4.2.4.5 Measurement Distance
Measuring distance refers to the distance between the target being measured and the lens of the thermal
imager. This parameter is mainly used to compensate for the thermal radiation absorbed by the
atmosphere between the target and the lens of the thermal imager.
Click to enter appopriate distance value to save
！
Note
：
for short distance and less than the furthest accurate measurement distance, the relative
distance value is usually set as default
4.2.4.6 Outer Optical Transmittance
1. External optical transmittance refers to the transmittance of any external lens or infrared window
used in front of the lens of a thermal imager.
Click
and
or scrool
to adjust (0.1
—1.0)
！
Note
：
If the selected external optical lens has been calibrated at the factory, or there is no external
infrared window, the external optical transmittance is usually set as default
