Calex Thermosight Series, User Manual

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3.3. Measuring
By pulling the trigger to the first position the instrument is turned on and starts
to measure. The trigger can be locked in this position with the lock-key.
Lock Key
Trigger
24
3.4. Spot size
The size of the spot depends on the distance to the target object.
8
After an internal check (about 0.5 s), the measured temperature appears on
the display. At the RS-232-interface the values are also supplied at a time base
of 100 ms.
After releasing the trigger the last measured value is displayed, the output via
interface stops.
In the upper right corner of the LCD display the “HOLD” symbol appears. The
instrument remains for another 10s in standby and then turns off automatically.
After switching on the instrument again, the MAX, MIN, DIF and AVG values
are reset.
0 mm
0 mm
350 mm
50 mm
650 mm
96 mm
2000 mm
200 mm
20 mm
20 mm
17.5 mm
11 mm
13 mm
2.3 mm
80 mm
24 mm
Spotdiameter
Measuring
Distance
Spotdiameter
Measuring
Distance
The spot diameter for distances longer than 650 mm can be calculated
according to the following formula:
M = 0 .05 * a - 20 (all values in mm)
M - Diameter of the spot
a - Distance between targeted object an instrument
The close-up lens (accessory) reduces the spot diameter to 2.3 mm at a
distance of 96 mm.
Then the emissivity
e
has to be set according to the following formula:
(with
e
= the real objects emissivity)
Object
e
= 0.72 *
e
Object
When using the close-up lens the spot diameter for distances larger than
96 mm can be calculated according to the following formula:
M = 0.23* a - 20 (all values in mm)
M - Diameter of the spot
a - Distance between targeted object and instrument