Electrical Engineering - Cooaxial cable capacitance calculation

Author

Cooaxial cable capacitance calculation

pfaisalbe@gmail.com

2007-07-24, 8:25 pm

I wish to measure the capacitance of a coaxial cable.Is it a good
approach to use LCR bridge
Please give suggestions

Thanks

Spurious Response

2007-07-24, 8:25 pm

On Tue, 24 Jul 2007 16:20:03 -0700, pfaisalbe@gmail.com wrote:

>I wish to measure the capacitance of a coaxial cable.Is it a good
>approach to use LCR bridge
>Please give suggestions
>
>Thanks

Find out the brand and type of cable it is, go to their web site, get
their spec sheet on the cable, and find the picofarads per foot that it
exhibits.

For actually measuring it, the longer a segment you use as a baseline,
the more accurate your data will be.

In other words, a 20 foot piece will give you more precise information
that trying to read a foot long piece.

Divide by twenty for per foot data for a twenty foot segment.

Do NOT use side cutters to cut it. Use a shear type cutter, or strip
back an inch form the end with a very sharp blade such that you get a
very clean, non-deformed cut on the end(s).

Salmon Egg

2007-07-25, 3:25 am

On 7/24/07 5:33 PM, in article ba6da3tc060dsv30mvis5of11gqtp8ouja@4ax.com,
"Spurious Response" <SpuriousResponse@cleansignal.org> wrote:

> On Tue, 24 Jul 2007 16:20:03 -0700, pfaisalbe@gmail.com wrote:
>
>
>
> Find out the brand and type of cable it is, go to their web site, get
> their spec sheet on the cable, and find the picofarads per foot that it
> exhibits.
>
> For actually measuring it, the longer a segment you use as a baseline,
> the more accurate your data will be.
>
> In other words, a 20 foot piece will give you more precise information
> that trying to read a foot long piece.
>
> Divide by twenty for per foot data for a twenty foot segment.
>
> Do NOT use side cutters to cut it. Use a shear type cutter, or strip
> back an inch form the end with a very sharp blade such that you get a
> very clean, non-deformed cut on the end(s).
Ifyou can find one, use a Q-meter. Select the frequency you wish to use.
Find a coil that will resonate with the stray capacitance with a known
length of the cable in parallel. Remove the cable and measure how much
capacitance you need to add to get back to resonance.

Bill
--
Iraq: About three Virginia Techs a month

TE Chea

2007-07-26, 3:25 am

| Iraq: About three Virginia Techs a month
irrelevant to this thread / NG

Spurious Response

2007-07-26, 3:25 am

On Wed, 25 Jul 2007 23:36:08 +0800, "TE Chea" <4ws@gmail.com> wrote:

>| Iraq: About three Virginia Techs a month
>irrelevant to this thread / NG
>
It was not in his message body, it is part of his sig, idiot.

For someone that jacks off at the mouth about what is or is not on
topic, you sure show everyone just how little you know about Usenet.

http://en.wikipedia.org/wiki/Signature_block

LinkBot