Keithley 2701

2-38 Close/Open Switching Module Channels Model 2701 User’s Manual
Figure 2-12
Model 7700 simplified schematic
Notes:
Cold Junction
Ref x3
Channel 1
HI
LO
Channel 10
HI
LO
(Channels 2–9)
Channel 11
HI
LO
Channel 20
HI
LO
(Channels 12–19)
Channel 21
HI
LO
Channel 22
HI
LO
AMPS
HI
LO
Sense
HI
LO
Input
Channel 23
2-Pole (Open)
4-Pole (Closed)
(See Note)
3A
3A
To
Model 2701
Backplane
Channel 25
(See Note)
Backplane
Isolation
Channel 24
(See Note)
Backplane
Isolation
Channels 23 and 25 in this schematic refer to the
designations used for control and are not actual
available measurement channels.
AMPS
LO
Sense
HI
LO
Input
HI
LO
Cold Junction
Ref x3
If the module is not to be internally connected
to the DMM, channels 24 and 25 can be opened
using multiple channel operation.