View Single Post
  #3   Report Post  
Posted to alt.binaries.schematics.electronic
John Larkin[_3_] John Larkin[_3_] is offline
external usenet poster
 
Posts: 231
Default AADE inductance measurement not trustworthy

On Thu, 14 May 2015 02:23:23 -0700, Robert Baer
wrote:

Another degaussing coil, this one from a large TV.
21 inch diameter, kinks minimized.
AADE measures 9.11mH.
One of those "universal" kits that measures almost anything reads
16.8 ohms, 2.55mH.
Using a 0.1uF cap in parallel and driving that with square wave and
10K in series, rings at 9.5KC for 2.8mH


There's probably a lot of distributed capacitance in that coil. Can
you measure the coil SRF?

The AADE is an oscillator that runs at a fairly high but variable
frequency. It's great for small Ls and Cs, not so good for bigger
stuff.


--

John Larkin Highland Technology, Inc
picosecond timing laser drivers and controllers

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com