2-Wire Functions - Keithley 2701 User Manual

2-8 Close/Open Switching Module Channels

2-wire functions

Figure 2-1 shows an example of how the system channel is connected to the DMM Input
of the Model 2701. Assume a Model 7700 switching module is installed in slot 1 of the
mainframe. When channel 101 is closed using the system channel close keys, both the
Channel 1 relay and the backplane isolation relay (Channel 25) close to connect the
channel to the DMM. The complete simplified schematic of the Model 7700 is provided in
Figure 2-12.
Figure 2-1
2-wire system channel connections to Model 2701 DMM
Channel 1
System channel operation:
Close channel 101
Model 7700 Switching Module
Channel 1
Relay
HI
LO
Model 2701
Channel 25
Backplane
Isolation
Relay
Model 2701 User's Manual
Slot 1
DMM
HI
Input
LO