TSSP: List Archives

From: mystuffs@orwell.net (Metlicka Marc)
Date: Sun, 07 Jan 2001 16:19:01 -0500
Subject: Re: [TSSP] L measurements



Paul wrote:
> 
> Metlicka Marc wrote:
> >
> > paul,
> > these were all taken with the coils in free space, actually setting
> > on my milk crate but nothing but carpet and floorboards beneath.
> > also i moved everything so that the area surrounding the coils was
> > removed, a good 7' of free space all around. i will say that the walls
> > are of the chicken wire rock lath type. all measurements were made after
> > i checked the inductance's of the leads shorted together and the
> > resistance's of the leads subtracted. my manual actually states to use
> > twisted pair leads for high accuracy in L readings, so i did. all L
> > readings were using the 1 khz internal generator.
> 
> That sounds like a first class measurement. The #3 L calculated on the
> basis of 3001 turns (turns counter) comes out at 386.5 mH, and the
> resistance is 454 ohms, so I wonder if somehow you have fewer turns to
> obtain 355.5 mH and 425.8 ohms.
yes, there was much forward winding and reversing to get overlaps out. i
am in the process of using the digital imaging counting now.
> 
> Seems to me that counting turns along a secondary would be a
> straightforward job for software. Take a line of pixels along
> the coil and convert to the spatial frequency domain, and then look
> for the whopping spike in the spectrum. Somebody ought to write a
> little utility program.
well i just didn't understand any of that, but that's ok.
> 
> BTW, I take it the 'Q' readings accompanying your data apply
> to 1kHz, I hope so!
yes, the Q dial is used with the internal 1 khz generator. 
marc
> Cheers,
> --
> Paul Nicholson,
> Manchester, UK.
> --


Maintainer Paul Nicholson, paul@abelian.demon.co.uk.