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'Scope question

Discussion in 'Electronic Design' started by no_one, Oct 24, 2003.

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  1. no_one

    no_one Guest

    The probe needs to be compensated with a square wave to get it pass
    properly. On the TEK probe it used to be done by loosening the tip and
    screwing in or out of the probe body until a good square wavbe was
    presented, then tightening it down.
  2. Jon Yaeger

    Jon Yaeger Guest

    I bought a Velleman scope probe for a Tek 7603.

    I was trying it out with A/C and DC sources and noticed that it blocked DC.

    I then hooked up a Tek probe which passed both A/C & DC.

    Both probes, when hooked up to a square wave generator at about 3 kHz,
    really ruined the waveforms - one looked like a high pass filter and the
    other like a low pass.

    When I hooked the waveform generator directly into the 'scope the waves
    looked perfect.


    1) I didn't realize there are "A/C only" scope probes. What's up with that?

    2) I work on audio gear for a hobby. What kind of probe should I use that
    won't distort the frequencies in question?



  3. Most newer Tek probes have a little screwdriver-accessible adjustment for
    right on the side of the little metal box at the BNC connector.

    On the really old, huge, dark gray Tek probes you loosen the ribbed collar
    and turn the probe top around to adjust it.

    I see from the Velleman scope specs they say "compensation range: 10 to 35
    pf", so
    the Velleman probe has an adjustment for this too somewhere.
  4. Jim Yanik

    Jim Yanik Guest

    That's the old procedure used for probes from the tube-type scope era.Newer
    TEK probes have a trimmer cap,or both cap and pot,inside the comp box.
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