Re: What's a waveform monitor?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Finn Hammer by way of Terry Fritz <twftesla-at-qwest-dot-net>" <f-h-at-c.dk>

Gang.

I don`t know if it is interesting to have a FFT of the Tesla coils
output, but fyi:

For the tek TDS210 that I bought resently, I have a TDS2MM feasuring
module in order, used.

If it works, and since we already know that a scope picks up all
relevant waweforms well, I`l be happy to supply FFT`s of these
waweforms. That is if I can figure out how to operate the thing. We will
be limited to 60MHz.

Cheers, Finn Hammer

Tesla list skriver:
 >
 > Original poster: "Scott Hanson by way of Terry Fritz 
<twftesla-at-qwest-dot-net>" <huil888-at-surfside-dot-net>
 >
 > Marc -
 >
 > What you saw was a spectrum analyzer, not a waveform monitor. A spectrum
 > analyzer displays the frequency and relative amplitude of a specific "slice"
 > of the radio frequency spectrum. Just connect a short antenna to the input,
 > and you will see dozens of "peaks" from cell-phone bands, garage-door
 > openers, portable phones, aircraft radios, etc, etc. I have monitored the
 > output of a small Tesla coil using a spectrum analyzer, and the result was
 > that there was so much RF noise spread from a few kHz to over 2 GHz that I
 > really couldn't "see" much of interest. Unfortunately, the Tesla coil and
 > the spectrum analyzer were powered from the same AC branch circuit, so much
 > of the noise may have been conducted into the analyzer via the AC line. I'd
 > like to try the experiment again using a battery-powered analyzer. Bear in
 > mind that even on the surplus market spectrum analyzers are much more
 > expensive than oscilloscopes.
 >
 > Regards,
 > Scott Hanson
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Saturday, November 30, 2002 3:07 PM
 > Subject: Re: What's a waveform monitor?
 >
 >  > Original poster: "marc metlicka by way of Terry Fritz
 > <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>
 >  >
 >  >
 >  >
 >  > Tesla list wrote:
 >  >  >
 >  >  > Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
 >  > <jimlux-at-earthlink-dot-net>
 >  >  >
 >  >  > Waveform monitors don't do transforms.. They're basically 
oscilloscopes
 > with
 >  >  > very limited horizontal settings (i.e. 15.75kHz) and funky 
calibrations
 > on
 >  >  > the graticule.
 >  >  >
 >  >
 >  >   The true waveform display that i was privy to see, actually showed a
 >  > sweep of the peaks generated by each frequency being generated by the
 >  > tc.
 >  > with a standard scope you can see peak intensity of the spikes as a
 >  > slice, but how do you know at which frequency these are at?
 >  > I admit this is out of my expertise, but the difference astounded me
 >  > between the two.
 >  >
 >  > Also the waveform unit i saw in use would calculate a 3d furrier
 >  > transform giving a 6x8 plane with these frequencies shown at the
 >  > position of there magnitude, I was impressed.
 >  > Marc M.
 >  >
 >  >