Tuesday, 13 November 2012

Re: [Amateur-repairs] An accurate test meter

 

Probably the simplest and perhaps the best method would be to resonate the unknown with a variable capacitor, using an RF generator and oscilloscope.  Then measure the capacitance.  That way you are using the correct frequency.

I have done this many times and the results are as accurate as the care you take in making the setup and measurement.

On the other hand, if you have many inductors to measure, it might be cumbersome.  I use a GR bridge that works well but it doesn't measure at RF.  I have several RF generators, some nice oscilloscopes, and a box of variable capacitors.

Bob

--- On Tue, 11/13/12, pauldebono@rocketmail.com <pawlud@gmail.com> wrote:

From: pauldebono@rocketmail.com <pawlud@gmail.com>
Subject: [Amateur-repairs] An accurate test meter
To: Amateur-repairs@yahoogroups.com
Date: Tuesday, November 13, 2012, 3:52 AM

 

I am searching for a good L meter, that can measure low to very low RF inductances. The various kits and models around based on a PIC and the LM311, are not good enough. So are these commercial multimeter types.

I came across the M3 or M-Cubed LCZR meter, which Monty, N5ESE, has reviewed and compared with the top, industry standard, the Philips PM6303 LCR Meter (now made by Fluke). Unfortunately , this meter kit is no longer in production. See: http://www.n5ese.com/M3LCR_meter.htm

However, a Metacrawler search, came up with an updated version of this meter:

(It is in French, but their sales department have an English version of the manual.)

http://www.mwinstruments.com/MW1008/MW1008_f.html

Paul

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