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Hall effect scope probe??

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hlavac:
I need to trace actual magnetic field of a coil with a scope, possibly with up to 1MHz bandwidth, does anyone have a schematic / recommendation for some kind of hall effect probe i could use? Not interested in absolute precision, more like the shape of the EMF in time

jmelson:

--- Quote from: hlavac on June 22, 2020, 10:36:27 am ---I need to trace actual magnetic field of a coil with a scope, possibly with up to 1MHz bandwidth, does anyone have a schematic / recommendation for some kind of hall effect probe i could use? Not interested in absolute precision, more like the shape of the EMF in time

--- End quote ---
Wow, I'm not sure you can get 1 MHz out of a Hall effect device.

Jon

hlavac:
Yeah, may not be possible with just a hall sensor. What I need is basically what a DC/AC current clamp probe does... and those are expensive as hell

Maybe there are alternative ways to measure EMF?

Magnet glued to a strain gauge?
Probably too low bandwidth...

Or cut open a crystal and glue a tiny magnet or piece of iron / ferrite to it, watch what it does to the frequency as the magnetic field changes?

exe:
What about this http://electronics-diy.com/simple-emf-probe.php ?

EDIT there are also DIY near-field probes, I'm not sure if this those are useful: https://www.eevblog.com/forum/projects/diy-magentic-field-probes/ .

David Hess:

--- Quote from: exe on June 23, 2020, 12:21:43 pm ---What about this http://electronics-diy.com/simple-emf-probe.php ?
--- End quote ---

But from the description, he needs operation down to DC which requires either a flux-gate or hall effect sensor.

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