C) Ir Measuring Spot Size - Ratio Measuring Distance:measuring Surface - VOLTCRAFT IR 650-16D Bedienungsanleitung

To determine the hottest spot on the measured object you have to scan the object,
with the measuring button held down, in a zigzag motion until you find the hottest spot.
When the MAX temperature function is active, the highest measured temperature
appears at the top of the display during measurement.
In order to obtain exact measured values, the infrared thermometer has to be adjusted
to the ambient temperature. Allow the device to adjust to the ambient temperature
after relocation.
Shiny surfaces affect the measured result. To compensate, the shiny part of the
surface can be covered with adhesive tape or matt black paint.
The device cannot measure through transparent surfaces such as e.g. glass. Instead,
it measures the surface temperature of the glass.
Prolonged measurement of high temperatures at near measuring distances leads to
self-heating of the measuring device and thus to inaccurate measurements. In order to
obtain exact measured values, remember the following rule of thumb: The higher the
temperature, the greater the measuring distance and the shorter the measuring time.
c) IR measuring spot size - Ratio measuring distance:measuring
surface
• In order to obtain precise measuring results, the measured object must be larger than the IR
measuring spot. The measured temperature is calculated using the average temperature of
the measured area. The smaller the object, the closer it must be to the thermometer.
• The exact size of the measuring spot is shown in the following diagram. It is also indicated on
the thermometer. To ensure precise measurements, the measured object should be at least
twice the size of the measuring spot.
Distance : Spot = 16:1
30
1in@25mm
0.5in@12.5mm
8in@200mm
16in@400mm
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