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A floating differential hookup is handy when the signal source is floating with respect
to ground, such as a battery, 4-20 mA transmitter or thermocouple and the lead lengths
are long or subject to EMI interference.
The floating differential input will reject up to 10V of EMI energy on the signal wires.
WARNING!
Verify that the signal source is really floating. Check it with a
voltmeter before risking the CIO-SSH16 and PC!
3.4 DIFFERENTIAL
A differential signal is three wires from the signal source. The signals are Signal High
(CH# HI), Signal Low (CH# LO) and Signal Ground (LLGND).
A differential connection allows you to connect the CIO-SSH16 to a signal source
with a ground that different than the PC ground, but less than 10V difference, and still
make a true measurement of the signal between CH# HI and CH# LO.
EXAMPLE:
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