Distance & Spot Size - RayTek Raynger ST ST20 Pro Standard Manual Del Usuario

Distance & Spot Size
As the distance (D) from the object
increases, the spot size (S) of the area
measured by the unit becomes larger.
The relationship between distance and
spot size is 12:1 at the focus point
(0.914 meter/36 inches). The spot sizes
indicate 90% encircled energy.
Laser Sighting
The circular laser is made up of eight laser
spots that form a circle to show the approxi-
mate area being measured; a single laser
spot shows the center of the measurement
area. In low-light conditions, lighter spots
surrounding the laser circle may appear.
These spots are not used for aiming purpos-
es. Use only the laser circle to aim the unit.
With single point laser sighting, the laser
point shows the center of the area measured.
Reminders
When measuring at short distances (.5 meters or 1.5 feet), be sure to point the
thermometer using the sighting guides on the top of the unit, to compensate for
the offest of the laser circle.
Not recommended for use when measuring shiny or polished metal surfaces
(stainless steel, aluminum, etc.). See "Emissivity" for measuring these surfaces.
The unit cannot measure through transparent surfaces such as glass or plastic.
It will measure the surface temperature of these materials instead.
Steam, dust, smoke, or other particles can prevent accurate measurement by
obstructing the unit's optics.
38mm @
300mm
D
12
=
S 1
1.5"
@ 12"
English
75mm @ 132mm @
900mm 1500mm
3" 5.3" @
@ 36" 60"
D
S
7