Quote:
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Originally Posted by jerry w
... the data sheet on this device lists the max voltage at +- 20 volts ... it would be good practice to avoid hooking this DAQ to anything on the 12 volt side of a controller.
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Remember that the +/- 20V is only for
differential mode measurements (using 2 wires with the measured voltage being the difference between the voltages on the wires) - a
single-ended mode measurement (one voltage with the reference voltage being ground) can only handle up to +/- 10V. Most measurements should be made in
differential mode as this mode is less prone to problems with differing ground references, with
single-ended measurements only made when you're measuring a
floating source, or a source with no connection to ground at the signal source.
-Danny