Date:         Tue, 28 Jan 2003 22:32:13 -0500
Reply-To:     David Brodbeck <gull@CYBERSPACE.ORG>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Brodbeck <gull@CYBERSPACE.ORG>
Subject:      Re: NVC:  measuring impedance of a speaker?
Comments: To: Ben McCafferty <ben@VOLKSCAFE.COM>
In-Reply-To:  <BA5C701E.E2C9%ben@volkscafe.com>
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Tue, 28 Jan 2003, Ben McCafferty wrote:

> I have a fairly sophisticated digital multimeter, but it only goes down to
> 200 ohms for resistance.

Really?  Or is the lowest range just 0-200 ohms?  I'd be surprised if it
couldn't measure lower resistances.  Have you tried it?  When measuring
low resistances, it's a good idea to short the probes together and note
the reading, first.  I've seen cheap test lead sets that had over 2 ohms
of resistance all by themselves.

If it can't measure that low, I suggest buying a 270 ohm resistor,
measuring it first, then putting it in series with a speaker and using
subtraction. ;)

(Then go buy a different DMM, because one that can't measure low
resistances will be somewhat limited when it comes to automotive
troubleshooting.)


             _ _
  __ _ _   _| | |  | David M. Brodbeck (N8SRE)              Ypsilanti, MI
 / _` | | | | | |  +-----------------------------------------------------
| (_| | |_| | | | @ cyberspace.org
 \__, |\__,_|_|_| "To the optimist, the glass is half full.  To the
 |___/             pessimist, the glass is half empty.  To the engineer,
                   the glass is twice as big as it needs to be."