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A. Test that the camera has the correct voltage supplying it, you must do this with the camera connected so that there is load on the PSU. A 12V DC camera should have at least 10.5V DC connected to it.

 

B. The camera can not function without the correct power supply. For 12V DC cameras only ever use regulated power supplies so that you can be sure that the camera is always receiving the correct voltage.

 

C. Ensure that the BNC – BNC lead that you connect between the camera and DVR has no shorts or open circuits. If you are making your own lead, don’t forget the lead must have two wires connected to complete the circuit, Video and Ground.