Measurement-computing PCM-DAS16D/12 Manuel d'utilisateur télécharger pdf (Page 13)

4.1.2 Differential Inputs

Differential inputs measure the voltage between two distinct input signals.

Within a certain range (referred to as the common mode range), the measure-

ment is almost independent of signal source to PCM-DAS16x/12 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 identi-

cal external influence. The diagram below shows a typical differential input

configuration.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 35 36

Pas de commentaire

Measurement-computing PCM-DAS16D/12 Manuel d'utilisateur Page 13