Omega Vehicle Security OMP-MODL - Manual (Page 259)

11.. . A PPENDIX A: M ASTER I CON R EFERENCE
U SING THE OMP-MODL 11-97
CJC - a Cold Junction Compensation sensor is mounted near the terminal
strip header on the inside of the MLAD-1.. The temperature it measures at
the terminal strip is used during thermocouple millivolt to temperature
conversions (MLIM-1). This CJC Recalibration Period specifies how
frequently the CJC temperature is checked and updated in the
thermocouple calculation equation. Any temperature error in the
measurement at the terminal strip will result in a nearly equal error in the
thermocouple reading.
TIP: If a short duration test is being performed where
maximum speed of thermocouple readings is required,
sufficient accuracy may be achieved by setting the
Recalibration Period fairly long. In this way, a CJC
recalibration will be done before the first pass through the
Program Net, then the high speed readings will be taken,
then another CJC recalbration. During the test, the
terminal strip thermal mass will keep the CJC temperature
fairly constant.
Battery - the internal power supply voltage is checked periodically based
on the User specified Recalibration Period. This Battery voltage is used by
the Warning icon for detection of a Power Low condition and for update of
the OMP-MODL front panel LCD System Supply Voltage display. For most
applications of OMP-MODLs this period can be set fairly long (eg 3600
seconds) as battery voltage droops slowly. If additional loads are being
powered such as modems, outputs, etc shorten this value accordingly.
If the Warning icon is not being used and battery voltage will not be
checked via the LCD or through a serial communication Status Query, this
Recalibration Period can be set very long.
Auto-answer after __ ring: If a OMP-MODL is equipped with a modem, the number
of rings to wait before answering the call can be User defined. Enter the
number in the provided text box.