From: Paul
Date: Sun, 24 Mar 2002 13:43:22 +0000
Subject: Re: Ready :-)) - Re: [TSSP] short H/D and stuff
Hi Terry,
I modeled the test coil...
Comparison of measurements (3-23/raw.CSV) with model (tfcp1.in):
Meas Model Error
Rdc 32.65 ohms 32.91 +0.8% (@25 degC), less 0.4% per degC
Ldc 39.0 mH 39.2 +0.5%
f1/4 229.931 kHz 231.6 kHz +0.7%
Q1/4 463.3 363.7 -21%
f3/4 578.079 kHz 583.9 kHz +1.0%
Q3/4 183.9 449.3 +144%
f5/4 903.578 kHz 939.5 kHz +4.0%
Q5/4 108.48 412.1 +280%
The model reproduces f1 and f3 without difficulty. f5 is showing
signs of the coil former dielectric, but we can still use it. The
model is not making any corrections for the bucket plastic in the
above figures. I set the coil base height to 12".
The following current profiles should be reliable predictions:
http://www.abelian.demon.co.uk/tssp/tfcp240302/f1-vi.gif
http://www.abelian.demon.co.uk/tssp/tfcp240302/f3-vi.gif
http://www.abelian.demon.co.uk/tssp/tfcp240302/f5-vi.gif
Some specific predictions of the current profile's turning points:
f1/4 Height Current
31% Ibase * 1.38 Maxima
f3/4 Height Current
14% Ibase * 1.94 Maxima
47% Zero Minima
88% Ibase * 2.0 Maxima
f5/4 Height Current
9% Ibase * 2.15 Maxima
28% Zero Minima
49% Ibase * 2.35 Maxima
70% Zero Minima
88% Ibase * 2.15 Maxima
The setup of the coil on the polystyrene base appears to be
perfectly fine for the current profile measurements. I'm quite
happy that the model is working correctly and giving a good
representation of this setup.
I'm also very happy with both the single shot and the avg 16 scope
traces, the trace analysis seems to perform very well on them.
More to follow later...
--
Paul Nicholson,
--
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.