Help: auto-scale current meter (from mA to 30A)

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TRUNGDPHAN

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Anyone know a design to measure the DC current from mAs to 20A?
Thanks a lot!
 

Can you give a more information.
1. Range ok 1 ma - 20 A
2. Type, DC or AC
3. Accuracy, in % or mA
4. Method that is a acceptable, shunt, current transformer, hall sensor ...
5. If can use the shunt what is the maximum voltage over the resistor
6. You want only one sensor for diapason or can use several sensors
 

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