Fluke Ti480 - Adjusting Level;Span and Emissivity; Level;Span Adjustment Procedure; Emissivity Adjustment Guide

Ti200, Ti300, Ti400, Ti450, Ti450SF6, Ti480
Users Manual
14
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 9.
See Detailed Specifications for more information about the minimum span.
Note
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.
 Warning
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.
Note
Surfaces with an emissivity of
< 0.60 make it difficult to determine reliable and consistent actual
temperatures. The lower the emissivity is the greater the potential of error is when the Imager
calculates the temperature measurement because more of the energy reaching the camera is
specified as background temperature. This is also true even when adjustments to the emissivity
and reflected background adjustments are performed properly.