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Re: Ragowski(sp?) coils



Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

Rogowski or Rogovski  (the W is pronounced like a V)

They are a standard technique for measuring currents.  Imagine a coil wound
on a toroid made of air (or some non-magnetic material), through which the
conductor being measured passes.  The voltage output of the coil is
proportional to di/dt, and with proper choice of external components (i.e. a
capacitor and resistor) to make an integrator, you can get I (current).  As
you can imagine, the calibration and frequency response are a bit tricky,
since there is the parasitic C and L to deal with.

They have been largely superseded by semiconductor Hall Effect probes which
measure the magnetic field produced by the current in the conductor, and
which have potentially much better bandwidth characteristics (subject to the
properties of the amplifiers, etc.)

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, December 31, 2000 1:03 PM
Subject: Ragowski(sp?) coils


> Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>
>
> Hi All,
>
> David Mckinnon mentioned using "Ragowski coils" as a possible high
> frequency current tap to measure Tesla coil currents.  I tried searching
> the net for information but I think I am spelling the name "Ragowski"
wrong
> and I couldn't find anything.  These are simply air core current
> transformers that have high bandwidth.  Perhaps a much better alternative
> to the resistors my fiber probes now use.
>
> Any info and especially the correct spelling would be appreciated. ;-))
>
> Cheers,
>
> Terry
> terrellf-at-qwest-dot-net
>
>
>