ZMODO ZMD-DT-SCN4 - Manual (Page 13)

H.264 Super Digital Video Recorder User Manual
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signal lines. The high voltage current should be avoided especially.
Insure the connection stable and credible
The signal and shield lines should be firm and connected credible which avoid false and joint
welding and oxidation.
2.6.2 Video output device selection and connection
The video output is divided into PAL/NTSC BNC (1.0VP-P, 75 Ω) and VGA output(selective
configuration).And HDMI output( HDMI is optional).
When replace the monitor by the computer display, there are some issues to notice.
1、Do not stay in the turn-on state for a long time.
2、Keep the computer display normal working by demagnetizing regularly.
3、Stay away from the electro magnetic Interference.
2.6.3 The audio signal input
TV is not a credible replacement as a video output. It demands reducing the use time and control
the power supply and the interference introduced by the nearby equipments strictly. The creep age of
low quality TV can lead to the damage of other equipments.
Audio port is RCA connection.
The input impedance is high so the tone arm must be active.
The audio signal line should be firm and away from the electro magnetic Interference and
connected credible which avoid false and joint welding and oxidation. The high voltage current should
be avoided especially.
2.6.4 Audio output
1、
Commonly the output parameter of DVR audio signal is greater than 200mv 1K Ω (BNC) which can
connect the low impedance earphone and active sound box or other audio output equipments through
power amplifier. If the sound box and the tone arm can not be isolated, howling phenomena is often
existed. There are some methods to deal with the above phenomena.
2、
Adopt better directional tone arm.
3、
Adjust the sound box volume to be under the threshold that produces the howling phenomena.
4、
Use fitment materials that absorb the sound to reduce reflection of the sound.
2.7 Alarm input and output connections (Some models without this function, please prevail
in kind)
Adjust the layout of the sound box and the tone arm.
Please note the following:
１、
Alarm input
A. Alarm input is grounding alarm input.
B. Alarm input demand is the grounding voltage signal.
C. When the alarm is connected with two DVRs or connected with DVR and other equipments, it