Keithley 2700 Service Manual

4 Troubleshooting
Table 4-1 Power supply components ...................................................... 4-5
Table 4-2 Display board checks ............................................................ 4-11
Table 4-3 Power supply checks .............................................................4-11
Table 4-4 Digital circuitry checks .........................................................4-12
Table 4-5 DCV signal switching ........................................................... 4-13
Table 4-6 ACV and FREQ signal switching ......................................... 4-13
Table 4-7 Ω 2 signal switching .............................................................. 4-14
Table 4-8 Ω 4 signal switching .............................................................. 4-14
Table 4-9 Ω 2/ Ω 4 reference switching ................................................... 4-14
Table 4-10 DCA signal switching ........................................................... 4-15
Table 4-11 ACA signal switching ........................................................... 4-15
Table 4-12 DCV signal multiplexing and gain ....................................... 4-16
Table 4-13 ACV and ACA signal multiplexing and gain ........................ 4-16
Table 4-14 DCA signal multiplexing and gain ....................................... 4-16
Table 4-15
Ω 2 signal multiplexing and gain ........................................... 4-17
Table 4-16 Ω 4 signal multiplexing and gain ........................................... 4-17
Table 4-17 Switching device locations ................................................... 4-17
5 Disassembly
Table 5-1 Input terminal wire colors ....................................................... 5-7
Table 5-2 Power module wire colors ...................................................... 5-7
6 Replaceable Parts
Table 6-1 Model 2700 motherboard parts list .........................................6-3
Table 6-2 Model 2700 display board parts list ........................................ 6-8
Table 6-3 Model 2700 connector board parts list ................................... 6-9
Table 6-4 Model 2700 miscellaneous parts list ..................................... 6-10
Table 6-5 Model 7700 parts list ............................................................ 6-11
Table 6-6 Model 7702 parts list ............................................................ 6-12
Table 6-7 Model 7703 parts list ............................................................ 6-13
Table 6-8 Model 7705 parts list ............................................................ 6-14
B Calibration Reference
Table B-1 Remote calibration command summary ................................ B-2
Table B-2 DC calibration commands ..................................................... B-8
Table B-3 AC calibration commands .................................................... B-13
Table B-4 Model 7700 calibration commands ...................................... B-16
Table B-5 Calibration error summary ................................................... B-21
2700ServiceLOT.fm Page 9 Monday, March 13, 2000 11:53 AM

Keithley 2700 Specifications

General

Type	Digital Multimeter
Measurement Functions	DC Voltage, AC Voltage, DC Current, AC Current, Resistance, Frequency, Temperature
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Frequency Range	3 Hz to 500 kHz
Temperature Range	-200°C to +1372°C
Display	Vacuum Fluorescent Display
Connectivity	IEEE-488, RS-232
Channels	10
Power Supply	100V to 240V AC, 45Hz to 66Hz
DC Current Range	10 µA to 3 A
AC Current Range	10 µA to 3 A
Temperature Measurement	Thermocouple, RTD