Measurement-computing CIO-DAS16 Uživatelský manuál stáhnout pdf (Strana 20)

3.3.5 Common Mode Voltage > +/-10V

The CIO-DAS16/F 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 (Figure 3-8).

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

3.3.6 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 3-9 shows the recommended connections is this configuration.

Figure 3-9. Isolated Grounds / Single-Ended Inputs

System with a Large Common Mode Voltage,

Connected to a Differential Input

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.

Input

Amp

To A/D

A/D Board

I/O

Connector

LL GND

CH Hi

CH Low

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.

Isolated Si

nal Source

Connected to a Sin

le-Ended Input

I/O

Connector

Input

Amp

To A/D

LL GND

CH IN

A/D Board





Isolated

signal

source

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