Measurement-computing CIO-DAS6402/12 Instrukcja Użytkownika Pobierz pdf (Strona 15)

4.2.1 COMMON GROUND / SINGLE-ENDED INPUTS

Single-ended is the recommended configuration for common ground connections. However, if some of your inputs are common

ground and some are not, we recommend you use the differential mode. There is no performance penalty (other than loss of

channels) for using a differential input to measure a common ground signal source. However the reverse is not true. Figure 4-4

below shows a recommended connection diagram for a common ground / single-ended input system

Figure 4-4. Common Ground / Single-Ended Inputs

4.2.2 COMMON GROUND / DIFFERENTIAL INPUTS

The use of differential inputs to monitor a signal source with a common ground is a acceptable configuration though it requires

more wiring and offers fewer channels than selecting a single-ended configuration. Figure 4-5 below shows the recommended

connections in this configuration.

Figure 4-5. Common Ground / Differential Inputs

4.2.3 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.

4.2.4 COMMON MODE VOLTAGE < +/-10V / DIFFERENTIAL INPUTS

Input

Amp

To A/D

A/D Board

I/O

Connector

LL GND

CH IN





Signal

Source with

Common Gnd

Optional wire

since signal source

and A/D board share

common ground

Signal source and A/D board

sharing common ground connected

to single-ended input.

Input

Amp

To A/D

A/D Board

I/O

Connector

LL GND

CH High

CH Low





Signal

Source with

Comm on Gnd

Optional wire

since signal source

and A/D board share

common ground

Required connection

of LL GND to CH Low

Signal source and A/D board

sharing common ground connected

to differential input.

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