Keithley 2015, Service Manual, Page: 84 / 158

Troubleshooting 4-21
Analog signal switching states
Tables 4-5 through 4-11 provide switching states of the various relays, FETs, and analog
switches for the basic measurement functions and ranges. These tables can be used to assist in
tracing an analog signal from the input to the A/D multiplexer.
Table 4-5
DCV signal switching
Table 4-6
ACV and FREQ signal switching
Range Q101 Q102 Q114 Q136 Q109 K101* Q113 Q105 Q104 Q108 Q121
100mV
1V
10V
100V
1000V ON
ON
ON
OFF
OFF ON
ON
ON
OFF
OFF OFF
OFF
OFF
ON
ON OFF
OFF
OFF
ON
ON OFF
OFF
OFF
OFF
OFF SET
SET
SET
SET
SET OFF
OFF
OFF
OFF
OFF OFF
OFF
OFF
OFF
OFF ON
ON
ON
OFF
OFF OFF
OFF
OFF
ON
ON ON
ON
ON
ON
ON
* K101 set states:
Pin 8 switched to Pin 7
Pin 3 switched to Pin 4
Range Q101 Q102 K101* K102*
U103
pin 8 U103
pin 9 U105
pin 9 U105
pin 8 U103
pin 16 U103
pin 1 U105
pin 1 U111
pin 16
100mV
1V
10V
100V
750V ON
ON
ON
ON
ON ON
ON
ON
ON
ON RESET
RESET
RESET
RESET
RESET RESET
RESET
SET
SET
SET ON
ON
OFF
OFF
OFF ON
ON
OFF
OFF
OFF OFF
OFF
ON
ON
ON OFF
OFF
OFF
OFF
ON OFF
ON
OFF
ON
OFF ON
OFF
ON
OFF
OFF ON
OFF
ON
OFF
OFF OFF
OFF
OFF
OFF
OFF
* K101 and K102 reset states:
K101 and K102 set states:
Pin 8 switched to Pin 9
Pin 3 switched to Pin 2
Pin 8 switched to Pin 7
Pin 3 switched to Pin 4