[TCML] Secondary and Primary Assistance

[Jeff Larson]

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 at hp.com> 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 at pupman.com [mailto:tesla-bounces at pupman.com] 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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>>
>>     
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