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rossibufc

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Posts posted by rossibufc

  2. Posted

    Hi all, i have just done an install of 12 Hikvision HD Turbo cameras, Hikvision Dvr with the HDMI output into an 1 in 8 out HDMI splitter out to 8 monitors. Why can i not get pictures on the monitors.

    If I plug monitors straight into DVR i recieve pictures. IF i use a different device other than the DVR eg PS4 or Sky box through splitter i can get pictures on all 8 monitors. I have have tried changing resolution on DVR but no joy.

    Any help would be great

     

    Cheers.

  5. Posted

    When you tested the camera on a battery were both the normal + and - power wires disconnected? Are the cameras that are OK v.s. not OK of the same type? In particular simple cameras usually have the power (-) connected internally to the video shield, often contributing to ground loops.

     

    In my minimal experience I've seen a wavy picture from either insufficient voltage at the camera, or a ground loop between the (-) and video shield. Also having long untwisted power wires raises a flag for me but the battery test should remove that possibility.

     

    All cameras are of same type Mark Mercer static domes and as you say - is connected to video shield.

    All voltages at the cameras are above 13v and I have tried a humbug ground loop isolater.

    On the battery test the power wires were disconnected but the lines were still there.

  6. Posted

    ya.... that's sounding more and more like a dud DVR

     

    Possibly but the cameras in question are not all connected to the same DVR as I have 7 DVRs on site and these cameras are spread over different DVRs. There are over 100 camers but only 1st and 2nd floors and now the 2 monitors on ground floor that have these lines.

  7. Posted

    Check connectors on the bad cameras, then once verified those are all okay, maybe the cable is near high voltage as mentioned. Also, did you try the cameras on a monitor at the DVR end, without the DVR?

     

    I haven't tried on a monitor without DVR and will give it a go.

    I think it must be to do with mains voltage somewhere but cannot find where as i have already got the electricians on site to cut power to 1st and 2nd floors but no change in pictures. And now the 2 monitors on the ground floor with same lines.

    Its really starting to annoy me now.

  8. Posted

    All cameras are powered from 2 x 10 way 5A Powerplex 12v dc psu. All CCTV circuits in the building are on the same phase. I have also tried powering one of the cameras from a 12v 7Ah battery for a few minutes to see if this helped but no change.All voltages at the cameras are in and around 13 to 13.5v.

    The power cable is 2 core 0.75mm flex and cable runs are between 5 to 60 metres so not long runs although RG59 runs are between 50 to approx 100 metres.

    Also checked camera locally with test monitor and picture is perfect.

    I have also just installed 2 x monitors with built in camers on the ground floor with the video run in twisted pair cable and baluns and these have the same lines although all other cameras on ground floor are perfect.

  9. Posted

    make sure your cables are ran far away from high voltage lines/ equipment.

     

     

    How far is far away?

    They run for about 4metres parrallel about 1ft away from armoured cables. However I got the electrician on site to turn off the power to these cables to see if the pictures would change but no joy.

  11. Posted

    Hi,

    I need some help regarding wavey lines on cctv pictures. I have done an installation on a building over 3 floors. On the ground floor the pictures are perfect but on the 1st and 2nd floors the pictures have wavey lines on screen back at the DVRs which are on the ground floor.

    Any help would be great.

    Cheers.

  12. Posted

    I have just installed 8 Mark Mercer PTZ domes for a customer and bought 2x 24v 5A 5way psu. When powerd up the cameras work fine but have lines running across centre of picture and are more visible when camera moves. I had an in line 24v 1A PSU sent by mark mercer for same tye of camera for a differant job, tried this on 1 of the cameras and cured the problem. I could be way off the mark but it looks to me that the 5A psu is getting interference off the 240V AC.

    Does anyone know a solution for the origional psu or will I have to get the 1A mark mercer in line psu. Only want to do this as a last resort there is 8 cameras at the minute and more to follow and in would make the installation very messy. I cannot get localised 240v at each camera as electrician on site will not do this.

    I have used these domes before with no problem before but this is the first time I have used these europlex psu.

    Please can any one suggest anything as it would be of great help. THANKS

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