Electronics > Projects, Designs, and Technical Stuff
DIY DC Current Probe?
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0xdeadbeef:
Some parts of this design look strangely familiar...
But isn't this going to topple over when you attach a BNC. Won't it be a PITA?
Just kidding  ;)
Jeroen3:
Yes, strangely familiar because I couldn't find an extruded profile enclosure small enough.
And yes, it will probably topple. I could prevent this not by mounting the banana's on the lid. Maybe I will.
But I'm afraid any cables will offset the sensor.
mk_:

--- Quote from: Jeroen3 on October 05, 2017, 05:38:55 am ---But I'm afraid any cables will offset the sensor.

--- End quote ---

You should talk about your concerns with Sensitecs tech-support... very helpfull and friendly people...

IDEngineer:
Idea: ACS chips were mentioned earlier in this thread. Some members of the ACS current sensor family sense differentially, to reduce/eliminate sensitivity to external fields. We've used these extensively and they work really well. It would be quite straightforward to throw together a demo of one meant as a scope probe... pick the part with the lowest range so you get the greatest sensitivity. We're able to discern at least 10's of mA with them in our applications, if that's enough for you. Very low insertion resistance so minimal impact on the DUT. And you get DC+AC in the deal, so no weird rolloff as you approach DC.

I personally prefer the clamp-around style so you're not "in the circuit" at all, but most of the examples in this thread seem to be of the insertion type.

Just a thought....
Jeroen3:
Allegro Microsystems isn't that high bandwidth or accurate ans Sensitec. But they are also cheaper and smaller.
I also prefer the clamp around style, but those are expensive. And, if you want to measure on a PCB, you are still out of luck with a clamp.
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