WatchesAtlas / Watch knowledge
The Watch Encyclopedia
Understand the details that make a watch.
5 terms
Clear filtersPerformance & measurement
Parts per million
A relative measurement used to express small deviations, including selected oscillator accuracy specifications.
Performance & measurementPositional error
A difference in timekeeping behaviour associated with the watch's orientation during a test or use.
Performance & measurementPositional variation
Differences in rate when a watch is tested in different orientations.
Performance & measurementPower reserve
The stated or measured time a watch can run after reaching its specified energy state before stopping.
Performance & measurementPrecision
Consistency of repeated measurements or running rates.