Measurement-computing CIO-DAS16Jr/16 Instrukcja Użytkownika Pobierz pdf (Strona 13)

2.3.3 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.

2.3.4 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 CIO-DAS16JR/16). Figure 2-7 below show recommended

connections in this configuration.

Figure 2-7

Common Mode Voltage < +/-10V/Single-Ended Inputs

2.3.5 Common Mode Voltage > +/-10V

The CIO-DAS16JR/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 (Figure 2-8).

Figure 2-8. Common Mode Voltage > +/-10V - Serial/Differential Inputs

Input

Amp

To A/D

A/D Board

I/O

Connector

LL GND

CH Hi

CH Low

Signal Source

with Common

M ode Voltage

nal source and A/D board

with common mode volta

connected to a differential input.

GND

The voltage differential

between these grounds,

added to the maximum

input signal must stay

within +/-10V

stem with a Lar

e Common Mode Volta

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.

stem 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.

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