o-scope

From: Richard Erlacher <edick_at_idcomm.com>
Date: Sun May 6 11:51:49 2001

One of my friends discarded a TEK 535, cart, and about 15 plug-ins last week
when he closed his 40-year-old shop. I didn't have room, and he didn't either.
<sigh> The local surplus dealer didn't want it either, even as a gift.

That 13pf is the capacitance, and the inputs present 1 Megohm impedance, IIRC.
You can tell the model number from the printing on the front of the
oscilloscope, unless it's worn off.

Dick

----- Original Message -----
From: "Jim Strickland" <jim_at_calico.litterbox.com>
To: "classiccmp" <classiccmp_at_classiccmp.org>
Sent: Saturday, May 05, 2001 10:44 PM
Subject: o-scope


> It's not a computer, but it's surely over 10 years old...
>
> I got a scope today, a Tektronix either a 535a or 545a according to the
> operator's handbook in the little hidey hole in the top of the case. (which
> I'll gladly scan if anyone wants a copy).
>
> So I'm a 'scope newbie, does the probe impedance (13 pf) have to match the
> rating on the jack on the scope (47 pf) for the waves coming out of the
> calibration jack to be properly square? And if so, does anyone have a source
> for probes that work with ancient scopes like this?
>
> Also, how do I tell a 535a from a 545a?
>
> Other than the waveform distortion (at worst the square waves wind up looking
> like shark teeth, and at best they're a bit sloped on the leading and top
> edges) the scope seems to work fine as far as I can tell.
>
> Also, can anyone recommend a good book on scope use for newbies?
> --
> Jim Strickland
> jim_at_DIESPAMMERSCUMcalico.litterbox.com
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Received on Sun May 06 2001 - 11:51:49 BST