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logic analyzers on ebay

Discussion in 'Electronic Design' started by Dan, Jan 24, 2004.

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  1. Dan

    Dan Guest

    I see a lot of good deals but they seldom come with pods and/or manuals.

    1) Are the connectors for the pods using standard connectors, like dsubmin
    or centronics?
    2) Are the interfaces fairly straight forward?

    The ones I am watching are: HP1650A, HP1630G, Tektronix 1241 & 1230.

    Dan
    dansteely2001 AT yahoo dotcom
     
  2. Avoid any that do not include pods, at least, unless you have a
    viable source for said pods. Manuals can usually be had later.
    While the connectors may be a standard format, think of the pods
    themselves as oscilloscope probes on steroids. I've yet to see ANY L.A.
    pod that did not have electronics in it as part of the design.

    Tektronix is an excellent example. If you crack open a pod for any
    of their analyzers, you will find an intricate work of art with at least
    one custom IC.

    In short: Each manufacturer customizes their pod circuit according
    to their own design. It's far from a simple cable breakout.
    In theory they are. In practice, just the opposite.
    Personal bias: I have a Tek 1241. Like it a lot. The color screen
    makes things sooooooo readable.

    Happy hunting.

    --
    Dr. Anton Squeegee, Director, Dutch Surrealist Plumbing Institute
    (Known to some as Bruce Lane, KC7GR)
    kyrrin a/t bluefeathertech d-o=t c&o&m
    Motorola Radio Programming & Service Available -
    http://www.bluefeathertech.com/rf.html
    "Quando Omni Flunkus Moritati" (Red Green)
     
  3. Richard

    Richard Guest

    What Anton said.

    An analyzer without the pods is less than worthless. Don't buy.
    Piecing your own kit together will cost more than buying a complete
    unit. And building pods isn't viable.

    You'll find the clips are often missing. You can make your own, but if
    you're wanting hook clips like the original it'll cost you $80+ to fit a
    full set. (And you'd be missing the connector to the pod which, while
    simple, is custom.) You'll probably want to be sure they're intact
    too.

    Check the closed eBay auctions to get an idea of the price ranges.
    FWIW, I'm very happy with my HP1630G, and the manual can be found online
    for free.
     
  4. Nico Coesel

    Nico Coesel Guest

    Good point.
    There are several examples of logic analyzers that use passive probes.
    The digital inputs on the HP/Agilent mixed signal oscilloscopes are
    passive. The Tektronix TLA510 / DAS9200 are often equipped with a
    92C96 analyzer board which also uses a passive probe cable. I had no
    problems with it while doing measurements on an operating PCI bus.
     
  5. Dan

    Dan Guest

  6. Richard

    Richard Guest

    Looks like the probe clips are missing. In the ends of the pods, those
    rectangular holes have a series of 11 pins. There's normally a plastic
    connector that clips in with ~6" leads with removable hook clips.

    Depending on how you'll use the unit, you may find that making your own
    fixture attachments for the probes are easier to work with than
    connecting 40+ clips to your project anyway. But with the pin spacing,
    count (11 instead of more common 10-pin connectors), and shape (they're
    rectangular pins), I haven't found a connector fitting or freestanding
    crimp that fits right yet. IIRC, it's close to a Molex KK 0.156"
    connector, but not quite.

    The opening bid at $150 is too high. Check the closed auctions to find
    the current market price.

    This one looks more complete (leads *and* clips), has a more reasonable
    starting bid. Should be similar in functionality to the above unit, but
    adds the scope feature and has a few less channels. I can't comment on
    the scope's quality, but if you don't have one it's a good addition.

    Again, check for current market prices, but I recall these typically go
    for a little more than the 1630G.

    Good luck!
     
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