Measurement-computing PCM-DAS16x/16 Manual de usuario descargar pdf (Pagina 28)

6.2.3 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. Anyway, you are welcome to try this configuration, no system

damage should occur and depending on the overall accuracy you require, you may

receive acceptable results.

6.2.4 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 differ-

ential (referred to as the common mode voltage) does not exceed the common mode

range of the A/D board (+/-10V on the PCM-DAS16x/16). The diagram below show

recommended connections in this configuration.

Input

Amp

To A/D

A/D Board

I/O

Connector

LL GND

CH High

CH Low

Signal Source

with Common

M ode Voltage

Signal source and A/D board

with common mode voltage

connected to a differential input.

GND

The voltage differential

between these grounds,

added to the maximum

input signal must stay

within +/-10V

System with a Large Common Mode Voltage,

Connected to a Single-Ended Input

I/O

Connector

Input

Amp

To A /D

LL GND

CH IN

A/D Board

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.

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