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Up to 50A current measurement

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daniel.soares

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Which is the most cheap way to measure currents of this magnitude?
Could I use a toroid and pass the wire in the middle of it?
Shunt resistors are not good, since the Power is too high!!!
Current transformers are too big/expensive...

Does anyone know how to project a toroid???
 

One usual way is to use a series resistance. These are called shunts. They drop about 100 mV or so at their rated full current. They are sold by instrument companies.

I would avoid making your own current transformer if this is an audio or lower frequency. If you must, use a tape wound core which has higher mu.
 

maybe this?

/http://www.elektroda.pl/eboard/searchtopic71752-automotive.html+ampmeter
 

Maybe this too:

**broken link removed**

Regards!
 

I think if you use toroid,it only sence ac current,no dc.
 

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