Emissivity Adjustment - Fluke Expert Series User Manual

To change the Level/Span:
1. Select Measurement > Level/Span > Manual.
2. Select Set Level/Span.
3. Push:

• to decrease the temperature span.

• to increase the temperature span.
• to move the span to a higher temperature level.

• to move the span to a lower temperature level.

The scale along the right side of the display shows the thermal span increasing or decreasing
in size and shows the span as it moves to different levels within the total range. See Table 10.
See Detailed Specifications for more information about the minimum span.
The Imager always powers up in the same Level/Span mode, Auto or Manual, as
when the Imager was powered down.

Emissivity Adjustment

All objects radiate infrared energy. The actual surface temperature and emissivity of the target
affects the quantity of energy radiated. The Imager senses the infrared energy from the
surface of the target and uses the data to calculate an estimated temperature value. Many
common materials such as wood, water, skin, cloth, and painted surfaces, including metal,
radiate energy well and have a high emissivity factor of ≥90 % (or 0.90). The Imager measures
temperatures accurately on targets with a high emissivity.
Shiny surfaces or unpainted metals do not radiate energy well and have a low emissivity factor
of <0.60. For the Imager to calculate a more accurate estimate of the actual temperature of
targets with a low emissivity, adjust the emissivity setting.
To prevent personal injury, see emissivity information for actual
temperatures. Reflective objects result in lower than actual
temperature measurements. These objects pose a burn hazard.
Set emissivity as a direct value or from a list of emissivity values for some common materials.
If the emissivity value is <0.60, a caution shows on the display.
Shop for Fluke products online at:
Note
 Warning
MyFlukeStore
www.
Expert Series Thermal Imagers
1.888.610.7664
.com
Menus
17