Omega Speaker Systems OME-DB-889D - Manual (Page 25)

OME-DB-889D User’s Manual 23
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:
z
One 6 digital voltage meter
z One temperature meter
z 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
1.
Turn off computer power.
2.
Connect OME-A-822PGL (Or any OME-A-82x series multi-function card) to
OME-DB-889D.
3.
Setup OME-DB-889D to default setting
4.
Short CH0HI to CH0LO to A.GND of DB889D.
5.
Connect probe of voltage meter to CN7 (CJC output: + , A.GND : - ).
6.
Turn on computer power
7.
Wait about 5 minute (warn up).
8.
Run Calibration program of OME-DB-889D.
9.
Close the probe of temperature meter to OME-DB-889D them reading
temperature value.
10.
Adjust VR1 until the screen value = 0;
11.
Adjust VR2 until voltage meter reading value = temperature value X 2.44mV