Re: Help on testing/picking an oscilloscope
From: Jim Yanik (jyanik_at_abuse.gov)
Date: 09/25/04
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Date: Sat, 25 Sep 2004 22:50:15 +0000 (UTC)
a?n?g?e?l@lovergirl.lrigrevol.moc.com (The little lost angel) wrote in
news:4155d1fb.182472361@news.singnet.com.sg:
> My friend found for me what appears to be a cheap oscilloscope on sale
> at a used parts place. He took down some details for the Tektronic
> scope's three modules
> 5110 (the 2 chan thingy?)
It's called a Mainframe,needs one vertical and one horizontal plug-in to
work.
> 5A14N (4 Chan amplifier??)
Vertical plug-in
> 5D10 (Waveform Digitizer???)
>
> The 5A14N has four inputs but he couldn't get four traces on the
> screen no matter what. It seems broken since according to him, the
> scope would display two traces from the other module.
First,for the 5A14,you can't use the scope without a B series timebase
plug-in.
I don't recall if the 5D10 has it's own timebase to provide horizontal
deflection.
>
> The working bit with two channels seem to be ok. I think he missed out
> the part number for this, but it's the most recognizable piece to me
> from his description of what clearly are the two analog voltage
> setting dials
>
> But without any sort of input, Chan 2 appears to be faulty as there
> are signals around half the screen in amptitude when he turned it to
> the smallest voltage level 1mv, viewing at 100usec.
>
> The last piece is the triggering piece 5D10 I think (my friend forgot
> to note down the position of the modules)
>
> So our problem is how do we tell if the scope is working sufficiently
> to be worth the $100 the shop is asking for? We don't have any
> sophisticated instrument to test with and the scope doesn't come with
> any leads/probes. Are there some ways to conduct a quick on the spot
> test with some very basic items?
>
> Is it even worth considering or way too old to spend any money on? I'd
> like to have 10Mhz to 20Mhz, this is only 2Mhz according to the web
> but for the price, neither of us have found anything close to it yet.
>
> thanks!!!
>
I don;t consider the 5000 series TEK scopes to be of much use.
The 5110 is only a 2 Mhz bandwidth mainframe.I also believe you are not
experienced enough to evaluate or repair this used scope system,thus it
would not be a wise buy.
Better scopes would be a 400 series scope such as a 465/475,a 2200 scope
such as a 2213/15/35,or a 7000 series scope such as a 7603,7704A,7904/A
with 7A26 and 7B plug-ins.They may cost a little bit more than $100,though.
I worked for TEK for 21 years as a field service technician repairing and
calibrating TEK test equipment such as these scopes.
-- Jim Yanik jyanik-at-kua.net
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