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Summary of Contents for 1792

Page 1: ...INSTRUCTION MAdUAL Models 1792 6422 Isolated BCD Outputs Keithley instruments Inc 28775 Aurora Road Cleveland Ohio 44139 216 248 0400...

Page 2: ...ness for a par ticular use Keithley Instruments Inc shall not be liable for any indirect special or consequential damages STATEMENT OF CALIBRATION This instrument has been inspected and tested in acco...

Page 3: ...MODELS 1792 6422 I SOLATED BCD OUTPUTS Copyright 1979 Keithley Instruments Inc Third Printing May 1981 Cleveland Ohio U S A Document No 30155 Rev B...

Page 4: ...N 3 l 3 3 OVERALL OPERATION 3 l 3 9 CIRCUIT DESCRIPTION 3 3 3 11 Control Circuitry 3 3 3 14 Switching Circuitry 3 4 3 16 Isolator Network 3 4 3 18 Busy Hold Circuit 3 4 3 20 Output Registers And Buffe...

Page 5: ...and above Model 179 20A DMFl all Serial Numbers Model 177 DMM Serial Nunber 14500 and above Model 480 Picoammeter Serial Nunber 12000 and above Note First 3 l 2 digits at BCD auf put same as Model 480...

Page 6: ...er Adds 0 2kg 0 51 bs Precludes Mode I 1788 battery pack installation ASSESSORIES AVAILABLE Model 1796 10 ou t put mating cable one end unter minated Model 1797 10 intercon nect cable to 750 7502 prin...

Page 7: ...PC 498 301658 b Shield 301328 5 Output Cable assembly with back panel and strain rel iefs I Cable assembly 302348 l 2 Back panel 301318 3 Two strain reliefs 27686A Mounting Hardware d I Eight Standoff...

Page 8: ...NITIAL PREPARATION MODELS 1792 6422 CARD EDGE CONNECTOR PIN 2 TOP PIN 1 UNDERNEATH Model 1792 I I P1 08 PL GROUNF CLIP 1 ASTIC SPACER 4 PLACES 1792 0023 A FIGURE 2 l Installation of Model 1792 2 2...

Page 9: ...del 1792 in the instrument so that it rests on the plastic spacers The ground clip must make contact with the upper side of the shield on the Model 1792 h 0 Install the top cover that was shipped with...

Page 10: ...8 to 51013 on the mother board After making the connection place the printed circuit board outside of the Model 642 so that there is no strain on the cable and the board will be out of the way during...

Page 11: ...MODELS 1792 6422 INITIAL PREPARATION MODI F I ED PC 498 30165B STANDOFF 8 MAINFRAME 6422 0032 B ASSEMBLY FIGURE 2 2 Installation of Model 6422 2 5...

Page 12: ...BLE WIRE NO AND COLOR CS 27 1 PIN NO 1 BRN 9 2 RED 14 3 ORN 15 4 YEL 13 5 GRN 2 6 BLUE 18 7 VI0 37 8 GRAY 19 9 WHT 22 10 BLK 5 11 BRN 23 12 RED 6 13 ORN 39 14 YEL 38 15 GRN 41 16 BLUE 40 17 VI0 24 18...

Page 13: ...he Model 1792 6422 in block diagram form The 1792 6422 operates by first con verting multiplexed BCO input data into synchronous serial data Serial data is then transmitted across to conserve power 3...

Page 14: ...SY I I L 4 380 mSEC I 3 I I I I HOLD 7 sl I 4 2p SEC MIN d t 20DnSEC iii hi DON T CARE I I I c 5v I 4 20 mSEC COMMON I l I FLAG I 11 1 I I 1 I I I 1 SYNC II I I I 1 I I I I I I 1 I SHIFT CLOCK I au f...

Page 15: ...setting it to 2 on each pulse Th 1s ensures synchronous long term operation 3 13 A simpl i fled schematic of the ring counter and gating Is given in Figure 3 3 Each STROBE pulse enables the transfer o...

Page 16: ...nd their associated biasing resistors The isolators provide 101oD isolation and are normally off to conserve power The transistors invert the pulses and serve both as wave shapers and low impedance bu...

Page 17: ...isplay information is available at the oufput card edge connector in a buffered parallel BCD format 3 22 DC to DC Converter 3 23 The 1OOkHz clock is buffered by U410 and applied to switching transisto...

Page 18: ...a i ners Typically they wil I be received in metal tubes or static protective foam Keep the devices in their original containers until ready for use C Remove the devices from their protective con taln...

Page 19: ...n a Equipment Model Number b Part Description c Circuit Designation if applicable d Keithley Part Number 4 5 SCHEMATIC 4 6 Model 1792 6422 BCD Option Schematic No 29965D page 4 4 4 7 COFPDNENT LAYOUT...

Page 20: ...3904 TG47 Transistor NPN Silicon D 2 F 4 T l 2N3904 TG47 Transistor NPN Silicon C l D 5 T l 2N3904 TG 47 lOKD t5 1 4W CarbF E 6 D 3 MEP CR25 R 76 10K lOOKR 5 1 4W CarbF E 5 F 4 MEP CR2 5 R 76 1OOK lOK...

Page 21: ...lnverter ABCD 1 2 3 5 D 5 RCA IC CMOS Dual 4 Stage Static Shift Reg i ster CD 3 E 5 RCA IC CMOS Dual 4 Input NOR Gate B 4 A 5 E 5 RCA IC CMOS Quad Analog Digital Switch C 5 F 5 NAT IC CMOS Presettabl...

Page 22: ...Sxa u il l m 8 Z 1 I 4 4...

Page 23: ...P VI...

Page 24: ...ments 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 Va...

Page 25: ...ading Berkshire RG 2 ONL 0734 86 l 2 87 88 Telex 84 7047 FRANCE Keithley Instruments SARL 2 Bis Rue Leon Blum B P 60 91 121 Palaiseau Cedex 6 01 1 51 55 I Telex 600 933 NETHERLANDS Keithley Instrument...

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