©
CIAS Elettronica S.r.l.
Ed. 1.0
Installation Handbook
page
44
of
59
MANTA 50 – 80
l. Select by the “function switch”
SW1 position 4
. The
alarm thresholds
adjusting phase and
the
walk test
phase are activated. The two alarm thresholds are set under and over the rest
field value. They are higher compared with the corresponding prealarm threshold, and are
used to evaluate, at the end of the analysis process, if the field value change is enough to
generate an alarm event.
To
read
the present alarm threshold value operate as follow:
•
Rotate decimal switch
SW2
(tens column) until the second red led (
D9
) becomes ON .
•
Rotate decimal switch
SW3
(units column) until the first red led (
D8
) becomes ON .
The reading values will be included between 01 and 80 (
default value 30
)Decreasing the
threshold value the sensitivity increase like the beam dimension.
To
modify
the present value increasing the sensitivity it is necessary to set, by means of the
two switches SW3 and SW2, a lower value and then push the button S3. To decrease the
sensitivity, it is necessary to set, by means of the two switches SW3 and SW2, a higher
value and then push the button
S3
. During this phase (
SW1 position 4
) it is also possible
to make the walk test. The barrier works using the present thresholds, and any change in
MW field strength received (for example due to an intruder moving in the sensible beam),
causes the activation of a pulsed sound produced by the on board buzzer. The pulse
frequency is proportional to the level change of the received microwave signal. If the pulse
frequency increases it means that, the level change of the received microwave signal, is
increased and therefore, it means, that the intruder is penetrated, deeply, in the protection
beam. If at the end of the analysis process, an alarm event is generated, the sound of the
buzzer become continuous (not pulsed). This allow to check the actual dimension of the
protection beam an also to verify if something movable in the protected area, like not well
fixed fences, can produce some trouble.
m. Select by the “function switch”
SW1 position 5
. The
masking thresholds
adjusting phase is
activated. The two masking thresholds are set under and over the installation absolute field
value (VRAG) memorized during the phase 2 (see previous point j). They are used to check if
the changes of the absolute microwave field received are so large to decrease or cancel the
detection ability of the barrier. A thick layer of snow can produce this kind of changes, but
someone can produce them intentionally, in order to mask the receiver.
To
read
the present masking
threshold value operate as follow:
•
Rotate decimal switch
SW2
(tens column) until the second red led (
D9
) becomes ON .
•
Rotate decimal switch
SW3
(units column) until the first red led (
D8
) becomes ON .
The reading values will be included between 01 and 80 (
default value 60
)
Decreasing the threshold value the sensitivity of the anti masking evaluation increase.
To
modify
the present value increasing the sensitivity (smaller changes produce masking
alarm) it is necessary to set, by means of the two switches SW3 and SW2, a lower value
and then push the button S3. To decrease the sensitivity (bigger changes produce
masking alarm), it is necessary to set, by the two switches SW3 and SW2, a higher value
and then push the button S3.
n. Select by the “function switch”
SW1 position 6
. The
higher
prealarm threshold
adjusting
phase is activated. During the phase k the two prealarm thresholds are positioned at the
same value. Increasing the value of the higher prealarm threshold, it is possible to activate the
Fuzzy Side Target Discrimination (FSTD)
, system. This unique system present in MANTA
barriers, allows to filter or completely reject, signals generated from something moving on
both side of protection beam, for example: not well fixed fences or bushes. The resulting
beam has an ellipsoidal shape.
Содержание MANTA 50
Страница 55: ...NOTE...
