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HP1740A X-Y Mode

Discussion in 'Electronic Equipment' started by Andrew Holme, Dec 24, 2004.

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  1. Andrew Holme

    Andrew Holme Guest

    I would like to build the Lorenz Attractor circuit mentioned in the recent
    "Neato chaotic equations for analog computers" thread, but my HP1740A 'scope
    has no external-X horizontal input.

    On the back of the 1740A are 3 BNC sockets labelled HORIZ, VERT and Z-AXIS
    for connecting a 1607A logic analyzer. I presume these work when the yellow
    "STATE DSPL" button is depressed? Does anyone know what voltage levels are
    required to drive these inputs? I have no data on the 'scope ...

  2. John Larkin

    John Larkin Guest

    But a 1740A *has* x-y mode. It's just called A-vs-B.

  3. Andrew Holme

    Andrew Holme Guest

    OK, thanks. I see now. I've just done a Google image search for 1740A and
    found this:

    My 1740A has a yellow "STATE DSPL" button where the A-vs-B button should be!
    There's a yellow stick-on label around the button covering up the original
    legend. Looks like some sort of option. Bummer. Anyone know how to
    re-enable the A-vs-B functionality?
  4. Andrew Holme

    Andrew Holme Guest

    It's possible my 1740A has option 101 which is described as "Optimum
    performance with the 1607A Logic State Analyzer to provide both digital
    logical state and analog electrical analysis." Any info on how to roll back
    this option would be appreciated.
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