1-6 Getting Started Model 2750 Multimeter/Switch System User’s Manual
• 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.
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 Table 1-1.
Basic close/open operation for switching module channels is provided in Section 2,
while scanning is covered in Section 7. Connection information for the Model 7700
switching module is provided in Appendix B. For all other switching modules, connec-
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 Model 7701 Model 7702 Model 7703 Model 7705
2-pole operation
4-pole operation
1-pole operation
Measure volts
Measure amps
Measure ohms
Cold junction
for thermo-
couples
Relay type
1
Connector type
Configuration
2
Unique features
20 channels
10 channel pairs
N/A
300V Max
Ch 21 and 22,
3A Max
2/4-wire
Yes
Latching elec-
tromechanical
Oversized screw
terminals
Multiplexer
All DMM
functions
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
40 channels
20 channel pairs
N/A
300V Max
Ch 41 and 42,
3A Max
2/4-wire
No
Latching elec-
tromechanical
Oversized screw
terminals
Multiplexer
All DMM
functions
32 channels
16 channel pairs
N/A
300V Max
No
2/4-wire
No
Non-latching
reed
2 female
DB-50s
Multiplexer
All DMM
functions except
amps
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
2750-900-01.book Page 6 Wednesday, August 3, 2011 7:56 AM
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