Specifications

A/D Calibration

Regular and accurate calibration procedures ensure the maximum

possible accuracy. The A/D calibration program ADCAL.EXE 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, A I2, AI3, AI4 and AI5 are focused on

7FF (at least 70%).

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

D/A Calibration (for PCI-1711 only)

The D/A calibration program DACAL.EXE leads you through the

whole D/A calibration procedure.

You can select the on-board -5V or -10V internal reference voltage or

an external voltage as your analog output reference voltage. If you

use an external reference, connect a reference voltage within the

range of ±10V to the reference input of the D/A output channel you

want to calibrate. Adjust the full scale of D/A channel 0 and 1, with

VR3 and VR4 respectively.

Note:

Using a precision voltmeter to calibrate the D/A outputs is recommended.