From: "Terrell W. Fritz"
Date: Thu, 15 Feb 2001 21:02:09 -0700
Subject: Re: [TSSP] Top voltage testing
Hi Paul, I tried increasing the amplitude of the drive signal... f1 = 311.8 Vtop/Iin = Zft 8.63/0.2216 = 38944 25.5/0.7171 = 35560 50.6/1.4282 = 35429 With full calibration of the levels... Zft = 49.261/1.4388 = 34238 I think 34238 is right for Zft. For some reason, at low signal levels, the readings are higher but as the level is increased the readings stabilize to a more consistent value. Perhaps the ferrite transformer or the metering need more signal to read accurately... Of course 34238 is much closer to your predicted 34903 :-)) I am now getting 1.9% low. However, when I removed the top cap before I replaced the steal hardware with smaller brass which affected the above. So I added back the two steel washers and tried again: f1 = 310.9 Vtop (corrected) = 49.261 Iin ( mA corrected) = 1.4230 Zft = 34450 That is 1.3% low... So with a little fiddling the modeled results seem to be correct after all and the error was just in taking these tricky measurements. Cheers, Terry
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.