Fluke TI450 SF6 User Manual - Page 33

Emissivity Adjustment, Adjust by Number

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Thermal Imagers Menus Emissivity Adjustment The correct emissivity values are important for the Imager to make the most accurate temperature measurement calculations. Emissivity of a surface can have a large effect on the apparent temperatures that the Imager observes. Understanding the emissivity of the surface being inspected can, but not always, allow you to obtain more accurate temperature measurements. If you set a value that is

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Thermal Imagers
Menus
29
Emissivity Adjustment
The correct emissivity values are important for the Imager to make the most
accurate temperature measurement calculations. Emissivity of a surface can
have a large effect on the apparent temperatures that the Imager observes.
Understanding the emissivity of the surface being inspected can, but not
always, allow you to obtain more accurate temperature measurements.
If you set a value that is
<
0.60,
W
shows on the Imager display with this
caution:
W
Caution:
Emissivity <0.6
(see Manual)
Note
Surfaces with an emissivity of
<
0.60 make reliable and consistent
determination of actual temperatures problematic. The lower the
emissivity, the more potential error is associated with the Imager's
temperature measurement calculations. This is also true even when
adjustments to the emissivity and reflected background adjustments
are performed properly.
Emissivity is set directly as a value, or from a list of emissivity values for some
common materials.
Note
If the Display is set to
Display All
, you see the information about
current emissivity as
ε
= x.xx
.
Adjust by Number
To set the emissivity value:
1.
Go to
Measurement
>
Emissivity
>
Adjust Number
.
2.
Push
/
to change the value.
A custom emissivity value is indicated when any value not in the standard
emissivity table is selected.