Application Note

2 Fluke Corporation How hot? Use the spot.
Figure 1 shows an example
of why this is important. In
the illustration, a hot pipe is
mounted on a brick wall. On
the left side of the illustration, a
user takes a measurement from
a distance where the spot covers
not only the hot pipe, but also
the cooler brick wall. The read-
ing shows the average of the
entire spot. On the right side, the
user has moved closer and the
spot is smaller. The thermometer
gives an accurate reading of the
temperature of the hot pipe.
The most common IR ther-
mometers use a single laser in
the center of the spot. If you can
do the mental math to estimate
the measurement spot, great.
But the Fluke 62 MAX+ offers a
different approach, using dual,
rotating lasers to show the
outside of the circle that defines
the measurement spot. In other
words, with the 62 MAX+, the
spot is between the dots.
Figure 2 shows the same
example of a hot pipe mounted
on a brick wall, but using the 62
MAX+ with dual, rotating lasers.
With dual lasers, it becomes easy
for the user to visualize the size
of the circle that is being mea-
sured. The results are the same,
but it is easier for the user to see
and measure exactly what was
intended.
Laser-targeted infrared ther-
mometers are great tools for
making fast temperature mea-
surements. To improve accuracy,
users should understand the size
of the measurement spot. And to
really stay ahead of the game,
use an IR thermometer with
dual lasers that define the outer
edges of the spot.
75°
75°
225°
Figure 1
Figure 2
Fluke Corporation
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©2012 Fluke Corporation.
Specifications subject to change without notice.
Printed in U.S.A. 5/2012 4221738A_EN
Modification of this document is not permitted
without written permission from Fluke Corporation.
Fluke. Keeping your world
up and running.
®