Measurement-computing ADAC/5500 Series Manuel d'utilisateur télécharger pdf (Page 22)

ADAC Series PCI Boards 795 - 17 - ADAC/5500 Series User Manual

Fully-Differential for Grounded Signal Sources

See Figure 4.3 for an example of connecting Grounded Signal Sources in Fully Differential configuration.

Figure 4.3

Fully-Differential Configuration for Grounded Sources

Fully-Differential for Floating Signal Sources

Floating Signal Sources are typically wired to a data acquisition board in Single-Ended configuration,

however, when the Floating Source signal leads pass through an electrically noisy environment, Fully-

Differential configuration will give the best performance. When wiring Floating Signal sources in Fully-

Differential configuration, a resistor must be connected from the low side of the sources to analog ground

(AGND). These resistors create a return path to AGND for the bias currents of the instrumentation amplifier.

If a return path is not provided, the bias current will build up on stray capacitance, resulting in drift and

possible saturation of the amplifier.

If the input signal is DC coupled a 10 K ohm to 100 K ohm resistor must be connected from the input signal's

return to the data acquisition board's AGND.

For AC coupled input signals a 10 K ohm to 100 K ohm resistor must be connected from both input signal

high and input signal low to AGND.

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Measurement-computing ADAC/5500 Series Manuel d'utilisateur Page 22