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Camera losing colour

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Hi Guys,

we have a 14 camera system installed at clients offices. 3 of the 14 internal cameras (dome infrared) are giving a black & white image half way through the day.

 

If i power them off then on, the problem goes away but seems to come back after a few hours?

 

2 of the cameras are on 40 metres runs and the other is on a 20 metres run all over cat5e with passive video baluns on both ends? Using a 10amp 16 way 12v power supply unit. (Am I overusing the maximum 10amps???)

 

anyone come accross any problems such as this? any advice on what i could look at?? I'm due to go back to site on thursday so would not mine some advice on what I could try.

 

Thanks

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Sounds like voltage drop issue, not enough power at 40 meters to sustain the camera's. Hope this helps.

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Whats the current rating of each camera, as if you have 14 cams on a 10amp 16 output supply thats a max of 710ma ish per camera, you may well be pushing that power supply a bit hard (but depends on how much current they need with the IR on, should be stated in the manual). Plus the problem with voltage drop as mentioned.....

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Hi guys thanks for your replies, I went back today and using a multimeter I checked the voltage at camera end and it was 12v no drops for the period I was there.

 

I have done two things today, 1st thing was to change the camera on one of them, and then I used a 12v wall adapter to power the other. I was just curious to see if any of these changes would make a difference. If either one does I may have cracked it.

 

Weired thing is when I unplug the bnc from the dvr end and then reconnect the picture is fine again. But then ater a few hours the picture goes mono again. I am starting to think it may be a Video balun issue???

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maybe the camera has a defective light sensor for the IR ?

 

that switches the camera to the B&W mode when the IR lamps come on.

 

just a thought.

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Hi,

 

What do you mean by dome infrared? Just to clarify. Are these day/night cameras that are going mono at the wrong time or colour cameras that are going mono.

 

I don't suppose you can connect an oscilloscope and do you know what a colour burst is? Perhaps the colour burst is being degraded for some reason. If the colour loss is regular can you unhook from the dvr and go straight into a monitor and check if it still goes mono.

 

I wouldn't have expected baluns to have problems over such sort distances but weirder things have happened.

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