[TCML] NST Measurements
jeremy_runescape at hotmail.com
Sun Jan 18 23:20:46 MST 2009
urgh the equipment i have is kind of ridiculous =s, i have a 500VAC voltmeter and a couple of 2kA ammeters, all salvaged from a mains power switch board. only the voltmeter is useful i guess. measuring the output amperage is looking to be a pain. will a normal ammeter do the job or will the hV fry it's circuitry? I'm not really looking forward to buying new components as they cost a bomb and i've already spent quite abit on my 15.4kJ cap bank and magnet wire =( needless to say i'll still have to spend another hundred or so buying axial polypropylene caps for my MMC cos all the caps i have atm are aluminium electrolytic.
> Date: Sun, 18 Jan 2009 14:37:26 -0800> From: bartb at classictesla.com> To: tesla at pupman.com> Subject: Re: [TCML] NST Measurements> CC: > > Hi Jeremy,> > How you perform a measurement depends largely on the equipment you have> on hand and what it is you want to identify. So my first question is> what meters do you have hand to make measurements? Obviously, a HVac> probe would be ideal, but not absolutely necessary to simply identify> rough specs. If you have say only a digital rms meter handy, hook up> 120Vac to the output side and measure voltage on the primary. This will> do fine for identifying your turns ratio (Vout/Vin). Then you can just> figure wall plug AC volts x turns ratio for the output. Current more> complicated.> > If you want to look at "more" and get to know the transformer for what> it really is, two meters are helpful. One to read current and the other> to read voltage along with a HV probe. I'm not a big fan of reverse> wiring the transformer to gain transformer characteristics other than> the basic turns ratio. When normal current is flowing, it will be> different from the reverse wired situation because the secondary voltage> applied is never the output volts (but some far lower voltage). If you> could, a hv probe would be needed. But at that point, you may as well> feed low voltage high current to the primary for ease of measurements.> > So again, what equipment do you have on hand?> > Bart> > Jeremy wrote:> > Ok, wait, so how exactly do you guys propose measuring NST outputs for dummies? i have 9kV 30mA unit as well as a large unlabelled unit atm, and the unlabelled one arcs at over half an inch so i'm guessing it's at least 15kV 60mA. I need the measurement on the unlabelled unit. I was thinking of using a 10V input to the NST, then further stepping down the output by 20x to be measured by a voltmeter. Is this workable? (all components rated at 240V input)> >> > > _______________________________________________> Tesla mailing list> Tesla at www.pupman.com> http://www.pupman.com/mailman/listinfo/tesla
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