Fluke Ti32, User Manual

Page: 30 / 40

Ti32, TiR32
Users Manual
24
measurement on materials with a low emissivity, an emissivity correction is
often necessary. The easiest correction method is to set the Imager to the
proper emissivity value so the Imager automatically calculates a corrected
surface temperature. If the Imager uses a fixed emissivity value (meaning that
it is set to one value and the user cannot adjust it), then the Imager’s
measurement must be multiplied by a value found in a look up table to get a
more accurate estimate of the actual temperature.
Regardless of an Imager’s ability to adjust for emissivity in calculating
temperature measurements, surfaces with an emissivity of 0.60, or lower, are
often difficult to obtain truly accurate temperature measurements without
significant error. It is always best to change or improve the emissivity of a
surface when possible if accurate temperature measurements are required.
Both the Ti32 and TiR32 have the ability to set emissivity by directly entering
a value or using a table of built-in values. Much information is available on
emissivity. Further study of this topic is recommended to get the most accurate
temperature measurements using the Imager.
Setting Emissivity
Setting your Imager with correct emissivity values is critical to making
accurate temperature measurements. To set the emissivity value:
1. Press
a
until Emissivity appears over
c
.
2. Press the softkey labeled Emissivity .
At this point, emissivity can be set directly as a value or selected from a list of
emissivity values for some common materials. To select from a list of common
materials:
1. Press the softkey labeled Table .
2. Press the softkey labeled
Up
or
Down
to move between the materials in
the list. The emissivity value for each material is shown on the screen as
the selection moves between the different materials
3. Press the softkey labeled
Done
to select the highlighted material.
To set the emissivity value directly:
1. Press the softkey labeled ε .
2. Press the softkey labeled Up or Down to increment or decrement,
respectively, the emissivity value displayed just above the softkey labels.