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Current Probes

Discussion in 'Electronic Design' started by Tim Wescott, Jul 3, 2007.

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  1. Tim Wescott

    Tim Wescott Guest

    Who sells decent current probes?

    I'm looking for a clamp-on current probe. I'm willing to settle for
    less than stellar accuracy (+/-5% would be close enough), but it has to
    work down to DC. A range of 0-20A would be sufficient for now, but more
    is better if I can switch ranges.

    A quick perusal of Tucker Equipment sales got lots of hits, at
    disappointing prices.



    Tim Wescott
    Wescott Design Services

    Do you need to implement control loops in software?
    "Applied Control Theory for Embedded Systems" gives you just what it says.
    See details at
  2. Joel Kolstad

    Joel Kolstad Guest

    Tektronix. I have a couple of TCP202s
    (,,51-10736-INTRO_EN,00.html), and they're great.
    They do use the TekProbe 2 interface, though, so you need the ugly/expensive
    interface box if you're using them with non-Tek scopes.

  3. BFoelsch

    BFoelsch Guest

    What frequency range?
  4. Tim Wescott

    Tim Wescott Guest

    DC to 100Hz or so is all I need right now. More is always better, but
    that's what I'd be willing to spend $$ on.


    Tim Wescott
    Wescott Design Services

    Do you need to implement control loops in software?
    "Applied Control Theory for Embedded Systems" gives you just what it says.
    See details at
  5. Jim Thompson

    Jim Thompson Guest

    Surf on LEM Current Probes

    ...Jim Thompson
  6. john jardine

    john jardine Guest

    Marvellous bit of kit. I'm rarely surprised but it did it for me.
    Really weird to see DC current going in and out of a battery and the same
    for the individual DC branch currents.
  7. redbelly

    redbelly Guest

    Just a hunch: I'll bet the DC measurements on this thing do not
    involve the clamp-on, but rather some in-line connections.

    Seems odd (to me) that the AC frequency range (100Hz to 1000kHz) does
    not include line frequency, but I suppose there is a reason for it.

  8. john jardine

    john jardine Guest

    It's hall effect so just clamp it on as normal. That "100Hz" looks odd to me
    as well. I'll have a look at the user manual tomorrow.
    It's mainly used at 50Hz and the readings are identical to other '50Hz
    rated' AC RMS clamps. Also had it down at 20Hz OK.
  9. Robert Baer

    Robert Baer Guest

    Make your own fluxgate sensor.
  10. Robert

    Robert Guest

    You might try BellNorthWest since you're in the area. The prices seem better
    than Tuckers and they're just North of the Portland area in Washington.

    We just bought one of the older Tek Current Probes. Don't remember the Model
    number, it's at work.

  11. scada

    scada Guest

    I have several of the Tek model 610 (If I remember the # right). All current
    probes (clamp on type) that I have researched use Hall sensors for DC. If
    you only need AC, I suggest going with the CT type. The Tek worked great
    until we went overcurrent on a test. It destroyed three of our four probes!
    Fried the Hall sensors. I have not been able to find a replacement for the
    sensor and Tek support says it's not worth fixing! 3* $600, maybe not worth
    it to them!!!
  12. Jim Yanik

    Jim Yanik Guest

    TEK "support" has really slipped in the last 10-15 years.
    I used to repair P6042 and A6302/6303 current probes while at TEK.
    (their probe xfmrs were TEK-made,thus costly and not available elsewhere.)
  13. The Fluke Y8100 is good from DC-1kHz and is often available at a
    reasonable price on eBay. It has 20A and 200A ranges.
  14. john jardine

    john jardine Guest

    It's in spec' from DC to 100kHz. For some unknown reason it's the frequency
    counter bit that only starts working at '99.99'Hz.
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