[ARC5] Scope Question

[K5MYJ]

When I buy old scopes  won't buy one that does not show a trace. Replacing 
the HV(CRT) power supply can be difficult and expensive.

I've been warned that the Tek 22XX and 24XX scopes can be difficult to 
repair.

I also find early HP digital test equipment can be a CRAP SHOOT! And I do 
understand why, The earlier analog stuff is usually not a big problem.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "Michael Hanz" <aaf-radio-1 at aafradio.org>
Cc: <Arc5 at mailman.qth.net>
Sent: Tuesday, March 20, 2018 9:59 AM
Subject: Re: [ARC5] Scope Question


On 20 Mar 2018 at 12:16, Michael Hanz wrote:

> I've seen that procedural step sometimes used on the later solid state
> scopes to reduce the chances that you will start a measurement with the
> sensitivity switch set at, for example, .01v/CM, when you are about to
> measure say 800v p-p. Transistors don't like that. It's a last "do you
> really want to do this?" check before you make the measurement.

Yes. That makes complete sense, but then why didn't the manual follow that 
with advice to
1) set the vertical sensistivity to "such and such", then
2) set the input to AC or DC to take the measurement.

> The
> older tube input scopes are pretty immune to such errors.

Yes.

> Or, it may be a manual error, as you suggest.:-)

Yes. Well, I am also working on a couple of Tek scopes, a 2465B and a 2467B 
(which had
been left out in the rain for at least a year before I got it), and I am 
finding periodic small
errors in the documentation.

BTW, the 2467B works just fine after I let it dry out for a month or two. 
The 2465B doesn't
"work" at all, but it appears that the trace-blanking is locked on 
permanently.

Ken W7EKB

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