Q-See QT446 Manuel d'utilisateur télécharger pdf (Page 25)

Because your camera is weatherproof, it requires less protection than weather-resistant cameras

and it can be placed in more exposed locations if needed. Keep in mind that most Q-See

cameras are designed to operate between -40°F to 122°F (-40°C to 50°) with a relative humidity

of up to 95%) and consider wind chill and other environmental factors when selecting your

location.

Specialty cameras are also available from Q-See which are able to operate in more extreme

environments.

ADDITIONAL CONSIDERATIONS

Most users prefer to operate their systems with the NVRs recording only when motion is

detected. This provides the most efﬁcient use of the hard drive’s capacity, plus making it easier

for a recording to be located. However, if the a camera’s location has a lot of “environmental”

motion, such as a fan, wind, or the like, you will receive a lot of “false alarms.” Usually, these

events can be avoided by simply adjusting the placement of the camera. Other situations may

require some ﬁne-tuning of your settings. Chapter 8 Alarms, covers these settings in detail,

but some easily avoidable situations are presented below:

TV/Computer Screens. If the camera can see a video screen, it will trigger a motion alarm

any time the screen changes, whether there is a video or simply a screen saver. The screen can

be masked out as described in Section 4.2. You can also reduce the level of motion sensitivity

in speciﬁc areas of the screen by following the instructions in Section 8.3.

Fans/Machinery. Motion is motion and if machinery within the camera’s ﬁeld of view starts

automatically, it will cause an alert. Similarly, if the camera is mounted on a wall with machinery on

the other side that causes it to vibrate, that can also cause it to detect motion. Moving machinery

within the camera’s ﬁeld of view may be masked off as mentioned above, or motion detection may

be turned off for that channel. If there is another camera that covers access to the area where the

machinery is located, you can set it so that the ﬁrst camera will only be recording when triggered

by a motion event detected by this second camera. See “Triggers” in described in Section 8.3.

Bugs. An occasional insect ﬂying through the ﬁeld of view is usually not enough to trigger an

alert. However, some ﬂying insects are attracted to infrared light and will swarm the camera.

This is usually a temporary situation that occurs at only a certain time of the year. Lighting the

area with yellow “bug light” of sufﬁcient brightness can keep the camera operating in daylight

mode and keep the infrared LEDs turned off. A second solution is to set the channel to record all

the time, and turn motion detection off at night until “bug season” is over. Reducing the motion

sensitivity (Section 8.3) can also reduce alerts as can using another camera to trigger recording

as described above.

Additionally, keep your cameras clear of spider webs as the movement of the webs due to wind

or critters in the web will cause an alert. The reﬂection of the infrared off the webs and back into

the camera will also reduce the night vision range.

Snow/Rain.

As with bugs, this is usually a seaonal event and may require motion detection to be

temporarily disabled to avoid false alarms. However, positioning the camera further under shelter,

such as closer to the wall and away from the edge of the eaves, can make the rain or snow too

small for the camera to notice. Adjusting motion sensitivity may also help in some situations.

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Q-See QT446 Manuel d'utilisateur Page 25