Model 7700 Multiplexer Module Instructions for use with 2750
077182400 July 2023 5
To prevent electric shock that could result in serious injury or death, comply with these safety
precautions:
Before making or breaking any connections to the switching card, make sure the
instrument is turned off and power is removed from all external circuitry.
Do not connect signals that will exceed the maximum specifications of any installed
switching card.
Dangerous arcs of an explosive nature in a high-energy circuit can cause severe personal
injury or death if contacted. If the instrument is connected to a high-energy circuit when set to
a current range, low-resistance range, or any other low-impedance range, the circuit is
virtually shorted. Dangerous arcing can result even when the multimeter is set to a voltage
range if the minimum voltage spacing is reduced in the external connections. For details about
how to safely make high-energy measurements, see “High-energy circuit safety precautions”
in the Reference Manual for the instrument.
Do not exceed the maximum specifications for the 7700. Refer to the specifications provided in
the datasheet. Failure to recognize and observe normal safety precautions could result in
personal injury or death.
The following information describes how to make connections to the switching module and define the channel
designations. A connection log is provided that you can use to record your connections. See Connection log
(on page 10).
This section describes how to make connections to the terminal screws in the module. You can make:
Current connections, provided through two protected channels (channels 21 and 22)
INPUT connections
SENSE (4-wire resistance) connections
AMP and LO common connections to the instrument
Channel 23 (2W/4W Configuration), Channel 24 (Sense Isolation), and Channel 25 (Input Isolation) are normally
automatically configured by the 2750 for system channel operation. However, by using multiple channel
operation, channels can be individually controlled.
Connect 4-wire sense leads using channels 11 to 20. To disconnect channels 11 to 20 from channels
1 to 10, send:
ROUT:MULT:CLOS (@123)
Note opposite logic.
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