Advantech PCI-1711 Bedienungsanleitung PDF herunterladen (Seite 46)

PCI-1711U Series User Manual 40

C.2 A/D Calibration

Regular and accurate calibration ensures maximum possible accuracy.

The A/D calibration tool in the Advantech Device Manager leads you

through the whole A/D offset and gain adjustment procedure. The basic

steps are outlined below:

1. Connect a DC voltage source of +9.995 V to AI0.

2. Connect AGND to AI1, AI2, AI3, AI4 and AI5.

3. Run the ADCAL.EXE program.

4. Adjust VR2 until the output codes from the card’s AI0 are focused

on FFE (at least 70%), and adjust VR1 until the output codes from

the card’s AI1, AI2, AI3, AI4 and AI5 are focused on 7FF (at least

70%).

5. Press the SPACE key to finish A/D calibration.

C.3 D/A Calibration (PCI-1711U)

In a way similar to the A/D Calibration, the D/A calibration tool in the

Advantech Device Manager leads you through the whole D/A calibration

procedure.

1. Measure the DA0 output with a 4 1/2-digit digital meter. Adjust the

VR3 until the output value equals 4.9988V.

2. Measure the DA1 output with a 4 1/2-digit digital meter. Adjust the

VR4 until the output value equals 4.9988V.

3. The D/A calibration is finished.

Note: Using a precision voltmeter to calibrate the

A/D outputs is recommended.

Note: Using a precision voltmeter to calibrate the D/A

outputs is recommended.

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Advantech PCI-1711 Bedienungsanleitung Seite 46