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Scope Probe for 0.40mm Pin Spacing

Discussion in 'Electronic Design' started by Harry Dellamano, Aug 10, 2013.

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  1. So I am struggling with the above problem. I am comfortable with the normal
    pointed scope probe on 1.00mm spaced pins but 0.40mm are a PITA. There must
    be some fixture that can be mounted and control XYZ to make a adequate
    connection to the pin for probing. No, there are no thru holes or components
    available that help probe these pins.
    Thanks, Harry
  2. Joerg

    Joerg Guest

    For me the solution (so far) always came from my wife's stuff: A sewing
    needle. I even had my own from before we married but I wore those out.
    Not so much from sewing but from scraping and probing around electronics.
  3. Nico Coesel

    Nico Coesel Guest

    I solder thin wires (connected to a header) to such pins.
  4. TTman

    TTman Guest

    I use 'Takaya' probe pins... micro point, super sharp and will go through
    conformal coating
  5. Syd Rumpo

    Syd Rumpo Guest

    A small hypodermic syringe works well too, the needles are very sharp
    and the syringe body makes a handy insulated 'handle'. 0.5ml types used
    for insulin are good. Difficult to solder, but the hollow needle will
    readily crimp onto a thin wire.

    Actually, these are good for all sorts of things, including using them
    as miniature crowbars to lift component legs for debugging or complete
    part removal. I have dozens from a deceased relative.

  6. Joerg

    Joerg Guest

    I often use syringes in my work, mostly for oiling difficult to reach
    shafts, pressure tests, et cetera. Like when the input attenuator shaft
    on a scope seized up. Once when I wanted to buy syringes at a drug store
    the pharmacist looked at my arms (I wore a T-shirt). "No, not for that
    kind of stuff" :)
  7. I imagine sliding something like two pieces of thin plastic between pins
    on either side of the pin to be probed could work

    or maybe a piece of flex pcb slid in between pins, on side connect to pin
    the side other isolated

  8. Sunhayato in Japan makes some test clips for that kind of parts. The FP-7S
    clips are for parts of 0.3-0.5mm lead pitch (0.3mm nominal, allows some
    additional distance to each other). For details see (in the
    picture it's the set of locked-together tiny clips to the left of the QFP).

    Sure, they are not scope probes, but they have connection leads with
    pin-header type sockets at the end, so one could rig a connection to an
    existing scope probe without many difficulties.

    The prices however are in the "run and hide" range. A set of 2 clips
    (FP-7S-02) goes for the equivalent of 60$, a set of 10 with 2 holders
    and a loupe (FP-7S-10) will set you back about 300$.

    They also have a 3GHz version of the 0.3mm pitch clips, complete with a 3mm
    length lead and connection to attach a scope probe (FP-HSP10S1). From the
    picture, the connection lead on these looks really fragile, even by a very
    careful Japanese engineer's definition of "fragile", and their idea of
    "affordable" is around 70$ for one Signal+GND clip pair. The 1GHz version
    (FP-HSP15S1) looks more rugged in comparison, at least in so far as "rugged"
    applies to something with spring contacts in the 2-digit microns, that is.
    There's also a 5GHz version, with no leads at all, but I'm not sure, what
    one would need to even make proper connections to it. Coax hardlines with
    0.8mm diameter maybe, if any such exist.

    Well, maybe Joerg's sewing needle idea is still the best one after all,
    and if no sewing needles happen to be nearby, there's still the option
    of taking one strand out of a bicycle brake cable, crimping it into a
    thin copper tube except for 2-3mm at the end and sharpening the business
    end of it to any needed diameter. 100 micron or so should be possible.

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