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INA226: 1uA measure current resolution for INA226

Part Number: INA226


I'm testing INA226EVM.

Shunt resistor is 8.2ohm.

because 81.92mV / 10mA = 8.192ohm

When I connected 100 kilo ohm for load, INA226's current displayed 39.34uA and ampere meter is 33.2uA.

What's my fault?