Hall effect

> Isolated current sensing, have a look at the following...
>
> http://www.allegromicro.com/en/Products/Part_Numbers/0714/index.asp


Or linear optocoupler
Claim 0.01% linearity
Avago HCNR201-500E
Price not marvellous, but cheaper available AND a good 
enough emulation may be doable with OTS dual and quad optos.

    http://www.avagotech.com/assets/downloadDocument.do?id=1724

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