General Tools and Instruments IRT730K - Manual (Page 6)

OPERATING INSTRUCTIONS
USING THE IRT TO MEASURE TEMPERATURE
This section describes how to operate the IRT730K in its “normal” mode, with and without use
of the backlight and/or laser pointer. In this mode (called REC mode), each measurement made
by squeezing the measurement trigger is automatically stored (recorded) in a numerically
tagged location in the instrument’s nonvolatile memory. After 100 measurements are stored,
the 101st measurement made overwrites (erases) the first one. The section also explains how
to change the factory default temperature unit from °F to °C.
1. Carefully remove the protective plastic film covering the LCD.
2. Power on the IRT730K by squeezing and holding the yellow measurement trigger
(Fig. 1, Callout 3) while pointing the unit anywhere. The LCD and its gray backlight will
illuminate and the laser pointer will activate. (If none of these three things happen, the
IRT’s battery is dead and must be replaced; see p. 5 for instructions.) Note that squeezing
the trigger causes the word SCAN (Fig. 2, Callout 1) to appear, flashing, in the upper left
corner of the LCD.
3. Release the trigger. The following events will occur in a rapid-fire sequence:
I. The unit will “chirp.”
II. The word SCAN will disappear and be replaced by the word HOLD just below it.
III. The measured temperature will appear on the primary (large) readout in °F, with the
text REC at its lower left. REC indicates that the measurement is about to be
automatically stored (recorded) in the IRT730K’s nonvolatile memory.
IV. The measured temperature will also appear on the secondary (smaller) readout,
following the brief appearance of a two-digit number. If this is the IRT’s first
measurement, that number will be 01. The number represents the measurement’s
memory storage location.
4. Squeeze and hold the trigger again while pointing the IRT at a different target. Then
release the trigger. As before, the unit will chirp and SCAN will be replaced by HOLD. The
temperature of the second target will again appear on both the primary and secondary
readouts. This time, however, note that the second reading will be accompanied by the
brief appearance of the memory tag 02 on the secondary readout.
5. Squeeze and hold the trigger again and then release it. The same sequence of events
will occur, with the new reading tagged 03 in memory. Allow 30 seconds to pass. After
30 seconds, the IRT’s Auto Power Off (APO) function will activate and cause the unit to
shut down silently.
To change the measurement unit from the factory default °F to °C, press the MODE button
(Fig. 1, Callout 6) once briefly while operating in REC mode. REC will be replaced by MAX in the
middle of the LCD. Then press the °C/°F button (Fig. 1, Callout 8). This will convert the
Fahrenheit readings on both readouts to the corresponding Celsius values.
To return to operation in REC mode, press the MODE button seven times with MAX on-screen.
REC will replace MAX. The next section of the manual explains how to switch to operation in
the IRT730K’s six display modes other than REC and MAX.
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