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smt capacitor testing with oscilloscope?

Discussion in 'Electronic Basics' started by [email protected], Feb 25, 2008.

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  1. Guest


    How can I test a smt capacitor in "live" circuit with a oscilloscope?

  2. Jamie

    Jamie Guest

    Its not so much testing the capacitor in a live circuit, you need to
    know how the circuit is suppose to function to even start thinking of
    using an O-scope. For that, you need a service manual or schematic and
    understanding of what you're looking for and at.

    "I'd rather have a bottle in front of me than a frontal lobotomy"

    "Daily Thought:
    You need brains before thought!

  3. Looks like you're out of luck, again!

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  4. Rich Webb

    Rich Webb Guest

    As Jamie notes, testing in an operating circuit requires knowledge of
    what to expect to see if the component is operating normally.

    For in-circuit testing on a de-energized circuit, however, it is
    possible to get some idea of what's "going on" with an o-scope and a
    stimulator circuit. There are commercial versions (see Huntron
    Tracker) but a home-made rig is pretty simple. See a discussion at
    <> and similar.

    Using an octopus isn't magical and is not likely to yield useful
    results unless the effects of the surrounding components can be
    determined. It's most usefully employed when there is a known good
    card against which the suspected failure can be compared.
  5. Guest

    Using an octopus isn't magical and is not likely to yield useful
    How can I determine effects of the surrounding components? I've got a
    analyser PTS model 8001.

  6. Rich Webb

    Rich Webb Guest

    I'm not familiar with that piece of equipment; didn't see anything on
    a quick Google search.

    WRT the surrounding components, if you don't have a schematic then all
    you can reasonably do is trace out what you can and apply brain power.
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