[sdiy] Voltage vs current, was Low voltage synthesis?

Ingo Debus igg.debus at gmail.com
Tue Jan 18 14:50:37 CET 2022

> Am 18.01.2022 um 09:25 schrieb cheater cheater <cheater00social at gmail.com>:
> jesus, that's a grand for a probe. but it's no contact, so that's
> nice... how does it work?

You can spend much more for a current probe.

Quote from the instruction manual 
(https://resources.aimtti.com/manuals/I-prober_Instruction_Manual-Iss7.pdf, introduction, on page 2):

"This current probe employs a sensing method generally known as a fluxgate magnetometer, and
measures the magnetic field surrounding the electric current. The magnetometer consists of a small
coil of wire surrounding a core made of an advanced material with special magnetic properties. An
excitation current (at approximately 40MHz) is passed through the coil, which magnetises the core
alternately in opposite directions. If there is no external magnetic field, this magnetisation is
symmetrical. When an external field is applied, the resulting asymmetry is detected by a feedback
loop which applies an opposing current through the coil to restore the net field to zero. The output
voltage is proportional to this opposing current, and therefore to the magnitude of the field“

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