atmospheric masses. Thus, the end of the field of view should be a stable thermal background
(something that changes temperature very slowly, like the earth or a concrete wall, etc.). See Fig
1.9. If the telescope seems to be giving false trips, the first thing to check (after verifying that there
is proper voltages to electronics and telescope) is the aiming, to make sure that detection of motion
of distant objects is not the source of unwanted alarm signals. REFER TO OPERATION, AND
ALIGNMENT SECTIONS. Passive infrared detection can perform exceptionally well under almost
all conditions.
Page 6
Figure 1.9 - Grounding with Actual Terrain
Telescope
Side
Road
Main
Road
Hill
