Measurement-computing CIO-DAS08-PGH User Manual download pdf (Page 15)

3.2.5 Common Mode Voltage > +/-10V

The CIO-DAS08-PGx 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. See Figures 3-7 and 3-8.

Figure 3-7. Common Mode Voltage - >+/- 10V Single-Ended Input

Figure 3-8. Common Mode Voltage - >+/- 10V Differential Input

System with a Lar

e Common Mode Volta

Connected to a Sin

le-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.

stem with a Lar