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Re: Found an oscilloscope and was wondering how I could ...
Hi all,
this post makes me wonder - would it be a useful idea
for measuring a coil's breakrate to check the flicker rate in
a fluoro tube using a photo transistor (destructive voltages
aside)? I know there is some persistence in the tube. I might
have a go at this on my coil. A crude scope test suggests the
coil is intermittently operating at 100 and sometimes 200 BPS.
It has a static gap. Any thoughts?
Regards,
Malcolm
On 30 Aug 00, at 8:27, Tesla list wrote:
> Original poster: "Timothy W. Kelogg" <twk5-at-worldnet.att-dot-net>
>
> Hi Garry,
>
> You can set the sensitivity of your o'scope so you won't need to wind an
> antenna.
> I taught how to use Test Equipment to young Sailors and Marines at the
old NAS
> Memphis Schools (about 10 years ago - wow I'm getting old). You can
> measure the 60
> hz "signal" emitted by florescent lights from 6 feet away.
>
> I don't know what frequency T-coils run at but those Heathkit O'scopes were
> used
> for TV repair and experimenting in the "good ol days" (My dad got one when
> I was
> young and I've still got it). Yours is probably a 5 or 10 Mhz Scope. so if
> they
> run at frequencies much higher than that it will be hard to get an accurate
> frequency measurement... but we can try.
>
> There are several basic controls your O'scope will have:
> 2 brightness knobs, one for the trace (the line, or the "dot") which you
> set for a
> comfortable viewing level with the ambient lighting conditions. NOTE -
when not
> taking measurements it is a good idea to turn the brightness of down so as
> not to
> "burn" throught the phosphers on the screen and make a "dead spots".
>
> The other "brightness" will be for the reticle or scale (the grid) a piece
> of "side
> lit" plastic (or glass) that has lines drawn on it - this will be used in the
> frequency measurements. Again adjust this for comfortable viewing level.
>
> I just realized this will take a while to explain how to use an o'scope - I
> just
> checked the web and found someone tryign to explain how to use one to
> someone else.
> http://www.infosite-dot-com/~jkeyzer/handy/1997/Jan-Jun/0650.html
>
> in part he says this: "This is probably still confusing. In the tech school
> I went
> to we spent about a week on how a o'scope works and how to use one. The
> fastest way
> to learn a o'scope is to sit down with someone and have them show you."
>
> If you have AIM or Yahoo IM or IRC, or CheetaChat, or MSN Chat, I can
> probably talk
> you through how to use your scope while you have it in front of you so I
> can get
> some feedback. send me an e-mail off list if you want and we can try to
> get you up
> to speed on this. :)
>
> See if you can find you O'scope here at the Heathkit Museum
> http://www.heathkit-museum-dot-com/hktestnav.html
>
> Here is another website with some o'scope info
> http://www.atcweb-dot-com/audio.htm
>
> Even better is this site:
> http://www.tektronix-dot-com/Measurement/cgi-bin/framed.pl?Document=/Measurement
> /App_Notes/XYZs/terminology.html&FrameSet=oscilloscopes
>
> "This book serves as a useful classroom aid. It
> includes vocabulary and multiple choice written
> exercises on oscilloscope theory and controls. You do
> not need any mathematical or electronics knowledge.
> This book emphasizes teaching you about
> oscilloscopes -- how they work, how to choose the
> right one, and and how to make it work for you."
>
> Another really good place to look is http://www.avionics-dot-com/
> look under Avionics Test Equipment, then O'scopes.
>
> Hope this helps, Again e-mail me and we can try to do this aver the net
if you
> want.
>
> T
>
> Tesla list wrote:
>
> > Original poster: "Garry F." <garryfre-at-pacbell-dot-net>
> >
> > Use it to find the resonant frequency of the secondary and the primary
> circuit.
> >
> > I never used one of these gadgets so I think I shall get some power
supplies
> > and running the input in and work on getting used to reading it. By power
> > supplies, I mean them dinky little things that run about 6 volts.
> >
> > I have a funny, or maybe not so funny feeling that I could wind myself a
> little
> > coil and approach to about ten feet of the coil and get some sort of
> frequency
> > reading with the secondary removed from the unit and get a frequency
> reading on
> > the coil. Or, maybe I could just use an antenna maybe. I made the
entire coil
> > assembly for quick disassembly and re-assembly. The secondary just slips
> inside
> > the top and a spring on the bottom makes contact to ground
> >
> > Anyone have any book reccommendations like Oscilloscopes for the brain
> dead, or
> > Oscilloscopes for the complete dingbat? j/k
> >
> > There is no manual with this thing, or I would just read that.
> >
> > It's a heathkit general purpose, small in size but lots of nice knobs. I
> had a
> > fella check it out and he declared it healthy.
>
>
>