5
25@100
50@200
75@300
1@4
2@8
3@12
D:S=4:1
turn the laser off, press the
MODE
button twice. When the
Laser Enabled icon begins to flash, press the
Meas
. button to
turn off the laser. The laser will remain disabled until the IRT3
powers off. When the IRT is powered on again, the laser will
be re-enabled automatically.
To power off the IRT3
, either press and hold the
MODE
button for at least 3 seconds or let the Auto Power Off (APO)
function turn the IRT off after 15 seconds of front-panel
inactivity.
To change the temperature unit
, press the
MODE
button
once. When the currently selected temperature unit begins
to flash, press the
Meas
. button to switch to or from °F
(the default unit) and °C.
MAKING ACCURATE MEASUREMENTS
The IRT3 has a distance-to-spot (D:S) ratio of 4:1. This means
that the target area (spot) whose infrared radiation
(temperature) is being measured increases in diameter by
1 inch for every 4 inches you move away from the target.
Conversely, the diameter of the target area measured
decreases by 1 inch for every 4 inches you move closer to
the target.
Fig. 3. The IRT3’s field of view
