Omega Vehicle Security HH-21 User Manual

Page 17

NOTE: The thermometer will display “OPEN” on

any selected channel that does not have a
thermocouple plugged in or if the thermo-
couple is open-circuited.

CAUTION

When using both thermocouple inputs, and a
voltage differential exists between the two mea-
surement points, at least one probe should be
electrically insulated.

NOTES:
• T1 and T2 are not measured simultaneously.

Therefore T1 and T2 readings can differ even
when the temperatures are equal, if T1 and T2
are changing rapidly.

• Key selection is retained during power off.

With the REC key, the recording of MIN/MAX temperatures is
enabled. This function can be activated in one or more of the 3
measurement modes, T1, T2, and T1-T2. To start recording,
select a desired measurement mode (T1, T2, or T1-T2), then
press REC.

When more than one measurement mode is to be recorded,
select the desired mode and then activate the record function.
When REC is activated, a corresponding annunciator(s) will turn
on and start flashing adjacent to the mode annunciator(s) (T1, T2,
T1-T2). The flashing REC annunciator means that minimum and
maximum data is being recorded. The instrument has 3 separate
acquisition files which allow simultaneous recording of all three
modes.

NOTE: REC cannot be started while the readout is

in the SCAN mode. However, after record-
ing is initiated, the readout can be set to the
SCAN mode.

REC