Precautions:
1. A camera with a 2.1 mm lens must not be installed less than 2.2 m above the ground; a camera
with a 2.8 mm focal length not less than 2.5 m; install an angle-mounted camera with a 30~70°
angle with the horizontal plane. See the specific installation illustration;
2. In a top-mounted camera, make sure the passenger flow direction is vertical to the line
connecting the two lenses of the camera (see the calibration illustration for details);
3. The ANPR (trigger lines) of the top-mounted camera shall be right under the camera; regarding
angle-mounting, adapt to the specific installation site in deciding where to place the ANPR;
4. The calibrated height or angle can differ from the actual height or angle; do several rounds of
calibration in this case to rule out occasional disturbance from the ground or lights. In calibration,
draw a large frame if possible to frame the ground inside. If abnormal data keeps coming up,
contact Dahua’s after-sales service;
5. Use this device where there is sufficient lighting;
6. Use this device indoor;
7. When using this device in a slightly dark environment, choose manual exposure and set the
exposure time to 0-10 ms;
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