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User manualFAQ

Why does ADC measure differently than main current measurement?

If you supply your device with main current and at the same time measuring the current consumption over a sense resistor into ADC, the measurements will not be the same.

The reasons are:

  1. The current measurement resolution is higher for the main current measurement than for the ADC current measurement due to that main current measurement switches between different intervals.
  2. There is a bigger offset error for the ADC measurement than for the main current measurement.
  3. For Otii Arc Pro there is a leakage into the ADC pins, in the order of 10uA, and this current will be measured by the main current measurement but not by the ADC current measurement.

Due to this, you will get the most accurate measurement by using the main current measurement.