Plug-In Switching Modules - Keithley 2750 User Manual

1-6 Getting Started
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Plug-in switching modules

Up to five Keithley Model 77XX series switching modules can be installed in the Model
2750. A side-by-side comparison of the switching modules is provided in
Basic close/open operation for switching module channels is provided in
while scanning is covered in
switching module is provided in
tion information is provided in the packing list that was shipped with each switching
module.
Table 1-1
Model 77XX series switching modules
Model 7700
2-pole operation
20 channels
4-pole operation
10 channel pairs
1-pole operation
N/A
Measure volts
300V Max
Measure amps
Ch 21 and 22,
3A Max
Measure ohms
2/4-wire
Cold junction
Yes
for thermo-
couples
1
Relay type
Latching elec-
tromechanical
Connector type
Oversized screw
terminals
2
Configuration
Multiplexer
Unique features
All DMM
functions
Digital I/O port — Five digital limit test output lines to control external circuitry.
The digital trigger link and hardware interlock input can also be accessed at this
port.
Monitor — The Model 2750 can monitor a selected channel. A scan can be trig-
gered to start when the Monitor detects a reached reading limit.
Remote interface — Model 2750 can be controlled using the IEEE-488 interface
(GPIB) or the RS-232 interface.
Section
Model 7701
32 channels
16 channel pairs
N/A
150V Max
No
2/4-wire
No
Latching elec-
tromechanical
1 female DB-50
1 female DB-25
Multiplexer
All DMM
functions except
amps
Model 2750 Multimeter/Switch System User's Manual
7. Connection information for the Model 7700
Appendix B. For all other switching modules, connec-
Model 7702
40 channels 32 channels
20 channel pairs 16 channel pairs
N/A N/A
300V Max 300V Max
Ch 41 and 42, No
3A Max
2/4-wire 2/4-wire
No No
Latching elec- Non-latching
tromechanical reed
Oversized screw 2 female
terminals DB-50s
Multiplexer Multiplexer
All DMM All DMM
functions functions except
amps
Table 1-1.
Section
Model 7703 Model 7705
N/A
N/A
40 channels
300V Max
No
No
No
Latching elec-
tromechanical
2 female
DB-50s
Independent
SPST channels
Multiple chan-
nel operation
only
2,