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Help on testing/picking an oscilloscope

Discussion in 'Electronic Basics' started by The little lost angel, Sep 25, 2004.

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  1. 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?)
    5A14N (4 Chan amplifier??)
    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.

    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!!!

    --
    L.Angel: I'm looking for web design work.
    If you need basic to med complexity webpages at affordable rates, email me :)
    Standard HTML, SHTML, MySQL + PHP or ASP, Javascript.
    If you really want, FrontPage & DreamWeaver too.
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  2. Jim Yanik

    Jim Yanik Guest

    a?n?g?e? (The little lost angel) wrote in
    It's called a Mainframe,needs one vertical and one horizontal plug-in to
    work.
    Vertical plug-in
    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.

    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.
     
  3. dh

    dh Guest


    Not worth it. Check eBay. I picked up a 465B (100MHz, probes, bag,
    manual, perfect condition) for $99 plus $25 or so shipping. That would
    be infinitely better than this old dog you're looking at.
     
  4. I know... but the last time I found a suitable scope for a good price
    on ebay... it would had cost about 2x the price to ship it halfway
    across the world to me :(

    --
    L.Angel: I'm looking for web design work.
    If you need basic to med complexity webpages at affordable rates, email me :)
    Standard HTML, SHTML, MySQL + PHP or ASP, Javascript.
    If you really want, FrontPage & DreamWeaver too.
    But keep in mind you pay extra bandwidth for their bloated code
     
  5. Thanks! Though I guess I will just have to keep looking :(

    --
    L.Angel: I'm looking for web design work.
    If you need basic to med complexity webpages at affordable rates, email me :)
    Standard HTML, SHTML, MySQL + PHP or ASP, Javascript.
    If you really want, FrontPage & DreamWeaver too.
    But keep in mind you pay extra bandwidth for their bloated code
     
  6. Jan Pompe

    Jan Pompe Guest

    I bought some books that way and it cost 3 times the price to ship.

    They were heavy though and locally would have cost over $800 new and got
    them for $150.

    It was still a bargain.

    Books are one thing but unless you know how to service these things I
    wouldn't be buying on unless I see it working - properly.
     
  7. Joe

    Joe Guest

    L. Angel,

    I don't know where on planet earth you are, but you may want to watch your
    local newspapers and want ads. In my case, I searched for a scope for about
    6 months, and finally,I found a local cable company liquidating some old
    test equipment. I was able to get my tek 465b for US $150 (IIRC), or maybe
    it was $125. Anyway, none of the scopes had probes or manuals, but I brought
    a little homemade circuit built out of a 555 that would output different
    frequencies with 2 output leads hanging off it to test the scopes they had.
    The 465b also has a calibration connector on the panel to check it .
    The scope still works, that was about a year ago.

    hth,
    Joe
     
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