Zapco DC Intro - Manual (Page 14)

Getting Started
1) In the top left corner we choose the channel
(or channel pair) we will adjust. In this case we
have chosen to adjust Ch3/4 (highlighted in
Green)
2) In the lower left corner we choose
which channel (or channel pair) we will
use as the input for our adjustment
Channel. We also set the input sensitivity voltage for our
input channel. In this case we will use Ch1/2 as input at 1.91
volts sensitivity.
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Note that for Ch 3/4 input we can use any combination of channels 1, 2, 3, and 4.