Locating A Hot Or Cold Spot; Distance & Spot Size - RayTek AUTOPRO Handbuch

To change the 9V battery, attach the battery to the
battery snaps with the positive side toward the
rear of the battery compartment.
How to Accurately Measure
Temperature
Laser Sighting
Laser sighting consists of 2 lasers. These lasers
are aimed at different angles. The point at which
the two laser points intersect (thermometer
focused) is 8 inches (200 mm). This is also the
optimum measuring distance.
To sight object being measured, press trigger to
turn on laser sight. Only one laser point should be
seen when at optimum measuring distance (1). If
two laser points are visible (2), adjust distance of
unit from object being measured. If it is not pos-
sible to adjust the distance, see Distance & Spot
Size information.
Distance & Spot Size
The relationship between distance and spot size
is 16:1 at the focus point (200mm: 13mm or 8
inches: 0.5 inch). As the distance (D) from the
object decreases or increases, the spot size (S)
of the area measured by the unit becomes larger.
The spot sizes indicate 90%-encircled energy.
Emissivity
Emissivity is a term used to describe the energy-
emitting characteristics of materials. Most organic
materials and painted or oxidized surfaces have an
emissivity of 0.95 (pre-set in the unit). Inaccurate
readings can result from measuring shiny or
polished metal surfaces. To compensate, cover
the surface to be measured with masking tape or
flat black paint. Allow time for the tape or paint
to reach the same temperature as the material un-
derneath it. Measure the temperature of the tape
or painted surface.

Locating a Hot or Cold Spot

To find a hot or cold spot, aim the thermometer
outside the area of interest. Then scan across the
area with an up and down motion until you locate
the hot or cold spot.