National Instruments Module SCXI-1125 Manual de usuario descargar pdf (Pagina 20)

Chapter 2 Connecting Signals

Floating Signal

In cases where both signal lines at the transducer end are floating and no

common-mode voltage exists, establish an earth connection at the

SCXI-1125 by connecting the negative input line to chassis ground in the

terminal block, as shown in Figure 2-2. This eliminates noise that can ride

on the floating signal. If the floating signal is not configured like

Figure 2-2, the noise can couple to the chassis ground through the amplifier

and exhibit a differential mode signal that can be amplified by the

amplifier. Connecting the signal to chassis ground breaks the isolation

barrier.

Figure 2-2. Connecting a Floating Signal

Module

–

out

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 100 101

Sin comentarios

National Instruments Module SCXI-1125 Manual de usuario Pagina 20