Fluke 62 Max Application Note How Hot? Use The Spot.

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Application Note

How hot? Use the spot.

Temperature is the second most common measurement in

the world (the first is time). For something that is measured

so often, wouldn’t it be great to have a thermometer that’s

as easy to carry and as fast to read as your wristwatch? Fluke’s family of infrared (IR)

thermometers gives you speed

and convenience. Point. Squeeze.

Read the results. It’s quick and

easy, and helps you get your job

done faster.

In addition, Fluke’s newest

infrared thermometer adds

another element—improved

targeting for increased accuracy.

The Fluke 62 MAX+ provides

two targeting lasers to help you

better see “the spot.” To better

understand how the 62 MAX+

will help you, let’s take a look at

what the spot means.

For anyone who uses an IR

thermometer, understanding

the measurement spot is key

to getting accurate measure-

ments. Think about using the

spot in the same way you see

things with your eyes. If you’re

up close to an object, you can

see only the things directly in

front of you. As you move farther

back, your field of view expands

and you see a much wider

perspective.

The formal name for this is

“distance to spot ratio.” If your

thermometer has a 10:1 distance

to spot ratio, and you are 10

inches away from your target,

you will measure the tempera-

ture of a one-inch circle. If you

are 10 feet away, your measure-

ment spot will be a one-foot

circle.

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.

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