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KEI 2420 Service

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12. VU DG D G D G o 7 Y x L w N N Ne uA Noc SN N F Mo c b ael C e J ZA 0 2 7 2 Mr V M n w Iu Y gt o 9 i oN NO en gt 9 5 a0 C p dee
13. gt gt je Dj bel O ED m lt gt sul 63 C cd E nj VY s x 55 VE uw LL A ac gt x S a Nx e lt gt DE Lu _ n O x Z O Nc O O O KC CN AN IA Cr 15 gt lt J N KOFF BO PTH CHEC DEL 10 N TE NOT POPULATE APPROPIA e KU O a 2 1 p 5 60 _ _ Ost OO ay DO U w Neg W on on D
14. 2 7 1 001 0 2 LTR ECA ENG DATE vU G ON 57 11 24 99 ST M 2 25 D M MLH 3 27 00 D1 24764 STAKING DRAWING KK 7 26 00 RIMARY SIDE COMPONENTS SIDE 0 02 23537 UPDATED COMPONENTS VENDOR NO LM 1 9 01 3 26061 SEE PAGE 2 MS 9 14 D raa D E G m f 0518 N ES 4540 c R541 6543 FS FS f 0507 503 552 2 Y Yf 0521 V 0516 y Yy y 0514 2 2 00525 gt 0504 lt DE 9 051 536 517 502 0523 05426 85V x PEN n e 9520 R530 m 0541 1 05150 0 D Ha 2052 VR506 0501 0510 VR507 HS5 0535 t pr 20908 0 0 RU R532 e re ra 1 0 p Way 195 HS2 LJ 1 1 tod jot O ro ro 70 C560 J J L500 ol p eli 501 D 2 0522 2 5 m C526 R534D e e N EE 5 7
15. 260 0842 4 40x 2PPHSEM LTR ECA NO REVISION ENG DATE DETAIL A BJ WIRING mm FRONT PANEL AND REAR CHASSIS REF FRONT PANEL RED 4 40x5 8PPH mE X I BLA YEL TOM OI TSI CH 58 1A CHOKE 2001 367A HOLDER 2 REQ D RA Qe 5 SH PILOT LIGHT WIRES ON ANALOG BD L RED v CHOKE ASS Y e c nee Eee e A PILOT LIGHT REF REAR CHASSIS CWAT WHT RED CONNECTION 22 PLACE ALL THE WIRES FOR THE REAR PANEL BETWEEN THE CHOKES M REF SLIDE WIRE CHOKE ASS Y INTO THE HOLDER AS SHOWN DO THE SAME PROCESS FOR ALL THE WIRES TO THE FRONT PANEL 2 PLACES 9 NEC do calo ori ai SZ a SEE DETAIL B SEE DETAIL NOTE TAB TO THE TOP REF ANA BD WHT GRA CHOKE HOLDER ASS Y OF CHASSIS EDGE WHT BLK WHT BLU gt o os N 2430 040 FRONT PANEL ASSEMBLY ee lg CHASSIS REF SEE DETAIL A FOR BJ WIRING P a SLIDE THE BOTTOM LEG ON ONE SIDE OF HOLDER INTO THE CHASSIS THEN SLIDE THE OTHER LEG 0 INTO SLOT THEN SLIDE
16. E C 2 QN Si E ES LJ 5 ta lt i5 N it o m SEU s a gt Lo pad v Ly a Lu N a R485 E S lt 6 583 _ RA61 R459 R488 O O N x 2 R487 2 V R460 d 2 uUi gt Co M Em 5 x R462 O R484 O R7070 TE M 2 R586 R70 O 948 483 28 u B R463 n css2 C551 E C550 O D G ao x m C502 E 806 PES Ja Lu E e A Si heg j s Y R456 8489 d 6905 6504 O T 5 QV uw P ud un 5 C506 8472 z S i i O 5 F aloe R416 R458 n ue o lt Cels p R432 R526 R362 Ex a DIOS CS 343 S Ol r M A G O a AO T R595 2330 n R361 R133 se m us 2 o R705 O GAME R342 R134 8709 lt C329 R429 R106 R205 R341 332 R212 OO O R280 C323 R135 R703 c41 R337 C331 R355 Ci R598 DO dA R353 R136 R700 0701 e R525 R418 s R702 C309 5 PS C515 279 C305 9 R340 C409 KY C325 C285 R127 R43
17. c pu Lul s ket E x I T Al Al Da te pis 26 ES 1 x o T 2 5 Co OD co px EMI ES Es C Lu 52 T gt a an Scy Al E x lt N 99 lt mE ee ce G ORS T e 2 A gt 5 a c 2 s e N 28 23 21 gt gt i 5 kd 992 5 eI 2 5 M pia ju N 5 s cm t sg DET sa cileno di Sw ASI E 5 AN Zi j J ac 10000005 n lt E i ii ooo o N ep 5 Le a i 3 000000008 _ 0000000000 0000000000 MET cia 1000000 4 Do fe LI TN lt x 7 e gt LO 0 LES b S ed Al CJ 9 o o o po EN P1028 na 0000000000 0000000000 M i e jac NI Co o XT m gt EE I ed 755 to so qui 2 200000002 5 00000000000 z C c O 10000007 E lt
18. sees 4 5 Power supply block 2 4 6 Output state simplified schematic sess 4 7 Digital circuitry block diagram see 4 0 List of Tables l Performance Verification Recommended verification equipment 1 3 Maximum compliance values esee 1 8 Output voltage accuracy 1 10 Voltage measurement accuracy 1 11 Output current accuracy limits essen 1 13 Current measurement accuracy limits eee 1 14 Ohms measurement accuracy limits eee 1 16 2 Calibration Recommended calibration equipment 2 4 Calibration unlocked states 2 5 Front panel voltage 2 10 Front panel current calibration 2 13 Remote calibration command summary eee 2 15 Recommended CAL PROT SENS parameter ranges 2 16 Recommended CAL PROT SOUR parameter ranges 2 16 Voltage calibration initialization commands 2 18 Voltage range calibration commands sees 2 19 Current calibration initialization commands 2 20 Current range calibration commands eee 2 21 3 Routine Maintenance Powerline fuse m hehehe aie ety 3 3 4 Troubles
19. pe 6 79 I nd 0 a Es p 67 Pa o 5 fa N Oo eo e L e c 5 c 229 c E We NU E J uw LO Iw EI S 2 LJ o o o N 2 C o OF 5 eJ Q S eg P i EJ as C e E D V J N 2 122 O N AJ Y V A DA Jo Kat uU N lt 2 oll o st 2 OF 4 d nh o YY Mud S c o o 5 40 zd o 9 0 7 OJ ER 7 4 3 b 3 Kx My LY E 5 o SK A i o c KU NL uA o o e 9 a a SR 5 5 S C DEN lt o E VA TOY a e a T o LEN x je dm 25 5 oro 57 C C Cay Cy gt amp i DAS OO ce ee ee gt Ni Ww V V 95 VA 5 zs eJ S m lt s o uw o o 4 gt C o PES EO C E 6 NP NC 2 5 21 2 oO eus A CD ad a 62 LO e o 200 da r e c f 7 EN d E 5 N co 559 542 N 7N lan N van N N lan cc Sc o I A Saw SY a V V 5 52 o
20. o x 2 N 5 5 lt c 2 Q A C SECONDARY SIDE COMPONENTS SIDE 01 eT m ET VT MEC UNS SCALE 2 5 COMPON VO 7 T DIM ARE IN IN UNLESS OTHERWISE NOTED 3 2 TITLE COMPON LAYOUT 2 SMU DIM TOL UNLESS OTHERWISE SPECIFIED DIGITAL BOARD KEITHLEY INSTRUMENTS INC CLEVELAND OHIO 44139 01 ANG Set ww mE XXX s FRAC 1 6 Specifications SourceMeter Line Specifications 2400 2400 C 2410 2410 C 2420 2420 C 2425 2425 C 2430 2430 C 2440 2440 C SOURCE SPECIFICATIONS VOLTAGE PROGRAMMING ACCURACY Local or Remote Sense ACCURACY 1 Year NOISE PROGRAMMING 23 5 peak peak MODEL RANGE RESOLUTION rdg volts 0 1Hz 10Hz ALL 200 000 mV 5 uV 0 02 600 uV 5 pV 10pV 2430 2440 2 00000 V 50 0 02 600 uV 50 uV 2400 Only 20 0000 V 500 0 02 2 4 mV 500 uV 200 000 V 5mV 0 02 24 mV 5mV 24100nly 20 0000 V 500 uV 0 02 2 4 mV 500 1000 00 V 50mV 0 02 100 mV 20mV 24200nly 20 0000 V 500 uV 0 02 2 4 mV 500 60 0000 V 1 5 mV 0 02 7 2 mV 1 5mV 2425and 20 0000 V 500 uV 0 02 2 4 mV 500 2430 Only 100 0000 V 2 5mV 0 02 12 mV 2 5mV 24400nly 10 0000 V 500 uV 0 02 1 2 mV 250 uV 40 0000 V 5mV 0 02 4 8 mV 1mV TEMPERATURE COEFFICIENT 0 18 amp 28 50 C
21. o E PET LL LL LLBCBSDIDUI 4 D M Ex Ex md e JIRGA j gt Ca D G si Sio WES n se SIER ae s EIE abe 21 Loo o co Ld CO fe 00000000000 0000 5 eG 25 c ep dol ud hi TS gt ad m Es 77 _ 000000000 Te opu o m d or gt 6202569 Li gt Hmm 21 sss GN 3 e p oy c T 25 O v co co 2 Ex gt c Lo gt o gt 0000000007 90 EM i e lt D o E oo z x A T e fi 08 ps 5 ac in 200 5 E er TA lt B 2 E 2 wW S om Al HL INSTRUMENTS OHIO NENTS
22. 1 4 Example limits 1 4 Resistance limits 1 4 Restoring factory defaults aa 1 5 Performing the verification procedures 1 5 Test SUMM ary itato ittico 1 5 Test considerations ii 1 6 Setting the source range and output value 1 6 Setting the measurement range a aa 1 7 Compliance considerations 1 7 Compliance limits i 1 7 eei te teen t itu 1 7 Maximum compliance 1 8 Determining compliance limit esee 1 8 Taking the SourceMeter out of compliance 1 8 Output voltage 1 9 Voltage measurement aCCUracy i 1 10 Output current accuracy 1 11 Current measurement 1 13 Resistance measurement accuracy 1 15 2 Calibration Introd ction eee hee enero 2 2 Environmental conditions iii 2 2 Temperature and relative humidity ees 2 2 Warm up period cereo e e erc pietre rt eder gees 2 2 Line power neben e a ri 2 2 Calibration 2 3 Calibration cycle aaa ht atei 2 3 Re
23. 0 9 CR222 O x NVDRIVE CR201 p NES o glia au L 10227 none E tq in L 1CR220 i 0 DA em RARE D C402 0257 0229 e qa SEE 2 2 ER 1000 00 Ld n i e e N gt e 0401 1 s E E A gt O R381 ne SET ia 00005 no BAR CODE ll UUUUUUU O e nnnnmmm eio Q PP MERA sero iMac XXXXXXXXx R452 Ss UOUUUUUUU OK n N TN IN IN AN IN IN AN AN sl I a UE T R380 O 2 0000 S MN R383 00000000 0000000 s Soon Lonnnnnnn o sun mues 0651 me 1000 gge 00000000 2000000 R453 1000 x CR237 5 irj R651 R384 Ey spa s uu 0 0 4 DE T NSEHI Root a nnn 9 D000 65 00000000 0000000 e si T E R657 r vRe05 Raas 5 000 sl Sl nn 022211 T 070 f UUUU UUUUUUUU nnmmmmrm SIE Da TP208 LETT 5 0000000000 0000000000 A antc ar ut S L eD 00000000 NIDRIVE I M U662s 5 27389 3 HUUUUUUU 001 UUUUUUUU 127 ca 4 a 5 257 2102 0 0 0 0 00000000 e S S Z CN TP207 ns 0 9207 x 5 P gt 5 0 0000000 te ae EM uS 2 00000000 0403 a ol IDRIVE S E 0000000000 0000000 M A CR211 m R DA LL A oe n dui R401 DIE
24. 30 GROMMET STRIP 1 3 4 LONG SURFACE MAX 83 t 60 0596 ON C PROPERLY INSTALLED DETAIL A PUSH ROD m PUSH ROD DETAIL B SLIDE FUSE DRAWER LINE OUT OF LINE FILTER 84 25181 2430 140H2 Was 2430 140HI ST 6 6 01 LTR ECA NO REVISION ENG DATE gt 26003 2430 140H3 Was 2430 1 40H2 B 24496 2430 1406 Was 2430 014 11 ST 5710700 BI 23766 2430 140H Was 2430 1406 ST 5 18 00 B 25155 2420 004 WAS 2430 004 ST 11 8 00 md B3 2523 2430 140 1 WAS 2430 140H ST 12 12 00 104 313A PUSH ROD T SS REF DETAIL A SS BRN WIRE ASA FROM POWER 4 40x1 4PPH MODULE 5 REQ D 5 IN LBS 2430 140H3 DIGITAL BOARD ASSEMBLY TO INSTALL FUSE A 0 6 32KEPUT 8 IN LBS DRESS WIRE TOWARDS REAR PANEL AND AWAY FROM MOVING SPRING ON SWITCH REMOVE PAPER FROM TOP OF BEEPER ON BOARD 1 IR 2420 004 FAN ASSEMBLY BLU WIRE TT
25. L N Sag Tu FU 10873 15 FUSE 5 E d E P 4 SEE DETAIL B 8 FU 106 3 15 x 6 32x5 16PPHSEM 4 REQ D REF REAR i Wi E 8 IN LBS DARLE 2 BRN WIRE REF 227 7282 CS 725 SCREWLOCK FEMALE 2420 3184 INSULATOR z OLN lt 2 2 BP E m 5 113 IEEE HARDWARE KIT 77 la cr Da I REQ D 7 IN LBS SE 24 Ad gt 2420 004 CRIMP ASSEMBLY 2 POWER MODULE CHASSIS 428 319 FOOT 6 32x1 4PFH 8 IN LBS PART NUMBER QTY DESCRIPTION o 25 2420 004 CRIMP ASSEMBLY 2430 060 CHASSIS BJ ASSEMBLY 2430 060 2430 14083 DIGITAL BOARD ASSEMBLY DAMMANN CHASSIS BJ ASSEMBLY 428 3194 2 FOOT SEE DETAIL C 704 313A PUSH ROD CS T13 EEE HARDWARE KIT 4 40x 4PFH CS 125 4 SCREWLOCK FE 6 2 FOOT RUBBER e 2430 2430 052 Chassis Analog Board 557 FU 106 3 15 FUSE 3 15 AMP MODEL NEXT ASSEMBLY NEXT PROCESS STEP QTY 4 40x1 4PPA 5 PHIL PAN HEAD SCREW USED ON 6 32KEPNUT KEPNUT 6 32x1 4PFH 2 PHIL FLAT HEAD SCREW DO NOT SCALE THIS DRAWING ma ss r Ne 6 32x5 16PPHSEM PHIL PAN HEAD SEMS SCREW EHE CHASSIS ASSEMBLY 4 40 1 1 4 1 PHIL FLAT HEAD SCREW 015 ANG 51 DRN mat LS 4 40 4 KEP UT ei le Instruments Inc NO 2430 3184 INSULATOR KEITHLEY dade XXX 5 005 FRAC 1 68 MATERIAL 2430 051 SURFACE MAX FINISH _
26. 0 15 x accuracy specification C MAX OUTPUT POWER 22W 66W for Model 2420 110W for Model 2425 and 2430 55W for Model 2440 four quadrant source or sink operation SOURCE SINK LIMITS Model 2400 21V 1 05A 210V 105 mA Model 2410 21V 1 05A 1100 21 mA Model 2420 21V 3 15A 63V 1 05A Model 2425 21V 3 15A 105V 1 05A Model 2430 105V 1 05A 105V 10 5A pulse mode only Model 2440 10 5V 5 25A 42V 1 05A VOLTAGE REGULATION Line 0 01 of range Load 0 01 of range 100pV NOISE 10Hz 1MHz 10mV 50mV typ Models 2430 and 2440 OVER VOLTAGE PROTECTION User selectable values 596 tolerance Factory default none CURRENT LIMIT Bipolar current limit compliance set with single value Min 0 1 of range OVERSHOOT 0 196 typical full scale step resistive load 10mA range CURRENT PROGRAMMING ACCURACY Local or Remote Sense ACCURACY 1 Year NOISE PROGRAMMING 23 5 peak peak MODEL RANGE RESOLUTION rdg amps 0 1Hz 10Hz 2400 2410 1 00000 uA 50 pA 0 03596 600 pA 5pA ALL 10 0000 uA 500 pA 0 033 2 nA 5nA 100 000 uA 5nA 0 03196 20 nA 50 nA 1 00000 mA 50 nA 0 034 200 nA 500 nA 2400 2420 2425 10 0000 mA 500 nA 0 045 2 pA 50 pA 2430 2440 2410 Only 20 0000 mA 500 nA 0 045 4 pA 200 nA ALL 100 000 mA 5 pA 0 066 20 pA 1 pA 2400 2410 1 00000 A 50 pA 0 27 900 pA 100 pA 2420 2425 1 00000 50 pA 0 067 900 pA 50
27. 609 CR602 vego JW E m 0000000 E 5 CR400 5 cu 08810 TEE _ 20265 0407 0 341000000 00000000 0000000 0000000 0408 0 el 3 A di 3 C3 1610 070 e 10000000 010110006 00000000000N 2 Za co aa NS S ner 5 0000000 fg m E BT IFB 000000 000 5 R39 Cae T d Ugo u 232 E VR215 S P230 NA VREF ESL XR ca 0000000 VFB en VJ Ld O 5 i E 1 r ie n 00000000 50000 EA EXE x hae Dm 0 v EX gU0000000 0266 DE Ho Af mO 00 Dn D n ca i zl 8 94111 10000000 5 E 0248 0250 8 3 00000000000 ces o 07070 00236 000 0000 E cessi 283 910000000 3 0000000 s e RETO ia CEE 000000000000000000000 0000000 9 nnm inn Terz Q259 Hebe i e xls TAE 5 5 T CR213 UU 5 M 2 O 10000 0414 0412 AE o uu 305 of 9255 000 S SARE x of PI vR600 1000000 222 5 agp D i XR A 2 ORE 3 6 E 0239 Se L S gs a Ho AL cazas orse 0258 oo ru Fo fus SRI3y gt s cod E34 pep SISI 11000 ec 00 ILATED C330 n
28. lt SAVE LO CK CHANGE PASSWO RD Select EXECUTE and then press ENTER The instrument will display the following message I CAL Press ENTER to Output 10 000 Press ENTER The Model 2420 will source 10 and simultaneously display the fol lowing DMM 10 00000uA Use A V ENTER or EXIT Note and record the DMM reading and then adjust the Model 2420 display to agree exactly with the actual DMM reading Use the up and down arrow keys to select the digit value and use the left and right arrow keys to choose the digit position or use the number keys 0 9 Note that the display adjustment range is within 10 of the present range After adjusting the display to agree with the DMM reading press ENTER The instru ment will then display the following I CAL Press ENTER to Output 00 000uA Press ENTER The Model 2420 will source OmA and at the same time display the following DMM RDG 00 00000uA Use 4 A V ENTER or EXIT Note and record the DMM reading and then adjust the Model 2420 display to agree with the actual DMM reading Note that the display value adjustment limits are within 1 of the present range After adjusting the display value to agree with the DMM reading press ENTER The unit will then display the following I CAL Press ENTER to Output 10 000 Press ENTER The Model 2420 will source 10 and display the following DMM RDG 10 00000uA Use gt Y ENTER or EXIT
29. 200mV 200 000m V 199 676 to 200 324mV 2V 2 00000V 1 99946 to 2 00054 V 20V 20 0000V 19 9960 to 20 0040V 60V 60 0000V 59 9880 to 60 0120V Measure range coupled to source range when simultaneously sourcing and measuring voltage As measured by precision digital multimeter Use closest possible value and modify reading limits accordingly if necessary O utput current accuracy Follow the steps below to verify that Model 2420 output current accuracy is within specified limits The test involves setting the output current to each full range value and measuring the currents with a precision digital multimeter 10uA to 1A range accuracy 1 With the power off connect the digital multimeter to the Model 2420 INPUT OUTPUT jacks as shown in Figure 1 2 Figure 1 2 Connections for 104A to 1 range current verification tests Model 2420 Input LO 4 EH 8888 Digital Multimeter I Amps 2 Select the multimeter DC current measuring function 3 Pressthe Model 2420 SOURCE I key to source current and make sure the source output is turned on 1 12 Performance Verification Figure 1 3 Connections for 3A range current verification tests Verify output current accuracy for the 1OWA 1A range currents listed in Table 1 5 For each test point Se
30. 6 16 Replaceable Parts Table 6 2 cont Digital board parts list Circuit designation Description ia U2 IC MICROMANAGER DS12365 10 IC 884 U20 IC OCTAL INTERFACE BUS 75160 IC 646 U21 IC DUAL POWER MOSFET DRIVER IC 437 TSC426 U22 IC DUAL D TYPE F F 74HC74 IC 773 U23 25 IC POS NAND GATES INVERT 74HCT14 656 U24 IC TRIPLE 3 IN NAND 74F10 IC 659 U26 IC VOLTAGE REGULATOR LM340 12 IC 60 U3 MICROCONTROLLER MC68332 FC LSI 161 U4 IC 5V RS 232 TRANSCEIVER MAX202 IC 952 US IC OP AMP AD705JR IC 814 U6 IC OCTAL INTER BUS TRANS 75161 IC 647 U7 IC 4 CHANNEL PWR DRIVER 2549B IC 1044 U8 INTEGRATED CIRCUIT IC 1113 U9 IC HEX INVERTERS 74HCT04 IC 880 VRI DIODE ZENER 33V 4752 DZ 68 YI CRYSTAL FSM327 41 Order current firmware revision level Replaceable Parts Table 6 3 Display board parts list Circuit designation Description 901 CAP 22UF 20 6 3 TANTALUM C 417 22 C902 904 907 908 910 CAP 1UF 20 100 CERAMIC C 436 1 C903 905 906 909 911 CAP 1UF 2096 50V CERAMIC C 418 1 C912 2 2UF 20 100 ALUM ELEC 503 2 2 913 914 1000 20 16 TANTALUM 504 100 915 916 33PF 10 100V CERAMIC C 451 33P 901 904 DIODE SWITCHING 250MA BAV103 RF 89 CR905 906 DIODE SWITCHING MMBD914 RF 83 DS901 VACUUM FLUORESCENT DISPLAY DD 51C J1032 CONN BERG CS 339 J1033 CONN HEADER STRAIGHT SOLDER CS 368 16 PIN Q901 902 TRANS NPN G
31. E C90 10000000000 R908 C916 M905 GROUND E 2001 352 NOTE FOR MORE COMPONENT INFORMATION REFER COMPONENT TO 2400 PRODUCT STRUCTURE i E i ie ui m 521 E eue USED ON 4 IM posce Ta D E F lt 1
32. SourceMeter Line Specifications 2400 2400 C 2410 2410 C 2420 2420 C 2425 2425 C 2430 2430 C 2440 2440 C MEASURE SPECIFICATIONS 27 CONTACT CHECK SPECIFICATIONS VOLTAGE MEASUREMENT ACCURACY Local or Remote Sense PE ACCURACY 1 Year SPEED 3501 for verification and notification DEFAULT INPUT 23 C 5 CONTACTCHECK 20 150 500 MODEL RANGE RESOLUTION RESISTANCE rdg volts No contact ALL 200 000 mV 1 uV gt 10 60 0 012 300 check failure 1 000 13 50 47 50 2 00000 V 10 pV gt 10 GQ 0 012 300 Always contact 2400 20 0000 V 100 gt 10 GQ 0 015 1 5 mV check failure 23 000 216 50 252 50 200 000 V 1 mV gt 10 GQ 0 015 10 mV 2410 20 0000 V 100 uV gt 10 GQ 0 01595 1 mV 1000 00 V 10 mV gt 10 GQ 0 01595 50 mV 2420 2425 2430 20 0000 V 100 uV 10 GO 0 01595 1 mV 2420 60 0000 V 1 mV gt 10 GQ 0 01595 3 mV 2430 100 000 V 1 mV 10 GO 0 015 5 mV 2440 10 0000 V 100 uV gt 10 GQ 0 015 750 40 0000 V 1 mV gt 10 GQ 0 015 3 mV TEMPERATURE COEFFICIENT 0 18 amp 28 50 C 0 15 x accuracy specification C CURRENT MEASUREMENT ACCURACY Local or Remote Sense ACCURACY 1 Year DEFAULT VOLTAGE 23 5 MODEL RANGE RESOLUTION BURDEN rdg amps 2400 2410 1 00000 pA 10 pA lt 0 029 300 All 10 0000 pA 100 pA lt 0 027 700 100 000 pA 1nA lt ImV 0 025 6 nA 1 00000 mA 10 nA lt 1mV 0 02795 60 nA 2400 2420
33. 100MW THICK FILM R 418 82 5 R623 RES 10 10 100MW THICK FILM R 418 10 R650 651 RES NET 9K 1K MICRO DIVIDER TF 246 2 R652 665 RES 357 1 1OOMW THICK FILM R 418 357 R656 RES 6 04K 1 125W THIN FILM R 456 6 04K R657 658 RES 1 100MW THICK FILM R 418 1M R666 RES 12K 0 1 100MW THIN 237 2 FILM R703 153 154 RES 4 99K 1 1000MW THICK FILM R 418 4 99K R704 706 707 502 510 RES 1 100MW THICK FILM R 418 1K R710 RESISTOR R 474 065 RT200 POLYSWITCH PTC RESISTOR RT 17 RT500 THERMISTER PD 7MW DEG RT 8 1500V 613 74K TP218 225 CONN TEST POINT 5 553 TP500 510 TP227 228 230 235 200 CONN TEST POINT 5 553 215 U202 650 203 IC OP AMP LT1112 IC 1048 U204 229 IC 8 CHAN ANA MULTI IC 844 PLEXER DG408DY U205 407 IC HEX INVERTERS 74HCT04 IC 880 U209 215 IC QUAD COMPARATOR LM339D IC 774 U210 220 IC DUAL BIPOLAR OP AMP LT1124CS8 IC 955 U211 213 IC BIFET OP AMP AD712JR IC 834 U212 214 230 241 400 406 652 IC CMOS ANAL SWITCH DG444DY IC 866 U221 227 IC DIFF AMP AMPO3GP IC 988 U222 IC OP AMP LTC1050CS8 IC 791 U223 411 507 508 IC MOSFET DRIVER TLP591B IC 877 U226 659 IC 20V OP AMP LT1097S8 IC 767 6 9 6 10 Replaceable Parts Table 6 1 cont Analog board parts list Circuit designation Description part no U228 263 IC OP AMP LOW NOISE LT1007CS8 IC 949 U231 219 235 234 262 IC OP AMP LOW POWER AD795JR IC 1052 U238 201 IC CMOS AN
34. SOURCE ACCURACY Determined by settling time and source range specifications OUTPUT SETTLING TIME 0 1 800us typ source I 10A into 100 limited by voltage slew rate 5001 typ source 10A into 10 limited by voltage slew rate OUTPUT SLEW RATE Voltage 100 load 0 25 30 on 100V range 0 08V us 30 on 20V range 10A range Current 00 load 0 25 15 30 on 100V range 0 08A us 30 on 20V range 10A range 2400 2410 Only Specifications valid for continuous output currents below 105mA For operation above 105mA continuous for gt 1 minute derate accuracy 10 35mA above 105mA Full operation 1A regardless of load to 30 C 50 C for Model 2420 2440 Above 30 C 50 C for Model 2420 2440 ambient derate 35mA C and prorate 35mA Q load 4 wire mode For current sink operation on 1A 3A or 5A ranges maximum continuous power is limited to approximately 1 2 rated power or less depending on current up to 30 C ambient See power equations in the User s Manual to cal culate allowable duty cycle for specific conditions For sink mode to 100mA range accuracy is Model 2400 0 1596 offset 4 Models 2410 2420 2425 2430 2440 0 5 offset 3 For lA range accuracy is Model 2400 1 596 offset 8 Models 2410 2420 2425 2430 2440 1 5 offset 3 10A range only in pulse mode Limited to 2 5ms pulse width maximum 10 duty cycle maximum w A Rev A 5 17 01
35. negative zero positive full scale positive zero 0 2V 0 18 to 0 22 0 002 to 0 002 0 18 to 0 22 0 002 to 0 002 2V 1 8 to 2 2 0 02 to 0 02 1 8 to 42 2 0 02 to 0 02 20V 18 to 22 0 2 to 0 2 18 to 22 0 2 to 0 2 60V 50 to 65 0 5 to 0 5 50 to 65 0 5 to 0 5 10uA 9E 6 to 11E 6 1E 7 to 1 7 9E 6 to 11E 6 1E 7 to 1E 7 100uA 90E 6 to 110E 6 1E 6 to 1 6 90E 6 to 110 6 1E 6 to IE 6 ImA 0 9E 3 to 1 1E 3 1 5 to 1 5 0 9 3 to 1 1 3 1E 5 to 1E 5 10mA 9E 3to 11E 3 1E 4 to 1 4 9E 3 to 11E 3 1E 4 to 1E 4 100mA 90E 3 to 110E 3 E 3 to 1E 3 90 3 to 110 3 1 3 to 1E 3 1 0 9 to 1 1 1E 2 to 1 2 0 9 to 1 1 1E 2 to 1E 2 3A 2 7 to 3 15 3E 2 to 3E 2 2 7 to 3 15 3E 2 to 3E 2 Note Actual allowable parameter ranges are 50 of full range for zero parameters 75 of full scale to 150 of full scale for full range parameters but ranges listed above should be observed for optimum calibration B 8 Command Reference D ATA CALibration PRO Tected SEN Se D ATA CALibration PRO Tected SO U Rce D ATA Purpose To request the calibration constants for the active range Format cal prot sens data cal prot sour data Response Four comma separated ASCII floating point constants Description The CAL PROT SENS DATA and CAL PROT SOUR DATA queries re quest the calibration constants for the active range of the sense and source
36. 10V 5V 0 5V 3 TP202 SOURCE 10V SVMI 10V 1V 4 TP203 SOURCE 10V 10 5V 1V 5 TP213 SOURCE 10V OV 0 1V 6 TP218 OUTPUT COM TV 0 7V 7 TP219 OUTPUT COM TV 0 7V 8 TP214 SVMI OUTPUT ON 20V 20V 0 5V 9 TP232 Bench defaults 6 4V 0 6V Measured with respect to FCOM TP500 Measured with respect to OCOM TP501 Battery replacement WARNING Disconnect the instrument from the power line and all other equipment before changing the battery The volatile memories of the Model 2420 are protected by a replaceable battery when power is off Typical battery life is approximately 10 years The battery should be suspected if the instru ment no longer retains buffer data or user defined operating parameters such as instrument setups source memory and math expressions If the battery is absent or totally exhausted the display will show the Reading buffer data lost message shortly after the Model 2420 is switched on The battery is a 3V wafer type lithium cell Panasonic type BR 2330 or equivalent Keithley part number BA 46 which is located on the digital board Replacement of the battery requires removal of the case cover and analog board assembly See Section 5 Battery replacement precautions WARNING _ There is a danger of explosion if battery is incorrectly replaced Replace only with the same or equivalent type recommended by the manufacturer Dispose of used batteries according to federal state an
37. 110E 3 1E 3 to 1E 3 1A 0 9 to 1 1 1E 2 to 1E 2 0 9 to 1 1 1E 2 to 1 2 3A 2 7 to 3 15 3E 2 to 3E 2 2 7 to 3 15 3E 2 to 3E 2 Note Parameter steps for each range may be performed in any order but all four parameter steps for each range must be completed For optimum calibration use parameters within recommended limits Calibration 2 17 Remote calibration procedure Step 1 Prepare the Model 2420 for calibration 1 Connect the Model 2420 to the controller IEEE 488 interface or RS 232 port using a shielded interface cable 2 Turn the Model 2420 and the test equipment and allow them to warm up for at least one hour before performing calibration 3 Ifyou are using the IEEE 488 interface make sure the primary address of the Model 2420 is the same as the address specified in the program you will be using to send commands Use the MENU key and the COMMUNICATION menu to access the IEEE 488 address Step 2 Voltage calibration 1 Connect the Model 2420 to the digital multimeter see Figure 2 1 and select the multi meter DC volts function 2 Sendthe commands summarized in Table 2 8 in the order listed to initialize voltage cal ibration When the CAL PROT CODE command is sent the instrument will assume the operating states listed in Table 2 2 3 Perform the range calibration steps listed in Table 2 9 for all ranges For each range Send the SOUR VOLT RANG command to select the
38. 2 4 Calibration Table 2 1 Recommended calibration equipment Description Manufacturer Model Specifications Digital Multimeter Hewlett Packard DC Voltage 1V 5 6ppm HP3458A 10V 4 3ppm 100V 6 3ppm DC Current 10pA 25ppm 100 23ppm 1mA 20ppm 10mA 20ppm 100mA 35ppm 1A 110ppm Precision Resistor Isotec RUG Z 1R00 0 1 10 40 1 100W 90 day full range accuracy specifications of ranges required for various measurement points Necessary for calibration of 3A current range Resistor must be characterized to 300ppm or better using recom mended DMM before calibrating 3A range 10 resistor characterization The 10 resistor must be characterized to 300ppm or better before calibrating the current range Use the 4 wire ohms function of the DMM recommended in Table 1 1 to measure the re sistance value and then use that measured value to calculate the current during the 3A current range calibration procedure U nlocking calibration Before performing calibration you must first unlock calibration by entering or sending the calibration password as explained in the following paragraphs U nlocking calibration from the front panel 1 Press the MENU key and then choose CAL press ENTER The instrument will dis play the following CALIBRATIO N UNLO CK EXECUTE VIEW DATES lt q SAVE LO CK CHANG E PASSWORD Select UNLOCK and then press ENTER The instrument will display the
39. 2425 2430 2440 10 0000 mA 100 nA lt 1mV 0 035 600 nA 2410 20 0000 mA 100 nA lt 0 035 1 2 pA All 100 000 mA 1pA lt 0 055 6 pA 2400 2410 1 00000 10 pA lt 1mV 0 22 570 pA 2420 2425 2430 2440 1 00000 A 10 pA lt 1mV 0 060 570 pA 2420 2425 3 00000 A 10 pA lt 0 052 1 71 mA 2430 3 00000 10 pA lt 1mV 0 052 1 71 mA 10 0000 6 2440 5 00000 A 10 pA lt mV 0 10 3 42 mA TEMPERATURE COEFFICIENT 0 18 amp 28 50 C 0 10 x accuracy specification RESISTANCE MEASUREMENT ACCURACY Local or Remote Sense DEFAULT DEFAULT NORMAL ENHANCED TEST TEST CURRENT ACCURACY 23 C 5 C ACCURACY 23 C 5 C 5 DEFAULT CURRENT 2420 2425 1 YEAR rdg ohms 1 YEAR rdg ohms RANGE RESOLUTION 2400 2410 2430 2440 2400 2410 2420 2425 2430 2440 2400 0 20000 04 Source Ipce Meas Vace Source Ipce Meas Vicc Source Meas Vice Source Ipce Meas 2 00000 4 10 1 X Source lc Meas Vace Source I cc Meas Vacc 0 17 40 0003 Q Source Inco Meas Vicc 20 0000 100 100 mA 100 mA 0 10 0 003 0 11 0 006 0 10 0 003 Q 0 07 0 001 200 000 Q 1mQ 10 mA 10 mA 0 08 0 03 Q 0 09 0 1 Q 0 08 0 03 Q 0 05 0 01 2 00000 10 mQ 1 mA 1 mA 0 07 03 0 08 06 Q 0 07 030 0 05 010 20 0000 kQ 100 mQ 100 pA 100 pA 0 06 3 Q 0 07 6 Q 0 06 3 Q 0 04 10 200 000 10 10 pA 10 pA 0 07 30 Q 0 07 60
40. Note and record the DMM reading and then adjust the Model 2420 display to agree with the DMM reading Again the maximum display adjustment is within 10 of the present range After adjusting the display value to agree with the DMM reading press ENTER and note that the instrument displays I CAL Press ENTER to Output 00 000 2 12 Calibration Figure 2 3 range current calibration test connections 16 17 18 19 20 21 22 23 Press ENTER The Model 2420 will source OuA and simultaneously display the following DMM 00 00000uA Use 4 A V ENTER or EXIT Note and record the DMM reading and then adjust the display to agree with the DMM reading Once again the maximum adjustment is within 1 of the present range After adjusting the display to agree with the DMM reading press ENTER to complete calibration of the present range Press EXIT to return to normal display and then select the 100 source range use the EDIT and up RANGE keys Repeat steps 2 through 18 for the 100 range After calibrating the 100 range repeat the entire procedure for the mA through ranges using Table 2 4 as a guide Be sure to select the appropriate source range with the EDIT and up RANGE keys before calibrating each range After calibrating the range connect the 10 characterized resistor and DMM to the Model 2420 INPUT OUTPUT jacks as shown in Figure 2 3 Select the DMM DC volts func
41. The offline switching power supply provides all power for the instrument while providing universal inputs and power factor correction for the 110 120V line The digital board runs off of 5V and 12V supplies derived from the switcher The 12VD supply is set to program the flash ROM See Digital circuitry below A constant frequency switching supply runs off the 24VD supplies and generates all the float ing and output supply voltages for the analog board 5V and 15V 42V and 85V Output stage Figure 4 4 shows a simplified schematic of the output stage Figure 4 4 r o485V Output stage simplified 7 0500 HI Drive xz 7 STE 442v 15VfAW Maindrive 15Vf AM Q523 H E I 0525 H H 1 Q507 H 42V rH 0503 Bes 4 85 4 8 Troubleshooting The Model 2420 output stage serves two purposes 1 it converts signals from floating com mon to output common and 2 it provides both voltage and current amplification The output stage drive transistors are biased in class B configuration to prevent the possibility of thermal runaway with high current output values Output transistors 0518 and 0521 are cascoded with output MOSFETs Q516 and 0523 other MOSFETS and transistors are slaves and the voltages across these devices are determined by the resistor capacitor ladder circuits shown High current drive capabil
42. This error generally occurs when the Model 2420 source circuitry is defective Command Reference B 9 Error 505 Will occur when a CAL PROT SOUR command generates an invalid source off set calibration constant Error 506 Will occur when a CAL PROT SOUR command generates an invalid source gain calibration constant Error 507 Will occur when a CAL PROT SENS command generates an invalid measure ment offset calibration constant Error 508 Will occur when a CAL PROT SENS command generates an invalid measure ment gain calibration constant Table B 4 Calibration errors Error Error message 4500 Date of calibration not set 4501 Next date of calibration not set 502 Calibration data invalid 503 DAC calibration overflow 504 DAC calibration underflow 4505 Source offset data invalid 506 Source gain data invalid 507 Measurement offset data invalid 508 Measurement gain data invalid Status byte EAV Error Available bit Whenever an error is available in the error queue the EAV Error Available bit bit 2 of the status byte will be set Use the STB query to obtain the status byte then test bit 2 to see if it is set If the EAV bit is set an error has occurred and you can use the appropriate error query to read the error and at the same time clear the EAV bit in the status byte Generating an SRQ on error To program the instrument to generate an IEEE 488
43. Unlock cal if cal is unlocked changes password Default password KI002420 COUNT Query number of times 2420 has been calibrated SAVE Save calibration data to EEPROM LOCK Lock calibration inhibit SAVE command operation LOCK Request cal lock status 0 unlocked 1 locked DATE lt y gt lt m gt lt d gt Program calibration year month day DATE Query calibration year month day NDUE lt y gt lt m gt lt d gt Program calibration due year month day NDUE Query calibration due year month day SENSe lt nrf gt Calibrate active measure range DATA Query measurement cal constants for active range SOURce lt nrf gt Calibrate active source range DATA Query source cal constants for active range Calibration data will not be saved if 1 Calibration was not unlocked with CODE command 2 Invalid data exists For example cal step failed or was aborted 3 Incomplete number of cal steps were performed For example omitting a negative full scale step Ranges that were successfully calibrated will be saved if calibration is unlocked Ranges that failed will not be saved Command Reference B 3 Miscellaneous commands Miscellaneous commands are those commands that perform such functions as saving calibra tion constants locking out calibration and programming date parameters CODE CALibration PRO Tected CO D E Purpose To unlock calibration so that you can perform th
44. _2 A ew uz CR524 S R542 R539 R538 SL 0503 0500 C556 DIS O 9528 3 007 2 OO C535 OK C 62 0 0 C522 C523 8 _ 0501 gt 8533 m 0533 N A 45 00 0 lt 0504 o O EN 6503 8 LEP RS ell HUD 5 5 55 5 54 C Y C501 4 8 Ss TP505 42V 5 TE 4 59 9 Sigges usas 8546 Hox gt 9 0510 a da CHE ca EST 3 1 sew 0000 UU 1000 2 15900 508 0507 0503 C563 41028 5 0000000 22 F 5 32 EC j eO nn o vi 2 e00 D 16302 011 1000 R588 0540 c 1000000 LI _ TY R576 9 Kas C539 C537 C513 0502 rh VA 2 RASO 514 EU 0538 56 77 L MC612 ABEL 3 Eod Y V 0000000 0000000 s n D CR200 U000 0000 00000000 415 R689 R692 x Pire Y dre S OFT g S 5 0 5 Coe 3 5 AR pr GP 7 0221 NS tu _ SL SI D cR2030 S 5 0 1 0539 VR511 ATA cae cozze Ogog M000 zz 0000000 2000000 0000 Canon 00000000 ze o UJ os O ca ow a 2 IGUARD 427 C296 6 umts vc dE CR204 2 aa s S e C400 R289 303 CR223 SN roe De so ko 19 90000000 x 0000420 cer DE ou 09 9 0077 Bi SS gip AUS RS 3 s _ Q 0 9 0 0
45. and the left and right arrow keys enter the new password on the display 5 Once the desired password is displayed press the ENTER key to store the new password Changing the password by remote To change the calibration password by remote first send the present password and then send the new password For example the following command sequence changes the password from the KI002420 remote default to CAL CAL PRO T CO DE K1002420 CAL PRO T CO DE You can use any combination of letters and numbers up to a maximum of eight characters NOTE Ifyou change the first two characters of the password to something other than KI you will not be able to unlock calibration from the front panel Resetting the calibration password If you lose the calibration password you can unlock calibration by shorting together the CAL pads which are located on the display board Doing so will also reset the password to the factory default KI002420 See Section 5 for details on disassembling the unit to access the CAL pads Refer to the dis play board component layout drawing at the end of Section 6 for the location of the CAL pads Calibration 2 7 Viewing calibration dates and calibration count When calibration is locked only the UNLOCK and VIEW DATES selections will be acces sible in the calibration menu To view calibration dates and calibration count at any time 1 From normal display press MENU select CAL and
46. functions respectively The four returned constants are in ASCII floating point format delimited by commas Note To request the appropriate constants 1 select the source or sense function 2 choose the desired range and 3 send the desired DATA query Example SENS FUNC VOLT DC Select DC sense function SENS VOLT DC RANGE 0 2 Choose 200mV range CAL PROT SENS DATA Request cal constants Detecting calibration errors If an error occurs during any calibration step the Model 2420 will generate an appropriate error message Several methods to detect calibration errors are discussed below Reading the error queue As with other Model 2420 errors any calibration errors will be reported in the error queue You can read the error queue by using the SYST ERR query Error summary Table B 4 summarizes calibration errors These errors will occur under the following condi tions Error 500 501 These errors will occur if you do not set the calibration date or calibration due date Error 502 This error will occur when the CAL PROT SENS or CAL PROT SOUR com mand is sent with a parameter that cannot be placed into any of the defined numeric ranges Error 503 504 Will occur when the source compliance DAC calibration constants generate an invalid DAC setting of the source compliance DAC calibration constants are verified each time a CAL PROT SOUR command is processed and when the Model 2420 is first turned on
47. in required limits 1 2 3 With the power off connect the digital multimeter to the Model 2420 INPUT OUTPUT jacks as shown in Figure 1 1 Select the multimeter DC volts function Set the voltage source protection to NONE To do so press CONFIG then SOURCE V to access the CONFIGURE V SOURCE menu Select PROTECTION and set the volt age source protection limit to NONE Set the Model 2420 to both source and measure voltage by pressing the SOURCE V and MEAS V keys and make sure the source output is turned on Verify output voltage accuracy for each of the voltages listed in Table 1 4 For each test point Select the correct source range Setthe Model 2420 output voltage to the indicated value as measured by the digital multimeter Verify that the Model 2420 voltage reading is within the limits given in the table NOTE not be possible to set the voltage source to the specified value Use the closest possible setting and modify reading limits accordingly Repeat the procedure for negative source voltages with the same magnitudes as those listed in Table 1 4 Repeat the entire procedure using the rear panel INPUT OUTPUT jacks Be sure to select the rear panel jacks with the front panel TERMINALS key Performance Verification 1 11 Table 1 4 Voltage measurement accuracy limits Model 2420 source Model 2420 voltage reading and measure range limits 1 year 18 C 28 C
48. of the first digit are sequenced Eachdigit and adjacent annunciator is sequenced the pixels of the selected digit are on When finished abort the display test by pressing EXIT The instrument returns to the FRONT PANEL TESTS MENU Continue pressing EXIT to back out of the menu structure 4 4 Troubleshooting CHAR SET test The character set test lets you display all characters Perform the following steps to run the character set test 1 Display the MAIN MENU by pressing the MENU key Select TEST and press ENTER to display the SELF TEST MENU 3 Select DISPLAY TESTS and press ENTER to display the following menu FRONT PANEL TESTS KEYS DISPLAY PATTERNS CHAR SET 4 Select CHAR SET and press ENTER to start the character set test Press any key except EXIT to cycle through all displayable characters 5 When finished abort the character set test by pressing EXIT The instrument returns to the FRONT PANEL TESTS MENU Continue pressing EXIT to back out of the menu structure Principles of operation The following information is provided to support the troubleshooting tests and procedures covered in this section of the manual Refer to the following drawings Figure 4 1 Overall block diagram Figure 4 2 Analog circuitry block diagram Figure 4 3 Power supply block diagram Figure 4 4 Output stage simplified schematic Figure 4 5 Digital circuitry block diagram Overall block diagram Figure 4 1
49. 100 000mA 99 939 to 100 061mA 1A 1 00000A 0 99883 to 1 00117A 3A 3 00000A 2 99673 to 3 00327A Measure range coupled to source range when simultaneously sourcing and measuring current As measured by precision digital multimeter Use closest possible value and modify reading limits accordingly if necessary Current calculated as follows I V R where V is the DMM voltage reading and R is the character ized value of the 1Q resistor Performance Verification Resistance measurement accuracy Use the following steps to verify that Model 2420 resistance measurement accuracy is within specified limits This procedure involves applying accurate resistances from a resis tance calibrator and then verifying that Model 2420 resistance measurements are within re quired limits CAUTION Figure 1 4 Connections for resistance accuracy verification Before testing the 20 and 200 ranges make sure your resistance calibrator can safely handle the default test currents for those ranges see Model 2420 and calibrator specifications If not use the CONFIG OHMS menu to select the MANUAL source mode then set the source current to an appropriate safe value When using the manual source mode total resistance reading uncer tainty includes both Source I and Measure V uncertainty see specifications and calculated reading limits should take the additional uncertainty into ac count If using the Fluke 5450 resistance cali
50. 18 CAL PROT SENS DMM Reading Calibrate source function positive full scale 19 Check 2420 for errors 20 SOUR VOLT 0 0 Set output to OV 2 Take DMM reading Read actual output value 22 CAL PROT SOUR DMM Reading Calibrate source positive zero Perform complete procedure for each range where Range 0 2 2 20 and 60 and Source value 0 2 2 20 and 60 2 DMM Reading parameter is multimeter reading from previous step 3 Use SYST ERR query to check for errors Step 3 Current calibration 1 Connect the Model 2420 to the digital multimeter see Figure 2 2 and select the multi meter DC current function 2 Send the commands summarized in Table 2 10 in the order listed to initialize current cal ibration 3 Calibrate the 10 to 1 current ranges using the procedure summarized in Table 2 11 For each range Send the SOUR CURR RANG command to select the source and sense range being calibrated For example for the 1mA range the command is SO U R CURR RAN 1E 3 2 20 Calibration Program the source to output the negative full range value using the SOUR CURR command For example iSOUR CURR 1E 3 Note and record the multimeter reading Use the multimeter reading as the parameter for the CAL PROT SOUR and CAL PROT SENS commands For example a typical value for the 1mA range would be CAL PROT SOUR 1 025E 3 CAL PRO T SEN S 1 025E 3 Program the current sou
51. 2 2 20V 0 2 to 0 2 18 to 22 18 to 22 60V 0 5 to 0 5 50 to 65 50 to 65 104A 1E 7 to 1 7 9E 6 to 11E 6 9E 6 to 11E 6 100A 1E 6 to 1E 6 90E 6 to 110E 6 90E 6 to 110E 6 ImA 1 5 to IE 5 0 9E 3 to 1 1E 3 0 9E 3 to 1 1 3 10mA 1E 4 to 1E 4 9E 3 to 11E 3 9E 3 to 1 1E 3 100mA 1E 3 to 1E 3 90E 3 to 110E 3 90E 3 to 110 3 1A 1E 2 to 1E 2 0 9 to 1 1 0 9 to 1 1 3A 3E 2 to 3 2 2 7 to 3 15 42 7 to 43 15 Note Parameter steps for each range may be performed in any order but all three parameter steps for each range must be completed For optimum calibration use parameters within recommended limits Table 2 7 Recommended CALibration PROTected SOURce parameter ranges Second parameter Second parameter Third parameter Fours rango negative full scale negative zero positive full scale parameter positive zero 0 2V 0 18 to 0 22 0 002 to 0 002 0 18 to 0 22 0 002 to 0 002 2V 1 8 to 2 2 0 02 to 0 02 1 8 to 422 0 02 to 0 02 20V 18 to 22 0 2 to 0 2 18 to 22 0 2 to 0 2 60V 50 to 65 0 5 to 0 5 50 to 65 0 5 to 0 5 10uA 9E 6 to 11E 6 1E 7 to 1E 7 9E 6 to 11E 6 1E 7 to 1 7 1001A 90 6 to 110E 6 1E 6 to 1E 6 90E 6 to 110 6 1 6 to 1E 6 ImA 0 9E 3 to 1 1E 3 1E 5 to 1E 5 0 9 3 to 1 1 3 1E 5 to 1E 5 10mA 9E 3 to 1E 3 1E 4 to 1E 4 9E 3 to 1 1E 3 1E 4 to 1E 4 100mA 90E 3 to 110 3 1 3 to 1E 3 90E 3 to
52. 208 RES 768 1 100MW THICK FILM R 418 768 R212 RES 332 1 100MW THICK FILM R 418 332 R213 RES NET 5K 1 668A TF 243 5K R216 221 274 279 223 RES 20K 1 100MW THICK FILM R 418 20K R217 500 515 RES 121K 1 100MW THICK FILM R 418 121K R218 RES 80 6K 1 1000MW THICK FILM R 418 80 6K R219 220 222 230 231 373 374 616 RES 49 9K 1 100MW THICK FILM R 418 49 9K 700 701 R240 243 248 251 253 254 257 258 RES 4 99K 1 100MW THICK FILM R 418 4 99K 261 262 R241 242 249 250 653 664 RES 140K 1 100MW THICK FILM R 418 140K R265 266 311 RES 4 99K 1 1000MW THICK FILM R 418 4 99K 317 334 335 337 339 357 366 268 271 209 RES 1 100MW THICK FILM R 418 1M Table 6 1 cont Analog board parts list Replaceable Parts Circuit designation Description R272 273 346 348 511 512 RES 249K 1 100MW THICK FILM R 418 249K R280 RES 4 02K 1 100MW THICK FILM R 418 4 02K R283 287 297 299 349 350 RES 30 1K 1 100MW THICK FILM R 418 30 1K 352 457 461 R284 286 288 301 358 504 RES 10K 1 100MW THICK FILM R 418 10K 617 622 654 655 R289 303 RES 20K 1 125W THIN FILM R 456 20K R292 338 527 528 533 535 544 RES 100K 1 100MW THICK FILM R 418 100K 546 547 R294 296 RES 100K 1 125W THIN FILM R 456 100K R298 300 345 RES 150K 1 100MW THICK FILM R 418 150K R302 525 526 RES 0499 1 100MW THICK FILM R 418 0499 R308 RES 1 5K 1 100MW THICK FILM R 418 1 5K R332 423 429 430 6
53. 21 Fax 91 80 509 1322 ITALY Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 KOREA FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 130 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 9031 O Copyright 2001 Keithley Instruments Inc Printed in the U S A 11 01 Model 2420 SourceM eter Service M anual 01997 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Fifth Printing October 2001 Document N umber 2420 902 01 Rev E Manual Print History The print history shown below lists the printing dates of all Revisions and Addenda created for this manual The Revision Level letter increases alphabetically as the manual undergoes sub sequent updates Addenda which are released between Revisions contain important change in formation that the user should incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created all Addenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each new Revision includes a revis
54. 57 48 57 47 56 47 56 47 44 38 44 38 SINGLE READING OPERATION READING RATES rdg second for 60Hz 50Hz MEASURE SOURCE MEASURE5 SOURCE MEASURE PASS FAIL TEST 5 SPEED NPLC TRIGGER ORIGIN TO GPIB TO GPIB TO GPIB Fast 488 1 0 01 internal 537 140 135 Fast 488 2 0 01 internal 256 256 79 83 79 83 Medium 488 2 0 10 internal 167 166 72 70 69 70 Normal 488 2 1 00 internal 49 42 34 31 35 30 COMPONENT INTERFACE HANDLER TIME for 60Hz 50Hz 9 MEASURE SOURCE SOURCE MEASURE PASS FAIL TEST SPEED NPLC TRIGGER ORIGIN TO GPIB PASS FAIL TEST TO GPIB Fast 0 01 external 1 04ms 1 08 ms 0 5 ms 0 5 ms 4 82ms 5 3 ms Medium 0 10 external 2 55 ms 2 9 ms 0 5ms 0 5 ms 6 27ms 7 1 ms Normal 1 00 external 17 53 ms 20 9 ms 0 5ms 0 5 ms 21 31 ms 25 0 ms 1 Reading rates applicable for voltage or current measurements Auto zero off autorange off filter off display off trigger delay 0 and binary reading format 2 Purely resistive lead 1A and 10pA ranges 65ms 31000 point sweep was characterized with the source on a fixed range Pass Fail test performed using one high limit and one low math limit 5Includes time to re program source to a new level before making measurement Time from falling edge of START OF TEST signal to falling edge of END OF TEST signal 7 Command processing time of SOURce VOLTagelCURRent TRIGgered lt nrf gt command not included GENERAL NOISE REJECTION N
55. 6 Power supply checks 4 11 Principles of operation 4 4 Program C 1 Model 2420 Calibration Program C 4 Program C 2 Requesting calibration constants C 7 Reading the error queue B 8 Recommended calibration equipment 2 3 Recommended calibration parameters 2 15 Recommended test equipment 1 3 Remote calibration 2 14 Remote calibration commands 2 14 Remote calibration procedure 2 17 Remote error reporting 2 7 Removing power components 5 6 Repair considerations 4 2 Replaceable parts 6 2 Requesting calibration constants C 7 Resetting the calibration password 2 6 Resistance limits calculation 1 4 Resistance measurement accuracy 1 15 Restoring factory defaults 1 5 Routine maintenance 1 1 Setting the measurement range 1 7 Setting the source range and output value 1 6 Single range calibration 2 22 Software requirements C 2 Solder repairs 5 2 Source accuracy A 10 Specifications A 1 Static sensitive devices 5 3 Status byte EAV Error Available bit B 9 Taking the SourceMeter out of compliance 1 8 Temperature and relative humidity 2 2 Test considerations 1 6 Test summary 1 5 Troubleshooting 4 1 4 10 Types of compliance 1 7 Unlocking calibration 2 4 Unlocking calibration by remote 2 5 Unlocking calibration from the front panel 2 4 Using the OPC command B 10 Using the OPC query B 10 Verification limits 1 4 Verification test requirements 1 2 Viewing calibration dates and calibration count 2 7 Voltage me
56. 602 212 213 518 522 204 211 DIODE SWITCHING MMBD914 RF 83 239 CR237 DIODE DUAL SWITCHING BAV99L RF 82 CR520 521 ULTRAFAST POWER RECTIFIER RF 105 CR600 DIODE DUAL HSM 2822T31 RF 95 CR601 DIODE SCHOTTKY SD103C RF 113 HS1 HS5 400 HEAT SINK HS 38 J1027 CONN HEADER STRAIGHT SOLDER CS 368 16 PIN J1028 CONNECTOR HEADER STRAIGHT CS 368 14 SOLDER PIN J1029 CONN MALE 5 PIN MOLEX 42491 CS 784 5 J1034 LATCHING HEADER FRICTON SGL CS 724 3 Table 6 1 cont Analog board parts list Replaceable Parts Circuit designation Description 200 205 RELAY 1 FORMB AQV214S RL 176 K206 207 208 RELAY RL 207 K211 RELAY SURFACE MOUNT RL 188 L201 500 501 CHOKE SHIELD BEAD CH 52 L600 601 602 FERRITE CHIP 600 OHM BLM32A07 CH 62 L603 FERRITE CHIP 600 OHM BLM32A07 CH 62 Q200 207 240 241 TRANS N CHANNEL JFET SNJI32199 TG 294 Q208 210 212 214 216 218 TRANS NPN CATV SILICON MPSHI7 TG 221 0209 211 213 215 217 219 TRANS CURRENT REGULATOR CR430 TG 219 Q220 225 TRANS NPN SILICON MJE340 TG 209 Q221 226 TRANS PNP POWER MJE350 TG 210 Q222 224 TRANS N CHAN JFET SST4393 TG 263 0234 239 244 246 255 256 TRANS N MOSFET VN0605T TG 243 258 401 404 229 Q242 243 TRANS N CHAN MOSFET TN2540N8 TG 274 Q247 520 601 529 228 248 TRANS PNP MMBT3906L TG 244 Q249 TRANS NPN SILICON BC846BL TG 278 Q250 TRANS PNP BC 856BL TG 287 Q402 409 TRANS N CHAN DMOS FET TN2504N8 TG 261 Q403 406 407 408 TRANS N CHAN JFET SST10
57. Inspect the con necting cables test leads and jumpers for possible wear 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 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 Al 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 haz
58. Q 0 07 30 Q 0 05 10 Q 2 00000 MQ 8 10 Q 1 pA 1 pA 0 11 300 Q 0 12 600 Q 0 11 300 0 05 100 Q 20 0000 MO 100 Q 1 pA 1 uA 0 11 1kQ 0 12 24kQ 0 11 1kQ 0 05 500 Q 200 000 1 100 0 66 10 kQ 0 66 24 Source I cc Meas Vicc 0 35 5kQ gt 200 000 MQ4 TEMPERATURE COEFFICIENT 0 18 C amp 28 50 C 0 15 x accuracy specification SOURCE I MODE MANUAL OHMS Total uncertainty I source accuracy V measure accuracy 4 wire remote sense SOURCE V MODE MANUAL OHMS Total uncertainty V source accuracy I measure accuracy 4 wire remote sense 6 WIRE OHMS MODE Available using active ohms guard and guard sense Max Guard Output Current 50mA except 1A range Accuracy is load dependent Refer to White Paper no 2033 for calculation formula GUARD OUTPUT IMPEDANCE 0 10 in ohms mode Source Ipce Meas Vice Source Ipce Meas Vacc Source Meas Source Ipce Meas Vace 1 Speed Normal 1 PLC For 0 1 PLC add 0 005 of range to offset specifications except 200mV 1A 10A ranges add 0 05 For 0 01 PLC add 0 05 of range to offset specifications except 200mV 1A 10A ranges add 0 5 2 Accuracies apply to 2 or 4 wire mode when properly zeroed 3 4 wire mode Manual ohms only except 2420 2425 2430 2440 for 2Q range and 2410 or 2400 for 200MQ range 5 Source readback enabled offset compensation ON Also available on 2410 2420 2425 2
59. Range 60 PRINT 1 OUTPUT 24 CAL PROT LOCK PRINT 41 OUTPUT 24 SENS FUNC CURR DC PRINT 1 OUTPUT 24 SOUR FUNC CURR PRINT 1 OUTPUT 24 CAL PROT CODE KI002420 E 9 Loop for all volts ranges PRINT 1 OUTPUT 24 SOUR VOLT RANGE Range Range 00001 Initial range PRINT PRINT Model 2420 Current Calibration Constants PRINT DO Loop for all current ranges PRINT 41 OUTPUT 24 CAL PROT SENS DATA PRINT 41 ENTER 24 LINE INPUT 42 Data PRINT Data PRINT 41 OUTPUT 24 CAL PROT SOUR DATA PRINT 41 ENTER 24 PRINT 1 OUTPUT 24 SOUR CURR RANGE Range C 8 Calibration Programs LINE INPUT 2 Data PRINT Data Range Range 10 IF Range 9 AND Range 11 THEN Range 3 LOOP WHILE Range lt 3 PRINT 1 OUTPUT 24 CAL PROT LOCK Lock out calibration PRINT 1 OUTPUT 24 RST PRINT 1 LOCAL 24 CLOSE END Index 1Q resistor characteristics 1 3 2 4 converter 4 8 Accuracy calculations A 10 Active guard 4 8 Analog board removal 5 4 Analog circuitry checks 4 12 Analog circuits 4 4 Assembly drawings 5 3 Battery replacement 4 12 Battery replacement precautions 4 12 Battery replacement procedure 4 13 Calibration 1 1 Calibration considerations 2 3 Calibration cycle 2 3 Calibration equipment C 2 Calibration errors 2 7 Calibration programs C 1 Case cover removal 5 3 Changing the password 2 6 Changing the pass
60. X 10V 1mV 1 5mV ImV 2 5mV Thus the actual reading range is 10V 2 5mV or from 9 9975 to 10 0025V Current measurement calculations are performed in exactly the same manner using the perti nent specifications ranges and input signal values Source accuracy Source accuracy is calculated similarly except of course that source specifications are used As an example of how to calculate the actual source output limits assume that you are sourcing 0 7mA on the mA source range You can compute the reading limit range from source current one year accuracy specifications as follows Accuracy 0 034 of output 200nA offset 0 034 X 0 7mA 200nA 238nA 200nA 438nA In this case the actual current output range is 0 7mA 438nA or from 0 69956mA to 0 70044mA A 6 Specifications Command Reference B 2 Command Reference Introduction This appendix contains detailed information on the various Model 2420 remote calibration commands calibration error messages and methods to detect the end of each calibration step Section 2 of this manual covers detailed calibration procedures Command summary Table B 1 summarizes Model 2420 calibration commands These commands are covered in detail in the following paragraphs Table B 1 Remote calibration command summary Command Description CALibration Calibration subsystem PROTected Cal commands protected by password CODE lt password gt
61. display microcontroller that controls the VFD vacuum fluorescent display and interprets key data The microcontroller has four peripheral I O ports that are used for the various control and read functions Display data is serially transmitted to the microcontroller from the digital board via the line to the microcontroller PDO terminal In a similar manner key data is serially sent back to the digital board through the RXB line via PD1 The 4MHz clock for the microcontroller is gen erated on the digital board DS901 is the VFD vacuum fluorescent display module which can display up to 49 charac ters Each character is organized as a 5 x 7 matrix of dots or pixels and includes a long under bar segment to act as a cursor The display uses a common multiplexing scheme with each character refreshed in sequence U903 9904 the grid drivers and U901 and U905 are the dot drivers Note that dot driver and grid driver data is serially transmitted from the microcontroller PD3 and PC1 4 10 Troubleshooting The front panel keys 5901 5931 are organized into a row column matrix to minimize the number of microcontroller peripheral lines required to read the keyboard A key is read by strob ing the columns and reading all rows for each strobed column Key down data is interpreted by the display microcontroller and sent back to the main microprocessor using proprietary encod ing schemes Troubleshooting Troubleshooting i
62. either The SOURCE adjustment and left and right arrow keys The numeric keys Note that the source output value will be updated immediately you need not press ENTER when setting the source value Performance Verification 1 7 Setting the measurement range When simultaneously sourcing and measuring either voltage or current the measure range is coupled to the source range and you cannot independently control the measure range Thus it 18 not necessary for you to set the measure range when testing voltage or current measurement accuracy Compliance considerations Compliance limits When sourcing voltage you can set the SourceMeter to limit current from 10 to 3 15A Conversely when sourcing current you can set the SourceMeter to limit voltage from 0 2mV to 63V The SourceMeter output will not exceed the programmed compliance limit Types of compliance There two types of compliance that can occur real and range Depending on which value is lower the output will clamp at either the displayed compliance setting real or at the maximum measurement range reading range The real compliance condition can occur when the compliance setting is less than the high est possible reading of the measurement range When in compliance the source output clamps at the displayed compliance value For example if the compliance voltage is set to 1 V and the measurement range is 2V the output vo
63. four screws that secure the bottom cover then remove the cover from the bottom of the PC board NOTE When re installing the heat sink make sure that all clips are properly installed and centered on each pair of output transistors Digital board removal Perform the following steps to remove the digital board This procedure assumes that the an alog board assembly is already removed NOTE Inorderto remove the digital board the display board must first be removed 1 Remove the IEEE 488 Digital I O and RS 232 fasteners The IEEE 488 Digital I O and RS 232 connectors each have two nuts that secure the connectors to the rear panel Remove these nuts 2 Remove POWER switch rod At the switch place the edge of a flat blade screw driver in the notch on the pushrod Gently twist the screw driver while pulling the rod from the shaft 3 Unplug cables Unplug the display board ribbon cable Unplug the cables going to the power supply Unplug the rear panel power module cable The fan may need to be removed 4 Remove digital board Slide the digital board forward until it is free of the guide pins then remove the board During re assembly replace the board and start the IEEE 488 Digital I O and RS 232 connector nuts and the mounting screw Tighten all the fasteners once they are all in place and the board is correctly aligned 5 6 Disassembly Front panel disassembly Use the following procedures to remove t
64. maintenance of equipment for ensuring that the equip ment is operated within its specifications and operating limits and for ensuring that operators are adequately trained Operators use the product for its intended function They must be trained in electrical safety procedures and proper use of the instrument They must be protected from electric shock and contact with hazardous live circuits Maintenance personnel perform routine procedures on the product to keep it operating 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
65. of m HO x 9 R306 RESI VR203 VR202 UUUUUUUU ISENSELO N Lo Go D 234 CR239 O L 33 wi n 52 7 o s emo 5 1 na oo T qm EE O Si ooe R6000 ac 201 2 99 J E e tp CR60Q NO 1 m m e T ___ JaInnnnnnn 5 VR604 0000 0000 m 3 8 5 Sg xx 3 X 0 GND TP508 E VR408 VR407 5 LE M 15VF m 222 20 W205 R SOURCE HI 100 litte Luci R SENSE HI Svr S 2 on 0419 op O 9 wags 1000 OI YEL _ WHT BLU ana in i x4 y PULA z re OC PR T i f Ah y _ m S aa do di XQ Ol J DANS 2 5 5 5 G NA M554 x 8 M 0417 0416 Sw ms RED BLK YEL lt 5 T anh GRY Gt o gt NOTE FOR COMPONENT INFORMATION SEE PRODUCT STRUCTURE MODEL NEXT ASSEMBLY USED ON zia SES 244 5 ER Kate DATE 2423790 SCALE 3x2 xD 511 C401 C402 2 WT ZE EV DIM ARE IN IN UNLESS OTHERWISE NOTED C LAYOUT DR KEITHLE c M DIM TOL ES SPECIFIED 75S CAB PRE IRN KEITHLEY INSIRUMENTS INC NC CLEVELAND DO NOT ket em 243 2 2 PG 1 OF 2 cuf Re d
66. of nominal resistance values shown Use actual values for tests Maximum uncertainty of alternate test equipment shown in parentheses Required for verification of current range Characterize resistor to 300ppm or better using recommended DMM before verifying 3A current measurement range 1 4 Performance Verification 10 resistor characterization The recommended 10 resistor should be characterized to 300ppm or better before verifying the 3A current measurement range You need not characterize the resistor if you are checking only the current source range Use the 4 wire ohms function of the DMM recommended in Table 1 1 to measure the resistance value and then use that measured value to calculate the cur rent during the 3A current measurement range test procedure The verification limits stated in this section have been calculated using only the Model 2420 one year accuracy specifications and they do not include test equipment uncertainty If a par ticular measurement falls outside the allowable range recalculate new limits based on Model 2420 specifications and corresponding test equipment specifications Example limits calculation As an example of how verification limits are calculated assume you are testing the 20V DC output range using a 20V output value Using the Model 2420 20V range one year accuracy specification of 0 02 of output 2 4mV offset the calculated output limits are Output limits 20V
67. on self teSt ii 4 2 Front panel tests ue beste ae 4 3 KEYS testa iaia palle ce e e ie 4 3 DISPLAY PATTERNS test i 4 3 CHAR SET testina lai lol Aa ee ERE as 4 4 Principles of operation ie 4 4 Overall block diagram i 4 4 Analog Circuits oer tet nai 4 4 Power supply sananpa e 4 6 Output 4 7 AID Converter iei eee he es RLS eee Lents 4 8 Active guard 3 nn eno brano Oc edd alia 4 8 Digital ete etre fee Re e prenne 4 8 Display board circuit 4 0 Troubleshooting e e pef RARA 4 10 Display board checks 4 10 Power supply checks siero 4 11 Digital circuitry checks ie 4 11 Analog circuitry checks eese 4 12 Battery replacement etri teen ug 4 12 Battery replacement precautions eere 4 12 Battery replacement 1 2 4 13 No comm link error 4 13 5 Disassembly Introductions a A ttes 5 2 Handling and cleaning esee 5 2 Handling PC DO ards oe temere 5 2 Soldet repalts eoe eee e ere rr 5 2 Static sensitive devices Ree eee pru etie 5 3 Assembly drawings 2 2 5 3 Case COVER TemoVAal i nie eet eert
68. open loop gain and slew rate control to the system to assure accura cy and provide a controllable signal for the output stage which provides the necessary voltage and current gain to drive the output Sense resistors in the HI output lead provide output current sensing and a separate sense resistor is used for each current range The 1A and 3A ranges use 0 2V full scale for a full range output while all other ranges use 2V output for full scale current Voltage feedback is routed either internally or externally There are four voltage ranges 0 2V 2V 20V and 60V The feedback gain changes only for the 20V and 60V ranges resulting in three unique feedback gain values A multiplexer directs the voltage feedback current feedback reference or ground signal to the A D converter An opto isolated interface provides control signals for both DACs analog circuit control and A D converter communication to the digital section Power supply Figure 4 3 Power supply block diagram Figure 4 3 shows a block diagram of the Model 2420 power delivery system Analog Board Output Stage 15V 15V 85V 42V 47 42V 485V Constant Frequency Low Noise Floating Switching Supply r 24Vdc Line 24dc 412Vdc Digita DC DC DC ge Neural prc Converter Regulators 7 Circuits JE Fvat Troubleshooting 4 7
69. pA 2430 2440 2420 2425 3 00000 150 uA 0 05996 2 7 mA 150 uA 2430 3 00000 2 500 pA 0 059 2 8 mA 300 pA 10 00000 2440 5 00000 A 50 pA 0 10 5 4 mA 500 pA TEMPERATURE COEFFICIENT 0 18 amp 28 50 C 0 15 x accuracy specification MAX OUTPUT POWER 22W 66W for Model 2420 110W for Model 2425 and 2430 55W for Model 2440 four quadrant source or sink operation SOURCE SINK LIMITS Model 2400 1 05A 21V 105 mA 210V Model 2410 1 05 21V 21 mA 1100V Model 2420 3 15 21V 1 05A 63V Model 2425 3 15A 21V 1 05A 105V Model 2430 1 05A 105V 10 5A 105V pulse mode only Model 2440 5 25A 10 5V 1 05A 42V CURRENT REGULATION Line 0 01 of range Load 0 01 of range except Model 2440 5A range 0 05 100pA VOLTAGE LIMIT Bipolar voltage limit compliance set with single value Min 0 1 of range OVERSHOOT 0 196 typical 1mA step RL 10kQ 20V range for Model 2400 2410 2420 2425 2430 10V range for Model 2440 ADDITIONAL SOURCE SPECIFICATIONS TRANSIENT RESPONSE TIME 301 minimum for the output to recover to its spec following a step change in load COMMAND PROCESSING TIME Maximum time required for the output to begin to change following the receipt of SOURce VOLTagelCURRent nrf command Autorange On 10ms Autorange Off 7ms OUTPUT SETTLING TIME Time required to reach 0 196 of final value after command is process
70. sending ESE 1 This command sets the OPC operation complete bit in the standard event enable register allowing operation complete status from the standard event status register to set the ESB event summary bit in the status byte when operation complete is detected Send the OPC command immediately following each calibration command For example CAL PRO T SEN S 2 0 PC Note that you must include the semicolon to separate the two commands and that the OPC command must appear on the same line as the command After sending a calibration command repeatedly test the ESB Event Summary bit bit 5 in the status byte until it is set Use STB to request the status byte Once operation complete has been detected clear OPC status using one of two methods 1 use ESR query then read the response to clear the standard event status register or 2 send the CLS command to clear the status registers Note that sending CLS will also clear the error queue and operation complete status Command Reference B 11 Generating an SRQ on calibration complete An IEEE 488 bus SRQ service request can be used to detect operation complete instead of repeatedly polling the Model 2420 To use this method send both ESE 1 and SRE 32 to the instrument then include the OPC command at the end of each calibration command line as covered above Clear the SRQ by querying the ESR using the ESR query to clear OPC sta tus then request
71. source protection to NONE To do so press CONFIG then SOURCE V to access the CONFIGURE V SOURCE menu Select PROTECTION and set the volt age source protection limit to NONE 4 Press the Model 2420 SOURCE V key to source voltage and make sure the source out put is turned on 5 Verify output voltage accuracy for each of the voltages listed in Table 1 3 For each test point Select the correct source range Set the Model 2420 output voltage to the indicated value Verify that the multimeter reading is within the limits given in the table 6 Repeat the procedure for negative output voltages with the same magnitudes as those listed in Table 1 3 7 Repeat the entire procedure using the rear panel INPUT OUTPUT jacks Be sure to select the rear panel jacks with the front panel TERMINALS key 1 10 Performance Verification Table 1 3 Output voltage accuracy limits Model 2420 Model 2420 output Output voltage limits source range voltage setting 1 year 18 28 200mV 200 000mV 199 360 to 200 640mV 2V 2 00000V 1 99900 to 2 00100V 20V 20 0000V 19 9936 to 20 0064V 60V 60 0000V 59 9808 to 60 0192V Voltage measurement accuracy Follow the steps below to verify that Model 2420 voltage measurement accuracy is within specified limits The test involves setting the source voltage to full range values as measured by a precision digital multimeter and then verifying that the Model 2420 voltage readings are with
72. the Model 2420 and the digital multimeter and allow them to warm up for at least one hour before performing calibration 2 8 Calibration 2 Press the MENU key then choose CAL and press ENTER Select UNLOCK and then press ENTER The instrument will display the following PASSWORD Use lt q gt A Y ENTER or EXIT 3 Use the up and down range keys to select the letter or number and use the left and right arrow keys to choose the position Enter the present password on the display Front panel default 002420 Press ENTER to complete the process 4 Press EXIT to return to normal display Instrument operating states will be set as sum marized in Table 2 2 Step 2 Voltage calibration Perform the steps below for each voltage range using Table 2 3 as a guide 1 Connect the Model 2420 to the digital multimeter as shown in Figure 2 1 Select the multimeter DC volts measurement function NOTE The 2 wire connections shown assume that remote sensing is not used Remote sensing may be used if desired but it is not essential when using the recommend ed digital multimeter Figure 2 1 Voltage calibration test connections Model 2420 Input HI Input LO I CIC Cool 161 Lir 161 Digital Multimeter 2 From normal display press the SOURCE V key 3 Press the EDIT key to select the source field cursor flashing in source displa
73. to display the following menu FRONT PANEL TESTS KEYS DISPLAY PATTERNS CHAR SET 4 Select KEYS and press ENTER to start the test When a key is pressed the label name for that key will be displayed to indicate that it is functioning properly When the key is released the message keys pressed is displayed 5 Pressing EXIT tests the EXIT key However the second consecutive press of EXIT aborts the test and returns the instrument to the SELF TEST MENU Continue pressing EXIT to back out of the menu structure DISPLAY PATTERNS test The display test lets you verify that each pixel and annunciator in the vacuum fluorescent dis play is working properly Perform the following steps to run the display test 1 Display the MAIN MENU by pressing the MENU key Select TEST and press ENTER to display the SELF TEST MENU Select DISPLAY TESTS and press ENTER to display the following menu FRONT PANEL TESTS KEYS DISPLAY PATTERNS CHAR SET Select DISPLAY PATTERNS and press ENTER to start the display test There are five parts to the display test Each time a front panel key except EXIT is pressed the next part of the test sequence is selected The five parts of the test sequence are as follows Checkerboard pattern alternate pixels on and all annunciators Checkerboard pattern and the annunciators that are on during normal operation Horizontal lines pixels of the first digit are sequenced Vertical lines pixels
74. zero negative full scale positive full scale 0 002 to 0 002 0 18 to 0 22 0 18 to 40 22 0 02 to 40 02 1 8 to 2 2 1 8 to 2 2 0 2 to 0 2 18 to 22 18 to 22 0 5 to 0 5 50 to 65 50 to 65 1E 7 to 1E 7 9E 6 to 11E 6 9E 6 to 1 1E 6 1E 6 to 1E 6 90 6 to 110E 6 90E 6 to 110E 6 1E 5 to 1E 5 0 9E 3 to 1 1E 3 0 9E 3 to 1 1E 3 1E 4 to 1E 4 9E 3 to 11E 3 9E 3 to 11E 3 1E 3 to 1E 3 90 3 to 110E 3 490E 3 to 110E 3 1E 2 to 1E 2 0 9 to 1 1 0 9 to 1 1 3E 2 to 3E 2 2 7 to 3 15 2 7 to 3 15 Note Actual allowable parameter ranges are 50 of full range for zero parameters 75 of full scale to 150 of full scale for full range parameters but ranges listed above should be observed for optimum calibration SO URCE CALibration PRO Tected SO U Rce Purpose Format Parameters Description Note To calibrate the source function cal prot sour lt nrf gt See Table B 3 for recommended parameter ranges The CAL PROT SOUR command calibrates the Model 2420 source func tion To use this command you must 1 program the source to the correct value 2 select the range being calibrated and 3 send the CAL PROT SOUR command for each parameter listed in Table B 3 When the Model 2420 receives this command it will attempt to place the pa rameter into one of the four parameter ranges summarized in Table B 3 de pending on the active SOUR FUNC and range If the param
75. 0 SENS CURR NPLC 1 0 Sense Current Range Source I SENS CURR RANG source I range Filter Count 10 SENS AVER COUN 10 Filter Control REPEAT SENS AVER TCON REPeat Filter Averaging ON SENS AVER STAT ON Source V Mode FIXED SOUR VOLT MODE FIXED Volts Autorange OFF SOUR VOLT RANG AUTO OFF Source I Mode FIXED SOUR CURR MODE FIXED Current Autorange OFF SOUR CURR RANG AUTO OFF Autozero ON SYST AZERO ON Trigger Arm Count 1 ARM COUNT 1 Trigger Arm Source Immediate ARM SOUR IMMediate Trigger Count 1 TRIG COUNT 1 Trigger Source Immediate TRIG SOUR IMMediate Unlocking calibration by remote To unlock calibration via remote send the following command CAL PROT CO DE lt password gt For example the following command uses the default password CAL PRO T CO DE K1002420 2 6 Calibration Changing the password The default password may be changed from the front panel or via remote as discussed below Changing the password from the front panel Follow the steps below to change the password from the front panel 1 Press the MENU key then choose CAL and press ENTER The instrument will display the following CALIBRATION UNLOCK EXECUTE VIEW DATES p gt lt SAVE LO CK CHANGE PASSWO RD 2 Select UNLOCK then enter the password Default 002420 3 Select CHANGE PASSWORD and then press ENTER The instrument will display the following New Pwd 002420 Use 4 Y ENTER or EXIT 4 Using the range keys
76. 0 1 Current limit when voltage source is active SENS CURR RANG 0 1 Make sure 1A range is not active SOUR VOLT PROT MAX Maximum allowable source voltage SYST RSEN OFF Disable remote sensing CAL PROT CODE KI002420 Unlock cal OUTP STAT ON Turn source on Remote sensing may be used if desired but is not essential when using the recommended digital multimeter To use remote sensing send SYST RSEN ON Calibration 2 19 Table 2 9 Voltage range calibration commands Step Command procedure Description 1 SOUR VOLT RANGE Range Select source range 2 SOUR VOLT Source value Establish negative full range polarity 3 Take DMM reading Read actual output value 4 CAL PROT SOUR DMM Reading Calibrate sense function negative full scale 5 Check 2420 for errors 6 CAL PROT SENS DMM Reading Calibrate source function negative full scale 7 Check 2420 for errors 8 SOUR VOLT 0 0 Set output to OV 9 Take DMM reading Read actual output value 10 CAL PROT SOUR DMM Reading Calibrate sense function negative zero 11 Check 2420 for errors 12 CAL PROT SENS DMM Reading Calibration source function negative zero 13 Check 2420 for errors 14 SOUR VOLT lt value Establish positive full range polarity 15 DMM reading Read actual output value 16 CAL PROT SOUR DMM Reading Calibrate sense function positive full scale 17 Check 2420 for errors
77. 04 606 RES 499 1 1000MW THICK FILM R 418 499 RES 1 100MW THICK FILM R 418 1K R341 342 505 RES 13K 1 100MW THICK FILM 418 13 R354 437 RES 560K 596 250MW METAL FILM R 376 560K R363 RES NET 1 1W TF 259 R364 370 371 372 402 403 404 416 RES 100K 1 100MW THICK FILM 418 100 417 459 R367 424 425 426 601 603 605 608 6 RES 4 99K 1 100MW THICK FILM R 418 4 99K 26 702 R368 RES 332 1 100MW THICK FILM R 418 332 R375 376 RES 10 10 1OOMW THICK FILM R 418 10 R379 387 391 392 RES 475 1 100MW THICK FILM R 418 475 R393 399 411 412 413 388 307 RES 357 1 100MW THICK FILM R 418 357 R422 RES 4 7K 5 250MW METAL FILM R 376 4 7K R435 436 RES 499 1 1000MW THICK FILM R 418 499 R450 RES 200K 1 1 10W METAL FILM R 263 200K R452 RES 21 93K 1 1 10W METAL FILM R 263 21 93K R453 RES 1 82K 1 1 10W METAL FILM R 263 1 82K 6 7 6 8 Replaceable Parts Table 6 1 cont Analog board parts list Circuit designation Description R454 455 469 470 47 1 467 468 RES 100 1 1 10W METAL FILM R 263 100 R463 479 473 RES 30 1K 1 100MW THICK FILM R 418 30 1K R472 478 466 355 290 344 309 RES 1 100MW THICK FILM R 418 1K R474 RESISTOR R 473 2 R482 484 487 RES 6 04K 1 1000MW THICK FILM R 418 6 04K R483 RES 2K 1 100MW THICK FILM R 418 2K R488 562 600 RES 100K 1 100MW THICK FILM R 418 100K R489 356 359 418 RES 1 1OOMW THICK FIL
78. 07 T Lo lt I rie o S Si cc NE ata 7 C I B C D E F A 071 00 2 on 20811 CHG D ARTWORK FROM REV A TO C MOVED DISPLAY 20MILS INWARD ADDED C917 J1034 FE 27 2 PLACES DS901 DISPLAY IS 12 MOUNTED ON SIDE 01 1 TAP MOUNTED BETWEEN 0590 SEE DETAIL A e PLACES 00000000000 2 MC 612 SIDE 02 ONLY 00000000000 0000000000 00000007 en eS 00000000000 0000000 0901 00000007 090 00000000000 1 9 000000004 902 0000000000 R DI
79. 20V x 0 02 2 4 Output limits 20V 0 004 0 0024 Output limits 20V 0 0064V Output limits 19 9936V to 20 0064V Resistance limits calculation When verifying the resistance measurement accuracy it will probably be necessary to recal culate resistance limits based on the actual calibrator resistance values You can calculate resis tance reading limits in the same manner described above but be sure to use the actual calibrator resistance values and the Model 2420 normal accuracy specifications for your calculations As an example assume you are testing the 20kQ range and that the actual value of the nom inal 19kQ calibrator resistor is 19 01kO Using the Model 2420 20 range one year normal accuracy specifications of 0 063 of reading 30 the recalculated reading limits are Reading limits 19 01kQ 19 01kQ x 0 063 30 Reading limits 19 01kQ 15Q Reading limits 18 9950k to 19 0250kQ Performance Verification 1 5 Restoring factory defaults Before performing the verification procedures restore the instrument to its factory front panel bench defaults as follows 1 Press the MENU key The instrument will display the following prompt MAIN MENU SAVESETUP COMMUNICATION CAL 2 Select SAVESETUP and then press ENTER The unit then displays SAVESETU P M ENU GLOBAL SOURCE M EM O RY 3 Select GLOBAL and then press ENTER The unit then displays GLO BAL SETU P M ENU SAVE RESTORE POWERON R
80. 430 and 2440 with similar accuracy enhancement 10A range only in pulse mode n pulse mode limited to 0 1 PLC measurement 8 Except 2440 default test current is 5pA 9 Except 2440 default test current is 0 5pA Rev 5 17 01 2400 2400 C 2410 2410 C 2420 2420 C 2425 2425 C 2430 2430 C 2440 2440 C SourceMeter Line Specifications SYSTEM SPEEDS MEASUREMENT MAXIMUM RANGE CHANGE RATE 75 second MAXIMUM MEASURE AUTORANGE TIME 40ms fixed source SWEEP OPERATION READING RATES rdg second for 60Hz 50Hz SOURCE MEASURE MEASURE SOURCE MEASURE PASS FAIL TEST 5 SOURCE MEMORY SPEED NPLC TRIGGER ORIGIN TO MEM TO GPIB TO MEM TO GPIB TO MEM TO GPIB MEM TO GPIB Fast 0 01 internal 2081 2030 1754 1551 1515 1369 902 900 981 165 162 165 IEEE 488 1 Mode 0 01 external 1239 1200 1254 1018 990 1035 830 830 886 163 160 163 Fast 0 01 internal 2081 2030 1198 1210 1551 1515 1000 900 902 900 809 840 165 162 164 162 IEEE 488 2 Mode 0 01 external 1239 1200 1079 1050 1018 990 916 835 830 830 756 780 163 160 162 160 Medium 0 10 internal 510 433 509 433 470 405 470 410 389 343 388 343 133 126 132 126 IEEE 488 2 Mode 0 10 external 438 380 438 380 409 360 409 365 374 333 374 333 131 125 131 125 Normal 1 00 internal 59 49 59 49 58 48 58 48 56 47 56 47 44 38 44 38 IEEE 488 2 Mode 1 00 external 57 48 57 48
81. 475 1 100MW THICK FILM R 418 475 R6 47 RES 10K 1 100MW THICK FILM R 418 10K R65 RES 2 21K 1 100MW THICK FILM R 418 2 21K Replaceable Parts Table 6 2 cont Digital board parts list Circuit designation Description i R66 RESISTOR METAL FILM R 464 100K R67 RES 8 06K 1 1W THICK FILM 418 8 06 R73 74 76 78 81 83 7 60 69 71 85 89 5 10K 1 100 THICK FILM R 418 10K R77 RES 15k 1 1OOMW THICK FILM R 418 15K R82 RES 499 1 1000MW THICK FILM R 418 499 R84 109 110 38 RES 10K 1 100MW THICK FILM R 418 10K R9 11 12 16 20 RES 100 5 250MW METAL FILM R 376 100 R90 RESISTOR THICK FILM R 418 1 07K R93 RES 6 81K 1 125W THIN FILM R 456 6 81K R94 RESISTOR CERAMIC R 463 1 R97 100 RES 200 1 100MW THICK FILM R 418 200 R99 107 RES 150K 1 100MW THICK FILM R 418 150K RT101 INRUSH CURRENT LIMITER RT 23 VARISTOR VR 10 101 METAL OXIDE VARISTOR VR 7 501 2 SOCKET PLCC 032 T A SO 143 32 51 SWITCH PUSHBUTTON 6 POLE SW 466 TRANSFORMER TR 313A T2 TRANSFORMER TR 312A T3 TRANSFORMER TR 317A TP1 12 14 18 CONN TEST POINT CS 553 U10 LARGE SCALE IC SMT IC 980 011 VOLT COMPARATOR LM393D IC 775 U12 14 LARGE SCALE IC LSI 162 70 U13 IC GPIB ADAPTER 9914A LSI 123 U15 PROGRAMMED ROM 2400 803 U16 PROGRAM 2400 804 U17 IC SERIAL EPROM 24LC16B LSI 153 U18 IC REGULATOR SWITCHING IC 1080 78ST105SC U19 IC SCHMITT TRIGGER NAND GATE IC 950 6 15
82. 7 C541 deos CS o sZ C514 62940 9 R421 C328 R318 R310 RO C262 O O 3 O _ C512 R516 R295 Q R364 8122 a R155 EEG R296 R23 n R154 C271 R121 O R558 5 C307 R124 R123 R293 R129 R365 ND 302 R236 H n O R552 aod RI R354 gt a A HH O 4 C236 R237 R350 2 R118 R117 e 25 es R152 R301 R352 20268 C281 R345 O A 2 EN ES C228 R436 CN Q R403 C283 m V LI R288 N r3 EM c R369 uw t R553 cele 5 o s R592 D O R368 R336 V N pA R433 NC 5 2 R687 N a aU Q C 2 mm 4 5 R276 ES a 5 C334 R722 O N C231 8 Bj S E AEN 1694 R423 S O e R268 5224 2 R270 E 7 or R372 R269 12 C232 R271 R358 R402 O R272 8371 O B S o N J uw TA ES E R566 1273 i R370 a m 9 C211 x y NI O O a R259 R264 _ o Zaj _ R564 pe e dd E d R267 R367 R366 E 00 EH gt tal T N to R517 gt 257 R266 E x gt R563 R254 R258 Ha La gt O O r R524 R241 2 C281 O O Ses R565 R562 R240 8242 C282 R348 R512 Fogo sa ra I R347 3 ET 8567 R511 R250 R248 R314 O O I R521 R505 R141 R251 R249 R317 us g O R529 R589 sake a R424 nase C207 C248 R425 m R21 x vn
83. 8 PULSE BOARD ASSEMBLY 4 40X1 4PPH PHIL PAN HEAD SCREW KEITHLEY Gr rier Inc XXX 2 005 FRAC gt 21 64 MATERIAL NO SURFACE MAX 3 FINISH 6 Replaceable Parts 6 2 Replaceable Parts Introduction This section contains replacement parts information and component layout drawings for the Model 2420 Parts lists The electrical parts lists for the Model 2420 are shown tables at the end of this section For part numbers to the various mechanical parts and assemblies use the Miscellaneous parts list and the assembly drawings provided at the end of Section 5 O rdering information To place an order or to obtain information concerning replacement parts contact your Kei thley representative or the factory see inside front cover for addresses When ordering parts be sure to include the following information Instrument model number Model 2420 Instrument serial number Part description Component designation if applicable Keithley part number Factory service If the instrument is to be returned to Keithley Instruments for repair perform the following Call the Repair Department at 1 800 552 1115 for a Return Material Authorization RMA number Complete the service form at the back of this manual and include it with the instrument Carefully pack the instrument in the original packing carton Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label
84. 9 TG 266 Q405 410 411 602 605 223 420 502 TRANS N MOSFET VN0605T TG 243 Q412 414 TRANS N MEGAFET RFD 14NOSLSM TG 267 Q415 416 TRANS P FET 23 06 TG 229 Q417 419 N CHANNEL MEGAFET TG 339 0418 TRANS P CHAN MOSFET 0610 TG 259 Q500 503 TRANSISTOR SMT TG 350 Q501 510 534 535 528 227 257 515 TRANS NPN MMBT3904 TG 238 517 519 Q504 514 516 TRANSISTOR TG 349 Q507 523 525 TRANSISTOR TG 348 Q518 TRANSISTOR TG 356 6 5 6 6 Replaceable Parts Table 6 1 cont Analog board parts list Circuit designation Description Pun Q521 TRANSISTOR TG 357 Q522 524 600 TRANS NPN MMBT3904 TG 238 0526 527 530 531 TRANS CHANNEL TG 302 SI9410DY Q532 TRANS N CHANNEL FET IRF630 TG 214 Q533 TRANS P CHANNEL 200V FET IRF9630 TG 215 R117 128 133 136 141 144 RES 10K 596 250MW METAL FILM R 376 10K R129 211 224 RES 10K 1 100MW THICK FILM R 418 10K 229 234237 244 247 281 282 R137 140 145 149 RES 10K 5 250MW METAL FILM R 376 10K R150 151 389 390 431 432 433 434 5 RES 1 100MW THICK FILM R 418 1K 20 536 R152 291 293 RES 42 7K 1 125W THIN FILM R 456 42 7K R155 669 RES 10K 1 100MW THICK FILM R 418 10K R200 201 203 232 238 RESISTOR NETWORK 10K 10K TF 236 R202 204 252 255 256 259 260 263 RES 100K 1 100MW THICK FILM R 418 100K 264 267 R205 310 485 552 667 RES 0499 1 100MW THICK FILM R 418 0499 R207 RES 20K 1 125W THIN FILM R 456 20K R210
85. 90 to 250V and a line frequency of 50 to 60Hz Verification tests must be performed within this range 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 test equipment uncertainty will add to the uncertainty of each measurement Generally test equipment uncertainty should be at least four times better than corresponding Model 2420 specifications Table 1 1 lists the specifications of the recommended test equipment includ ing maximum allowable uncertainty for alternate test equipment which is shown in parentheses Table 1 1 Recommended verification equipment Description Manufacturer Model Specifications Digital Multimeter Hewlett Packard DC Voltage 1V 5 6ppm HP3458A 10V 4 3ppm 100V 6 3ppm DC Current 10uA 25ppm 100 23ppm ImA 20ppm 10mA 20ppm 100mA 35ppm 1A 110ppm Resistance Calibrator Fluke 5450A Resistance 1 90 65ppm 460ppm 190 23ppm 280ppm 190Q 10 5ppm 230ppm 1 9kQ 8ppm 200ppm 19kQ 7 5 195ppm 190kQ 8 5 200ppm 1 9MQ 11 5ppm 180ppm 19MQ 30ppm 635ppm Precision Resistor Isotec RUG Z 1R00 0 1 1Q 0 1 100W 90 day full range accuracy specifications of ranges required for various measurement points 90 day 5 C specifications
86. A SWITCH SPST IC 909 MAX326CSE U239 IC QUAD 2 INPUT NAND 74HC00M IC 781 U240 IC POS NAND GATES INVERT 74HCT14 IC 656 U242 247 IC DUAL HIGH CMR SPEED IC 588 OPTO HCPL 263 1 U252 256 IC 8 STAGE SHIFT CD74HC4094M IC 1026 U257 IC SUPPLY VOLT SUPERVISOR IC 860 TL7705A U410 218 216 225 ICM DUAL J FET OP AMP OP 282GS IC 968 0500 OP AMP AD847JN IC 890 U501 506 IC VOLT COMPARATOR LM393D IC 775 U503 5 VOLTAGE REGULATOR IC 576 LM2940CT U504 IC POS VOLTAGE IC 194 REG 15V 500MA 78M15 U505 IC NEG VOLTAGE REG 15V IC 195 500MA 79M15 U600 264 206 207 208 233 IC DUAL PICOAMP OP AMP AD706JR IC 910 U601 IC QUAD D FLIP W CLK RESET 923 74 175 0604 IC NCHAN LAT DMOS QUAD IC 893 FET SD5400CY U605 INTEGRATED CIRCUIT OPA17 IC 960 U606 236 IC HI SPEED BIFET OP AMP AD711JR 894 U607 IC OP AMP NE5534D IC 802 U608 IC VOLT COMPARATOR LM311M IC 776 U609 PROGRAMMED IC 2400 801 U651 602 603 224 IC QUAD 2 IN NOR 74HCTO2 IC 809 U660 661 IC 16 BIT DAC AD7849BR IC 1004 VR200 201 DIODE ZENER MM524694 TI DZ 113 Table 6 1 cont Analog board parts list Replaceable Parts Circuit designation Description VR202 203 407 409 506 507 DIODE ZENER 5 1V BZX84C5V1 DZ 88 VR214 215 DIODE ZENER 8 2V MMBZ5237 DZ 92 VR400 401 DIODE ZENER 4 7V IN4732A DZ 67 VR410 601 604 DIODE ZENER 3 3V MMBZ5226BL DZ 94 VR500 501 DIODE ZENER 6 0V BZX84B6V2 DZ 87 VR502 503 DIODE ZENE
87. AMIC C 451 220P C331 334 CAP 100PF 5 100V CERAMIC C 465 100P C400 401 296 330 CAP 270PF 2 5 630V POLYPROPYLENE C 405 270P C409 410 CAP 15UF 20 50V CERAMIC C 418 15 C412 CAP 1UF 20 35V TANTALUM C 494 1 C501 503 CAP 47UF 2096 100V ALUM ELEC C 521 47 C502 504 506 550 553 01U 10 500V CERAMIC C 497 01 C512 514 CAP 22PF 1096 100V CERAMIC C 451 22P 6 3 6 4 Replaceable Parts Table 6 1 cont Analog board parts list ROW Circuit designation Description La C513 CAP 560PF 2 5 630V POLY PROPYLENE C 405 560P C515 541 CAP 1UF 2096 50V CERAMIC C 418 1 522 523 526 527 3300P 10 500V CERAMIC C 497 3300P C528 533 CAP 3300P 1096 500V CERAMIC C 497 3300P C534 535 CAP 470UF 2096 63V ALUM ELEC 477 470 537 540 CAP 1UF 20 100V CERAMIC C 436 1 C542 548 549 561 564 CAP 1UF 1096 25V CERAMIC C 495 1 C543 CAP 10PF 10 1000V CERAMIC C 64 10P C544 547 CAP 01U 10 500V CERAMIC C 497 01 558 565 566 600 602 605 CAP 1UF 10 25 CERAMIC C 495 1 607 613 614 617 C610 612 2200P 10 100V CERAMIC C 430 2200P C616 556 557 559 560 562 563 22UF 20 25V TANTALUM C 440 22 C618 625 650 652 659 662 262 263 CAP 1UF 10 25 CERAMIC C 495 1 CR200 203 205 207 208 210 216 DIODE SWITCHING MMBD914 RF 83 221 235 CR206 209 230 233 400 401 222 223 DIODE IN3595 RF 43 CR224 225 517 519 SCHOTTKY BARRIER RECTIFIER RF 119 236
88. ANTABILITY 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 RG7 4AB 0118 929 7500 Fax 0118 929 7519 INDIA Flat 2B Willocrissa 14 Rest House Crescent Bangalore 560 001 91 80 509 1320
89. APACITOR 527 5000 55 15 21 29 37 01 5 50 514 01 57 58 38 1000PF 10 50V MONO CERAMIC 452 1000 62 91 CAP 10UF 20 25V TANTALUM C 440 10 C65 CAP 022UF 10 50V CERAMIC C 491 022 C72 86 CAP 1UF 20 50V CERAMIC C 519 1 Replaceable Parts Table 6 2 cont Digital board parts list Circuit designation Description C84 6 7 9 18 90 52 70 71 73 64 102 CAP 1UF 10 25V CERAMIC C 495 1 C94 CAP 470UF 20 100 16V ALUMINUM 313 470 C96 106 112 118 220 10 100 35 ELECTRO C 309 22 LYTIC C97 CAPACITOR POLYESTER 553 47 99 01uF 20 50V CERAMIC C 418 01 CR13 DIODE DUAL HSM 2822T31 RF 95 CR14 15 22 24 5 32 33 DIODE DUAL SWITCHING BAV99L RF 82 CR1 4 35 37 38 39 47 ULTRAFAST POWER RECTIFIER RF 107 CR36 43 44 45 46 DIODE ULTRAFAST MUR860 RF 68 CR48 49 DIODE SWITCHING MMBD914 RF 83 6 12 40 41 ULTRAFAST POWER RECTIFIER RF 105 CR8 11 17 21 25 28 31 19 DIODE SWITCHING 250MA BAV103 RF 89 CR9 RECTIFIER RF 120 Fl POLYSWITCH SMD030 2 FU 103 F2 FUSE 3A FU 107 1 HS1 2 HEAT SINK HS 38 J1002 CONN MOLEX 3 PIN CS 772 3 J1023 CONN RIGHT ANGLE 24PIN CS 507 J1024 CONN RT ANGLE MALE 9 PIN CS 761 9 J1025 CONN MICRODIN W GND FINGERS CS 792 J1026 CONN D SUB MALE BOARDLOCK CS 848 9 TYPE RELAY SURFACE MOUNT RL 188 L1 FERRITE CHIP 600 OHM BLM32A07 CH 62 L3 CHOKE CH 81 L4 5 6 7 CHOKE CH 89 1 LSI BEEPER 5V 30MA Q
90. AS I keys and make sure the source output is turned on 4 Verify measure current accuracy for the 10UA 1A range currents listed in Table 1 6 For each measurement Select the correct source range Setthe Model 2420 source output to the correct value as measured by the digital multimeter Verify that the Model 2420 current reading is within the limits given in the table NOTE lItmay not be possible to set the current source to the specified value Use the closest possible setting and modify reading limits accordingly 5 Repeat the procedure for negative calibrator currents with the same magnitudes as those listed in Table 1 6 6 Repeat the entire procedure using the rear panel INPUT OUTPUT jacks Be sure to select the rear panel jacks with the front panel TERMINALS key NOTE Test currents above 105mA cannot be maintained longer than 1 minute without affecting accuracy See derating information in Note 1 under Table 1 5 1 14 Performance Verification 3A range accuracy NOTE NOTE 5 6 The 10 resistor should be characterized to within 300 before verifying the current measurement range Use the 4 wire ohms function of the DMM to measure the resistance value and then use that measured value to calculate the current during the measurement procedure With the power off connect the 10 resistor and digital multimeter to the Model 2420 INPUT OUTPUT jacks as shown in Figure 1 3 Select the multimeter DC vol
91. AT SIDE 2001 371A P C BOARD STOP 2 REQ D 3 PLACE ON FRONT PANEL TABS AND SLIDE E RT TOWARDS OUTSIDE EDGE OF PANEL 2400 1100 DISPLAY BOARD ASSEMBLY 2 SNAP TOP OF BOARD INTO FRONT PANEL 27 6511 3098 LENS LED t Q 2430 313B OVERLAY BERG PIN MEMBRANE SWITCH GBENTN S REF PIN 1 2400 315A CONDUCTIVE RUBBER SWITCH FRONT PANEL REF 2430 311B DISPLAY LENS DO NOT REMOVE GREEN MASK FROM LENS PART NUMBER QTY DESCRIPTION 2400 305 STAKING FRONT PANEL REF 2400 306B ANA 2400 1100 DISPLAY BOARD ASSEMBLY 2430 2430 052 d 2430 3138 OVERLAY MEMBRANE SWITCH Q MODEL NEXT ASSEMBLY NEXT PROCESS STEP QTY 2430 3118 DISPLAY LENS USED ON SUITEN DO NOT SCALE THIS DRAWING Wire ee ee ee ey s E 0 2 BOARD STOP 2 mm ENG FRONT PANEL ASSEMBLY OP6 6511 3098 LENS LED XX 015 ANG 1 DRN mat 15 63 FINISH H 2430 040 SURFACE MAX 53 t ST 166 17 STANDOFF 9 LTR ECA NO REVISION ENG DATE 090 052 4 IN LBS 4 40x1 4PPH ON AN 2 REQ D 5 IN LBS 25642 A
92. Component layouts The component layouts for the various circuit boards are provided on the following pages Drawings include Analog board 2430 100 Display board 2400 110 Digital board 2420 140 Replaceable Parts Table 6 1 Analog board parts list Circuit designation Description i C200 203 205 210 225 226 231 CAP 1UF 10 25V CERAMIC C 495 1 232 237 238 C204 411 608 609 CAP 01UF 10 50V CERAMIC C 491 01 C211 214 CAP 1000PF 10 50V MONO CERAMIC C 452 1000P C215 222 611 CAP 100PF 5 100V CERAMIC C 465 100P 2220702 239 240 5 100V CERAMIC 465 33 C241 CAP 1000PF 1 50V CERAMIC C 347 1000P C242 243 248 249 254 255 258 261 269 271 CAP 1UF 10 25 CERAMIC C 495 1 C246 336 CAP 3300PF 10 100V CERAMIC C 430 3300P C247 CAP 01 5 50V NPO C 514 01 C250 251 272 290 291 297 1UF 1096 25 CERAMIC C 495 1 300 524 525 C256 257 CAP 22PF 1096 100V CERAMIC C 451 22P 267 268 327 1000 10 100 451 1000 273 282 284 289 305 310 321 322 CAP 1UF 10 25V CERAMIC C 495 1 C283 100P 10 100V CERAMIC C 451 100P C301 302 CAP 1000PF 10 50V MONO CERAMIC C 452 1000P C311 CAP 100UF 20 10V ALUM ELEC C 483 100 C312 319 10 5 100 372 10 C323 326 603 604 615 CAP 47P 596 100V CERAMIC C 465 47P C328 CAP 33PF 10 100V CERAMIC C 451 33P C329 220PF 10 100V CER
93. EN PURPOSE BC868 TG 293 R901 RES NET 15K 2 1 875W TF 219 15K R902 RES 13K 5 125MW METAL FILM R 375 13K R903 904 RES 4 7 5 250MW METAL FILM R 376 4 7K R905 RES 5 125MW METAL FILM R 375 1M R906 RES 1K 5 250MW METAL FILM R 376 1K R907 RES 240 5 250MW METAL FILM R 376 240 R908 RES 10M 5 125MW METAL FILM R 375 10M T901 TRANSFORMER TDK ER14 5 SERIES TR 300 U901 904 905 IC LATCHED DRIVERS UCN 5812EPF 1 IC 732 U902 PROGRAMMED ROM 7001 800 U903 IC 32 BIT SERIAL UCN5818EPF IC 830 VR901 DIODE ZENER 8 2V MMBZ5237 DZ 92 Y901 CRYSTAL 4MHZ CR 36 4M Order same revision level as current part 6 17 6 18 Replaceable Parts Table 6 4 Mechanical parts list Description Keithley part no FAN FN 33 2 LINE FILTER LF 11 LUG LU 88 LED HIGH POWER PL 94 CHASSIS ASSEMBLY 2420 302A REAR PANEL 2400 303B CHASSIS 2420 301A BANANA JACK PUSH IN BLACK BJ 14 0 BANANA JACK PUSH IN RED BJ 14 2 BANANA JACK PUSH IN BLUE BJ 14 6 BANANA JACK PUSH IN WHITE _ BJ 14 9 HOLDER FERRITE 2001 367A PC BOARD STOP 2001 371A SWITCHPAD 2400 315A HEAT SINK 2420 308A BOTTOM SHIELD 2420 309A DISPLAY LENS 2420 311A COVER 2420 317A BEZEL REAR 428 303D FOOT 428 319A MOUNTING EAR RIGHT 428 328E HANDLE 428 329F MOUNTING EAR LEFT 428 338B LENS LED 6517 309A POWER ROD 704 313A CHOKE CH 58 1A FOOT EXTRUDED FE 22A FOOT RUBBER FE 6 FUSE FU 106 3 15
94. ESET 4 Select RESET and then press ENTER The unit displays RESET ORIGINAL DFLTS BENCH GPIB 5 Select BENCH and then press ENTER The unit then displays RESETTING INSTRUMENT ENTER to confirm EXIT to abort 6 Press ENTER to restore bench defaults and note the unit displays the following RESET COMPLETE BENCH defaults are now restored p lt Press ENTER to continue 7 Press ENTER then EXIT as necessary to return to normal display Performing the verification test procedures Test summary DC voltage output accuracy DC voltage measurement accuracy DC current output accuracy DC current measurement accuracy Resistance measurement accuracy If the Model 2420 is not within specifications and not under warranty see the calibration pro cedures in Section 2 for information on calibrating the unit 1 6 Performance Verification Test consderations When performing the verification procedures Be sure to restore factory front panel defaults as previously outlined Make sure that the test equipment is properly warmed up and connected to the Model 2420 INPUT OUTPUT jacks Also be sure that the front panel jacks are selected with the TERMINALS key Make sure the Model 2420 is set to the correct source range see below Be sure that the Model 2420 output is turned on before making measurements Be sure the test equipment is set up for the proper function and range Allow the Model 2420 output signal to settle b
95. GE PASSWO RD Select LOCK and then press ENTER The instrument will display the following message CALIBRATION LOCKED Press ENTER or EXIT to continue Press ENTER or EXIT to return to normal display Remote calibration Use the following procedure to perform remote calibration by sending SCPI commands over the IEEE 488 bus or RS 232 port The remote commands and appropriate parameters are sepa rately summarized for each step Calibration 2 15 Remote calibration commands Table 2 5 summarizes remote calibration commands For a more complete description of these commands refer to Appendix B Table 2 5 Remote calibration command summary Command Description CALibration Calibration subsystem PROTected Cal commands protected by password CODE lt password gt Unlock cal changes password if cal is already unlocked Default password KI002420 COUNT Query number of times 2420 has been calibrated SAVE Save calibration data to EEPROM LOCK Lock calibration inhibit SAVE command operation LOCK Request cal lock status DATE lt y gt lt m gt lt d gt Program calibration year month day DATE Query calibration year month day NDUE lt gt lt gt lt 4 gt Program calibration due year month day NDUE Query calibration due year month day SENSe lt nrf gt Calibrate active measure range See Table 2 6 parameters DATA Query measurement cal constants for active range SOURce
96. KEI I HLEY Model 2420 3A SourceMeter Service Manual A MEASUR ENMSILES ONFIDENCE WARRANTY Keithley Instruments Inc warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment Keithley Instruments Inc warrants the following items for 90 days from the date of shipment probes cables rechargeable batteries diskettes and documentation During the warranty period we will at our option either repair or replace any product that proves to be 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 OFWARRANTY 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 IMPLIED INCLUD ING ANY IMPLIED WARRANTY OF MERCH
97. M R 418 1K 421 456 458 460 462 R490 RES 205 1 1 10W METAL FILM R 263 205 R501 514 570 571 705 RES 249 196 100MW THICK FILM R 418 249 R503 563 RES 15k 1 100MW THICK FILM 418 15 506 507 RES 11K 5 250MW METAL FILM R 376 11K R508 509 RES 11K 5 250MW METAL FILM R 376 11K R516 523 RES 4 02K 1 100MW THICK FILM R 418 4 02K R517 524 564 565 566 567 RES 12 1 1 125MW METAL FILM R 391 12 1 R521 RES 2M 1 1OOMW THICK FILM R 418 2M R529 530 532 534 RES 249 196 100MW THICK FILM R 418 249 R537 451 531 RES 1 100MW THICK FILM R 418 1K R538 543 568 569 RES 5 5 1W METAL R 444 5 R545 RES 15k 1 100MW THICK FILM 418 15 548 304 306 RES 33 5 250mW METAL FILM R 376 33 R554 RES 2 21 1 100MW THICK FILM R 418 2 21K R559 RES 100 1 100MW THICK FILM R 418 100 R560 561 RES 45 3K 1 1000MW THICK FILM R 418 45 3K R602 607 RES 150 596 250MW METAL FILM R 376 150 R609 RES NET TF 245 R610 RES 1 28M 1 1 8W METAL FILM R 176 1 28M R611 621 RES 475 1 100MW THICK FILM R 418 475 R612 RES 5 11K 1 100MW THICK FILM R 418 5 11K R613 624 659 660 558 RES 100 1 100MW THICK FILM R 418 100 Table 6 1 cont Analog board parts list Replaceable Parts Circuit designation Description R614 615 553 RES 2 21K 1 100MW THICK FILM R 418 2 21K R618 RES 1 100MW THICK FILM R 418 34K R619 RES 4 75K 1 100MW THICK FILM 418 4 75 R620 RES 82 5 1
98. MX 05 EM 6 P1027 1033 CABLE ASSEMBLY CA 62 4B P1028 CABLE ASSEMBLY CA 32 9B 6 13 6 14 Replaceable Parts Table 6 2 cont Digital board parts list Circuit designation Description 1035 LATCHING HEADER FRICTON SGL CS 724 3 ROW PSI POWER SUPPLY PS 54 2A Q1 3 4 5 6 TRANS N MOSFET VN0605T TG 243 Q10 TRANS NPN MMBT3904 TG 238 Q2 TRANSISTOR TG 338 Q7 12 8 POWER MOSFET IRFZ346 TG 313 Q9 TRANS TRIODE THYRIS TG 172 TOR MAC223A6 R1 37 43 44 45 RES 2 21K 1 100MW THICK FILM R 418 2 21K R10 RES 332 1 100MW THICK FILM R 418 332K R101 RES 20K 1 1OOMW THICK FILM R 418 20K R102 RES 100K 1 100MW THICK FILM R 418 100K R103 105 RES 1 1OOMW THICK FILM R 418 1K R108 51 RES 249K 1 1OOMW THICK FILM R 418 249K R15 17 21 23 31 70 72 18 48 61 8 155 RES 1 100MW THICK FILM R 418 1K R2 13 4 52 14 19 34 35 50 58 63 68 RES 10K 1 100MW THICK FILM R 418 10K 62 75 R22 RES 4 02K 1 100MW THICK FILM R 418 4 02K R25 28 49 RES 4 75K 1 100MW THICK FILM R 418 4 75K R30 RES 100 1 100MW THICK FILM R 418 100 R33 39 92 95 29 36 42 RES 0499 1 1OOMW THICK FILM R 418 0499 R40 32 27 24 RES 5 1K 5 125MW METAL FILM R 375 5 1K R41 56 96 98 RESISTOR METAL FILM R 465 499K R46 RES 10 10 100MW THICK FILM R 418 10 RS RES 10M 1 125MW THICK FILM R 418 10M R55 RES 10M 1 125MW THICK FILM R 418 10M R57 RES 1 1OOMW THICK FILM R 418 1M R59 RES
99. N 0 as TR cu 3 REVISION ENG DATE ON 3 FROM 01 TO CHG D REV FROM GI TO H REVISED ARTWORK SEE PAGE 1 ELS MR REMOVED x FRO
100. OUR CAL PROT SENS DATA SOUR CURR CAL PROT SOUR CAL PROT SENS DATA SOUR CURR 0 0 CAL PROT SOUR Requesting calibration constants Calibration Programs C 7 Program C 2 listed below demonstrates how to request the calibration constants from the Model 2420 The program requests and displays the calibration constants for all ranges of both the volts and current source and measurement functions Program C 2 Requesting calibration constants Example program to request calibration constants Model 2420 primary address 24 OPEN IEEE FOR OUTPUT AS 1 Open IEEE 488 output path OPEN IEEE FOR INPUT AS 42 Open IEEE 488 input path PRINT 1 INTERM CRLF Set input terminator PRINT L OUTTERM LF Set output terminator PRINT L REMOTE 24 Put 2420 in remote PRINT L OUTPUT 24 RSI Restore defaults CLS PRINT L OUTPUT 24 SENS FUNC CONC OFF PRINT OUTPUT 24 SENS FUNC VOLT DC PRINT L OUTPUT 24 SOUR FUNC VOLT PRINT OUTPUT 24 CAL PROT CODE KI002420 Unlock calibration Range 2 Initial range 200mV PRINT Model 2420 Voltage Calibration Constants PRINT 41 OUTPUT 24 CAL PROT SENS DATA PRINT 41 ENTER 24 LINE INPUT 42 Data PRINT Data PRINT 41 OUTPUT 24 CAL PROT SOUR DATA PRINT 1 ENTER 24 INE INPUT 42 Data RINT Data Range Range 10 IF Range 200 THEN Range 60 LOOP WHILE
101. PLC Fast 0 01 Medium 0 1 Slow 1 CMRR 80 dB 80 dB 60 dB 100 dB 1 Except lowest 2 current ranges 90dB LOAD IMPEDANCE Stable into 20 000pF typical COMMON MODE VOLTAGE 250V DC 40V DC for Model 2440 COMMON MODE ISOLATION gt 10 Q lt 1000 OVERRANGE 105 of range source and measure VOLTAGE DROP BETWEEN INPUT OUTPUT AND SENSE TERMINALS 5 MAX SENSE LEAD RESISTANCE 1 for rated accuracy SENSE INPUT IMPEDANCE gt 10 Q GUARD OFFSET VOLTAGE lt 150pV typical 300pV for Models 2430 2440 SOURCE OUTPUT MODES Pulse Model 2430 only Fixed DC level Memory List mixed function Stair linear and log SOURCE MEMORY LIST 100 points max MEMORY BUFFER 5 000 readings 5 digits two 2 500 point buffers Includes selected measured value s and time stamp Lithium battery backup 3 yr bat tery life Specifications subject to change without notice SourceMeter is a registered trademark of Keithley Instruments Inc All other trademarks are the property of their respective companies PROGRAMMABILITY IEEE 488 SCPI 1995 0 RS 232 5 user definable power up states plus factory default and RST DIGITAL INTERFACE Interlock Active low input Handler Interface Start of test end of test 3 category bits 5 300mA supply Digital I O 1 trigger input 4 TTL Relay Drive outputs 33V 500mA diode clamped POWER SUPPLY 100V to 240V rms 50 60Hz automatically detected at powe
102. R 12V MMSZI2TI DZ 112 VR600 DIODE ZENER 6 4V IN4579 DZ 73 VR602 603 DIODE ZENER 6 2V MMSZ6V2 DZ 97 Y600 OSCILLATOR HIGH SPEED CMOS CR 37 12MHZ 6 11 6 12 Replaceable Parts Table 6 2 Digital board parts list Circuit designation Description sia BTI BATTERY BA 46 C1 3 77 11 14 16 17 20 22 23 25 26 30 CAP 1UF 10 25V CERAMIC C 495 1 C103 CAP 100UF 20 10V ALUM ELEC C 483 100 C104 CAP 10UF 20 63V ALUM ELEC C 403 10 C105 108 109 111 CAP 47UF 20 100V ALUM ELEC C 521 47 C107 110 CAPACITOR ALUM ELEC C 554 82 C113 115 117 119 CAPACITOR SMT C 551 10 C114 CAP 100UF 20 63V ALUM ELEC C 403 100 C116 CAP 100UF 20 16V ALUM ELEC C 530 100 C120 CAP 270PF 5 100V CERAMIC C 465 270P C121 CAP 390P 10 100V CERAMIC C 451 390P C122 CAP 47U 20 25V C 520 47 C19 69 85 75 92 CAP 1UF 10 25V CERAMIC C 495 1 C2 56 76 78 8 80 82 87 88 89 44 46 CAP 010 10 50V CERAMIC C 491 01 C24 96 CAPACITOR POLYESTER C 553 1 C27 32 34 36 CAP 1UF 20 50V CERAMIC C 519 1 C28 CAP 47P 596 100V CERAMIC C 465 47P C31 50 CAP 100PF 5 100V CERAMIC C 465 100P C33 63 74 93 CAP 047U 10 50V CERAMIC C 491 047 C35 22UF 20 25V TANTALUM C 440 22 C39 41 42 49 59 66 68 79 81 48 83 CAP 1UF 10 25V CERAMIC C 495 1 C4 10 CAP 15P 1 100V CERAMIC C 512 15P C43 CAP 33UF 10 50V CERAMIC C 464 33 C5 CAP 1UF 20 100V CERAMIC C 436 1 C51 CAP 33PF 10 1000V CERAMIC C 64 33P C54 60 45 53 C
103. R143 9 R298 R404 R426 R316 gt 219 2220 R244 8241 C249 m C203 C310 R313 2 C208 C260 IS J R217 C205 C Lui R554 o C664 V S q C663 R297 C324 N Na 226 S a a C201 R419 Q 9 C206 2 C258 R231 g e R202 amp E H C200 A R300 C306 606 R608 lt n C254 2 C259 Lo R509 R222 R221 605 a 204 8210 R600 2 C600 C601 N lt et N N o a lo amp R626 5 R508 NI DR C603 R226 8616 EH 3 el 4 e 2 R697 5 2 R620 8604 _ R560 R690 9 C528 d R691 E 8658 i R510 C582 C624 C618 C619 e R500 C614 R501 5 gt C581 C661 bien C623 3 611 613 A cos iS cozi ceri R502 R698 R613 R614 M N C584 R652 one S R69 se 660 C622 Cei L602 _ u C659 RA Nc A R581 C620 Bees R515 E R682 mi C651 2 C533 C570 3 P 5 2 T L600 O E R683 2 O C605 R561 A C609 2 o C569 R667 8719 R664 ms R623 8579 C606 C608 Y R665 R624 2 C558 C650 29 tn DE a R573 C652 CN R571 8570 5 R572 gt 2 R686 R660 R438 R441 R439 AG EN C OO C566 VA LS R685 C565 C568 2 el R575 ES 256 Co oo 1373 5 O 322 fe VU o It R290 ED b dal R374 R422 6251 D ec 2 2 ec Iw TEPE R309 R413 C NEN e R3
104. Step Command procedure Description 1 SOUR CURR RANGE Range Select source range 2 SOUR CURR lt value Establish negative full range polarity 3 Take DMM reading Read actual output value 4 CAL PROT SOUR DMM Reading Calibrate sense function negative full scale 2 Check 2420 for errors 6 CAL PROT SENS DMM Reading Calibrate source function negative full scale 7 Check 2420 for errors 8 SOUR CURR 0 0 Set output to 9 Take DMM reading Read actual output value 10 CAL PROT SOUR DMM Reading Calibrate sense function negative zero 11 Check 2420 for errors 12 CAL PROT SENS DMM Reading Calibration source function negative zero 13 Check 2420 for errors 14 SOUR CURR lt value Establish positive full range polarity 15 Take DMM reading Read actual output value 16 CAL PROT SOUR DMM Reading Calibrate sense function positive full scale 17 Check 2420 for errors 18 CAL PROT SENS DMM Reading Calibrate source function positive full scale 19 Check 2420 for errors 20 SOUR CURR 0 0 Set output to 0A 21 Take DMM reading Read actual output value 22 CAL PROT SOUR DMM Reading Calibrate source positive zero Perform complete procedure for each range where Range and Source value 10 6 100E 6 1E 3 10E 3 100E 3 1 or 3 2 DMM Reading parameter is multimeter reading from previous step 3 Use SYST ERR query to
105. T T Keyboard 1 Controller i I Lal I n i _ j Microcomputer i Analog pes Digital I Trigger GPIB Supply Supply Trigger Digital F interface GPIB 1 0 Link lt gt 19 buf aii ws fh 1 Line In Digital Section Power Supply Figure 4 2 Analog circuitry block diagram 42 42 85 85 V DAC W V Clamp Error Output Sense Output Amp Stage t Resistors HI I DAC AN iene cte Output L IFB n VFB Remote S Control VFB 9 IFB 7 e Protection E Guard A D MUX L Out Protection Guard 1 Sense 4 6 Troubleshooting D A converters control the programmed voltage and current or voltage compliance and current compliance Each DAC has two ranges a 10V full scale output or a 1V full scale output The DAC outputs are fed to the summing node FB Either the V DAC or the I DAC has the ability to control the main loop If the unit is set for SV source voltage it will source voltage until the compliance current is reached as determined by the I DAC setting and the current loop will override the volt age loop If however the unit is set for SI source current it will source current until the compli ance voltage is reached as determined by the V DAC setting and the voltage loop will override the current loop A priority bit in the Vclamp I clamp circuit controls these functions The error amplifier adds
106. THE TOP LEGS INTO THE CHASSIS SLOTS BY SLIGHTLY PRESSING INWARD NO CONNECT THE WIRES TO FRONT AND REAR PANEL 2d aE NOTE FOR FRONT PANEL WIRING INSTALL THE HOLDER PART OF THE WAY ON CHASSIS CONNECT THE WIRES TO PANEL THEN INSTALL HOLDER COMPLETELY ONTO CHASSIS 2430 2430 053 Pulse Board Chassis 557 PART NUMBER ani DESCRIPTION MODEL NEXT ASSEMBLY NEXT PROCESS STEP QTY 2430 040 FRONT PANEL ASSEMBLY USED ON 2430 050 ANALOG BOARD SHIELD ASSEMBLY 2430 05 CHASSIS ASSEMBLY DO NOT SCALE THIS DRAWING 44 4045 zi HEAD SCREW E na ENG E CHASSIS ANALOG BOARD ASSEMBLY 7 Tur E APPR 2001 3614 2 HOLDER Keithle Instruments Inc E MATERIAL NO t4 40x L 2PPHSEM 2 PHIL PAN HEAD SEM SCREW KEITHLEY C Isai thie 44139 FRAU 4 005 FRAC 221784 p 2430 052 SURFACE MAX FINISH L ES0 0 v2 0 ON 4 40X1 4PPH 5 REQ DX5 IN LBS 2430 1308 PULSE BOARD ASSEMBLY 2430 052 CHASSIS ASSEMBLY IHNEN i EET p 2430 2430 054 ___ FINAL CHASSIS ASSEMBLY 1 MODEL NEXT ASSEMBLY NEXT PROCESS STEP QTY USED ON DIMENSIONAL TOLERANCES TITLE DO NOT SCALE THIS DRAWING DATE 10 29 98 SCALE THER P F PART NUMBER DESCRIPTION UNLESS OTHERWISE SPECIPTED Fus Pulse Board Chassis Assembly 2430 052 ANALOG CHASSIS ASSEMBLY 015 ANG DRN Mot APPR 2430 130
107. U Select CAL and then press ENTER The Model 2420 will display the following CALIBRATION UNLOCK EXECUTE VIEW DATES p gt lt q SAVE LO CK CHANGE PASSWO RD 2 13 2 14 Calibration 10 Select SAVE and then press ENTER The instrument will display the following message SAVE CAL Press ENTER to continue EXIT to abort calibration sequence Press ENTER The unit will prompt you for the calibration date CAL DATE 2 15 97 Use lt q gt Y ENTER or EXIT Change the displayed date to today s date and then press the ENTER key Press ENTER again to confirm the date The unit will then prompt for the calibration due date NEXT CAL 2 15 98 Use lt q gt Y ENTER or EXIT Set the calibration due date to the desired value and then press ENTER Press ENTER again to confirm the date Once the calibration dates are entered calibration is complete and the following mes sage will be displayed CALIBRATION COMPLETE Press ENTER to confirm EXIT to abort Press ENTER to save the calibration data or press EXIT to abort without saving cali bration data The following message will be displayed CALIBRATION SU CCESS Press ENTER or EXIT to continue Press ENTER or EXIT to complete process Step 5 Lock out calibration 1 4 From normal display press MENU Select CAL and then press ENTER The Model 2420 will display the following CALIBRATION UNLOCK EXECUTE VIEW DATES p gt lt SAVE LO CK CHAN
108. V 5 5VF referenced to TP500 Digital circuitry checks Digital circuit problems can be checked out using Table 4 3 See Principles of operation for a digital circuit description Table 4 3 Digital circuitry checks Step Item component Required condition Remarks 1 Power on test RAM OK ROM OK Verify that RAM and ROM are functional 2 U3 pin 19 Digital common common signals referenced to digital common 3 U3 pin 7 5V Digital logic supply 4 U3 pin 68 Low on power up then goes high MPU RESET line D U3 lines A0 A19 Check for stuck bits MPU address bus 6 U3 lines 20 015 Check for stuck bits MPU data bus 7 U3 pin 66 16 78MHz MPU clock 8 U4 pin 7 Pulse train during RS 232 I O RS 232 RX line 9 U4 pin 8 Pulse train during RS 232 I O RS 232 TX line 10 U13 pins 34 42 Pulse train during IEEE 488 I O IEEE 488 data bus 11 U13 pins 26 31 Pulses during IEEE 488 488 command lines 12 U13 pin 24 Low with remote enabled TEEE 488 REN line 13 U13 pin 25 Low during interface clear TEEE 488 IFC line 14 U3 pin 43 Pulse train D_ADDATA 15 U3 pin 44 Pulse train D_DATA 16 U3 pin 45 Pulse train D_CLK 17 U3 pin 47 Pulse train D_STB 4 12 Troubleshooting Analog circuitry checks Table 4 4 summarizes analog circuitry checks Table 4 4 Analog circuitry checks Step Item component Required condition Remarks 1 TP200 gt 60V voltage protection 13V XIV 2 TP201 SOURCE
109. additional in formation Table 3 1 Power line fuse Line voltage Rating Keithley part no 90 250V 250V 3 15A Slow FU 106 3 15 Blow 5 x 20mm 3 4 Routine M aintenance Troubleshooting 4 2 Troubleshooting Introduction This section of the manual will assist you in troubleshooting and repairing the Model 2420 Included are self tests test procedures troubleshooting tables and circuit descriptions Note that dis assembly instructions are located in Section 5 and component layout drawings are at the end of Section 6 WARNING The information in this section is intended for qualified service personnel only Do not perform these procedures unless you are qualified to do so Some of these procedures may expose you to hazardous voltages that could cause personal injury or death Use caution when working with hazardous voltages Repair considerations Before making any repairs to the Model 2420 be sure to read the following considerations CAUTION The PC boards are built using surface mount techniques and require special ized equipment and skills for repair If you are not equipped and or qualified it is strongly recommended that you send the unit back to the factory for re pairs 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 recom
110. ard Chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections If you are using a test fixture keep the lid closed while power is applied to the device under test Safe operation requires the use of a lid interlock Ifa screw is present connect it to safety earth ground using the wire recommended in the user documentation The A symbol on an instrument indicates that the user should refer to the operating instructions located in the manual The A symbol on an instrument shows that it can source or measure 1000 volts or more including the 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 p
111. asurement accuracy 1 10 Warm up period 1 2 2 2 Service Form Model No Serial No Date Name and Telephone No Company List all control settings describe problem and check boxes that apply to problem Intermittent Analog output follows display Particular range or function bad specify IEEE failure Obvious problem on power up Batteries and fuses are OK Front panel operational All ranges or functions are bad Checked all cables Display or output check one Drifts Unable to zero Unstable Overload Will not read applied input Calibration only Certificate of calibration required Data required attach any additional sheets as necessary Show a block diagram of your measurement including all instruments connected whether power is turned on or not Also describe signal source Where is the measurement being performed factory controlled laboratory out of doors etc What power line voltage is used Ambient temperature F Relative humidity Other Any additional information If special modifications have been made by the user please describe Be sure to include your name and phone number on this service form Specifications are subject to change without notice All Keithley trademarks and trade names are the property of Keithley Instruments Inc All other trademarks and trade names are the property of their re
112. both the front and rear inputs INPUT OUTPUT HI and LO 4 WIRE SENSE HI and LO V O GUARD and GUARD SENSE rear panel only Remove all the connections by pulling the wires off the pin connectors then remove the fer rite noise filters from the chassis During re assembly use the following table to identify input terminals Input terminals Front wire color Rear wire color INPUT OUTPUT HI Red White Red INPUT OUTPUT LO Black White Black 4 WIRE SENSE HI Yellow White Yellow 4 WIRE SENSE LO Gray White Gray V GUARD White GUARD SENSE Blue White 2 Unplug cables Carefully unplug the ribbon cables at J1027 J1028 and J1029 Unplug the ON OFF cable at J1034 Disassembly 5 5 3 Remove screws Remove the two fastening screws that secure the analog board assembly to the chassis These screws are located on the side of the board opposite from the heat sink Remove the two screws that secure the heat sink to the chassis 4 Remove analog board assembly After all screws have been removed carefully lift the analog board assembly free of the main chassis 5 Disassemble analog board assembly Remove the screws that secure the analog board and heat sink to the analog board subchassis Carefully remove the heat sink by sliding the clips off the power transistors CAUTION Be careful not to damage the heat sink insulation layer Remove the analog board from the subchassis Remove the
113. brator you cannot use the Auto Ohms mode of the Model 2420 to verify the 2Q range The 1A test current for the 20 range of the Model 2420 will damage the calibrator On the Model 2420 use the CONFIG OHMS menu to select the MANUAL source mode and then set the source test current to 100mA 1 15 With the power off connect the resistance calibrator to the Model 2420 INPUT OUT PUT and 4 WIRE SENSE jacks as shown in Figure 1 4 Be sure to use the 4 wire con nections as shown Model 2420 Output HI Sense HI oo i Sense LO Resistance Calibrator O utput LO 1 16 Performance Verification NOTE 6 Select the resistance calibrator external sense mode Configure the Model 2420 ohms function for the 4 wire sense mode as follows Press CONFIG then MEAS The instrument will display the following CONFIG OHMS SOURCE SENSE MODE GUARD Select SENSE MODE and then press ENTER The following will be displayed SEN SE MODE 2 WIRE 4 WIRE Select 4 WIRE and then press ENTER Press EXIT to return to normal display Press MEAS to select the ohms measurement function and make sure the source out put is turned on Verify ohms measurement accuracy for each of the resistance values listed in Table 1 7 For each measurement Setthe resistance calibrator outp
114. bus SRQ Service Request when an er Occurs send the following command SRE 4 This command will enable SRQ when the EAV bit is set You can then read the status byte and error queue as outlined above to check for errors and to determine the exact nature of the error B 10 Command Reference Detecting calibration step completion When sending remote calibration commands you must wait until the instrument completes the current operation before sending another command You can use either OPC or OPC to help determine when each calibration step is completed Using the PC query With the OPC operation complete query the instrument will place an ASCII 1 in the out put queue when it has completed each step To determine when the OPC response is ready do the following 1 Repeatedly test the Message Available bit bit 4 in the status byte and wait until it is set You can request the status byte by using the STB query 2 When MAV is set a message is available in the output queue and you can read the output queue and test for an ASCII 1 3 After reading the output queue repeatedly test MAV again until it clears At this point the calibration step is completed Using the O PC command The OPC operation complete command can also be used to detect the completion of each calibration step In order to use OPC to detect the end of each calibration step do the following Enable operation complete by
115. check for errors Step 4 Program calibration dates Use following commands to set the calibration date and calibration due date CAL PRO T DATE year month day Calibration date CAL PRO T N DUE year month day N ext calibration due date Note that the year month and date must be separated by commas The allowable range for the year is from 1997 to 2096 the month is from 1 to 12 and the date is from 1 to 31 Step 5 Save calibration constants Calibration is now complete so you can store the calibration constants in EEROM by sending the following command CAL PRO T SAVE 2 22 Calibration NOTE Calibration will be temporary unless you send the SAVE command Also calibra tion data will not be saved if 1 calibration is locked 2 invalid data exists or 3 all steps were not completed Step 6 Lock out calibration To lock out further calibration send the following command after completing the calibration procedure CAL PRO T LO CK Single range calibration Normally the complete calibration procedure should be performed to ensure that the entire instrument is properly calibrated In some instances however you may want to calibrate only certain ranges To do so complete the entire procedure only for the range s to be calibrated Keep in mind however that you must complete all parameter steps for each source or sense range Also be sure to set calibration dates and save calibratio
116. commended calibration equipment sse 2 3 10 resistor characterization 2 4 Unlocking calibration eerte 2 4 Unlocking calibration from the front panel 2 4 Unlocking calibration by remote sss 2 5 Changing the password 2 6 Changing the password from the front 2 6 Changing the password by remote sse 2 6 Resetting the calibration password see 2 6 Viewing calibration dates and calibration count 2 7 Calibration errors eee Reboot 2 7 Front panel error reporting iii 2 7 Remote error reporting ukuman ass 2 7 Front panel calibration u QS u 2 7 Remote calibration De ette 2 14 Remote calibration commands eee 2 14 Recommended calibration parameters esses 2 15 Remote calibration procedure iii 2 17 Single range Calibration eene 2 22 3 Routine Maintenance Infrod ucti nm s nino 3 2 Line fuse replacement ince sec eee aet 3 2 4 Troubleshooting Introduction eer dep etn Dese teo Redde 4 2 Repair considerations ica oot So ctore eee dee me rese ee 4 2 Power
117. ction To use this command you must 1 program the source to the correct value 2 select the range being calibrated and 3 send the CAL PROT SENS command for each parameter listed in Table B 2 When the Model 2420 receives this command it will attempt to place the pa rameter into one of the three parameter ranges summarized in Table B 2 de pending on the active SENS FUNC and range If the parameter does not fit into any of the three allowed ranges an error number 222 Parameter data out of range will be generated Once the unit has successfully selected the appropriate parameter range it will then check to see if autorange for the ac tive SENS FUNC is enabled If so an error number 221 Settings con flict will be generated If no error occurs the active sense function range point will be calibrated using the corresponding parameter Note that parameters for a given sense function and range may be sent in any order however once one CAL PROT SENS command executes the other two must also be executed or an error number 200 Execution error will occur when the CAL PROT SAVE command is processed at the end of the calibration procedure CAL PROT SENS 2 Calibrate 2V sense range B 6 Command Reference Table B 2 Recommended CALibration PROTected SENSe parameter ranges Sense range 0 2V 2V 20V 60V 10uA 1004A ImA 10mA 100mA 1A 3A First parameter Second parameter Third parameter
118. d local laws WARNING precautions below must be followed to avoid personal injury Wear safety glasses or goggles when working with lithium batteries Do not short the battery terminals together Keep lithium batteries away from all liquids Do not attempt to recharge lithium batteries Observe proper polarity when inserting the battery in its holder e incinerate or otherwise expose the battery to excessive heat gt 60 C e Bulk quantities of lithium batteries should be disposed of as a hazardous waste Troubleshooting 4 13 Battery replacement procedure Remove the case cover and analog board assembly as covered in Section 5 Locate the battery on the digital board Carefully unsolder and remove the old battery Install and solder the new battery in place Re assemble the instrument and turn it on The Reading buffer data lost error message will be displayed 6 Send the SYST MEM INIT command via remote to perform the following Clear the reading buffer Initialize instrument setups through 4 to present instrument settings SEB EE nitialize all 100 source memory locations to present instrument settings Delete user math expressions No comm link error A Comm Link error indicates that the front panel processor has stopped communicating with the main processor which is located on the digital board This error indicates that one of the main processor ROMs may
119. dd GA 30A ST 3 21 01 2430 10001 e CI 26061 2430 10001 Was 2430 1000 ANALOG BOARD ASSEMBLY 3 amp 2 2 56 3 6 4 REQ D 4 IN LBS HS 49 2A HEAT SINK 8 REQ D 4 REQ D 5 IN LBS 10 IN LBS DETAIL A 2420 3088 HEAT SINK ai 3 REF 7 4 40 2420 315A TRANSISTOR BAR 4 REQ D 222 6 32x3 16PPHSEM REF THERMISTOR FROM BOARD 2420 160A SHIELD BOARD STAKED A GA 30A GROMMET STRIP 1 3 4 LONG ASTU aa alana Ei 2410 321A INSULATOR USE T 7747 TO INSTALL INSULATOR TO HEAT SINK 84 40x 7 4PPHSEM 2 REQ D 5 IN LBS 2400 321A INSULATOR 2 REQ D 2420 309A BOTTOM SHIELD lt PART NUMBER QTY DESCRIPTION 2430 10001 ANALOG BOARD ASSEMBLY 2420 160A SHIELD BOARD STAKED 2420 3088 HEAT SINK lt lt 2420 309A BOTTOM SHIELD lt 7 2420 3154 4 TRANSISTOR BAR 2 ae 2420 3088 HEAT SINK 2410 3214 INSULA SEE DETAIL A FOR MOUNTING 2400 321 2 INSULATOR 2430 2430 052 Chassis Analog Assembly 2 56x3 16PPH 4 PHIL PAN HEAD SCREW MODEL NEXT ASSEMBLY NEXT PROCESS STEP QTY 4 40x1 4PPHSEM 2 PHIL PAN HEAD SEM SCREW USED ON 4 40x1 2PPHSEM 4 PHIL PAN HEAD SEM SCREW DIMENSIONAL TOLERANCES TITLE 2 DO NOT SCALE THIS DRAWING b y tii S A SCALE VS ANALOG BOARD HEAT SINK HS 49 2A 8 HEAT SINK 015 ANG 1 DRN mat 85 15 SHIELD ASSEMBLY DU D ae ao HEAD SE SCREW LEY S u s XXX 005 FRAC A 1 64 MATERIAL gt NO ST 2430 050
120. e PC boards by the edges and shields Do not touch any board traces or components not associated with repair Do not touch areas adjacent to electrical contacts e Use dry nitrogen gas to clean dust off PC boards Solder repairs Observe the following precautions when you must solder 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 After cleaning allow the board to dry in a 50 C low humidity environment for several hours Disassembly 5 3 Static sensitive devices CMOS devices operate at very high impedance levels Therefore any static that builds up on you or your clothing may be sufficient to destroy these devices if they are not handled properly Use the following precautions to avoid damaging them CAUTION Many CMOS devices are installed in the Model 2420 Handle all semicon ductor devices as being static sensitive Transport and handle ICs only in containers specially designed to prevent static build up Typically you will receive these parts in anti static containers made of plastic or foam Keep these devices in their original containers until ready for installat
121. e calibration procedures Format cal prot code lt password gt Parameter Up to a 8 character string including letters and numbers Description The CODE command sends the password and enables calibration when per forming these procedures via remote The correct password must be sent to the unit before sending any other calibration command The default remote password is KI002420 Note The CODE command should be sent only once before performing calibration Do not send CODE before each calibration step To change the code first send the present code then send the new code The password parameter must be enclosed in single quotes f you change the first two characters of the password to something other than you will not be able to unlock calibration from the front panel Example CAL PROT CODE KI002420 Send default code of 1002420 COUNT C ALibration PRO Tected CO UN T Purpose To request the number of times the Model 2420 has been calibrated Format cal prot count Response Number of times calibrated Description The COUNT query may be used to determine the total number of times the Model 2420 has been calibrated Example CAL PROT COUNT Request calibration count LO CK CALibration PRO Tected LO CK Purpose To lock out calibration Format cal prot lock Query cal prot lock Response 0 Calibration unlocked Calibration locked B 4 Command Reference Description No
122. e mee 5 3 Analog board removal seen 5 4 Digital board remioyal eene eere tentent 5 5 Front panel disassembly see 5 6 Removing power COMponeEntS iii iii 5 6 Power module removal i 5 6 Instrument re assemblY e ns 5 7 6 Replaceable Parts IntrodUcton dean tee tee 6 2 Parts StS ss oer RT mm tpe 6 2 Ordering information 6 2 Factory Set V1Ce u ap err e ect 6 2 Component 1 eene trementem nennen eres 6 2 A Specifications Accuracy calculations 5 te tetendit A 10 Measurement enne A 10 accuracy eter IR ete renes te A 10 B Command Reference Introdu ction ne eere Uere eret ertet Ped B 2 Command summlaty 3 ed bere IRE eei ritiene B 2 Miscellaneous commands sese B 3 Detecting calibration errors B 8 Reading the error queue B 8 Error summary doe RU Ute rete topics B 8 Status byte Error Available bit B 9 Generating an SRQ on B 9 Detecting calibration step 22 B 10 Using the OPC query sia nana
123. e that the test equipment is properly warmed up and connected to the Model 2420 front panel INPUT OUTPUT jacks Also be certain that the front panel jacks are selected with the TERMINALS switch Always allow the source signal to settle before calibrating each point Do not connect test equipment to the Model 2420 through a scanner or other switching equipment Ifan error occurs during calibration the Model 2420 will generate an appropriate error message See Appendix B for more information WARNING The maximum common mode voltage voltage between LO and chassis ground is 250V peak Exceeding this value may cause a breakdown in in sulation creating a shock hazard CAUTION maximum voltage between INPUT OUTPUT HI and LO or 4 WIRE SENSE HI and LO is 75V peak The maximum voltage between INPUT OUTPUT HI and 4 WIRE SENSE HI or between INPUT OUTPUT LO and 4 WIRE SENSE LO is 5V Exceeding these voltage values may result in instrument damage Calibration cycle Perform calibration at least once a year to ensure the unit meets or exceeds its specifications Recommended calibration equipment Table 2 1 lists the recommended equipment for the calibration procedures You can use al ternate equipment as long that equipment has specifications at least as good as those listed in the table For optimum calibration accuracy test equipment specifications should be at least four times better than corresponding Model 2420 specifications
124. e to select the rear panel jacks with the front panel TERMINALS key Performance Verification 1 13 Table 1 5 Output current accuracy limits Model 2420 Model 2420 Output current limits source range output current setting 1 year 18 28 10 10 0000 9 9947 to 10 0053 1004A 100 0004 A 99 949 to 100 051 ImA 1 00000mA 0 99946 to 1 00054mA 10 10 0000mA 9 9935 to 10 0065mA 100mA 100 000mA 99 914 to 100 086mA 1 1 00000 0 99843 to 1 00157A 3A 3 00000A 2 99553 to 3 00447A See separate procedure for 3A range DMM voltage reading is same as sourced current Specifications valid for continuous output currents below 105mA For operating above 105mA on the 1A range for gt 1 minute derate accuracy 10 100mA above 105mA For operating above 105mA on the 3A range for gt 1 minute derate accuracy 10 300mA above 105mA Current measurement accuracy Follow the steps below to verify that Model 2420 current measurement accuracy is within specified limits The procedure involves applying accurate currents from the Model 2420 current source and then verifying that Model 2420 current measurements are within required limits 10uA to 1A range accuracy 1 With the power off connect the digital multimeter to the Model 2420 INPUT OUTPUT jacks as shown in Figure 1 2 2 Selectthe multimeter DC current function 3 Setthe Model 2420 to both source and measure current by pressing the SOURCE I and ME
125. ed 100us typical Resistive load 10pA to 100mA range OUTPUT SLEW RATE 30 Model 2400 0 5V us 200V range 100mA compliance 0 08V us 20V range 100mA compliance Model 2410 0 5V us 1000V range 20mA compliance 0 08V us 20V range 100mA compliance Model 2420 0 14V us 60V range 100mA compliance 0 08V us 20V range 100mA compliance Model 2425 2430 0 25V us 100V range 100mA compliance 0 08V us 20V range 100mA compliance 0 25V us 40V range 100mA compliance 0 08V us 10V range 100mA compliance DC FLOATING VOLTAGE Output can be floated up to 250VDC Model 2440 40VDC from chassis ground REMOTE SENSE Up to 1V drop per load lead COMPLIANCE ACCURACY Add 0 3 of range and 0 02 of reading to base specification OVER TEMPERATURE PROTECTION Internally sensed temperature overload puts unit in standby mode RANGE CHANGE OVERSHOOT Overshoot into a fully resistive 100kQ load 10Hz to 1MHz BW adjacent ranges 100mV typical except 20V 200V 20V 60V on Model 2420 20V 100V on Model 2425 and 2430 range boundary and Model 2440 MINIMUM COMPLIANCE VALUE 0 1 of range Model 2440 ADDITIONAL PULSE MODE SOURCE SPECIFICATIONS MAXIMUM DUTY CYCLE 8 hardware limited 10A range only All other ranges 100 MAXIMUM PULSE WIDTH 5ms from 90 rising to 90 falling edge 2 5ms 10A range MINIMUM PULSE WIDTH 15015 MINIMUM PULSE RESOLUTION 50us typical 7015 max limited by sys tem jitter
126. ed copy of this print history page Revision A Document Number 2420 902 01 Addendum A Document Number 2420 902 02 Revision B Document Number 2420 902 01 ii Revision C Document Number 2420 902 01 a a s Revision D Document Number 2420 902 01 Revision E Document Number 2420 902 01 i Keithley product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand names are trademarks or registered trademarks of their respective holders Safety Precautions The following safety precautions should be observed before using this product and any associated 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
127. efore making a measurement Do not connect test equipment to the Model 2420 through a scanner multiplexer or other switching equipment WARNING maximum common mode voltage voltage between LO and chassis ground is 250V peak Exceeding this value may cause a breakdown in in sulation creating a shock hazard CAUTION maximum voltage between INPUT OUTPUT HI and LO or 4 WIRE SENSE HI and LO is 75V peak The maximum voltage between INPUT OUTPUT HI and 4 WIRE SENSE HI or between INPUT OUTPUT LO and 4 WIRE SENSE LO is 5V Exceeding these voltage values may result in instrument damage Setting the source range and output value Before testing each verification point you must properly set the source range and output val ue as outlined below 1 Press either the SOURCE V or SOURCE I key to select the appropriate source function Press the EDIT key as required to select the source display field Note that the cursor will flash in the source field while its value is being edited With the cursor in the source display field flashing set the source range to the lowest pos sible range for the value to be sourced using the up or down RANGE key For example you should use the 20V source range to output a 20V source value With a 20V source value and the 20V range selected the source field display will appear as follows Vsrc 20 0000 V With the source field cursor flashing set the source output to the required value using
128. eter does not fit into any of the four allowed ranges an error number 222 Parameter data out of range will be generated Once the unit has successfully selected the appropriate parameter range it will then check to see if iftheactivesourceis programmed to a value within the selected parameter range and that OUTP STAT is ON Ifthe active source is not programmed to a value within the parameter range or if the source is in autorange or in standby an error num ber 221 Settings conflict will be generated If no error occurs the active source function range point will be calibrated using the corresponding pa rameter Table B 3 Example Command Reference B 7 Note that parameters for a given source function and range may be sent in any order however once one CAL PROT SOUR command executes the other three must also be executed or an error number 200 Execution error will occur when the CAL PROT SAVE command is processed at the end of the calibration procedure Because the source is calibrated for both positive and negative values two Zero calibration points are required The Model 2420 automatically uses the appropriate zero parameter based on whether the source polarity is positive or negative CAL PROT SOUR 2 Calibrate 2V source range Recommended CALibration PROTected SOURce parameter ranges Source First parameter Second parameter Third parameter Fourth parameter range negative full scale
129. f connect the Model 2420 and the digital multimeter to the IEEE 488 interface of the computer Be sure to use shielded IEEE 488 cables for bus connections 2 the computer the Model 2420 and the digital multimeter Allow the Model 2420 and the multimeter to warm up for at least one hour before performing calibration 3 Make sure the Model 2420 is set for a primary address of 24 Use the front panel MENU GPIB selection to check or change the address Calibration Programs C 3 4 sure the digital multimeter primary address is set to its factory default setting 22 5 Make sure that the computer bus driver software is properly initialized 6 Enter the QBasic editor and type in the program below NOTE sure to change the OneOhm parameter to the characterized value of 19 resistor See Section 2 for details Check thoroughly for errors then save it using a convenient filename Run the program and follow the prompts on the screen to perform calibration For test connections refer to the following figures in Section 2 DMM volts connections Figure 2 1 10 to range current connections Figure 2 2 1Q resistor and DMM connections for 3A range Figure 2 3 C 4 Calibration Programs Program C 1 Model 2420 calibration program Model 2420 calibration program for use with the H P3458A Digital Multimeter Rev 1 0 1 16 97 2420 primary address 24 HP3458A primary addre
130. following PASSWORD Use A V ENTER or EXIT Use the up and down RANGE keys to select the letter or number and use the left and right arrow keys to choose the position Press down RANGE for letters up RANGE for numbers Enter the present password on the display Front panel default 002420 Calibration 2 5 4 Once the correct password is displayed press the ENTER key If the password was cor rectly entered the following message will be displayed CALIBRATION UNLO CKED Calibration can now be executed 5 Press EXIT to return to normal display Calibration will be unlocked and assume the states summarized in Table 2 2 Attempts to change any of the settings listed below with calibration unlocked will result in an error 510 Not permitted with cal un locked NOTE With calibration unlocked the sense function and range track the source function and range That is when SOUR FUNC is set to VOLT the SENS FUNC setting will be VOLT DC When SOUR FUNC is set to CURR the SENS FUNC setting will be CURR DC A similar command coupling exists for SOUR VOLT RANG SENS VOLT RANG and SOUR CURR RANG SENS CURR RANG Table 2 2 Calibration unlocked states Mode State Equivalent remote command Concurrent Functions OFF SENS FUNC CONC OFF Sense Function Source SENS FUNC lt source_ function gt Sense Volts NPLC 1 0 SENS VOLT NPLC 1 0 Sense Volts Range Source V SENS VOLT RANG source V range Sense Current NPLC 1
131. g OPC GOSUB ErrCheck Calibration Programs GOSUB CalEnd CASE 5 11 PRINT 1 OUTPUT 24 Cmd GOSUB ReadDMM CASE 8 PRINT 41 OUTPUT 24 Cmd Source GOSUB ReadDMM END SELECT NEXT I Range Range 10 IF 7 1 AND Range 200 THEN Range 60 IF J 2 AND Range gt 9 AND Range 11 THEN Range 3 PRINT 1 OUTPUT 24 00 5 OFF PRINT 1 OUTPUT 22 FUNC DCV AUTO PRINT Connect 1 Ohm resistor and DMM volts input to 2420 GOSUB KeyCheck PRINT 1 OUTPUT 24 OUTP STAT ON END IF Source Range WEND NEXT J PRINT OUTPUT 24 O0UTP STAT OFF LINE INPUT Enter calibration date yyyy mm dd D PRINT OUTPUT 24 CAL PROT DATE D LINE INPUT Enter calibration due date yyyy mm dd DS PRINT OUTPUT 24 CAL PROT NDUE D PRINT OUTPUT 24 CAL PROT SAVE Save calibration constants GOSUB ErrCheck PRINT OUTPUT 24 CAL PROT LOCK Lock out calibration PRINT Calibration completed PRINT OUTPUT 24 RST PRINT LOCAL 22 24 CLOSE END Y KeyCheck Check for key press routine WHILE INKEYS lt gt WEND Flush keyboard buffer PRINT DO IS INKEY IS 2 RETURN Y CalEnd DO PRINT 41 INPUT LOOP UNTIL S DE 7 SR 2 THEN EndProg 5 PRINT 1 OUTPUT 24 ESR PRINT 1 ENTER 24 INPUT 42 S PRINT 1 SPOLL 24 PRINT Press any key to continue LOOP WHILE I ESC to abort progra
132. g continued storage of data buffer information during power down cycles and flash ROM support allows internal firmware upgrades using either the serial or GPIB port for downloading new firmware calibration constants and the save 0 setup are stored in a separate serial EE PROM Setups 1 through 4 are stored in battery backed up RAM External communication is provided via GPIB and serial interfaces A 9914 GPIB IEEE 488 standard interface IC is used for the GPIB and a 68332 Queued Serial Module QSM provides the serial UART For internal communications the Time Processing Unit TPU is used for serial communications with the front panel display module and both the TPU and QSM handle digital to analog interfacing Troubleshooting 4 9 Figure 4 5 n Digital circuitry block diagram U15 U16 U12 U14 Serial Reset amp 4 Interface CC Y RS 232 Interface 04 E PROM 4 Microprocessor GPIB U17 U3 U6 U13 C IEEE 488 Interface U20 A D Control D ata Interface 09 025 To Display gt Board Controller 16 78MHz lt Voltage Source Trigger Control b gt Trigger U23 Digital 1 0 Digital U7 1 0 Display board circuit theory Display board components are shown in the digital circuitry block diagram in Figure 4 5 U902 is the
133. g on the present measurement range the compliance setting is the compliance limit If the compliance setting is higher than the measurement range the maximum reading on that measurement range is the compliance limit Taking the SourceMeter out of compliance Verification measurements should not be made when the SourceMeter is in compliance For purposes of the verification tests the SourceMeter can be taken out of compliance by going into the edit mode and increasing the compliance limit NOTE Donottake the unit out of compliance by decreasing the source value or changing the range Always use the recommended range and source settings when performing the verification tests Performance Verification 1 9 O utput voltage accuracy Follow the steps below to verify that Model 2420 output voltage accuracy is within specified limits This test involves setting the output voltage to each full range value and measuring the voltages with a precision digital multimeter 1 With the power off connect the digital multimeter to the Model 2420 INPUT OUTPUT jacks as shown in Figure 1 1 Figure 1 1 Connections for voltage verification tests Model 2420 Input HI ESSA Digital M ultimeter Input LO 2 Select the multimeter DC volts measuring function 3 Setthe voltage
134. he display board and or the pushbutton switch pad 1 2 4 Unplug the display board ribbon cables Remove the front panel assembly This assembly has four retaining clips that snap onto the chassis over four pem nut studs Two retaining clips are located on each side of the front panel Pull the retaining clips outward and at the same time pull the front panel assembly forward until it separates from the chassis Using a thin bladed screw driver pry the plastic PC board stop located at the bottom of the display board until the bar separates from the casing Pull the display board from the front panel Remove the switch pad by pulling it from the front panel Removing power components The following procedures to remove the power supply and or power module require that the case cover and motherboard be removed as previously explained Power module removal Perform the following steps to remove the rear panel power module 1 2 3 Remove the analog board Unplug the cable connecting the power module to the digital board Disconnect the power module s ground wire This green and yellow wire connects to a threaded stud on the chassis with a kep nut Squeeze the latches on either side of the power module while pushing the module from the access hole WARNING To avoid electrical shock which could result in injury or death the ground wire of the power module must be connected to chassis ground When in stalling t
135. he 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 5 4 Disassembly 2 Removemounting 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 3 Remove rear bezel To remove the rear bezel loosen the two screws that secure the rear bezel to the chassis then pull the bezel away from the case 4 Remove grounding screws Remove the two grounding screws that secure the case to the chassis They are located on the bottom of the case at the back 5 Remove chassis To remove the case grasp the front bezel of the instrument and care fully slide the chassis forward Slide the chassis out of the metal case NOTE gain access to the components under the analog board shield remove the shield which is secured to the analog board by a single screw Analog board removal Perform the following steps to remove the analog board This procedure assumes that the case cover is already removed 1 Disconnect the front and rear input terminals You must disconnect these input terminal connections for
136. he power module be sure to re connect the green and yellow ground wire to the threaded stud on the chassis Disassembly 5 7 Instrument re assembly Re assemble 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 en sure proper operation replace the analog signal wire ferrite noise filters and securely fasten the shield WARNING To ensure continued protection against electrical shock verify that power line ground green and yellow wire attached to the power module is con nected to the chassis Also make sure the two bottom case screws are properly installed to secure and ground the case cover to the chassis 5 8 Disassembly nissan LTR NO REVISION ENG DATE ON A2 22133 2430 3138 Was 2420 313A ST 2 2 99 A3 24266 2400 1100 Was 2400 01 11 ST 3 11 00 A4 24050 2400 3068 Was Rev A ST 372270 STEP 5 24934 2400 305 WAS 2400 3068 CHG D PART LIST T 9 19 00 a REF 2400 3068 PANEL A6 25155 2420 004 WAS 2430 004 ST 11 8 01 AT 26061 2420 004 1 118 1 Was PL 94 N 2420 004 PL 118 1 ASSEMBLY STEP 2 4 FL
137. hooting Display board checks essen 4 10 Power supply Checks teer 4 11 Digital circuitry 4 11 Analog circuitry CheCkS iii 4 12 6 Replaceable Parts Analog board parts list 6 3 Digital board parts 160 6 12 Display board parts liSst sse 6 17 Mechanical parts HS urea et RN 6 18 B Command Reference Remote calibration command summary B 2 Recommended CAL PROT SENS parameter ranges B 6 Recommended CAL PROT SOUR parameter ranges B 7 CalibratiOn errots na B 9 Performance Venfication 1 2 Performance Verification Introduction Use the procedures in this section to verify that Model 2420 accuracy is within the limits stated in the instrument s one year accuracy specifications You can perform these verification procedures When you first receive the instrument to make sure that it was not damaged during shipment e verify that the unit meets factory specifications e determine if calibration is required Following calibration to make sure it was performed properly WARNING information in this section is intended for qualified service personnel only Do not attempt these procedures unless you are qualified to do so Some of these procedures may expose y
138. iaia B 10 Using OPC command aaa 10 Generating SRQ on calibration complete B 11 C Calibration Programs Introduction en C 2 Computer hardware requirements see C 2 Software C 2 Calibration equipment iii C 2 General program Instructions ii C 2 Program C 1 Model 2420 calibration program C 4 Requesting calibration 2 C 7 Program C 2 Requesting calibration constants C 7 List of Illustrations l Performance Verification Connections for voltage verification tests 1 9 Connections for10puA to range current verification tests 1 11 Connections for range current verification tests 1 12 Connections for resistance accuracy verification 1 15 2 Calibration Voltage calibration test connections see 2 8 10uA to 1A range current calibration test connections 2 10 range current calibration test connections 2 12 3 Routine Maintenance Rear panel iss soci o tt TU hane teet tete 3 2 4 Troubleshooting Overall block diagram sse 4 5 Analog circuitry block diagram
139. ion Remove the devices from their protective containers only at a properly grounded work station Also ground yourself with a suitable wrist strap Handle the devices only by the body do not touch the pins Ground any printed circuit board into which a semiconductor device is to be inserted to the bench or table Use only anti static type desoldering tools Use only grounded tip solder irons Once the device is installed in the PC board it is normally adequately protected and you can handle the boards normally Assembly drawings Use the assembly drawings located at the end of this section to assist you as you disassemble and re assemble the Model 2420 Also refer to these drawings for information about the Kei thley part numbers of most mechanical parts in the unit Assembly drawings include Front panel assembly 2430 040 Analog board heat sink shield assembly 2430 050 Chassis assembly 2430 051 Chassis analog board assembly 2430 052 Final chassis assembly 2430 053 Case cover removal Follow the steps below to remove the case cover to gain access to internal parts WARNING Before removing the case cover disconnect the line cord and any test leads from the instrument 1 Remove handle The handle serves as an adjustable tilt bail 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 t
140. ity is provided by 0500 0511 Coarse current limits are built into the output stage A D converter The SourceMeter unit uses a multi slope charge balance A D converter with a single slope run down The converter is controlled by gate array U610 Commands are issued by the MPU on the digital board through communications opto isolators to U610 and U610 sends A D read ing data back through opto isolators to the digital board for calibration and processing Active guard The Model 2420 has an active guard or six wire ohms circuit used to measure complex de vices This circuitry provides a low current 50mA equivalent of the voltage on output HI If the unit is in the SV mode the low current equivalent of the source voltage will appear on the guard terminal If the unit is in the SI mode the voltage on output HI is equal to the source cur rent multiplied by the external resistance value An equivalent voltage will be generated by the guard circuit and a guard sense terminal is provided to sense around the voltage drop in the guard leads since significant current can flow 50mA Digital circuitry Refer to Figure 4 5 for the following discussion on digital circuitry The core digital circuitry uses a Motorola 68332 microcontroller running at 16 78MHz The memory configuration includes two 256K X 8 bit flash EEPROMs and two 128K X 8 bit RAMs used in parallel to utilize the 16 bit data bus of the MPU The RAM is battery backed up pro vidin
141. lect the correct source range Set the Model 2420 output current to the correct value Verify that the multimeter reading is within the limits given in the table Repeat the procedure for negative output currents with the same magnitudes as those listed in Table 1 5 Repeat the entire procedure using the rear panel INPUT OUTPUT jacks Be sure to select the rear panel jacks with the front panel TERMINALS key 3A range accuracy With the power off connect the digital multimeter and the 10 resistor to the Model 2420 INPUT OUTPUT jacks as shown in Figure 1 3 10 Resistor Model 2420 Input HI Digital M ultimeter Select the multimeter DC volts measuring function Press the Model 2420 SOURCE I key to source current and make sure the source output is turned on Verify output current accuracy for the 3A range Be sure to Select the 3A source range Set the Model 2420 output current to the correct 3A output value Verify that the multimeter reading is within the range limits given in Table 1 5 Since the value of the 1Q resistor value is assumed to be the same as its nominal value the DMM voltage reading is the same as the sourced current Repeat the procedure for a negative 3A current output value Repeat the entire procedure using the rear panel INPUT OUTPUT jacks Be sur
142. lt nrf gt Calibrate active source range See Table 2 7 parameters DATA Query source cal constants for active range Calibration data will not be saved if 1 Calibration was not unlocked with CODE command 2 Invalid data exists For example cal step failed or was aborted 3 Incomplete number of cal steps were performed For example omitting a negative full scale step Ranges that calibrated successfully will be saved if calibration is unlocked Ranges that failed will not be saved Recommended calibration parameters The maximum calibration command parameter ranges are 75 to 150 of full scale for pos itive and negative full scale calibration points zero calibration steps have 50 of full scale for valid entry ranges However for optimum calibration it is recommended that you use cali bration points within the ranges listed in Table 2 6 and Table 2 7 Note that each sense range requires three parameters zero negative full scale and positive full scale Similarly each source range requires four parameters two zero parameters a positive full scale parameter and a neg ative full scale parameter 2 16 Calibration Table 2 6 Recommended CALibration PROTected SENse parameter ranges Sense First parameter Second parameter Third parameter range zero negative full scale positive full scale 0 2V 0 002 to 0 002 0 18 to 0 22 0 18 to 0 22 2V 0 02 to 0 02 1 8 to 2 2 1 8 to
143. ltage will clamp limit at 1 Range compliance can occur when the compliance setting is higher than the possible read ing of the selected measurement range When in compliance the source output clamps at the maximum measurement range reading not the compliance value For example if the compli ance voltage is set to 1V and the measurement range is 200mV the output voltage will clamp limit at 210mV 1 8 Performance Verification Maximum compliance values The maximum compliance values for the measurement ranges are summarized in Table 1 2 Table 1 2 Maximum compliance values Measurement Maximum range compliance value 200mV 210mV 2V 2 1V 20V 21V 60V 63V 10uA 10 5 1004 105 1mA 1 05mA 10mA 10 5mA 100mA 105mA 1 1 05 3 15 When the SourceMeter goes into compliance the Cmpl label or the units label 1 for the compliance display will flash Determining compliance limit The relationships to determine which compliance is in effect are summarized as follows They assume that the measurement function is the same as the compliance function Compliance Setting Measurement Range Real Compliance Measurement Range Compliance Setting Range Compliance You can determine the compliance that is in effect by comparing the displayed compliance setting to the present measurement range If the compliance setting is lower than the maximum possible readin
144. m Abort if ESC is pressed Check for cal step completion Request SRO status Input SRQ status byte Clear OPC Clear SRQ Wait for operation complete C 5 C 6 Calibration Programs INPUT 2 5 RETURN rrCheck Error check routine NT 41 OUTPUT 24 SYST ERR Query error queue NT 1 ENTER 24 NPUT 42 E Err F E lt gt 0 THEN PRINT Err GOTO EndProg Display error ReadDMM Get reading from DMM SLEEP 5 PRINT 1 ENTER 22 INPUT 2 Reading IF J 2 AND Range 3 THEN Reading STRS VAL Reading OneOhm RETURN EndProg Close files end program BEEP PRINT Calibration aborted PRINT 1 OUTPUT 24 CAL PROT LOCK PRINT 1 OUTPUT 24 RST PRINT 1 LOCAL 22 24 CLOSE END VoltsInit Calibration command lists DATA RST SOUR FUNC VOLT SENS CURR PROT 0 1 DATA SENS CURR RANG 0 1 SOUR VOLT PROT LEV MAX SYST RSEN OFF DATA CAL PROT CODE KI002420 OUTP STAT ON VoltsCal DATA SOUR VOLT RANG SOUR VOLT DATA CAL PROT SOUR CAL PROT SENS SOUR VOLT 0 0 DATA CAL PROT SOUR CAL PROT SENS SOUR VOLT CAL PROT SOUR DATA CAL PROT SENS SOUR VOLT 0 0 CAL PROT SOUR CurrentInit DATA SOUR FUNC CURR SENS VOLT PROT 20 SENS VOLT RANG 20 DATA OUTP STAT ON CurrentCal DATA SOUR CURR RANG SOUR CURR CAL PROT SOUR DATA CAL PROT SENS SOUR CURR 0 0 CAL PROT S
145. mains connections Assume all measurement control and data I O connections 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 ANSI states that a shock hazard exists when voltage levels greater than 30V RMS 42 4 peak or 60VDC are present good safety practice is to expect that hazardous voltage is present 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
146. mended that the Front Panel Tests be performed prior to any disassembly The disassembly instruc tions for the Model 2420 are contained in Section 5 of this manual Do not make repairs to surface mount PC boards unless equipped and qualified to do so see previous CAUTION When working inside the unit and replacing parts be sure to adhere to the handling pre cautions and cleaning procedures explained in Section 5 Many CMOS devices are installed in the Model 2420 These static sensitive devices require special handling as explained in Section 5 Whenever a circuit board is removed or a component is replaced the Model 2420 must be recalibrated See Section 2 for details on calibrating the unit Power on self test During the power on sequence the Model 2420 will perform a checksum test on its and test its RAM If one of these tests fails the instrument will lock up Troubleshooting 4 3 Front panel tests There are three front panel tests one to test the functionality of the front panel keys and two to test the display In the event of a test failure refer to Display board checks for details on trou bleshooting the display board KEYS test The KEYS test lets you check the functionality of each front panel key Perform the following steps to run the KEYS test 1 Display the MAIN MENU by pressing the MENU key 2 Select TEST and press ENTER to display the SELF TEST MENU 3 Select DISPLAY TESTS and press ENTER
147. n after calibrating the desired range s Routine M aintenance 3 2 Routine M aintenance Introduction The information in this section deals with routine type maintenance that can be performed by the operator Line fuse replacement WARNING Disconnect the line cord at the rear panel and remove all test leads connect ed to the instrument front and rear before replacing the line fuse The power line fuse is accessible from the rear panel just above the AC power receptacle see Figure 3 1 Figure 3 1 Rear panel OR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY PE KEITHLEY a MADE IN 75V LINE FUSE PEAK PEAK PEAK SLOWBLOW 250V LINE RATING GUARD 90 250 50 60HZ LO 220VA MAX 4 WIRE INPUT SENSE OUTPUT BEAK ENTER IEEE ADDRE H FRONT PANEL MENU INTERLOCK DIGITAL I O JD Perform the following steps to replace the line fuse 1 Carefully grasp and squeeze together the locking tabs that secure the fuse carrier to the fuse holder 2 Pull out the fuse carrier and replace the fuse with the type specified in Table 3 1 CAUTION To prevent instrument damage use only the fuse type specified in Table 3 1 3 Re install the fuse carrier Routine M aintenace 3 3 NOTE Ifthe power line fuse continues to blow a circuit malfunction exists and must be corrected Refer to the troubleshooting section of this manual for
148. n to normal display 2 10 Calibration Table 2 3 Front panel voltage calibration Source range 0 2V 200 00mV mV 000 00mV mV 200 00mV mV 000 00mV mV 2V 2 0000V 0 0000V 2 0000V 0 0000V 20V 20 000V 00 000V 20 000V 00 000V 60V 60 000V 00 000V 60 000V 00 000V Multimeter voltage Source voltage reading lt lt lt lt 4444 lt lt lt lt Use EDIT and RANGE keys to select source range Multimeter reading used in corresponding calibration step See procedure Step 3 Current calibration Perform the steps below for each current range using Table 2 4 as a guide 1 Connect the Model 2420 to the digital multimeter as shown in Figure 2 2 Select the multimeter DC current measurement function Figure 2 2 to IA range current calibration test connections 0909900009 GS eue gt Model 2420 Input LO 4 Coo LLL C od DOS E3E3E5E3E3E3 Lc Amps Digital ultimeter 10 11 12 13 14 15 Calibration 2 11 From normal display press the SOURCE I key Press the EDIT key to select the source display field and then use the down RANGE key to select the 10 source range From normal display press MENU Select CAL and then press ENTER The unit will display the following CALIBRATION UNLOCK EXECUTE VIEW DATES p gt
149. nformation for the various circuits is summarized below Display board checks If the front panel display tests indicate that there is a problem on the display board use Table 4 1 See Principles of operation for display circuit theory Table 4 1 Display board checks Step Item component Required condition Remarks 1 Front panel test Verify that all segments operate Use front panel display test 2 J1033 5 5 Digital 5V supply 3 U902 pin 1 Goes low briefly on power up and Microcontroller RESET then goes high 4 U902 pin 43 4MHz square wave Controller 4MHz clock 5 U902 pin32 Pulse train every 1 ms Control from main processor 6 U902 pine 33 Brief pulse train when front panel key Key down data sent to main is pressed processor Power supply checks Troubleshooting 4 11 Power supply problems can be checked out using Table 4 2 See Principles of operation for circuit theory on the power supply Table 4 2 Power supply checks Step Item component Required condition Remarks 1 Line fuse Check continuity Remove to check 2 Line power Plugged into live receptacle Check for correct power up power on sequence 3 TP502 80V 10 Referenced to TP501 4 TP503 80V 10 Referenced to TP501 5 TP504 38V 10 Referenced to TP501 6 TP505 38V 10 Referenced to TP501 7 TP507 15V 5 15 referenced to TP500 8 TP508 15V 5 15VF referenced to TP500 9 TP510 5
150. ou to hazardous voltages which could cause personal injury or death if contacted Use standard safety pre cautions when working with hazardous voltages NOTE Ifthe instrument is still under warranty and its performance is outside specified limits con tact your Keithley representative or the factory to determine the correct course of action Verification test requirements Be sure that you perform the verification tests e Under the proper environmental conditions After the specified warm up period Using the correct line voltage Using the proper test equipment Using the specified output signals and reading limits Environmental conditions Conduct your performance verification procedures in a test environment with Anambient temperature of 18 28 65 82 F Arelative humidity of less than 70 unless otherwise noted Warm up period Allow the Model 2420 to warm up for at least one hour before conducting the verification procedures If the instrument has been subjected to temperature extremes those outside the ranges stated above allow additional time for the instrument s internal temperature to stabilize Typically al low 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 Performance Verification 1 3 Line power The Model 2420 requires a line voltage of
151. r up Model 2400 190VA Model 2410 210VA Model 2420 220VA Model 2425 2430 250VA Model 2440 240VA COOLING Model 2410 2420 2425 2430 2440 Forced air variable speed WARRANTY 1 year EMC Conforms to European Union Directive 89 336 EEC EN 61326 1 SAFETY Conforms to European Union Directive 73 23 EEC EN61010 1 VIBRATION MIL PRF 28800F Class 3 Random WARM UP 1 hour to rated accuracies DIMENSIONS 89mm high x 213mm wide x 370mm deep 3 in x 8 in x 14 6 in Bench Configuration with handle amp feet 104mm high x 238mm wide x 370mm deep 4 in x 9 in x 14 6 WEIGHT 3 21kg 7 08 Ibs Model 2425 2430 2440 4 1kg 9 0 Ibs ENVIRONMENT Operating 0 50 70 R H up to 35 C Derate 3 R H C 35 50 C Storage 25 to 65 ACCESSORIES SUPPLIED Model 1754 Universal Test Lead Kit User s Manual Service Manual LabVIEW and TestPoint Drivers Rev 5 17 01 Specifications A 5 Accuracy calculations The information below discusses how to calculate accuracy for both measurement and source functions Measurement accuracy Measurement accuracy is calculated as follows Accuracy of reading offset As an example of how to calculate the actual reading limits assume that you are measuring 10V on the 20V range You can compute the reading limit range from one year measure voltage accuracy specifications as follows Accuracy of reading offset 0 015
152. rce for 0A output using the SOUR CURR 0 0 command Note the multimeter reading Send the source and sense calibration commands using the multimeter reading for the parameter For example CAL PROT SOUR 1E 6 CAL PRO T SEN 5 1E 6 Set the source to the positive full range value using the SOUR CURR command For example for the 1mA range SOUR CURR 1E 3 Note and record the multimeter reading Send the source and sense commands using the multimeter reading as the param eter For example CAL PROT SOUR 1 03E 3 CAL PRO T SEN S 1 03E 3 Send the SOUR CURR 0 0 command to set the source current to 0A Note and record the multimeter reading Send the CAL PROT SOUR command using the multimeter reading as the com mand parameter For example CAL PRO T SO UR 1E 6 4 Connect the 1Q resistor and DMM to the Model 2420 INPUT OUPUT jacks as shown in Figure 2 3 Select the DMM DC volts function 5 Repeat step 3 for the range using the calculated current as follows I V R where V is the DMM voltage reading and is the characterized value of the 1Q resistor Table 2 10 Current calibration initialization commands Command Descripton SOUR FUNC CURR Select source current mode SENS VOLT PROT 20 Voltage limit when current source is active SENS VOLT RANG 20 Make sure 60V range is not active OUTP STAT ON Turn source on Calibration 2 21 Table 2 11 Current range calibration commands
153. require re seating in its socket ROMs may be reseated as follows 1 Turn off the power and disconnect the line cord and all other test leads and cables from the instrument 2 Remove the case cover as outlined in Section 5 Remove the analog board assembly as outlined in Section 5 4 Locate the two firmware ROMS 015 016 located on the digital board These are the only ICs installed in sockets Refer to the component layout drawing at the end of Section 6 for exact locations 5 Carefully push down on each ROM to make sure it is properly seated in its socket 2 CAUTION Be careful not to push down excessively you might crack the digital board 6 Connect line cord and turn on the power If the problem persists additional trouble shooting will be required 4 14 Troubleshooting Disassembly 5 2 Disassembly Introduction This section explains how to handle clean and disassemble the Model 2420 Disassembly drawings are located at the end of this section Handling and cleaning To avoid contaminating PC board traces with body oil or other foreign matter avoid touching the PC board traces while you are repairing the instrument Motherboard areas covered by the shield have high impedance devices or sensitive circuitry where contamination could cause de graded performance Handling PC boards Observe the following precautions when handling PC boards Wear cotton gloves Only handl
154. rocedures require accurate test equipment to measure precise DC voltages and currents Calibration can be performed either from the front panel or by sending SCPI calibration commands over the IEEE 488 bus or RS 232 port with the aid of a computer WARNING This information in this section is intended for qualified service personnel only Do not attempt these procedures unless you are qualified to do so Some of these procedures may expose you to hazardous voltages Environmental conditions Temperature and relative humidity Conduct the calibration procedures at an ambient temperature of 18 28 C 65 82 F with rel ative humidity of less than 70 unless otherwise noted Warm up period Allow the Model 2420 to warm up for at least one hour before performing calibration If the instrument has been subjected to temperature extremes those outside the ranges stated above allow additional time for the instrument s internal temperature to stabilize Typically allow one extra hour to stabilize a unit that is 109 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 2420 requires a line voltage of 90 to 250V at line frequency of 50 to 60Hz The instrument must be calibrated while operating from a line voltage within this range Calibration 2 3 Calibration consderations When performing the calibration procedures Make sur
155. rovals may be used if the rating and type are the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component Note that selected parts should be purchased only through Keithley Instruments to maintain 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 11 01 Table of Contents l Performance Verification Introduction et ett rer ett e 1 2 Verification test requirements iii 1 2 Environmental conditions essere 1 2 Warm Up period eici iriri eia aiba CUR ERREUR 1 2 1 3 Recommended test 1 3 resistor characterization sese 1 3 Verification 6
156. s are within 1 of the present range After adjusting the display value to agree with the DMM reading press ENTER The unit will then display the following V CAL Press ENTER to Output 200 00mV Press ENTER The Model 2420 will source 200mV and display the following DMM RDG 200 0000mV Use lt q A Y ENTER or EXIT Note and record the DMM reading and then adjust the Model 2420 display to agree with the DMM reading Again the maximum display adjustment is within 10 of the present range After adjusting the display value to agree with the DMM reading press ENTER and note that the instrument displays V CAL Press ENTER to Output 000 00mV Press ENTER The Model 2420 will source 0mV and simultaneously display the following DMM RDG 000 0000mV Use lt A V ENTER or EXIT Note and record the DMM reading and then adjust the display to agree with the DMM reading Once again the maximum adjustment is within 1 of the present range After adjusting the display to agree with the DMM reading press ENTER to complete calibration of the present range Press EXIT to return to normal display and then select the 2V source range Repeat steps 2 through 18 for the 2V range After calibrating the 2V range repeat the entire procedure for the 20V and 60V ranges using Table 2 3 as a guide Be sure to select the appropriate source range with the EDIT and RANGE keys before calibrating each range Press EXIT as necessary to retur
157. shows an overall block diagram of the Model 2420 Circuitry may be divided into three general areas Analog circuits includes sourcing circuits such as the DACs clamps output stage and feedback circuits as well as measurement circuits such as the A D converter Digital circuits includes the microcomputer that controls the analog section front panel and GPIB and RS 232 ports as well as associated interfacing circuits e Power supplies converts the AC line voltage into DC voltages that supply the power for the digital and analog circuits and the output stage Analog circuits Figure 4 2 shows the analog circuitry block Troubleshooting 4 5 Figure 4 1 gu Analog Section Overall block LM ayes eat diagram Output DACs Clamps Stage O Output Feedback I Guard Y Buffer mE Guard i AID onverter To Analog To To drei CORI NIS NUM ETE 1 Circuits OutputStage Digital Circuits i 15 45V 442V 485V 5V 12V 1 1 Display Front i T 2087 le Panel 85 232 n RS 232 1 0
158. source and sense range being calibrated For example for the 2V range the following command would be sent SOUR VOLT RANG 2 Program the source to output the negative full range value using the SOUR VOLT command For example SSOUR VOLT 2 Note and record the multimeter reading Use the multimeter reading as the parameter for the CAL PROT SOUR and CAL PROT SENS commands For example a typical value for the 2V range would be CAL PROT SOUR 1 998 CAL PRO T SEN S 1 998 Program the voltage source for OV output using the SOUR VOLT 0 0 command Note the multimeter reading Send the source and sense calibration commands using the multimeter reading for the parameter For example CAL PROT SOUR 1E 3 CAL PRO T SEN S 1E 3 Set the source to the positive full range value using the SOUR VOLT command For example SOUR VOLT 2 2 18 Calibration Note and record the multimeter reading Sendthe source and sense commands using the multimeter reading as the parameter For example CAL PROT SOUR 1 997 CAL PRO T SEN S 1 997 Send the SOUR VOLT 0 0 command to set the source voltage to OV Note and record the multimeter reading Sendthe CAL PROT SOUR command using the multimeter reading as the command parameter For example CAL PROT SOUR 1 02E 3 Table 2 8 Voltage calibration initialization commands Command Description RST Restore GPIB defaults SOUR FUNC VOLT Activate voltage source SENS CURR PROT
159. spective companies THLEY Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 440 248 0400 Fax 440 248 6168 1 888 KEITHLEY 534 8453 www keithley com BELGIUM Keithley Instruments B V Bergensesteenweg 709 B 1600 Sint Pieters Leeuw 02 363 00 40 Fax 02 363 00 64 CHINA Keithley Instruments China Yuan Chen Xin Building Room 705 12 Yumin Road Dewai Madian Beijing 100029 8610 6202 2886 Fax 8610 6202 2892 FRANCE Keithley Instruments Sarl 3 all e des Garays 91127 Palaiseau C dex 01 64 53 20 20 Fax 01 60 11 77 26 GERMANY Keithley Instruments GmbH Landsberger Strasse 65 D 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Keithley Instruments Ltd The Minster 58 Portman Road Reading Berkshire RG30 1EA 0118 9 57 56 66 Fax 0118 9 59 64 69 INDIA Keithley Instruments GmbH Flat 2B WILLOCRISSA 14 Rest House Crescent Bangalore 560 001 91 80 509 1320 21 Fax 91 80 509 1322 ITALY Keithley Instruments s r l Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 KOREA Keithley Instruments Korea 2FL URI Building 2 14 Yangjae Dong Seocho Gu Seoul 137 130 82 2 574 7778 Fax 82 2 574 7838 NETHERLANDS Keithley Instruments B V Postbus 559 NL 4200 AN Gorinchem 0183 635333 Fax 0183 630821 SWITZERLAND Keithley Instruments SA Kriesbachstrasse 4 8600 D bendorf 01 821 94 44 Fax 01 820 30 81 TAIWAN Keithley Instrumen
160. ss 22 OPEN IEEE FOR OUTPUT AS 1 Open IEEE 488 output path OPEN IEEE FOR INPUT AS 2 Open IEEE 488 input path PRINT 1 INTERM CRLF Set input terminator PRINT OUTTERM LF Set output terminator PRINT REMOTE 22 24 Put 2420 3458A in remote PRINT CLEAR Send DCL PRINT 1 OUTPUT 24 CLS Initialize 2420 PRINT OUTPUT 24 ESE 1 SRE 32 Enable OPC and SRQ PRINT OUTPUT 22 PRESET NORM Initialize 3458A PRINT OUTPUT 22 NPLC 10 NDIG 7 TRIG LINE FUNC DCV AUTO OneOhm 1 Use characterized 1 ohm value CLS PRINT Model 2420 Calibration Program PRINT Connect DMM volts input to Model 2420 INPUT OUTPUT jacks GOSUB KeyCheck FOR J 1 2 Select volts current cal 9 1 THEN RESTORE VoltsInit ax 8 Range 2 Limit 60 ELSE RESTORE CurrentInit ax 4 Range 00001 Limit 3 PRINT 41 OUTPUT 24 OUTP STAT OFF PRINT 41 OUTPUT 22 FUNC DCI AUTO PRINT Connect DMM current input to 2420 INPUT OUTPUT jacks GOSUB KeyCheck END IF Source Range FOR 1 TO Max READ Cmd PRINT 1 OUTPUT 24 Cmd NEXT I WHILE Range Limit Cal all ranges IF 2 1 THEN RESTORE VoltsCal ELSE RESTORE CurrentCal FOR 1 TO 12 READ Cmd SELECT CASE I CASE 1 PRINT 1 OUTPUT 24 Cmd Range CASE 2 PRINT 41 OUTPUT 24 Cmd Source GOSUB ReadDMM CASE 3 4 6 7 9 10 12 PRINT 1 OUTPUT 24 Cmd Readin
161. te Example The LOCK command allows you to lock out comprehensive calibration af ter completing those procedures Thus LOCK performs the opposite of sending the password with the CODE command The LOCK query returns calibration lock status To unlock calibration send the CODE command with the appropriate pass word CAL PROT LOCK Lock out calibration CALibration PRO Tected SAVE Purpose Format Description Note Example DATE To save calibration constants in EEROM after the calibration procedure cal prot save The SAVE command stores internally calculated calibration constants de rived during comprehensive in EEROM EEROM is non volatile memory and calibration constants will be retained indefinitely once saved Generally SAVE is sent after all other calibration steps except for LOCK Calibration will be only temporary unless the SAVE command is sent to per manently store calibration constants Calibration data will not be saved if 1 calibration was not unlocked by sending the CODE command 2 invalid data exists for example cal step failed or was aborted or 3 an incomplete number of cal steps were performed for example omitting a negative full scale step CAL PROT SAVE Save calibration constants CALibration PRO Tected D ATE Purpose Format Parameters Query Response Description Note Example To program the calibration date cal prot date
162. the status byte with the STB query Refer to your controller s documentation for information on detecting and servicing SRQs B 12 Command Reference Calibration Programs C 2 Calibration Programs Introduction This appendix includes a calibration program written in BASIC to help you in calibrate the Model 2420 as well as an example program that demonstrates how to request calibration con stants Refer to Section 2 for more details on calibration procedures equipment and connec tions Appendix B covers calibration commands in detail Computer hardware requirements The following computer hardware is required to run the calibration programs BM PC compatible computer Keithley KPC 488 2 5 488 2 or KPC 488 2AT or CEC PC 488 IEEE 488 interface for the computer Two shielded IEEE 488 connecting cables Keithley Model 7007 Software requirements In order to use the calibration programs you will need the following computer software Microsoft QBasic supplied with MS DOS 5 0 or later MS DOS version 5 0 or later Universal Language Driver supplied with Keithley and interface cards listed above Calibration equipment The following calibration equipment is required Hewlett Packard HP3458A Digital Multimeter 10 0 1 100W resistor See Section 2 for detailed equipment specifications General program instructions 1 With the power of
163. then press ENTER The unit will display the following CALIBRATIO N UNLOCK EXECUTE VIEW DATES 2 Select VIEW DATES and then press ENTER The Model 2420 will display the next and last calibration dates and the calibration count as in the following example NEXT CAL 02 15 98 Last calibration 02 15 97 Count 0001 Calibration errors The Model 2420 checks for errors after each calibration step minimizing the possibility that improper calibration may occur due to operator error Front panel error reporting If an error is detected during comprehensive calibration the instrument will display an appro priate error message see Appendix B The unit will then prompt you to repeat the calibration step that caused the error Remote error reporting You can detect errors while in remote by testing the state of EAV Error Available bit bit 2 in the status byte Use the STB query to request the status byte Query the instrument for the type of error by using the appropriate SYST ERR query The Model 2420 will respond with the error number and a text message describing the nature of the error See Appendix B for details Front panel calibration The front panel calibration procedure described below calibrates all ranges of both the current and voltage source and measure functions Note that each range is separately calibrated by re peating the entire procedure for each range Step 1 Prepare the Model 2420 for calibration 1 Turn on
164. tion Repeat steps 2 through 18 for the 3A range using Table 2 4 as a guide When entering the DMM reading use the calculated current as follows I V R where V is the DMM voltage reading and is the characterized value of the 10 resistor 10 Resistor Model 2420 Input HI Input LO Digital M ultimeter Calibration Table 2 4 Front panel current calibration Source range Source current Multimeter current reading 10uA 10 000 pA 00 000HA 10 0001A 00 0004 100uA 100 00 000 00HA uA 100 004 A uA 000 004 A uA 1mA 1 0000mA mA 0 0000mA mA 1 0000mA mA 0 0000mA mA 10mA 10 000mA mA 00 000mA mA 10 000mA mA 00 000mA mA 100mA 100 00mA mA 000 00mA mA 100 00mA mA 000 00mA mA 1A 1 0000A A 0 0000A A 1 0000A A 0 0000A A 3A 3 0000A A 0 0000A A 3 0000A A 0 0000A A Use EDIT and RANGE keys to select source range Multimeter reading used in corresponding calibration step See procedure Current calculated as follows I V R where V is the DMM reading and R is the characterized value of the 1Q resistor Step 4 Enter calibration dates and save calibration NOTE For temporary calibration without saving new calibration constants proceed to Step 5 Lock out calibration 1 From normal display press MEN
165. ts Taiwan 1FL 85 Po Ai Street Hsinchu Taiwan R O C 886 3 572 9077 Fax 886 3 572 9031 Copyright 2000 Keithley Instruments Inc No 2193 Printed in the U S A 2 2000
166. ts function Set the Model 2420 to both source and measure current by pressing the SOURCE I and MEAS I keys and make sure the source output is turned on Verify measurement current accuracy for the 3A range as follows Select the 3A source range Set the Model 2420 source output to the correct 3A value as measured by the digital multimeter Note the DMM voltage reading and then calculate the current from the voltage reading and characterized 1Q resistance value as I V R where V is the DMM voltage reading and R is the characterized resistance value Verify that the Model 2420 current reading is within the 3A limits given in the Table 1 6 It may not be possible to set the current source to the specified 3A value Use the clos est possible setting and modify reading limits accordingly Repeat the procedure for a negative 3A current Repeat the procedure using the rear panel INPUT OUTPUT jacks Be sure to select the rear panel jacks with the front panel TERMINALS key NOTE Test currents above 105mA cannot be maintained longer than 1 minute without affecting accuracy See derating information in Note 1 under Table 1 5 Table 1 6 Current measurement accuracy limits Model 2420 source Source curent Model 2420 current reading limits 1 and measure range year 18 28 10 000001A 9 9966 to 10 00341A 100uA 100 000HA 99 969 to 100 03 ImA 1 00000mA 0 99967 to 1 00033mA 10mA 10 0000mA 9 9959 to 10 0041mA 100mA
167. ut to the nominal resistance or closest available value It may not be possible to set the resistance calibrator to the specified value Use the closest possible setting and modify reading limits accordingly Select the appropriate ohms measurement range with the RANGE keys Verify that the Model 2420 resistance reading is within the limits given in the table Repeat the entire procedure using the rear panel INPUT OUTPUT and 4 WIRE SENSE jacks Be sure to select the rear panel jacks with the front panel TERMINALS key Table 1 7 Ohms measurement accuracy limits Model 2420 range Calibrator resistance Model 2420 resistance reading limits 1 year 18 28 20 200 2000 2kO 20kQ 200kQ 2MQ 20MQ 1 90 190 1900 1 9kQ 19kQ 190kQ 1 9MQ 19MQ 1 89649 to 1 903510 18 9784 to 19 0216 189 824 to 190 176 1 89845 to 1 90155kQ 18 9850 to 19 0150kQ 189 847 to 190 153 1 89861 to 1 90139MQ 18 9517 to 19 0483MQ Nominal resistance value Reading limits based on Model 2420 normal accuracy specifications and nominal resistance values If actual resistance values differ from nominal values shown recalculate reading limits using actual calibrator resistance values and Model 2420 normal accuracy specifications See Verification limits earlier in this section for details Calibration 2 2 Calibration Introduction Use the procedures in this section to calibrate the Model 2420 These p
168. word by remote 2 6 Changing the password from the front panel 2 6 CHAR SET test 4 4 Command reference B 1 Command summary B 2 Compliance considerations 1 7 Compliance limits 1 7 Component layouts 6 2 Computer hardware requirements C 2 Current measurement accuracy 1 13 Detecting calibration errors B 8 Detecting calibration step completion B 10 Determining compliance limit 1 8 Digital board removal 5 5 Digital circuitry 4 8 Digital circuitry checks 4 11 Disassembly 5 1 Display board checks 4 10 Display board circuit theory 4 9 DISPLAY PATTERNS test 4 3 Environmental conditions 1 2 2 2 Error summary B 8 Example limits calculation 1 4 Factory service 6 2 Front panel calibration 2 7 Front panel disassembly 5 6 Front panel error reporting 2 7 Front panel tests 4 3 General Information 1 1 General program instructions C 2 Generating an SRQ on calibration complete 11 Generating an SRQ on error B 9 Handling and cleaning 5 2 Handling PC boards 5 2 Instrument re assembly 5 7 KEYS test 4 3 Line fuse replacement 3 2 Line power 1 3 2 2 Maximum compliance values 1 8 Measurement accuracy A 10 Miscellaneous commands B 3 No comm link error 4 13 Ordering information 6 2 Output current accuracy 1 11 Output stage 4 7 Output voltage accuracy 1 9 Overall block diagram 4 4 Parts lists 6 2 Performing the verification procedures 1 5 Power on self test 4 2 Power module removal 5 6 Power supply 4
169. y field and then use the down RANGE key to select the 200mV source range 4 From normal display press MENU 5 Select CAL and then press ENTER The unit will display the following CALIBRATION UNLOCK EXECUTE VIEW DATES p gt lt SAVE LO CK CHANGE PASSWO RD 6 Select EXECUTE and then press ENTER The instrument will display the following message V CAL Press ENTER to Output 200 00mV 10 11 12 13 14 15 16 17 18 19 20 21 Calibration 2 9 Press ENTER The Model 2420 will source 200mV and simultaneously display the fol lowing DMM RDG 200 0000mV Use 4 A V ENTER or EXIT Note and record the DMM reading and then adjust the Model 2420 display to agree exactly with the actual DMM reading Use the up and down arrow keys to select the digit value and use the left and right arrow keys to choose the digit position or use the num ber keys 0 9 Note that the display adjustment range is within 10 of the present range After adjusting the display to agree with the DMM reading press ENTER The instru ment will then display the following V CAL Press ENTER to Output 000 00mV Press ENTER The Model 2420 will source OmV and at the same time display the following DMM RDG 000 0000mV Use lt q A V ENTER or EXIT Note and record the DMM reading and then adjust the Model 2420 display to agree with the actual DMM reading Note that the display value adjustment limit
170. year month day year 1997 to 2096 month 1 to 12 day 1 to 31 cal prot date year month day The DATE command allows you to store the calibration date in instrument EEROM for future reference You can read back the date from the instrument by using the DATE query or by using the front panel CAL menu The year month and day parameters must be delimited by commas CAL PROT DATE 1997 11 20 Send cal date 11 20 97 Command Reference B 5 CALibration PRO Tected N D U E Purpose Format Parameters Query Response Description Note Example SEN SE To send the next calibration due date to the instrument cal prot ndue year month day year 1997 to 2096 month 1 to 12 day 1 to 31 cal prot ndue year month day The NDUE command allows you to store the date when calibration is next due in instrument memory You can read back the next due date by using the NDUE query or by using the front panel CAL menu The next due date parameters must be delimited by commas CAL PROT NDUE 1998 11 20 Send due date 11 20 98 CALibration PRO Tected SEN Se Purpose Format Parameters Description Note Example To calibrate the sense function cal prot sens lt nrf gt See Table B 2 for recommended parameter ranges for optimum calibration The CAL PROT SENS command calibrates the Model 2420 sense fun

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