Omega Vehicle Security freedom OM-550 - Manual (Page 52)

OM-550 u 47 u
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VOLTAGE ADJUSTMENT PROCEDURE:
It is recommended that the OM-550 is operated with the batteries while this
procedure is preformed to reducing noise in measured voltages.
1. Use a white (copper) voltage connector and copper wire for all voltage and
thermocouple inputs during calibration.
2. Locate the access hole for the Volt Gain adjustment on the bottom of the OM-
550.
Figure A-4
3. Apply a 2.00000 VDC standard voltage to channel #1.
4. Start logging and produce a printout, press RUN, YES on the keypad.
5. Adjust the Volt Gain pot for a CH #1 reading of 2.0000 V (±0.0001V).
6. Press the STOP key.
7. Proceed with the thermocouple adjustment.
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THERMOCOUPLE ADJUSTMENT PROCEDURE:
1. Apply a 49.996mV (type K @ 2250 °F) standard voltage to channel #2.
2. Locate the access hole for the Temp Gain adjustment in the back cover.
3. Start logging and produce a printout, press RUN, YES on the keypad.
4. Adjust the Temp Gain pot for a channel #2 reading of +2250.0°F(±1°F).
5. Press the STOP key.
GAIN ADJUST