Electronics > Projects, Designs, and Technical Stuff

Hall effect scope probe??

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0culus:

--- 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 ---

As others have noted, if you want DC and AC response you need a probe that uses a hall sensor and a coil of some kind. I personally use an old Tek P6042 current probe, DC-50 MHz, but it's optimized for clamping on small wires for troubleshooting SMPS (and you need several of them around for parts robbery). The probe head contains both a hall effect sensor and a tiny split core transformer. I am not sure this is necessarily the right tool for your particular use case.

Alex Eisenhut:

--- Quote from: 0culus on July 06, 2020, 05:13:54 pm ---
As others have noted, if you want DC and AC response you need a probe that uses a hall sensor and a coil of some kind. I personally use an old Tek P6042 current probe, DC-50 MHz, but it's optimized for clamping on small wires for troubleshooting SMPS (and you need several of them around for parts robbery). The probe head contains both a hall effect sensor and a tiny split core transformer. I am not sure this is necessarily the right tool for your particular use case.

--- End quote ---

The P6042 is a work of art more than a usable instrument. One bad drop and the transformer cracks and you no longer have a P6042. I had a perfectly working P6042 and one day a slight drop of the probe and it stopped working.

I luckily managed to scrounge a NOS replacement transformer sealed with the compensation resistors but that will never happen again.

And in any case the cable will break at the strain relief sooner or later.

It's fun to have and if you can use yours and not break it, fine, but it's like having a Fabergé egg... For display only.

0culus:
Yeah, that's why I have like...4 of them.  :-DD The one I use has had the probe cable replaced with new cables. The other ones are for robbing parts from should it become necessary.

fmkit:
ACS712ELCTR-05B  worked for me,  just leave current sense pins floating.
 

NiHaoMike:
For AC, a VCR or hard drive head will have excellent high frequency response. A regular Hall sensor works for DC and low frequencies. Maybe all you need is to combine the two...

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