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rab
Guest
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 Posted:
Fri Feb 25, 2005 9:43 pm Post subject:
surface resistance between 2 points |
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Hi,
I have a discussion with a collegue. We have material with 1 M/square
surface resistance. What is the resistance between 2 points (diameter 1 mm
round) seperated by 20 mm. Is there a formula somewere or a place to look.
Thanks
Ronald
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Larry Brasfield
Guest
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| Posted:
Fri Feb 25, 2005 11:35 pm Post subject:
Re: surface resistance between 2 points |
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"rab" <xyzyrbuining@xs4all.nl> wrote in message
news:421f480d$0$28993$e4fe514c@news.xs4all.nl...
| Quote: | I have a discussion with a collegue. We have material with 1 M/square
surface resistance. What is the resistance between 2 points (diameter 1 mm
round) seperated by 20 mm. Is there a formula somewere or a place to look.
|
Look for the formula giving the capacitance
between adjacent round conductors. Except
for the constant term and the fact that one is
per unit length and the other not, the formula
will be the same. Just substitute conductivity
for permeability per unit length.
--
--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
Above views may belong only to me. |
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Jamie
Guest
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| Posted:
Sat Feb 26, 2005 1:28 am Post subject:
Re: surface resistance between 2 points |
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rab wrote:
| Quote: | Hi,
I have a discussion with a collegue. We have material with 1 M/square
surface resistance. What is the resistance between 2 points (diameter 1 mm
round) seperated by 20 mm. Is there a formula somewere or a place to look.
Thanks
Ronald
not sure on your question format "1 M/square" ? |
1 meter per square? or 1 meg ohm per square?
and when you say round?, are we talking about a
round like in a doughnut? or a sphere ?
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John Larkin
Guest
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| Posted:
Sat Feb 26, 2005 6:10 am Post subject:
Re: surface resistance between 2 points |
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On Fri, 25 Feb 2005 16:43:59 +0100, "rab" <xyzyrbuining@xs4all.nl>
wrote:
| Quote: | Hi,
I have a discussion with a collegue. We have material with 1 M/square
surface resistance. What is the resistance between 2 points (diameter 1 mm
round) seperated by 20 mm. Is there a formula somewere or a place to look.
Thanks
Ronald
|
There is an equation. Google "surface resistance two contacts" or
something similar.
(rho/dz)log(L/r)/pi or something.
John |
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