Re: [SI-LIST] : voltage measurements using a current probe

Charles R. Patton (patton@dt.wdc.com)
Mon, 13 Sep 1999 16:39:56 -0700

Doug,
I have a question re your "voltage measurements using a current probe"
after looking at the tech note. It would seem to me that the method is
suspect as it is exactly the same configuration as used for directional
couplers. So if there is an accompanying voltage swing, as there would
normally be for most signal wires, then how would you avoid confusing
the capacitive voltage coupling from the inductive di/dt coupling? It
would seem that twisting the probe 180 degrees would discern that the
effect is taking place, just as it does in directional couplers (i.e.,
Bird wattmeters) but without knowing the voltage/current ratio on the
line (in effect the line impedance) then I would guess that it would be
hard to extract the two simultaneous effects.
Sincerely,
Charles R. Patton

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