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Re: [TCML] NST Measurements
bartb skrev:
Hi Greg,
Yes, interesting to discuss and "maybe" it won't change anything
significant, but it has already changed some views (including my own).
For example, the TCML in general has been recommending reverse feed
for determining turns ratio for many years. Due to the very obvious
non-linearity shown with measurement, this probably won't be
recommended in the future for shunted transformers. So that is at
least one change that is backed up by measurement. For NST's, your
going to have to go off the faceplate ratings for these numbers for
any accuracy. You can get close with high voltage probe measurements
in a primary feed test (roughly 10% error).
I can't test your thesis either (missing the 500k high watt resistor).
500W is a bit much. More likely about 200W accounting for the drop,
but even this capability wouldn't help much (helpful only at the
specific load). I think a test that is worthy is to capture the output
current during charge from zero to bang with some specific C sizes.
That would tell something regarding load impedance and how the
transformer performs over time.
In the end, when the cap is charged to breakdown at bps, the NST is
equivalent to it's Voc x Isc ratings. Spark lengths as based on power
for NST's and non-shunted transformers (including measured bps values)
are too similar for the NST to be otherwise. If it were a purely
resistive load, then likely a shift. Due to what we see with NST's and
spark lengths, I would say we do know the power it's capable of in the
right circumstance. I think Tesla Coils just naturally provide the
"perfect" circuit for getting the most out of an NST. Strange but true.
Take care,
Bart
Finnish neon sign transformer manufacturer : Neoncomp, publish load
curves for their transformers:
http://www.neoncomp.fi/pdf/prod_REL_rev2.pdf
Bottom page
Cheers, Finn Hammer
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