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Figure 5-8. Common Mode Voltage > +/-10V. Differential Input

5.2.6 Isolated Grounds / Single-Ended Inputs

Single-ended inputs can be used to monitor isolated inputs, though the use of the differential mode will

increase you system’s noise immunity. Figure 5-9 below shows the recommended connections is this

configuration.

Figure 5-9. Isolated Grounds / Single-Ended Input

System with a Lar

e Common Mode Volta

Connected to a Differential Input

arge common

mode voltage

between signal

source & A/D board

GND

Isolation

Barrier

When the voltage difference

between signal source and

A/D board ground is large

enough so the A/D board’s

common mode range is

exceeded, isolated signal

conditioning must be added.

Input

Amp

To A /D

A/D Board

I/O

Connector

LL GND

CH High

CH Low

10 K

10K is a recommended value. You may short LL GND to CH Low

instead, but this will reduce your system’s noise immunity.

Isolated Si

nal Source

Connected to a Sin

le-Ended Input

I/O

Connector

Input

Amp

To A /D

LL GND

CH IN

A/D Board





Isolated

signal

source

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