Amplitude: Reading Between the Ticks
Author: Funny Items
Release time: 2026-08-31 02:34:35
View number: 13
Amplitude: The Hidden Metric
Beyond rate and beat error, amplitude tells you how healthy the movement's energy delivery really is. Here is the deep explanation.
What Amplitude Measures
Amplitude is the total angle the balance wheel swings through each oscillation. Healthy range: 270–310° on a fully wound NH35.
Why It Matters
| Amplitude | Meaning |
|---|---|
| Above 310° | Over-wound or lubrication issue — balance swinging too far |
| 270–310° | Healthy — energy delivery optimal |
| Below 250° | Dried oil or weak mainspring — service approaching |
| Below 200° | Watch may stop — service urgently |
The Rate vs Amplitude Distinction
A watch can show "good" rate (±10 sec/day) but terrible amplitude — meaning it runs correctly now but will fail soon as oil continues degrading. Amplitude is the leading indicator; rate is the lagging indicator. Always check both.
Timegrapher readings explained in our advanced guide; traces interpretation in the visual guide.
Frequently Asked Questions
Can I improve amplitude at home?
Not without service tools — low amplitude requires fresh oil and potential mainspring replacement. See our service guide.