Model 7700 Multiplexer Module Instructions for use with 2750
2 077182400 July 2023
Switching module capabilities
Channels 1 through 20: The 7700 can multiplex one of 20 2-pole signals, or one of 10 4-pole signals into the
input of the 2750.
Channels 21 and 22: The 7700 can multiplex one of two 2-pole current signals into the input of the 2750.
When you use system channel operation, only one channel or channel pair can be closed at the same
time. When you close a channel or channel pair, all other measurement channels open. The user has
no control of channels 23, 24, and 25. The open and close states of these channels are determined by
the selected function.
The 7700 has six temperature transducers to monitor the cold junction temperature at the screw terminals. For
temperature measurements, this internal reference junction allows thermocouples to be connected directly to the
screw terminals of the module.
When the 2750 is on the DCV, ACV, Ω2, CONT, Ω4, FREQ, PERIOD, or TEMP function, channels 1 through 20
are available. When on a current function (DCI or ACI), channels 21 and 22 are the only available channels.
The 7700 can accommodate 4-wire measurements by using channel pairs. Primary channels 1 through 10
become paired to channels 11 through 20. For example, with the Ω4 function selected, channel 1 becomes paired
to channel 11. For example, when you close channel 1, channel 11 will also close.
The 2-wire functions include DCV, ACV, DCI, ACI, Ω2, CONT, FREQ, PERIOD, and TEMP (thermocouple and
thermistor). The 4-wire functions/operations include Ω4, TEMP (4-wire RTD), RATIO, and CH AVG.
When automatically configured for 4-wire measurements (including 4-wire Ω, RTD temperature, ratio, and
channel average) the channels are paired as follows:
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