Measurement-computing CIO-DAS08-PGH User Manual download pdf (Page 14)

3.2.2 Common Ground / Differential Inputs

The use of differential inputs to monitor a signal source with a common ground is a acceptable configuration though it requires

more wiring and offers fewer channels than selecting a single-ended configuration. Figure 3-5 below shows the recommended

connections in this configuration.

Figure 3-5. Common Ground / Differential Inputs

3.2.3 Common Mode Voltage < +/-10V/Single-Ended Inputs

This is not a recommended configuration. In fact, the phrase common mode has no meaning in a single-ended system and this case

would be better described as a system with offset grounds. However, you can try this configuration. No system damage should

occur and depending on the overall accuracy you require, you may receive acceptable results.

3.2.4 Common Mode Voltage < +/-10V/Differential Inputs

Systems with varying ground potentials should always be monitored in the differential mode. Care is required to assure that the

sum of the input signal and the ground differential (referred to as the common mode voltage) does not exceed the common mode

range of the A/D board (+/-10V on the CIO-DAS08-PGx). The diagram below show recommended connections in this

configuration.

Figure 3-6. Common Mode Voltage < +/-10V/Differential Inputs

Input

Amp

To A /D

A/D Board

I/O

Connector

LL GND

CH High

CH Low

Signal

Source with

Common Gnd

Optional wire

since signal source

and A/D board share

common ground

Required connection

of LL GND to CH Low

nal source and A/D board

sharin

common

round connected

to differential input.

Input

Amp

To A/D

A/D Board

I/O

Connector

LL GND

CH Hi

CH Low

Signal Source

with Common

M ode Voltage

nal source and A/D board

with common mode volta

connected to a differential input.

GND

The voltage differential

between these grounds,

added to the maximum

input signal must stay

within +/-10V

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Measurement-computing CIO-DAS08-PGH User Manual Page 14

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