timegrapher.ai
Press Scan and rest your watch by the microphone.
No signal detected. Try holding your watch closer to your microphone, or use a quiet room. A clip-on contact mic (~$15) dramatically improves accuracy.
Rate
—s/d
—
Beat error
—ms
—
Amplitude
—deg
—
Frequency
—bph
—
— measured
Advanced · the fine print
Stability σ—s/d std dev
Half period—ms measured
Beats—per analysis
Tic interval—ms
Toc interval—ms
Tic / toc—ideal 0.500
Rate trend · last 0 readings
Positions · the timing sheet
Label readings with the position chips below to build your timing sheet.
Paperstrip
Tic waveformtick sound shape, averaged
Toc waveformtock sound shape, averaged
Full periodone complete tic–toc cycle
- Rate (s/d)
- Seconds per day the watch gains (+) or loses (−). COSC chronometer standard is −4 to +6 s/d. Under ±15 s/d is fine for daily wear.
- Beat error (ms)
- How unequal the tick and tock are. Under 0.5 ms is excellent; under 1.5 ms is acceptable. Over 2.5 ms can cause the watch to stop.
- Amplitude (°)
- How far the balance wheel swings each beat. 220–310° is healthy. Below 200° suggests a weak mainspring or dirty movement.
- Paperstrip
- A running trace of every tick/tock event. Vertical columns = well-regulated. Angled columns = rate error. Wide scatter = inconsistency.
- BPH (beats/hour)
- The frequency of the movement. Set this to match your movement. Common: 18 000 (5 Hz), 21 600 (6 Hz), 28 800 (8 Hz).
- Lift angle (°)
- A fixed property of your movement needed for amplitude accuracy. Check your movement's datasheet. Common values: 49–53°.
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