nrf52 power consumption system ON mode，have some Current burr？

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Current consumption
BLE event total charge	9.10 µC
Idle current	2.0 µA
Total average current	89 µA

I used nordic ble_app_pwr_profiling，nordic PCA10040，test instrument is N6705C，but my test is 6-7uA，why？

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thanks you kenneth！