Re: CCTV cameras: single PSU or individual PSUs ?
Check grounds.
Easy to test that theory: temporarily replace long cables with shorter ones, shared power supply with individual ones, etc. You may discover the cables are routed too close to an RFI/EMI noise source. Or, any Ir emitters in the camera(s) are pulling down the supply when they switch on, etc.
[I had a camera that kept wanting to cycle between day and night modes. Each transition put a drag on the power supply that the flimsy wiring couldn't accommodate (without additional local bypass AT the camera).]
Knowing the possible cause of your problem(s) is the first step towards creating a workable remedy.
Originally posted by Dannyx
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It could be the new power boxes we installed, combined with the relatively long cable runs which carry 4 video signals at once (one on each pair)...we usually don't do it like this (we run individual cables for each camera), but the system was already in place so we had to use it, as it was too expensive/difficult to run new wires.
[I had a camera that kept wanting to cycle between day and night modes. Each transition put a drag on the power supply that the flimsy wiring couldn't accommodate (without additional local bypass AT the camera).]
Knowing the possible cause of your problem(s) is the first step towards creating a workable remedy.
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