6 May
2001
6 May
'01
4:51 a.m.
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(a)calico.litterbox.com>
To: "classiccmp" <classiccmp(a)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(a)DIESPAMMERSCUMcalico.litterbox.com
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