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Unexpected Power Spike with Nordic’s Power Profiler Kit II

Posted by JeremyCook
5:05 pm
25/04/2025

Doing some experimentation with Nordic’s Power Profiler Kit II https://www.nordicsemi.com/Products/Development-hardware/Power-Profiler-Kit-2 measuring a red LED with a ~1000 ohm resistor in series. When switched on it reads somewhere around 1.5 mA, which makes sense, but there’a a brief spike when the power supply is turned off.

Kind of surprising, but perhaps it’s because of some sort of capacitive/inductive effect? Or maybe it’s more of a matter of how the power measurement device is set up, given that I’m turning the LED off via the PPK II, not letting it do it’s thing so to speak.

Thoughts?