Chauvin Arnoux C.A 1954 DiaCAm2, User Manual

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2. MEASUREMENT CAMPAIGN
By default, no measurement cursor is selected (selection of the
item in the Main/Display/Cursor menu), and the camera
produces only infrared images.
2.1. Estimating the temperature of an object without a cursor
It is possible to evaluate a temperature from the information of the colour palette. The distribution of the colours between the
minimum and maximum temperatures displayed at the ends of the palette is linear, so simply interpolating based on the position
of the colour in the palette gives the temperature sought.
Example: if the colour of the zone of which the temperature is to be determined lies at the centre of the palette, the temperature
corresponding to this colour will be approximately Tmin + (Tmax – Tmin) * ½ = (Tmin + Tmax )/ 2, in other words the
mean of the min. and max. temperatures of the palette; if the colour lies in the 1st quartile, Tmin + (Tmax - Tmin) * ¼ etc.
2.2. Locating the cold and hot spots in the image
In the Main/Display/Cursor menu, choose the Min/Max cursors

they represent the minimum and maximum
temperatures in the image and display their values.
2.3. Measuring the temperature of a point in the image
In the Main/Display/Cursor menu, choose the Point cursor

it gives the temperature of a point. It can be moved on
the image using the arrow keys.
Place the cursor in the centre of the screen and aim so as to shift the point to the centre.
2.4. Determining the characteristics of a zone on the screen
In the Main/Display/Cursor menu, choose the Surface cursor

it indicates the mean, minimum, and maximum
temperatures of a square or rectangular area (the rectangular area has the same aspect ratio as the screen),
identified by the cursor.
Place the area in the centre of the screen, then aim so as to shift the target zone into this area.
Move this area using the arrow keys or adjust its size using the following combinations of keys: Up + Left to reduce it and Down +
Right to enlarge it.
2.5. Displaying the temperature profile of a line in the image
In the Main/Display/Cursor menu, choose the Profile cursor

; it highlights a horizontal line in the image (Up/Down
keys) and shows its profile. This cursor also identifies a point on this line (Left/Right keys) and indicates its
temperature.