1、BS ISO 3159:2009ICS 39.040.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTimekeepinginstruments Wrist-chronometers withspring balanceoscillatorThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 28 February20
2、10. BSI 2010ISBN 978 0 580 68480 7Amendments/corrigenda issued since publicationDate CommentsBS ISO 3159:2009National forewordThis British Standard is the UK implementation of ISO 3159:2009.The UK participation in its preparation was entrusted to TechnicalCommittee STI/53, Specifications and test me
3、thods for jewellery andhorology.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standar
4、d cannot confer immunityfrom legal obligations.BS ISO 3159:2009Reference numberISO 3159:2009(E)ISO 2009INTERNATIONAL STANDARD ISO3159Second edition2009-12-15Timekeeping instruments Wrist-chronometers with spring balance oscillator Instruments horaires Chronomtres-bracelet oscillateur balancier-spira
5、l BS ISO 3159:2009ISO 3159:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the
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8、 at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing fro
9、m either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedBS ISO 3159:2009I
10、SO 3159:2009(E) ISO 2009 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each m
11、ember body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
12、Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards a
13、dopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of p
14、atent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3159 was prepared by Technical Committee ISO/TC 114, Horology. This second edition cancels and replaces the first edition (ISO 3159:1976) which has been technically revised. BS ISO 3159:2009BS ISO 3159
15、:2009INTERNATIONAL STANDARD ISO 3159:2009(E) ISO 2009 All rights reserved 1Timekeeping instruments Wrist-chronometers with spring balance oscillator 1 Scope This International Standard lays down the definition of the term “chronometer”, describing the categories, the test programme and the acceptabl
16、e minimum requirements for wrist-chronometers. NOTE Wristwatches using a tuning fork oscillator are subjected to these tests pending the availability of separate standards. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated ref
17、erences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3158, Timekeeping instruments Symbolization of control positions 3 Terms and definitions For the purposes of this document, the following terms and d
18、efinitions apply. 3.1 chronometer precision wristwatch regulated for different positions and for various conditions of use NOTE 1 Conformity to the definition of chronometer will be certified by a neutral official authority that checks the watch, or if necessary the movement, and issues an official
19、certificate. NOTE 2 A wristwatch described as a “chronometer” must satisfy the minimum requirements laid down in Clause 7. 4 Categories of wristwatch Wristwatches are divided into two categories dependent on casing diameter or casing-up surface. Category Casing diameter mm Casing-up surface mm21 20
20、314 2 u 20 u 314 BS ISO 3159:2009ISO 3159:2009(E) 2 ISO 2009 All rights reserved5 Definition of criteria 5.1 General The condition of the watch designated by the letter Eiis obtained by subtracting the standard reference time from the time indicated by the watch. The time is observed to within limit
21、s of 0,5 s. The condition is rounded to the nearest full second. The daily rate, Mi, is obtained by subtracting the condition observed 24 h earlier from the condition on the day of observation; it is expressed by the following formula: ()1d1iiiMEEt= where td= 1 (one day); i = 1, 2, , 15. By conventi
22、on, this daily rate, Mi, is expressed in seconds per days (s/d). It is positive if the watch gains and negative if the watch loses. 5.2 M : mean daily rate M is the arithmetic mean of daily rates during the first ten days of the tests. ()12 101.10MMM M=+ 5.3 V : mean variation in rates V is the arit
23、hmetic mean of the five absolute values of variations in rates obtained for the five positions of the watch during the first ten days of the tests. ()21 43 1091.5VMMMM MM=+ NOTE The variation in rate is the difference between two consecutive daily rates in identical environmental conditions. 5.4 Vma
24、x: greatest variation in rates Vmaxis the absolute value of the greatest of the five variations in rates with regard to the five positions of the watch during the first ten days of the tests. max 1 maxiiVMM+= where i = 1, 3, 5, 7, 9. BS ISO 3159:2009ISO 3159:2009(E) ISO 2009 All rights reserved 35.5
25、 D: difference between the rates in horizontal and vertical positions of the watch D is obtained by subtracting the average of the rates observed in position CH (9th day and 10th day) from the average of the rates observed in position 6H (1st day and 2nd day). ()()12 9101122DMM MM=+ 5.6 P: greatest
26、deviation in rates P is the absolute value of the greatest of the ten differences between one of the first ten rates and the mean daily test rate. maxiPM M= where i = 1, 2, , 10. 5.7 C: variation in rate as a function of temperature C is obtained by subtracting the rate at 8 C from the rate at 38 C,
27、 the total being divided by the temperature difference, expressed in degrees Celsius. 13 1130MMC= 5.8 R: resumption of the rate R is obtained by subtracting the average of the first two rates from the last rate. 12152M MRM+= BS ISO 3159:2009ISO 3159:2009(E) 4 ISO 2009 All rights reserved6 Test progr
28、amme1)Day PositionaNominal temperaturebC EiMi0 6H 23 1 6H 23 M12 6H 23 M23 3H 23 M34 3H 23 M45 9H 23 M56 9H 23 M67 FH 23 M78 FH 23 M89 CH 23 M910cCH 23 M1011 CH 8 M1112 CH 23 M1213 CH 38 M1314 6H 23 M1415 6H 23 M15E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 E10E11E12E13E14E15aSee ISO 3158. bThe tolerance on the t
29、emperature is 1 C. c Auxiliary mechanisms, the functions of which can be interrupted, shall be made to function only on the 10th day.1) Normally, there shall be no interruption during the tests. BS ISO 3159:2009ISO 3159:2009(E) ISO 2009 All rights reserved 57 Minimum requirements Minimum requirement
30、s Categories Criteria Units 1 2 M Mean daily rate s/d 4 +6 5 +8 V Mean variation in rates s/d 2 3,4 VmaxGreatest variation in rates s/d 5 7 D Difference between the rates in horizontal and vertical positions of the watch s/d 6 +8 8 +10 P Greatest deviation in rates s/d 10 15 C Variation in rate as a
31、 function of temperature s/(dC) 0,6 0,7 R Resumption of the rate s/d 5 6 NOTE The minimum requirements are considered to be absolute limits and no calculation result shall be rounded off. BS ISO 3159:2009ISO 3159:2009(E) ICS 39.040.10 Price based on 5 pages ISO 2009 All rights reserved BS ISO 3159:2
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