Advantech PCI-1710 - Manual (Page 50)

46 PCI-1710/1710HG User's Manual
5.1 Introduction
Regular calibration checks are important to maintain accuracy in data
acquisition and control applications. We provide two calibration
programs, ADCAL.EXE and DACAL.EXE, on the PCI-1710/1710HG
software CD-ROM. ADCAL.EXE assists you in A/D calibration, and
DACAL.EXE in D/A calibration.
The ADCAL.EXE and DACAL.EXE make calibrations easy. It leads
you through the calibration and setup procedure with a variety of
prompts and graphic displays, showing you all of the correct settings
and adjustments. This appendix offers a brief guide to these
calibration programs.
To perform a satisfactory calibration, you need a 4 1 /
2
-digit digital
multimeter and a voltage calibrator or a stable, noise free D. C. voltage
source.
5.2 VR Assignment
There are five variable resistors (VRs) on the PCL-1710/1710HG
card. They help you to make accurate adjustments on all A/D and D/A
channels. Please refer to the following figure for VR position.
Figure 5-1: PCL-1710/1710HG VR assignment
P1
V R 4 V R 3 V R 2 V R 1 V R 5