RE: Another Q about scopes and TCs

Believe it or not, the 500M resistors are about the size of 1/4 watt
resistors.  I am not sure if that is good, but one thing that I should
mention is that the analog meter that I tested the voltage with was kind of
humming when I tested.  Even the test probe wires kind of buzzed.  I thought
I might add that note in.


> -----Original Message-----
> From: Tesla List [mailto:tesla-at-pupman-dot-com]
> Sent: Thursday, June 24, 1999 7:22 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Another Q about scopes and TCs
> Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
> Hi Andy,
> 	The resistors have to be able to withstand the voltage
> across each one
> easily.  I suspect your 500M resistors are pretty big and can
> take a lot of
> voltage.  Next, there may be capacitance across the resistors that may
> transmit high current to the scope if there were high frequency
> transients.
>  Also, if the secondary voltage were to hit the primary, the resistors
> could be easily arced over.
> 	In general, I would say that this "could" be reasonably
> safe but there is
> always some risk to the scope that you have to be willing to accept.
> 	You may want to check out the following web page for a very
> safe field
> antenna design which may serve your needs.  This is what I use
> for most work...
> www.peakpeak-dot-com/~terryf/tesla/experiments/planant/waveant3.html
> Cheers,
> 	Terry
> At 12:42 PM 6/24/99 -0400, you wrote:
> >	To try to aid me in tuning my TC I thought that it would be
> useful to be
> >able to look at the waveform in an oscilloscope.  I have successfully
> >brought the voltage down from 12kv to about 200v using about 5 500M ohm
> >resistors in series, and I suspect I could bring it down even
> more if I need
> >to (I have about 100 resistors).  Would it be smart to connect that to my
> >scope?  Does it do anything that might harm it, or is the High
> Voltage still
> >in there somehow?  I just don't want to injure my silly scope,
> so I thought
> >that I would get some advice.  Thank you,
> >
> >-Andy
> >