Chauvin Arnoux C.A 1954 DiaCAm2, Руководство пользователя

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3. MORE PRECISE MEASUREMENT CAMPAIGN
3.1. Good practices

Make the measurement in the central zone of the screen.

Aim head on, not at an angle.

Measure scenes that are large enough. Avoid point-like scenes.

Following a variation of ambient temperature, wait for the camera to stabilize.

If the storage batteries have warmed up during charging, wait before putting them back in the camera.
3.2. Use influencing parameters consistent with the conditions of measurement
The flux received by the camera depends:

on the emissivity of the object observed,

on the temperature of the environment,

on the distance to the target,

on the relative humidity of the air.
The emissivity is the most crucial of the adjustments, whatever the measurement context.
The higher the relative humidity and the greater the distance, the larger the influence of the relative humidity.
The relative humidity, the ambient temperature, and the distance are likely to vary more significantly outdoors.
The measurement context may not match the default settings, leading to measurement errors that may be large. For this reason,
manual or "user" compensation is proposed to allow adjustment of these parameters.
Attention! Incorrect settings of the various parameters can lead to an aberrant result, possibly worse than that
obtained with the default parameters.
3.2.1. Using the default compensation for the influencing factors
The default compensation for the influencing factors matches
the context of calibration of the camera
(
example: the emissivity is set to 1.00, the distance to 0.5m,
the relative humidity to 50%, and the ambient temperature to
25°C
).
In this case, the parameters cannot be customized and are
displayed shaded in the Main/Target menu.
The value of the emissivity in the status bar is replaced by the
symbol .
If the emissivity of the object observed is close to this, and so
are the environment parameters, this calculation mode can be
used.
This is also the case if the operator does not need very precise
measurements (search for thermal bridge or temperature
difference).