The Power Profiler app comes with two sampling modes: Data logger and Scope.
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The Data logger sampling mode lets you examine the power continuously over a period of time. It has its own sampling parameters and lets you use the Live Now toggle to jump back to displaying the live measurement.
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The Scope sampling mode lets you sample only when the values specified for the Length and Level sampling parameters have been reached. You can use the blue slider on the Y-axis to dynamically select the value of the Level parameter.
Both modes have their own sampling parameters, but share most of the sampling chart UI, explained in the following sections.