MEMS tachometer
0–100 RPM · W&F
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RPM
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DIN W&F %
Mean —
Drift —
Nominal
W&F standard
A finished 20 s run lands here. Bookmark saves the live pair.
Face-up on the platter. Measure waits 5 s, then records 20 s of W&F and holds. Standards: DIN (IEC 386 quasi-peak), JIS (weighted RMS, 5 s), NAB (unweighted RMS), 2σ. Gyro is 0–100 RPM. MEMS ~60 Hz cannot realize the curve above ~20 Hz. Not a certified lab meter.