Keithley 2750 Service Manual

Model 2750 Multimeter/Switch System Service Manual Troubleshooting 4-21
Troubleshooting
Tab le 4- 11
4 dry circuit reference signal switching
Range Q159 Q158 Q157 U133/0.7V U133/7V Q123 Q125
1
10
100
1k
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
Range Q124 Q126 K104* U133/9 Q171 U208/9 U208/16
1
10
100
1k
OFF
OFF
ON
ON
OFF
OFF
ON
ON
SET
SET
SET
SET
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
*K104 set states: Pin 8 switched to Pin 7
Pin 3 switched to Pin 4
Tab le 4- 12
DCA signal switching
Range K103
20mA
100mA
1A
3A
Set
Reset
Reset
Reset
K103 set states: Pin 8 to 7
Pin 3 to 4
K103 reset states: Pin 8 to 9
Pin 3 to 2
Tab le 4- 13
ACA signal switching
Range K103
U105
Pin 16
U105
Pin 1
U111
Pin 16
U105
Pin 8
U103
Pin 16
U103
Pin 1
1A
3A
Reset
Reset
ON
ON
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
K103 set states: Pin 8 to 7
Pin 3 to 4
K103 reset states: Pin 8 to 9
Pin 3 to 2

Keithley 2750 Specifications

General

Interface	GPIB, RS-232, Ethernet
Switching Speed	Up to 500 channels/second
Maximum Voltage	300V
Operating Temperature	0°C to 50°C
Measurement Functions	DCV, ACV, DCI, ACI, 2-wire Resistance, 4-wire Resistance, Frequency, Temperature
Resolution	6.5 digits
Current	1A
Maximum Current	1A