[ARC5] Low Low Ohmeter

[Bry Carling]

What about "internal resistance of the source?"

Sincerely,

73 - Brian "Bry" Carling, AF4K





________________________________
From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> on behalf of Dennis Monticelli <dennis.monticelli at gmail.com>
Sent: Thursday, January 16, 2020 13:06
To: Robert Eleazer <releazer at earthlink.net>
Cc: ARC-5 Maillist <arc5 at mailman.qth.net>
Subject: Re: [ARC5] Low Low Ohmeter

Just make your own Kelvin four-point ohmmeter.  Pass some serious current (say 1A) through the thing you're measuring and connect a voltmeter inside of the atttached points of entry and exit of the current.  If 1A then each mV equals one milliohm.

Dennis AE6C

On Thu, Jan 16, 2020 at 9:56 AM Robert Eleazer <releazer at earthlink.net<mailto:releazer at earthlink.net>> wrote:
Recently I did some work on my airplane and struggled with measuring some resistances.  For example, a max of 0.1 ohms is Okay for one test while 3 ohms is not.

I recall an article I think was in a ham magazine many years ago about how to build a Low Low Ohmmeter, designed to measure very low resistances.  Any of y'all recall that?

Thanks!

Wayne
WB5WSV
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