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6.3 Detail-Setup
6.3.4 Sabotage:
Up to 3 different kinds of sabotage detections can be defined for each of the four
channels:
teration, like twilight, common changing of weather conditions.
At the same time an arithmetic mean is registered over a short time of 10 seconds. In-
tensity changes by moving objects effects no alarm. A durable change like covering of
the camera objective or a lasting local variation in the camera picture causes a sabo-
tage alarm. In this case after 5-10 seconds an alarm is occurred.
The alarm threshold can be adjusted in 9 steps. In case of outdoor areas (short-term in-
tensity changes by sun or clouds) it is recommended to set the threshold to higher sig-
nal deviation.
Signalcharacteristic
By activating of this function a reference value will be initiated, however as an average
difference of the arithmetic mean. The calculation is done for the distribution of all inten-
sities within the camera picture. This feature is especially recommended for high-
contrast images, because sabotage by paint-spraying to the camera objective or distort-
ing of the camera-view effects a bad-focused and low-contrast image in the most cases.
The reference value is adapted dynamically. The notes for alarm activating and the
alarm threshold are performed as described in „Videosignallevel‟.
A sabotage alarm can be indicated by energizing the sabotage relay and / or by sending
a serial sabotage string (definition for each channel; character entry and interface defini-
tion as described in „Alarm‟ on page 28).
The relay is energized as long as the sabotage is detected.
The transmission of the serial string starts with detecting a sabotage and – setting „re-
peat‟ is activated – each second anew..
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Video fail
When a video signal fails – channel
is activated (see Camera Tool Bar),
no video signal has been applied to
the input – the LED of the corres-
ponding channel flashes on the
front side of the device.
Videosignallevel
When this function is activated an
arithmetic reference value (for all
picture intensities within the defined
green area prealarm3) over 5 mi-
nutes will be calculated in order to
take account of slow luminance al-
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