Measurements
7
Figure 7.6 Thermocouple reading display.
When a thermocouple is connected, the MAX, MIN, AVG, and DIF readings
are not available.
7.7.1 Using a Thermocouple to Find Optimal Emissivity Settings
The thermocouple is useful in finding the correct emissivity for a surface. As
described below, the emissivity setting is correct if contact and non-contact
temperature measurements, of the same spot, yield the same reading.
1. Perform a contact measurement (thermocouple) of a surface and note the
reading.
2. Perform an IR non-contact measurement of the same surface and note
the reading.
3. Adjust the emissivity and recheck the IR non-contact measurement.
4. Repeat steps 1, 2, and 3 until both measurements give the same tempera-
ture reading.
5. The emissivity will then be correctly set for the surface under test.
#NAS100131; r. AC/92852/92852; en-US
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