Measurement-computing CIO-DAS08-PGH User Manual download pdf (Page 10)

3.1.2 Differential Inputs

Differential inputs measure the voltage between two distinct input signals. Within a certain range (referred to as the common mode

range), the measurement is almost independent of signal source to CIO-DAS08-PGA ground variations. A differential input is also

much more immune to EMI than a single-ended one. Most EMI noise induced in one lead is also induced in the other, the input

only measures the difference between the two leads, and the EMI common to both is ignored. This effect is a major reason there is

twisted pair wire as the twisting assures that both wires are subject to virtually identical external influence. Figure 3-2 below

shows a typical differential input configuration.

Figure 3-2. Differential Input Configuration

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Measurement-computing CIO-DAS08-PGH User Manual Page 10