ISO 6426-2:2002 時計の語彙 — Part 2: 技術的および商業的定義 | ページ 2

3.1

time

undefined medium in which existing objects appear to develop irreversibly in the changes which they undergo, and in which events and phenomena appear to occur in their succession

Note 1 to entry: To this medium corresponds a quantity, t , allowing, in a time scale, the chronological filing of events.

3.2

date

notation of an instant in a time scale

Note 1 to entry: In current use, this term stands for the indication of the year, month, day and day of the month.

3.3

duration

time which elapses between two determined dates

3.4

period

duration characterized by a repetitive phenomenon

3.5

frequency

number of periods per second

Note 1 to entry: Frequency is expressed in hertz (Hz), e.g. 32,768 kHz = 32 768 Hz, 8 MHz = 8 000 000 Hz. For pendu­lum and spring balance oscillators, the number of alternations per hour can be given, e.g. 2,5 Hz = 18 000 alternations per hour.

3.6

alternation

displacement of an oscillating body between two extreme positions

Note 1 to entry: This concept also applies to the representation of any periodic phenomenon.

Note 2 to entry: The beating frequency of a balance wheel is currently given in “alternations per hour”. For an oscillator of 2,5 Hz (beating every fifth of a second), five alternations per second correspond to 18 000 alternations per hour.

3.7

oscillation

complete cycle of a periodic phenomenon (twice an alternation)

3.8

amplitude

value of the displacement, angular or linear, between the rest position and an extreme position of an oscillating part

Note 1 to entry: This concept also applies to the representation of any periodic phenomenon.

3.9

isochronism

aptitude possessed by a phenomenon to reproduce itself in equal periods of time whatever the external influences

3.10

thermal compensation

device intended to compensate the effect of temperature variation on the chronometric characteristics of a time-measuring instrument

3.11

automatic

functioning by itself

Note 1 to entry: This term used for mechanical time-measuring instruments which operate without the need for manual re-winding. Also used as a noun: an “automatic” (for an “automatic watch”).

3.12

movement fitting

lateral dimensions of the plate serving as a reference for the assembly with the case of the time-measuring instrument

Note 1 to entry: On traditional ebauches, these dimensions are generally smaller than the largest dimension of the movement.

3.13

ligne

line

old unit of length used commercially to designate approximately the dimensions of a movement

Note 1 to entry: One line is equal to 2,256 mm.

3.14

regulation

operation permitting improvement of the accuracy of a time-measuring instrument

3.15

consumption

electrical current generally required in normal use for time-measuring instruments

Note 1 to entry: For watches, the consumption is most often expressed in microamperes.

3.16

power reserve

duration for which a time-measuring instrument can operate on its own power reserves without further external power

3.17

autonomy

ability of a time-measuring instrument to function on its own reserves, with any external energy supplied to it by its normal environment but independently of any conscious intervention on the part of the user

Note 1 to entry: This term is also used to designate the duration for which this ability is maintained.

3.18

water-resistance

ability of a time-measuring instrument to resist water penetration, as specified in ISO 2281

3.19

antimagnetism

ability of a time-measuring instrument to withstand a magnetic field, as specified in ISO 764

3.20

practical battery life

life of a timekeeping instrument without a new energy supply

3.21

theoretical running time

estimate of the duration of running of a timekeeping instrument resulting from a calculation that does not include factors that influence its working