Advantech PCI-1720U Manual de usuario descargar pdf (Pagina 36)

PCI-1720U User Manual 30

Appendix A Calibration

A.1 Overview

The PCI-1720U card uses eight variable resistors (VRs), two for each

channel, which allow you to calibrate each of the card’s four output chan-

nels. The following information outlines the function of each VR. Refer

to the illustration shown below for the locations of the PCI-1720U’s VRs.

Figure A.1: PCI-1720U VR assignment

VR1 Channel 0’s full scale (gain) adjustment.

VR2 Channel 1’s full scale (gain) adjustment.

VR3 Channel 2’s full scale (gain) adjustment.

VR4 Channel 3’s full scale (gain) adjustment.

VR5 Channel 0’s offset adjustment.

VR6 Channel 1’s offset adjustment.

VR7 Channel 2’s offset adjustment.

VR8 Channel 3’s offset adjustment.

You should use a precision voltmeter/ammeter to obtain accurate read-

ings when calibrating the PCI-1720U. Standard procedures for perform-

ing a calibration are given below.

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Advantech PCI-1720U Manual de usuario Pagina 36