis ground connection Input terminal wire connections During reassembly use the information in Table 5 1 to connect input terminal wires Table 5 1 Input terminal wire colors INPUT HI INPUT LO SENSE HI SENSE LO AMPS Power module wire connections Use the information in Table 5 2 and DETAIL B of drawing 2701 050 to connect power module wires Table 5 2 Power module wire colors Location Wire color Right side Right top
128. ded for best results CAL PROT DC STEPA 10 Program 10V step Model 2701 Service Manual STEP5 Calibration Reference B 11 CALibration PROTected DC STEP5 Purpose Format Parameter Description Example SSTEP6 To program the 100V DC comprehensive calibration step cal prot dc step5 sCal voltage Cal voltage 90 to 110 V 5 5 programs the 100V DC comprehensive calibration step The allowable range of the calibration voltage parameter is from 90 to 110 but 100 is recommended for best results SCALSPROT DC STEP5 100 Program 100V step CALibration PROTected DC STEP6 Purpose Format Parameter Description Example program the 1kQ 4 wire comprehensive calibration step cal prot dc step o Cal resistance Cal resistance 900 to 1 1E3 0 STEP6 programs the 1kQ 4 wire resistance comprehensive calibration step The allowable range of the calibration resistance parameter is from 900 to 1 1E3 but 1E3 is recommended for best results ICALSPROTSDOTSIEPO ES Program 1kQ step CALibration PROTected DC STEP7 Purpose Format Parameter Description Example To program the 10kQ 4 wire comprehensive calibration step cal prot dc step 7 Cal resistance Cal resistance 9E3 to 11E3 Q STEP7 programs the 10kQ 4 wire resistance comprehensive calibration step The allowable range of the calibration resistance parameter is from OE3 to 1 1E3 but 10E3 is rec
129. dual modules refer to the appropriate appendices in the Model 2701 User s Manual Model 2701 Service Manual 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 Anambient temperature of 18 to 28 C 65 to 82 F Arelative humidity of less than 8096 unless otherwise noted Warm up period Allow the Model 2701 to warm up for at least two hours before conducting the verification procedures If the instrument has been subjected to temperature extremes those outside the ranges stated above allow additional time for the instrument s internal temperature to stabilize Typically allow one extra hour to stabilize a unit that is 10 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 2701 requires a line voltage of 100V 120V 220V 240V 10 and a line frequency of 45Hz to 66Hz or 360Hz to 440Hz Note that the line frequency is automatically sensed at power up but the line voltage must be manually set to either 100V 120V or 220V 240V as described in
130. e the CALIBRATING message will be displayed NOTE sure to minimize movement near front Input terminals Excessive movements cause capacitive coupling errors which could affect calibration accuracy 2 8 Calibration Model 2701 Service Manual DC voltage calibration After the front panel short and open procedure the unit will prompt you for the first DC voltage 10V Do the following 1 Connect the calibrator to the Model 2701 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 INPUT SENSE HI HI HI DC Voltage and Resistance Calibrator Model 2701 KEITHLEY INPUTS SHIFT CONFIG HALT TEST LSYNO ETHERNETRS282 RANGE SAVE SETUP CONFIG HALT TEST LSYNC ETHERNET RS 232 CLOSE STEP SCAN DIGITS RATE EXIT ENTER SENSE LO Note Use shielded low thermal cables to minimize noise Enable or disable calibrator external sense as indicated in procedure SENSE INPUT LO HI 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 e
131. e instrument when programming each step as summarized in the parameters listed above Example CAL PROT AC STEP7 Program 10V 50kHz step 16 Calibration Reference Model 2701 Service Manual Manufacturing calibration commands Three calibration steps are only performed at the factory or when the unit has been repaired CALibration PROTected AC STEP14 1V AC at 3Hz CALibration PROTected AC STEP15 AC at 1kHz CALibration PROTected DC STEPO Rear scanner terminal short circuit AC STEP 14115 CALibration PROTected AC STEP 14 15 gt Purpose To program individual AC manufacturing calibration steps Format cal protsac stepl4 Cal voltage cal prot ac stepl5 Cal frequency Parameter Cal voltage 1 nominal Cal frequency 1E3 1kHz nominal Description The AC STEP14 and AC STEP15 commands program the two manufacturing AC calibration steps The appropriate signal must be connected to the instrument when programming each step as summarized by the parameters listed above Example CAL PROT AC STEP14 1 Program AC step 14 CAL PROT ACT STEP LS ES Program AC step 15 DC STEPO CALibration PROTected DC STEPO Purpose To perform rear scanner terminal short circuit calibration Format cal prot doe stepO Parameter None Description STEPO performs the rear scanner terminal short circuit calibration step in the manufacturing calibration procedure Install an extender card with low th
132. e order shown for comprehensive DC only and AC only calibration procedures The procedures for front panel calibration include e Preparing the Model 2701 for calibration Front panel short and open calibration DC voltage calibration Resistance calibration DC current calibration e voltage calibration AC current calibration Setting calibration dates and saving calibration Preparing the Model 2701 for calibration 1 Turn the Model 2701 and allow it to warm up for at least two hours before perform ing a calibration procedure 2 Start the calibration process as follows a Access the calibration menu by pressing SHIFT then TEST then display TEST CALIB using the up or down range key Press ENTER b Use the up or down range key 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 002701 Use the left and right arrow keys to move among the digits use the up range key to incre ment numbers and press the down range key to specify alphabetic letters Confirm the code by pressing ENTER d Choose N at the prompt to proceed without changing the code then press ENTER 3 Choose which of the calibration tests summarized in Table 2 2 you want to run at the CAL RUN prompt Use the up and down range keys to scroll through the options select your choice by pressing ENTER Model 2701 Serv
133. ed on actual calibration resistance values and Model 2701 one year resistance accuracy specifications See Verification limits 1 16 Performance Verification Model 2701 Service Manual Verifying temperature Thermocouple thermistor and RTD temperature readings are derived from DC volts and resistance measurements respectively For that reason it is not necessary to independently verify the accuracy of temperature measurements As long as the DC volts and resistance functions meet or exceed specifications temperature function accuracy is automatically verified However temperature verification procedures are provided below for those who wish to separately verify temperature accuracy Thermocouple temperature 1 2 a b d e f 3 4 Table 1 7 Connect the DC voltage calibrator output terminals to the Model 2701 INPUT jacks using low thermal shielded connections Use 2 wire connections similar to those shown in Figure 1 1 Be sure the INPUTS switch is in the FRONT position Configure the Model 2701 for C units type J temperature sensor and 0 C simulated reference junction as follows Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C If necessary use the cursor and range keys to select units Press ENTER The unit displays the sensor type SENS TCOUPLE Make sure that TCOUPLE is displayed then press ENTER The unit then displays the thermocouple type TYPE K Select a type J
134. el 2701 one year 10kQ range accuracy of 100ppm of reading of range the calculated reading limits are Reading limits 10 03kQ 10 03kQ x 100ppm 10kQ x 6ppm Reading limits 10 02894kQ to 10 03106kQ Restoring factory defaults Before performing the verification procedures restore the instrument to its factory defaults as follows 1 Press SHIFT and then SETUP The instrument will display the following prompt RESTORE FACT 2 Using either range key select FACT then restore the factory default conditions by pressing ENTER 1 6 Performance Verification Model 2701 Service Manual Performing the verification test procedures Verification test summary Verification tests can be performed either through the Model 2701 front panel terminals or through plug in modules This section contains the following procedures Model 2701 verification Use this procedure to test Model 2701 accuracy through the front panel terminals Model 7700 verification Use this procedure to test accuracy through any of the available plug in modules with the same functions as the Model 7700 20 Channel Multiplexer Card Model 2701 tests Model 2701 verification test procedures include DC volts AC volts DC current AC current Resistance Temperature Frequency Model 7700 tests Model 7700 verification test procedures include DC volts AC volts DC current AC current Resistance Temperature Frequency Ratio and
135. en testing the 100mV and IV ranges to avoid errors caused by noise or thermal effects Connect the shield to the calibrator s output LO terminal Figure 1 8 Connections for Model 7700 DC volts verification Calibrator Output DC Voltage 2 HL B L H L Ht 7 V WIRE E JJ u Gua Gaia Y K gt asss sae er WIRE o Gata cuis uM m ns Cie Output IRD LO Note Use shielded low thermal cables Model 7700 for 100mV and 1V ranges 2 Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS switch is set to the REAR position 3 Select the DC volts function by pressing the DCV key and set the Model 2701 to the 100mV range Close Channel 1 by pressing the CLOSE key and then keying in 101 Set the calibrator output to 0 00000mV and allow the reading to settle 5 Enable the Model 2701 REL mode Leave REL enabled for the remainder of the DC
136. enda are numbered sequentially When a new Revision is created all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each new Revision includes a revised copy of this print history page Revision A Document Number 2701 902 01 June 2002 Keithley product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand names are trademarks or registered trademarks of their respective holders Mala Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation 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 and follow all installation operation and maintenance information carefully before us ing the product Refer to the manual for complete product specifications If the product is used in a manner not specified the protection provided by the product may be impaired The types of product users are Responsible body is the individual or group responsible for the use and maintenance of equipment for ensuring that the equip ment is operated
137. ent accuracy optimizing A 5 measurement speed optimizing A 5 Measuring function generator signal amplitude 2 20 Memory circuits 4 8 Microcontroller 4 6 Microprocessor 4 8 Model 7700 amps fuse 3 5 Model 7700 and 7706 calibration commands B 17 Module slot control 4 9 Motherboard removal 5 4 Multiplexer and A D converter 4 10 No comm link error 4 19 operation principles 4 5 Ordering information 6 2 Parts lists 6 2 Performance Verification 1 1 power components removing 5 6 Power module removal 5 6 Power module wire colors 5 7 Power supply 4 5 block diagram 4 5 Power supply checks 4 13 Power supply components 4 6 Power transformer removal 5 6 Power on self test 4 3 ratio and average verifying Model 7700 1 32 reading limit ACV Model 2700 1 11 calculating resistance 1 5 calculation example 1 5 DCV Model 2700 1 9 four wire RTD temperature verification Model 2700 1 17 Model 7700 thermocouple temperature verification 1 29 Plug in module ACV Model 7700 1 21 Plug in module DCV Model 7700 1 19 Plug in module four wire RTD temperature verification Model 7700 1 30 thermocouple temperature verification Model 2700 1 16 Recommended test equipment 1 4 2 22 Remote calibration 2 13 AC current 2 18 AC voltage 2 17 command summary B 2 DC current 2 16 DC volts 2 14 Locking out calibration 2 18 preparing the Model 2700 2 13 Programming calibration dates 2 18 resistance 2 15 saving calibration constants 2 18 short an
138. er ence junction as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C If necessary use the cursor and range keys to select units b Press ENTER The unit then displays the sensor type SENS TCOUPLE Make sure that TCOUPLE 15 displayed then press ENTER The unit displays the thermocouple type TYPE J d Selecta type K temperature sensor then press ENTER The unit then displays the reference junction type JUNC SIM e Select INT reference junction then press ENTER Model 2701 Service Manual Performance Verification 1 29 Figure 1 14 Connections for Model 7700 thermocouple temperature verification Twisted Wire Calibrator Output DC Voltage INPUT SENSE q H i os y L E L CH21 CH2Z 5 LO Sr I ar RC ar I ar SENSE LHL 9 CH20 R 7700 Low Thermal Copper Connection Make HI and LO Connections in Ice Bath Notes This setup and reading limits table does not include errors from ice point thermocouple wire and connections HI and LO connections from the calibrator and Model 7700 must be electrically isolated Ice B
139. ermal shorts on the output terminals installed in Slot 1 and select the rear scanner inputs before sending this command Example CCADGSPROTIDOSSTEPO Perform rear short circuit calibration Model 2701 Service Manual Calibration Reference B 17 Model 7700 calibration commands Table B 4 summarizes calibration commands for the Model 7700 plug in module Note that CARD commands calibrate the card in Slot 1 while CARD2 commands request calibration count and date information from a card in Slot 2 NOTE A Model 7700 must be installed in Slot I through a Model 7797 Calibration System card to be calibrated See Model 7700 calibration in Section 2 Table B 4 Model 7700 calibration commands Command CALibration PROTected CODE lt up to 8 char string CARDI INITiate COUNt RCOunt DATE LOCK LOCK STEPO lt NRf gt CARD2 COUNt DATE Calibration root command commands in this subsystem are protected by the calibration lock except queries and CODE Send calibration code Default 002701 Path to card in slot 1 Initiate card calibration Request number of times card had been calibrated Reset card calibration count to 0 Request card cal date Save cal constants to card EEPROM Lock out calibration Request cal lock state 0 2 locked 1 2 unlocked Temperature sensor cold calibration lt NRf gt temperature Path to card in slot 2 Request number of times card
140. etween front terminals INPUT HI and LO or more than 350V peak between SENSE HI and LO or instru ment damage could occur Follow these steps to verify resistance accuracy 1 Using shielded Teflon insulated or equivalent cables in a 4 wire configuration connect the Model 2701 INPUT and SENSE jacks to the calibrator as shown in Figure 1 5 Be sure the INPUTS switch is in the FRONT position Figure 1 5 Connections for Model 2701 resistance verification 1009 to ranges SENSE INPUT SENSE HI HI HI Resistance Calibrator Model 2701 KEITHLEY SENS 2 V Q4 INPU OUTPUT 350V 1000V H PEAK PEAK Imetel stem OUTPUT RATIO CHAG CONT senson sus RANGE p STOREJRECALD FILTER REL SAVE SETUP CONFIG TEST 15 OPEN CLOSE STEP SCAN DIGITS RATE LO is 5 Y OOO OOO OO CJ LJ RANGE CATI 7 OOO ooo OC EXIT ENTER SENSE INPUT LO HI SENSE LO Note Use shielded low thermal cables to minimize noise Enable or disable calibrator external sense as indicated in procedure Set the calibrator for 4 wire resistance with external sense on 3 Select the Model 2701 4 wire resistance function by pressing the Q4 key then choose the SLOW integration rate with the RATE key 4 Set the Model 2701 for the 1000 range and
141. hat set up the gain for the final ampli fier stage U166 Table 4 13 DCV signal multiplexing and gain Signal U129 U129 U129 Gain Range U163 pin 1 pin 8 pin 9 U166 S4 OFF OFF ON Table 4 14 ACV and ACA signal multiplexing and gain Signal U129 U129 U129 Gain Range U163 pin 1 pin 8 pin 9 U166 4 18 Troubleshooting Model 2701 Service Manual Table 4 15 DCA signal multiplexing and gain Signal U129 U129 U129 Gain Range U163 pin 1 pin 8 pin 9 U166 Table 4 16 02 signal multiplexing and gain Table 4 17 24 signal multiplexing and gain SA then 57 SA then 57 S4 then 57 S4 then 57 S4 then 57 S4 then 57 S4 then 57 Model 2701 Service Manual Troubleshooting 4 19 Figure 4 3 provides a block diagram of the analog circuitry Table 4 18 shows where the various switching devices are located in the block diagram Table 4 18 Switching device locations Switching devices Analog circuit section see Figure 4 3 0101 Q102 SSP Solid State Protection Q114 Q136 Q109 DCV Divider 101 Q113 105 0104 0108 and Ohms Switching 0121 Sense LO K102 U103 U105 U111 AC switching and Gain U133 Q119 Q123 Q124 Q125 Q126 Ohms I Source K103 Current Shunts U129 163 A D Mux and Gain 5 Disassembly 5 2 Disassembly Model 2701 Service Manual Introduction This section explains how to handle clean and disassemble the Model 2701 Ethernet Multimeter Data Acquisition System Disassemb
142. he CLOSE key and keying in 101 Select the Model 2701 RATIO function press SHIFT then RATIO Set the calibrator output to 1 00000V DC and allow the reading to settle Verify that the ratio reading is between 0 9999926 and 1 000074 Press OPEN to open Channel 1 Figure 1 16 Connections for Model 7700 ratio and average verification CH1 DC Voltage Calibrator IL INPUT SEN 5 6 Te 7 CH8 CH9 CH10 00005 AAAA ens Output HI 222 2 2 Wv 2WiRD gt I x E aN I gc 0 me e SENSE OHMS 4 WIRE Z HiHig l Ln LH L CH18 CH19 CH20 CH21 CH22 HW CHI2 CH13 CH14 CH15 CH16 Output LO Note Use shielded cables CH11 Model 7700 to minimize noise Calibration 2 2 Calibration Model 2701 Service Manual Introduction Use the procedures in this section to calibrate the Model 2701 Calibration procedures include Comprehensive calibration Usually the onl
143. he 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 15 released the message 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 fluorescent display is working properly Perform the following steps to run the display test 1 Press SHIFT and then TEST to access the self test options Use the up or down RANGE key to display TEST DISP 3 Press ENTER to start the test There are four parts to the display test Each time ENTER is pressed the next part of the test sequence 15 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 12 digits and annunciators are sequentially displayed d The annunciators located at either end of the display are sequentially displayed 4 When finished abort the display test by pressing EXIT The instrument returns to normal operation Model 2701 Service Manual Troubleshooting 4 5 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
144. hroughput The higher the interval the less scanning throughput is reduced but more relay counts may be lost in the event of a power failure To set the count update interval send this command ROUTe CLOSe COUNt INTerval interval For example to set the interval to 30 minutes send this command ROUT CLOS COUN INT 30 4 Troubleshooting 4 2 Troubleshooting Introduction Model 2701 Service Manual This section of the manual will assist you in troubleshooting and repairing the Model 2701 Included are self tests test procedures troubleshooting tables and circuit descriptions It is left to the discretion of the repair technician to select the appropriate tests and documentation needed to troubleshoot the instrument Refer to the disassembly procedures in Section 5 and the parts lists in Section 6 for further information WARNING The information in this section is intended only for qualified service per sonnel Do not perform these procedures unless you are qualified to do so Some of these procedures may expose you to hazardous voltages that could cause personal injury or death Use caution when working with hazardous voltages Repair considerations Before making any repairs to the Model 2701 be sure to read the following considerations CAUTION The PC boards are built using surface mount techniques and require specialized equipment and skills for repair If you are not equipped and or qualified it is strongl
145. ice Manual Introduction Use the procedures in this section to verify that Model 2701 Ethernet Multimeter Data Acquisition System accuracy is within the limits stated in the instrument s one year accuracy specifications You can perform these verification procedures Upon receiving the instrument make sure it was not damaged during shipment and the unit meets factory specifications If the instrument s accuracy is questionable e Following calibration WARNING 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 If the unit is not under warranty and it fails to meet specified limits refer to the calibration procedures in Section 2 There are two general verification procedures in this section e Model 2701 verification Covers procedures to verify measurement accuracy of the Model 2701 using the front panel terminals e Model 7700 verification Discusses procedures to verify accuracy of measurement made through the Model 7700 20 Channel Multiplexer Note that the same general procedures can be used to verify measurement accuracy of other Model 2701 plug in modules that have similar functions For specific information about the indivi
146. ice Manual Calibration 2 7 Table 2 2 Comprehensive calibration procedures Procedure Menu choice Procedures Full calibration comprehensive calibration steps DC and AC DCV DCI and ohms DC voltage DC current and resistance calibration ACV and ACI AC voltage and AC current calibration Front panel short and open calibration At the Model 2701 prompt for a front panel short perform 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 Model 2701 5 HI KEITHLEY Model 8610 Low thermal short SHIFT DELAY HOLD LIMITS ON OFF FRONT REAR SAVE SETUP CONFIG LSYNC ETHERNET RS 232 NOTE sure to connect the low thermal short properly to the HI LO and SENSE termi nals Keep drafts away from low thermal connections to avoid thermal drift which could affect calibration accuracy 2 Press ENTER to start short circuit calibration While the unit is calibrating it will display CALIBRATING 3 When the unit 15 finished with short circuit calibration it will display the following prompt OPEN CIRCUIT 4 Remove the calibration short and press ENTER During this phas
147. ine TISO uu Z 3 3 Closure count commands 3 7 4 Table 4 1 Table 4 2 Table 4 3 Table 4 4 Table 4 5 Table 4 6 Table 4 8 Table 4 7 Table 4 10 Table 4 11 Table 4 9 Table 4 13 Table 4 14 Table 4 12 Table 4 16 Table 4 17 Table 4 15 Table 4 18 5 Table 5 1 Table 5 2 6 Table 6 1 Table 6 2 Table 6 3 Table 6 4 Table 6 5 B Table B 1 Table B 2 Table B 3 Table B 4 Table B 5 Troubleshooting Flash memory failure modes 4 3 Power supply components 2 22 2 2 4 6 Display board CHECKS 4 13 Powersupplycheckt uuu u 4 13 Digital circuitry checks 4 14 signal switching 4 14 Q2 signal switching 4 15 and FREQ signal switching 4 15 22 04 reference switching 4 16 DCA signal switching 4 16 Q4 signal switching 4 16 signal multiplexing and gain 4 17 and ACA signal mu
148. ion count Model 2701 Service Manual Calibration Reference B 19 DATE CALibration PROTected CARD 1 DATE CALibration PROTected CARD2 DATE Purpose To request the Model 7700 calibration date Format cal prot cardl date cal prot card2 date Response year month day Description The CARD1 DATE and CARD2 DATE queries allow you to read back the calibration date from a Model 7700 in Slot 1 and Slot 2 respectively NOTE The card calibration date is automatically set to the Model 2701 real time clock date when the card is calibrated Example CAL CARDI DATE Request card 1 cal date CALibration PROTected CARD 1 INITiate Purpose To initiate Model 7700 calibration procedures Format ecalsprotscardliinit Parameter None Description The INIT command enables Model 7700 calibration when performing these procedures over the bus This command must be sent to the unit after sending the CODE command but before performing Model 7700 calibration Example CAL PROT CARD1 INIT Initiate 7700 calibration B 20 Calibration Reference Model 2701 Service Manual LOCK CALibration PROTected CARD 1 Purpose To lock out Model 7700 calibration Format cal prot cardl lock Parameter None Description The LOCK command allows you to lock out Model 7700 calibration after completing the procedure Thus LOCK performs the opposite of enabling calibration with the CODE command E
149. jacks as shown in Figure 2 5 Select the front input Jacks with the INPUTS switch Set the generator to output a 1V RMS 3Hz sine wave then send the following command CAL PROT AC STEPIA Cal voltage Here Cal voltage is the actual 3Hz generator signal amplitude you measured previously Set the generator to output a RMS sine wave then send the following command CAL PROT AC STEPI5 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 2 23 Calibration Model 2701 Service Manual Model 7700 calibration The following procedures calibrate the temperature sensors on the Model 7700 plug in modules NOTE For additional information about the Keithley modules refer to the appropriate appendix in the Model 2701 User s Manual Recommended test equipment In order to calibrate the Model 7700 you will need equipment summarized in Table 2 14 Table 2 14 Recommended equipment for Model 7700 calibration Digital Thermometer 18 to 28 0 1 C Keithley Model 7797 Calibration System Calibration card connections The Model 7700 being calibrated should be connected to the Model 7797 Calibration System card and the card should then be installed in scanner Slot 1 See the Model 7797 documentation Note that the module being calibrated
150. le DCI limits 1 23 Plug in module ACI limits 1 24 Limits for plug in module resistance verification 1 26 Model 7700 thermocouple temperature verification Hi Til ere uuu uu 1 29 Plug in module four wire RTD temperature verification reading THIS 1 30 Calibration Recommended equipment for comprehensive calibration 2 5 Comprehensive calibration procedures 2 7 DC volts calibration summary 2 9 Ohms calibration summary 2 9 DC current calibration summary 2 10 AC voltage calibration summary 2 11 AC current calibration summary 2 12 DC voltage calibration programming steps 2 15 Resistance calibration programming steps 2 15 DC current calibration programming steps 2 16 AC voltage calibration programming steps 2 17 AC current calibration programming steps 2 18 Recommended equipment for manufacturing calibration 2 19 Recommended equipment for Model 7700 calibration 2 22 Routine Maintenance Power l
151. libration l Connect the Model 7700 to the Model 7797 Calibration System card see Calibration card connections on page 2 22 With the power off install the Model 7700 7797 combination in Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium Accurately measure and record the cold temperature of the Model 7700 card surface at the center of the card Press and hold the Model 2701 OPEN key while turning on the power Enable calibration by sending the CODE command For example the default command is CAL PROT CODE 1002701 Initiate calibration by sending the following command CAL PROT CARDI INIT Calibrate the Model 7700 with the following command CAL PROT CARDI STEPO temp Here temp is the cold calibration temperature measured in Step 3 Send the following commands to save calibration and lock out calibration CAL PROT CARDI SAVE CAL PROT CARDI LOCK 3 Routine Maintenance 3 2 Routine Maintenance Model 2701 Service Manual Introduction The information in this section deals with routine type maintenance and includes procedures for setting the line voltage replacing the Model 2701 line and front terminal AMPS fuses and replacing the amps fuses for the Model 7700 plug in module Replacement of the Model 2701 non volatile RAM battery and module relay closure count is also covered Setting the line voltage and replacing the line fuse WARNING Disco
152. ltiplexing and gain 4 17 ACA signal switching 4 17 22 signal multiplexing and gain 4 18 O4 signal multiplexing and gain 4 18 DCA signal multiplexing and gain 4 18 Switching device locations 4 19 Disassembly Input terminal wire colors 5 7 Power module wire colors 5 7 Replaceable Parts Model 2701 motherboard parts list 6 3 Model 2701 display board parts list 6 11 Model 2701 backplane board parts list 6 11 Model 2701 miscellaneous parts list 6 12 Model Us 6 13 Calibration Reference Remote calibration command summary B 2 DC calibration commands B 9 AC calibration commands B 14 Model 7700 calibration commands B 17 Calibration error summary 22 Performance Verification 1 2 Performance Verification Model 2701 Serv
153. ly drawings are located at the end of this section Handling and cleaning To avoid contaminating PC board traces with body oil or other foreign matter avoid touching the PC board traces while you are repairing the instrument Some circuit board areas especially those under the motherboard shield have high impedance devices or sensitive circuitry where contamination could cause degraded performance Handling PC boards Observe the following precautions when handling PC boards e Wear cotton gloves Only handle PC boards by the edges and shields Do not touch any board traces or components not associated with repair e Do not touch areas adjacent to electrical contacts e Use dry nitrogen gas to clean dust off PC boards Solder repairs Observe the following precautions when soldering a circuit board e 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 e After cleaning allow the board to dry in a 50 low humidity environment for several hours Model 2701 Service Manual Disassembly 5 3 Static sensitive devices CMOS devices operate at very high impedance levels Therefore any static th
154. mplifier Connect to calibrator Note Amplifier required only for 700V 50 2 output INPUT HI Model 2701 1 KEITHLEY OUTPUT HI AEN Calibrator Hao AC cable allorator utpu Ollage INPUTL DINH DS OUTPUT LO Model 2701 Service Manual Performance Verification 1 11 Select the AC volts function by pressing the ACV key 3 Set the Model 2701 for the 100mV range make sure that REL 15 disabled 4 Source and 50kHz AC voltages for each of the ranges summarized in Table 1 3 and make sure that the respective Model 2701 readings fall within stated limits Table 1 3 ACV reading limits ACV Applied AC 1kHz reading limits 50kHz reading limits range voltage 1 year 18 C to 28 C 1 year 18 C to 28 C 100 0000m V 99 910 to 100 090mV 99 830 to 100 170mV 1 000000V 0 99910 to 1 00090V 0 99830 to 1 00170V 10 00000V 9 9910 to 10 0090V 9 98300 to 10 0170V 100 0000V 99 910 to 100 090V 99 830 to 100 170V 700 000 V 699 36 to 700 64V 698 79 to 701 21V Tf the 5725A amplifier is not available change 700V 50kHz step to 220V 50kHz Reading limits for 220V 50kHz 219 36 to 220 64 V 1 12 Performance Verification Model 2701 Service Manual Verifying DC current Check DC current accuracy by applying accurate DC currents from the DC current calibra tor to the AMPS input of the Model 2701 and verifying that the displayed readings fall within specified limits Follow these steps
155. n 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 Ethernet port or the RS 232 port send this com mand to unlock calibration CAL PROT CODE lt 8 character string The default code command 15 CAL PROT CODE K1002701 To change the code via remote simply send the CAL PROT CODE command twice first with the present code and then with the new code Model 2701 Service Manual Calibration 2 5 Comprehensive calibration The comprehensive calibration procedure calibrates the DCV DCI ACV ACI and ohms functions You can also choose to calibrate only the DCV DCI and resistance ACV ACI functions These procedures are usually the only calibration required in the field Manufacturing cali bration is normally done only at the factory but it should also be done in the field if the unit has been repaired See Manufacturing calibration at the end of this section for more information Calibration cycle Perform comprehensive calibration at least once a year or every 90 days to ensure the unit meets the corresponding specifications Recommended equipment Table 2 1 lists the recommended equipment you need for comprehensive DC only and AC only calibration procedures You can use alternate equipment
156. n 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 2701 input verifying that the displayed readings fall within specified limits Follow these steps to verify AC current 1 Connect the Model 2701 AMPS and INPUT LO jacks to the calibrator as shown in Figure 1 4 Be sure the INPUTS switch is in the FRONT position Figure 1 4 Connections for Model 2701 AC current verification INPUT LO Calibrator Output AC Current Model 2701 f KEITHLEY Integra Series OUTPUT 5 OUTPUT LO 2 Select the AC current function by pressing the ACI key 3 Setthe Model 2701 for the 1A range 4 Source 1 and full scale AC currents as summarized in Table 1 5 and verify that the readings are within stated limits Table 1 5 ACI limits ACV range Applied AC voltage Reading limits 1kHz 1 year 18 to 28 1 000000 0 99860 to 1 00140A 3A 3 00000A 2 9817 to 3 0183A f the Fluke 5725A amplifier is not available apply 2 2A from the calibrator Reading limits for 2 2A are 2 1949 to 2 2051A 1 14 Performance Verification Model 2701 Service Manual Verifying resistance Check resistance by connecting accurate resistance values to the Model 2701 and verifying that its resistance readings are within the specified limits CAUTION Do not apply more than 1000V peak b
157. n current parameter is from 9E 3 to 1 1E 3 Use the 1OE 3 value whenever possible for best results CAL SPROTSDO STEPIO 10 3 Program 10 step Model 2701 Service Manual SSTEP11 Calibration Reference B 13 CALibration PROTected DC STEP11 Purpose Format Parameter Description Example STEP12 To program the 100mA comprehensive calibration step tcal prot dc stepll Cal current Cal current 90E 3 to 1 10E 3 A STEP11 programs the 100mA comprehensive calibration step The allow able range of the calibration current parameter is from 90E 3 to 1 10E 3 Use the 100E 3 value whenever possible for best results SOCAL EROT DOC STEBI 100E 3 Program 100mA step CALibration PROTected DC 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 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 2 Program 1 step 14 Calibration Reference Model 2701 Service Manual AC calibration commands The AC commands perform comprehensive user calibration of the ACV and ACI func tions Table B 3 summarizes these calibration commands Table B 3 AC calibration commands CALibration PROTected AC STEPI
158. nnect the line cord at the rear panel and remove all test leads con nected to the instrument front and rear before replacing the line fuse The power line fuse is located the power module next to the AC power receptacle see Figure 3 1 If the line voltage must be changed or if the line fuse requires replacement per form the following steps 1 Place the tip of a flat blade screwdriver into the power module by the fuse holder assembly see Figure 3 1 Gently push in and to the left Release pressure on the assembly and its internal spring will push it out of the power module 2 Remove the fuse and replace it with the type listed in Table 3 1 CAUTION For continued protection against fire or instrument damage replace the fuse only with the type and rating listed If the instrument repeatedly blows fuses locate and correct the cause of the trouble before replacing the fuse 3 configuring the instrument for a different line voltage remove the line voltage selec tor from the assembly and rotate it to the proper position When the selector is installed into the fuse holder assembly the correct line voltage appears inverted in the window CAUTION Operating the Model 2701 on the wrong line voltage may result in instrument damage 4 Install the fuse holder assembly into the power module by pushing it in until it locks in place Model 2701 Service Manual Routine Maintenance 3 3 Figure 3 1 Power module Model 2701 WA
159. ns are for connection to Category I sourc es unless otherwise marked or described in the Manual 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 ANST states that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Operators of this product must be protected from electric shock at all times The responsible body must ensure that operators are prevented access and or insulated from every connection point In some cases connections must be exposed to potential human contact Product operators 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 Do not connect switching cards directly to unlimited power circuits They are intended to be used with impedance limited sourc es NEVER connect switching cards directly to AC mains When connecting sources to switching cards install protective de vices 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 con necting cables test leads and jumpers for possible wear
160. nsiderations 2 3 2 4 Front panel calibration code 2 4 Remote calibration code 2 4 Comprehensive calibration 2 5 Calibration uuu ua 2 5 Recommended equipment 2 5 Aborting calibration 2 6 Front panel calibration 2 6 Remote calibration 9 2 13 Manufacturing calibration 2 19 Recommended test equipment 2 19 Calibration card preparation 2 19 Unlocking manufacturing calibration 2 19 Measuring function generator signal amplitude 2 20 Front panel manufacturing calibration 2 20 Remote manufacturing calibration 2 2 Model 7700 calibration 2 22 Recommended test equipment 2 22 Calibration card connections 22 2 22 Model 7700 calibration 2 22 Routine Maintenance TREO Te
161. oblems can be checked using Table 4 5 Table 4 5 Digital circuitry checks Power on test RAM OK ROM OK Verify that RAM and ROM are functional J1 pin 3 Digital common signals referenced to digital common J1 pin 9 3 3V 3 3VD supply MPU supply voltage U4 pin 9 4 2 Battery backed memory charge voltage 900 pin 1 4 2V Battery voltage BA 52 U1 pin 149 Low on power up then goes high MPU RESET line U1 lines A0 A24 Check for stuck bits MPU address bus U1 lines D0 D31 Check for stuck bits MPU data bus 01 pin 174 50MHz MPU clock U15 pin 13 Pulse train during RS 232 I O RS 232 RX line 015 pin 14 Pulse train during RS 232 I O RS 232 TX line TPS 500Hz signal Signal present if main code is running properly 1 2 3 4 5 6 7 8 Analog signal switching states Table 4 6 through Table 4 12 provide switching states of the various relays FETs and ana log switches for the basic measurement functions and ranges These tables can be used to assist in tracing an analog signal from the input to the A D multiplexer Table 4 6 DCV signal switching Q14 wag 0102 0114 0136 0109 101 Q113 0105 0104 0108 ON ON OFF OFF 5 OFF ON OFF OFF K101 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Model 2701 Service Manual Troubleshooting 4 15 Table 4 7 and FREQ signal switching U103 U103 0105 U105 0103 U103 0105 111 Range 0
162. ock hazard When using the front panel terminals simultaneously with plug in modules all cable insulation voltage ratings must equal or exceed the maximum voltage applied to either the front panel terminals or the plug in module terminals 1 8 Performance Verification Model 2701 Service Manual Model 2701 verification Perform these tests to verify accuracy using the Model 2701 front panel terminals Verifying DC voltage Check DC voltage accuracy by applying accurate voltages from the DC voltage calibrator to the Model 2701 INPUT jacks and verifying that the displayed readings fall within specified limits CAUTION Do not exceed 1000V peak between front terminals INPUT HI and INPUT LO because instrument damage may occur Follow these steps to verify DC voltage accuracy 1 Connect the Model 2701 HI and LO INPUT Jacks to the DC voltage calibrator as shown in Figure 1 1 Make sure the INPUTS switch is set to the FRONT position NOTE Use shielded low thermal connections when testing the 100 and IV 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 Model 2701 DC volts verification INPUT HI Calibrator Output DC Voltage Model 2701 r ran OUTPUT Note Use shielded low thermal cables INPUT LO OUTPUT for 100mV and 1V ranges LO Model 2701 Service Manual Performance Verification 1 9 2 Select
163. ommended for best results CAL PROT DC SITER 2253 Program 10kQ step 12 Calibration Reference STEPG Model 2701 Service Manual CALibration PROTected DC STEP8 Purpose Format Parameter Description Example SSTEP9 To program the 100kQ 4 wire comprehensive calibration step cal prot dc step8 Cal resistance Cal resistance 90E3 to 110E3 0 STEP8 programs the 100kQ 4 wire resistance comprehensive calibration step The allowable range of the calibration resistance parameter is from to 110E3 but 100E3 15 recommended for best results CAL PROT DC STEP8 100E3 Program 100kQ step CALibration PROTected DC STEP9 Purpose Format Parameter Description Example STEP10 To program comprehensive calibration step cal prot dc step9 Cal resistance Cal resistance 900E3 to 1 1E6 STEP9 programs 1 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 CAL PROT 5 9 LEG Program 1MX calibration step CALibration PROTected DC STEP1 0 Purpose Format Parameter Description Example To program the 10mA comprehensive calibration step cal prot dc stepl0 Cal current Cal current 9E 3 to 11 3 A STEP10 programs the 10mA comprehensive calibration step The allow able range of the calibratio
164. or J1012 Unplug analog backplane connections J1008 and J1010 Unplug the battery cable from J1017 Unplug the fan cable from J1018 5 Remove the fastening screws that secure the motherboard to the chassis One of these screws is located along the left side of the unit towards the middle and it also secures U144 One screw is located at the right center of the chassis near the front rear switch 5101 and another screw is behind the AC shield The final screw is near the rear panel next to J5 During re assembly replace the board and start the RS 232 and Digital I O connector nuts and the mounting screw Tighten all the fasteners once they are all in place and the board is correctly aligned 6 Remove the motherboard which is held in place by edge guides on one side by sliding it forward until the board edges clear the guides Carefully pull the motherboard from the chassis Card cage removal After the motherboard has been removed the card cage that holds plug in modules can be removed simply by removing the screws that attach the card cage to the case bottom and removing it 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 Unplug the display board ribbon cable from connector J1014 2 Remove the front panel a
165. play board using Table 4 3 Table 4 3 Display board checks Front panel DISP test Verify that all segments operate Use front panel display test P1005 pin 5 5V 5 Digital 5 supply P1005 pin 9 37V 5 Display 37V supply 0401 pin 1 Goes low briefly on power up then Microcontroller RESET goes high 0401 pin 43 4MHz square wave Controller 4MHz clock 0401 pin 32 Pulse train every 1msec Control from main processor 0401 pin 33 Brief pulse train when front panel Key down data sent to main processor key is pressed Power supply checks Power supply problems can be checked using Table 4 4 Table 4 4 Power supply checks Line fuse Check continuity Remove to check Line voltage 120V 240V as required Check power module position Line power Plugged into live receptacle power on Check for correct power up sequence 5VD pad 5V 5 5VD referenced to Common D 3 3VD pad 3 3V 5 3 3VD referenced to Common D 2 5 pad 2 5V 5 2 5VD referenced to Common D 1 8VD pad 1 8V 5 1 8VD referenced to Common D 0101 pin 7 37V 5 37V referenced to Common 0125 pin 3 15V 5 15 referenced to Common 0119 pin 3 15V 5 15V referenced to Common A U124 pin 3 5V 5 5VRL referenced to Common A 1 2 3 4 5 6 7 8 9 0 1 l 0144 pin 2 2 C293 negative terminal 4 14 Troubleshooting Model 2701 Service Manual Digital circuitry checks Digital circuit pr
166. re occurs an error message will be displayed and the unit will automati cally enter the firmware upgrade mode as indicated by FW UPGRADE message Depend ing on the failure mode firmware upgrades can be performed through the port s listed in the table You can also force the unit into the firmware upgrade mode by holding in the STEP key during power up Table 4 1 Flash memory failure modes Flash memory code sections Status and error messages Firmware upgrade port LOADING FPGA RS 232 FPGA CHKSUM FPGA TIMEOUT FPGA COMMERR Ethernet LOAD ETHRNET RS 232 ETHER CHKSUM ETHR TIMEOUT Main code LOADING MAIN RS 232 or Ethernet MAIN CHKSUM Code sections tested in sequence shown 2 Error message displayed only on failure of specific test 3 Firmware upgrade can be performed only through indicated port s depending on failure mode 4 4 Troubleshooting Model 2701 Service Manual 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 on page 4 13 for details on troubleshooting the display board KEY test The KEY test allows you to check the functionality of each front panel key Perform the fol lowing steps to run the KEY test 1 Press SHIFT and then TEST to access the self test options Use the up or down RANGE key to display TEST KEY 3 Press ENTER to start t
167. rvice Manual Routine Maintenance 3 7 Plug in module relay closure count The Model 2701 keeps an internal count of the number of times each module relay has been closed This count will help you determine if and when any relays require replacement see module contact life specifications The count can be read or reset only via remote as outlined below Closure count commands Table 3 2 summarizes closure count commands Table 3 2 Closure count commands ROUTe Route subsystem CLOSe Path to CLOSe commands COUNT clist Query count for channels in clist channel list INTTerval lt Set count update interval in minutes 1 to 1440 INTerval Query count update interval RCOunt clist Reset count for channels in clist Unit must be in manufacturing calibration mode See text below Reading relay closure count To determine the closure count of specific channels send this query via remote ROUTe CLOSe COUN Ct clist Here clist is the summary of channels For example to determine the closure count of channels 1 and 4 of a module in slot 1 the following query would be sent ROUT CLOS COUN 101 104 The following query would determine the closure count of slot 1 module channels through 10 ROUT CLOS COUN 101 110 3 8 Routine Maintenance Model 2701 Service Manual Resetting relay closure count NOTE The Model 2701 must be in the manufacturing calibration mode to reset the closure coun
168. ry calibration points and are valid only in manufacturing calibration mode 4 Calibration Reference Model 2701 Service Manual Miscellaneous calibration commands Miscellaneous commands perform miscellaneous calibration functions such as program ming the calibration code and date These commands are discussed in detail in the following paragraphs CODE CALibration PROTected CODE Purpose Format Parameter Description To program the calibration code or password so that you can perform the calibration procedures calt prou code strange Up to a 8 character string including letters and numbers The CODE command enables the Model 2701 calibration procedures when performing these procedures over the bus In general this command must be sent to the unit before sending any other comprehensive or manufacturing calibration command The default calibration code is KI002701 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 COUNT CAL PROT CODE 1002701 Send default code of KI002701 CALibration PROTected COUNt Purpose Format Response Description To determine how many times the Model 2701 has been calibrated Cala DEOL scour l
169. s and FAST 10ms AC General AC CMRRs 70dB VOLT HERTZ PRODUCT lt 8 x 107 AC MEASUREMENT SPEEDS Single Channel 60Hz 50Hz Operation Function Digits Readings s Rate Bandwidth ACV ACI 6 5 2s Reading SLOW 3 Hz 300 kHz 6 5 4 8 4 MED 30 Hz 300 kHz 6 5 40 32 FAST 300 Hz 300 kHz Frequency 6 5 1 1 SLOW 3 Hz 300 kHz Period 5 5 9 9 MED 30 Hz 300 kHz 4 5 35 35 FAST 300 Hz 300 kHz 4 510 65 65 FAST 300 Hz 300 kHz Multiple Channel 7703 SCANNING ACV 180 s 7703 Scanning ACV with Auto Delay on 2s reading AC SYSTEM SPEEDS 7911 RANGE CHANGES 4 5 3 5 FUNCTION CHANGES 4 5 3 5 AUTORANGE TIME 3s ASCII READINGS TO RS 232 115 2k baud 300 s EXTERNAL TRIGGER RATE 2000 5 Specifications are subject to change without notice AC Notes 1 20 overrange except on 750V and 2 Specification are for SLOW mode and sine wave inputs gt 5 of range SLOW and MED are multi sam ple A D conversions FAST is DETector BANDwidth 300 with nPLC 1 0 3 Applies to 0 18 C and 28 50 C 4 square wave inputs gt 10 of ACV range except 100mV range 100mV range frequency must be gt 10Hz if input is lt 20mV 5 Applies to non sine waves gt 5Hz lt 500Hz Crest factor greater than 4 3 is guaranteed by design only 6 For 1kQ unbalance in LO lead 7 Speeds are for 60Hz 50Hz operation using factory defaults operating conditions RST Autorange off Display off
170. s controlled by crystal Yl MPU RESET is per formed momentarily on power up Memory circuits Up is the flash memory that stores the firmware code for instrument operation and SDRAM U3 provides temporary storage for the MPU A battery watchdog control automatically senses when the 5VD supply is being powered down and then switches to the lithium ion battery for power Battery charge 15 maintained by 04 and associate components Real time clock 07 18 the real time clock The clock runs from main power and switches to two 0 33F capac itors C43 C44 on power down and can hold the time for up to six months Model 2701 Service Manual Troubleshooting 4 9 RS 232 interface Serial data transmission and reception is performed by the TXD and RXD lines of the MPU U15 provides the necessary voltage level conversion for the RS 232 interface port Trigger circuits Buffering for Trigger Link input and output is performed by U14 and 120 Trigger input and output is controlled by FPGA U9 under MPU supervision Digital U23 U24 make up the digital input output Digital is controlled by the 1 9 under MPU supervision Module slot control U13 and U21 make up the control circuitry that allows communication of relay data to Slot 1 or Slot 2 Ethernet interface U10 is a NET ARM 32 bit RISC processor that supervises Ethernet port operation This IC includes an integrated 10 100BaseT MAC as well as numerous other features such as
171. sense lead is detected the front panel will display OVRFLW The second type of open sense lead detection is implemented in software This function works for the SENSE HI and SENSE LO leads The SENSE HI and SENSE LO leads will drift negative when disconnected due to small leakage currents These leads when operating prop erly will always have a positive voltage on them and when disconnected they will drift to neg ative voltages The open lead sense software monitors the voltage at these inputs and will trip the open sense detect when the inputs drift to 15mV When the open sense condition is detected the front panel will display OVRFLW Figure 4 4 Ohms open lead sense detection block diagram SENSE HI Software Detect INPUT HI C Hardware Detect DUT A Current Source lt Analog INPUT LO w Software Detect SENSE LO Scanner card signals Scanner card input signals are connected directly to installed scanner cards Scanner card output signals are routed internally to the INPUTS switch which selects between the front panel terminals and the scanner card outputs Model 2701 Service Manual Troubleshooting 4 13 Troubleshooting Troubleshooting information for the various circuits is summarized below See Principles of operation on page 4 5 for circuit theory Display board checks If the front panel DISP tests show a failure troubleshoot the dis
172. ssembly 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 5 6 Disassembly Model 2701 Service Manual Using a thin bladed screwdriver pry the plastic PC board stop located at the bottom of the display board until the bar separates from the casing Pull the display board from the front panel Remove the switch pad by pulling it from the front panel Removing power components The following procedures to remove the power transformer power module and fan require that the case cover and motherboard be removed as previously explained Power transformer removal Perform the following steps to remove the power transformer l Remove the motherboard Remove the two nuts that secure the transformer to the side of the chassis Pull the black ground wire off the threaded stud and remove the power transformer from the chassis Power module removal Perform the following steps to remove the power module x Remove the motherboard Remove the POWER switch rod Remove the card cage See Card cage removal on page 5 5 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 si
173. supply block diagram Figure 4 2 Digital circuitry block diagram Figure 4 3 Analog circuitry block diagram Figure 4 4 Ohms open lead sense detection 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 C66 C205 2 214 018 i 019 025 3 3VD O D Common CR104 C156 5VD C274 C274 C281 U144 SD Common O 37V CR116 CR117 C104 U101 O D Common Line p F ower Voltage ower L Switch Select Transformer C 418V Switch CR102 Cy TEN C131 C148 2 Common 10119 UT125 O 15V O 18V O 5V O A Common 4 6 Troubleshooting Model 2701 Service Manual AC power is applied to the AC power module receptacle Power is routed through the line fuse and line voltage selection switch of the power module to the power transformer The power transformer has a total of four secondary windings for the various supplies voltage for the display filaments is taken from a power transformer secondary at F1 and F2 then routed to the display board Each DC supply uses a rectifier and a capacitive filter and many supplies use an IC regula tor Table 4 2 summarizes rectifier filter and regulator circuits for the various DC supplies Table 4 2 Power supply components 5 C156 C273 C274 C281 3 3VD
174. t To do so press and hold the OPEN key while turning on the power then send the CAL PROT CODE code to unlock calibration default code KI002701 After resetting relay counts send CAL PROT LOCK to lock out calibration To reset the relay closure count of specific channels to 0 send this command via remote ROUTe CLOSe RCOunt clist Again clist is the summary of channels to be reset For example the following command resets channels 2 and 7 of a module in slot 1 to 0 ROUT CLOS RCO 102 107 The following command resets the count of slot 1 module channels 1 through 10 ROUT CLOS RCO 101 110 Setting count update interval Relay closure counts are updated in temporary RAM every time a channel is closed regardless of how it was closed by a SCPI command front panel control or during a scan These counts are permanently written to the EEPROM on the card only at a user settable time interval which has a factory default of 15 minutes or whenever the counts are queried Valid intervals set in integer number of minutes are between and 1440 minutes 24 hrs Relay closures are counted only when a relay cycles from open to closed state If you send multiple close commands to the same channel without sending an open command only the first closure will be counted The lower the interval the less chance there is of losing relay counts due to power failures However writing to the EEPROM more often may reduce scanning t
175. t n gt Calibration count The COUNT 2 command allows you to determine how many times the Model 2701 has been calibrated NOTE Use the COUNt command to help you monitor for unauthorized calibration procedures Example CAL COUN Request calibration count Model 2701 Service Manual Calibration Reference B 5 CALibration PROTected INITiate Purpose To initiate comprehensive and factory calibration procedures Format cal prot init Parameter None Description The INIT command enables Model 2701 calibration when performing these procedures over the bus This command must be sent to the unit after sending the CODE command but before sending any other calibration command NOTE The ZNITcommand should be sent only once before performing either DC AC or factory calibration Do not send INIT before each calibration step Example CAL PROT INIT Initiate calibration LOCK CALibration PROTected LOCK Purpose To lock out comprehensive or manufacturing calibration Format cal prot lock Parameter None Description The LOCK command allows you to lock out both comprehensive and manufacturing calibration after completing those procedures Thus LOCK performs the opposite of enabling calibration with the CODE command NOTE unlock comprehensive calibration send the CODE command To unlock manufacturing calibration hold in the OPEN key while turning on the power Example CAL PROT LO
176. tal circuitry 4 8 block diagram 4 7 Digital circuitry checks 4 14 K Digital I O 4 9 Disassembly 5 1 Disassembly procedures 5 4 DISP test 4 4 L Display 4 8 Display board 4 6 Display board checks 4 13 Environmental conditions 1 3 2 2 Error queue B 24 Error summary B 22 Extender board connections 2 22 factory defaults restoring 1 5 Factory service 6 2 frequency Verifying Model 2700 1 18 verifying Model 7700 1 31 Front panel disassembly 5 5 tests 4 4 Front panel Model 7700 calibration 2 22 fuse front terminal replacing 3 4 Power line 3 3 fuses plug in module replacing 3 5 Handling and cleaning 5 2 Handling PC boards 5 2 IEEE 488 interface 4 9 INPUT HI 4 10 Input terminal wire colors 5 7 Instrument reassembly 5 7 Introduction Calibration 2 2 Calibration Reference B 2 Disassembly 5 2 Performance Verification 1 2 Replaceable Parts 6 2 Routine Maintenance 3 2 troubleshooting 4 2 Key matrix 4 8 KEY test 4 4 limits ACI Model 2700 1 13 DCI Model 2700 1 12 Plug in module ACI Model 7700 1 24 Plug in module DCI Model 7700 1 23 plug in module resistance verification Model 7700 1 26 resistance verification Model 2700 1 15 line fuse replacing 3 2 Line power 1 3 2 2 line voltage setting 3 2 Maintenance Routine 3 1 Manufacturing calibration 2 19 Extender board preparation 2 19 front panel 2 20 Recommended test equipment 2 19 remote 2 21 Unlocking manufacturing calibration 2 19 measurem
177. te for most applications Model 2701 Service Manual Performance Verification 1 5 Verification limits The verification limits stated in this section have been calculated using only the Model 2701 one year accuracy specifications and they do not include test equipment uncertainty If a particular measurement falls slightly outside the allowable range recalculate new limits based on both Model 2701 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 2701 one year accuracy specification for 10V DC of 30ppm of reading 5ppm of range the calculated limits are Reading limits 10V 10V x 30ppm 10V x 5ppm Reading limits 10V 0 0003 0 00005 Reading limits 10V 0 00035V Reading limits 9 99965V to 10 00035V Calculating resistance reading limits Resistance reading limits must be recalculated based on the actual calibration resistance values supplied by the equipment manufacturer Calculations are performed in the same manner as shown in the preceding example except of course that you should use the actual calibration resistance values instead of the nominal values when performing your calculations For example assume that you are testing the 10kQ range using an actual 10 03kQ calibration resistance value Using Mod
178. ted in Table 6 1 through Table 6 4 on the following pages Parts for the Model 7700 plug in module are listed in Table 6 5 For additional information on mechanical parts see the assembly drawings provided at the end of Section 5 Ordering information To place an order or to obtain information concerning replacement parts contact your Keithley representative or the factory see inside front cover for addresses When ordering parts be sure to include the following information Instrument model number Model 2701 Instrument serial number e 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 1 888 KEITHLEY for a Return Material Authorization RMA number Complete the service form at the back of this manual and include it with the instrument Carefully pack the instrument in its original packing carton Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label Component layouts Component layouts for the various circuit boards are provided on the following pages Model 2701 Service Manual Replaceable Parts 6 3 Table 6 1 Model 2701 motherboard parts list Circuit designation C1 C3 C6 C8 C10 C11 C13 C14 C16 C25 C27 CAP 1UF 20 50V CERAMIC C 418 1 C102 CAP 01UF 10 1000V CERAMIC C 64 01 C103 C111 C191 C19
179. 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 temperature SIM 023 Using the cursor and range keys set the reference junction temperature to 09 then press ENTER twice to complete the temperature configuration process Select the temperature function by pressing the TEMP key Source each of the voltages summarized in Table 1 7 and verify that the temperature readings are within limits Be sure to select the appropriate thermocouple type for each group of readings See step 2 above Thermocouple temperature verification reading limits Thermocouple type Applied DC voltage Reading limits 1 year 18 to 28 190 2 to 189 8 C 0 2 to 0 2 C 749 8 to 750 2 C 190 2 to 189 8 C 0 2 to 0 2 C 1349 8 to 1350 2 C Voltages shown are based on ITS 90 standard using 0 C reference junction temperature See text for pro cedure to set reference junction temperature Model 2701 Service Manual Performance Verification 1 17 RID temperature 1 Connect the precision decade resistance box listed in Table 1 1 to the Model 2701 INPUT and SENSE jacks using four wire connections See Figure 1 5 for similar connecting scheme Be sure the INPUTS switch is in the FRONT position 2 Configure the Model 27
180. the DC volts function by pressing the DCV key and set the Model 2701 to the 100mV range 3 Set the calibrator output to 0 00000mV DC and allow the reading to settle Enable the Model 2701 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 Applied DC voltage Reading limits 1 year 18 to 28 100 0000mV 99 9935 to 100 0065mV 1 000000V 0 999963 to 1 000037V 10 00000V 9 99965 to 10 00035V 100 0000V 99 9946 to 100 0054V 1000 000V 999 941 to 1000 059V Source positive and negative values for each range 1 10 Performance Verification Model 2701 Service Manual Verifying AC voltage Check AC voltage accuracy by applying accurate AC voltages at specific frequencies from the AC voltage calibrator to the Model 2701 inputs and verifying that the displayed readings fall within specified ranges CAUTION Do not exceed 1000V peak between front terminals INPUT HI and INPUT LO or 8 x 107 VeHz input because instrument damage may occur Follow these steps to verify AC voltage accuracy 1 Connect the Model 2701 HI and LO INPUT Jacks to the AC voltage calibrator as shown in Figure 1 2 Be sure the INPUTS switch is in the FRONT position Figure 1 2 Connections for Model 2701 AC volts verification A
181. 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 0402 and 0403 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 supplied by U144 5 VD and 0101 437V Key matrix The front panel keys 5401 5430 are organized into row column matrix to minimize the number of microcontroller peripheral lines required to read the keyboard A key is read by strobing the columns and reading all rows for each strobed column Key down data is interpreted by the display microcontroller and sent back to the main microprocessor using proprietary encoding schemes Digital circuitry Refer to Figure 4 2 for the following discussion on digital circuitry Main microprocessor U1 is an MCF5407 microprocessor that oversees all operating aspects of the instrument except the Ethernet interface see below The MPU has a 32 bit data bus and provides a 24 bit address bus It also has integrated peripheral support such as 16 bit I O an integral DRAM controller with SDRAM support and UARTS one of which is used for the RS 232 interface The MPU clock frequency of SOMHz i
182. tion The DATA query requests all the calibration constants Values are returned in one string of ASCII floating point values delimited by commands Example CAL PROT DATA Request cal constants Model 2701 Service Manual Calibration Reference B 9 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 Table B 2 DC calibration commands CALibration PROTected DC STEPI Front terminal short circuit STEP2 Open circuit STEP3 lt NRf gt 10 DC calibration step 9 to 11 STEPA lt NRf gt DC calibration step 9 to 11 STEP5 lt NRf gt 100V DC calibration step 90 to 110 STEP6 lt gt 1kQ 4 wire calibration step 900 to 1 1E3 STEP7 lt NRf gt 10 4 wire calibration step 9 to 11E3 5 8 lt NRf gt 100kQ 4 wire calibration step 90E3 to 110E3 5 9 lt NRf gt IMQ 4 wire calibration step 900E3 to 1 1E6 STEPIO lt NRf gt 10mA DC calibration step 9E 3 to 3 STEPII lt NRf gt 100mA DC calibration step 90E 3 to 110E 3 STEPI2 lt NRf gt DC calibration step 0 9 to 1 1 CALibration PROTected DC STEP1 Purpose To perform front terminal short circuit calibration Format cal prot de stepl Parameter None Description STEP1 performs the short circuit calibration step in the comprehensive calibration procedure Connect a low thermal short Model 8610
183. to verify DC current accuracy 1 Connect the Model 2701 AMPS and INPUT LO jacks to the calibrator as shown in Figure 1 3 Be sure the INPUTS switch is in the FRONT position Figure 1 3 Connections for Model 2701 DC current verification INPUT LO Calibrator Output DC Current Model 2701 KEITHLEY OUTPUT HI EA Model 2701 Ethernet Multimeter Data Acquisition System LO RAT R w OCOOO00000000 INPUTS F R H 1 EL FRONT REAR Presa 5 SEE om OO ITS ENTER l O j SHIFT AMPS OUTPUT Note Be sure calibrator is set for LO normal current output 2 Select the DC current measurement function by pressing the DCI key 3 Setthe Model 2701 for the 20mA range 4 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 to 28 C 20 0000mA 19 98840 to 20 011160mA 100 0000mA 99 8700 to 100 1300mA 1 000000A 0 999120 to 1 000880A 3 000000A gt 2 99628 to 3 00372A Source positive and negative currents with values shown f the Fluke 5725 amplifier is not available apply 2 2A from calibrator Reading limits for 2 2A input are 2 197240 to 2 202760 Model 2701 Service Manual Performance Verificatio
184. tor connections for manufacturing EU 2 20 Routine Maintenance FRR 3 3 Front terminal AMPS fuse 3 4 Model 7700 amps fuses 3 5 Troubleshooting Power supply block diagram 4 5 Digital circuitry block diagram 4 7 Analog circuitry block diagram 4 11 Ohms open lead sense detection block diagram 4 12 List of Tables 1 Table 1 1 Table 1 2 Table 1 3 Table 1 4 Table 1 5 Table 1 6 Table 1 7 Table 1 8 Table 1 9 Table 1 10 Table 1 11 Table 1 12 Table 1 13 Table 1 14 Table 1 15 2 Table 2 1 Table 2 2 Table 2 3 Table 2 4 Table 2 5 Table 2 6 Table 2 7 Table 2 8 Table 2 9 Table 2 10 Table 2 11 Table 2 12 Table 2 13 Table 2 14 3 Table 3 1 Table 3 2 Performance Verification Recommended verification equipment 1 4 DCV NANTES EET 1 9 ACV Re A 1 11 E 1 12 Ti 1 13 Limits for resistance verification 1 15 Thermocouple temperature verification reading limits 1 16 Four wire RTD temperature verification reading limits 1 17 Plug in module DCV reading limits 1 19 Plug in module ACV reading limits 1 21 Plug in modu
185. ults 1 5 Performing the verification test procedures 1 6 Verification test summary 1 6 Test considera ONS PT 1 7 Model 2701 VeriicallOfl ea 1 8 DC 1 8 Verifying AC voltage 1 10 IBD Ge 1 12 Verifying current 1 13 NOEIEVIDE Ele ton MU RAUS 1 14 Verifying temperat fe u uuu u u uuu 1 16 TEN 1 18 Model 7700 verification 1 18 en oe VONAR uuu uu u uu 1 18 Verifying voltage 1 20 VANDE Ge 1 22 Verifying AC current 1 24 NOEIEVIDE A NE ce rae 1 25 Verifying temperature uuu u u 1 28 TEN 1 31 Verifying ratio and average 1 32 2 Calibration rigo Sibi uro ID m 2 2 Environmental conditions 2 2 Warm up period 2 2 i POW CE 2 2 Calibration co
186. within its specifications and operating limits and for ensuring that operators are adequately trained Operators use the product for its intended function They must be trained in electrical safety procedures and proper use of the instrument They must be protected from electric shock and contact with hazardous live circuits Maintenance personnel perform routine procedures on the product to keep it operating properly for example setting the line voltage or replacing consumable materials Maintenance procedures are described in the manual The procedures explicitly state if the operator may perform them Otherwise they should be performed only by service personnel Service personnel are trained to work on live circuits and perform safe installations and repairs of products Only properly trained service personnel may perform installation and service procedures Keithley products are designed for use with electrical signals that are rated Installation Category I and Installation Category II as described in the International Electrotechnical Commission IEC Standard IEC 60664 Most measurement control and data I O signals are Installation Category I and must not be directly connected to mains voltage or to voltage sources with high tran sient over voltages Installation Category II connections require protection for high transient over voltages often associated with local AC mains connections Assume all measurement control and data I O connectio
187. xample CAL PROT CARD1 LOCK Lock out card 1 calibration OCK CALibration PROTected CARD1 LOCK Purpose To read Model 7700 calibration lock status Format cal prot cardl lock Response O Calibration locked Calibration unlocked Description The LOCK query requests status from the Model 2701 on Model 7700 calibration locked unlocked state Calibration must be enabled sending the CODE command before calibration can be performed Example CAL PROT CARDI LOCK Request card 1 cal lock state RCOunt CALibration PROTected CARD1 RCOunt Purpose To reset card calibration count to 0 Format cal prot cardl rco Parameter None Description The RCOunt command resets the card calibration count reported by COUNC 2 to 0 Example CAL PROT CARDI RCO Rest card calibration count Model 2701 Service Manual Calibration Reference B 21 CALibration PROTected CARD 1 SANE Purpose To save calibration constants in card EEROM after the calibration procedure Format cal prot cardl save Parameter None Description The SAVE command stores calculated calibration constants derived during Model 7700 calibration in card EEROM EEROM is non volatile memory Calibration constants will be retained indefinitely once saved Generally SAVE is sent after all other calibration steps except for LOCK NOTE calibration will be only temporary unless the SAVE command is sent to permanently store calibr
188. xternal sensing is to be turned on 2 Setthe calibrator to output DC volts and turn external sense off 3 Perform the steps listed in Table 2 3 to complete DC volts calibration For each calibra tion step Set the calibrator to the indicated value and make sure it is in OPERATE Press the ENTER key to calibrate that step e Wait until the Model 2701 finishes each step The unit will display the CALIBRATING message while calibrating Model 2701 Service Manual Calibration 2 9 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 2701 display value to match the calibrator output voltage Table 2 3 DC volts calibration summary Calibration step Calibrator voltage Allowable range 10 10 00000V 9V to 11V 10V 10 00000V 9V to 11V 100V 100 0000V 90V to 110V Resistance calibration Completing the 100V DC calibration step ends the DC voltage calibration procedure The Model 2701 will then prompt you to connect 1kQ Follow these steps for resistance calibration 1 Set the calibrator output for resistance and turn on external sense NOTE Use external sense 4 wire when calibrating all resistance ranges Be sure that the calibrator external sense mode is turned on 2 Perform the calibration steps summarized in Table 2 4 For each step Set the calibrator to the indicated value and place the unit in oper
189. y calibration required in the field e Manufacturing calibration Usually only performed at the factory unless the unit has been repaired e Model 7700 calibration Covers calibration procedures specific to Model 7700 cards WARNING The information in this section is intended only for qualified service per sonnel Do not attempt these procedures unless you are qualified to do so the procedures require accurate calibration equipment to supply precise DC and AC volt ages DC and AC currents and resistance values Comprehensive calibration can be performed any time by an operator either from the front panel or by using the SCPI commands sent either over the Ethernet port or the RS 232 port DC only and AC only calibration may be performed individually if desired Environmental conditions Conduct the calibration procedures in a location that has Anambient temperature of 18 to 28 C 65 to 82 F Arelative humidity of less than 8096 unless otherwise noted Warm up period Allow the Model 2701 Ethernet Multimeter Data Acquisition system to warm up for at least two hours before performing calibration If the instrument has been subjected to temperature extremes those outside the ranges stated above allow extra time for the instrument s internal temperature to stabilize Typically allow one extra hour to stabilize a unit that is 10 18 F outside the specified temperature range Also allow the test equipment to
190. y reading is between 999 9Hz and 1 0001kHz Figure 1 7 Connections for Model 2701 frequency verification BNC to Dual Banana Jack Model 2701 Adapter Function Generator KEITHLEY Integra Series Q 4 WIRE INPUT D PUT AVG CONT OCOM RIOD SENSOR 99 66 6 5 OG O 500 X Sa CCS 8 Coax Cable Function INPUT HI AND LO Output Model 7700 verification Use these procedures to verify measurement accuracy through the Model 7700 20 Channel Multiplexer Card NOTE Although the following tests are based on the Model 7700 20 Channel Multiplexer the same general procedures can be used for other plug in modules that have similar capabilities Refer to the Model 2701 User s Manual for specific information on ter minals and connections for other plug in modules Verifying DC voltage Check DC voltage accuracy by applying accurate voltages from the DC voltage calibrator to the Model 7700 input terminals and verifying that the displayed readings fall within specified limits CAUTION Do not exceed 300V DC between plug in module INPUT and L terminals or between any adjacent channels Model 2701 Service Manual Performance Verification 1 19 Follow these steps to verify DC voltage accuracy 1 Connect the Model 7700 CHI H and L INPUT terminals to the DC voltage calibrator as shown in Figure 1 8 NOTE Use shielded low thermal connections wh
191. y recommended that you send the unit back to the factory for repairs or limit repairs to the PC board replacement level Without proper equipment and training you could damage a PC board beyond repair Repairs will require various degrees of disassembly However it is recommended that the Front Panel Tests be performed prior to any disassembly The disassembly instruc tions for the Model 2701 are contained in Section 5 of this manual e 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 2701 These static sensitive devices require special handling as explained in Section 5 e Whenever a circuit board is removed or a component is replaced the Model 2701 must be recalibrated See Section 2 for details on calibrating the unit Model 2701 Service Manual Troubleshooting 4 3 Power on sel tests RAM and EPROM tests During the power on sequence the Model 2701 will perform a checksum test on its EPROM and test its RAM If the RAM tests fails the instrument will lock up Flash memory tests After the RAM and EPROM tests the instrument will perform a checksum test on flash memory If a failure occurs the unit will perform the comprehensive tests summarized in Table 4 1 If a failu
192. z 100 0000mV 1kHz 100mV AC at 50kHz 100 0000mV 50kHz 1V AC at 1kHz 1 000000V 1kHz AC at 50kHz 1 000000 50kHz 10V AC at IKHz 10 00000 1kHz 10V AC at 50kHz 10 00000 50kHz 100V AC at IKHz 100 0000V 1kHz 100V AC at 50kHz 100 0000 50kHz 700V AC at IKHz 700 000V 1kHz 2 12 Calibration Model 2701 Service Manual AC current calibration After the 700VAC at 1kHz point has been calibrated the unit will prompt you for 100mA at 1kHz Follow these steps for AC current calibration 1 Connect the calibrator to the AMPS and INPUT LO terminals of the Model 2701 as shown in Figure 2 3 2 Perform the calibration steps summarized in Table 2 7 For each step Set the calibrator to the indicated current and frequency make sure the unit is in OPERATE Press ENTER to complete each calibration step e 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 1 at IKHz 1 000000A 1kHz 2A at IKHz 2 000000A 1kHz Setting calibration dates and saving calibration At the end of the calibration procedure the instrument will display the CALIBRATION COMPLETE message Press ENTER to continue and the Model 2701 will prompt you to enter the calibration date and the calibration due date Set these dates as follows 1 Atthe CAL DATE prompt use the left and right arrow keys and the range keys to set

Model 2701Ethernet-Based DMM / Data Acquisition System Service

Contents

Download Pdf Manuals

Related Search

Related Contents