Calibration; Calibration Vr Description; Calibration Steps - Omega Engineering OME-DB-889D User Manual

6. Calibration

The OME-DB-889D is calibrated to its best of operation. For environment subjected
to large vibrations, recalibration is recommended. Before calibrating the
OME-DB-889D, user should consider having the following available:
One 6 digital voltage meter
One temperature meter
One OME-A-82x series multifunction card

6.1 Calibration VR Description

There are two VRs on the OME-DB-889D.
VR Num. Description
VR1 Amplifier Offset adjustment
VR2 CJC Gain adjustment

6.2 Calibration Steps

Turn off computer power.
1.
Connect OME-A-822PGL (Or any OME-A-82x series multi-function card) to
2.
OME-DB-889D.
Setup OME-DB-889D to default setting
3.
Short CH0HI to CH0LO to A.GND of DB889D.
4.
Connect probe of voltage meter to CN7 (CJC output: + , A.GND : - ).
5.
Turn on computer power
6.
Wait about 5 minute (warn up).
7.
Run Calibration program of OME-DB-889D.
8.
Close the probe of temperature meter to OME-DB-889D them reading
9.
temperature value.
Adjust VR1 until the screen value = 0;
10.
Adjust VR2 until voltage meter reading value = temperature value X 2.44mV
11.
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