User`s manual

CAUTION

Is that signal source really floating? Check it with a voltmeter before risking the

PCI-DAS1602/16 and PC! If you can measure a constant voltage between the grounds of

the PC and your signal source, it’s probably not floating.

2.4.3 Differential

Proper measurement of a differential signal requires three wires from the signal source. The signals are

Signal High (CH# High), Signal Low (CH# Low) and Signal Ground (Analog Ground).

A differential connection allows you to connect the PCI-DAS1602/16 to a signal source with a ground

that is different, but not isolated from the PC ground, but less than 10V difference, and still make a true

measurement of the signal between CH# High and CH# Low.

EXAMPLE:

Non-Isolated laboratory instruments with three prong wall plug. There are usually differences in wall

GND potentials between outlets.