Re: cctv camera no image

["Doug" <not@xxxxxxxx>]

I believe the 1 Volt peak to peak is for B/W only, colour should be around
1.143 Volts peak to peak

Doug

--

"Roland Moore" <nospam@xxxxxxxxxx> wrote in message
news:4729f3ad$0$24276$4c368faf@xxxxxxxxxxxxxxxxx
> >That is incorrect.  At the BNC connector you will >typically see about
> >1V,
> P/P.
>
> Trying to explain that to the OP not knowing what meter or setting he has
> available is tough, especially since he was told by one poster he would
> not
> see anything. On some color cameras I have seen it as high as 1.4 volts
> peak
> to peak. We use a meter that costs more than half a grand to measure CCTV
> problems. I am sure you've seen one or maybe had one. It allows you to
> focus
> the camera just by looking at the numbers alone without ever having to see
> an image. There are other useful measurements there for finding problems
> with video as well. Maybe you could figure out a way to make money renting
> them to customers doing their own large conventional CCTV installations?
>
> <robertlbass@xxxxxxxxxxx> wrote in message
> news:1193872093.427755.68150@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> On Oct 29, 4:53 pm, resisto...@xxxxxxxxx wrote:
>> > On Oct 29, 2:21 pm, e.dav...@xxxxxxxxxxxx wrote:
>> >
>> > > What could be the cause of a cctv camera suddenly having no image?
>> > > There is still a power LED coming on, but no signal coming through.
>> > > I
>> > > have tested the voltage on the BNC output and it shows 0V.
>> >
>> > Well you should not have any voltage on the BNC connector.
>>
>> That is incorrect.  At the BNC connector you will typically see about
>> 1V, P/P.
>>
>> > You should
>> > have 2 conductors for power. But if the led is on then you have power.
>> > So either the BNC end went bad especially if it is those junk twist on
>> > ones
>>
>> That is also incorrect.  Twist-on connectors have been in use for
>> years without failing.  You have to strip the cable correctly to use
>> them effectively.  Soldered or press-on types are better for high def
>> signals.  However, very few CCTV systems are HD.
>>
>> > or something blew the camera. I have had that happen twice in the
>> > last couple weeks
>>
>> That or a loose connection are the most likely culprits.  If there are
>> other, functioning cameras in the system, swap the bad with a known
>> good one.  First try swapping BNC inputs at the DVR or monitor end.
>> If the problem remains the same the DVR or monitor has a problem.
>> This isn't as likely but it's the easiest thing to check so do that
>> first.
>>
>> If the problem follows the swapped input, restore it and swap the
>> camera with a known good one.  If the problem stays the same it's a
>> bad cable or BNC connector.  If the problem follows the swapped
>> camera, then the camera is at fault.
>>
>> Regards,
>> Robert L Bass
>> www.BassBurglarAlarms.com
>>
>
>