NightWatcher HVR5006D-E User Manual
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NightWatcher D1 Digital Video Recorder User Manual132.6.3 Audio inputThe audio port is an RCA connection.The input impedance is high so the tone arm must be active.The audio signal line should be firm and away from any electro magnetic interference and eliminate any poorjoint welding and oxidation. A high voltage current should be avoided especially.2.6.4 Audio outputThe output parameter of the DVR audio signal is greater than 200mv 1KΩ (BNC) which can connect to a lowimpedance earphone and active speaker or other audio output equipment through a power amplifier. If thespeaker and the tone arm cannot be isolated, there may be a problem with feedback. There are certain method todeal with the above issue;1、 Adopt better directional tone arm.2、 Adjust the speaker volume to be below the threshold that produces feedback.3、 Use materials which absorb the sound and reduce sound reflection.4、 Adjust the location of the speaker box and the tone arm.2.7 Alarm input and output connections (Only available on certain products.)１、Alarm inputA. Alarm input is grounding alarm input.B. Alarm input demands the grounding voltage signal.C. When the alarm is connected with two DVRs or connected with DVR and other equipment, it should beisolated by relay.２、Alarm outputAlarm output cannot be connected with a high-power load (no more than 1A).When forming the output loopit must prevent the big current from relay damage. Use the contact isolator when there is a high-power load３、PTZ decoder connectionsA. The grounding of the PTZ decoder and DVR must be shared otherwise the common-mode voltage willlead to the PTZ control failure. A shielded twisted pair is recommended.B. Avoid the input of high voltage, ensure a reasonable layout and take precautions from lightning.C. In the outlying end connect 120Ω resistance in parallel to reduce inflection and ensure signal quality. |
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