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.