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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

peak-to-peak

The highest reading in a window minus the lowest.

Peak-to-peak is max x_i - min x_i over a window; 2A for a sine of amplitude A, and far more sensitive than RMS to single impacts.

Examples

  • A 40 mg sine has a peak-to-peak of 80 mg, the highest reading minus the lowest.

  • A sharp knock on the fan housing moves the peak-to-peak far more than the RMS.

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