When all locations are occupied, the memory location counter will read 99 and pressing the
MEM
button will not store on-screen data. It is then time to clear the memory. Although
individual memory locations cannot be cleared, the entire memory can be cleared by pressing
and holding the
SEL
button with the unit operating in Recall mode.
To operate in Recall mode (for the purpose of recalling stored records), squeeze the trigger to
power on the instrument and press the
RCL
button (Fig. 1, Callout H). The record that was
most recently accessed will appear on-screen, along with its memory location number. To view
the contents of other locations, navigate to them by pressing the
▼
and
▲
buttons.
MEASUREMENT LOCK MODE
Operating in this mode makes it unnecessary to keep squeezing the trigger to make
measurements.
To enter Measurement Lock mod
e, squeeze the trigger to power on the instrument and press
the
USB
button (Fig. 1, Callout I).
USB
will appear in the bottom left corner of the LCD. Within
10 seconds, press and hold the
SEL
button for at least three seconds. Doing so will cause
SCAN
to appear on the top line of the LCD, just as it does when making normal
measurements. However, note that releasing the trigger does not cause
SCAN
to be replaced
by HOLD, as in normal operation.
In Measurement Lock mode, you can make multiple measurements without squeezing the
trigger simply by pointing the IRT at different targets over time. The 10-second Auto Power Off
function is disabled in Measurement Lock mode, as is your ability to store and recall readings.
But you can still use the
MODE
button to view Min/Max/Avg and Dif values since the beginning
of the measurement session.
Although Measurement Lock mode extends the length of measurement sessions beyond the
10-second APO interval, this convenience comes with a downside. If you forget to exit
Measurement Lock mode and leave the IRT unattended, continuous operation will quickly
discharge the battery—especially if the laser pointer is left on. For this reason, it is important
that you remember to exit Measurement Lock mode before leaving the IRT unattended. To do
so, press the
USB
button. Note that doing so causes
SCAN
to be replaced by
HOLD
with the
trigger released—just as in normal operation.
DATA LOGGING
To configure the IRT855DL for data logging:
1) Begin powering the IRT through the included 9V AC adaptor. To connect the adaptor, insert
its round plug into the DC9V jack on the bottom of the unit (Fig. 1, Callout N) and its twin AC
plugs into a 110/220V receptacle.
2) Attach the IRT to a tripod via the threaded tripod mount (Fig. 1, Callout O) on the gun in front
of the measurement trigger.
3) Connect the IRT to your PC by inserting the micro-USB plug end of the included USB cable
into the USB jack (Fig. 1, Callout M) on the bottom of the IRT, and the full-size USB plug at
the other end into a USB port of the PC.
9
