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2.3.6 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 2-9 below shows the recommended connections is this configuration

Figure 2-9

Isolated Grounds / Single-Ended Inputs

2.3.7 Isolated Grounds / Differential Inputs

Optimum performance with isolated signal sources is assured with the use of the differential input setting. Figure 2-10

below shows the recommend connections is this configuration..

Figure 2-10. Isolated Grounds / Differential Inputs

Isolated Signal Source

Connected to a Single-Ended Input

I/O

Connector

Input

Amp

To A/D

LL GND

CH IN

A/D Board





Isolated

signal

source

Input

Amp

To A /D

A/D Board

I/O

Connector

LL GND

CH High

CH Low

Signal Source

and A/D Board

Already Isolated.

Already isolated si

nal source

and A/D board connected to

a differential input.

GND

These

rounds are

electrically isolated.

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.

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