Field Of View; Emissivity; Hold - Fluke 572-2 User Manual

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Infrared Thermometer

Product Operation

Field of View

For accurate measurements, make sure that the target is larger than the Product

spot size. The smaller the target, the closer you should be to it (see Figure 6).

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Figure 6. Field of View

Emissivity describes the energy-emitting characteristics of materials. Most organic

materials and painted or oxidized surfaces have an emissivity of approximately

0.95, the default setting for the Product.

To compensate for inaccurate readings that may result from measuring shiny metal

surfaces, you can cover the surface to be measured with electrical tape or flat black

paint (<148 C/300 F) with emissivity set to 0.95. Allow time for the tape or paint to

reach the same temperature as the surface beneath it. Measure the temperature of

the tape or painted surface.

If you cannot paint or use tape, then you can improve the accuracy of your

measurements by either numerically adjusting emissivity or by using the Emissivity

Menu to access a table of some common materials. The Product has numerically-

adjustable emissivity from 0.10 to 1.00 that can be used in conjunction with the

emissivity in Table 3. Also, the Product has a built-in table of the most common

materials that can be set from the Emissivity menu. The built-in values are indicated

in Table 3.

The display retains its last infrared measurement for twenty seconds when the

trigger is released, when HOLD is shown on the display. With the probe inserted,

the contact thermometer remains on. To freeze the infrared temperature when a

probe is not inserted, release the trigger until HOLD shows on the display.

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