National Instruments Module SCXI-1125 Manual do Utilizador descarregar pdf (Página 19)

Chapter 2 Connecting Signals

SCXI-1125 User Manual 2-2 ni.com

completely isolated from other channels. You can operate with

common-mode voltage levels up to 300 V

rms

Figures 2-1 through 2-4 show signal connection methods that give the

highest noise immunity.

Ground-Referenced Signal

When the negative input signal line is connected either directly or

indirectly to earth ground (usually at the transducer end), connect this line

to the negative input terminal, as shown in Figure 2-1. No ground

connection is made at the SCXI-1125. This situation includes cases where

a floating source can be riding on a high common-mode voltage that is

ground referenced.

Figure 2-1. Connecting a Ground-Referenced Signal

Module

–

High

CMV

out

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National Instruments Module SCXI-1125 Manual do Utilizador Página 19