Re: Oscope advice

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

Original poster: "Chris Arnold by way of Terry Fritz <teslalist-at-qwest-dot-net>" <chris_arnold-at-msn-dot-com>

The leading edge appears to be rounded off severely, which (thanks to Dr. 
Resonance for pointing this out) is most likely caused by poorly adjusted 
compensation on my probe.  Thanks for the replies.

Chris


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Oscope advice
>Date: Wed, 13 Aug 2003 06:18:57 -0600
>
>Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><jimlux-at-earthlink-dot-net>
>
>
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Tuesday, August 12, 2003 9:54 PM
>Subject: Re: Oscope advice
>
>
> > Original poster: "Chris Arnold by way of Terry Fritz
><teslalist-at-qwest-dot-net>" <chris_arnold-at-msn-dot-com>
> >
> > A while back I got a decommissioned Tektronix 7704 A 'scope, and it seems
> > one of the channels is in need of callibration - square waves aren't so
> > much square ;).
>
>
>That's a probe or amplifier compensation thing.. Is there just a tilt in the
>square wave, or slow rise times, or overshoot?
>
>  Where can I dig up information on how to recalibrate
> > it.  One other thing, on the lower horizontal timescale settings - like
> > into the nanosecond ranges the scope seems to become unstable and the
> > display will suddenly become unreadable.  What is causing this?
>
>Is the sweep speed unstable, or is it the triggering?
> >
> > Thanks a bunch,
> >
> > Chris
> >
> >
> > >From: "Tesla list" <tesla-at-pupman-dot-com>
> > >To: tesla-at-pupman-dot-com
> > >Subject: Re: Oscope advice
> > >Date: Mon, 11 Aug 2003 13:18:01 -0600
> > >
> > >Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>"
> > ><jimlux-at-earthlink-dot-net>
> > >
> > >465s are great scopes (as indicated by the remarkably high Ebay prices
>for
> > >a way obsolete (commercially) scope)..
> > >
> > >One gotcha, though... make sure the tube is good and not burned.  I'll
>bet
> > >a replacement CRT for these is quite expensive.  The other thing is to
>not
> > >even bother buying one of these that isn't working, thinking you'll fix
> > >it.  You'll have a tough time finding replacement parts (particularly
> > >transistors and such for the vertical amps).
> > >
> > >However, if it's working, and just needs readjustment, or recalibration,
> > >then, have at it...
> > >
> > >
> > >At 05:29 PM 8/6/2003 -0600, you wrote:
> > >>Original poster: "Peter Lawrence by way of Terry Fritz
> > >><teslalist-at-qwest-dot-net>" <Peter.Lawrence-at-Sun.COM>
> > >>
> > >>Terry,
> > >>       I'm thinking of getting a used Tek 465 scope for tesla coil
> > >>measurements. Do you have any comments on that model, or any related
> > >>advice.
> > >>
> > >>-Pete Lawrence
> > >>
> > >>(ps, feel free to post response to tesla list if you think others will
> > >>be interested).
> > >>================
> > >>Hi Pete,
> > >>
> > >>Tektronix has never made a bad scope ;-))  Avoid those giant ones that
> > >>are bigger than a cow.  Any of the smaller (12x18x8) style CRT scopes
>are
> > >>great.  I have long forgot which is the 465...  I looked on ebay and
> > >>those are great scopes!  They don't have fancy microprocessors ore
> > >>anything but they don't let you down.  Try and get the service manual if
> > >>you can incase you ever have to fiddle with it.  But they made zillions
> > >>of those things so everyone knows how to fix them if they ever were to
>break.
> > >>
> > >>Cheers,
> > >>
> > >>         Terry
> >