Chauvin Arnoux C.A 876 Notice De Fonctionnement page 18

Note: If the thermometer is OFF, pressing the MEAS button for more than
4 seconds will set the thermometer in the MIN/MAX record mode when
powered up.
Back-Light and
G
Press the button to turn the Back-Light ON.
Press the button again to turn the Back-Light OFF.
In , ALM Hi, ALM Lo, this button
displayed in the lower smaller display are. If held down, the value change
will increase in speed.
G Laser and Decrease Button:
• Remove the laser cover before use.
• Pressing this button makes the Laser toggle between ON and OFF.
is displayed in the upper left hand corner when the laser is available.
• The laser goes on only during the measurement; when MEAS is pressed.
blinks when the laser is ON.
• In , ALM HI, ALM Lo, this button
displayed in the lower smaller display are. If held down, the value change
will increase in speed.
Note: There is no ON/OFF button. The thermometer turns ON when the
MEAS button is pressed, and will automatically shut OFF after 15-20
seconds.
4.3 Distance from target / measurement field diameter ratio
This ratio, also called the field of vision, indicates the diameter of the
measurement field at a given distance from the target, D/Ø = 10/1 (see
figure below).
The minimum measurement distance is 150mm - this gives a
measurement spot diameter of 15mm.
In the case of small measurement points, it is important to bring the
probe sufficiently close to the target to avoid including other points in the
measurement field.
Diameter of measurement field
Ø 50
50
0
Distance from target
Increase Button:
increases the numerical value
decreases the numerical value
Ø 200 mm
Ø 150
Ø 100
100 150 200 cm
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