Gadspot S series User Manual
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Contents
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H.264 Super Digital Video Recorder User Manual122.6.3 The audio signal inputAudio 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 crediblewhich avoid false and joint welding and oxidation. The high voltage current should be avoided especially.2.6.4 Audio outputCommonly the output parameter of DVR audio signal is greater than 200mv 1KΩ (BNC) which can connectthe 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 somemethods to deal with the above phenomena.1、 Adopt better directional tone arm.2、 Adjust the sound box volume to be under the threshold that produces the howling phenomena.3、 Use fitment materials that absorb the sound to reduce reflection of the sound.4、 Adjust the layout of the sound box and the tone arm.2.7 Alarm input and output connections (Some models without this function, please prevail inkind)Please note the following:１、Alarm inputA. 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 should beisolated by relay.２、Alarm outputAlarm output can not be connected with high-power load (no more than 1A).When forming the output loop itmust prevent the big current from relay damage. Use the contact isolator when there is a high-power load.3、Front equipment grounding noteBad grounding can lead to the burnout of the chip.4、Alarm input type unlimited |
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