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7
Measurements
In the HOLD mode you can scroll these reading memories for the previous
scanning session by pressing MODE. Each memory is cleared when the trig-
ger is pulled. Each mode is described below.
• MIN/MAX readings. The lowest and highest measurements.
• AVG reading. The average reading (the meter averages 20 readings).
• DIF reading. The MAX minus the MIN temperature.
When a thermocouple is connected, the MAX, MIN, AVG, and DIF readings
are not available.
7.5 Distance to Spot (D:S) Ratio
The TG series offers 20:1 (TG54–2) and 30:1 (TG56–2) D:S ratios. The D:S
ratio allows you to calculate the size of the measurement spot based on the
distance from the spot. Refer to the diagrams below.
TG54–2 D:S ratio 20:1
TG56–2 D:S ratio 30:1
Figure 7.4 Distance (D) to Spot (S) Ratio.
7.6 Emissivity Settings
The amount of IR energy emitted by an object is proportional to the object's
temperature and its ability to emit energy. This ability is known as emissivity.
Emissivity is adjustable in 0.01 steps from 0.01 to 1.00; the default value is
0.95. Set the emissivity in the programming menu (Section 9). Up to 5 preset
emissivity values can be set, allowing you to easily switch between commonly
used settings.
Set the emissivity based on the material and finish of the object you are meas-
uring. A flat black surface has an emissivity of 0.95. Preparing a surface with
flat black paint or tape simplifies the emissivity setting process. Shiny and
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