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1. m CRESA 77D 5 or 1 1 657 CRESS 66 627222 cess Cae TEFLON INSULATION 26 3 x z SLT RND NYLON SCREW AND db 6 32 NYLON NUT SEHEM T StHEM ose RE part m part SAM ZONE part no 1 REAM part no 1 SENEM 1 i SELL Ll 7 304478 22 578 D 27 7 Keel 22 10 207 0251 3 2 i AE ZZ 159 99M Kot ZZ HO IZ yesi 22 4 Z 26 50 2251 3 32 25 6289 3966 cZ 16 97 59 TES 542 6 i 22 4524 2 72 10 222 0254 FB NOTES 5 778047 122 77 V B8 499 amp 3 Z 2655 3 DENOTES FACTORY SELECT VALUE 6 16 29 0 lt 4 1 22 222 73 288 92296 Kobe C9 _ 4635 882 ZZ SEE GWE NC 276998 7 08807 2225 EZ 43 44 24 osi 2 79 lex c3 HS 12 168 2257 7 8 CoS 142 82 802 27 Me _ 858 3 z 1 RA RET sm sa EO 9 NET E I 22 ENS Em 8 58 n49 27 22
2. iS FE aa i ii F OTE TTT 7 17 7 07 117 PART p 20 7 TTD 4 tt Jil Eg ee ee a re b TITI TT RARE amp w mne Hr 7 09 bg s q 9 1 x 208 SERS OL eo is 7 n 2 HID 43 5 338 4 7 5 338 4 2102 Titik 5 387 Yul DIET is a 17 75 90 Ne 325 2 STAKING 6 tome weni Figure 7 1 Mother Board 516 Component Location Drawing Dwg 30411 F 5 LJ 2 z Z23 5 feces yo __ 797 D 2 15 0 1 2 L6 PHIL PAN HD SURE W BR Ia z etr 4 3e PLB 3 4 5 6 lt 002 i 873 223 T 9 d Bu m ED SEE DETAIL 20 REQ D OK BLUE WIRE 05 20 0 NOT HEAT THE SHRINK 7UBING DETAIL A 17263 RELEASED d see E 18022 SEE PAGE 2 S 22 SECURE 521 WITH 103 B
3. 10M 10M 10M 10M 10M 10M 10M 10 EX MODEL 619 4 ELECTROMETER MODULE MODEL 6011 REAR PANEL INPUT lt INPUT CABLE TRIAX CONNECTION Figure 6 6 Range Calibration 20 SR 1010 CONFIGURATION FOR 19kQ RESISTOR 10k 10k 10k 619 ELECTROMETER MODULE REAR PANEL MODEL 6011 INPUT CABLE lt TRIAX CONNECTION Figure 6 7 Range Calibration 20 Possible sources of high value resistors are Dale Electronics Inc Columbus Nebraska Victoreen Cleveland Ohio K amp M Elec tronics West Springfield Massachusetts 2 Refer to Figure 6 9 for a schematic of the calibration fixture 6 16 CONSTRUCTION INFORMATION 1 To decrease settling time and to assure accurate calibra tion an internal guard is recommended see Figure 6 9 The guard must be isolated from the surrounding case 2 To further minimize inaccuracies current leakage paths to ground or guard must be minimized This requires the use of low leakage insulating materials such as Teflon for construction and the use of special cleans ing agents such as Freon to clean the components and insulators after construction 6 17 CALIBRATION of 1 960 SOURCE Connect the 19GQ source to a teraohmmeter A meter with acceptable accuracy is listed in Recommended Test Equip ment Table 6 2 Determine the value to within 1000 ppm
4. Bae de e Pf ao 6 19 Filter Cleaning eset metes SN ed a ates 7 1 7 2 7 3 7 4 7 5 SECTION 7 REPLACEABLE PARTS ese OL S carcere Paris a urbes n Ordering IBFOTffatiorr o quar p Paca px Sa ed sg BARA deceret cr pedi uet aont E Mace ao E Baw Schematic Diagrams and Component Location 5 T I LIST OF ILLUSTRATIONS Title Page Rear Panel za au PEDI PUPA EUM Su RRA Ra cs bie E 2 2 Model 619 Front Panel Functions 2 2 Common Input Current Range 3 09 4 9 33 9 3 6 aaa Fu w CY COOLE RU oU EO Rd 2 7 Model 6194 Electrometer Input 2 8 Charge MaasUre malt os macie Tr uence ve a M be 2 9 Logarithmic Current 1 EB WE 2 9 Non Decade Current Gain 2 10 TIMING iato aD nr C RP E Dt sol kamasaq a AC CERO RC ae
5. 7 59 Processor Schematic CPU 30519D 7 61 Isolator Schematic 30520D adierit Deed eh tina ta A ge ney 7 63 A D Converter Schematic 30521D 2 24 2 7 65 Electrometer Module Schematic 305220 222 7 67 Electrometer Module Schematic 30523D 7 69 Filter Mux Schematic 30524 7 71 6 2 SSNS N G vi LIST OF TABLES Title Page oic ow RC No Kette area V RE IE 2 3 External Feedback Measurements ss 4 44 Seis CY OR VER RERO us TE ea 2 b 9BIOCHOD iue ous PORA N UNA I A ea 2 10 Sacondaty AU cacao RO wom IN a0 a 8 eae Boe e ORT P a ka ioi eire a b OCA HOP tae dp dal o Rd 2 10 Function eos cce ER iA 2 11 dE IRE AL Ear RECS aud di rh a ep pou TP 2 11 Continuous Times Typical in Miliseconds 2 13 One Shot Times Typical in Milliseconds Trigger to First Byte Delay
6. 7 20 Filter Mux Board PC 521 Parts kx teme Ronde nm ERROR Pew ede 7 26 Fari Assembly Parts EISE 25 SOR Gm Lacu die De aaa su beeen 7 30 SECTION 1 GENERAL INFORMATION 1 1 INTRODUCTION The Keithley Model 619 is a fully programmable micro processor based Electrometer Multimeter broad measurement range is from 2nA with 100fA 103A reso lution on the most sensitive range to 2A The Model 619 ohms measurement range is from 2k 0 10 resolution to 2T The volts measurement range is from 200mV 14V reso lution to 200V The Model 619 is capable of 0 000596 resolution t can be interfaced to any programmable measurement system utilizing the IEEE 488 Interface bus See Figures 2 1 and 2 2 for front and rear panel detail 1 2 FEATURES The Model 619 includes the following features Resolution of 4 or 5 is standard with the Model 619 Resolution of 3 is available only when programmed through the IEEE 488 bus The IEEE 488 Interface option Model 6193 enables the Model 619 to be incorporated into a measurement system that utilizes programmed control through the 488 bus The modular construction concept allows for future developement of a line of interfaceable products Whenever two Model 6194 Electrometer Modules are in stalled there are two seperate input channels Channels A and B meas
7. 6 7 Informatioranda AssSUITIDUOf IS iode tatem cae chad xm REO Io nece S EO SUR Re lo o a CE E 6 7 1 Standara DO oe cg Ne NUES oA edis Eo cb et did qa ue a 6 8 Molti CS EUR uma t eet GR Bed Qu 6 9 AIDS sedat On e EDU Tp Eine Go mq Q PCR cfr pra d acne ae 6 10 m md RES UE TRG auc Vw VAR SURE RAW pe dioere s tumet 6 11 Environmental Conditions ox de te 6 12 Calibration curte fh ed tto a ELO See ls aen d Matera eta ca o S LN 6 13 Calibration Cover 6 14 Calibration e ento s vov IRR EO DE Rae TABLE OF CONTENTS CONT Paragraph Title 6 15 Calibra SR qq XA ie 6 16 Informa tioli l u u BaP ee EET Ea es tem te OU eee 6 17 Calibration of 1 9GO SOUT ECCE A XO ROC n RA d e ee ee 6 18 Treubl stootitp e uni Met dc ro a AE THOMAS A EAE ac I OR GC 6 18 1 Special Handling of Static Sensitive 6 18 2 Troubleshooting Procedure
8. epee i 4 TS 122 5 REV SER REO ET 22 ASCE Pas bi 06157 o MI ANALOS Bus J3 ee 48 ACK 1 ee 14 3 yi 4 013 gt 212 y amp Dl a DIO 2 4 i eo gt 43 gt 20 20 f 5 HIGHEST SCHEMATIC DESISNATICNS USED UZT LECO ABO 12 13 25 SCHEMATIC DESIGNATIONS NOT USED 24 14 31 Figure 7 15 Isolator Board 519 Schematic Diagram Dwg No 30520 7 63 7 64 D E 2506 59 6 8 V Leo ac ve jsf 8 CLR 12 4 GND 5505 EVENT COUNTERS QC 22 28 SE Zi 28 74444452 DI VV VV V NV VV VV VN V 222997228 I 585889588 V TRANSCONDUCTANCE FORM 285110 c D E CONTROL val J INTEGRATION TME COUNTER w RELEASED Genap ee ip l gt NO CONNECTION ALL RESISTGR
9. 8409 K405 043 Ras 40 wao E c exp NCT USED d l pu 0546 5 I x 15v C413 THESE ARE OPTIONAL COMPONENTS 2 me ND LAI KB NO CONNECTION 2413 I CLOVERLEAF TERMINAL o y 1 ppm ioe NOTES i v ALL RESISTOR VALUES ARE 17 18 Ie ye bea 21 2 24 22 4 26 27 25 OHMS UNLESS OTHERWISE MARKED ELO 4 5V ay aa Sv K XILOHMS M MEGOMS 6 2 ALL CAPACITOR VALUES IN V Y MICROFARADS UNLESS OTHERWISE pa MARKED pf PICOFARADS um FORM 285110 B D E F H Figure 7 18 Filter Board PC 521 Schematic Diagram Dwg No 30524 7 71 7 72 KEITHLEY SERVICE FORM Model Date Name Phone Company Address City List all control settings describe problem Attach additional sheets as necessary Show a block diagram of your measurement system 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 Frequency _ Ambient Temperature Variation Rel Humidity Any additional information If special modifications have been made by the
10. 2 14 Operating Function Format u u ew NON Cis ee a pu s amas ea 2 15 Data Terminators a ee rd Rs EL Nos vila CCS 2 16 Data Storage Buffer essc eia o SERPENS e E eun emi s obe Gta PERE VECES 2 16 Additional Trigger Time to First Byte Time sis Rohre hex her e rS SES RS 2 16 Reading Rate Modes ub roce SERE VE oi 2 17 PPO OCG rs Sct hace preach lint wn PA iE DAC 2 19 Data Coda 22 T Qui WARE qu 2 19 Byte RR ROV qu 2 20 DC Voltage Performace Ch ck Qa 4 2 DC Current Performance Check 4 ERA Xe reap eae fas a 4 2 Ohms Reference CHEE drei was pu EDS 4 2 Register Commands dnd ae ai CC pap BEES 5 6 Register neo rasper wea ee CROCO usur Mes eu 5 8 Jumpeis for PROM Selection cioe RE eh qe EI Od E vU dra adore ia E Rd dac bee PEL T o 5 9 Register Commands oii raro a P edi Ya ox d Se e E DA ee db RN e XC CEA OD LES
11. H RELEASED 7 5225 BIDS HDD NEED ee T T x K T j PART ND SEHER T IYEM PART gt Dess ZONE ITEM PART NO DAMM ZONE ITEM PART SEM zong 1 T35sa4G as 110 174 i vezor 1 To Fan BE L c e _ 1 BRACKET 3 ic zz O cs rae ag GS if _ 14 CHD E Z 230 BS 5 Pao UAR 1 6 C 3 O 1 FR P303 150 O 2325 FA Z 94 oo 73 4O8 ZEA pe m 8 hue Rtas coe Paice 2 Sa 82 mae e 74 C 9 21 0 3506 AY _ Mother 155 TENE TEN Rog DES 99 75 CS 249 2307 1 A4 3 09 5 ROS 07 54 A we 2 Km n Of C ss 71 Buty Ae VET n 4 m 4 4 5 22 LU I C AH i lt 79 64 571 Lo 88 fe 1 S8 Mind i y i i 59 22 nd 1272 Vesa 2 2 sc E 2 3s H in peo 50026 at Ss NOTE ly 4 RBS
12. 20 50 495 520 48 52 7 52 2 GE 93 52 8 DF oath LN zx La m 196 5 435 _ S GF 1 97 052 75 LA 28 gt SZB ZZ ER ith 57 91 41 LAS 5220 44 1 28 J 2 Su 425 5224 GZ 25 ym MUR EM EN r ME 5 _ _ 15 74 0207 22 LZ 2 26 0202 A2 31 ZZOE ZZ A 22 1518 024 3 UE 16 206 14 205 cB 16 749 23 7 207 28 gi E 0 14 F ITEM DOO PART Pis 227 MES 1 29 225 621 ite SNe ME LZZ ul FEN Se tee ALB 77 30150 84 40 _ DA 729 GOTH Y ic2 he A 1222 EE 26 IIE OMK x 4 4 Z D Figure 7 2 Display Board PC 514 Component Location Drawing Dwg No 32003 2 of 2 H 785 RELEASED je isis oy k i 2 4 6 sheet 7 35 7 36 D
13. p E 701 NOTES 1 ALL RESISTGR VALUES ARE IN OHMS UNLESS MARKED OTHERWISE KILGHMS M 2 ALL CAPACITGR VALUES ARE IN MICRCFARADS UNLESS MARKED OTHE RWISE pF PICC FAR ADS 8552 DENOTES POWER SUPPLY COMMON AND SIGNAL 10 14 4 12 2 Urs 50 R OIG UT 2 U707 0708 4 DENOTES TEST 7 DAY Figure 7 13 IEEE Digaram Dwg No 30518 25271 RELEASED CoD FROM Cn FROM To 22 11 amp Mz 20 eu TO 10 IEE BUS DIO D04 Bog m 3 DIOS 6106 15 0107 16 DOS 11 amp NDAC NRFD 21 GND 12 CHASSIS SHIELD IEEE BUS Interface PC 517 Schematic 7 59 7 60 20 EXT RESET o WATCHDOG PROCESSOR BUS 22 5 Trig 24 RESET 28 TRG 29 Al BE IS DI USOL Jeo5 902 903 909 0912 2912 37 36 U906 1907 WIS 0924 2 914 918 092 US 9 554 ai 555 42 45 Bb 44 46 4 BAZ Al ALDRISS Di Bas 49 gt 190 AP 02 23 aas 7 52 53 BAS 54 Bag 25 26
14. Calf Se 1 24 195 40 408 39 wae C2 67 2 27 409 98 6546 24 2 eB 76 47 12227 i188 v lt C2 TFS 47 72 94 E 169 72 04 0402 33 P ZO 26 47 403 2176 77 9404 72 76 77 0405 22 73 76 39 40 22 j 74 7 22 Jegor 122 1 2 27 7274 5425 175 Jt 32 22 4E te 76 39 1240244 22 42 anam Z422 ca 22 17 3 0410 25 2 57 10403 5 78 IZG 3 24 22 3 452 57 522 7G 12422 25 L 52 te 22 24 3 24 50 83 1 vom TE 4887 i 50 87 SOCKET PINs 82 28 40 82 STI on A FORM 285110 B Figure 7 9 Filter Mux Board PC 521 Component Location Drawing Dwg No 30352 7 51 7 52 _ H 27 ee TH H 109 106 JIO5 JIO3 I CON 2 2 1 2 2 2 2 796 uU MENS s c xx CERE ee oc 20 ec c _ Sa DI 5 os 2 0 DI gt D13 u E 33vAC Ou 0143 22 UNE 33VAC CH A LO SOO DO Y Bo tee Ge 6 4 Ean se eT a
15. eet o iW System Operation Using the Model 6193 IEEE 488 Interface Address Bus Management gt uius A ADR EIC Ba eeka aaa Ka Sy nt Bus Commands implemented ck osa Zo Gic ne Ra Input Channel Control Secondary Address is Data Format cirea Ve xxx ES e ea at bem s Doa uode ae GAY PR arto Cs dra g ASGIEFGITIBE eto sd EC dt Bilan Format oot eie Dos Ed At P Sut q ws pa CR PW a a ect PR ES Programmable Terminaltot oss uu ee e Qe e Buffer E EC eC ib Vete Aw Red M asur mat seo ado dde Reading Rate Modes vesir E Deor e edu onte deo i tegi Ab Ote pad ie BIB bove state E ES a W Sun asi at S a T adit Puya uoa n Sa UR es Zaro Chack ded Ud NC ROPA diee e ucc red e PES b is NC PERO Mate hace Baseline StOTB e b SEC doc ay ESP em LAC OS ee ac C Baseline S
16. 3600 ay 10QpF ss 100pF du sut du Choke 16V Cer 1000V Cer 16V CerD 16V CerD 16V CerD 16V CerD 1000V CerD 16V CerD 1000V CerD 16V CorD 16V CerD 50V CerF 50V Cerf 16V CerD N Channel J FET Transi stor Array NPN Transistor PNP Transistor PNP Transistor PNP Transistor Transi stor Array N Channel J FET NPN Transistor PNP Transistor Thick Thick 6 8M Film Film 10 1 44 Comp 520 15 520 A3 52 0 H5 520 H5 520 H5 520 F1 520 61 520 61 520 F2 520 1 520 5 520 5 520 5 520 H5 520 F1 520 86 520 4A 520 A3 520 A2 520 81 520 61 520 C1 520 61 520 86 520 82 520 Several 520 Several 520 85 Table 7 7 A D Converter PC 520 Parts List Circuit Schematic PC Board Mfr Mfr Desig Description Location Item No Location Code Desig 3 82 4 C2 5 E1 6 E2 7 F2 8 C3 9 03 10 C3 11 63 12 03 13 03 14 2 15 2 16 19 C3 21 B1 22 C2 23 C2 24 C2 25 02 26 82 27 02 28 53 29 3 30 1 33 62 34 C2 35 83 UK 16 104 5 MAL 3600pF UK16 104 UK16 104 UK16 104 UK16 104 00 101 UK16 104 DD 101 UK16 104 UK16 104 8121M050651104M 8121M050651104M UK16 104 SWD 100 11 4 392 29198A 2N3904 2N3638A 2N3638A 2N3638A 29198 ITE4392 2N3904 2N3638A TF 86 TF 85 CR25 Keithley Part No C 238 1 C 138 3600pF 6323857 6238
17. ON 5 6 1 Isolator Board Theory of ODGLatiolt use eoe Da De S MR gu 5 7 Display KOVDORFIE uu a sical eet us piq ani hy 5 7 1 Display Keyboard Theory of Operation 5 8 Board 3 s Z yt l DO UL tecti BON o E edat Sasa sa 5 8 1 A7D Thaotry of Operati n uu Oe eic durus c pe Lad eux 5 9 Filt r M ltiblex r BOSE rrenan Sete OS Reale s SECTION 6 MAINTENANCE 6 1 Introduction uo md v SNO UE IU a eam waa ew EUER AS pde ORO wR Sa 6 2 Up Pr gramming uv oot So PS EP VES er acta C EPA QU DOLCE RU RD C eM 6 2 1 Line Voltage and Frequency Selection 6 3 Beper Selection S EO AGE VARI E a u ki 5 6 4 Reading Rate S lection a cera u vacet e dr Cer v eeu ao una ces ps et rens MOS dene eg 6 5 Calibration IBtFOd HOTIOTI 2d eret s CIE T Ao q STULTE 6 6 Calibration Test Equipment and Conditions 6 6 1 Recommended Test Equipment and Related Infromation
18. E x LEE A CCM EWR AE NR QI ERES 29 P edv SUF FLY 0 6 K a 5v E x N N NN S VECES SE MIL N 2 TA s 5 a 2 e PwR T TELS SUPPLY E ps 27 B LM TP iv oco 0 m co gt 0 2 PU a mE hu i cg E qui oo COM CIMA 22 22 E cens 2995 BBA DMAGNT IMA 2 ma 5 2 CIMB3 IMC 2 OC 5 di SPARE S Y 6 IMA O ___ S ded ee sasa E 2 IMA OO O1MA8 IMB BOO OIMB9 IM 2 E C ru IMC SC C C ETME 9 n ox 5 i z IMA 7 zw A P IMBI OTB zv E On Melt 0 ZORESET Deor 0 0 SPARE 14412000 DIMA 13 IMBIBOT 5 IMB 13 Ineo T OL SIMI IAG o M 2 amp 62 62 1 2 62 Ea T SPARE 7 2722 442 SPARE PP T P heats CH A CH A CH B CH B FILTER A T ISO 20 04 i T a 21 BD ED C na Bol sz a
19. 122229 1 2222 2 2 221 46227 BF L ZZ o lt 2202 Z 632 lt 0 z FE __ 24 7 Z 22 E 2202 277 22222 c8 ZZ 6222 07 amp 5 22 22 i 25 E 242 47 2 22 le zs lt 3 76 je 520 amp T os 22 C604 2 7 224 EZ ES L ZZ _ 7 ic 729 027 COOS 22 22 124225 FF 3 ZZ lt 230 lt KGOB 47 LE i B 53 470 C606 EZ ELA _ ZZ 12 76 ROOF 187 Z 2 607 EZ E Z2 W 7e 470 Kt 28 LF zd 00 E 344 50 COB FF LER i 82 2 22 6860 Keli D3 7 5 1 16699 ZZ e B 7 2 22 42 SL 2 C e2 O EN AN EZ BB z37 QE 3 E AE ae EEB ziak BF ZZ ZI i Z EN 52 8 88 23 7 BF 22 4002 42 45 75 47 Kole BF 22 p 2 2 25 c8 62 ess 2 OK 22 7 BF za 52 MERE Z 7 RGI8 48 KK 28 AZ 16 881 RG 9 Z2 120202 7 ls 89 1 Ze T 22 28 24903 ZZ T EZ 2 4 38 264504 22 52 Z i 22 06205 ZZ ZZ 76 23 ce 221 23 ERECG ZZ s 7 05 2202 22 OF i 2 22 29 7 922 ROGOZ 2 TR 76 7807 2 25 z le eosB 22
20. asos m1 wn Q A u o o in Ww 797 r 5 a Epi ED e ITEM PART DESIG TOME ITEM PART NO DET IL TONE sinar ZONE 20 7517 46 011 B Al 6 8 l 50 16 173 _ 9815 C2 4 EA 22 9 198A4 502 50 62 16 44 Oso Dx lt 2 23 41 0505 25 TN 16 242 0517 EX 138 60 C502 _ 24 75 94 _ Q504 2 _ cA PH M 2 16 215 5 7258 1 C503 5 9 GsoS 2 65 16 2380 DS 5 999 ut 32 Se Lo Hs c sos 29519684 12 17 53 1 _ csoc 28 TG 717 Q508 48 215 155 uso 0 O9 4 8509 49 1 44 SOB Di 69 DZ 6D verso _ IO 7 2 BO 76 97 50 ca sO 10 155 o8504 E 4 IOOgF 5 9 NM nM _ i SA 1C 21 0505 Fr W i2 C 23 amp 1 32 52 26 216 B2 2SO DS 1338 B 25 16 11 78
21. ACER RICO Font e ERES CIE og FMT ERA 4 1 2 Environmental Conditlors ac u RN eq e 4 2 Model 619 Performance 4 2 1 inital Conditions er op re 4 2 2 Voltage EUR RARE xr Xu ve rd a e EINE s 4 2 3 Current VarIHeBtlOTi aon etu who EUER ad EX A ciere T nn pi EE QG Dee AQUIS Gin ate sou 4 2 4 Resistance Ode da P IN der a opt hae SECTION 5 THEORY OF OPERATION 5 1 Introduction e cesi ce eee an REOR en tees oleae tl s ud ae A hasa dp Beas 5 2 oa Fal A a e a C o DR verd ed 5 3 Model 6194 Electrometer Module oos ce rre Rer RI awe Maven pee ee eee xao ea 5 3 1 Theory of Operation for the Model 6194 Electrometer Module 5 4 Model 6193 IEEE 488 Interface 5 4 1 IEEE Interface Board Theory of Operation 5 5 CPU Board 22 RR sido ee HESS bx e wd 5 5 1 CPU Theory of Operations ok ceed e Bk Cer OR be ee ede he ate fe Elea 5 6 Isoldtor
22. c9906 22 2212 22 27 803 FB Z NU is 09 2 8 AE 9 997 ZZ A 77 1571 6 44937 42 E i EREE TAZ 724 i 727 261 22 790 LES ED _ D NES 2227 1 25 i A 22 0 5 USS FZ _ IB oo So 26 25 49 wz 7 4 50 84 P ar PA Ere 84 JEU 271097 3 TZ 50 08 4 REQ 20 i TPL LE 82 UB 8 In 5 49i s 389 4 TEE 2 82 4315 0932 29 Vea Be LEES T 2Z 27 0920 5 LM 5l i A 22 65 1 80 927 EF 1 91 78 2218 32 242494 775 GF OG 227 2222 42 220 m 2 78 7 7 CWT 292 52 2 702 TE ZE 21 1272797 5 EL 20 29 8 DF ES GR ENS 78 0 use F3 1221 Be ZE T 7 22 821 m 4281 dae TEM 29 99002 779 zz 22 m INOT WITH AX ROME 57 CB _ AE 125 939 3 221 s ra Be 12 4 CAN IS i 1 27 i _ 93_ 20 45 VET pe 1 ZA 28 2 7780 EE 6 ZG PF 22 122901 0272 LBS m i 22 2 s ZZ I 22 3 1923 SZ EA ZZ 22 28 8207 2 1 22 i EE 2_1 ENT 23 ET i i NOT USED 4905 Cz 36 34 DE j 6B 26 233 U9O4 5 1102 NOT USED PEL wel A FORM 28511D B D G H Figure 7 5 Pro
23. 59 gai 59 4 60 Bais MEN 7 aus 91 17 BBA DMAGNT 18 23 BR w 27 BIOEN 22 882 t GUARD 1 3 Em 5 R W Bt Z BVUA 1 HIGHEST SCHEMATIC DESIGNATIONS USED 2 924 po qp UNUSED GATES BY PASS CAPS C30 THRU C309 92 2913 C97 T ALL 1 ROM NOT USED JUNZERING 30 904 4908 w229 out IN IN our NOTES L ALL RESISTOR VALUES ARE IN OHMS JNLESS DRVENS MARKED OTHERWISE K KILOHMS M MEGOHMS 2 ALL CAPACITOR VALLES ARE MICROFARADS UNLESS MARKED OTHERWISE pF PICOFARADS DENOTES DIGITAL GROUND 4 kd DENOTES TEST POINT A f0eM 285110 B D E F G H Figure 7 14 Processor CPU Board PC 518 Schematic Diagram Dwg No 30519 7 61 7 62 _ PROCESSOR Bus 7 VASOL O cb u rm o E Es m wn CISPLAY CONN ie BA BIOEN BAR BAS ELECTROMETER COMPLETE 4 A FORM 285110 B
24. 7 7 e Ts 222 Sar era A FORM 285110 B D E F G H Figure 7 8 Electrometer Module Board 523 Component Location Drawing Dwg No 30391 7 49 7 50 D E F H LYR tco wo NO pave 71 22 KE ESSE rr 18 80 ID 7OO2 HGD ARTWORK was REV C la 82 12 17270 UPORED _ 1 o 26 25 2 3 16 milii 4 tnm ZONE PART NO PART RO 7 den l ZONE PART M quw HE PARDO T 02 85 12450124 18 22 2 8 2 EY 031 83 ZfEeSK Ok Z q2 0027 2229 8 0402 82 977 37 00 Eae 83 2245 S G7 ZC 76 14405 c3 s SZ e 76 206 2225 BB 3267521404 C E 406 83 i CEPA 05 22 24 2 4 7 407 72 2 257 55 25 9o 10 2109 C3 AB eee DIE E 4OE oe 6312 54 30 G2 9 C 219 407 EA BARE BUSS MEE i 555757 poss 2 92 Zz Z GS o2 22 242 1406804 2C 7 5 1 402 23 S3 57 2742 o 5 6 25
25. C4 2 ise C 237 4 22 1 22 152 i tes 8 2 2 2707 62 21 22 64 i 125 7 00 _ 80s 8 2 7 5 W i 2 2 2702 3 7 3 822 127 7 270 62035 E2 ed Dep 2 222 2204 Z amp 22 390 4 7e 39o0 40e 167 mcd 2 2 290 2 07 gt 2 23 477 E 32 7021 69 28 gt 472 22 83 22 290 2 09 201 232 473 2 24 6 70 620 7 c 239 474 G2 7 35 72 gt 23 j 87 74 PP FORM 285110 amp NUT 32 5 amp FHIL HE 2 OF ITEM REG D 8803 816 ATA 6 Le 17558 Figure 7 6 Isolator Board 519 Component Location Drawing Dwg No 32006 F 15 26 4 eo Ss 1 7 43 7 44 D E F G H o meveioN CRENTATION GSO 52084 j p cZ WE Fey 57 52 1 0501 0502 U502 1503 0504 0505 S s e 19 D 0503 9 n CONES v 050 9504 0506 0505 U508 0509 U5IO 5 507 Q 2 U5I3 U514 osos 0507 0515 N aD 0508 C U5I6 0517 0518 0519
26. We 2 110 079 100 EBE ORS ZZ 23 27 12 2 8 _ Kib BF ZZ 88 5 2 8 2 22 0 cee 49 7 08 257 22 85 2077 2 E MESES 7 4 Zeb 27 SO E KOLB DE Io 88 806 1 Kert 23 2 22 292 Vesli c3 CATI FP T LEA 27 KOLIE DB v BE SEE NOTE 2 E Z2e6 92 52 1 84 lt o 2 88 P ZZ 23 24 22 88 vE682 1 1237 0 0555 9 4 06 424 89 288 1658 KUTI 27 A E FP ZEE 14602 2 90 4208 Ze EE G5 AREE i 2 Z 7 5 46079 EZ ZEZ m 2 2 i 22 2 00 50 80 FZ 26 7 127 L 27 1227 00 129 204456 j Ot M m 228 76 47 0051 47 94 2096 9991 LER 22 250 E 52 i 725 2889 8 2662 _ ZZ 2880 20 px FZ 32 i oz 2 1 i 797 22 lt 485 22 2 ER 22 92 amp amp 7 lt 2060 GZ 22 29 0087 23 25 i 24 200 Kob JOO 19688 2 EM GS EZMEK KEDI 487 PEE ee Z2 oZ i 736 6 27 KOSS fos 1 22 1 2 477 272 G8 Kite 222 1 LPO 159 ZZ 7 52 22 405 Ll i 20 0129 9702 228 126 FPW 27 AZ T 459 ZZ 172 254 798
27. h Ss t IL TEMPORARILY MOUNT 78 175 TO BOARD WITH ETIN ML GEN ME NM RE Se ee pou ES 22 Z g LG PHIL HO SCREWS a 45 Ge U 155 Ju gt 85 sal j Kors x 42 7TR 175 Ts 15645 Tr Ines VP 2 SLE E Eu 1 i 44 m 50 c 188 1 Om izl l 1 ici R2 GA TWISTED 15 a 0 FROM J207 eS E E 3 GA TWISTED 795 185 Fan dean Screw NOTE 3 PR BLK Kee Naw Y FROM J2OG BLK BLUE JBOG MTD UNDER J3O7 4 4 G A2 gt LONG Pan Serew Ano KEP NUT NS TALL BETWEEN VRBO Ano 5 HEAT SNK 5 ZAAD Lona Tear caes Screw FA Ker Nut Roat 1 sz Lone Pan ScrRew 6 ERP Not 6 5 Eacan EQD s 59 4 40 Fig Lone 596 32 x Lona _ Ban ieS SCREW Paes Pan Heap 4 40 x Me Lows Ano Nut Screw AND EP PAN HEAD i Regt Tom Laced BRACKET FoR EACH BRACKET Screws 4 Feg c A FORM 285110 B D E F G H Figure 7 3 Power Supply Board PC 515 Component Loc
28. 5 12 Jumper 2 allows for odd parity checking or no parity checking depending on the system needs The regulated 5 is provided to the isolator digital side by VR801 and associated capacitors 5 7 DISPLAY KEYBOARD The display keyboard has three main areas the keyboard annunciators and numeric displays The keyboard area consists of a four by six matrix for a total of 24 switch loca tions Sixteen of these switches are used in the Model 619 to select range function and channel The annunciator area consists of 23 LED s The Model 619 uses 21 annun ciators to display the status of the instrument The display area consists of a signed 5 digit mantissa and a signed 2 digit exponent All the display board hardware decoding is done on the ISOLATOR PCB The decoding places the PCB at memory address 8100 82 U204 is located at 8100 and 9207 is located at 8200 82 The power for the display board is also derived from the Isolator board All signal and power lines are delivered to the display PCB via the connec tor cable 5 7 1 Display Keyboard Theory of Operation NOTE When reading through the theory of opera tion for the display keyboard it will be helpful to refer to Schematic Diagram 30515 The heart of the display board consists of U204 and U207 Motorola 6800 family peripheral interface adapter chips PIA s which are fully software programmable The PIA s internally consist of two program
29. 52 2 5 F502 2 _ 5 10 16 0508 BE AXE RM E EZ 236 6 28503 55 16 24 509 02 15 5 S54 499 R504 6 27 FSOS 5 25 136 2250 FZ 22 DO MK 1 REO _ 8 _ 28 10 230 us FS _ 18 239 456 amp 9 22 2507 59 lt 119 DAE B2 49 R508 C3 _ 80 MES 6 A FORN 2851 B G H Figure 7 7 A D Converter Board PC 520 Component Location Drawing Dwg No 30395 7 45 7 46 c D E F Q49 0 C s T CREIO B C60 4 ITEM part ITEM PART OSAM zone ITEM PART NO 20KE ITEM PARI oj Bees L i i H i 208882 Ae
30. ASCII Data String Execute This character terminates the command string and causes their execution Q n gt m gt T Z 2 18 The sequence of commands after the secondary address and prior to execute is unimportant except that Baseline Store cannot be in the same line as function or channel change 1585 error see SRQ status byte formats All commands are executed after X is given Only com mands that you wish to change need to be programmed 2 29 SRQ STATUS BYTE FORMAT If an invalid command is given no change in status will occur If in the M1 response mode service will be quested and the error will be indicated in the SRO byte Extensive error checking is done during programming of the Model 619 The errors can be classified into two types Pre Execute errors and Post Execute errors 1 Examples of Pre Execute errors VX IddC V2X IddC ggX IddC D Fggg IddC must see and X to accept next com string E FAX IddCO N Examples of Post Execute errors Do a 20 when not in Zero Check CO Status Byte see Figure 2 11 Error Codes 0106 1 error see Table 2 14 Data Codes D106 0 nonerror see Table 2 15 N oT RO 30 MACHINE STATUS Secondary Addresses c and d The Model 619 can be addressed to give its current machine status To get the current status of Channel A send Talk Address secondary address c To
31. CHASSIS ANALOG OUTPUT 2 Y 6194 ELECTROMETER Figure 2 7 Non Decade Current Gain Measurement Limitations on the value of R require it to be in the range of 1020 to 10190 Frequency compensation stabilization is accomplished by Selection of based an RC response time should be per Table 2 3 with a minimum value of 100pF TABLE 2 3 SELECTION RC Response Time 5Ousec 500 5msec C 100pF 10 to 10 105 to 106 106 to 107 107 to 1010 2 12 SYSTEM OPERATION Using the Model 6193 IEEE 488 Interface 2 13 ADDRESS SELECTION 1 Primary Address The Primary Address of the Model 619 is selected by 5 switches on the IEEE 488 module see Figure 2 1 These switches are accessible from the rear panel of the unit This allows the selection of 31 primary listener talker address pairs Binary 11111 is reserved for the Untalk and Unlisten commands 2 Secondary Address The Model 619 uses a secondary addressing to distinguish between SRQ requests com mands and data associated with input Channel A and in put Channel B To address the Model 619 the IEEE 488 controller must send the primary address of the Model 619 followed by the secondary address of the desired channel See Table 2 4 for secondary addresses 2 14 BUS MANAGEMENT LINES 1 Remote Enable REN To place the Model 619 into the remote mode send REN and the appropriate listen ad dress and the remote indicator will light The sta
32. Displayed exponents are multiples of three 0 3 6 12 15 18 The Resolu tion feature increases only the resolution of the displayed reading INPUT INPUT COMMON CHASSIS GROUND CONTROL S100 KEITHLEY CS 253 POMONA 3580 P100 KEITHLEY CS 141 2 9 10 Current Ranges Common Input Whenver a common input is required which would include the 2 Amp range the following triax adapter may be utiliz ed in this instance a single input is used and an external relay connects the 2 Amp current range shunt to the triax in put connector on the Model 6194 Electrometer Module See Figure 2 3 A 5 Volt control signal external to the Model 619 Elec trometer Multimeter must be supplied to switch the relay to the 2 Amp current range Any additional leakage current introduced by the relay can be nulled using the BASELINE STORE BASELINE SUPPRESS feature WARNING Care should be exercised in shielding the input from any extraneous pickup Additonally if high common mode voltage is required the entire circuit should be shielded by the chassis ground to prevent a potential shock hazard 2 10 EXTERNAL FEEDBACK USE The external feedback current range provides a varied and extensive additional measurement capability to the Model 619 Electrometer Multimeter Among these are charge logarithmic currents and non decade current gains 6194 2 AMP INPUT SPECIALTY CONNECTOR CO 30 100 1 RY100 KEITHLEY RL 51 5
33. UPRANSE A 7 1 1 1 0 2 5209 620 5211 sede BSLNE UNUSED GATES 7 5 02 G H D ja j L 17 22 REVISED BEEPER LS2ODCIRCUIT 280 D REVISED PER CIRCUIT REVISION 58 82 DIFF 5 Pa 1 M gt 25221 05215 ky o 2 3 4 CRAT B 22 5 1l 4 Teu ee 1203 9205 8 HIGHEST SCHEMATIC SCHEMATIC DESIGNATIONS DESIGNATIONS USED WOT USED sor I pre cw ee pg Lec dw c qu 6 Figure 7 11 Display Board PC 514 Schematic Diagram Dwg No 30515 7 b5 7 56 5304 ON w o p J303r v AE EA 1 77 BLUE o 5303 ON OFF UP o DOWN BLK AG 1 0 250 0 5 RED 30 5302 GRN WHT A FORM 29518 B C D E F 4305 90 110 105 125 I lt 180 250 210 250 L lt 3 EDEN MNONCS 4 CR303 VR302 IN OUT lt 8 iSV il 309 C307 1 306 2505 11 5 ORN 620 3 ANALOG 4 COMMON BUS 2 7 j E 305 1 304 SR3os 4 7K WHT SLK lt 5 es TD s 10 ct IN OUT lt 90 180
34. 19 65 19 65 519 65 519 5 519 4 519 3 519 65 519 65 519 E2 519 81 519 46 519 46 519 46 519 6 519 A 519 04 519 Schematic PC Board Location Item No Location 3 B2 4 82 5 2 6 2 8 82 9 2 10 3 11 2 12 2 13 2 14 2 15 2 16 2 18 2 19 2 20 F2 21 C3 79 02 80 02 81 02 82 02 23 62 25 81 26 2 Desig 8121 M050 651 104M 8121 050 651 104 8121 050 651 104M 8121 M050 651 104M 8121 M050 651 104M 8121 M050 651 104M TSD3 10 336 1287 TAD F010 F200 8121 050 651 104 8121 M050 651 104M 8121 M050 651 104M 8121 050 551 104 UK 16 104 UK16 104 UK 16 104 TSD3 10 336 PCMI287 8121 M050 651 104M UK 16 104 8121 M050 651 104M 18914 18914 18914 18914 3429 2002 430 8R101 223 CR25 Keithley Part No C 237 1 C 237 1 C 237 1 C 237 1 C 237 1 C 237 1 C 314 10 C 314 22 C 237 1 C 237 1 C 237 1 C 237 1 C 238 1 C 238 1 C 238 1 C 314 22 C 237 1 C 238 1 C 237 1 RF 28 RF 28 RF 28 RF 28 CS 322 267 TF 100 R 76 2 70 7 15 Table 7 6 Isolator Board PC 519 Parts List Cont EE mz mig Desig Description Location Item No Location Code Desig Part No 270 5 1 4W Comp 519 E2 CR25 R 76 2 70 270 5 1 4W Comp 519 E4 CR25 R 76 2 70 390 5 1
35. 20ms 100ms co co oc chp Same as Byte 14 cha 50 60 7 60Hz chB Buffer State 1 Buffer no readings Q Buffer 10 readings Q Buffer 20 readings 0 Buffer 30 readings Q Q Q Buffer 40 readings Buffer 50 readings Baseline Store No Store Store Readinq N1 Same as Byte 11 Auto Ranqo chA f Non Autorange Autoranqa Same as chA Byte 13 Terminator ch chB Byt che IL Y DEL Y CR Y LF Same as chA 15 No Readings to Ave Same as chA 2 21 2 22 SECTION 3 ACCESSORIES 3 1 INTRODUCTION Section 3 lists the optional modules and accessories available for installation in or use with the Model 619 Electrometer Multimeter 3 2 MODEL 6191 GUARDED ADAPTER The Model 6191 Adapter is an outboard option for use with the Model 6194 Electrometer Module It reduces effective cable capacity by driving the inner shield of triaxial cable at guard potential and thereby reduces time constants due to high source resistances when measuring volts and ohms By reducing the additional effective cable capacitance to approximately 2pF it permits measurements from high im pedance sources See Figure 3 1 The Adapter OUTPUT connects directly to the Model 6194 Electrometer Module INPUT shielded connector Guard potential is obtained from the Model 6194 Analog Output The Adapter
36. 7 26 904 92 E Z lt 2609 47 76 42 9205 BF _277 ERGO lez 74 842 1 77 281 amp 4 1 EZ ZZ 74 42 0 2 22 ZZ 22 2608 23 HS 1 2 A z 12218 42 les 242 26 38 2 1 24 r37 BE T CORNER 2 1187 Z 22 628 8075 7 27 LOZ _ 7 24270 BF GE SOB ZZ 20277 BF 2 d 444127 770 7 0607 AZ Z FORM 285110 D E F H Leu CE _ e 2 9 z z 2 ADDED 8 E Ae C GD SIS5S s7EM EEE SY WAS 572380 ARTWORK FROM REV BTOC ADDED TEM 12 Loos 722 REV C O 4 40 X 525 PAN HD SCREW 2 REQ O AND 40 KEP 2 Figure 7 8 Electrometer Module Board PC 522 Component Location Drawing Dwg No 30387 7 47 7 48 u ARTWORK wAS REV 2 Y M D E F 6 feco emo DATE 016508 n l p ES 29 5 DELETED ITEM RIC O52 ed Z CHG D ARTWORK wAS REV 2 26 32 x 1 4 PAN HD SCREW 2 56 X PAN 42 SCREW 1 AND 6 32 KEP NUT 2 INTERNAL TOOTH LOCKWASAER SCREW MOUNTS FROM OPPOSITE SIDE 9 2
37. Component Location Drawing Dwg No 30329 7 39 7 40 D G H 050025 Lov Ma C ITEMS FROM LOI TOLST 2 7 ITEMS 72279 FROM 1I TO Hr PRO 1S He 77 FROM LSL HG TO LSL 2 BOoZ2 TEMS S284 87 FROM 51 92 TO S ITEM scie 8 i 115 __ w90 5 07 C uoo 1903 8 7 1905 1906 0 Z T u 58 308 T909 pee PE D pike 8 4 EXT RESET 3 3 w909 M N amp 22 X A FAN HD SCREW 4187 AND 46 32 NUT a Mrs VITRE NEM PART SCHE ZONE PARI NO UM PART NO SEM ROWE Me M _ SS gt 0 i 25 22 125727 USOS 22 28 WOT BZ Log ns lo eeowe 90 2 JF W908 BB 8 287 9O 422 22 242494 27 RESET 2 USED 0907 105 NOT USED 909 47 4 12922 ZZ 7 75 280 1908 2 426 5 c908 22 2 7B 0909 27 1 7 2224 EP 21 Wea 2207 Z 2 066 UHO 472 _ Zooo CIOS 2 4 72 44 2902 AB xac vi 8
38. Location Code Desig Part No 4 5 1 4w Comp 521 64 32 83 BRN CR25 R 76 4 7k 13 7k 1 1 84 Film 521 C3 35 C2 1 8 1 T 1 R 88 13 7k 1 10W Mtf 521 03 36 C2 29996 521 03 37 C3 29996 Cermet Pot 521 04 35 C2 BRN 3006P RP 89 100k 150k 1 1 8W Film 521 04 39 C DLE CMF 1 10 1 T 1 R 88 150k 634k 14 1 8W Mtf 521 E3 40 2 DLE 1 10 R 88 634k Thick Film 521 03 4 41 C2 CAD TF 84 Cermet Pot 521 03 42 C2 BRN RP 89 100 OPTIONAL 521 02 43 643k 12 1 8W Mtf 521 E3 44 02 CMF 634K 1 10 R 88 634k IK 1 1 8W Mtf 521 F3 45 C3 CMF 1 10 1K R 88 1k 9 09 1 1 8W Mtf 521 F 46 C3 CMF 1 10 9 09K R 88 9 09k 10k 1 1 80 Mtf 521 62 147 03 1 10 10 R 88 10k 634k 1 1 8W 521 D2 49 4 E 1 10 634K R 88 634k 499k 1 1 8W 521 C1 51 D2 1 10 R 88 499k 909k 1 1 8W MtF 521 02 52 03 CMF 1 10 909K R 88 909k 47k 5 1 4W Comp 53 03 CR25 R 76 4 7k Thick Film 52 1 Severa 54 03 TF 102 1 l 5k 1 1 8W MtF 521 F5 55 03 DMF 1 10 R 88 1 5k 3 48k 1 1 8W 521 65 56 03 1 10 R88 3 48k 10k 5 1 4M Comp 521 85 57 E3 CR25 R 76 10k 10k 15 1 8W MtF 521 C2 58 F3 CMF 1 10 R 88 10k 10 1 4W Comp 521 83 59 F3 CR25 R 76 10k 7 27 Table 7 9 Filter Board PC 521 Parts List Cont Desig Description Location Item No Location Code Desig Part No 8433 30 18 1 1 2W 521
39. Sdto j 125 250 vR30I m lt 9 o 470 12 J304 6 7 lt 9 5 8 UNREG 4 C302 C303 R302 i 1600 1600 22 e she cee 2 DIGITAL 2 gt COMMON BUS a ut 10 N C lt lt l 12 4506 ELECTROMETER COMPLET EXT TRIG J307 C D E F G H zone NO oare a 16 aseo ess E Oo ee A GCS 4 2 NOTES 3 ALL RESISTOR VALUES ARE IN OHMS UNLESS MARKED OTHERWISE K KILOHMS 2 ALL CAPACITOR VALUES ARE IN MICROFARADS 3 7 DENOTES CHASSIS CONNECTION DENOTES FRONT PANEL CONTROL 5 DENOTES INTERNAL CONTROL 6 DENOTES REAR PANEL LOCATION 4 HIGHEST SCHEMATIC DESIGNATIONS USED C313 J307 304 SCHEMATIC DESIGNATIONS NOT USED 2301 5 6 H Figure 7 12 Power Supply Schematic Diagram Dwg No 30516 7 57 7 58 081606 _ 5v 37 BDI 02 35 Bos 42 06 45 w 44 Bap 46 BAI BA2 48 27 2 35 BAIL 57 12 58 10 33 b FORM 9C BUS 285116 TF3 705 50 IC K R7CIA D IOK R7CIC R OID SCHEMATIC DESIGNATIONS NOT USED ejn c i iym CCE 1 N A puse
40. The Model 6011 is a four foot 1 meter low noise triax cable terminated with alligator clips at one end and a triax connector at the other end This is a supplied accessory with the Model 6194 Electrometer Module See Figure 3 8 Figure 3 6 Model 6011 Triax Input Cable 3 3 3 4 SECTION 4 PERFORMANCE VERIFICATION 4 1 INTRODUCTION Performance verification is recommended upon receipt of the instrument to ensure that no damage or misadjustment has occurred during transit Verification may also be per formed whenever the instrument s accuracy is questioned or following calibration NOTE For instruments that are still under warranty less than 12 months since date of shipment and whose performance falls outside specifications at any point contact your Keithley representative or the factory immediately 4 1 1 Required Test Equipment The accuracy of the test equipment should be at least five times better than the instrument specifications The minimum required accuracy ratings of the voltage current and resistance sources are as follows 1 Voltage sources A 190mV to 1 9V 00296 B 19V to 190V 00396 2 Current sources A 1 9nA to 19nA 0796 B 190nA to 1 9A 0396 3 Resistance sources A 1 9kQ to 19 04 190kQ to 1 9 0396 C 19 190 1 9GQ 0796 D 1900 296 E 19060 8 F 1 5T0 2 If the accuracy of the test equipment is not at least five times better than
41. This must be done at a temperature of 23 C 1 C SHIELDED TEST FIXTURE ea ere ANALOG OUT gt GUARD CONNECTION 619 Once the value of the 1900 source has been established it may be used for calibration for a limited time The stability specifications of the resistors used will determine the length of time the 1960 source can be used After this time the ex act value of the 1 9GQ source must again be determined The teraohmmeter be used to re establish the value 6 18 TROUBLESHOOTING The troubleshooting information in this section is intended for use by qualified personnel who have a basic understand ing of the analog and digital circuitry used in a precision test instrument instructions have been written to assist in isolating the defective circuit Isolating the defective com ponent has been left to the troubleshooter NOTE For instruments that are still under warranty less than 12 months since date of shipment whose performance is outside of specifications at any point contact your Keithley representative or the factory before attempting troubleshooting or repair other than battery or fuse replacement 6 18 1 Special Handling of Static Sensitive Devices CMOS devices are designed to function at high impedance levels Normal static charge can destroy these devices Table 6 3 lists all the static sensitive devices for the Model 619 Steps 1 through 7 provide instruction on how to avoid
42. damaging these devices TRIAX CABLE MODEL 619 ELECTROMETER MODULE REAR PANEL INPUT Figure 6 8 Range Calibration 2060 6 9 AU N OC Ui Table 6 3 Static Sensitive Devices Reference Designation U202 U204 U207 U807 Keithley Part Number IC 141 LSI 28 LSI 27 PRO 114 PRO 115 151 26 151 15 0905 0906 0907 0915 0924 0913 9919 0920 1922 0923 Devices should be handled and transported protective containers antistatic tubes or conductive foam Use a properly grounded work bench and a grounding wriststrap Handle device by the body only PCB s must be grounded to bench while inserting devices Use antistatic solder suckers Use grounded tip soldering irons After devices are soldered or inserted into sockets they are protected and normal handling can resume Construction notes 6 18 2 Troubleshooting Procedure 1 General Procedure A Turn the Model 619 ON B Observe the proper indication on the display a Initially the display is blank and the beeper sounds for approximately two seconds b Display shoes line frequency and level of the software e g F60 C 1 c The Model 619 ends up in the default conditions e g Volts Channel A Zero Check C Visually inspect all PC Boards to verify that they are properly seated in the connectors Power Supply Checks A J305 pins 1 2 3 4 referenced to analog common has 33VAC 596 B J305 pin 8 refer
43. luF SOV Cerf 518 5 8 2 8121 050 C 237 1 651 104 luF 50V Cerf 518 85 9 B2 8121 M050 C 237 1 651 104M 50V Cer F 518 85 10 2 I 8121 M050 C 237 1 651 104M 50V CerF 518 85 11 82 8121 M050 C 237 1 651 104M 22pF 1000V 518 02 12 02 838 000 U230 C 64 22pF 220K 22 1000 CerD 518 02 13 02 a 838 000 U250 C 64 22pF 220K luF 50V CerF 518 02 14 F2 8121 M050 C 237 651 104M 50V CerF 518 05 15 43 8121 M050 C 237 1 651 104M eluF 16V CerD 518 02 16 B3 UK16 104 C 238 1 OluF 16V CerD 518 E2 17 83 UK16 103 C 238 01 1 16V CerD 518 E2 18 83 UK 16 104 C 238 1 luF 50V Cerf 518 C5 19 03 8121 M050 C 237 1 651 104M 22uF 25V Alum 518 A5 20 03 022 F200 C 314 22 50V CerF 518 C5 21 E3 8121 M050 C 237 1 651 104M luf 50V Cerf 518 C5 22 E3 8121 050 2297551 651 104 luf SOV 518 5 23 3 8121 M050 C 237 1 651 104M 7 12 Table 7 5 CPU Board PC 518 Parts List Cont Circuit Schematic Desig Description Location PC Board luF 50V CerF IOyF 25V Alum luf 50V Cerf Diode Silicon Thick Film 52 1 40 Comp 5 1 4W Comp Buffer Line Driver Dual 4 Input Nand Dual 4 Input Nand Triple 3 Input Nor Microprocessor with clock PROM PROM Ruffer Line Driver Hex Inverter Triple 3 Input Nand Hex 3 State Buffer Quad 2 Input Nand Programmable Module Timer Decod
44. 1 60 F3 MFF 1 2T 130 1K R 94 30 1k 8434 100k 1 1 20 MtF 521 A3 61 F4 MFF 1 2 1 100K R 94 100k 1435 10k 5 1 4W Comp 521 81 62 63 CR25 R 76 10k R436 30 1k 1 1 20 MtF 521 B1 63 63 MFF1 2 T 1 30 1K R 94 30 1k R437 100k 1 1 M 521 M 64 63 MFF1 2 T 1 100K R 94 100k 0401 NPN 70 92 case 521 G3 68 83 243904 TG 47 0402 NPN 0 92 case 521 64 69 83 283906 76 84 0403 NPN 0 92 case 52l1 F2 70 C3 2N3904 TG 47 0404 N Channel FET 521 F3 71763 392 TG 77 0405 N Channel FET 521 F2 72 C3 ITE4392 TG 77 0406 N Channel FET 521 D2 73 02 5301 139 0407 N Channel FET 521 E1 74 02 PF5301 TG 139 0408 H Channel FET 521 E3 75 02 PF5301 TG 139 0409 N Channel FET L E2 76 02 5301 TG 139 0410 N Channel FET 521 82 77 03 5301 TG 139 0411 N Channel 521 E3 78 03 PF5301 TG 139 0412 N Channel FET 521 E1 79 03 PF5301 TG 139 0413 NPN TO 92 case 521 85 80 E3 2N3904 TG 47 1401 OP 8 pin DIP 521 03 85 82 LF351N IC 176 0402 Voltage Reference 521 03 86 C2 LM399 IC 217 0403 8 DIP 521 87 53 LF351N IC 176 1404 70 99 case 521 F1 88 2 LF356H IC 218 u405 OP AMP 8 DIP 521 02 89 02 LF351 IC 176 Manufacturers Designation includes Parts Description e g CR25 LOOK 1 1 29 MtF R437 Values selected at factory to match U402 7 28 Table 7 9 Filter Board PC 521 Parts List Cont Circuit Schematic PC Board Mfr Mfr Keithley Desig Description Loca
45. 3 A s aes Woe ee EE o 1 I I I e GUARD s T COM 70 0 A FORM 285112 B C D E F Figure 7 10 Mother Board Schematic Diagram Dwg No 30517 7 53 7 54 061606 tav EY 2ASS CAP S C20 THR C292 C205 ALL Ot 12 4 8 z 22 a DO 45 DI C PBI 22 fE pz 282 23 155 50 D3 popred 633 04 14 e 04 05 3 05 285 De 12 D 7 ADDRESS gt 87 l gt 22 LI i PORT A lt RESET 1 Di l p PORT B lt D4 l 5 PRS i De PEG I D ADDRESS PB7 8200 R W AE 351559 PA i 5 s i OR 22 15 PORT 250 3 ce RESET PAS 25 52 7 234 cez 2 gt SE CONNECTION NOTES 1 ALL RESISTOR VALUES ARE OHMS UNLESS MARKED OTHERWISE K KILOHMS M MEGOHMS 2 ALL CAPACITOR VALUES SRE IN MICROFARADS UNLESS MARKED OTHERWISE pf PICOFARADS 3 DENOTES B COMMON A FORM 285118 B 5 R207 23206 4 F5G IP32 1283 R201 i v AJTO VOLTS 5 0 9 IPAC 202 8 pe zoom zu E O p i poe ce IPA 5205 5206 5207 i AMPS
46. 33886 1 205 RP 111 2M R655 5k 10 1 2M 523 84 67 02 BRA 3386H 1 502 RP 111 5k R656 5k 10 1 2M 523 65 58 02 BRN 3386H 1 103 RP 111 10k R657 50 10 1 2W 523 C2 69 02 BRN 3386H 1 500 RP 111 50 R658 97 6 1 1 2W MtF 523 32 70 62 DLE CMF 1 4 R 169 97 6 R659 10k 1 Wv 523 12 71 62 TEE 24117 R 221 10k R660 12 1 44 MtF 523 03 ACI R 264 998k R661 55 1 4 Com 523 33 3 C2 CR25 76 4 R662 5 1 4M Met 0X 523 13 R 269 99M R663 9 80 2 1 57 Epoxy Coated 523 84 75 C 289 9 86 R664 10 1 1 84 MtF 523 84 76 03 MFF 1 L W R 88 10k R665 499k 1 1 8W Mtt 523 85 77 83 MFF 1 10 R 88 499k R666 90 9k 1 1 3 523 C4 8 C3 CMF 1 10 R 88 90 9k R667 10k 5 1 44 Comp 523 C4 79 04 CR25 R 76 10k R668 1M 15 1 8W MtF 523 85 30 83 MFF 1 8 R 88 1M R669 10k 5 1 4W Comp 523 C4 31 63 CR25 R 76 10k R6 70 402 1 1 10M MtF 523 C2 82 02 R 263 402 R671 6 49k 1 1 8W MtF 523 02 83 03 1 10 R 88 6 49k R672 Selected 1 1 8M MtF 523 C 84 03 R 88 R673 2 15k 1 1 10 523 C2 85 03 Metal Film 1 10 R 263 2 15k R674 806 1 1 8W MtF 523 02 86 03 1 10 R 88 806 R675 10k 1 1 8W MtF 523 C3 87 03 1 8 R 88 10k R676 10k 1 1 8W 523 C3 88 03 1 8 R 88 10k R677 3 65 1 1 8W MtF 523 02 89 03 CMF 1 8 R 88 3 65 R678 lk 5 1 4W Comp 523 A1 90 E2 CR25 R 76 1k 7 24 Table 7 8 Electrometer Module PC 523 a
47. 44 Comp 519 01 CR25 R 76 390 390 5 1 4W Comp 519 4 CR25 R 76 390 390 5 1 4W Comp 519 CR25 R 76 390 10k 5 1 4W Comp 519 F 1 CR25 R 76 10k 390 5 1 4W Comp 519 2 CR25 R 76 390 5 1 4W Comp 519 1 CR25 R 76 2 70 Switch 519 03 39 81 765804 Hex Inverter 519 SEV 43 2 741504 Decoder Multiplexer 519 A5 44 02 3 SN 74LS139 Buffer Line Driver 519 A4 45 A2 7415244 Triple 3 Input Nand 519 SEV 46 82 741 510 Quad Receivers 519 A2 4 7 02 8726 Quad Bus Receivers 519 A3 48 2 8126 Versatile Interface Adapter 519 0 49 C2 SYP 6522 Shift Register 519 02 50 2 SN74LS164 Quad 2 Input Nand 519 St V 51 C2 SN7400N Quad 2 Input Nor 519 SEV 52 02 741502 Odd Even Parity Generator 519 F3 53 02 7415280 Checker Shift Register 519 F3 54 02 SN74LS164 Quad 2 Input Nand 519 SEV 55 2 SN 7400N Odd Even Parity Generator 519 F4 56 E2 7415280 Checker Shift Register 519 F2 57 2 SN74LS164 8 Bit Parallel Serial Conv 519 F1 58 F2 7415165 Manufacturers Designation includes parts description e g CR25 390 1 1 44 Comp for 8810 Circuit Schematic Mfr Mfr Desig Description Location Item No Location Code Desig Opto Coupler Opto Coupler Opto Coupler Opto Coupler 5 Volt Regulator Table 7 6 isolator Board PC 519 Parts List Cont 519 5 519 4 519 E3 519 1 519 02 HCPL 2601 CCPL 2601 HCPL 2601 HCPL 2601 SH323SC Keithley Part No
48. 470 16 8P HC 48 250 25 8p HC 48 250 25 8P DGA 5 510 OlmF 20 500V 150 5 106 047 250 20 TAP F 35V 207 47mmf SX 5000PF SX 47mmf SX 20mmf SX TAP F 35V 20 TAP F 35V 204 5 045 510 Olm 20 500V 5 GAS S10 28 500V TAP F 35V 20 TAP F 35V 207 Mfr Mfr Keithley Code Desig Part No C 312 10 C 312 10 C 240 4 7 C 240 4 7 C 178 0 1 C 313 470 C 313 470 C 314 250 C 314 250 C 22 01 C 138 150p C 178 047 C 179 10 C 138 47p C 138 5000p C 138 47p C 138 10p C 179 10 4170 10 C 22 01 C 22 01 C 179 10 C 179 10 Circuit Schematic Desig Description Location C665 C666 C667 C668 CR601 CR602 CR603 CR 604 605 CR606 CR607 CR608 CR6098 CR610 CR612 CR613 CR614 CR615 CR616 CR617 CR618 CR619 CR620 CR621 CR622 CR623 CR624 CR625 CR652 Table 7 8 Electrometer Module PC 523 and PC 522 Parts List Cont 50V Cerf DOlyuF OO pF O01 pF Diede Silicon Rectifier Diode Silicon Rectifier Rectifier Rectifier Rectifier Rectifier Rectifier Rectifier Rectifier Rectifier Rectifier Rectifier Diode Silicon Diode Silicon Diode Silicon Diode Silicon Diode Silicon Diode Silicon Diode Silicon Diode Silicon Diode Silicon Rectifier Rectifier Diode Silicon 523 C4 523 65 523 65 523 65 522 03 522 C2 522 F2 522 03 522 03 522 F3 522 F3 522 C2 522 C3 962763 5
49. 50 at maximum input current should be used At l max of 1004A this would correspond to 0 2 Note that at 100nA this would increase the RC response time constant to 5 sec at 1nA A minimum capacitance of 100pF is recommended Although the input to this configuration is a current source a voltage source can be used with a suitable ballast resistor In this configuration the input burden of 1mV must be con sidered as an error source against the input voltage Further processing of the response can be accomplished with Baseline Suppression and Ratio Baseline Suppression provides an offset and Ratio provides a scaling factor with optional Channel B Model 6194 Electrometer Module in stalled Alternately a controller computer can process the data via the 488 bus output with optional Model 6193 IEEE Interface installed 1 ZERO CHECK J TO A D CURRENT INPUT Loy ICHASSISI 6194 ELECTROMETER ANALOG OUTPUT gt Figure 2 6 Logarithmic Current Measurement 2 11 NON DECADE CURRENT GAINS The Model 6194 Electrometer uses internal decade resistance feedback networks for the 2nA through 20mA current ranges some applications a non decade current to voltage conversion gain may be desirable As illustrated in Figure 2 7 a calibratable resistance R serves this pur pose 2 9 HI TO A D CONVERTER CURRENT INPUT LO
50. 514 E5 84 62 5 54 435 Switch Pushbutton 514 C5 85 02 54 435 Switch Pushbutton 514 5 88 G2 SW 435 Switch Pushbutton 514 05 90 E3 SW 435 Switch Pushbutton 514 E5 91 F3 SCH SW 435 Switch Pushbutton 514 E5 92 63 54 435 Switch Pushbutton 514 C5 93 D3 SW 435 Switch Pushbutton 514 5 96 63 54 435 Switch Pushbutton 514 C6 97 D3 SW 435 Switch Pushbutton 514 D6 98 E3 54 435 Switch Pushbutton 514 06 99 SW 435 Switch Pushbutton 514 6 100 04 SW 435 Table 7 2 Display Board PC 514 Parts List Cont Circuit Schematic PC Board Mfr Mfr Keithley Desig Description Location Item No Location Code Desig Part No 5224 Switch Pushbutton 514 66 04 64 HOP 54 435 1201 Seqment Digit Driver 514 5I V 111 0 75492 16 141 1202 Hex Inverter 514 64 112 12 4049 C 106 1203 Seqnent Digit Driver 513 C 3 113 83 75402 206 1204 PIA 511 47 114 83 0682 1 LSI 8 1205 Segment Diqit Driver 115 63 79492 16 206 1206 Segment Driver 214702 1160 03 492 1 169 1207 PEA 514 744 117 93 MD ACA TP 151 8 7 1 Table 7 3 Power Supply PC 515 Parts List 500V CerD 11600uF 25V Alum Elect 11600uF 25V Alum Elect IQuF 20V Tant lOuF 20V Tant 10 20V Tant 10 20V Tant 620uF 35V Electrolytic 6201 35V Electrolytic 6800uF 25V Alum Elect OLF 20V Tant lOuF 20V Tant 3 Wire Line Cord Rectifier Bridge Rectifier Rectifier Slow Blow 250V 1A 3AG Sl
51. 5303 and S304 F301 and 5303 are located on the rear panel of the power supply Switch S304 mounted on the instrument front panel is connected to the power supply through R303 The AC power is also applied to the trans former T301 through switches S301 and S302 These switches permit transformer operation in four AC line voltage ranges refer to Table 5 1 The vent fan is powered from the transformer primary through connector P302 T301 acts as an autotransformer setting the voltage level to the fan Address 8 Data Out Control 8 Digital Bus Data In Acknowledge 8 lines 1tine i x Power Bus Rear Panel Analog Rear Panel Outpu Analog Output Analog Elect Elect to Filter Digital Mux Module Module Converter B Rear Panel Inputs Analog Bus 12 lines Model 619 Biock Diagram 5 1 The transformer secondaries grouped to provide power to the Model 619 digital and analog buses The digital por tion which provides 9 5V unregulated consists of bridge rectifier CR301 filter capacitors C302 and C303 bleeder resistor R302 and a network consisting of R301 and C301 The R301 and C301 network makes digital common electrically equal to power line chassis ground The unregulated DC voltage developed is connected to the mother board digital bus J304 5301 HILO LO 90 110 180 220V HIGH 105 125 210 250V1 5302 110 220V Figure 5 2 Power
52. Continuous Time Typical in Milliseconds TO T2 and T4 Figure 2 9 Start of Signal Integrate from Trigger 1 Trigger is a negative going pulse Table 2 8 One Shot Times Typical in Milliseconds tr Ag Tov sj v 8 18 28 40 32 75 87 322142 305 320 730 720 1540 6200 AN Y ATH to SRO 2 13 2 Byte 1 Refer to Figure 2 10 A Sign Bit 1 negative 0 positive B Overflow Bit 1 overflow C Data bits Most significant 6 bits of absolute value binary data 3 Byte 2 3 16 bit binary data 4 Byte 4 2 s complement binary representation of decimal exponent 5 Binary Format is not available in Only mode 6 Binary Format is not defined for secondary channels c and d NOTE Bus Line E01 is asserted during transmission of the last byte Dummy byte 2 18 PROGRAMMABLE TERMINATOR 1 The Model 619 utilizes the ASCII Code for terminating data transfer see Table 2 10 The Model 619 is program med with a CR LF terminator that is designated as Y LF when sent over the bus 2 However a different terminator can be programmed into the Model 619 Example To use A as a terminator pro gram Y A to be sent over the bus Reserved letters are not usable as terminators 3 No terminator is used if a Y DEL is sent over the bus The EOI will identify the last byte of the data transfer 4 On power up of the instrument the default condition puts the
53. D board consists of the basic hybrid charge balance dual slope A D There are no references or multiplexed in puts The control of this board is from the CPU board through the digital Isolator board The input voltage is converted into a current in the GAMP Transconductance Amplifier When the output of the In tegrator ramps up to the threshold of the D flip flop the 2mA current source is turned on until the output of the In tegrator ramps down below the threshold of the D flip flop The number of pulses produced is accumulated in the Event Counter Upon completion of Signal Integrate and based on the length of time determined by the number loaded into the In tegration Time Counter the number in the Event Counter is multiplexed into the processor The Event Counter is cleared and the Single Slope current source is switched on The time required to ramp to zero is measured by counting the clock in the Event Counter This number is also multiplexed into the processor From these two numbers the total number of counts can be calculated 5 8 1 A D Theory of Operation NOTE When reading through the theory of opera tion for the A D board refer to Schematic Diagram 30521 The Transconductance Amplifier performs two functions 1 Converts the input signal voltage to a current for the integrator 2 provides an offset to make the A D bipolar That is plus and minus voltage for input to the A D The
54. If the Model 619 is on while changing the switch position the new frequency setting will not be accepted until the instrument is turned off and then powered back on 6 3 BEEPER SELECTION The beeper is programmed to be operational at the factory however it can be disabled if so desired 1 Remove the top cover WARNING To prevent a shock hazard remove the line cord and all test leads from the in strument before removing the top cover Table 6 1 Line Voltage Selection 5301 5302 HI LO 110 220V Line Voltage Switch Type Keithley P N 90V 110V 3AG SLO BLO 250V 1A SLO BLO 250V 1A 3AG SLO BLO 250V 1 2A 3AG SLO BLO 250V 1 2A 105V 125V 180V 220V 210V 250V 2 Set switch 1 of S801 on the Isolator Board to the open position 1 refer to Figure 6 1 3 Reinstall the top cover 6 4 READING RATE SELECTION When the Model 619 is in the Front Panel Mode and the 5 7 digit resolution mode two different reading rates can be chosen via S5 2 41 rdg sec or S8 0 30 rdg sec See Table 2 6 To select the S5 reading rate 1 Remove the top cover WARNING To prevent a shock hazard remove the line cord and all test leads from the in strument before removing the top cover 2 Set switch 2 Figure 6 1 on the isolator Board to the closed position 0 3 Reinstall the top cover To select the S8 reading rate 1 Remove the top cover WARNING To prevent a shock hazard remove the l
55. Model 619 back into the CR LF terminator mode 2 19 BUFFER READINGS Same for both Channels A and B Data Storage Buffer commands for buffer contents are shown in Table 2 11 Q ASCII The ASCII byte contains ASCII number from 0 to 5 This number will allow 1 50 readings to be stored going in groups of 10 readings 1 1 says that T equals 10 readings i e Q1 says that equals 10 readings Table 2 9 Operating Function Format FUNCTION Volts Amps Ohms Ratio Difference NDCA 1 23456E 1 23456E 09 Terminators NRAT 1 23456 NDIF 1 23456E 09 Terminators NDVC 1 23456E 09 Terminators 0 9 Terminators 0 9 Terminators Availble in Talk Only operation only N Normal Reading 0 Overflow Reading 22 Bit Absolute Value Binary Data Decimal Exponent 0 1 42 Two s Compliment Format EOI Asserted MS Bit 1st Byte 2nd Byte Binary Point 3rd Byte 4th Byte Figure 2 10 Binary Format 2 14 2 Default is 5 or equals 1 reading i e Table 2 11 Data Storage Buffer Commands says that equals 1 reading 3 To empty the buffer read readings or reprogram i e give an X COMMAND FUNCTION 4 Data storage buffer must be filled up to the programmed BUFFER NO READINGS length multiple of 10 up to 50 before any data is BUFFER 10 READINGS transmitted on t
56. N N N N N N INO N N N N gt n G N NA NNN NN 2 22 NN NN 9 2 25 2 26 2 27 2 28 2 29 2 30 SECTION 1 GENERAL INFORMATION Introductio ivo o os a e ae a dA Rap we e at Features vm M acre EAE S Warranty IntormaltloD RO GR aed ee uawan Maru Addenda tabe kuyu hu een rar Pune Xs Safoty Sumbols and Tar Ju u lu Cue a aa ce rca o Mae GA ce a ECL CA Specifications DOCET PIPER Tr elie Soak PEE SECTION 2 OPERATION IntrOdbti D uu ase pain wewe Preparation f r MEA Ta yeu ale ae as eee Mr pu to Up Programming eo outer Sa S ID IP ERE RAD ERR aM deba s ge mE drea ae P a pay Only Mode Addressable Mode Selection Reading Hate SOIBCUON T bx a Y SIUE
57. SUSAN ta a o OA 2 12 Start of Signal Integrate From Trigger t1 Trigger is a Negative Going Pulse 2 13 Binary ronal 520 a tob et ee Aes MON LU PORE Ael DR 2 15 Stats BIO uoces h Sa eee ute Tar date 2 19 Status 2635 mace sexu mew EXER ELE CP Wed ideae au y uo ea 2 19 Model 6191 Guarded Adapter i i pro be m eed ch HER RE 3 1 Modal 6193 IEEE Standard 488 Output ii viene hiss ce ee rade eke AER e CERCA 3 1 Model 8194 Electrometer Modul vende de bok he uae OR AN RE A M CER SE Y e b nomm 3 2 Model 6195 Maintenance nd LER Vr ete eb aai 3 2 Model 6199 Rack Mounting Kit with Chassis 5 0 3 3 Model 6011 Triax Input Cable EXEAT RR HEEL 008 earannan 3 3 Resistance Source Shialdifig acere ve ne Ser a 4 3 Resistance Source Shielding and 0 4 3 Measuring Resistance Sources Using 16191 4 5 Block Diagrami 155 e ee 5 1 Power SuDDDi d Pc o e P TIONAL TARA Ray o Re Vac
58. Zero Correct registers channel and function dependent ch A V ch A A ch A Q ch B V ch B A and ch B Q After power up each register has a in it To Zero Correct select the desired channel and function lowest range and perform the correction After correction is done the machine reverts back to the 2 mode no need to pro gram 20 after 21 the Model 619 does it automatically 2 25 BASELINE STORE 1 Contents of baseline registers are not updated 2 N1 Baseline registers are updated then it returns to 0 mode 3 Pwr ON DCL SDC default N There are 6 Baseline Store registers channel and function dependent 1 ch A V ch A A ch A Q ch B V and ch B 0 After power up each register has a O in it To store select the desired channel and function and perform the storage The value stored will be used as the correction to the reading when Baseline Suppression is given 2 26 BASELINE SUPPRESSION 1 Uf The contents of any Baseline register will not be subtracted from the reading 2 U1 Subtract contents of appropriate Baseline register from reading 3 Pwr ON DCL SDC default Uf NOTE For Zero Check Zero Correct Baseline Store and Baseline Suppress a trigger must be provided to complete these commands For example if in T1 mode giving Z1X will only set the Model 619 up to do a Zero Cor rect The Model 619 will need to be address ed to talk since in T1 to complete the com man
59. buffer which is tri stated when ASE is high and drives the data lines when ASE is low The information on U709 s input is provided by address switch S701 S701 is located on the rear panel of the Model 6193 IEEE 488 Interface Board The necessary pull up resistors for the switch bank are provided by the thick film resistor network R701 The processor reads these switches and then knows which Talker and Listener address to assign to the 68488 chip and thereby access the instrument U702 and U705 are the data bus buffers for the IEEE bus U704 and U701 are the handshake and control buffers for the IEEE bus The buffers consist of four independent driver receiver pairs with bus termination resistors on board They also have the capability of either tri state or 5 5 Table 5 1 Register Commands Interrupt Status Interrupt Mask Command Status NOT USED Address Status Address Mode Auxiliary Command Auxiliary Command Address Switch Address Serial Poll Serial Poll Command Pass Through Parallel Poll Data In Data Out SYMBOL open collector operation depending on the bus requirement The Model 6193 is designed to use them in the open collec tor configuration U707E T R2 and T R1 form the controi for the bus buffers U701 U704 U705 and U702 U702 and 1705 data bus buffers are fully bi directional as indicated by the arrows on the schematic 30518 U701 Pins 3 5 and 13 which are NRFD ND
60. component location drawings follow the replaceable parts list information contained in this section 1 Component Location drawings for the Model 619 are as follows A Figure 7 1 Mother Board 30411C B Figure 7 2 Display Board 32003D Figure 7 3 Power Supply Board 32004D Figure 7 4 IEEE Interface Board 30329D Figure 7 5 Processor Board 32005D Figure 7 6 Isolator Board 32006D Figure 7 7 A D Converter Board 30395D Figure 7 8 Electrometer Module Board 30387D and 30391D Figure 7 9 Filter Mux Board 30352D Irc mnmmu c 2 Schematic diagrams for the Model 619 are as follows A Figure 7 10 Mother Schematic 30517D Figure 7 11 Display Schematic 30515D Figure 7 12 Power Supply Schematic 30516D Figure 7 13 IEEE Interface Schematic 30518D Figure 7 14 Processor Schematic CPU 30519D Figure 7 15 Isolator Schematic 305200 Figure 7 16 A D Converter Schematic 30521D Figure 7 17 Electrometer Module Schematic 30522D and 30523D 1 Figure 7 18 Filter Mux Schematic 305240 G n m g O 7 1 Table 7 1 Cross reference List of Manufacturers MFR FEDERAL MFR FEDERAL CODE NAME AND ADDRESS SUPPLY CODE CODE AND ADDRESS SUPPLY CODE Allen Bradley Corp Fairchild Instruments Milwaukee WI 53204 01121 Mountain View CA 94043 Analog Devices Inc General Electric Co Norwood MA 02026 24355 Syracuse 13201 American Components Inc Grayhill Inc Conshohocken 19423 14298 La Grange IL 6
61. d 6 12 Mother Board JOATTC 2 oR awk Ola CR P RC EC RC RE CY ARR RYO OEE ORR UR 7 31 Display Board 32003D 2 cli we t ed ERA Mees E S 7 33 Power Supply Board 3200401 va exon a Ue Re x Re Re CORN t es x Rc e MD e hoe AC UG SAONE at e mete 7 37 IEEE Interface Board 203290 Ree Ce Sak ee AO NOU GUN UR CCELI RO Rt 7 39 Processor Boarg 32005D ts 2 dish rhv uu Re Rr OE REA CERDOS CERTE CURE Mo C Re 7 41 Isolator Board 32006D E op Yd cx UR Ro Rue n eR 7 43 A D Converter Board 3039BD 222255 A ERO 7 45 Electrometer Module Board 303870 iii voie hx led e x UE Rx exc 7 47 Electrometer Module Board 30391D ov suere E kx XR ERKa E RENS T ETE 7 49 1 1 1 1 1 t gt lI D 5 n QO N LIST OF ILLUSTRATIONS CONT Title Page Filter Mux Board 30352D 7 51 Mother Board Schematic 305170 2 7 53 Display Board Schematic 305150 7 55 Power Supply Schematic 30516D 7 57 IEEE Interface Schematic 30518D
62. get the current status of Channel B send Talk Address secondary address d Figure 2 12 and Table 2 16 and 2 17 define each byte of in formation QO must be in effect when reading machine status NOTE If SRQ is not read within 100ms after SPE and Talk address the Model 619 resets to default conditions MS BIT LS BIT D108 D107 D106 D105 D104 D103 D102 D101 0 1 0 1 0 X 1 0 1 0 1 0 1 0 1 ERROR CONDITION 0 NORMAL CONDITION 1 SRO BY 619 0 SRQ NOT BY 619 Figure 2 11 Status Byte Status Ch Secondary Address 63 1 2 3 4 5 6 7 8 9 16 411 14 15 FRO FUNCTION RANGE TRIGGER BASELINE BASELINE AUTO AREJEA READINGS CORREC T CHECK STORE SUPPRESS RANGE PE RIOD NATOR 5 D T N FUNC TON RANGE Machine Status oh B RE HECK 2 4 5 6 8 9 18 4 12 _ 15 SUPPRESS RANGE r ERIOD NATOR C F R M 5 D T For kaum power on Channel A status would read in 60Hz operation in 0810403000004 02 In 50117 operation 0010403003008 72 STORE N 1 Figure 2 12 Machine Status Table 2 14 Error Codes Hex Code Meaning ILLEGAL DEVICE DEPENDENT Command ILLEGAL DEVICE DEPENDENT Command Option Attempt to PROGRAM when not in remote No zero check with 2 AMP No zero check with zero correct Spare No autoranging in this range Spare Invalid string with baseline
63. of PROMS DSELS selects 0 00 memory space ROM U907 and DSEL4 selects memory space ROM U906 as there is only maximum of ROM allowed Memory space COOGG DFFF is reserved for external ROM See Figure 5 5 for memory space map NOTE The subscript H as in 200 denotes a hexadecimal location memory or hex notation of a number All of the on board RAM decoding is done by U904B and U914B U904B decodes A14 A15 andc2 to form RAME RAM Enable which enables U914B the 2 of 4 decoder When A13 is low depending on the state of A10 Pin 14 either SRAMI Select lower 1K memory space or SRAM2 Selected upper 1K memory space 0400 07FF is generated to select the appropriate RAM bank The RAM chips are 1K by 4K 21147 memory devices thus two chips in each bank are necessary for the required 8 bits of data 1919 and U920 are the low order 4 bits and U922 and U923 are the high order 4 bits The other signal needed by the RAM s is the WE Write Enable signal This signal is generated by U910C and U909F which decode R W 2 The 5VDC regulated to 590 is provided VR901 and associated capacitors Crystal Y901 and capacitors C910 and C911 form the 4MHz oscillator clock needed by the 6808 IC The 6808 divides this frequency by 4 and provides a 1MHz output Pin 37 E clock for system synchronization 5 6 ISOLATOR BOARD The Isolator board interf
64. on the 2 Volt range Table 2 2 External Feedback Measurements Connect these components between the Input and Analog Output In Order to Measure Charge Capacitor Vout Logarithmic Currents Log Diode Vout IK Log constant Non Decade Current Gains Non Decade Resistors R Vout 1 2 9 6 Zero Controls When there is voltage offset which must be compensated in making precision measurements this compensation is automatic using the ZERO CORRECT push button or by In terface bus command Compensation corrects for offsets on ranges within the selected channel and function 2 5 1 Zero Check A If the displayed Channel or B is not currently in ZERO CHECK depressing the ZERO CHECK push button will a Program the Electrometer to Zero Check b Light the ZERO CHECK annunciator B the displayed Channel A or B is currently in ZERO CHECK depress the ZERO CHECK push button and the Model 619 will a Turn off ZERO CHECK annunciator b Program the Electrometer out of Zero Check C If the displayed channel is in AMPS Range 9 depressing the ZERO CHECK push button will display the error message 2AC no Zero Check in 2 Amp range 2 Zero Correct A If either RATIO or DIFFERENCE is selected this command is locked out and cannot be accomplished B If the Model 619 is not in ZERO CHECK or is 2 Amp current range d
65. panel button or by programming on the Interface bus B the Model 619 is in the Ratio or the Difference A B mode this command is locked out C If the channel currently being displayed is in AUTO RANGE depressing the AUTO MANUAL push but ton will a Turn off the AUTO RANGE annunciator b Place Model 619 into Manual Ranging c Then hold the present range D If the channel currently being displayed is in Manual Ranging depressing the AUTO MANUAL push but ton will a Light the AUTO RANGE annunciator b Begin Auto Ranging c Hold the previously displayed reading until settled range is found then display it E The following ranges cannot be accessed in the Auto Range mode and actuation of Auto Manual in any of these function range combinations will result in an error display of noAU 2 Amp Range This range requires a separate input b External Feedback Amps Function c 2G Ohm through 2T Ohm Range These high resistances require long time constants 2 Uprange Downrange Manual ranges are advanced up or down by pressing the appropriate front panel button The desired range may also be programmed on the Interface bus A Uprange lf either RATIO A B or DIFFERENCE A B is selected this command is locked out and cannot be accomplished if the channel currently being displayed is in AUTO RANGE depressing the UPRANGE button will place the Model 619 is Manual Ranging and advanc
66. section The memory space is 9FFF of which eight locations are used by the chip Placing 0913 in the configuration gives it added flexibility in that it can be used by DMA Direct Memory Ac cess devices or other O components if needed See Table 5 2 for Register Commands 6808 microprocessor data bus 09 07 is buffered and in verted by U921 and U918 to form BD BD7 and is provided to the system The unbuffered data bus s routed to all the memory devices on the PC board The control for data transfer into the CPU is derived by 90 TP7 It decodes 2 A15 A13 and R W to form the RECENB Receive Enable signal The RECENB signal allows the buffer to receive from the data bus The control for data transfer into the CPU is derived by U904C 6 It decodes R W BA 402 to form the DRVENB Drive Enable signal DRVENB signal allows the buffer to drive the data bus Decoded 2 is used for all of the buffers in order to make them tri state for reduction in power consumption The 6808 address bus 15 is buffered by 1908 and U901 to form BA15 which is provided to the system To aid device decoding in the system BA13 BA15 and BVUA are decoded by 1 909 B and U902A to form the I O Enable signal This signal is buffered by U911 to form BIOEN In addition to IOEN U911 does all Table 5 2 Register Commands RS2 RS1 50 CR2 0 Write 3 CR1 1 Write 3 W
67. strap supply consists of U403 0401 and C403 R404 and R407 The bootstrap ground potential is the potential at the summing junction of U404 This ground is used to reference the drive resistors of the other input FET s 0408 0410 and Q411 Decoupling or compensation to prevent instability in the bootstrap is provided by RC s 403 8404 and C402 R405 The control or logic section consists of two latches One latch to switch relays and one latch to control the FET swit ches for the A D buffer amplifier U408 which is the FET control latch clocks in the data that is on the control bus on the trailing edge of address The output of 13408 drives U406 and U407 which are open collector comparators These comparators are used to level shift the 0 to 3 volt TTL signal to 15 to 5 volt signal to drive the FET switches Assignments are signals to drive the FET switches The bit assignments are as follows 1 put the buffer amplifier in X10 gain Aff puts it in the X1 gain Bit 1 Al turns on the signal FET 0409 Bit 2 A1 turns the zero FET 0410 A1 turns on 2 volts FET 0408 Bit 4 A1 turns on the 0 2 volts FET Q411 Bit b not used Bit 6 A1 turns on the charge compensating FET Q406 The software drives this bit with the compliment of Bit 1 Bit 7 Parity Not used in hardware Ooh Wh 1409 which is the relay latch clocks in data that is on the control
68. 0 SECTION 6 MAINTENANCE 6 1 INTRODUCTION This section contains information necessary to maintain the Model 619 Adjustment calibration troubleshooting and fuse replacement procedures are provided 6 2 PRE POWER UP PROGRAMMING The top cover of the Model 619 must be removed to check or change the LINE VOLTAGE LINE FREQUENCY and BEEPER switches To remove the top cover remove the two retaining screws located at the rear of the instrument and lift the cover off WARNING All service information is intended for qualified electronic maintenance sonnel only WARNING To prevent a shock hazard remove the line cord and all test leads from the in strument before removing the top cover 6 2 1 Line Voltage and Frequency Selection Position switches and install appropriate fuse as follows refer to Figure 5 2 1 Remove the power supply shield by carefully lifting it off of the four retaining clips 2 Set up switches S301 and S302 per instructions given in Table 6 1 instructions are also printed on the power sup ply shield 3 Refer to Table 6 1 and select and install the properly rated line fuse CAUTION Installing a higher rated fuse than the one specified could result in damage to the instrument 4 Reinstall the power supply shield Select the appropriate line frequency by setting switch 4 of 5801 Figure 6 1 to the closed position 0 for 60Hz opera tion or to the open position 1 for 50Hz operation
69. 00V 18 996 to 19 004 190 00V 189 96 to190 04 These display readings take into account the errors that may be generated using the input sources listed in paragraph 4 1 2 4 2 4 Resistance Verification 1 Place the instrument in Zero Check Channel A Ohms and Manual ranging 2 Set the Model 619 to 2kQ and apply 1 9000 to the in put of Channel A Zero Correct the display if necessary 3 Release the Zero Check and verify a display reading of 1 9000 3 within 34 counts 4 Refer to Table 4 3 and repeat the above procedures for the remaining resistance ranges 5 If an Electrometer is also installed in Channel B repeat steps 1 through 4 for that channel 6 For ohms sources above 200kQ the resistance element should be shielded to prevent noise pickup Refer to Figure 4 1 4 2 7 For ohms sources greater than 200M Q the resistance should be both guarded and shielded The shield prevents noise injection into the measurement and the guard reduces response settling times see Figure 4 2 This can also be accomplished by using Model 6191 Guarded Adapter see Figure 4 3 Table 4 2 DC Current Performance Check Applied Range Current 1 9000 19 000 190 00nA 1 90004A 19 0004A 190 004 1 9000mA 19 000mA 1 9000A Table 4 3 Ohms Reference Check 1 9000kQ 19 000kQ 190 00kQ 1 9000MQ 19 000 0 190 00 0 1 9000GQ 19 000GQ 190 0060 1 5000 0 Allowable Readings at 18 to 28 1 8941
70. 0525 Amphenol Hewlett Packard Co Broadview IL 60153 02660 Palo Alto CA 94304 Beckman Instruments Inc Intersil Inc Fullerton CA 92634 73188 Cupertino CA 95014 Electronic Inc ITT Semiconductor New Cumberland PA 1707 22526 Lawrance 01841 Bomar Crystal Co M Electronics Co Middlesex NJ 08846 Minneapolis MN 55435 Bourns Inc Keithley Instruments Inc Riverside 92507 80294 Cleveland Ohio 44139 80164 Components Inc Little Fuse Inc Biddeford 04005 06751 Des Plaines IL 60016 75915 Components Inc Mallory Watertown MA 02158 09353 Indianapolis IN 46206 90201 Caddock Mepco Inc Riverside CA 92507 19647 Morristown NJ 07960 80031 Centralab Division k 3M Company Milwaukee WI 53201 71590 St Paul MN 55101 Corcom MOL Molex Chicago IL 60639 05245 Downers Grove IL 60515 Coto Coil Co Inc Monsanto Providence RT 02905 71707 St Louis MO 63122 Continental Wirt Motorola Semi Products Inc Warminster 79727 Phoenix AZ 85008 CTS Corporation Murata Corp of America Elkhart IN 46514 71450 Elmsford NY 10523 Dale Electronics National Semi Corp Columbus NE 68601 91637 Santa Clara CA 94086 Electro Cube Inc 25 NEC Microcomputer Inc San Gabriel 91776 14752 Lexington MA 02173 Electronic Devices Inc Nichicon Corp Yonkers NY 10710 83701 Chicago IL 60645 EMC Industries Inc Nytronics Components Group Hatboro PA 19040 50417 Darlington
71. 1 104M C204 33yF 10V Tant 514 Al TSD 3 10 C 180 33 336 PCM 1287 C205 50V Cerf 514 81 8121 M050 C 237 1 651 104M C207 slurs 50V CerF 514 81 8121 M050 C 237 1 651 104M C208 1000 514 4 8012 5V C 64 1000p 4 72M 05201 Digital Display 1 514 E1 05102 00 21 05202 8 Segment Display 514 E1 FND5101 00 20 05203 8 Segment Display 514 F1 FND5101 DD 20 05204 8 Segment Display 514 F1 FND5101 00 20 05205 8 Seoment Display 514 F1 FND5101 00 20 05206 8 Segment Display 514 F1 FND5101 DD 20 DS207 Digital Display 1 514 61 FND5102 DD 21 DS208 8 Segment Display 514 61 4 FND5101 DD 20 05209 LED Red 514 F4 MV5753 PL 67 05210 LED Red 514 F3 MV5753 PL 67 05211 Red 514 F3 MV5 753 PL 67 05212 Red 514 H2 MV5753 PL 67 DS213 Red 514 F4 MV5 753 PL 67 05214 514 64 MV5753 PL 67 DS215 514 711 753 PL 6 05216 514 F3 MV5753 PL 67 DS217 514 63 MV5753 PL 67 7 4 Table 7 2 Display Board PC 514 Parts List Cont Circuit Schematic Mfr Mfr Keithley Desig Description Location Item No Location Code Part No MON 05218 514 82 31 A3 MV5 753 PL 67 05219 LED Re 514 F3 32 83 MV5 753 PL 67 05220 LED 514 63 33 C3 MV5753 PL 67 DS221 LED 514 H1 34 MV5753 PL 67 05222 514 F4 35 B3 MV5753 PL 67 05223 LED 514 G4 36 C3 MV5753 PL 67 DS224 LED 514 F3 37 B3 MV5753 PL 67 DS225 514 63 38 C3 MV5753 PL 67 DS226 LED 514 F3 39 84 MV5753 PL 67 DS227 LED Red
72. 14 22 PCM1287 J701 Right Angle Mount Rect 517 62 3 4 5 19 84 552791 1 5 377 R701 Thick Film 517 D1 20 05 4308R 101 223 100 5701 Switch 517 1 21 85 206 7 54 377 1701 Bus Transceivers 517 F5 25 C4 MC3448A 193 0702 Bus Transceivers 517 26 04 MC3448A IC 193 0703 Buffer Line Driver 517 85 27 5 7415244 16 230 4704 Bus Transceivers 517 F4 28 4 MC3448A IC 193 0705 Bus Transceivers 517 F3 29 C4 MC3448A IC 193 u 706 517 30 D E4 68488 LSI 14 Table 7 4 IEEE Interface PC 517 Parts List Cont Circuit Schematic PC Board Mfr Mfr Keithley Desig Description Location Item No Location Code Desig Part No U707 Hex Inverter 51 7 SEV 31 04 741 504 16 186 1708 Triple 3 Input 51 7 SEV 32 4 741 510 1 155 1709 3 State Buffer 517 02 33 F4 7415367 16 161 0710 Quad Bus Receivers 517 84 34 4 RT26 IC 180 071 Quad Bus Receivers 5 7 R2 354 F5 8126 IC 180 VR 701 5 Volt Regulator 5 86 37 05 7805 12 93 7 11 Table 7 5 CPU Board PC 518 Parts List Circuit Schematic PC Board Mfr Mfr Keithley Desig Description Location Item No Location Code Desig Part No 50V Cerf 518 85 3 82 8121 M050 C 237 1 651 104M 50V CerF 518 5 4 C2 8121 M050 C 237 1 651 104M luf 50V Cerf 518 85 5 2 4 8121 M050 C 237 1 651 104M luF 50V CerF 518 B5 6 2 8121 M050 C 237 1 651 104M oluF SOV CerF 518 B5 7 F2 8121 M050 C 237 1 651 104M
73. 22 C3 522 02 522 F2 522 02 522 E2 522 2 522 E2 522 F2 522 2 522 62 522 63 522 62 522 4 522 4 523 F4 17 C3 F3 C3 r3763 14742 19 82 20 82 21 2 22 02 23 0 24 02 25 02 26 1 27 2 28 62 29 30 42 31 2 32 83 33 83 34 3 35 83 36 83 37 83 38 C3 29 63 40 C3 A1 E2 42 24 02 50 30 E S50 RD105M 808 000 7 5RU 102K PC Board Mfr Mfr Keithley Item No Location Code Desig Part No C 237 1 0 C 22 001 C 22 001 C 22 001 RF 28 RF 38 RF 28 RF 38 RF 38 RF 38 RF 38 RF 38 RF 38 RF 38 RF 38 RF 38 RF 38 RF 38 RF 28 RF 28 RF 28 RF 28 RF 28 RF 28 RF 28 RF 28 RF 28 RF 46 RF 46 RF 28 7 21 Table 7 8 Electrometer Module PC 523 and PC 522 Parts List Cont Desig Description Location Item No Location Code Desig Part No CR653 Diode Silicon 523 F5 25 D2 T I 1N914 RF 28 CR654 Diode Silicon 523 E5 26 02 T I 1N914 RF 28 CR655 Diode Silicon 523 F4 2 7 03 1 914 RF 28 CR656 Diode Silicon 523 F 4 28 63 1N914 RF 28 CR657 Diode Silicon 523 F1 29 D3 15914 RF 28 CR658 Diode Silicon 523 F2 30 E3 111914 28 CR659 Diode Silicon 523 2 31 03 1 914 RF 28 CR660 Diode Silicon 523 F2 32 F3 1N914 RF 28 CR661 Diode Silicon 523 F3 33 1N914 RF 28 CR662 Diode Silicon 523 F3 34 F2 1N914 RF 28 CR663 Diode Silicon 52 35 F2 1N914 RF 28 CR664 Diode Silicon 523 15 36 2 1N914 RF 28 F601 Fuse 2 Am 5 312002 FU 13 J601 Bindi
74. 5 11 Analog Bus Connector Pin Assignments Valid for 5 16 Analog Bus Connector Pin Assignments Valid for 5 17 Ele trormater Control L rayu ADI po te oe Sd Te e Mns did Reed Ua wale ea t 5 18 Control Data Bit D signation Nate 5 19 Line Voltage SSlactorts Xe eee d slo Deci ee Wisa eee a EORR AU 6 1 Recorimandaed Test EQUIPMENTS 25555 es ee A Gn 6 4 Static Sensitive DeVIGBS DR x coeno ker diete Sedul a ie ue soda ed 6 10 Cross Reference 7 2 Display Board PC 514 Parte List vua ga 7 4 Power Supply PC 515 Parts List ios rd Rt UE EA UR era o or OO te S RO PR OX ONERE e ERU RR Pp aces 7 8 EEE Interface PC 517 Parts A RS Ree elon Ree 7 10 CPU Board PC 518 Parte List REE PTA eee NU balasan ata gb S Qe T e 7 12 Isolator Board PC 519 Parts List E HEC C I o OR ole Receta oa GR Ru s 7 15 A D Gonvartar PC 520 Parts List uuu ores ea cg ete t pa P pu 7 18 Electrometer Module PC 523 and PC 522 Parts 8
75. 51 C 238 1 C 238 1 64 100 238 4 C 64 100pF 6223851 2038 1 203791 6 238 1 CH 14 10 77 29198 TG 47 TG 84 TG 84 76 84 29198 10 77 15 47 16 84 86 TF 85 R 76 6 8M Table 7 7 A D Converter PC 520 Parts List Cont Mfr Mfr Keithley Code Desig Part No R 88 4 99k 4 99k 1 1 8M Fixed 3300 5 1 4W Comp 3300 5 1 4M Comp 220 5 1 4W Comp 10M 10 1 44 Comp 6 8 5 1 4M Comp 10K 5 1 4W Comp Bi Fet OP AMP Triple 3 Input Nand Flip Flop Triple 3 Input Nand Decade a Binary Counter Flip Flop Bi Fet OP AMP Quad 2 Input Nand UP DOWN Counter UP DOWN Counter Decade a Binary Counter Buffer Line Driver Quad 2 Input NOR Bi Fet OP AMP Voltage Comparator UP DOWN Counter Flip Flop Decade Binary Counter Buffer Line Driver Zener Diode Crystal Circuit Schematic Desig Description Location 520 86 520 2 520 F1 520 61 520 F2 520 E1 520 C6 520 A6 520 03 520 E3 520 85 520 F4 520 R3 520 43 520 Several 520 F5 520 65 520 04 520 6 520 Several 520 81 520 2 520 F1 520 6 520 04 520 05 520 6 520 F1 PC Board Item No Location 36 83 37 83 38 83 39 C3 40 C3 41 C3 422 47 81 48 01 49 01 50 E1 51 F1 52 82 53 C2 54 02 55 E2 56 2 57 E2 58 F2 59 8 60 82 61 2 62 03 63 63 64 F3 65 F 3 69 A2 72 C3 Manufacturers Designation includes Parts Description e g CR25 22 52 MFF1 8 CR25 C
76. 514 63 40 4 MV5753 PL 67 05228 LED Red 514 G3 41 84 MV5753 PL 67 05229 LED Red 514 H3 42 C4 5 753 PL 67 LS201 Buzzer 514 F4 51 H3 PM12 6A0 EM 3 R201 10k 5 1 44 Comp 514 C5 55 02 EB R 76 10k R202 10k 5 1 40 Comp 514 D5 56 E2 EB R 76 10k R203 10k 5 1 4W Comp 514 05 57 F2 R 76 10k R204 10k 5 1 44 Comp 514 E5 58 62 R 76 10k R205 10k 5 1 44 Comp 514 F4 59 H2 EB R 76 1 5M R206 47 10 1 24 Comp 514 01 60 3 R207 47 10 1 2W Comp 514 01 61 A3 EB R208 47 10 1 24 Comp 514 1 62 43 amp 209 10 1 2W Comp 514 D1 63 A3 R 210 47 10 1 2W Comp 514 D 64 B3 R211 47 10 1 24 Comp 514 1 65 83 212 47 10 1 2W Com 514 D1 66 A3 EB R213 47 10 1 20 Comp 514 D1 67 R214 47 10 1 24 Comp 514 E3 68 A3 Table 7 2 Display Board PC 514 Parts List Cont Circuit Schematic PC Board Mfr Mfr Keithley Desig Description Location Item No Location Code Desig Part No 47 105 1 W Comp 514 E3 69 43 R 1 47 47 10 1 2W Comp 514 E3 70 83 EB R 1 47 4 7 5 1 48 Comp 514 71 C3 CR25 4 7k R 76 4 7k 1 1 4w 4 7k 5 1 44 Comp 514 E3 72 C3 CR25 4 7k R 76 4 7k 105 1 4w 4 5 1 4W Com 514 73 C3 CR25 4 7k R 76 4 7k 104m 1 4M 68k 55 1 4W Comp 514 E2 74 C3 R 76 68K Switch Pushbutton 514 C5 81 02 i SW 435 Switch Pushbutton 514 05 82 E2 SW 435 Switch Pushbutton 514 05 83 F2 54 435 Switch Pushbutton
77. 85 C3 8T26 IC 180 Static RAM 518 F2 86 E3 2114 151 15 Static RAM 518 F1 87 E3 2114 LSI 15 PROM 518 E3 88 F3 2716 PR0 115 5 Volt Regulator 518 E3 93 03 7805 16 93 5 Volt Regulator 518 B5 94 03 7805 16 93 7 Crystal 518 02 111 2 040 CR 10 Test Point 5 48 D2 CS 339 4 Test Point E5 49 D2 CS 339 4 Test Point E5 50 02 5 339 4 Test Point F5 51 D2 CS 339 4 Test Point E5 52 83 24249A Test Point C6 53 C2 5 339 2 Test Point C6 54 C3 CS 339 2 Test Point B5 55 02 CS 339 2 Test Point 85 56 02 CS 339 2 Test Point A2 57 3 CS 339 3 Test Point Bl 58 C3 CS 339 3 Test Point B2 59 C3 CS 339 3 Jumper G4 97 02 J 3 Jumper 05 98 62 Jumper D6 99 82 Jumper D5 100 2 Jumper 05 101 C2 Jumper ES 102 82 Jumper D6 103 B2 Jumper B5 104 B3 Jumper G4 105 F3 Populated in PC 518 when U906 and U915 are 2716 s 7 14 Circuit Desig ro 50V CerF 50V CerF luf SOV Cerf luF 50V CerF uf 50V Cerf 50V CerF 10 25V Alum 22uF 25V Alum yb 50V Cerf lub SOV Cerk SOV Cert 50V Cerf eluf 16V 0 luF 168 CerD Olaf 164 CerD 22uF 25V Alum 50V CerF luF 16V CerD iuF 50V Cerf Rectifier Rectifier Rectifier Rectifier Connector Thick Film 270 5 1 4W Comp Table 7 6 Isolator Board PC 519 Parts List Mfr Code ERI 519 81 519 B1 519 81 519 81 519 81 519 1 519 81 519 A1 519 65
78. A through 24A 50 204A through 2A 2nA through 24A 70dB 20xA through 2A 55dB OHMS ACCURACY COEFFICIENT MAXIMUM MAXIMUM 1 232 595 0 18 C amp 28 50 C OPEN CIRCUIT RANGE READING r 96rdg counts rdg counts C VOLTAGE TEMPERATURE 2 kQ 1 99999 x 103 0 2 25 0 01 30 20 19 9999 x 103 0 2 96 10 0 0196 3 200 199 999 x 103 0 1596 25 0 0196 30 2M9 1 99999 x 106 0 15 10 0 0196 3 20 0 19 9999 x 106 0 3596 25 0 0296 30 5V 200 0 199 999 x 106 0 35 10 0 02 3 5V 260 1 99999 x 109 0 35 10 0 02 0 3 300V 20 19 9999 x 109 1 96410 0 1596 3 300V 200 GQ 199 999 x 109 4 96410 0 5 0 3 300V 270 1 99999x 1012 10 96410 0 5 0 3 300V OHMS CURRENT SOURCES 2kQ 20kQ 100 200 0 2 15A 20MQ 260 10nA 2060 through 2 0 100pA ANALOG OUTPUT Analog output voltage level is the product of the Ohms current source and the resistance being measured ANALOG SETTLING TIMES To 0 1 of final value unfiltered with 2 0 through 2 0 less than 100pF input capacitance 20M9 20 200 200ms To 1096 of final value unfiltered 2GQ 150ms using 6191 Guarded Input Adapter 20GQ 1 55 with less than 1pF unguarded input 20060 15s capacitance 2TQ 1508 IEEE 488 BUS IMPLEMENTATION Requires installation of Model 6193 Multiline Commands DCL LLO SDC GET Uniline Commands IFC REN EOI SRO Compat
79. AC and DAV respectively are also fully bi directional U704 Pin 11 EO is fully bi directional U707 Pin 11 and U704 Pins 3 and 13 REN and IFC respectively are receive only and U704 Pin 5 SRQ is send only A typical section is shown in Figure 5 4 VR701 supplies the 5 volt 5 regulated power needed by the PCB 5 5 CPU BOARD The CPU board has a circuit which resets the processor upon power up to ensure proper system operation This cir cuit can also be controlled via the watchdog line from one of the interval timers in case of program malfunction This function will be discussed in more detail later in this section The CPU has provisions for 8K words of ROM or EPROM program memory on board with decoding for an additional 8K ROM external It also has provisions for up to 2K RAM Pull Up Enable P U Enable S R scratch pad memory on board With the 6840 LSI chip the CPU can have three hardware interval timers It can support both interrupt and driven 1 O systems A 4MHz crystal oscillator is used to provide all timing for the 6808 CPU chip and digital system components A partially decoded 1 0 enable line IOEN is provided for use by system com ponents to ease their memory space decoding The board is capable of supporting signature analysis troubleshooting techniques 5 5 1 CPU Theory of Operation NOTE When reading through the theory of opera tion for the CPU board refer to Schematic Diagra
80. CA s a h Operating Inst Qs EDS os ue Pec RO y Eee NEA Qe Y ane Uo Rc UE Cod Front Panel BUNCHONS Sc ike Dh Me oed iiu tation Sate ha ten Annunciator and Display Group 1 caso Ey eed sre Bees E Function Selector Group es d aa e eoe do de ae errs ode iro LA E oie IE Dual Gharnnali o doe cette esas C paces EE Se m doas Volts Amps and Onis ied d oat t etia ee cba Wendt pi ksaq umaka ada wee Range GRIGG HOD ae A A ee Zero Controls cere et tate hen ie oes ee e ee da Baseline DI Ue E wes CARER EN dados QU saa RR tabat dod Q0 Aud aote od Resolution ya a SpA vc ice t n Fc E yo Ye is Degen Current Ranges Common Np a7 ACE ce kukaqa l i He e EL aane REX External Fesdbabk Usen os e Dex da ge OP Bav RR RENE MPS EXE MIX Extomal Ttgugat r usu dc Oh Y ob sce es ous D e X Poe cun c au dnt ace er aul aa i a Logarithmic Currants sen pd Non Decade Current Gallis s esan
81. Comp 522 C2 70 A R 1 330k 330k 10 1 24 Comp 522 62 71 82 R 1 330k 10k 5 104 522 72 2 5 456 1035 R 133 10k 10k 5 LOW 522 3 73 2 456 1035 R 133 10k 1 16 7 5W WW 522 5 74 C2 PER SPEC R 262 0 1 330k 10 1 2W Comp 522 02 75 A2 ER R 1 330k 10k 5 1 4W Comp 522 02 76 A2 CR25 5 10k R 76 10k 330k 10 1 2W Comp 522 F2 77 82 1 330 5 1 44 Comp 522 2 78 82 CR25 5 R 76 10 470 5 1 44 Comp 522 H3 79 03 i CR25 R 76 470 680 5 1 4M Comp 522 2 80 03 CR25 5 680 R 76 680 47 5 1 4W Comp 522 81 B3 i 47 5 1 4M R 76 47 23 7 1 1 8W MtF 522 E3 82 83 I MFF 1 8T 1 1 R 88 23 7 2 4k 1 1 84 622 83 83 MFF 1 8 R 88 2 74k 23 7 1 1 8W 922 63 84 B3 1 8T I 1 R 88 23 7 47 5 1 4W Comp 522 85 83 47 5 1 4W R 76 47 2k 1 1 8W 522 F3 86 B3 MFF 1 8T I 1 R 88 2k 47 5 1 4M Comp 522 87 83 47 5 1 4M R 76 47 47 5 1 4M Comp 522 87 83 47 5 1 4M R 76 47 7 23 Table 7 8 Electrometer PC 523 and PC 522 Parts List Cont Circuit Schematic PC Board Mfr Mfr Keithley Desio Description Location Item No Location Code Desig Part No R651 10 10 1 2W 523 2 63 C2 BRN 3386H 1 100 RP 111 10 200 10 1 2M 523 02 64 C BRN 3386H 1 201 111 200 5k 10 1 2W 523 83 65 62 BRN 3386H 1 502 RP 111 5k R654 2 10 1 2M 523 83 66 C2 BRN
82. DJ R415 2V A D REFERENCE ADJ R651 20 RANGE ADJ R652 2004A RANGE ADJ R653 14A RANGE ADJ R654 10nA RANGE ADJ R655 10GQ RANGE ADJ R656 INPUT AMPLIFIER ZERO R657 10kQ R679 0 01 MULTIPLEXER ADJ R680 x0 1 MULTIPLEXER ADJ Figure 6 2 Calibration Cover 4 X0 1 Multiplier Calibration Uprange the Model 619 to the 20 Volt range and apply 19 000 Volts to its input Adjust R680 for a display of 19 000 0 to within 1 count X0 01 Multiplier Calibration Uprange the Model 619 to the 200 Volt range and apply 190 00 Volts to its input Adjust R679 for a display reading of 190 00 0 to within 1 count 20mA Range Calibration Zero Check the Model 619 and set it to the Amps function Uprange to the 20mA range and verify a display reading of 19 000 3 using Zero Cor rent if necessary Release Zero Check and apply 19 000 input adjust R651 for a display reading of 19 000 3 to within 2 counts Refer to Figure 6 5 NOTE For a valid Zero Check reading the input cur rent must be less than 100zA 2004A Range Calibration Zero Check the Model 619 and downrange to the 2004A range Apply 190 00 to the input of the Model 619 release the Zero Check and adjust R652 for a display reading of 190 00 6 to within 2 counts 6 6 8 2uA Range Calibration Zero Check the Model 619 and downrange to the 24A range Apply 1 90004A to the input of the Model 619 release the Zero Check and adjust R653
83. ECENB Receive Enable TP2 in order to gate the data buffers for receiving from the data bus The heart of the lsolator board is the Synertek 6522 Versatile Interface Adapter VIA a fully programmable 1 0 device The VIA internaily consists of 2 software program mable timers 2 programmable bi directional 8 bit parallel ports similar to PIA s and a serial communication port The device contains contro registers which are program mable in determining which of the many modes of operation are to be utilized Lines CB1 and CB2 form the serial com munications port and Port A and PB PB7 Port B form the bi directional parallel 1 0 ports Internal register bits are shown below in Table 5 4 Table 5 4 Register Commands RS3 RS2 RSI 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 RS Register O IRB Effect Handshake IRA Effect Handshake DDRB Data Direction B DDRA Data Direction A T1 Timer 1 T1 Timer 1 T1 Timer 1 T1 Timer 1 T2 Timer 2 T2 Timer 2 SR Serial Port Data ACR Control Register PCR Peripherial Control IFR IRQ Mask IRQ Enable No Efect Handshake 5 11 For the serial O the clock is programmed for 500kHz shift rate The parallel 1 Port A lines PA PA7 are pro grammed as inputs and Port B lines PB3 PB7 are also pro grammed as
84. ED OTHERWISE K 5 gt SESIGNATIGNS USED 2 ALL CAPACITOR VALUES ARE IN MICRGFARADS UNLESS MARKED RWISE PF PICOFARADS N U 3 7 DENOTES INPUT COMMON PU j an 4 DENOTES ANALOG COMMON 5 7 7 DENOTES CHASSIS CONNECTION ES NU EPA 25 aa cee DENOTES INTERNAL ADJUST TO PC 522 SCHEMATIC 305226 6 7 REED RELAY SHIELDS THRU 656 619 ANALOG BUS CONNECT SHIELD TO GUARD ALL OTHERS CONNECT SHIELD TC INPUT COMMON 8 DENOTES FACTORY SELECTED VALUE DENOTES REAR PANEL LOCATION A FORM 28511 B D E F G H Figure 7 17 Electrometer Module 523 Schematic Diagram Dwg No 30523 7 69 7 70 G H EpL Le 1 2650 Ad BEDEASED CS 5 a 172 0 25 0 55 402 Q 74 V 403 No R436 EUM 2424 RA26 1 8 1 1 439 d 47K CHANNEL A HI C405 lt BT 2 To O 1 CHANNEL T C_OVERLEAF TERMINAL Eod dae 9409 401 Qe A PLACES 7 5 10 c gt CHANNEL 10 2 dis v 404 V 52 IMC 3 53 IMC 4 2 54 INC 5 6 04 K 2434 i 30 4K CHANNEL 8 HI cao 1000 47 3 CHANNEL B 14 CHANNEL LO 13 K402 4 HIGHEST SCHEMATIC 2
85. Filter is placed in operation by pressing the FILTER push button or commanding it through the 488 Interface bus an additional 25dB of line frequency rejection filtering is applied 1 2 3 If either RATIO A B or DIFFERENCE A B is selected this command 15 locked out If the displayed channel is not currently in the Filter mode depress the FILTER push button and the Model 619 will A switch the Filter in B Light the FILTER annunciator If the displayed channel is currently in the Filter mode depressing the FILTER push button will A Switch the Filter out B Turn off FILTER annunciator 2 9 9 Resolution Pressing the RESOLUTION push button provides an extra decade of sensitivity and resolution This may also be ac complished by command on the IEEE 488 Interface bus NOTE For example the 2nA range in Resolution will go from 4 digit 100Fa Isd to 5 digit 10fA Isd resolution Noise is typically a few digits in the fifth place 1 If either RATIO A B or DIFFERENCE A B is selected this command is locked out 2 the Model 619 is currently displaying the 4 digits depressing the RESOLUTION push button will A Reduce the reading rate to 2 4rdg sec B Increase the display resolution to 5 digits 3 If the Model 619 is currently displaying 5 digits depressing the RESOLUTION push button will A Increase the reading rate to 5 49rdg sec B Reduce the display resolution to 4 digits NOTE
86. ION see Figure 2 1 If the Model 6193 IEEE 488 Output is installed it will be fac tory set to the Addressable mode at binary address 6 When in the Addressable mode RATIO A B and DIFFERENCE A B are disabled A different address can be selected by set ting switches A1 through A5 of S701 and putting the Model 619 through the power up cycle see Note The switches permit five bit binary selection of addresses O to 31 The Talk Only mode can be selected by setting switch 7 to the closed 0 position and putting the Model 619 through the power up cycle see Note When in the Talk Only mode the address switches are disabled in this mode the TALK ONLY and TALK LED s will light INPUT 2 MES 5 4 Maw celis Pa oL es QL Le 15 eh e t x NW 2 4 d u uve HOW lau kaj Moti 9 RES UNE VOLTAGE M w ADDRESS PHESEL En ife 2 POWER T t TRIGGER VEXTU PEU AT AT OL 04 Y Sat PS up Sad Pet ta Qulpur H P a ole vA 2 Vue 2 n di p AT MEE INTERFACE ELECTROMETER FLECTROMETEA COMPLETE 6184 6194 SROM 6193 3 A6 SLOW BLO 290 125v 1 50 80 250v 9 VOU Figure 2 1 Model 619 Rea
87. Instruction Manual Model 619 Electrometer Multimeter 01981 Keithley Instruments Inc Cleveland Ohio U S A SPECIFICATIONS VOLTS TEMPERATURE ACCURACY COEFFICIENT MAXIMUM 1 YR 23 5 C 0 18 C 28 50 RANGE READING rdg counts counts C 200mV 199 999 x 103 0 01 25 0 002 30 1 99999 0 01 96 10 0 00296 3 20 V 19 9999 0 0296 10 0 00296 0 3 200 V 199 999 0 0296 10 0 00296 0 3 INPUT CAPACITANCE Less than or equal to 20pF INPUT RESISTANCE Greater than or equal to 20 NMRR Greater than 55dB greater than 80dB with FILTER CMRR Greater than 100dB greater than 125dB with FILTER ANALOG SETTLING TIME to 0 196 of final value unfiltered Less than 5 TEMPERATURE INVERTING ACCURACY COEFFICIENT FULL SCALE MAXIMUM 1 23 59 0 18 amp 28 50 ANALOG RANGE READING rdg counts rdg counts C OUTPUT 2nA 1 99999x 109 0 35 65 0 0296 30 0 2V 20 nA 19 9999x109 0 35 35 0 0296 3 2 0V 200 nA 199 999 x 109 0 1596 25 0 0196 30 0 2V 2 1 99999x 109 0 15 10 0 0196 3 2 0V 204A 19 9999x 109 0 15 25 0 01 30 0 2V 200 pA 199 999x 106 0 15 10 0 0196 3 2 0V 2mA 1 99999x 103 0 15 25 0 0196 30 0 2V 20mA 19 9999 103 0 1596 10 0 0196 3 2 0 2A 1 99999 0 15 25 0 0196 20 None INPUT VOLTAGE DROP Less than 1mV at full scale except less than 0 6V on 2A range ANALOG SETTLING TIME to 0 1 of final value unfiltered 2n
88. LK WHEN DUE BODY STYLE C208 MK 7 20 REQ D 209 05 21 THRU 05 229 Figure 7 2 Display Board PC 514 Component Location Drawing Dwg No 32003 sheet 1 of 2 7 33 7 34 060024 ITEM PART m3 2780 2204 c3 2 2 2 2520 AZ 20 20 1252022 AZ 252 73 237 1252 5 AB 425 1225227 22 7951 1225222 23 125223 aim 7 2252294 23 _ 28 25225 29 225220 44 1228277 FORN 285110 SCHEM DESIG 22 22 28278 24 oberg SEPIUS ITEM PART ZONE 22 24 44 i 45 sg 26 KZA 22 52 100202 EZ 57 2203 _ 22 ew 25 4 2274 2 9 2205 92 20 47 2060 207 Lez 22 2 PAZ 2 AB lt 2 2 25 R7647 F4 ZZ v 28 F4 72 EA 74 e 22 G8K RPO I Em r 77 78 9 E SCHEM ITEM PART NO DESIB ZONE SSS s Gi EW 435 S ZO 22 2___ 22100 202 2 _ 83 5222 3 Zodi GZ 08 5205 22 67 27 5W 435 3 208 142
89. Model 619 front panel selector push button switches are active unless LLO is command ed through the bus 2 3 2 9 3 Dual Channel Whenever the Model 619 has a second Model 6194 Elec trometer Module installed Channel or B may be selected from the front panel or bus The two channels are indepen dent so that they operate as two separate instruments and can be separately programmed 1 Channel A Upon power up of the Model 619 CHANNEL A will be displayed in the Channel Status Block B Otherwise depressing the CHANNEL A push button will a Display CHANNEL A data b Light the CHANNEL A annunciator 2 Channel B A Depressing the CHANNEL B push button will a Display CHANNEL B data b Light the CHANNEL B annunciator B If there is no Channel B installed in the Model 619 depressing the CHANNEL B push button will a Display the error message no ch b b Return the Model 619 to the previous operating mode 3 Ratio A B and Difference A B In any Function or Range the Ratio or Difference between Channel A and B from 10 18 to 10 18 may be calculated and displayed NOTE The Model 6193 IEEE 488 Interface must be in the Talk Only mode or else not installed for Ratio and Difference operations A Ratio A B a If the Model 619 is in the Addressable mode the RATIO A B command is locked out and cannot be selected b Otherwise when the RATIO A B push button Is depressed the Model 619 will Light RA
90. NT SOURCE MODEL 619 ELECTROMETER MODULE lt PANEL INPUT MODEL 6011 INPUT CABLE TRIAX CONNECTION Figure 6 5 Range Calibration 20mA 11 20GQ Range Calibration Calibrate the 2000 range see Figure 6 8 Zero Check the Model 619 and uprange to the 20GQ range Connect the 1960 Calibration Resistor to the input of the Model 619 release the Zero Check and adjust R655 for a display reading of 19 000 9 to within 4 15 counts 12 Range Verification After range calibration perform the verification procedures Refer to Section 3 for these procedures 13 Channel B Calibration If a Channel B Electrometer is in stalled in the Model 619 Steps 1 and 4 through 12 must be repeated for this channel NOTE Do not repeat Steps 2 and 3 6 15 CALIBRATION FIXTURE The required calibration fixture uses a source of 1900 resistors must be accurate to 1000ppm 1 The following items are necessary for proper calibration A B C D E F G 2 10 060 resistors Keithley part number R 289 10G 1 100 060 resistor Keithley part number R 289 100G 2 enclosed chassis boxes one to be placed inside the other and insulated from each other 1 triax connector Keithley part number CS 181 1 banana jack Keithley part number 11 16191 Guarded Input Adapter 7024 1 cable 1 ft long male to male connector SR1050 CONFIGURATION FOR 100 RESISTOR RS a 3 E EL T i mS du 1
91. OFARADS UNLESS MARKED CTHEAWISE pf PICOFARADS 5 5 x 5 INPUT COMMON 4 w DENOTES ANALOG COMMON 5 DENOTES TEST POINT CONNECT REED RELAY 60 K602 AND K603 SHIELDS TO INPUT COMMON SCHEMATIC DESIGNATIONS NOT UED SPARES DENOTES REAR PANEL LOCATION uel rt pe a 6 C E D Figure 7 17 Electrometer Module PC 522 Schematic Diagram Dwg No 30522 7 67 7 68 D 6 il KEL Z 99 cases Te sas ET SCHEMATIC DESIGNATIONS 1 NOT USED SEE NOTE BELOW 0909909 d Q R74 R 806 3 65 NOTE NUMBER DESIGNATIONS 890 THRU 650 RESERVED FOR 522 BOARD 2 TO 619 0 655 ANALOG 25 52 26 BUS 6 2 5 22 25 2 tL vk 653 18 i e gt 2p COMMON 21 K654 222 59 2 46 45 006 44 pos 43 CONTROL 42 Rl DATA 4 005 INPUT REGS amp boe IOK 40 poi 32 5 208 455 EN HI gt 2 499 1M 32 FUNCTION ENABLE MODULE Ug SU K kese CHANNEL INPUT O QO ese CHANNEL 1 TUN N RANGE ENABLE V 5 ENABLE 5 YR NOTES 48 2 ACKNOWLEDGE MARK
92. OLS AND TERMS Safety symbols used in this manual are as follows The symbol on the instrument denotes that the user should refer to the operating instructions The symbol on the instrument denotes that 1000V or more be present on the terminal s The WARNING used in this manual explains dangers that could result in personal injury or death The CAUTION used in this manual explains hazards that could damage the instrument 1 6 UNPACKING AND INSPECTION The Model 619 was carefully inspected both mechanically and electrically before shipment Upon receiving the Model 619 unpack all items from the shipping container and check for any obvious damage which may have occured during transit Report any damage to the shipping agent Retain and use the original packaging materials if reshipment is re quired The following items are shipped with ail Model 619 orders Model 619 Electrometer Multimeter with one Model 6194 Electrometer Module and one Model 6011 Triax Input Cable Model 619 Instruction Manual Installed or seperate optional accessories per request Warranty Card s 1 7 SPECIFICATIONS For Model 619 detailed specifications refer to specifications that precede this section 1 1 1 2 SECTION 2 OPERATION 2 1 INTRODUCTION This section contains information concerning unpacking in sepection initial use and operation of the Model 619 2 2 PREPARATION FOR USE The Model 619 is shipped ready f
93. PC 521 Parts List Circuit Schematic PC Board Mfr Mfr Keithley Desid Description Location Item No Location Code Desig Part No 50V CerF 521 02 4 82 8121 050 C 237 1 651 104 16V 521 63 5 83 UK16 104 C 238 1 16V Cerf 521 64 6 B3 UK16 104 C 238 1 16V Cer 521 5 7 C4 UK16 104 C 238 1 eluf 16V Cerf 521 05 9 16 104 238 1 lyF 16V 501765 10 03 UK 16 104 C 238 1 47u4F Polypro 521 81 11 D 4108184 323 47 4 74K ATE 400V Polypro 521 83 12 F3 4108104 C 323 47 4 74K 1000pF 500V Polysty 521 83 L3 F 3 C30V C 138 1000pF 1000mF 1000pF 500V Polysty 521 81 14 63 C30V 5 C 138 1000pF 1000 luf 164 CerD 521 65 15 F3 3 8121 M050 C 237 1 651 104 luf 16V 521 65 16 F4 i 8121 M050 C 237 1 651 104M Relay 521 R2 20 12 RL 60 Relay 521 83 4 21 E3 RL 60 Relay 521 B2 22 RL 57 Relay 521 B3 4 23 F3 RI 57 Relay 521 C 24 3 RL 59 100 5 1 4W Comp 521 6 28 R2 CR25 R 76 100 2 1 1 84 Film 521 03 29 13 3 CMF 1 10 R 88 2 74k 1 1 1 1 84 Film 521 3 30 83 1 10 88 6 04 1 T 1 10 5 1 4W Comp 521 63 31 83 CR25 R 76 10 10 5 1 4W Comp 521 64 32 83 CR25 R 76 10 4 7k 5 1 44 Comp 521 62 33 83 CR25 76 4 7k 7 26 Table 7 9 Filter Board PC 521 Parts List Cont Desig Description Location Item No
94. R25 CR25 CR25 CR25 CR25 LF351N 744 510 741 5 74 741510 741 5393 5 745748 LF351N 41500 5 7415193 5 7415193 SN 7415393 7415244 741502 LF351N LM311IN N 741938 74 53 74 7415393 7415244 1844571 22 1 44 Comp R507 R 76 330 R 76 330 R 76 22 R 76 10M R 76 6 8 R 76 6 8 IC 176 IC 155 144 16 155 213 216 IC 176 IC 163 IC 214 IC 214 IC 213 1C 230 IC 179 IC 176 IC 173 IC 44 1C 242 IC 213 IC 230 07 60 CR 12 7 19 Table 7 8 Electrometer Module PC 523 and PC 522 Parts List lOuF 350V Alum Elect 10 2 350V Alum Elect 4 7yuF 350V Alum Elect 4 7uF 350V Alum Elect luF 250V Met Poly 470uF 16V Alum Elect 470 F 16V Alum Elect 250uF 25V Alum Elect 250uF 25V Alum Elect Oluf 500V 150pF 500V Polysty 0471 250V Met Poly 20V Tant 47pF 500V Polysty 5000pF 500V Polysty 47pF 500V Polysty 500V Polysty 20V Tant IOLF 20V Tant OlpF 500V CerD OluF 500V 101 20V 20V Tant Circuit Schematic PC Board Desig Description Location Item No Location 522 C2 522 C3 522 92 522 83 522 03 522 4 522 C3 522 4 522 4 522 4 523 4 523 82 523 02 523 83 523 83 523 83 523 5 523 03 523 03 523 C4 523 C3 523 13 523 5 350 10 350 10 350VB 4R 7 4 7 C280AE P 100K HC 4C 4 70 16 8 HC 4C
95. SC 29532 Erie Technological Prod Pattison Supply Co Erie PA 16512 72982 Cleveland OH 44125 7 2 Table 7 1 Cross reference List of Manufacturers Cont MFR FEDERAL MFR FEDERAL CODE NAME AND ADDRESS SUPPLY CODE CODE NAME AND ADDRESS SUPPLY CODE SUP Pomona Electric Superior Electric Pomona 91766 052 76 Bristol nena Precision Resistive Products Mediapolis IA 53237 Synertek Santa Clara CA 9505 RCA Corporation Moorestown HJ 03050 02 734 Texas Jnstruments Inc Dallas TX 75231 01295 Richey Nashville TN 37207 293N9 Teledyne Mountain Yiew 0404n 15818 Schuster Electric Co Cincinnati OH 46242 TRU Elect Component IRC Boone NC 2 607 11502 Siemens Corp Iselin 03330 25088 United Chomic 6Con Inc Posemant 60015 Signotics Corp Sunnyvale CA 94086 13324 Victoroen Tnstruments Co lovolant 131503 63060 Sprague Electric Co Visalia CA 93273 14659 Table 7 2 Display Board PC 514 Parts List Circuit Schematic PC Board Mfr Mfr Keithley Desig Description Location Item No Location Code Desig Part No C201 lyF 50v Cerf 514 81 8121 M050 C 237 1 651 104M 50V Cerf 514 81 8121 050 C 237 1 651 104M 203 luF 50V CerF 514 81 8121 M050 C 237 1 65
96. Supply The analog portion consists of bridge rectHiers CR303 and CR302 filter capacitors C304 through C312 voltage regulators VR301 through VR303 and voltage bleeder resistors R303 through R305 The AC power 33VAC that is used by the Electrometer modules is obtained from the winding that powers the 15VDC rectifier filter and regulator portions of this circuitry The regulated voltage potentials of and 15VDC are provided to the mother board analog bus through connector J305 5 3 MODEL 6194 ELECTROMETER MODULE The Electrometer Module is a three function component volts ohms and amps The module construction consists of two PCB s mounted together with a common rear panel All of the module functions and ranges are programmed over the analog bus In its various measurement configura tions the module processes an input measurement to an output of 200mV or 2V which is further processed by the A D Converter and Filter Multiplexer A Model 619 instrument may contain one or two Model 6194 Electrometer Modules When two are installed the one on the left as viewed from the rear is Channel A The second Model 6194 is Channel B Figure 5 3 provides an overall view of the Electrometer Module The heart of the design is a bootstrapped op amp with an ultra low input bias current The input overload protection is provided by a ballast resistance and by current limiting on the bootstrapped output This circuit can be ar
97. TIO A B annunciator Take one reading at 4 8rdg sec rate on Channel A Take one reading at 4 8rdg sec rate on Channel B Compute the ratio Display the ratio at 2 4rdg sec rate with 5 digit resolution 6 Repeat the above sequence c If there is no Channel B installed depressing the RATIO A B push button will 1 Display the error message no ch b 2 Return to the previous operating mode B Difference A B a W the Model 619 is in the Addressable mode this command is locked out and cannot be selected b Otherwise when the DIFFERENCE A B push but ton is depressed the Model 619 will gt gt 2 4 1 Light the DIFFERENCE annunciator 2 Take one reading at 4 8rdg sec rate on Channel A 3 Take one reading at 4 8rdg sec rate on Channel B 4 Compute the difference 5 Display the difference at a 2 4rdg sec rate with a 5 digit resolution 6 Repeat the above sequence c If there is no Channel B installed depressing the DIFFERENCE A B push button will 1 Display the error message no ch b 2 Return to the previous operating mode NOTE Observe that the largest value that can be displayed in the Ratio or Difference mode is 1999 99 x 1018 The smallest value that can be displayed is 0 00000 x 10 18 Any time a division by zero is attempted the display message is OFLO overflow The data used internally by the Mode 619 is to higher resolution than the displayed rea
98. UDDIBSSION vr Pt aa aoa ec deu s CUI kasun Talk Onlv MOUB 55 ae age cance a aT AC SRG Status Byte Formatiu uns E eA d us oa eA RII Path Machine Stati T corte tisu a u NES IP MA RUE D s S qam eda TABLE OF CONTENTS Paragraph Title SECTION 3 ACCESSORIES 3 1 are ysam awaqa Pace oc Ede Edo ER ER 3 2 Model 6191 Guarded Input Adapter 3 3 Model 6193 IEEE Standard 488 3 4 Model 6194 Electrometer Module Mr CT 3 5 Model 8195 Calibration Cover xe RP QD SR Bed era wav a ed E Wee Rad e 3 6 Model 6199 Rack Mounting Kit with Chassis Slides 3 7 Model 7008 IEEE 488 Digital 3 8 Model 6011 Triax Input Cable ed o EORR meets cae aca SECTION 4 PERFORMANCE VERIFICATION 4 1 Q qusa tenet e xor ad 4 1 1 Required Test Equipment
99. V 500 Figure 2 3 Common Input Current Range The input circuitry used in the Model 6194 Electrometer the Amps function is configured in the feedback Amps mode as illustrated in Figure 2 4 An input current applied at the negative input of the op amp is nulled with a current through the parallel combination of R and from the output of the op amp This is accomplished by the high open loop gain typically greater than 40 000 of the op amp which holds its negative input at virtual ground its positive input which is connected to input common Rr in parallel with C converts the input current to a voltage which is fur ther processed by the A D Converter in the Model 619 Included in this processing is a reinversion of the signal polarity to match that of the actual input TO A D CONVERTER ANALOG Tk 6194 ELECTROMETER OUTPUT Figure 2 4 Model 6194 Electrometer Input Circuitry The availability of the analog output permits the user to substitute an external network for combination of R sand C s In effectively applying the capability a number of factors must be taken into account 1 The total absolute value current supplied by the analog output for both feedback to the input and monitoring of the analog output must be less than 22 2 The Model 619 processes the Model 6194 Electrometer output as 2 0000VDC 2 00000VDC in the 5 digit mode signal correctly inverting the polarity for an accurate r
100. VALUES ARE IN OHMS UNLESS OTHERWISE MARKED CK KILOHMS M MEGOHMS ALL CAPACITOR VALUES ARE IN MICRFARADS UNLESS OTHERWISE MARKED e 5 POWER CONNECTIONS uo sorsa 0515 8 4 9502 503 504 505 506 508 518 513 58 usas i Pele fuse sir s 20 ie HIGHEST SCHEMATIC DESIGNATIONS USEO 150 4509 R50 vm 150 SCHEMATIC DESIGNATIONS NOT 4 USEO xr C501 63 524 205 511 514 V T gt x Figure 7 16 Conveter PC 520 Schematic Diagram Dwg No 30521 7 65 7 66 2506 Ceo3 i RED 4 7 l gt i gt 1 1 le C 604 47 4501 F601 2 AMP INPUT 2A 602 HIGHEST SCHEMATIC DESIGNATIONS USED C6lO CR625 A FORM 285110 8 D E G H RELEASED e 12833 ttum on 3 5 80 gt TO PC 523 SCHEMATIC 30523D REISERGISFROM B TOES 20 D We2e6 4 cen 2 10 80 1 PS60323 5 ss sa 5 2 000000 64 Ey 3 ANALOG 4 COMMON 323VAC 4 23VAC 1 H 12 MODULE 3 o OUTPUT ere LOW NOTES ALL RESISTOR VALUES ARE IN OHMS UNLESS MARKED OTHERWISE K KIL CHMS M MEGOHMS 2 ALL CAPACITOR VALUES ARE IN MICR
101. a constant cur rent source for use with the non inverting module output circuitry mode for ohms measurements The five networks used are 100 ohms R601 R607 10kohms R659 R652 1Mohm R660 R653 100Mohms R662 R654 and 10Gohms R663 R655 R666 Potentiometers R651 through R655 permit calibration of five networks Capaci tors C652 C653 C656 C655 and C657 stabilize the feed back response Resistors R661 and R688 protect relay con tact K657 form momentary current surges when capacitors C653 and C656 are connected together Connection of the proper feedback network into the circuit is made by high isolation impedance relays K651 through K654 and normal isolation impedance relay K657 High isolation impedance relay K655 provides a low resistance feedback network which is used for amps zero check Connection to the input by relay K655 is made after R665 to limit the effect of the realy contact resistance on the measured zero offset The ohms voltage reference consists of K658 K659 VR653 U653 R676 R675 R672 R673 R670 R657 and C662 The voltage reference is obtained from VR652 scaled by R670 R672 and R673 and calibrated by R657 Op amp U653 buffers the scaled voltage across R670 providing a low output impedance to the feedback networks C662 and R675 serve to frequency compensate U653 R676 limits the overload current on the output of U653 When VR653 is switched in by relay K659 it limits the voltage across the resist
102. a lines U803 buffers the control and address lines U801E F and U804A decode BA12 and BIOEN respectively to form BDSEL Board Select signal There is no buffering on lines BA12 BA11 and BIOEN as well BA8 9 and 10 since they only represent one load to the bus U801A inverts BDSEL to form BDSEL There is also one chip select for U807 BDSEL is also in verted by U801B to form one chip select for the display board PIA s U802A decodes BAS and 10 to form other chip selects for the interface U802A Pin 4 selects 0807 This decoding arrangement places U807 in memory space 80400 B FF allowing 256 memory locations however only 16 are used U802A Pin 5 forms S1 which selects U204 the display board This arrangement provides 2b6 memory locations of which only four are used U802A Pin 6 forms S2 which selects U207 on the display board This provides 256 memory locations of which only four are used U802A Pin 7 is not used All of the additional signal control lines needed by the display board E A6 A7 and R W are buffered by U803 The Data lines D D7 are buffered by 9805 U806 Reset and 5VDC and ground B com are not buffered All of these lines go to the display board through connector 801 U804C and U801C decode R W E and BDSEL to form DRVENB Drive Enable TP1 in order to gate the data buf fers and to send data to the data bus 08010 and U804B decode R W E and BDSEL to form R
103. able making the enable line go high At the same time U810D Pin 4 latch line goes low this causes the ACK line path to be selected and ACK Acknowledge will be sent back from the analog side If the receiving analog device has latched in its ad dress it responds via the ACK line This is inverted by U813A and goes to opto isolator AT4 and then to U807 CA1 and PB7 CA1 interrupts the system when the line becomes true Polling can be done to sense a change on PB7 U813C provides the drive needed by the opto isolator AT4 There are 2 types of error checking in transit A parity check followed by and ACK handshake completion Upon error retransmission of data can be requested via the software To receive data from the analog side U807 PB2 is set to disable the ACK path and enable the data path via U813D Pin 12 The data shifts out at clock CB1 rate from U816 go ing through U813C D and opto isolator into serial parallel converter 1808 it is then presented to U807 Port A The software can then read the 8 bit data On receive U816 recirculates the data presented to it by the analog side Thus multiple reads and compares may be done via soft ware to enable error checking for receive data Upon error retransmission of data can be requested via the software For test purposes Jumper J1 is provided to allow the Isolator to recirculate data or talk to itself provided 0815 Pin 13 is not being interrupted by the analog bus
104. aces digital bus A to analog bus B Four optical isolators are utilized for signal coupling without impedance coupling Data control and address informa tion is transmitted with odd parity to the analog side of the isolator using three of the optical isolators At the same time data from the A D is transmitted to the digital side of the Isolator board across the fourth optical isolator The Isolator board also provides address decoding and power for the display board as well as buffering for all lines going to the display board from the digital bus Table 5 3 Jumpers for PROM Selection Configuration 2716 PROMS 2k 2732 PROMS 4k W902 W903 W904 X X x X id X Don t Care W907 IW908 W909 X X X X 0 0 Out W906 X X In 5 9 5 10 RAM 2k BUFFER AREA 1k IEEE I O 2k TIMER 1 0 512 INTERNAL PROM 8k 8050 81084 8200 8360 8400 905 980614 5127774 A800 ChB EXTERNAL PROM 8k EADH Figure 5 5 Memory Map 5 6 1 Isolator Board Theory of Operation NOTE When reading through the theory of opera tion for the Isolator Board refer to Schematic Diagram 30520D The Model 619 Isolator board is designed around the Synertek 6522 Versatile Interface Adapter 0807 The board is buffered on data control and address lines to present one bus load to the Model 619 bus U805 and U806 buffer the dat
105. all may be used followed by an execute command X to inititate the change Only after the execute command will the change take place Commands may also be sent in sections for example First Commands Send F1 Second Command Send R2X The above commands are the same as sending F1R2X one command A Function and Range Refer to Tables 2 5 and 2 6 for function and range information B Bus Response Mode a Standard On error or data the Model 619 will not access SRO status byte will still contain up to date information if serial poll done b M1 Interrupt On error or data the Model 619 will access when appropriate c Pwr ON DCL SDC Default Mff C Trigger Mode same for both Channels A and B a Continuous on Talk The Model 619 con tinuously updates the display at the programmed reading rate after being address to Talk The out put data buffer will be updated at the same rate as the display if the data is read out at the same rate If the data is not read out the reading will be held in the output data buffer until it is read out When it is read out the next value will then be placed in the buffer b T1 One Shot on Talk The Model 619 will update the output data buffer at the programmed rate once each time a conversion is initiated by being addressed to Talk to retrigger address to Talk again see Figure 2 8 c T2 Continuous on GET The same as Continuous on Talk except it is d
106. ance being measured The connection of the ohms ref erence to the feedback networks is made via relay K658 Power to ohms reference and the input amplifier is provided by the power supply circuitry which consists of U652 VR651 VR652 R674 R677 R671 C654 C659 and C660 These bipolar voltage supplies are bootstrapped to the Elec trometer module output in the volts and ohms configura tions The negative voltage VR is provided by regulator VR651 Positive voltage VR is provided by U652 which amplifies the reference zener VR652 voltage Capacitors C654 C659 and C660 provide the transient response pro tection The parallel combination of R687 and C665 serves to limit output current from U651 preventing excessive current draw from U652 and subsequent latch up of the input cir cuitry The module output attenuator provides a 2 Volt full scale output to the A D Converter for those ranges and functions which result in a 20V or 200V full scale analog output This portion of the circuitry consists of R679 through R683 and relays K660 through K662 As mentioned previously the A D Converter has two ranges of operation 2V and 200mV full scale Potentiometers R679 and R680 calibrate the two attenuation gains of 0 1 and 0 01 Relays K660 through K662 select either the unscaled module output K661 or the output attenuator K662 x 0 01 or x 0 1 K660 Resistors R686 and R678 included to protect the Elec trometer module circu
107. annel Channel A Amps Channel A Ohms Channel B Volts Channel B Amps and Channel B Ohms b If in Baseline Suppression mode take unit out of Baseline Suppression which will turn off the BASELINE SUPPRESSION annunciator c Return to previous operating mode except Baseline Suppression 2 Baseline Suppression A If either RATIO A B or DIFFERENCE A B is selected this command is locked out the Model 619 is not currently in the Baseline Suppression mode depressing the BASELINE SUP PRESSION push button will a Light the BASELINE SUPPRESSION annunciator b Subtract from display the contents of the ap propriate Channel Function Baseline register e g if 0 10 volts is stored in the Channel B Volts Baseline register subtract 0 10 Volts from readings on all Channel B voltage ranges C If the Model 619 is currently in the Baseline Suppres sion mode depressing the BASELINE SUPPRES SION push button will a Take unit out of Baseline Suppression b Turn off the BASELINE SUPPRESSION annun ciator WARNING if the Model 619 is in the 200 Volt range and in Basline Suppression the BASELINE SUPPRESSION annunciator will blink indicating a safety warning A dangerous voltage level could exist and still be read as a lower voltage as displayed by the instrument This could present a shock hazard should the operator misinterpret the measurement relative to actual voltage 2 9 8 Filter When the
108. ard A Verify data transfer from chip to chip B Verify address logic and timing 5 Isolator and Filter Mux Boards A Verify data transfer through the opto isolators AT1 AT4 on the isolator Board B Check various voltages on the Filter Mux Board as shown in the schematic diagram C Check operation of Channel A and Channel relays 6 A D Converter Checks A Check signal paths from the Filter Mux Board to the A D Board B Check Integrator Output U506 pin 2 as shown in Figure 6 11 Integrator output waveform 7 Electrometer Checks A Check feedback loops of U651 B Check switching order of feedback loops C Check bootstrap supplies Test Points 8 Front Panel Operation It is important to check the front panel opration because it will help to isolate the problem as a result of the read out on the display 6 19 Fan Filter Cleaning The Fan Filter must be kept clean Dirt in the filter will impede the air flow through the Model 619 and cause overheating t is recommended to periodically remove the filter FL 3 and use compressed air to clean it 6 11 SINGLE SLOPE PHASE NEXT MEASUREMENT PHASE CHARGE BALANCE PHASE DELAY DELAY INTEGRATOR INPUT DISABLED Figure 6 11 Integrator Output Waveform 6 12 SECTION 7 REPLACEABLE PARTS 7 1 INTRODUCTION This section contains replacement parts information com ponent location drawings and schematic diagram for the Model 619 cross reference
109. arity in the A D is a square law curve The amount of current removed from the summing junction by this resistor is proportional to the voltage across the diode junction to the summing junction in U507 This induces a compensating logarithmic nonlinear ity The basic nonlinearity is only 10 to 0 The compen sation corrects this error to 1 to 10ppm The residual charge on the capacitor is ramped down to zero volts by the Start Single Slope control signal The single slope current is 1 128 of the charge balance current This ratio is between R501 320k and R501 2 44k taking into account the base emitter coltage drops of Q505 Q508 and Q507d However the charge balance is on only 5096 of the time so the effective ratio is 1 256 Refer to Event Counter Operation During operation the last digit displayed is ap proximately the single slope contribution so this ratio only has to be accurate to 196 to 1096 The IMC1 line has 10 volts on it and is a byproduct of the reference circuit on the Filter Mux board The Clock is composed of an oscillator and a divider circuit The oscillator is a classic Pierce oscillator circuit developing 4 915MHz U516 74193 divides the oscllator frequency to 307 2kHz and 614 4kHz The 307 2kHz after being buffered by U508A is divided down even further to 1200Hz by 0505 LS393 The 614 4kHz is gated into the charge balance cir cuit through U513C and B 5 13 The essentially runs on its own
110. ation Drawing Dwg No 32004 7 37 7 38 962 0 _ D SCHEM PART DESIG NO ZONE ITEM ITEM PART 1 PC 517 1 poses J lc238 1 ca 29 1 193 CORE ENT B IC 193 5 J 703 gt cs 1 186 02358 1 704 204 32 1 155 9708 ES 7 C 238 4 C705 04 33 c tet 0709 8 234 F5 9 35 6 19 20 1F 160 H 1 A SELF TAPPING SCREW MOUNT FROM OPPOSITE SIDE 2 REQ D C70 6204 e me U 70 4704 C705 j 870 a PC 517 4709 CIC 8 9710 gt 970 708 C703 eos urn eco o msn VISION 2562 RELEASED 277 7 RELEASE VERDATE CHG OART WORK WAS REVE G HG 2 C 19O mpm nu CHG C FROM CTF O C 3 4 CHa UFOS FROM LI 1 CHGD ITEM 43 FROM m 4598 TO SO4eiB gt ITEM FROM LSIra4gTOLSI us 514 BD LLL 2 3 4 cna 5 32 X 1 4 PAN HD SCREW AND 6 32 KEP NUT 6 Figure 7 4 IEEE Interface Board PC 517
111. bus on the trailing edge of address Df The bit assignments are as follows turns on relay K401 Channel A Bit 1 Ag turns on relay K403 Channel A s filter capacitor Bit 2 turns on relay K402 Channel B Bit 3 turns on relay K404 Channel B s filter capacitor Bit 4 turns on relay K405 ground relay Bit 5 not used Bit 6 not used Bit 7 Parity Not used ONO AC 5 15 Table 5 5 Analog Bus Connector Pin Assignments Valid for Channel SIGNAL IM Ax CH A LO IM A6 IM A8 IM A10 IM A12 Shielding ground not to be used as a current supply line 5 16 Table 5 6 Analog Bus Connector Pin Assignments Valid for Channel B SIGNAL A 33VAC A COM CH A LO CH B Hi CH B LO A COM A COM A COM COM 15VDC 5VDC IM B4 CH A LO IM B6 IM B8 Shielding ground not to be used as a current supply line 5 17 5 18 Table 5 7 Electrometer Control ADDRESSES A D RANGE CHANNEL A FUNCTION BYTE 000 0101 05 RANGE BYTE 000 1001 09 CHANNEL B FUNCTION 000 0110 06 RANGE BYTE 000 1010 0A VOLTS 1 11 0111 FF B7 VOLTS ZERO CHECK 1 11 0011 FB B3 OHMS 1kohm to 10 0 01 0110 5E 16 100kohm to 100Mohm 1 01 0110 DE 96 1Gohm to 1000Gohm 1 11 0110 EE B6 OHMS ZERO CHECK 1kohm to 10kohm 0 01 0010 5A 12 100koh to 100 1 01 0010 DA 92 1Gohm to 1000Gohm 1 11 0010 EA B2 AMPS Exte
112. cessor Board PC 518 Component Loca tion Drawing Dwg No 32005 7 41 7 42 SCHEM 9807 SCHEM zone ITEM PART DESIG ITEM PART NO DESIG ZONE 1 DESIC D 2 1 2 SW 422 SfO 8 a 2 222 82 4C 7 1 2 237 C c2 A 2 28 5 22 gt C2 287 2238 82 2 79 50 84 40 2 gt 237 224 22 43 110 36 182 Mte 7 237 5 Bz 44 10 02 a2 8 S c 227 0 2 45 116 230 0402 52 82 REN 9 c 314 O CfO7 4122 CREO lt gt fo 314 22 147 702 EZ 84 7 Ceeso2 CS 247 C 237 1 C809 122 45 010 000 82 85 CF 2 232 7 0 2 49 1262 28 4f0 7 Ce C epo Z C 237 9 1 2 15 27 UZOS C Z nm z4 237 C2 5 lt 1209 x gt 238 2 3 amp 2 57 7292 Vf O l i e c 238 109 4 i 55 je 22G Z 022 7_ 258 C 4 6 27 72 FE 48 C 3 4 22 35 2 2 2 ar 237 7 7 2 156 c 236 VHA I TOEN E 2c e 9 5 Z lt 27 VRIS Z2 j 1 Le c 237
113. circuitry includes the following Amplifier Feedback Networks eOhms Reference eBootstrapped Power Supply Regulators Output Attenuator Control Logic Decoders The input amplifier consists of a group of components R664 R665 R668 R667 R669 R656 C651 C658 C661 K656 and 1651 The heart of this section of the circuit is the Electrometer operational amplifier U651 Providing the active forward gain portion of the Electrometer module this circuitry is combined with the feedback networks and bootstrapped ohms voltage reference to provide amps and ohms along with the basic volts measurements Potentiometer R656 is used to trim the input offset voltage for U651 while R667 and C661 provide a pole zero stabiliza tion to this forward gain block of the module R669 is the pull up resistor for the output circuitry on PC 522 R668 provides the input protection for U651 by limiting the input current C658 along with R668 provides input stabilization on and Ohms functions Relay K656 is the zero check contact with R665 limiting the zero check input current R664 and C651 provide compensation for this extra input resistance in the Amps function Five feedback networks are used in setting up the Elec trometer module for both the Amps and Ohms functions Utilizing the inverting mode of the module output circuitry a current to voltage converter is obtained 5 4 A bootstrapped voltage reference develops
114. constitutes the ohmic bulk resistance of the diode junction material and R limit the usefulness of the junction diode as a log converter at low and high currents respectively The factor m introduces non linearities between these two extremes With all these factors taken into account most diodes have a limited range of useful logarithmic behavior A solution to these constraints is the use of a transistor con figured as a transdiode in the feedback path as shown in Figure 2 6 Analyzing the transistor in this configuration leads to the relationship V kT qiInl lo In h 1 hee where is the current gain of the transistor From this equation proper selection of transistor Q1 Figure 2 6 would require a device with a high current gain h which is maintained over a wide range of emitter currents Suitable devices include Analog Devices AD812 and Preci sion Monolithics MAT Q1 Frequency compensation stabilization is accomplished by Selection of a proper value depends on the particular transistor being used and the maximum current level an ticipated Compensation at the maximum current is required since the dynamic impedance of the transistor will be a minimum at this point It should be noted that the response speed at lower currents will be compromised due to the in creasing dynamic impedance Z impedance 2V 21 kT ql 0 026 1 25 C Using the MAT 01 or AD818 a minimum RC time constant of
115. d 2 27 DEFAULT CONDITIONS When an SDC or DCL Channels A and B will go to the following default conditions Volts R4 200V Range Bus Response Mode Standard T Trigger Mode Continuous on Talk Df Data Format ASCII Data String Y LF Programmable Terminator CR LF 53 Measurement Mode Pg Filter Filter Out C1 Zero Check In Zero Check 20 Zero Correct No update of Zero Correct table Baseline Store No update of contents in the Baseline register Baseline Suppression Do not subtract contents of any Baseline register from reading Channel A will be displayed Table 2 13 Reading Rate Modes Trigger to First Continuous Byte Delay c e rdg sec Conversions ASCII Binary ASCII Averaged DO 01 Shot Sequence b f Z C Z C S ZC Z C S Z C Z C S Z S Z C Z C S 2 S C S Z S Z C Z C S Z C Z C S 2 S o C 9 9 99 TBus resolution is always 5 digits Must allow ZC time for analog specs In mSec 250zSec Available in front panel operation via Resolution pushbutton C 5 2 S C 8 2 S S 7 8 2 5 C 5 2 8 S C S 2 S C S2 S S Continuous Sequence nu C uu GOZS Gc S CSZSCSZS C S CSZSCSZS C 5 CSZSCSZS C S CSZSCSZS C S CSZSCSZS C S CSZSCSZS C S CSZSCSZS C On power up the Model 619 will de
116. dge pulse at TTL logic levels The trigger voltage should be between greater than or equal to zero and less than or equal to 5 volts The ex ternal trigger pulse initiates a measurement conversion For one shot T1 and T5 times trigger to first byte refer to Table 2 8 For continuous TO T2 and T4 times refer to Table 2 7 NOTE The external trigger is inhibited in the SO mode or by LLO loca lockout Electrometer Complete The Electrometer Complete output is a 400 wide positive pulse that signifies completion of the measurement conversion cycle The Electrometer Com plete line can be used to trigger another instrument or to in form an instrument that the measurement conversion cycle has been completed For example The Model 619 can be used with a scanner The Electrometer Complete line can trigger the scanner to Switch to the next available channel when the Model 619 measurement cycle has been completed 2 10 2 Charge The measurement of charge can be made directly by using an external feedback capacitor as illustrated in Figure 2 6 In the relationship Q CV Q charge coulombs plied to input C capacitance farads of C and V voltage volts at output as indicated on the display The Model 619 display will read charge directly in the units deter mined by C For example using capacitor will provide a display in In practice should be greater than 100pF for feedback
117. ding Therefore a display of all zeros on Channel B will not necessarily result in a RATIO OFLO 2 9 4 Volts Amps and Ohms Volts Amps or Ohms functions may be manually selected for a wide range of measurements Programmed or soft ware selected may also be obtained through the IEEE 488 Interface bus NOTE In resistance and voltage modes analog out put is noninverted and can be used for guarding 1 Volts A Upon power up the Model 619 will go to the Volts function B If the Model 619 is in the Ratio A B or the Difference A B mode this command is locked out and cannot be selected C Otherwise selecting the Volts function for the cur rently displayed channel will a Light the VOLTS annunciator b Program the Electrometer for the Volts function 2 Amps A the Model 619 is in the Ratio or the Difference A B mode this command is locked out B Otherwise selecting the Amps function for the cur rently displayed channel will a Light the AMPS annunciator b Program the Electrometer for the Amps function 3 Ohms A the Model 619 is in the Ratio A B the Difference A B mode this command is locked out B Otherwise selecting the Ohms function for the cur rently displayed channel will a Light the OHMS annunciator b Program the Electrometer for the Ohms function 2 9 5 Range Selection 1 Auto Manual A Auto or manual range may be selected by pressing the appropriate front
118. e Specified temperatures are package ambient With 1 line period integration NMRR Specifications Assume Valid with DC inputs up to 9096 of fuil scale At 50 and 60Hz max rdg rate with 1 line period integra tion Filtering adds 25dB Analog Settling Time Specifications Assume With less than 1mA of total resistive and dV dT capacitive analog output load max capacitance 5000pF Exclusive of source response time and A D conversion time Refer to Model 619 System Use Specifications for digitiza tion times input Noise 2 54 20 0 5 2004A 205A 2 2A 24 24A 200 204A 0 External Feedback 0 3d Digits peak to peak over 1 minute unfiltered self generated 4 digit readout Input Voltage Drop Whenever a series connected voltage source and resistor are used to calibrate or verify the Model 619 Amps range the effect of the input voltage drop must be taken into ac count From the specifications the maximum value of 1mV will constitute an uncertainty in the effective accuracy of the voltage source Maintaining this source at voltage levels gt 1 9V will reduce this uncertainty to 0 0596 6 10 OHMS Accuracy Specifications Assume With input offset corrected by Zero Correct function after warm up and every 24 hours thereafter Correct whenever dT 1 C Spec exclusive of noise Specified temperatures are package ambient With 1 line period integrations External volta
119. e Uprange one step c the channel currently being displayed is MANUAL RANGE depressing the UPRANGE push button will advance Uprange one step d If the channel currently being displayed is in MANUAL RANGE and on the highest possible range for that function depressing the UPRANGE push button will be ineffective b B Downrange Downrange operates in the same manner as Uprange External Feedback External Feedback is accessible on Amps function by touching or programming UPRANGE on the 2 Amp range a If the displayed channel is in AMPS and Range 20 range above the 2 Amp range the Model 619 will 1 Place the Electrometer in the Ext Feedback mode 2 Light the EXT FEEDBACK annunciator b All status which were in effect for Range 8 in AMPS are in effect for EXT FEEDBACK c Refer to Table 2 2 for measurements which can be made on the Amps function by programming or touching UPRANGE beyond the 2 Amp range NOTE When using a resistive feedback configura tion either linear resistor or non linear log diode junction additional parallel capaci tance will be required for stable opertion See External Feedback Use paragraph 2 10 also see Keithley App note 101 Using the 619 External Feedback Analog output will invert in the Amps func tion but will not in Volts of Ohms functions Output levels and gain are given in full specifications d The A D Converter inverts and displays V u
120. e neon bulbs DS401 and DS402 fire at approximately 85 volts in order to protect the capacitors in the filter from over voltage The leakage resistance at this point due to the neon bulbs will be an order of magnitude less than the least significant digit i e approximately 1ppm This means the off resistance of the neon bulbs is gt 130Gohms The short time constant RC C410 and C411 R436 R437 R433 and R434 is included to suppress high frequency noise from the output of the Electrometer modules When K403 and K404 are actuated R435 and R432 limit the resulting discharge current Protection for the input to the A D Buffer amplifier is pro vided by FET s 0407 and 0412 They clamp the input to 5 volts The op amp U405 provides a zero volt difference bias voltage for the signal FET Q409 and compensating FET 0406 Q406 provides cancellation of the charge injection due to gate drain capacitances of these FET s into the filter capacitors C408 and C409 FET s O410 408 and O411 provide inputs for Zero 2 volts and 0 2 volts respectively The A D Buffer Amplifier is an X1 or X10 gain high input impedance low output impedance stage to couple the various inputs to the 5k input of the A D board The dif ferent gains are obtained by switching in the different feed back resistors The resistors are R418 and R419 They are switched in and out by FET s Q404 and O405 The op amp has a bootstrapped power supply of 6 volts The boot
121. ement to a 200mV 2V signal which is in turn processed further by the A D Converter module and the Filter Mux module Figure 3 3 Model 6194 Electrometer Module 3 5 MODEL 6195 MAINTENANCE KIT The Model 6195 is a maintenance kit for the Model 619 The calibration cover is installed in place of the normal Model 619 top cover during calibration It allows the Model 619 to reach normal internal operating temperature and has 3 2 adjustment openings that are marked to facilitate making the calibration alignments See Figure 3 4 The extender cards allow easy access to the individual boarding for troubleshooting purposes Figure 3 4 Model 6195 Maintenance Kit 3 6 MODEL 6199 RACK MOUNTING KIT WITH CHASSIS SLIDES The Model 6199 is a rack mounting kit for the Model 619 It provides the necessary hardware to mount the Model 619 in a 5 inch 140 millimeter rack height The chassis slide permits the unit to be pulled forward the top cover remov ed and internal adjustments or changes in configuration to be made See Figure 3 5 Figure 3 5 Model 6199 Rack Mounting Kit with Chassis Slides 3 7 MODEL 7008 IEEE 488 DIGITAL CABLE The Model 7008 is a six foot two meter IEEE 488 digital cable The cable has 24 stranded wire conductors and is ter minated with IEEE Standard 488 connectors This will con nect the Model 6193 to any IEEE Standard 488 connectors 3 8 MODEL 6011 TRIAX INPUT CABLE
122. enced to analog common has 15V i596 C J305 pin 9 referenced to analog common has 15V 596 D J305 pin 10 11 and 12 referenced to analog common has 5V 590 J304 pins 6 7 8 and 9 referenced to analog common has 9 5V 590 F Check each PC Board for appropriate voltage as shown on the schematic diagram TRIAX CONNECTOR BANANA JACK IGUARD CONNECTION 1 To decrease settling times and to assure accurate calibrations it is recommended to use an internal guard as shown in the drawing above The guard must be in sulated from the surrounding case 2 To further minimize inaccuracies current leakage paths to ground or guard must be minimized This requires the use of low leakage insulating materials switches for construction and the use of special cleans ing agents such as freon to clean the components and insulators after construc tion Figure 6 9 Calibration Fixture Schematic Diagram 6 10 6191 ADAPTER TRIAX RECEPT 5 uS LLL GUARD LO PP az PLUG HI LO TO 619 CASE GND NOTE TRIAX RECEPT IS INSULATED FROM CASE WHICH 15 GROUNDED THRU TRIAX PLUG ANALOG OUTPUT Figure 6 10 Model 6191 Guarded Adapter 3 Clock Checks A CPU Borad PC 518 U905 pins 38 and 39 has 4MHz ata TTL level B A D Board PC 520 Y501 has 4 915MHz U516 divides this frequency to 307 2kHz U516 pin 7 and 614 4kHz 1516 pin 6 4 Logic Section Checks CPU Bo
123. enol or Cinch Series 57 6193 IEEE Interface rear panel BNC chassis isolated connections for EXTER NAL TRIGGER and ELECTROMETER COMPLETE MAXIMUM ALLOWABLE COMMON MODE VOLTAGES Input LO Channel A to line ground 250V rms DC to 60Hz sinewave Input LO Channel B to line ground 250V rms DC to 60Hz sinewave Input LO Channel A to Input LO Channel B 250V rms DC to 60Hz sinewave 1 hour to rated accuracy POWER 90 110 105 125 180 220 or 210 250V 50 or 60Hz internal switch selected 75W max 100 max internally fan cooled ENVIRONMENTAL LIMITS Operating 0 50 C up to 35 C at 70 condensing R H Storage 20 to 70 DIMENSIONS WEIGHT 432mm wide x 127mm high x 406mm deep 17 x b x 16 stackable enclosure Net weight 9 Bkg 22 Ibs with Channel B Electrometer module and IEEE 488 Interface module ACCESSORIES SUPPLIED One Model 6194 Electrometer Module and one Model 6011 Input Cable ACCESSORIES AVAILABLE Model 1019 5 Universal Fixed Rack Mounting Kit Model 10195 Universal Slide Rack Mounting Kit Model 6011 Triaxial Input Cable 1m 3 ft Model 6191 Guarded Input Adapter Model 6193 IEEE 488 Interface Model 6194 Electrometer Module Model 6195 Maintenance Kit Model 7008 3 IEEE 488 Cable 3 ft Model 7008 6 IEEE 488 Cable 6 ft TABLE OF CONTENTS Paragraph Title gt oo C2
124. epresentation of the input signal polarity This output voltage is the level impressed across the external feedback network 3 Accuracy of the response is the same as that for the 2 Volt range excluding the contribution of all user supplied external feedback circuitry Noise and NMRR will also be a function of this external circuitry 4 Input impedance is given by the relationship 2 0 5MQ 2 where 2 is the external feed back network and A is the open loop gain of the op amp typically greater than 40 000 Note that in Zero Check A is reduced to unity 1 and that represents the parallel combination of the two quantities separated by this symbol AB A B 5 Selection of the external feedback network must incor porate the proper frequency compensation required by the Model 6194 Electrometer Module 6 All external feedback circuitry should be housed in a suitably shielded enclosure Insulators supporting the in put node input HI should be constructed of Teflon or other high quality insulator 2 10 1 External Trigger When the Model 619 is turned on it is in the continuous mode When switch S3 Figure 6 1 Isolator Board is switched to ON and the Resolution button is pressed the Model 619 is placed into the one shot mode T1 The T1 mode allows a trigger only from the front panel by pressing the Ratio Difference button or by the External Trigger The external trigger requires a falling e
125. epressing the ZERO CORRECT push button will a Display the error message corr IL b Then return to the previous operating mode C If the Model 619 is in ZERO CHECK depressing the ZERO CORRECT push button will a Disable the filter b Put the A D Converter in times 10 gain mode and in a 16 66msec integration period c Average 2 conversions d Take a reading with the Electrometer attenuator in 1 and then 10 e Solve for Electrometer and A D offsets f Repeat above steps for 100ms integration time periad g Return to previous operating mode in Zero Check compensating for all internal voltage offsets measured during Steps a through f 2 9 7 Baseline Controls Baseline Controls assist in making relative measurements as referenced to a known value leakage operating parameters etc The Model 619 will subtract this amount on all ranges on the particular channel where a baseline is assigned WARNING The Suppression light will blink on the 200 Volt range indicating a possible high voltage safety hazard 1 Baseline Store A If either RATIO or DIFFERENCE is selected or the instrument is currently displaying OFLO this command is locked out and cannot be accomplished B Otherwise depressing the BASELINE STORE push button will 2 6 a Store the current reading in the Baseline register assigned to the currently displayed Channel Func tion There are six Baseline registers Ch
126. er Multiplexer PROM Quad 2 Input Nand Timing Circuit Quad Bus Receivers Static RAM 518 C5 518 85 518 5 518 1 518 A B 518 1 518 E2 518 C4 518 B3 4 518 05 6 518 D4 6 518 D1 2 3 4 518 4 518 4 518 C3 518 SEV 518 D5 518 5 518 SEV 518 B2 3 518 04 518 518 SEV 518 E2 518 C2 518 E2 24 F3 25 D3 26 E3 32 A3 40 C2 41 A3 42 B3 65 A2 66 82 67 C2 68 C2 69 0 2 70 E2 71 2 72 A2 73 82 78 2 75 2 76 82 77 78 2 79 2 80 81 B3 82 C3 83 E3 8121 M050 651 104M 1503 10 336 1287 8121 050 651 104M 1N914 4306R 101 332 CR25 CR25 7415244 SN74LS20 SN 741 520 5 741527 MC6808 2716 2716 7415244 741504 74 514 7415367 741 500 6840 5 7415139 2716 SN74LS03 NE555 8726 2114 PRO 114 PRO 115 16 230 16 186 C 155 1 161 16 163 LSI 26 IC 190 PRO 115 1 231 16 71 180 151 15 Mfr Mfr Keithley Item No Location Code Desig Part No CLB Manufacturers Designation includes parts description e g CR25 1M 596 1 4W Comp and R903 Order same as current software level displayed on power up For example if C1 is displayed order PRO 114 C1 7 13 Table 7 CPU Board PC 518 Parts List Cont Circuit Schematic PC Board Mfr Mfr Keithley Desig Description Location Item No Location Code Desig Part No u920 Static RAM 518 E1 84 E3 2114 LSI 15 Quad Bus Receivers 518 C1
127. eripheral IC The PCB is buffered on data address and control lines to present only a 1 bus load U703 buffers all of the address and control lines 2 make up the RS RS2 register selects on the 68488 The 68488 has 16 registers of which 8 are read only and 8 are write only The use of the R W read write line allows access to the two 8 register banks See Table 5 1 for Register Commands U707A and U708A decode A11 A12 and IOEN to form BDSEL Board Select TP1 The BDSEL decoding will place the PCB at memory space address 9000 7 This allows 2k of address space for the 68488 of which the first 16 bytes are used U707B inverts BDSEL to form BDSEL U708B decodes BDSEL E and R W to DRVENB Drive Enable TP2 which when high allows the inverting tri state data buffers U711 and U710 to drive the data bus U707C inverts the R W signal to form R W U708C decodes R W BDSEL and E to form REC ENB Receive Enable TP3 which when low allows the inverting tri state data buffers U711 and U710 to receive from the data bus The E signal System P 2 is used in the decoding of U708B and U708C to turn the buffers OFF when they are not driv ing sending therby lowering their power consumption In the 68488 one of the 16 registers RAR is not present on board the chip itself When the chip decodes this register it generates ASE which is used to enable an external register U709 onto the data bus U709 is a tri state
128. esignation F60 for 60 Hz Revision Level C 2 F50 for 50 Hz C 2 During power up the Model 619 will check the operation of each module in the unit as follows 1 if Channel is not present or malfunctions no ch A will be displayed 2 If Channel B is not present or malfunctions ch B will be displayed 3 If the Filter Mux or A D are either not present or they malfunction will be displayed 4 the Isolator is not present or malfunctions no ISO wil be displayed NOTE During operation the Isolator is doing error checking on data going across the Isolator In sending data if after eight retries the data is not sent cor rectly SND E will occur and the transmission is attemp ted again eight more times This process continues until the data is correct In receiving data if after eight retries the data is not received correctly REC E will occur and the reception is attempted agin eight more times This process continues until the data is correct 2 5 BEEPER SELECTION When a button is depressed and the Model 619 circuitry recognizes it the beeper will sound momentarily conditions not recognized by error messages will not beep highest range and uprange The beeper is programmed to be operational at the factory however it can be disabled if so desired To disable the beeper refer to Section 6 Maintenance 2 6 TALK ONLY MODE ADDRESSABLE MODE SELECT
129. essable ADDR or Talk Only are also switchable on the rear panel of the Model 6193 module The Model 6193 was designed to be an interrupt driven I O device The board uses the Motorola 68488 IEEE chip which is capable of performing all IEEE Talker Listener protocols Along with the 68488 IEEE chip it also contains Motorola 3448A IEEE bus transceivers which are capable of driving and or terminating the IEEE bus lines per the IEEE specifica tions See Model 7008 IEEE 488 Digita Cable paragraph 3 7 for cable interconnect Ap 1 Figure 3 2 Model 6193 IEEE Standard 488 Output 3 1 3 4 Model 6194 Electrometer Module The Model 6194 is an Electromete Module that has three functions Volts Ohms and Amps It is an input module for the Model 619 Electrometer Multimeter Addition of a se cond Model 6194 provides dual channel capability with ind pendent ranges and functions as well as ratio and difference capabilities See Figure 3 3 The Module structure consists of two printed circuit boards mounted on a common rear panel The inputs and analog output of the Model 6194 are located on its rear panel The power and control inputs are obtained through the Model PC edge connectors plugged into the Model 619 All Model 6194 Electrometer Module functions and ranges are programmed over the analog bus Converted into its various measurement configurations the Model 6194 Elec trometer Module processes an input measur
130. fault to the above condi tions n addition the Zero Correct table and Baseline registers are cleared Also if the software Watch Dog detects a processing error the instrument is placed automatically in these default conditions 2 28 TALK ONLY MODE The Model 619 may be used with a printer or other nonintelligent devices through the IEEE Bus in Talk Only mode This particular mode is selected by SW7 on the IEEE 488 module See the sketch regarding SW7 In the Talk Only mode ASCII data is sent continuously out to the interface The front panel will default to these conditions Mg T D Y LF All other device dependent commands function range reading rate filter etc are selected via the front panel pushbutton Ratio and difference may be sent in Talk Only mode by not in Addressable mode See Figure 2 1 Address switch A6 is not used as a primary ad dress switch NOTE In Addressable mode the following front panel push buttons are non functional Commands are locked out RATIO Only available in Talk Only mode DIFFERENCE Only available in Talk Only mode Programming Example Channel A Using H P 9820 Desk Top Computer Codes Let Model 619 primary address 6 Binary 00110 Unlisten Talk Address of Controller Primary Address of Model 619 Secondary Address of Channel Continuous on Talk Model 619 will not access SRQ on error or data Amps 100nA Range 6 25 Readings Second Filter Out disabled
131. for a display reading of 1 9000 6 to within 1 count 20nA Range Calibration Zero Check the Model 619 and downrange to the 20nA range Apply 19 000nA to the input of the Model 619 release the Zero Check and adjust R654 for a display reading of 19 000 9 to within 2 counts Refer to Figure 6 6 10 20kQ Range Ohms Reference Calibration Zero Check the Model 619 and set the Ohms function Select the 20kQrange and verify a display reading of 0 000 3 using Zero Correct if necessary Connect the 19kQ Calibration Resistor to the input of the Model 619 release the Zero Check and adjust R657 for a display reading of 19 000 3 to within 1 count Refer to Figure 6 7 NOTE Select the 1960 precision resistor using equipment with accuracy traceable to National Bureau of Standards Laboratory The resistance value should be determined to within 1000ppm VOLTAGE SOURCE SR 1010 CONFIGURATION FOR 1011 DIVIDER 10k 10k 10k 10k 10k 10k 10k 10k 10k MODEL 6011 INPUT CABLE MODEL 619 ELECTROMETER MODULE lt REAR PANEL INPUT lt TRIAX CONNECTION Figure 6 3 Supply Calibration 200mV VOLTAGE SOURCE 1292009 2 A c MODEL 6011 INPUT CABLE MODEL 619 ELECTROMETER MODULE REAR PANEL INPUT lt lt x TRIAX CONNECTION Figure 6 4 Suppiy Calibration 2 Volt VOLTAGE SOURCE L 4200 Qe 3 HO a 79 CURRE
132. g will stop automatically when the ramp has crossed zero 4 Bit 3 Parity this is not used in hardware It is used for the parity bit in software 5 Bit 4 Force Integration is normally a logic 1 for the pre sent software but is could be used to produce long in tegrations under direct processor control 6 Bit 5 Event Counter ACK Enable normally a logic 1 in pre sent software It is used to sense MSB of Event Counter the line when an overflow occurs in a long in tegration 7 Bit 6 Integrate ACK Enable is normally a logic 1 in pre sent software ACK is asserted during the time the in tegration time counter is counting 8 Bit 7 Clear A1 resets all counters to zero and thus stops all functions in progress input Nand gate package 0504 is used to decode so that only 3 of 8 bits are high at any time There are two ad dresses on the board 1 latches the data on the control Bus into the Integra tion Time Counter The address must be present for 4 microseconds and no longer than the integration time otherwise it will retrigger the integration 2 8 latches the data on the control bus into the Control Bit Latch on the trailing edge of the address decoding 5 14 NOTE The ACK line is low under the conditions described in the preceding steps 1 through 8 5 9 FILTER MULTIPLEXER BOARD NOTE When reading through the theory of opera tion for the Filter Mux board refer to Schematic Diagra
133. ge sources 50g V 6 11 ENVIRONMENTAL CONDITIONS Calibration should be performed under laboratory condi tions having an ambient temperature of 23 1 and a relative humidity of less than 7096 If the instrument has been subjected to temperatures outside of this range or to higher humidity allow one hour minimum for the instru ment to stabilize at the specified environmental conditions before beginning the calibration procedure 6 12 CALIBRATION NOTE When calibrating Channel B paragraph 6 14 do not repeat steps 2 and 3 of same paragraph order to reduce the response time induced by stray capacitance the Model 6191 Guard ed Input Adapter could be used for reduced input cable effect see paragraph 3 2 The internal short across the 10 resistor must be in place when using the Model 6191 for calibration 6 13 CALIBRATION COVER INSTALLATION Calibration should be performed using the Model 6195 Calibration Cover see Figure 6 2 This cover permits ac cess to Model 619 and to Model 6194 adjustments while allowing the instrument to reach normal internal operating temperature Install the cover as follows WARNING To prevent a shock hazard remove the line cord and all test leads from the in strument before removing the top cover 1 Turn the power off and disconnect the line cord 2 Remove the two screws holding the top cover These screws are located on the rear panel 3 Grasping the top cover a
134. h 4 2 2 Voltage Verification 1 Place the instrument in Zero Check Channel A Volts and Manual ranging 2 Set the Model 619 to the 200mV range and apply 190 00mV to the Channel input Zero correct the in strument and verify a display reading of 0 00 3 to within 1 count 3 Release the Zero Check and verify a display reading of 190 00 3 to within 6 counts 4 Repeat steps 1 through 3 using negative voltage 5 Refer to Table 4 1 and repeat the above procedures for the remaining voltage ranges 6 If an Electrometer is installed in Channel B repeat steps 1 through 5 for that channel 4 2 3 Current Verification 1 Place the instrument in Zero Check Channel A Amps and Manual ranging 2 Setthe Model 619 to the 2 range and apply 1 9000nA to the Channel A input Zero correct the display if necessary 3 Release the Zero Check and verify a display reading of 1 9000 9 within 59 counts 4 Refer to Table 4 2 and repeat the above procedures for the remaining current ranges 5 If an Electrometer is also installed in Channel B repeat steps 1 through 4 for that channel NOTE For the 2004A through 20mA ranges for valid zero correction input current must be no greater than 100 Zero correction does not apply to the 2A range Table 4 1 DC Voltage Performance Check Applied Allowable Readings Range Voltage at 18 to 28 C 190 00mV 189 94 to 190 06 1 9000V 1 8997 to 1 9003 19 0
135. he bus Format is first in first out An BUFFER 20 READINGS X command clears the buffer BUFFER 30 READINGS 5 In M1 which is a Bus Response Mode when the buffer is BUFFER 40 READINGS full it wil generate an SRQ see SRQ Status Byte Format BUFFER 50 READINGS paragraph 2 29 6 Cannot use buffer with T5 which is one of six Trigger modes In the T5 Trigger mode each time an X is given the Model 619 will update the output data buffer and then clear it therefore it will never fill up This will work with T4 Trigger mode since in this mode only one is need ed see Table 2 12 Function Range 7 the Model 619 is in a one shot Trigger mode there will Channel _ be no reading until the buffer is filled up Therefore it will Integration take multiple triggers to fill the buffer 5 S1 114 msec 51 50 48 msec 2 20 MEASUREMENT The time required to make measurement is the sum 1 Control or command time to the Electrometer or Table 2 10 Data Terminators measurement source 2 The analog settling time This is specified to 0 1 set tling All time constants are roughly first order FUNCTION 3 The time from trigger to first byte available Y lt DEL No terminator A This time is specified for various resolutions Y CR LF CR dual terminators B In addition time must be added if the conversion is Y LF CR LF dual terminators the first on a new range or function see Tab
136. ible with 488 1978 standard PROGRAMMABLE PARAMETERS Front Panel Controls Function Range Filter Zero Check Zero Correct Baseline Store Baseline Suppress Internal Parameters SRO Response Trigger Modes Binary or ASCII Data Formats number of readings to be stored data terminators reading rates integration period ADDRESS MODES TALK ONLY and ADDRESSABLE READING RATES Programmed Number Of Time Per Trigger To Reading Integrations Integration First Byte Readings Rate Averaged _ ms _ Per Second 50 1 4 1 32 18 binary 40 51 1 16 67 35 21 S2 2 16 67 80 10 53 4 16 67 168 5 4 54 1 100 120 4 7 5 2 100 328 2 4 56 4 100 742 1 2 57 8 100 1680 0 6 58 16 100 3360 0 3 59 32 100 _ _ 6720 0 15 20 50Hz GENERAL DISPLAY Numeric 0 56 LED digits 4 digit mantissa 0 6 2rdg s 5 digits 2 4 rdg s in high resolution mode 2 digit exponent decimal point signed exponent and mantissa OVERRANGE INDICATION Display reads OFLO MAXIMUM ALLOWABLE INPUT 250V rms DC to 60Hz sinewave INPUT CURRENT 189 28 Less than 0 4pA EXTERNAL TRIGGER TTL compatible EXTERNAL TRIGGER and ELEC TROMETER COMPLETE INPUT CONNECTORS 6194 Electrometer rear panel 2A range 5 way binding posts All other functions and ranges via Teflon insulated triaxial connactor OUTPUT CONNECTORS Analog Amphenol Series 80 Microphone 6194 Electrometer rear panel IEEE Amph
137. ine cord and all test leads from the in strument before removing the top cover 2 Set switch 2 Figure 6 1 on the Isolator Boardto the open position 1 3 Reinstall the top cover 6 5 CALIBRATION INTRODUCTION Perform the following procedures and make the adjustments indicated to calibrate the Model 619 Elec trometer Multimeter and the Model 6194 Electrometer Module s Calibration of the Model 6194 requires install ation in a Model 619 main frame Therefore the following procedures include calibration of the module as part of the entire instrument Calibration should be performed yearly every 12 months or whenever performance verification see Section 3 indicates that the instrument is out of specification SWITCH 1 1 BEEPER ON 0 BEEPER OFF SWITCH 2 1 58 RATE 54d 0 55 RATE AT 52d SWITCH 3 EXTERNAL TRIGGER SWITCH 4 1 50H 0 60 OPEN 1 CLOSED 0 Figure 6 1 Isolator Board and Switches Calibration of the Model 619 requires cur rents and impedances outside the ranges normally encountered in calibration laboratories Due to the need for special handling high level technical expertise and non standard test equipment it is strongly recommended that the Model 619 be return ed to the factory for service and or calibration 6 6 CALIBRATION TEST EQUIPMENT AND CONDITIONS 6 6 1 Recommended Test Equipment and Related Information Test equipment for calibration is listed in Table 6 2 Al
138. inputs Port B lines and are programmed as outputs The actual operation is as follows A byte of data is written via the software into the 6522 VIA serial out register The LS device forms the clock and data for the serial bit streams on CB1 and CB2 The clock bit stream goes through UB09A and opto isolator AT3 and U810A to be the shift clock for U812 U815 serial to parallel converters and U816 parallel to serial converter on the isolated side U809A Pin 14 is a clock enable which is utilized to disable the clock if the need arises U809A also provides the drive needed by the opto isolator The data bit stream goes through opto isolator and U810A to be the data for shift register UB12 and U815 U809B provides the drive for the opto isolator AT2 U811 and 0814 are generator parity checker devices When the shifting is completed U811 Pin 5 goes low this indicates odd parity During the shifting operation this line goes low many times depending on the state of the shift registers Therefore U810B Pin 9 is an enable line so that when the data has been sent the software causes an enable low after shift On the analog digital bus this is used as an address latch enable signal to latch in the address of the analog device to which data is being sent The data to be written is placed on the outputs of U815 and the address is placed on the outputs of U812 The software then sends PB2 which disables the address latch en
139. itry Resistor R678 protects the module from imposing a voltage potential from analog out put J652 common to module input J651 common Resistor R686 protects the module from transient voltage input from the module output connection in the analog bus The remaining portion of the Model 6194 Electrometer cir cuitry is the Contro Logic Decoder This portion of the module consists of U654 through U658 Q651 R685 C664 and commutation diodes CR652 through CR663 and CR664 U654 and U655 are D type transparent latches which store the appropriate data from control data inputs and drive the module configuration relays Data is clocked in by decoding the module address through U656A and B Controlling the module requires Function Byte U654 and a Range Byte U655 which are latched with the ap propriate address These addresses and function range bytes are listed in Table 5 7 The identification or control performed by each data bit in the function range bytes is listed in Table 5 8 An acknowledge circuit which consists of U656 R684 and Q651 provides output to a wired NOR control line on the Analog Bus This serves to acknowledge the receipt of a proper address by the module The section of circuitry consisting of U657C and D R685 CR664 and C664 performs a power up disable function The output of both latches U654 and U655 will be disabled upon power up until receipt of a proper module function byte address This pre
140. l 619 mother board PC 516 This connec tor ties the module to the analog bus Tables 5 5 and 5 6 are the pin assignments for Channel A and B Electrometers respectively The input module identity is wired into the mother board by transposing address lines and A1 be tween Channel A and Channel B locations on the mother board 2 AMP Input 2 AMP Fuse Analog Output AMPS Zero Check Iz xad p Electrometer Feedback Input Resistances VOLTS OHMS Zero Check Rear Panel Inputs Outputs Isolated v ACKNOWLEDGE Power Supp ppiy 33VAC 2 AMPS X0 1 0 1 X0 01 10Ka VH V All Switches Address Decoders Module and Latches Output ADDRESS Contro Data Motherboard Connections Figure 5 3 Electrometer Module Block Diagram PC 522 30522D contains the module power supply out put circuitry and 1 Amp current range shunt The power supply portion of the circuitry provides three basic voltage levels for the module It provides 260VDC TP 1 and TP 2 to input common which is used by the output circuitry when configured in the Volts or Ohms functions it also pro vides 8VDC TP 3 and TP 4 to TP 6 for use the output circuitry when configured in the Amps function This also eliminates the necessity of the 260V supply having to sup ply greater than 2mA The 17VDC TP 7 and TP 8 to TP 9 bootstrapped supply is used by the input amplifier and ohms refere
141. le 2 12 Y CHAR CHAR any 8 bit ASCII value except reserved letters for conversion times E R M T D Q Y S P Z N U X 4 Time to transmit data over the bus A In ASCII data format 16 to 18 bytes are to be Pwr ON DCL SDC Default Y LF Note CR OD transmitted 4 in binary mode B Time is determined mainly by the controller C The Model 619 can transmit data as fast as 57 per byte However in the SO mode a 6ms delay occurs with each string D if the controller waits more than 5 2msec before obtaining the next byte the Model 619 may delay completion of the bus handshake by up to 3ms 2 15 2 21 READING RATE MODES See Table 2 13 The Integration period is measured in milliseconds Signal zero and calibrate integration periods are equal When one of the measurement modes is triggered the A D will signal integrate autozero and autocalibrate The A D will do a new autozero and autocalibrate if there is time to do them and another trigger is not given The Z is autozero C is autocalibrate S is signal integrate The trigger is indicated by a single quotation mark The data is ready signified by double quotation marks The delays are measured in milliseconds The IEEE bus has approximately 5 2msec to take a reading once data is available If the reading is not taken in this time the retrig ger rate will be slowed down and will miss the reading in the continuous mode In
142. list of manufacturers is also provided see Table 7 1 7 2 PARTS LIST Parts are listed alphabetically in order of their circuit designations Table 7 2 contains parts list information for the Display Board PC 514 Table 7 3 contains parts list infor mation for the Power Supply PC 515 Table 7 4 contains IEEE Interface PC 517 parts list information Table 7 5 pro vides parts list information for the CPU Board PC 518 while Table 7 6 contains parts list information for the Isolator Board Parts list information for the A D Converter PC 520 is presented in Table 7 7 Parts list information for the Elec trometer Module PC 523 and PC 522 are provided in Table 7 8 Table 7 9 contains parts list information for the Filter Mux Board PC 521 Table 7 10 provides parts list informa tion for the Fan assembly 7 3 ORDERING INFORMATION To place an order or to obtain information concerning replacement parts contact your Keithley representative or the factory See inside front cover for addresses When ordering include the following information 1 Instrument Model Number 2 Instrument Serial Number 3 Part Description 4 Circuit Description tif applicable 5 Keithley Part Number 7 4 FACTORY SERVICE the instrument is to be returned to the factory for service please complete the service form which follows this section and return it with the instrument 7 5 SCHEMATIC DIAGRAMS AND COMPONENT LOCATION DRAWINGS Schematic diagrams and
143. m 30519 for reference designations The Model 619 Electrometer Multimeter control processor unit CPU is constructed around the Motorola 6808 micro processor U905 This particular processor is a Motorola 6800 series processor with an internal clock The Motorola 6808 LSI microprocessor requires a 20msec reset pulse when power is turned on to get its dynamic buf fers and the clock running properly This reset delay is pro vided by timer U917 The output of U917 is inverted by U916D and applied to the reset pin of the microprocessor Bus Send Rec Data Figure 5 4 Data Bus Buffer 5 7 Pin 40 It also goes to all other devices in the system which require power up resets via bus Pin 28 1 PIA s VIA s etc U913 is a Motorola 6840 timer peripheral It is part of the Motorola 6800 series family of parts The 6840 U913 contains three fully programmable hardware timers with in terrupt and output capability U916c is controlled by the 6840 U913 software controllable timer 1 which monitors the running software U913 timer 3 is used to establish real time interrupts to the running software U913 timer 2 out puts a 120Hz signal on Pin 3 TP12 to allow oscilloscope monitoring for determining whether the IC is functional U913 is 1 0 device to the system U902B decodes 9 BA10 BA11 and BA12 to form one chip select for U913 The other chip select for U913 is provided by BIOEN which will be discussed later in this
144. m 30524 The Filter Mux board consists of the signal conditioning cir cuitry and references for the A D board Channel A and B Electrometers are selected by the appropriate relays These relays K401 and K402 connect signal and ground on the Electrometer module to the A D s signal and ground inputs The Signal FET Driver amplifier U405 is used to minimize charge injection from the gate source capacitance of the FET into the filter when it is in use The Input Buffer U404 is bootstrapped for linearity it can be switched from a times one gain to a times ten gain Two references are available for calibration a 2 volt reference and a 0 2 volt reference The Electrometer Multiplexing relays switch signal and ground from the two Electrometer modules to the input of the A D The switching is done by K401 and K402 The relays also provide isolation between the two channels The Ground Relay K405 protects K401 and K402 from arc ing or flashover when switched to the A D A large tran sient is possible when this happens due to the stray capacitance between the A D ground and the Electrometer ground R431 10k limiting the current during the transient K405 is then closed to eliminate rejection problems caused by having the resistor in the ground lead The RC filter which is a single pole filter can be switched into the input of the A D Converter via relays K403 and K404 The filter consists of C408 and C409 R433 R436 and R437 Th
145. mable control registers which determine which of many modes of opera tion are to be used The PIA s also contain two program mable data direction registers which are also data 1 0 registers if bit 2 in the corresponding control register is set to 1 Both control registers are initialized to 3C This con figures the PIA s for non interrupt operation stan dard mode Data direction is configured for U204 by Port A outputs and Port B outputs and for U207 by Port inputs and Port B outputs U204 Port B is the common cathode control strobe used to turn the display on Each of the eight lines turns on one bank of LED s plus one display digit U207 O Port B is the segment select control to select appropriate segments of the display digits U204 1 0 Port A lines PAO PA1 and PA2 are the LED select controls to select the appropriate LED in the LED bank 1204 1 0 Port A line is used to key the beeper on and off U204 Port A lines PA4 PA7 form the column lines to the switch matrix and U207 Port A lines form the row lines to the switch matrix U204 Port lines PA4 PA7 are used to enable the appropriate switch column for the software switch scan U207 Port is used to read the scanned switch bank to determine which switch has been depressed Switch debounce N key rollover and switch validation are all done in software U201 0203 and 0205 are buffers to drive the displays and switches 5 8 A D BOARD The A
146. me as voltage across unknown Refer to paragraph 6 6 1 for F S values Output Resistance 1kohm Maximum Allowable Output Current 1mA Maximum Allowable Input Voltage externally applied with respect to Analog Output common 20 Volt peak 6 8 VOLTS Accuracy Specification Assume With input offset corrected by Zero Correct function after warm up and every 24 hours thereafter Correct whenever gt 19 Spec exclusive of noise Specified temperatures are package ambient With gt 1 line period integration Temperature Coefficient Specifications Assume With source resistance lt 100Mohm NMRR Specifications Assume gt 55dB valid with DC inputs up 9096 of full scale Rating based on 1 digit injection on 2 Volt through 200 Volt ranges and 4 digits injection on 200mV range At 50 and 60Hz max rdg rate with 1 line period inte gration Filtering adds 2548 CMRR Specifications Assume 100dB valid for 200mV and 2 Volt ranges Rating decreases to 80dB for 20 Volt range and 60dB for 200 range At DC 50 and 60Hz with Tkohm unbalance max rdg rate 1 line period integration Analog Settling Time Specifications Assume Exclusive of input noise with less than 1mA of total resistive and dV dT capacitive analog output load max capacitance 5000pf Exclusive of source response time and A D conversion time Refer to Model 619 Systems Use Specifications for digitization times Input Noise 20 A
147. nce 305230 The transformer 601 in addi tion to providing the various voltage levels serves to isolate the module from other instrument voltage sources The center of the output circuitry is a bipolar totem pole ar rangement consisting of high voltage transistors Q601 Q603 Q604 and Q602 Resistors R601 R606 R608 and R602 bias their respective transistors to ensure that the voltage burden is equally divided between the two tran sistors at each end of the network The network is current biased by the voltage developed across CR615 through CR618 CR615 through CR618 are essentially connected across the totem pole arrangement In the Amps function the contacts B and C of relay K602 short out R615 and R617 This action increases the bias current level The bipolar networks consisting of Q605 Q606 CR620 CR619 R613 and R615 limit the output current ranges The top ends of the high voltage totem pole which are discon nected by contacts A and B of relay K601 prevent ex cessive power from getting to this particular portion of the circuitry In this mode input is supplied to Q603 and Q604 through CR605 and CR608 Capacitor C605 serves as response stabilization in the Amps configuration CR605 through CR608 have an additional function in disconnecting the 8 supply TP 3 and TP 4 to TP 6 from the circuit when it is in the Volts or Ohms functions CR602 and CR604 disconnect the entire output circuit from the 260VDC s
148. nd PC 522 Parts List Cont Desig Description Location Item No Location Code Desig Part No R679 105 1 2W 523 04 2 3386H 1 502 RP 111 5k R680 500 10 1 2W 523 5 92 F2 3386H 1 501 RP 111 500 R681 10k 1 1 2W Comp 523 5 93 F2 R 287 10k R682 898k 1 1 1 4W Comp 523 E4 94 2 R 286 898k R683 89 8k 1 1 1 4W Comp 523 E4 05 F R 286 89 8k R684 4 7k 5 1 4W Comp 523 F 5 96 F2 4 CR25 R 76 4 7k R685 22k 5 1 4M Comp 523 F5 97 F2 CR25 R 76 22k R686 4 7k 5 1 4M Comp 523 E5 98 62 E CR25 5 4 7k R 76 4 7k R687 5 1 4W Comp 523 64 99 C3 CR25 54 1k R 76 1k R688 100 5 1 44 Comp 523 4 100 C3 CR25 5 lk R 76 100 T601 Transformer 522 852 3 4 4 TR 176 1651 10 99 523 C4 109 C3 AD515K IC 241 1652 741 OP 8 Pin Dip 523 02 110 02 SIG N5741V IC 42 1653 741 10 99 523 C3 111 03 741 IC 77 U654 8 Flip Flops 20 Pin Dip 523 64 112 2 7415374 IC 242 a Flip Flops 20 Pin Dip 523 62 113 3 7415374 1 242 3 Gates 14 Pin Dip 523 05 114 F3 741 510 16 155 4 Nand Gates 14 Pin Dip 523 E5 115 741500 IC 163 4 OR Gates 14 pin Dip 523 F3 116 F3 SIG N7432A IC 115 Regulator 10 220 523 D3 122 C3 uA 7908UC 16 243 Zener Diode 523 02 123 03 184577 02 58 Zener Diode 523 C2 124 03 1N 749A 07 63 Manufacturers Designation includes Parts Description e g CR25 52 1 4 Comp R687 7 25 Table 7 9 Filter Board
149. ng Post n5 SUP 1517 BP 11 2 J602 Binding Post Black B5 SUP DF 21 RC BP 11 0 9651 Jack Triax 5 POM 3580 CS 253 J652 Connector Microphone 1 BOPC2F CS 32 K601 Relay 522 603 49 C3 COT 01745027 RL 66 K602 Relay 522 63 50 C3 COT 0745027 RL 66 K603 Relay 522 62 51 3 COT UFAO0118 RL 65 K651 Relay 523 32 43 82 COT 1 40117 RL 64 K652 Relay 523 83 44 n2 COT UF40117 RL 64 K653 Relay 523 B3 F 45 B2 UF40117 RL 64 K654 Relay 52373 46 2 UF40117 RL 64 K655 Relay 523 B2 47 83 UF40117 RL 64 K656 Relay 523 B5 48 83 h UF40117 RL 64 Relay 523 B2 F 49 02 UF40118 RL 65 Relay 523 03 50 D2 oC UF 40118 RL 65 Relay 523 02 51 02 UFA0118 RL 65 Relay 523 D4 52 2 UF40118 RL 65 7 22 Circuit Desig Table 7 8 Electrometer Module PC 523 and PC 522 Parts List Cont mes Description Location Item No Location Code Desig Part No Relay 523 05 53 F2 UF40118 RL 65 Relay 523 D5 E3 54 F2 UF40118 RL 65 Transistor NPN 0 5 522 D3 57 82 2N3439 TG 93 Transistor PNP TO 5 522 F3 58 B2 2N5416 TG 105 Transistor NPN 70 5 522 03 59 82 243439 16 93 Transistor PNP 0 5 522 F3 60 82 235416 TG 105 Transistor NPN 92 522 E3 61 83 2N3904 TG 47 Transistor PNP 10 92 522 62 83 2N3906 TG 84 Transistor NPN 0 92 22 H2 63 03 1 2N3904 TG 47 Transistor NPN 10 92 522 H3 64 03 283904 0 47 Transistor 0 92 523 65 58 E2 2N3904 TG 47 330k 10 1 2W
150. ns functional and circuit descriptions of the component parts of the Model 619 and its related mod ules and options The following components are included Power Supply PC 515 Electrometer Module PC 522 and PC 523 IEEE 488 Interface PC 517 CPU PC 518 Display Keyboard PC 514 A D Converter PC 520 Filter Multiplexer PC 521 The Model 619 is a versatile Electrometer Multimeter in tended for use independently or with programmed test and measurement systems Current sensitivity and input impe dance meet or exceed practical limits for most applications Figure 5 1 provides an overall operational view Section 7 contains schematic diagrams to aid in understanding circuit operation CPU Future Option 6800 E Isolator Microprocessor Digital Bus 40 lines Analog I 1 Power Bus n 1 1 I IEEE 488 Front Pane Isolation Interface and optional Display IFEE 488 Figure 5 1 5 2 POWER SUPPLY The Power Supply shown in Figure 5 2 is mounted on the cabinet left side as viewed from the front and consists of a PC board Shield 30450 and Rear Panel 30448 The Rear Panel contains the line fuse line cord plug and a series switch 5303 Refer to Schematic Diagram 30516 and 32004 in Section 7 AC power is provided to the Model 619 by the line plug filter P301 Transformer 301 and the fan receive power through the series circuit of fuse F301 and switches
151. one on GET see Figure 2 8 d T3 One Shot on GET After a GET command is ac cepted by the Model 619 it will initiate a conver sion The Model 619 will update the output data buffer once at the programmed reading rate see Figure 2 8 e T4 Continuous on X The same as Continuous on Talk except it is done on X see Figure 2 8 One Shot on X After an X command is accepted by the Model 619 it will initiate a conver sion The Model 619 will then update the output data buffer once at the programmed reading rate see Figure 2 8 g Pwr ON DCL SDC Default T Table 2 5 Function Function Command Auto 2nA 20nA 200nA 24A 204A 200g 2mA 20mA 2Amps EXT FEEDBACK Pwr ON DCL SDC Default R4 Will not autorange into these ranges EXT FEEDBACK is considered to be an Amps range and not an individual function 2 15 DATA FORMAT 1 D ASCII Data String The internal Model 619 priorities are such that ASCII data is passed to the interface after the display is updated same for Channels A and 2 D1 Binary Data String The internal Model 619 priorities are such that Binary data is passed to the interface before going to the display The display will be blank except for bus annunciators 2 16 ASCII FORMAT Channels and can be separately addressed to talk using secondary addresses a and b When the Model 619 is ad dressed to Talk it
152. op amp reference is biased at approximately 2 5 volts or minus full scale by VR501 as a negative reference and by resistors R501 2bk and KR501 39k Resistor R501 3 9k forms a current source due to the constant voltage across it It is equal to the voltage across R501 39k due to the feed back action of the op amp Ib is set to approximately the value of Vin max Rin Then Vin Vmax 0 Vin 0 Ib Vin Vmax 2 The charge balancing consists of an integrator a positive current source with a current switch and the negative signal current When U513 Pin 1 Signal integrate goes low Isig Signal Current flows out of the summing junction and ramps up to the threshold of the D flip flop therefore the current Icb Charge Balancing Current is turned on for one clock period Icb is slightly greater than Isig full scale The value of C502 which is the integrator capacitor prevents the output of the integrator from ramping below ground or above 5 volts U513A enables charge balance pulses only during Signal In tegrate 0503 prevents current limiting in the output of U507 op amp and clamps the output of the integrator to 5 volts to protect the D flip flop 0507 is a FET input amp that prevent any extra currents from flowing out of the summing junction during the instantaneous overloads as the charge balance pulses or signal current are switched OFF and ON R503 is a linearity resistor The nonline
153. or use on the line voltage marked on its rear panel The beeper is programmed to be operational and if the Model 6193 IEEE 488 Output is in stalled it will be set to the Addressable mode binary address 6 00110 NOTE The following procedure can be used to either confirm the factory setting or to set up the instrument for other modes of operation 2 3 PRE POWER UP PROGRAMMING The top cover of the Model 619 must be removed to check or change the LINE VOLTAGE LINE FREQUENCY and BEEPER switches To remove the top cover refer to Sec tion 6 Maintenance 2 4 POWER UP During power up all LED annunciators other than seven segment displays will momentarily light indicating they are functioning properly and the Model 619 will go to the default conditions given in paragraph 2 27 During power up the Model 619 will do a RAM test using test patterns If the RAM test fails the bad chip will be in dicated by a blinking annunciator as follows Low BYTE Low 1k RAM 1919 High BYTE Low 1k RAM 1920 Low BYTE High 1k RAM U922 RATIO High BYTE High 1k RAM 0923 During power up the Model 619 will do a cyclic redundance check CRC on its PROM memory If PROM test fails it will be indicated by blinking annunciators as follows CHANNEL CH B RATIO DIFF All Blinking During power up the Model 619 displays the current soft ware revision level and line frequency selected as follows Frequency Current Software D
154. ow Blow 250V 1 2A 3AG Molex Molex Molex Filter Power line Molex Male Molex Male Circuit Schematic PC Board Mfr Desig Description Location Item No Location Code 515 D5 515 E4 515 E4 515 E3 515 E3 515 E2 515 E2 515 E3 515 2 515 4 515 4 515 4 515 04 515 04 515 02 515 83 515 83 515 5 515 82 515 F4 5 9157 R243 515 A3 515765 515 B2 871 7500 103 HC9 11 11600 25 8P HC9 11 11600 25 8P Tap F010F200 Tap F010F200 Tap F010F200 9 F4 Tap F010F200 10 F5 HC SC 620 35 8P 11 5 HC SC 620 35 8P 12 64 HCP 11 6800 25 8P 13 64 Tap F00F200 14 65 010 200 5 17 4 18 64 19 65 P PF 40 21 A B 4 MOL 22 A B 4 MDL 09 50 3031 09 50 3031 09 52 3102 09 52 3102 2391 3 2391 3 Keithley Desig Part No C 22 01 C 314 11600 C 314 11600 C 179 10 C 179 10 C 179 10 C 179 10 C 309 620 C 309 620 C 314 6800 C 179 10 C 179 10 C0 7 RF 51 48 RF 46 FU 10 FU 4 CS 287 3 CS 287 3 CS 332 12 5 332 12 5 249 5 249 LF 2 CS 288 3 CS 288 3 Table 7 3 Power Supply PC 515 Parts List Cont Circuit Schematic PC Board Mfr Mfr Keithley Desig Description Location Item No Location Code Desig Part No R301 220k 10 Comp 515 D5 30 C4 R 2 220k R302 104 1 2W Comp 515 E4 31 04 R 1 1k R303 4 7k 5 1 4W Comp 515 32 F4 R 76 4 7k R304 470 10 1 2W Com
155. p 515 E4 33 F4 R 1 470 R305 4 5 1 4W Comp 515 2 34 F4 R 76 4 7k 5301 Switch 515 C2 37 84 SW 397 S302 Switch pPDT 515 C3 38 85 54 397 5303 Switch SPDT 82 39 A3 54 236 5304 Switch Power 1 SC 54 420 1301 Iransformor 515 D 2 3 4 5 42 0 4 5 TR 175 VR301 Voltage Regulator Negative 515 E3 45 F4 MC 7915 IC 174 VR302 Voltage Regulator Positive 515 E2 46 F4 MC 7815CT 16 96 VR303 Voltage Regulator 5 Volt 515 E3 47 65 109 10 98 Circuit Schematic PC Board Mfr Mfr Keithley Desig Description Location Item No Location Code Desig Part No 1 7 10 Table 7 4 IEEE Interface PC 517 Parts List C701 eluF SOV CerF 517 1 3 C4 8121 M050 C 237 651 104M C702 luF 50V CerF 517 1 4 C4 8121 M050 C 237 1 651 104M C703 luF 50V CerF 517 81 5 5 8121 M050 C 237 651 104M C 704 luF 50V Cerf 517 81 6 04 8121 050 C 237 651 104M C705 50V CerF 517 81 7 04 8121 50 C 237 651 104M C706 50V CerF 517 1 8 4 E 8121 050 C 237 651 104M C707 50V CerF 517 01 9 04 8121 050 C 237 651 104M 708 50V CerF 517 1 10 4 8121 050 C 237 651 104M C 709 50V Cerf 517 1 11 4 8121 050 C 237 651 104 C710 il CerF 517 1 12 4 8121 M050 C 237 651 104M C71 Cerr 517 C1 13 F5 8121 M050 C 237 651 104M C712 lOuF Alum 517 56 14 64 TAP F010 F200 C 314 10 C713 22uF 25V Alum 517 56 15 65 1503 10 336 C 3
156. r Panel MUT CHANNEL AMPS OHMS AUTO MANUA HANNEL RATIO C sau BINARY Durna rt ia omiy EXT uo ewig ON C aalt HE SOLUTION DIFFERINCHE tH MS DUOWNHANGI LI Cem as D on 1 Li Figure 2 2 Model 619 Front Panel Functions 2 2 In order for the Model 619 to accept ad dress or mode change the instrument must go through the power up cycle If the Model 619 is already on turn it OFF and then back to ON 2 7 READING RATE SELECTION When the Model 619 is in the Front Panel mode and the 51 digit resolution mode two different reading rates can be chosen via S5 2 41 rdg sec or S8 0 30 rdg sec See Table 2 6 To select the S5 reading rate refer to Section 6 Maintenance 2 8 OPERATING INSTRUCTIONS The basic operating instructions for the Model 619 are outlined in the following paragraphs Variations and more complicated measurements will be described later in this section 1 The Model 619 is provided with a three wire line cord which mates with third wire grounded receptacles WARNING Ground the instrument through a pro perly earth grounded receptacle before operation Failure to ground the instru ment can resuit in severe injury or death in the event of short circuit or malfunc tion In addition connect only to the line voltage selected Application of inco
157. ranged in two versions 1 In Amps the circuit is arranged as a current to voltage converter Various feedback resistances are used to measure a wide range of input currents 2 The circuit can also be arranged as a high input im pedance unity gain buffer which is utilized for both volts and ohms measurements When in the Ohms configu ration a constant current source consisting of a bootstrapped voltage reference and various feedback resistances is used to convert an unknown resistance to a measurable voltage level The input to the module is via a triax connector Separate binding posts and a microphone connector are provided for the 2 Amp current range and analog output respectively All input output connections along with a fuse are located on the rear panel of the module A calibrated resistive divider couples the module output to the input of an A D Converter at 200mV and 2V Power is supplied to the module via a transformer isolated floating power supply The logic for decoding and latching system commands to the Electrometer module are shown in the block diagram in Figure 5 3 5 3 1 Theory of Operation for the Model 6194 Electro meter Module NOTE When reading through the theory of opera tion for the Electrometer Module refer to Schematic Diagrams 30522D and 30523D located in Section 7 The Power and Control inputs are obtained by plugging the module P C edge connectors into the appropriate connec tors on the Mode
158. rite Control Register 1 Write MSB Register Write Timer 1 Latch Write MSB Register Write Timer 2 Latch Write MSB Register Writer Timer 3 Latch NOP NOP Read Status Register Read Timer 1 Counter Read LSB Register Read Timer 2 Counter Read LSB Register Read Timer 3 Counter Read LSB Register the control line buffering it buffers R W to form BVUA and BBA DMAGNT Direct Memory Access Grant for use by the Model 619 System All on board ROM memory decoding is done by U914A U903A 0904 U912 and 09108 U903A and U904A form the ROME ROM Enable signal This enables U914A the 2 or 4 decoder to select the appropriate deivce based on 11 Pin 2 and A12 Pin 3 of U914 The 6808 requires vectors from memory to branch to various sections of software These vectors must appear in locations FFF8 FFFF in the memory space The Vector JAM signal allows the top block of ROM to be double address for this purpose The top block responds to FFF8 FFFF as well as its normal address U912D and U912 perform the necessary ing function Therefore DSEL4 TP4 decodes memory spaces B89fj BFFF and E FFFF Signal DSEL1 decodes A8ff F memory space ROM U924 Signal DSEL2 TP2 decodes ABO AFFF memory space ROM 0915 Signal DSEL3 TP1 decodes 0 B7FF memory space ROM U907 The above process is used for 2716 memory devices Refer to Table 5 3 for selection
159. rnal Feedback 1 11 0101 FD B5 to 14A 1 11 0101 FD B5 104A to 1004 0 11 0101 7D 35 1mA to 10mA External Feedback 1 11 0101 FD B5 1A 1 10 0101 ED A5 AMPS ZERO CHECK to 14A 1 10 0101 ED A5 104A to 1004A 0 10 0101 6D 25 1mA to 10mA External Feedback 1 10 0101 ED A5 RANGE BYTE BYTE A D RANGE 1111 0111 F7 1111 0111 F7 1101 1101 DD 1111 1101 FD 1111 0011 F3 1111 0011 F3 1111 0011 F3 1111 0011 F3 1110 0111 E7 100Mohm 1110 0111 E7 OHMS 1Gohm 1100 1101 CD 10Gohm 1011 0111 B7 100Gohm 1001 1101 90 1000Fohm 1011 1101 BD Table 5 7 Electrometer Control Cont 1110 0111 E7 1110 0111 E7 1111 0011 F3 1111 0011 F3 1111 0011 F3 1111 0011 F3 0111 0111 77 0111 0111 77 1111 1110 FE External Feedback 1111 0111 F7 Range Disabled Bit D06 1 Range Byte control disabled 0 Range Byte control enabled Byte data is binary Data in parenthesis is in hexadecimal notation Table 5 8 Control Data Bit Designations RANGE BYTE K658 Ohms Reference K603 1 K601 Volts Ohms k662 X0 1 X0 01 Output K656 Voits Ohms K652 1Mohm 10kohm Feedback Zero Check Not Used K661 X1 Output K655 Amps Zero Check K653 100Mohm Feedback K659 ohms nput K660 X0 1 Output Voltage Limit Range Disable K654 10Gohm Feedback K657 10 Feedback K651 1000hm Feedback Relay Designation Refer to Schematics 30522D and 30523 5 19 5 2
160. rrect voltage can damage the in strument 2 Turn on the power by depressing the ON OFF push but ton in the lower left hand corner of the front panel see Figure 2 2 Allow one hour for warm up An additional hour may be required for temperature extremes Note that the rear panel power switch must also be in the ON position 3 Upon power up the Model 619 will go to the default con ditions and a beeper will sound for approximately two seconds The selected frequency and software revision level will also be momentarily displayed To change any of the default conditions refer to paragraph 2 27 Input connectors are located on the rear panel of the Model 6194 Electrometer Module The main input is in the triax connector with a separate input for the 2 Amp range An Analog Output is provided for convenience on a DIN con nector refer to Figure 2 2 Connect the measurement source to the input terminals and make the desired measurement See Table 2 1 for maximum input 2 9 FRONT PANEL FUNCTIONS The Model 619 Front Panel has two functional groups an Annunciator and Display Group and a Function Selector Group See Figure 2 2 Table 2 1 Maximum Input Function DCV Maximum Input 250V RMS DC to 60Hz sineware Range 200mV 2V 2 20 200 2 204A 2004 2mA 20mA 2A 250V RMS DC to 60Hz sineware 250V RMS DC to 60Hz sineware Fuse Protected 250V RMS DC to 60Hz
161. s INPUT is connected to the measurement The unit is switch selectable for guarded or unguarded operation the guarded mode of operation the outside conductor of the input connector is at input common as op posed to power line ground for the unguarded mode Note that the Adapter will reduce the input common mode voltage to a maximum of 30V RMS at DC to 60Hz Also a 1070 isolation resistance can be placed in series with the input by removal of an internal jumper This is for use in measurement of voltage sources which cannot tolerate the Model 6194 s 500kQinput impedance in zero check operation Figure 3 1 Model 6191 Guarded Adapter 3 3 MODEL 6193 IEEE STANDARD 488 OUTPUT The Model 6193 is an IEEE Standard 488 Bus Interface It permits the Model 619 to interface with any measurement system utilizing the IEEE Standard Bus The primary 5 bit address is selected by five switches on the rear panel of the Model 6193 This allows the selection of 31 primary listen or talk address pairs Binary 31 11111 is reserved for the Un talk and Unlisten commands The five rear panel switches are set at the factory for a primary address of binary 6 00110 The literature pertaining to the Model 6193 assumes that binary 6 is the primary address See Figure 3 2 Interface specifications including line commands parameters and response time are provided in the detailed specifications which precede Section 1 Address modes or Addr
162. sao MdL C Occ n 5 2 Electromoter Module Block Diagram sues ae orbe eee REIR 5 3 Data Bus iva ete AE X EO Paes bass 5 7 ESAE WEE ERE CNN Re E Ee RR pU Pe nb 5 10 isolator Board arid doo re dees re PIE Busse 6 2 Calibratio Cover a oes dE u Qua cp DADO yas deu asua tes MEAS 6 6 Supply Calibration 200IV eed EAE RA RACE Da eR KR UC us EROR es o bs 6 7 Supply 2 uut dots tied esa metus es bote Voc EOS mek ee ad 6 7 Range Calibration Z0 mM dae Oe OC ce EPOR SOLERE ON eC eii d c cic 6 7 Range Calibration a er RO OR vOv ek gam dues 6 8 Range Calibration 2060 vest 559 ev eee RR E Ep e eaa 6 8 Range Calibration 20810 isse x e EP Q uw KD ida ce RE ERE ES NE RAE ERN Ed t en 6 9 Calibration Fixture Schematic 6 10 Mode 6191 Guarded HRK ER 6 11 integrator QUIDUT WBVATOITIV usu c ox RAE TERIS AS ARCEM eS e Sor
163. sineware 2 0 20 0 200kQ 2MQ 20M9 200M9 200 2060 20060 210 2 9 1 Annunciator and Display Group The software or manually selected status of the Model 619 may be determined at any time by looking at the Annun ciators There are four Annunciator Groups Status Blocks A B C and D 1 Status Block A indicates the channel status as either Channel A Channel B Ratio A B or Difference A B 2 Status Block B indicates the status of other functions in cluding Zero Check Suppression Auto Range Filter Trigger Update and External Feedback 3 Status Block C indicates the IEEE 488 bus status as Remote Listen Talk SRQ Binary Talk Only or LLO 4 Status Block D indicates the measurement Volts Amps or Ohms The 8 Digit Display next to Status Block D indicates the measured value power and sign of the input to the Model 619 Electrometer Multimeter In addition to these Status Blocks status may also be determined by controller sampl ing through the IEEE 488 bus 2 9 2 Function Selector Group The Function Selector Group consists of seven blocks Dual Channel including Ratio and Difference Volts Amps Ohms Range Selection Zero Controls Baseline Controls Filter and Resolution NOTE Note that all front panel operations describ ed below except Ratio and Difference may be programmed or controlled from the IEEE 488 bus using the optional Model 6193 Interface In Remote or Manual mode the
164. ssuming With source resistance 100Mohm Over 1 minute un filtered self generated Tabie 6 2 Recommended Test Equipment Item Description DC Calibration 1 999999V 19 99999V 199 9999V 104 2 120k9 10k Step S Current Source Decade Resistor 110MQ 1M Step S 1069 R 289 10G Resistor R 289 100G Resistor Ohms Calibration 10060 106 1013 6 9 5 External Feedback has the following specifications TEMPERATURE MAXIMUM ACCURACY COEFFICIENT RANGE READING year 23 5 0 18 and 28 50 96rdg digits 96 rdg digits C External Feedback 1 9999 volts 0 0196 1d 0 002 0 3d 9 External Feedback range requires user supplied feedback element for current to voltage conversion resistor charge to voltage conversion capacitor etc Accuracy Temperature Coefficient specifications are in addition to but not including that of feedback element Feedback ele ment is connected from the Analog Output to the Module 0 002 or 20ppm 0 01 Valhalla 50 5 50ppm 1000ppm K I SR 1010 SR 1050 1000ppm K I Guideline Input NMRR Noise and Analog Settling Times will be a function of the feedback element Displayed reading is the voltage across the External Feedback element Accuracy Specifications Assume With input offset corrected by Zero Correct function after warmup and every 24 hours thereafter Correct whenever dT gt 1 Spec exclusive of nois
165. stability and of a suitable dielectric material to ensure low leakage and low dielectric absorption Polystyrene and polypropylene dielectric capacitors offer good performance in this regard As shown in Figure 2 5 an external Zero Check contact may be desirable in certain applications where 0 5MQ Zero Check input impedance cannot be tolerated protects this contact from the discharge surge of Care should be ex ercised in the selection of this contact Switch or relay that the high impedance low current requirements of the cir cuitry are not compromised CHARGE n INPUT 10 EXTERNAL ZERO CHECK RLIMIT ANALOG OUTPUT 6194 ECTROMETER Iki TO A D CONVERTER 3l iCHASSIS Figure 2 5 Charge Measurement 2 10 3 Logarithmic Currents The use of a diode junction in the external feedback path permits a logarithmic current to voltage conversion This relationship for a junction diode can be given by the equation V In 1 10 IR where q unit charge 1 6022 10 9 k Boltzmann s constant 1 3806x1023J 9K T Temperature K The limitations in this equation center on the factors m and R l is the extrapolated current for V 0 An empirical proportional constant m accounts for the different character of current conduction i e recombination and diffusion mechanisms within the junction typically varying in value between 1 and 2 Finally R
166. store 0 1 2 3 4 5 6 7 8 D104 through D101 NOTE Data Codes 0106 0 see Table 2 16 Table 2 15 Data Codes Normal OVERFLOW DIFFERENCE RATIO Buffer Full D104 through D101 2 19 Table 2 16 Byte Definitions Byte Zero Correct Byte 1 Filter Zero Correct off 20 chA f Filter off Zero Correct on 71 1 Filter on chB Same as chB Same as chA Byte 2 Zero Check Byte 3 Function Zero Check off C i Volts F 1 Zero Check on C1 1 Amps F1 Ohms F2 Same as chA Same as chA Byte 4 Range Autorange Non 580 M Range SRQ M1 Range 2 Range 3 Same as Range 4 Range 5 Range 6 Range 7 Range 8 Range 9 Range 1 Same as Byte 7 Data ASCII 00 Binary D1 Same as Q C L Co to t Q 00 A C MX chB Same as 2 20 Table 2 16 Byte Definitions Cont Byte 8 Trigger Continuous Talk 0 One Shot on Talk 1 Continuous on Get T2 One Shot on Get T3 Continuous on X T4 One Shot on X T5 4 2 Mm il chB Same as 10 Baseline Suppress Suppress off Up Suppress on 00 Same as 12 Int Period 16 66ms 4 115
167. t the rear carefully lift it off the instrument 4 Instali the Calibration Cover on the Model 619 6 14 CALIBRATION ADJUSTMENTS The sequence of calibration adjustments is as follows 1 Input amplifier zero 2 A D reference supply calibration 3 Multiplier calibration 4 Amps calibration Ohms reference calibration Perform the following procedures and make the ad justments indicated to calibrate the Model 619 The location of the calibration pots is indicated on the Model 6195 Calibration Cover see Figure 6 2 1 Input Amplifier Zero Place the instrument in Zero Check Channel A Volts and Manual ranging Should the instrument have only one Electrometer module it must be located in position Channel A Set the Model 619 to the 200mV range and adjust R656 for a display reading of 0 00 3 within 1 count NOTE Zero Correct should not be used prior to this step 2 200mV A D Reference Supply Calibration Using the DC Calibrator and 10 1 divider apply 190 00mV to the input of the Electrometer After actuating the Zero Cor rect release the Zero Check and adjust R411 for a display reading of 190 00 3 to within 1 count Refer to Figure 6 3 3 2 Volt A D Reference Supply Calibration Uprange the Model 619 to the 2 Volt range and apply 1 9000 Volts to its input Adjust R415 for a display reading of 1 9000 0 to within 1 count Refer to Figure 6 4 6 5 R411 200MV A D REFERENCE A
168. tegration periods for S1 S2 and S3 are for 60Hz line operation These are changed to 20msec integration periods for 50Hz For measurement mode 50 50 60Hz integration period is 4 1msec Switch 801 51 on the Isolator board con figures A D timing appropriate for 50 60Hz Following a range change or channel changes two addi tional integration periods are required for update of zero and calibration At sufficiently high trigger rates autozero and autocalibrate phases are bypassed When a trigger is given the A D will do a signal integrate and then autozero and autocalibrate If the trigger is given before it can autozero and autocalibrate it will do a signal integrate Therefore if trigger is given at a faster rate autozero and autocalibrate will be bypassed In the Ag measurement modes the front panel push button switches will not respond The LLO annunciator will turn on and the display goes blank except for the bus annunciators 2 22 FILTER 1 Pf The filter is disabled 2 P1 The filter is enabled 3 Pwr ON DCL SDC default 2 23 ZERO CHECK Each channel has either Zero Check ON or OFF not func tion dependent just channel dependent 1 CQ The Model 619 is not in Zero Check 2 C1 The Model 619 is in Zero Check 3 Pwr ON DCL SDC default C1 2 24 ZERO CORRECT 1 Z Zero Correct table is not updated 2 Z1 Update Zero Correct table 3 Pwr ON DCL SDC default 20 2 16 There are 6
169. tement used to enter the remote mode i e REN and Address must not contain any other commands The Model 619 must be in the remote mode to be programmed If it is 2 10 not in the remote mode the first arguments preceding the remote mode will not program the Model 619 and will cause rN to be displayed The Model 619 front panel push button switches will respond unless LLO is commanded through the bus Pressing the RATIO button initiates a conversion s if a trigger is being awaited by the Model 619 the RATIO button is a manual trigger dur ing bus operation After programming the front panel does not reflect the new configuration until the Model 619 is triggered Table 2 4 Secondary Address FUNCTION Channel A LISTEN Channel A TALK Channel B LISTEN Channel B TALK SRQ TALK Status Request A TALK Status Request B TALK 2 Interface Clear IFC Clears the Interface and goes to talker listener idle states There are no state function range etc changes in the Model 619 3 Service Request SRQ Requests serial poll service 4 End EOI Asserted during last byte of multi byte data transfer b Attention ATN Asserted when address or commands are present on the bus 2 14 1 Bus Commands Implemented 1 Universa Commands A Device Clear DCL The Model 619 goes to default conditions see paragraph 2 27 B Local Lock Out LLO If LLO is given the front panel controls cannot ca
170. ter nate test equipment may be used However the accuracy of the alternate test equipment must meet specifications listed below Voltage Sources 20 190 0000mV 1 999999V 19 99999V 199 9999V Current Sources 200ppm 19 000mA 190 004A 1 90005A 19 000nA Calibration Resistance 19kQ 100ppm 1960 1000ppm 6 7 INFORMATION AND ASSUMPTIONS 6 7 1 Standards Maximum Allowable Input Input overload source must be noninductive with a capacitive component less than 5000pF Isolation Input LO to power line ground gt 100Mohm shunted by approximately 750pF A D Converter common to Electrometer Module Input lt 0 Input Stability Stable with lt 5000pF input to input common and or guard analog output in Volts or and analog output to input common Ranging Manual or Automatic in Talk Only mode Manual in Addressable mode Range exponents are multiples of three 0 3 6 9 12 15 18 Weight Model 6194 Electrometer 116 1202 0 81kg 6193 IEEE 488 Interface 6 50z 0 18kg Model 6191 Guarded Adapter 502 0 18kg Maximum Allowable Common Mode Slew Rate 10 volts sec with no loss of data or commands across isolator Analog Output Characteristics Voltage Vau 1mV Current V l x Rfeedback 1 200mV F S 2nA 200nA 204A 2mA ranges 2 Volt F S on 20nA 24A 2004A 20mA ranges Resistance V uR x 1mV Output sa
171. the instrument specifications additional allowance must be made in the readings obtained 4 1 2 Environmental Conditions All measurements should be made at an ambient tempera ture within the range of 18 to 28 65 to 82 F and a relative humidity of less than 7096 4 2 MODEL 619 PERFORMANCE VERIFICATION Use the following procedures to verify the basic accuracy of the Model 619 If the instrument is out of specification at any point a complete calibration may be performed as described in Section 6 However if the instrument is still under warranty contact your Keithley representative or the factory immediately NOTE Performance verification should be perform ed by qualified personnel using accurate test equipment with current calibration and traceability 4 2 1 Initial Conditions Before beginning the verification procedure the instrument must meet the following conditions 1 If the instrument has been subjected to extremes of temperature allow sufficient time for internal temperature to reach normal operating environmental conditions specified in paragraph 4 1 3 Typically it takes one hour to stabilize a unit that is 10 C 18 F out of the specified temperature range 2 Turn on the Model 619 and allow it to warm up for one hour WARNING Some procedures require the use of high voltage Take care to prevent con tact with high potential circuits which could cause electrical shock resulting in injury or deat
172. tion Item No Location Code Desig Part No NAT u406 Quad Comparator 521 Several 90 03 LM339 IC 219 1407 Nuad Comparator 521 Several 91 03 NAT LM339 16 219 140 Flip Flop 521 5 92 4 7415374 IC 242 1409 Flip flop 521 05 93 E3 7415374 16 242 1410 Triple 3 Input 5217 65 94 4 741510 16 155 401 Jumper 52 0 3 8402 Jumper 521 02 MES W403 CR401 6 3V Zener Diode 521 63 QoS 1N4577 CR402 6 3V Zener Diode 521 64 100 53 C 1N4577 02 58 CR403 5 1V Zener Diode 521 1 101 03 1 7 51 07 59 CR404 silicon Diode 521 4 102 E3 13914 28 CR405 Silicon Diode 521 2 103 F2 14914 RF 28 CR406 Silicon Diode 521 82 104 F2 1N914 RF 28 CRAO Silicon Diode 521 14 105 1N914 RF 28 CR408 Silicon Diode 521 2 106 F3 IND RF 28 7 29 Table 7 10 Fan Assembly Parts List Desig Description Location Item No Location Code Desig Power Connection FAN Fan Assembly Fan Suppport Bracket Filter Support Filter Grommet Strip Tape Cuttinq Foam Strips Lug The Fan Filter rust he kept clean Dirt in the filter will impede the air flow through the Model 619 and cause overheating Tt is recommended to periodically remove the filter and use compressed air to cloan it 7 30 Keithley Part No CS 325 2 FN 7 30460C 304548 30458A FL 3 284 79 4 30858 1 TP 6 8 LU 89 Z L LE L 2
173. to 1 9059 18 943 to 19 057 189 73 to 190 27 1 8976 to 1 9024 18 973 to 19 027 189 76 to 190 24 1 8973 to 1 9027 18 976 to 19 024 1 8973 to 1 9027 These display readings take into account the possible er rors that may generated using the input sources listed in paragraph 4 1 2 When using the 2A range the input must be applied to the terminals designated as 2 AMPS MAX INPUT 1 8966 to 1 9034 18 969 to 19 031 189 73 to 190 27 1 8976 to 1 9024 18 943 to 190 57 189 46 to 190 54 1 8946 to 1 9054 18 847 to 1 9153 183 91 to 196 09 1 3800 to 1 6200 These display readings take into account the errors that may be generated using the input sources listed in paragraph 4 1 2 shield r i Triax Cable 6194 Electrometer Input Resistance Source Figure 4 1 Resistance Source Shielding shield nra ied CAES 1 Guard _ 4 T Triax Cable l l EE i J b Isl Z ul Resistance Source Pin 1 Unity Gain Analog Pin 2 Output Figure 4 2 Resistance Source Shiedling and Guarding 6191 Guarded 10 Input Adapter To 6194 Electrometer Input Guarded To 6194 Resistance Source Electrometer Analog Output Figure 4 3 Measuring Resistance Sources Using Model 6191 4 3 4 4 SECTION 5 THEORY OF OPERATION 5 1 INTRODUCTION This section contai
174. until it has data for the processor at certain essential times during the conversion The Event Counter is a 16 bit binary counter that is used in two modes The first mode is to count the number of charge balance pulses during Signal Integrate The second mode is to count the 5MHz clock during the ramp down of the Single Slope Using the 5MHz clock in this manner makes one Single Slope count equal to 1 1024 of charge balance counts The resolution is thereby increased The output of this counter is multiplexed to the Data In Bus and then to the processor 8 bits at a time The Integration Time Counter consists of an 8 bit prescaler counter U505 and an 8 bit programmable down counter U509 and U510 U505 receives its input from the lowest fre quency tap of the oscillator divider U505 drives U510 and therefore U509 with a frequency of 1200Hz U509 and U510 are loaded from the processor Thus the integration time can be programmed in increments of 833 microseconds This is convenient for integration periods of 16 66msec or 20msec The Control Bit Latch register U517 holds the control bits to set up the various control and data paths on this board 1 LS byte A turns on the tri state buffer U512 onto the Data In Bus 2 Bit 1 MS byte turns on the tri state buffer U519 on to the Data in Bus 3 Bit 2 Single Slope A1 starts slope and remains at logic level 1 during the complete ramp down The counting and the rampin
175. upply during input voltage overload in either volts or ohms The drive to the output circuit is provided by the bootstrap ped amplifier U651 on PC 523 and via Pin 56 on the in tramodule bus R607 R609 CR613 and CR614 provide extra drive current to Q601 and Q602 when the circuit is operating near the 260V supply voltage levels CR601 and CR603 protect the emitter base junctions of transistors Q601 and Q602 from reverse voltage bias Controlling the configuration of the output circuitry arc he relays K601 and K602 These two relays are actuated by R611 R610 0607 0608 along with commutation diodes CR623 and CR622 Control is provided via Pin 52 on the intramodule bus from logic decoders on PC 523 K601 sets up the output for both Volts and Ohms functions pro viding for a on inverting gain K602 sets up the output for the Amps function by providing for an inverting gain con version The remaining circuitry PC 522 includes the 2 Amp rent range shunt resistance R605 The 2 Amp range has separate binding post inputs J601 and J602 and fuse pro tection F601 Relay K603 along with commutation diode CR621 selects this range for connection to the module out put Control is provided from logic decoders on PC 523 via Pin 52 on the intramodule bus Fuse F601 provides overload protection and is mounted for access on the rear panel of the module The rest of the Electrometer module circuitry is located on PC 523 The
176. ure separately through the READ command and they are separately switched into the A D Converter Channel B is an option Ratio A B takes a ratio of the two channels always dividing A by B Difference A B subtracts the electrometer value of Chan nel from Channel A A beeper sounds whenever a front panel push button switch command is given The beeper is enabled by Switch 1 on the Isolator Board The Model 6191 Guarded Adapter in the guarded switch position reduces the effect of additional input cable capacitance see paragraph 2 2 1 3 WARRANTY INFORMATION Warranty information is given on the inside front cover of this instruction manual If there is a need to exercise the warranty contact the Keithley representative in your area to determine the proper action to be taken Keithley maintains service facilities in the United Kingdom and West Germany as well as in the United States Check the inside front cover of this manual for addresses The Model 619 and its installed options can be returned to Keithley for repair and calibration Also the Model 619 op tions Models 6191 6193 6194 and 7008 can be returned to the factory without the basic Model 619 Information for returning the Model 619 and or its options is given on the inside front cover of this instruction manual 1 4 MANUAL ADDENDA improvements or changes to this manual will be explained on an addendum attached to the inside back cover 1 5 SAFETY SYMB
177. use a change in status in the Model 619 The LLO annunciator will light when in LLO C Serial Poll Disable SPD Disables serial polling D Serial Pol Enable SPE When addressed to Talk the Model 619 will send the SRO status word E Untalk UNT Puts the Model 619 into a talker idle state if it was a talker F Unlisten UNL Puts the Model 619 into a listener idle state if it was a listener 2 Address Commands A Selected Device Clear SDC If the Model 619 is ad dressed to listen it will go to default conditions B Group Execute Trigger GET If the Model 619 is ad dressed to listen and in the proper trigger mode T2 or it will automatically trigger a conversion 2 14 2 Input Channel Control Secondary Address is a or b 1 Channel input Channels A and B can be separately ad dressed and controlled using secondary addressing Each input channel has several internal status words which define the current operating status of the channel When addressed to Talk the status words define the function range and mode of operation by which the data will be accepted The status words can be modified by the following device dependent commands sent via the bus see Status Section fn order to program Channel A or Channel B the machine must be in Remote mode 2 Device Dependent Commands The following device dependent commands apply to either Channel A or Channel B as defined by the secondary address Any or
178. user please describe below Be sure to include your name and phone number on this service form
179. vents a random and erroneous con figuration of the Electrometer module by power up tran sients Additional logic prevents erroneous simultaneous actuation of relays which could result in damage to the module Capacitors C666 through C668 prevent noise pickup and subsequent erroneous relay actuation 5 4 MODEL 6193 IEEE 488 INTERFACE BOARD The IEEE 488 Interface Board utilizes the Motorola 68488 IEEE which is capable of performing all IEEE Talker Listener protocols The board was designed to be interrupt driven 1 device The board contains Motorola 3448A IEEE bus transceivers which are capable of driving and terminating the IEEE bus lines per the IEEE 488 specifications A rear panel accessible address switch is on the board for choosing an IEEE Talk Listener pair address for the Model 619 The IEEE connector is on the rear panel An Interface Bus Cable Model 7008 six feet 2 meters in length is pro vided with the Model 6193 module The five bit Interface address is back panel selectable The address switches are preset prior to shipment to primary address of binary 6 00110 5 4 1 IEEE Interface Board Theory of Operation NOTE When reading the theory of operation for the IEEE Interface Board refer to associated block diagrams and Schematic Diagram 30518 for reference designations The Model 6193 IEEE Interface is built around the Motorola 68488 IEEE LSI device U706 The 68488 is a Motorola 6800 family p
180. will transmit the current contents of its output data buffer as a 16 to 18 byte ASCII string The ac length of the ASCII string depends on the number of programmed terminators Refer to Figures 2 9 and 2 10 and Tables 2 7 through 2 9 2 17 BINARY FORMAT Refer to Figure 2 11 1 In the binary data mode the Binary annunciator will turn ON and the display becomes blank except for the bus an nunciators 2 11 e LISTEN UNLISTEN TALK 7 SEGMENT DISC TALK BUS PROGRAMMING X READ DATA READ DATA P WILL READ SIG 2 TALK WILL NN ABORT READ SIG 1 i os TE ABORT TALK WILL READ SIG 1 TALK WILL ABORT READ 516 2 NN Nc ZERO ES zm cn zo EM 2 zm eI LISTEN UNLISTEN TALK TALK PROGRAMMING T X TALK WILL READ 516 1 TALK WILL READ SIG 2 gne zeno Tee ae ses caf GET SRO TALK WILL READ SIG 1 TALK WILL READ SIG 1 TALK GET SRQ LISTEN UNLISTEN PROGRAMMING o TALK WILL READ SIG 1 TALK WILL READ SIG 4 ES I Tem II T4 TALK WILL READ SIG 1 TALK WILL READ SIG 1 CAL SIG 1 CAL ZERO CAL zERO CAL ZERO CAL ZERO CAL ZERO Phase to run depends on ptevious abort or power up EXECUTE Reading held in comminucations buffer until taken by Bus only then will a new reading be stuffed Figure 2 8 Timing Diagram Table 2 7

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