For this reason, measurement of these objects is
effected by powerful infrared energy radiated from nearby
objects with high emissivity or high temperature.
For example, when such objects are measured in sunlight,
erratic measurement happened because of powerful
radiated energy from the sun and reflected by the surface of
the object and received by the sensor.
4-5 Emissivity Adjustment
A factory set emissivity value is 0.95, which will cover
90% of the typical applications. However to match the
correct emissivity with the specific value of the object is
important in order to obtain the true temperature. When
the emissivity of the object is known & its value is not 0.95.
It is necessary to adjust the emissivity value again. The
adjustment procedures are listed as following :
a) Press the " Emissivity Button " ( 3-8, Fig. 1 )
continuously for at least 2 seconds. The emissivity value
will flash, then release the button.
b) Use the " Down Button " ( 3-4, Fig. 1 ), " Up Button "
( 3-7, Fig. 1 ) or the " Left Button " ( 3-3, Fig. 1 ) to adjust
the required emissivity value.
Press the " Emissivity Button " continuously for at least 2
seconds again. The emissivity value will stop flashing.
Release the button, the adjustment procedures are
completely finished.
10
