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From: John Woodgate
Subject: Re: Temperature Probe Interface / Coax cable Issues
Date: Mon, 20 Jan 2003 20:47:05 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 20 Jan 2003 21:05:42 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Kevin Walton
wrote (in ) about
'Temperature Probe Interface / Coax cable Issues', on Mon, 20 Jan 2003:
>Summary - is this just impedence matching problems from using the
No: cable impedance is significant for **radio-frequency** signals, not
your signals. It sounds as if the thicker coax is not properly connected
at one end (unless it is damaged somewhere along its length).
Disturbance of the readings while you are *moving* the cable is not
unexpected. This is due to small electrostatic voltages developed by
friction between the conductors and the insulation.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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