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Intelli-FLEX II product guide • • • 7 - 5
Tapping the fence
The following procedure is used to simulate cut events. It is used when setting
the preamplifier gain. The purpose of this simulation is to copy the noise that is
made by cutting through a fence link.
There is quite a bit of variability in the noise that is made by cutting through a
fence link.
Some of the factors that affect this variability are the thickness and hardness of the
fence material, the sharpness of the cutters, the leverage of the cutters, and
whether or not the cutters push or pull on the link as the cut is made. Another
factor that affects the amount of noise made while cutting, is the tightness of the
fence fabric. If the fabric is under tension considerable secondary noise is
generated as the links of the fence pull back after being cut. After a number of
cuts are made to the fence, the fabric is usually pulled back to make a hole large
enough to pass through. This action creates even more noise.
Enough energy is generated during this process to set
off an alarm several times.
To adjust the gain for a fence it is necessary to create enough noise to reach
threshold. This can be accomplished simply with an object such as a screwdriver.
The impulse that is created by tapping a fence with a screwdriver is similar to that
caused by a bolt cutter snapping through the links of a fence.
How hard should the tap be?
The answer to this depends on how sensitive to intrusion the fence is required to
be.
The gain of the system may be set to respond to a pin
drop. With this level of sensitivity nuisance alarms would be a constant problem,
for instance with inclement weather.
is the preferred alternative. This level of sensitivity would
have a high probability of detection when a valid intrusion attempt is made, but
would not be affected by bad weather, (i.e., nuisance alarms would not be caused
by bad weather).
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To simulate a threshold event use a medium length screwdriver 20 to 30 cm
(8 to 12 inches) long.
as sensitive as possible
just sensitive enough