Omega Speaker Systems PCI-DAS1001 User Manual download pdf (Page 14)

4.2.4 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 PCI-DAS1000). The diagram below show recommended connections

in this configuration.

4.2.5 Common Mode Voltage > +/-10V

The PCI-DAS1000 will not directly monitor signals with common mode voltages greater than +/-10V. You will either need

to alter the system ground configuration to reduce the overall common mode voltage, or add isolated signal conditioning

between the source and your board.

Input

Amp

To A /D

A/D Board

I/O

Connector

LL GND

CH High

CH Low





Signal Source

with Common

Mode 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 volta

e difference

between si

nal source and

A/D board

round is lar

enou

h so the A/D board’s

common mode ran

e is

exceeded, isolated si

nal

conditionin

must be added.

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Omega Speaker Systems PCI-DAS1001 User Manual Page 14

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