Figure 75: Two-wire function
The following figure shows an example of how the channel and its paired channel are connected to
the DMM Input and Sense terminals of the Series 3700A for a 4-wire DMM operation. Assume a
switching module with 20 channels is installed in Slot 1 of the mainframe, and a 4-wire function, such
as 4Ω, is selected. When you perform a DMM close operation on Channel 1001, the Series 3700A
closes Channel 1001 and Channel 1911 (backplane isolation relay) to connect the channel to DMM
Input. The Series 3700A also closes Channel 1011 (the paired channel) and Channel 1922 (the
sense backplane isolation relay) to connect the paired channel to DMM Sense.
Figure 76: Four-wire function
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