Re: [TCML] Secondary and Primary Assistance

[Frank <fxrays@xxxxxxxxxx>]

"Home" meggers are 500 VDC, industrial use ones are typically1KV with 
specialized ones to 5 KV. I have used all 3.

Materials all have different resistances at different frequencies. HV 
DC is not a complete or definitive test for the material.
A typical megger could tell you the material is of a high resistance 
at DC but it could still be a "short" at RF frequencies.

I would suggest you pick up a violet ray, typically Ebay is a good 
source and make a pointed electrode for it, AKA a neon tester, and 
run the tip across the material you wish to use for a TC coil form.
Do this in a darkened room and if you see arcing across the form, you 
will know it is not suitable for a TC. If there is no arcing, touch 
the form with your free hand while the tester is in contact with the 
form. If you can draw an arc or feel the electricity, trust me, you 
can tell, it is like your finger is sticking to the form, then you 
know at TC frequencies, the form is no good.

It has been suggested the lettering is conductive, use this same 
method on the lettering to see if it is a problem.

Give me a few days and I will test a piece and let you all know.

I have a 500V megger and a ton of violet rays around here so it will 
not be hard to do. I just have to pick up a piece of sonotube.

Frank
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