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question: sensitive device to measure very small changes in electrical/magnetic fields?

Discussion in 'Electronic Equipment' started by Brother Numzi, Jul 23, 2005.

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  1. Hello

    I am looking for some equipment that is _very_ sensitive and is capable of
    measuring _very_ small changes in electrical fields and magnetic fields? The
    device must be able to record the measurements real time.

    What should I be looking for?

    Thanks :eek:)
     
  2. Well, if you don't know which field you want, then how are we supposed
    to know? Try a ferrite rod with several thousand turns of fine wire on
    it, and plug it into the mic input of an audio amp.
     
  3. CJT

    CJT Guest

    For a moment there, I thought you were looking for a mirror
    galvanometer, but maybe not, since you don't seem to be interested
    in currents as much as fields.
     
  4. Rich Webb

    Rich Webb Guest

    Small changes in large fields? Small changes in small fields? Both
    electrical and magnetic fields, simultaneously, or would one or the
    other be sufficient? What changes; intensity, polarization, direction,
    or ...? Record to what precision? Record with what accuracy? Calibrated
    or just "as built?" Is it sufficient if the measurements are time
    stamped and spooled to permanent media or must they be streamed? Should
    "real time" be synced to the UTC(USNO) master clock (how closely?) or is
    a precision delta-time sufficient? What sample rate? What is your
    budget? Does the device need to be UL/FCC/EC/etc. approved? One-off
    benchtop for curiosity or to gather data for peer reviewed publication?

    Numbers.
     
  5. Rich, you need to make up a standard geek form for this kind of thing.
    Like

    Small changes in:
    [ ] large fields
    [ ] small fields
    [ ] Both

    [ ] magnetic field
    [ ] electric field
    [ ] simultaneous

    Etc..

    Don't forget to include your standard rates for customers. ;-)

     
  6. Keyser Soze

    Keyser Soze Guest

    I two wood like a sensitive peace of mesurment device that due these things.

    Should have a frequency range from 0.01Hz to 453GHz +/- 0.004dB linearity.

    Sensitivity for field strength needs to be at least 2.2femtoV/kM.
     
  7. Rich Webb

    Rich Webb Guest

    Hmmm... probably should inlude a discount for anybody that still
    remembers (and uses) usenet. '-)
     
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