Chauvin Arnoux C.A 1864 Bedienungsanleitung Seite 23

4.2 MEASUREMENT PRECAUTIONS
•
If the surface to be measured is frosted over or covered in other particles,
if possible clean the surface so that it shows through and program in the
corresponding emissivity value (see § 4.4).
•
If the thermometer seems to give incorrect results, check the condition of
the measurement lens for condensation or other particles that could be
obstructing it. The lens should be cleaned carefully following the
instructions in § 6.3.
4.3 « TARGET DISTANCE / MEASUREMENT FIELD DIAMETER »
RATIO
This ratio, also known as the field of vision, indicates the diameter of the probes'
measurement field at a given distance from the target (see figure below).
C.A 1864 – C.A 1866
Spot diameter (S)
Spot diameter (S)
Laser beam
Sensor beam
Laser beam
Sensor beam
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