Omega Speaker Systems OME-DB-889D manual Calibration VR Description, Calibration Steps

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:

zOne 6 digital voltage meter

zOne temperature meter

zOne 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

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2.

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11.

Turn off computer power.

Connect OME-A-822PGL (Or any OME-A-82x series multi-function card) to OME-DB-889D.

Setup OME-DB-889D to default setting

Short CH0HI to CH0LO to A.GND of DB889D.

Connect probe of voltage meter to CN7 (CJC output: + , A.GND : - ). Turn on computer power

Wait about 5 minute (warn up).

Run Calibration program of OME-DB-889D.

Close the probe of temperature meter to OME-DB-889D them reading temperature value.

Adjust VR1 until the screen value = 0;

Adjust VR2 until voltage meter reading value = temperature value X 2.44mV

OME-DB-889D User’s Manual 23