Measurement-computing PCM-DAS16x/16 Manual de usuario descargar pdf (Pagina 29)

6.2.5 Common Mode Voltage > +/-10V

The PCM-DAS16x/16 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.

6.2.6 Isolated Grounds / Single-Ended Inputs

Single-ended inputs can be used to monitor isolated inputs, though the use of the dif-

ferential mode will increase you system’s noise immunity. The diagram below shows

the recommended connections is this configuration.

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 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.

Input

Amp

To A/D

A/D Board

I/O

Connector

LL GND

CH High

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 Signal Source

Connected to a Single-Ended Input

I/O

Connector

Input

Amp

To A/D

LL GND

CH IN

A/D Board





Isolated

signal

source

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