From: "Terrell W. Fritz"
Date: Tue, 09 Jan 2001 20:03:02 -0700
Subject: Re: [TSSP] Top voltage testing
Hi Paul, For the bare coil: At Fo (88.054kHz this night) the input current is 1.951mARMS. The input voltage drops to 0.7071 - 0.0019 = 0.7052VRMS with the 1 ohm resistor in series. So I guess the input Z is 361.46 ohms. The F3 overtone is at 319.226kHz and the input current there is 0.459mARMS. However, that frequency is out of the meter's specified range of 200kHz so the current reading is not garenteed but I "think" it is good since the meter seems to be able to go to 1MHz before substatial errors show up. I think out of range means the accuracy is only 0.1% instead of 0.001% ;-)) I could not find f5 but at 3.37MHz there was a healthy resonance but that may be probe related and have nothing to do with the coil. I also have E-Tesla modified with your model numbers but still need to run tests on it... Cheers, Terry At 03:52 PM 1/8/2001 +0000, you wrote: >Terry, > >I've altered the model to include an estimate of the area of your >partial foil ground plane. The predicted f1 is now 87.92 kHz which >agrees with measurement, and the Q has been set to 111.2 by fiddling >with the E field loss factor. > >As a cross check, could you see that the 3/4 wave overtone is >at 309.3 kHz +/- 5%. The reason for always asking for f3 and maybe >f5 in addition to f1 is to allow us to check that the model is >achieving the correct ratio of influence of internal and >external capacitance. Without this check we could 'accidentaly' >get the right f1. If the proportion of internal C is not correct, >then the current profile will be wrong too, thus Lfac and >transimpedance will also be out, and voltage gain predictions >will be broken too. > >If f3 matches then that takes care of the model of the toroided >un-probed coil, and meanwhile I'll get on with simulating the >probe capacitances. > >FYI, > >For the equivalent reactances at f1 I get: > >Lee=70.32 mH; Les=72.61 mH; Ldc=75.10 mH; >Cee=43.71 pF; Ces=45.20 pF; Cdc=75.60 pF; > >Cheers, >-- >Paul Nicholson, >Manchester, UK. >--
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.