dallmeier DDF4920HDV-DN-IM, Пусконаладка

Страница: 13 / 44

www.dallmeier.com 13
Commissioning DDF4920HDV-DN-IM
• Always disconnect the separate 12 V DC power supply unit from the mains
socket (pull out the power plug) before connecting or disconnecting the device.
• In order to comply with UL’s requirements, always use a UL-certified, Limited
Power Source (LPS) Class 2 power supply unit when operating the device with a
separate 12 V DC power supply unit.
• When using a separate 12 V DC power supply unit, interference caused by a
ground loop may occur in the analog video signal. In this case, use a video
signal transformer (balun) for galvanic (ground) isolation between the signal
source (camera) and the RG-59 cable.
• If the device or the cables connected to the device are located near sources
with strong radiation, the video image may be distorted.
• The device is equipped with automatic gain control (AGC). In low light condi -
tions the image may be altered (e.g. noise). However, this is not a camera
malfunction.
• The quality of the video image depends on the lighting conditions and the used
monitor.
• The accuracy of the automatic white balance (AWB) algorithm depends on the
used lighting. Mixed light (consisting of artificial light and daylight) may cause
color distortions (inaccurate color reproduction).
• Poor lighting can lead to an incorrect white balance.