Fluke 566 - Manual (Page 19)

Infrared Thermometers
How the Thermometers Work
11
How the Thermometers Work
Infrared thermometers measure the surface temperature of an object. The thermometer’s
optics sense emitted, reflected, and transmitted energy, which is collected and focused
onto a detector. The unit’s electronics translate the signal into a temperature reading
which the unit displays (see Figure 3).
Reflected energy
Emitted
Energy
Transmitted
energy
Target
eyl002f.eps
Figure 3. How the Thermometer Works
Operating the Thermometer
Temperature Measurement
To measure temperature, point the thermometer at an object and pull the trigger. You can
use the laser pointer to help aim the thermometer. You may also insert the K-type
thermocouple probe for contact measurement. Be sure to consider distance-to-spot size
ratio and field of view (see “Distance and Spot Size” and “Field of View”). The
temperature appears on the display.
Note
The laser is used for aiming purposes only and is not related to temperature
measurement.
The thermometer features an auto off function that automatically powers down the
thermometer after 20 seconds of inactivity. To turn the thermometer on, pull the trigger.