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Installation and Connections
20
Audio Output
The audio output signal parameter is usually over 200mv 1KΩ (BNC). It can
directly connect to low impedance earphones, active sound box or
amplifier-drive audio output device.
If the sound box and the pick-up cannot be separated spatially, it is easy to
cause a squeaking noise. In this case you can adopt the following
measures:
• Use better sound pick-up with better directing property.
•
Reduce the volume of the sound box.
•
Use more sound-absorbing materials in decoration to reduce voice
echo and improve acoustics environment.
• Adjust the layout to reduce the occurrence of the squeaking.
Alarm Input and Output Connection
Please refer to the following sheet for alarm input and output connection.
There are two alarm input types for you to select: normal open (NO) and
normal close (NC).
1. Alarm input
a Please make sure alarm input mode is grounding alarm input.
b Grounding signal is needed for alarm input.
c When you are connecting two DVRs or connecting one DVR and
one other device, please use a relay to separate them
2. Alarm output
The alarm output port should not be connected to a high power load
directly (It shall be less than 1A) to avoid high current which may result
in relay damage. Please use the co contactor to realize the connection
between the alarm output port and the load.
3. Please make sure the front-end devices have been well earthed.
Improper grounding may result in chip damage.