ISO 3159:2009
Timekeeping instruments — Wrist-chronometers with spring balance oscillator
ISO 3159:2009 lays down the definition of the term “chronometer”, describing the categories, the test programme and the acceptable minimum requirements for wrist-chronometers.
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Scope
Normative references
Terms and definitions
Categories of wristwatch
Definition of criteria
General
mean daily rate
mean variation in rates
Vmax: greatest variation in rates
D: difference between the rates in horizontal and vertical p
P: greatest deviation in rates
C: variation in rate as a function of temperature
R: resumption of the rate
Test programme)
Minimum requirements
Previous versions
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Scope
Normative references
Terms and definitions
Categories of wristwatch
Definition of criteria
General
mean daily rate
mean variation in rates
Vmax: greatest variation in rates
D: difference between the rates in horizontal and vertical p
P: greatest deviation in rates
C: variation in rate as a function of temperature
R: resumption of the rate
Test programme)
Minimum requirements