Fahad Abrar Posted March 15, 2016 Author Share Posted March 15, 2016 They are not dual voltage. I think I will check all the power connectors, it could be that one of the connectors has reverse polarity and probably bring the equipment back into to lab for some more testing. If the lab tests are ok then we know its the wiring and definitely a ground loop. Quote Link to comment Share on other sites More sharing options...
Hillbilly Posted March 15, 2016 Share Posted March 15, 2016 I realise it will be a pain but if you try powering the cameras up from a battery to see what pictures you get at the monitor side. Quote Link to comment Share on other sites More sharing options...
Fahad Abrar Posted March 16, 2016 Author Share Posted March 16, 2016 So to summarise I see the following might the issue and these are the things that can be done: Â 1. One of the cameras may be on reverse polarity 2. It doesn't seem like a ground loop issue, however as I said that I can feel the tingle when I touch the BNC connectors at the back of the DVR. 3. I should bring the equipment back to lab and test it. 4. Most likely to be a power issue, however I have tested with a bigger boxed 10A supply but the same problem persists. Â Please advise if I am missing some points. Â Thanks Quote Link to comment Share on other sites More sharing options...
al-yeti Posted March 16, 2016 Share Posted March 16, 2016 It's possible you have a potential on the earth in the building have seen this before , it was resolved by correcting a fault in a socket , however tingling on the bncs maybe a side issue, as those lines or bars or whatever we call them "shouldnt" cause that , maybe it's the power unit, I have seen toroidal transformers cause this in a similar way As above stick a battery on them and see what happens , if DVR is 12v input then even easier you can stick it all on a battery Quote Link to comment Share on other sites More sharing options...
Alpat Systems Posted March 16, 2016 Share Posted March 16, 2016 (edited) What BNC connectors are you using? TVI can be very fussy with the BNC termination compared to "old style" analogue. Make sure when terminating the BNC that the foil shield and braiding on the cable is cut back so its well clear from the centre conductor/pin. You don't normally have to worry about this so much with analogue but I've witnessed a similar fault to what your describing. Just for test purposes try connecting the camera to the DVR using CAT5 and baluns Edited March 16, 2016 by Alpat Systems Quote Link to comment Share on other sites More sharing options...
Night Owl Posted March 16, 2016 Share Posted March 16, 2016 Second above, be extremly careful with the braid and core, happened to me only last weekend! Â Won't be reserve polarity as it would stop the other 3 from working. That looks like cabling issue, and if you've used that cabling before i'd point my finger at connectors. Â Have you tried sending a pattern down it? If so what are the results? Quote Link to comment Share on other sites More sharing options...
Fahad Abrar Posted March 17, 2016 Author Share Posted March 17, 2016 What's a pattern? Quote Link to comment Share on other sites More sharing options...
james.wilson Posted March 17, 2016 Share Posted March 17, 2016 What's a pattern? test pattern out of ur test mon Quote securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
al-yeti Posted March 17, 2016 Share Posted March 17, 2016 Well depends how old your are jw old pattern gens didn't have a monitor lol Quote Link to comment Share on other sites More sharing options...
Fahad Abrar Posted March 17, 2016 Author Share Posted March 17, 2016 Lol Quote Link to comment Share on other sites More sharing options...
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