Vibrations per hour (vph, VPH) is a
mechanical timepiece specification. It is used to express the frequency of a
watch movement
A watch is a portable timepiece intended to be carried or worn by a person. It is designed to keep a consistent movement despite the motions caused by the person's activities. A wristwatch is designed to be worn around the wrist, attached by ...
.
VPH describes the number of times that a
vibrating timekeeping
Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future. It is a component quantity of various measurements used to sequence events, to ...
component completes a vibration cycle in 1 hour. More vibrations per hour yields higher timekeeping
resolution, and usually indicates a higher
precision
Precision, precise or precisely may refer to:
Science, and technology, and mathematics Mathematics and computing (general)
* Accuracy and precision, measurement deviation from true value and its scatter
* Significant figures, the number of digit ...
mechanical movement.
See also
*
Hertz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that o ...
(Hz)
References
Clocks
Units of temporal rate
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