Chapter 9 Calibration; Vr Assignment - Advantech PCM-3718 Series User Manual

Chapter 9 Calibration

Regular calibration checks are key factors for accuracy maintenance. We
provide a calibration program for DOS, CALB.EXE, in the CD-ROM
shipped with your PCM-3718 card to assist you in this task.
Path: DOS\PCM\PCM3718.100
CALB.EXE makes calibration easy. It leads you through the calibration
and setup procedures with a variety of prompts and graphic displays,
showing you all of the correct settings and adjustments. The explanatory
material in this section is brief, intended for use in conjunction with the
calibration program.
To perform a satisfactory calibration, you need a 4½-digit digital multim-
eter and a voltage calibrator or a stable, noise-free D. C. voltage source.

9.1 VR Assignment

The five variable resistors (VRs) on the PCM-3718 board help you make
accurate adjustments on all A/D. See the figure on page 5 for the VR
locations on the board. The following list shows the function of each VR:
VR
VR1
VR2
VR3
VR4
VR5
VR6
PCM-3718 Series User Manual
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Function
A/D full scale adjustment
A/D bipolar offset
A/D unipolar offset
High Gain Calibration offset (only for PCM-3718HG)
D/A full scale adjustment (only for PCM-3718HO)
D/A offset (only for PCM-3718HO)
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