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Reply-To: "George Gonzalez"
From: "George Gonzalez"
References: <email@example.com> <firstname.lastname@example.org>
Subject: Re: Picking oscilloscopes on Ebay?
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
NNTP-Posting-Date: Mon, 23 Sep 2002 21:58:50 GMT
Organization: AT&T Broadband
Date: Mon, 23 Sep 2002 21:58:50 GMT
I've bought and sold scads of scopes on eBay. A few observations:
* Most scopes sold are not in "top" condition. Almost all of them
need cleaning, balancing, calibration, and contact cleaning. Even those
that look clean can be quite dirty inside. Even those that "light up"
tend to be unusable if the controls are scratchy and intermittent.
* Any scope over 10 years old is likely to need some new
electrolytic and/or tantalum capacitors. Even the best scopes
used kinda marginal 85C electrolytics. A good third of scopes
I've bought on eBay needed at least one new power supply
* If you do buy a used scope, leave it ON full-time for the first week.
A goodly proportion of weak capacitors fail after a few days of
power and heat. This at least gives you a bit more leverage with the
seller if it fails just days after delivery.
* Check out the scope for shipping damage-- It's common for front-panel
knobs to get pushed in and damaged. Some of the more
fragile CRT's with expansion-meshes can go way out of
geometric alignment if they get mildly dropped in transit.
Move the sweep trace up and down all the way, watching out
for any bends or wiggles in the line. Any funny wiggles or
flashy stuff that you can't abide means you need a new CRT, many $$.
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