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Re: [TCML] Secondary and Primary Assistance

I just picked up one of these.
http://www.megger.com/us/products/ProductDetails.php?ID=800
From Newark it was around 500 dollars.
It will measure up to 200 gig ohm. It does all sort of other measurements too. One version has blue tooth. It has different voltages up to 1000 volts for measuring the higher resistances. It actually goes over 1100 volts. I get funny looks from people when I draw a small arcs between the tips of the "Ohm Meter" . :-) 
I use mine all the time.  It is pretty nice.
I could check a piece of that form material on Monday. I have some of the Home Depot brand concrete tube. It is yellow with black writing. 

Jeff

DC Cox wrote:

A megger is a high voltage (1-5 kV) device that indicates resistance in the
range of 5 to 1,000 megOhms.  Commonly used to check for phase to phase
insulation in large electric motors, Also for checking grounds to an earth
reference.  Standard fare for an industrial electrician which I was in 1961
- 1966 era.

Old fashion units were hand-crank generator type.  New ones are solid state
using IGBTs or MOSFET oscillators to drive a small HV xmfr.

Dr. Resonance

On Sat, Mar 22, 2008 at 1:51 PM, Lau, Gary <Gary.Lau@xxxxxx> wrote:


As Scott suggested, I think the most revealing test would be to hold a
sample of the printed form up to a small sparking Tesla coil topload and see
if the sparks want to surface track on the printed portions more-so than the
unprinted portions.  A real easy test if one has a piece of Sonotube
available; unfortunately I do not.  I don't know at what voltage a Megger
(Meager?) operates, but probably the closer to actual TC voltages, the
better.

Using what I have, I just held a piece of 4" SDR PVC pipe with un-cleaned
printing on it, to the sparks coming from my bug zapper-powered mini coil (
http://www.laushaus.com/tesla/bzt_coil.htm ).  I was unable to see any
effect that the printing had to the sparks.  However, when I drew a line
with a graphite pencil on the PVC, the sparks made a very bright surface
track along that line.  Similar behavior when I sprayed a water mist onto
the PVC, though not as bright as the graphite.

If someone has a piece of Sonotube and a small coil available, please try
that?

Regards, Gary Lau
MA, USA


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of bartb
Sent: Friday, March 21, 2008 9:08 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Secondary and Primary Assistance

Agreed, hence the questions. It's funny when we say something is
conductive. Everything is conductive at some point. It's probably just
another one of those areas of being safe rather than sorry. One would
need to hipot the ink at a distance and do the same for the non-ink area
at the same distance and compare. DC mentioned he used a Meager, so
maybe he did something similar to this.

Take care,
Bart

Lau, Gary wrote:

With PVC forms, I remove the printing with Goof-Off solvent, only

because it's

easy to do and enhances the aesthetics.  I think it's important to

accurately report

what we know as fact and with there is to back that up, vs. what we

assume and

just _seems_ reasonable.

Regards, Gary Lau
MA, USA

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