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Re: Voltage from a CCTV camera



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Thanks guys,

I'd had a couple of cameras fail about after the same time in service (same
make & model & purchase date) and was just curious what I was
"getting
back" from their replacements, and the others.

Measurement was with just a basic multimeter, so maybe my readings aren't
worth much.

Cheers,
Tim.



On 23 November 2017 at 23:20, 'Dave McLaughlin' dave@xxxxxxx
[ukha_d] <ukha_d@xxxxxxx> wrote:

>
>
> Measuring with what? Multimeter?
>
>
>
> A scope is the only way to measure the voltage with any accuracy as
the
> waveform will confuse the meter.
>
>
>
>
>
> Dave=E2=80=A6
>
> ---
>
> Very funny Scotty, now beam down my clothes=E2=80=A6
>
> ---
>
>
>
> *From:* ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]
> *Sent:* 24 November 2017 04:00
> *To:* ukha_d@xxxxxxx
> *Subject:* [ukha_d] Voltage from a CCTV camera
>
>
>
>
>
>
>
> I'm wondering what voltage I should expect on the video signal from a
> conventional (i.e. not IP) cctv camera. The cameras all have a 12v
supply
> and the voltages across the pin and ground at the DVR BNC end range
aroun=
d
> 1.18, 1.5, 1.7, 1.2 and 2.12v.
>
> I thought video was +/-1v either side of 0v.
>
> I find it a little odd that all are between 1v and 2v, except one, at
> 2.12v.
>
>
>
> Is 2.12v likely to be an issue?
>
>
>
> Thanks,
> Tim.
>
> __._,_.__
>
>
> <https://www.avast.com/sig-email?utm_medium=3Demail&utm_source=3Dlink&utm=
_campaign=3Dsig-email&utm_content=3Demailclient> Virus-free.
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_campaign=3Dsig-email&utm_content=3Demailclient>
> <#m_7450383145134052938_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
>
>=20
>

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<div dir=3D"ltr">Thanks
guys,<div><br></div><div>I&#39;d had a couple
of ca=
meras fail about after the same time in service (same make &amp; model
&amp=
; purchase date) and was just curious what I was &quot;getting
back&quot; f=
rom their replacements, and the
others.</div><div><br></div><div>Measuremen=
t was with just a basic multimeter, so maybe my readings aren&#39;t
worth m=
uch.</div><div><br></div><div>Cheers,</div><div>Tim.</div><div><br></div><d=
iv><br></div></div><div
class=3D"gmail_extra"><br><div
class=3D"gmail_quote=
">On 23 November 2017 at 23:20, &#39;Dave McLaughlin&#39;
<a href=3D"mailto=
:dave@xxxxxxx">dave@xxxxxxx</a> [ukha_d] <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:ukha_d@xxxxxxx";
target=3D"_blan=
k">ukha_d@xxxxxxx</a>&gt;</span>
wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc
solid;padding-lef=
t:1ex">






=20=20=20=20=20=20=20=20
<div bgcolor=3D"white" lang=3D"EN-GB"
link=3D"blue" vlink=3D"purple">




<br><br>




<div class=3D"m_7450383145134052938WordSection1"><p
class=3D"MsoNormal"><sp=
an
style=3D"font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Me=
asuring with what?
Multimeter?<u></u><u></u></span></p><p
class=3D"MsoNorma=
l"><span
style=3D"font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-ser=
if"><u></u>=C2=A0<u></u></span></p><p
class=3D"MsoNormal"><span style=3D"fo=
nt-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">A
scope is the o=
nly way to measure the voltage with any accuracy as the waveform will
confu=
se the
meter.<u></u><u></u></span></p><p
class=3D"MsoNormal"><span style=3D=
"font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"><u></u>=C2=A0=
<u></u></span></p><p
class=3D"MsoNormal"><span
style=3D"font-size:10.0pt;fo=
nt-family:&quot;Verdana&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p><p=
class=3D"MsoNormal"><span
style=3D"font-size:10.0pt;font-family:&quot;Verd=
ana&quot;,sans-serif">Dave=E2=80=A6<u></u><u></u></span></p><div><p
class=
=3D"MsoNormal"><span
lang=3D"EN-US">---<u></u><u></u></span></p><p
class=3D=
"MsoNormal"><span lang=3D"EN-US">Very funny
Scotty, now beam down my clothe=
s=E2=80=A6<u></u><u></u></span></p><p
class=3D"MsoNormal"><span lang=3D"EN-=
US">---<u></u><u></u></span></p></div><p
class=3D"MsoNormal"><span style=3D=
"font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"><u></u>=C2=A0=
<u></u></span></p><div><div
style=3D"border:none;border-top:solid #e1e1e1 1=
.0pt;padding:3.0pt 0cm 0cm 0cm"><p
class=3D"MsoNormal"><b><span lang=3D"EN-=
US">From:</span></b><span
lang=3D"EN-US"> <a href=3D"mailto:ukha_d@yahoogro=
ups.com" target=3D"_blank">ukha_d@xxxxxxx</a>
[mailto:<a href=3D"ma=
ilto:ukha_d@xxxxxxx"
target=3D"_blank">ukha_d@xxxxxxx</a><w=
br>] <br><b>Sent:</b> 24 November 2017
04:00<br><b>To:</b> <a href=3D"mailt=
o:ukha_d@xxxxxxx"
target=3D"_blank">ukha_d@xxxxxxx</a><br><=
b>Subject:</b> [ukha_d] Voltage from a CCTV
camera<u></u><u></u></span></p>=
</div></div><p
class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p
class=3D"MsoN=
ormal">=C2=A0
<u></u><u></u></p><div
id=3D"m_7450383145134052938ygrp-mlmsg"=
><div
id=3D"m_7450383145134052938ygrp-msg"><div><div
class=3D"h5"><div id=
=3D"m_7450383145134052938ygrp-text"><div><p
class=3D"MsoNormal"><u></u>=C2=
=A0<u></u></p><div><p
class=3D"MsoNormal">I&#39;m wondering what voltage I =
should expect on the video signal from a conventional (i.e. not IP) cctv
ca=
mera. The cameras all have a 12v supply and the voltages across the pin
and=
ground at the DVR BNC end range around 1.18, 1.5, 1.7, 1.2 and
2.12v.<u></=
u><u></u></p></div><div><p
class=3D"MsoNormal">I thought video was +/-1v ei=
ther side of
0v.<u></u><u></u></p></div><div><p
class=3D"MsoNormal">I find =
it a little odd that all are between 1v and 2v, except one, at
2.12v.=C2=A0=
<u></u><u></u></p></div><div><p
class=3D"MsoNormal"><u></u>=C2=A0<u></u></p=
></div><div><p class=3D"MsoNormal">Is 2.12v
likely to be an issue?<u></u><u=
></u></p></div><div><p
class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><d=
iv><p
class=3D"MsoNormal">Thanks,<br>Tim.<u></u><u></u></p></div></div></di=
v></div></div><div><p
class=3D"MsoNormal"><span
style=3D"color:white">__._,=
_.__<u></u><u></u></span></p></div></div></div></div><div
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