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Avionics Test Engineering Intern
Write a real answer. It is graded against the question's stored rubric, the mastery movement is computed by the same engine the product uses, and — the part worth watching — the next question is chosen by the real scheduler from what you have already answered. Nothing is saved and no tokens are spent.
Bench setup: 500 MHz scope, 10x passive probe with the standard ground lead, board powered from a lab supply.
You probe a 3.3 V SPI bus running at 20 MHz and see significant ringing on the clock edges. The link works most of the time but drops a transaction roughly once every few thousand. Walk me through what could cause the ringing and how you would confirm it.