On Wednesday, December 14, 2011 11:07:44 AM Peter C. Wallace did opine:
> On Wed, 14 Dec 2011, gene heskett wrote:
> > Date: Wed, 14 Dec 2011 09:42:24 -0500
> > From: gene heskett <ghesk...@wdtv.com>
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > <emc-users@lists.sourceforge.net>
> >
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users] Scopes
> >
> > On Wednesday, December 14, 2011 09:02:43 AM Mark Wendt did opine:
> >> A bit off tangent, but Jon's post in the Encoder thread brought
> >> something to mind. I recently became the proud papa of a Tektronix
> >> 7623A O'scope, purchased off the Bay of E. It's a mainframe storage
> >> scope, capable of handling three plugins - two vertical amps and a
> >> horizontal timebase. I got that machine, a few different plugins, a
> >> number of probes, and some other odds and ends for less than $500.
> >> It's an analog scope, but in it's time, it was one of the high-end
> >> scopes that Tek made, and it's still going strong even at close to
> >> 30 years of age.
> >>
> >> This one is identical to the one I have:
> >>
> >> <www.ebay.com/itm/Tektronix-7623-Oscilloscope-Modules-and-Manuals-/23
> >> 055 2776690>
> >>
> >> You can get better prices by waiting a bit. I got mine for $100 plus
> >> shipping.
> >>
> >> A venerable high quality machine that you can use to help
> >> troubleshoot problems like the ones that showed up in the Encoder
> >> thread.
> >>
> >> Mark
> >
> > Mark, be aware, very aware that tek has one HUGE Achilles heel. Its
> > input attenuators are all custom, in house made parts. And they age
> > out of calibration, both for DC measurements and for waveform
> > fidelity on the screen, with square waves no longer being shown as
> > square waves, and no amount of fiddling with the probe comp screws
> > can fix it. This starts to get noticeable at about the same time tek
> > takes advantage of the statutes re service parts and discontinues the
> > parts 5 years after production ceases, or decides if they still have
> > one, that it is worth 20x what it was worth a year before when it was
> > still subject to the federal parts availability statutes. Been
> > there, done that, threw it in the ditch when it was 7 years old in
> > one case, 8 in another, because I could not believe what it was
> > telling me.
> >
> > My now 25 year old Hitachi V-1065 (computerized, dual trace 100 mhz,
> > triggered & delayed sweep, good to at least 200mhz with some rolloff &
> > loss of headroom in the vertical amps) is still within a couple
> > percent for any measurement its simple computer can make including
> > frequencies by reciprocal of time. And the tube is as bright and
> > sharp as it was when new as of last night when I measured the baud
> > rate on a serial data line I thought was off. And yes, a midi port
> > was running at about 37,000 baud. The keyboard obviously ignored the
> > data. :(
> >
> > I have worn out at least 8 sets of 10x probes in its time. The 200mhz
> > models I can get from MPJones are as accurate at $40 a copy as
> > anything else I've ever bought, and mechanically sturdier than Tek's
> > $200/copy versions.
> >
> > Sadly, the Tektronix that earned our trust as the final word back in
> > the early 60's, and had lifetime warranties on any in-house built
> > parts including their CRT's & power transformers, has been sold to
> > the stock market 25+ years back, and is no longer worthy of our trust
> > as a standard test gear item unless its still in warranty AND they
> > will fix it. Note the caps, voice of experience. Whether they will
> > honor the warranty is 100% up to the rep that sold it and there
> > effectively is no warranty on anything you didn't buy new from him.
> > If you buy it new from Rudy, but move to Jeffs territory, Rudy won't
> > service it since its out of his area now, and Jeff won't service it
> > because he didn't sell it. Obviously, its been 15 years since I have
> > considered the purchase of anything from Tektronix.
> >
> > Cheers, Gene
> >
> > ----------------------------------------------------------------------
> > -------- Cloud Computing - Latest Buzzword or a Glimpse of the Future?
> > This paper surveys cloud computing today: What are the benefits? Why
> > are businesses embracing it? What are its payoffs and pitfalls?
> > http://www.accelacomm.com/jaw/sdnl/114/51425149/
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> > Emc-users@lists.sourceforge.net
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>
> The 7623 is a 7000 series plug-in type scope >35 years old
> vertical plugins (and the attenuators, which are socketed)
> are a dime a dozen...
>
>
That's great news Peter, but what does a fully stuffed 7623 weigh? My
Hitachi, which of course is not a storage type, weighs maybe 10 pounds,
goes anywhere. Probes won't reach? Stick an upside down 5 gallon paint
bucket under it. :)
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
> ------------------------------------------------------------------------
> ------ Cloud Computing - Latest Buzzword or a Glimpse of the Future?
> This paper surveys cloud computing today: What are the benefits?
> Why are businesses embracing it? What are its payoffs and pitfalls?
> http://www.accelacomm.com/jaw/sdnl/114/51425149/
> _______________________________________________
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: <http://coyoteden.dyndns-free.com:85/gene>
I KAISER ROLL?! What good is a Kaiser Roll without a little COLE SLAW
on the SIDE?
------------------------------------------------------------------------------
Cloud Computing - Latest Buzzword or a Glimpse of the Future?
This paper surveys cloud computing today: What are the benefits?
Why are businesses embracing it? What are its payoffs and pitfalls?
http://www.accelacomm.com/jaw/sdnl/114/51425149/
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