BS ISO 10553-2003 Horology - Procedure for evaluating the accuracy of quartz watches《钟表学 石英表准确度评价规程》.pdf

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1、BRITISH STANDARD BS ISO 10553:2003 Horology Procedure for evaluating the accuracy of quartz watches ICS 39.040.10 BS ISO 10553:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 8 August 2003 BSI 8 August 2003 ISBN 0 580 42435 9 National fo

2、reword This British Standard reproduces verbatim ISO 10553:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee STI/53, Specifications and test methods for jewellery and horology, which has the responsibility to: A list of o

3、rganizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence

4、Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself

5、confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and prom

6、ulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 14, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments

7、issued since publication Amd. No. Date Comments Reference number ISO 10553:2003(E) OSI 3002INTERNATIONAL STANDARD ISO 10553 First edition 2003-03-01 Horology Procedure for evaluating the accuracy of quartz watches Horlogerie Procdure dvaluation de la prcision des montres quartz BSISO10553:2003IS:355

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13、 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Symbols and units 2 5 Practical factors affecting accuracy . 2 5.1 General. 2 5.2 Accuracy 2 5.3 Influence of temperature on accuracy 2 5.4 Accidents or abnormal environment 3 6 Types of measurement. 3 7 Test methods. 3 7.1 General t

14、est conditions 3 7.2 Ageing test programme 4 7.3 Temperature simulation test programme.5 7.4 Uncertainty of measurement 5 8 Calculation of accuracy 6 8.1 General. 6 8.2 Calculation of the effect of ageing on accuracy 6 9 Relationship between the calculated accuracy and the accuracy classification in

15、dicated 7 10 Indication of the accuracy classification 7 Annex A (normative) Statistical evaluation of accuracy 8 Annex B (normative) Evaluation of coefficients a and c from the differences of rates 11 Annex C (informative) Reliability. 13 Bibliography . 14 BSISO10553:2003IS:35501 O3002(E) iv I SO 3

16、002 All irhgts seredevrForeword 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 member body interested in

17、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 Electrotechnical Commissi

18、on (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 adopted by the technical c

19、ommittees 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 patent rights. ISO shall n

20、ot be held responsible for identifying any or all such patent rights. ISO 10553 was prepared by Technical Committee ISO/TC 114, Horology, Subcommittee SC 11, Indication of accuracy. BSISO10553:2003INTENRATIONAL TSANDADR IS:35501 O3002(E)I SO 3002 All irhgts seredevr 1Horology Procedure for evaluatin

21、g the accuracy of quartz watches 1 Scope This International Standard specifies the procedure for evaluating the accuracy of quartz watches, individually and by lots, and the relationship between the accuracy tested and the accuracy classification given by the manufacturer. It applies to quartz watch

22、es having accompanying documents on which the accuracy classification is indicated. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of th

23、e referenced document (including any amendments) applies. ISO 3158, Timekeeping instruments Symbolization of control positions ISO 3207:1975, Statistical interpretation of data Determination of a statistical tolerance interval 3 Terms and definitions For the purposes of this document, the following

24、terms and definitions apply. 3.1 quartz watch with accuracy indication quartz watch, the accuracy classification of which is indicated in its accompanying documents, such as operating instructions, prospectus, labels, etc. 3.2 indicated accuracy classification accuracy in standardized measuring cond

25、itions and affected by practical factors described in Clause 5 and evaluated in accordance with the methods specified in Clause 7 3.3 display accuracy classification indications showing the hours and minutes and having at least one component displaying the seconds to enable the state to be checked (

26、in view of the fact that the accuracy classification is expressed in seconds) BSISO10553:2003IS:35501 O3002(E) 2 I SO 3002 All irhgts seredevr4 Symbols and units The symbols and units for ageing, temperature simulation and accuracy are given in Table 1. Table 1 Symbols and units of measurement Symbo

27、l Unit Term Ageing a d 1coefficient of the logarithmic function applied c s/d coefficient of the logarithmic function applied t dd time interval M Bs/d average daily rate for the first three days of the ageing test (stage II) M Ms/d average daily rate for the middle three days of the ageing test (st

28、age V) M Es/d average daily rate for the last three days of the ageing test (stage VIII) V Vs variation in state over one year due to ageing Temperature simulation M Ps/d average daily rate in simulation of spring M Ss/d average daily rate in simulation of summer M As/d average daily rate in simulat

29、ion of autumn M Ws/d average daily rate in simulation of winter V Ts variation in state over one year due to seasonal changes in temperature Accuracy M ms/m monthly rate M ys/a annual rate 5 Practical factors affecting accuracy 5.1 General The main factors affecting the operating accuracy of quartz

30、watches are temperature and ageing. Accordingly, these two factors are taken into account when evaluating the accuracy. The influence of other factors, such as mechanical impacts, magnetic fields, humidity and supply voltage is low. 5.2 Accuracy The accuracy of quartz watches depends upon temperatur

31、e variations due to the climatic conditions in the places of use. 5.3 Influence of temperature on accuracy Watches are subject to the influence of the ambient temperature, which is variable according to the seasons and geographical location of the wearer. It is not possible to specify absolutely tem

32、peratures simulating seasonal variations in all locations. The effects of temperature on accuracy are calculated arbitrarily at levels corresponding to the average seasonal temperature in temperate climates. BSISO10553:2003IS:35501 O3002(E) I SO 3002 All irhgts seredevr 35.4 Accidents or abnormal en

33、vironment Accidents which quartz watches may suffer such as dropping, exposure to a strong magnetic field or extremely high or low temperatures are not covered by this International Standard. 6 Types of measurement To evaluate the accuracy of quartz watches in accordance with the procedure described

34、 in Clause 7, the condition of the component which displays the seconds shall be measured (this measuring procedure has the advantage of taking the oscillator variance into consideration and of checking the display kinematic chain). 7 Test methods 7.1 General test conditions 7.1.1 The average daily

35、rate is obtained by calculating the difference between two successive states divided by the number of days of observation according to the test programmes described in 7.2 and 7.3. 7.1.2 The position of the timepieces throughout all the test programmes shall be with the dial facing upwards (CH), in

36、accordance with ISO 3158. 7.1.3 In order to eliminate any residual influence of temperature in the initial ageing test, the ageing test shall be performed first followed by the temperature simulation test. 7.1.4 The number of samples from each batch should be greater than or equal to 30. The confide

37、nce interval of standard deviation requires a minimum lot size. BSISO10553:2003IS:35501 O3002(E) 4 I SO 3002 All irhgts seredevr7.2 Ageing test programme The test specified in Table 2 shall only apply to watches having an indicated accuracy included between 3 s/a and 30 s/a. Table 2 Ageing test Symb

38、ol Test conditions Stage Test Days State s Rate s/d Temperature C Relative humidity % 1 2 I Stabilization (3 days) 3 23 0,5 50 5 E V34 5 II Average daily rate (3 days) 6 V6 V3 B dB EE M t = 23 0,5 50 5 E V67 etc. III Rest (24 days) 30 23 5 50 20 31 32 IV Stabilization (3 days) 33 23 0,5 50 5 E V3334

39、 35 V Average daily rate (3 days) 36 V36 V33 M dM EE M t =23 0,5 50 5 E V3637 etc. VI Rest (24 days) 60 23 5 50 20 61 62 VII Stabilization (3 days) 63 23 0,5 50 5 E V6364 65 66 VIII Average daily rate (3 days) E V66V66 V63 E dE EE M t =23 0,5 50 5 NOTE t drepresents the period between the measuremen

40、ts of two states, equivalent to about 3 days; it is rounded to the nearest 1/1440 thof a day. The following measurements shall be taken if the actual temperature variations during stages II, V and VIII influence the ageing measurements. a) Measure the temperature characteristics of the watch at 23 C

41、. b) Correct the daily rates measured during stages II, V and VIII on the basis of actual temperatures and temperature characteristics given in Table 2 for each phase. BSISO10553:2003IS:35501 O3002(E) I SO 3002 All irhgts seredevr 57.3 Temperature simulation test programme The temperature simulation

42、 test programme is given in Table 3. The temperature gradient shall be greater than 0,5 C per minute. Table 3 Temperature simulation test Symbol Test conditions Stage Test Days State s Rate s/d Temperature C Relative humidity % I Stabilization (1 day) 1 25 0,5 E T12 3 II Simulation (3 days) 4 T4 T1

43、P dP E E M t = 25 0,5 E T45 6 III Simulation (3 days) 7 T7 T4 S dS EE M t = 35 0,5 E T78 9 IV Simulation (3 days) 10 T10 T7 A dA EE M t = 25 0,5 E T1011 12 13 V Simulation (3 days) E T13T13 T10 W dW EE M t = 15 0,5 u 60 NOTE t drepresents the period between the measurements of two states, equivalent

44、 to about 3 days; it is rounded to the nearest 1/1440 thof a day. 7.4 Uncertainty of measurement The methods used for the measurement of state shall satisfy the following criteria concerning an uncertainty of measurement as specified in Table 4. Table 4 Criteria for uncertainty of measurement Accura

45、cy classification indicated Monthly accuracy s/d Annual accuracy s/d 10 2 10 3BSISO10553:2003IS:35501 O3002(E) 6 I SO 3002 All irhgts seredevr8 Calculation of accuracy 8.1 General The accuracy calculated shall be expressed in terms of monthly rates (monthly difference) or annual rates (annual differ

46、ence). The units are seconds per month (s/m) or seconds per year (s/a). A month shall be taken as 30 days, and a year as 360 days. 8.2 Calculation of the effect of ageing on accuracy For |M E M B | 5 10 3s/d, V Vshall be considered as equal to 0 s. a (d 1 ) shall be calculated using the following eq

47、uation: MB EB ln(1 30 ) ln(1 60 ) MM a MMa + = +(1) See Annex B for an alternative definition of the coefficient value a. c (s/d) shall be calculated using the following equation: EB ln(1 60 ) MM c a = +(2) See Annex B for an alternative definition of the coefficient value c. V V(s) shall be calcula

48、ted using the following equation: 360 V 0 ln(1 ) V c at dt =+ (3) The effect of seasonal changes in temperature on accuracy, V T(s), shall be calculated using the following equation: PSAw T 360 4 MMMM V + = (4) The monthly rate, M m(s/m) (monthly accuracy), shall be calculated using the following eq

49、uation: mT /12 MV = (5) The annual rate, M y(s/a), (annual accuracy), shall be calculated using the following equation: yVT M VV =+ (6) BSISO10553:2003IS:35501 O3002(E) I SO 3002 All irhgts seredevr 79 Relationship between the calculated accuracy and the accuracy classification indicated The relationship between the calculated accuracy and the accura