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1、 Reference number ISO 10553:2003(E) ISO 2003 INTERNATIONAL 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 ISO 10553:2003(E) PDF disclaimer This PDF file may contain embedded
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6、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 2003 All rights reserved ISO 10553:2003(E) ISO 2003 All rights reserved iii Contents Page Forewordiv 1 Scope1 2 Normative references .1 3 Terms and defini
7、tions.1 4 Symbols and units 2 5 Practical factors affecting accuracy .2 5.1 General.2 5.2 Accuracy2 5.3 Influence of temperature on accuracy2 5.4 Accidents or abnormal environment 3 6 Types of measurement.3 7 Test methods.3 7.1 General test conditions3 7.2 Ageing test programme4 7.3 Temperature simu
8、lation test programme.5 7.4 Uncertainty of measurement5 8 Calculation of accuracy6 8.1 General.6 8.2 Calculation of the effect of ageing on accuracy6 9 Relationship between the calculated accuracy and the accuracy classification indicated7 10 Indication of the accuracy classification7 Annex A (norma
9、tive) Statistical evaluation of accuracy 8 Annex B (normative) Evaluation of coefficients a and c from the differences of rates11 Annex C (informative) Reliability.13 Bibliography .14 ISO 10553:2003(E) iv ISO 2003 All rights reserved Foreword ISO (the International Organization for Standardization)
10、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 a subject for which a technical committee has been established has the right to be repres
11、ented 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 Commission (IEC) on all matters of electrotechnical standardization. International Standards are
12、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 committees are circulated to the member bodies for voting. Publication as an International
13、 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 not be held responsible for identifying any or all such patent rights. ISO 10553 was prepa
14、red by Technical Committee ISO/TC 114, Horology, Subcommittee SC 11, Indication of accuracy. INTERNATIONAL STANDARD ISO 10553:2003(E) ISO 2003 All rights reserved 1 Horology Procedure for evaluating the accuracy of quartz watches 1 Scope This International Standard specifies the procedure for evalua
15、ting 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 watches having accompanying documents on which the accuracy classification is indicated. 2 Normative referen
16、ces 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 the referenced document (including any amendments) applies. ISO 3158, Timekeeping instruments Symbolizati
17、on 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 terms and definitions apply. 3.1 quartz watch with accuracy indication quartz watch, the accuracy class
18、ification of which is indicated in its accompanying documents, such as operating instructions, prospectus, labels, etc. 3.2 indicated accuracy classification accuracy in standardized measuring conditions and affected by practical factors described in Clause 5 and evaluated in accordance with the met
19、hods 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 (in view of the fact that the accuracy classification is expressed in seconds) ISO 10553:2003(E) 2 ISO 2
20、003 All rights reserved 4 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 Symbol Unit Term Ageing a d1 coefficient of the logarithmic function applied c s/d coefficient of the logarithmic function
21、applied td d time interval MB s/d average daily rate for the first three days of the ageing test (stage II) MM s/d average daily rate for the middle three days of the ageing test (stage V) ME s/d average daily rate for the last three days of the ageing test (stage VIII) VV s variation in state over
22、one year due to ageing Temperature simulation MP s/d average daily rate in simulation of spring MS s/d average daily rate in simulation of summer MA s/d average daily rate in simulation of autumn MW s/d average daily rate in simulation of winter VT s variation in state over one year due to seasonal
23、changes in temperature Accuracy Mm s/m monthly rate My s/a annual rate 5 Practical factors affecting accuracy 5.1 General The main factors affecting the operating accuracy of quartz watches are temperature and ageing. Accordingly, these two factors are taken into account when evaluating the accuracy
24、. 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 temperature variations due to the climatic conditions in the places of use. 5.3 Influence of temperature on accuracy Watches are
25、 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 temperatures simulating seasonal variations in all locations. The effects of temperature on accuracy are calculated arbit
26、rarily at levels corresponding to the average seasonal temperature in temperate climates. ISO 10553:2003(E) ISO 2003 All rights reserved 3 5.4 Accidents or abnormal environment Accidents which quartz watches may suffer such as dropping, exposure to a strong magnetic field or extremely high or low te
27、mperatures are not covered by this International Standard. 6 Types of measurement To evaluate the accuracy of quartz watches in accordance with the procedure described in Clause 7, the condition of the component which displays the seconds shall be measured (this measuring procedure has the advantage
28、 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 rate is obtained by calculating the difference between two successive states divided by the number of days of observation according t
29、o 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 accordance with ISO 3158. 7.1.3 In order to eliminate any residual influence of temperature in the initial ageing test, the ageing te
30、st 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 confidence interval of standard deviation requires a minimum lot size. ISO 10553:2003(E) 4 ISO 2003 All rights reserved 7.2 Ageing test prog
31、ramme 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 Symbol 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 EV3 4 5 II Average
32、daily rate (3 days) 6 V6V3 B dB EE M t = 23 0,5 50 5 EV6 7 etc. III Rest (24 days) 30 23 5 50 20 31 32 IV Stabilization (3 days) 33 23 0,5 50 5 EV33 34 35 V Average daily rate (3 days) 36 V36V33 M dM EE M t = 23 0,5 50 5 EV36 37 etc. VI Rest (24 days) 60 23 5 50 20 61 62 VII Stabilization (3 days) 6
33、3 23 0,5 50 5 EV63 64 65 66 VIII Average daily rate (3 days) EV66 V66V63 E dE EE M t = 23 0,5 50 5 NOTE td represents the period between the measurements of two states, equivalent to about 3 days; it is rounded to the nearest 1/1440th of a day. The following measurements shall be taken if the actual
34、 temperature variations during stages II, V and VIII influence the ageing measurements. a) Measure the temperature characteristics of the watch at 23 C. b) Correct the daily rates measured during stages II, V and VIII on the basis of actual temperatures and temperature characteristics given in Table
35、 2 for each phase. ISO 10553:2003(E) ISO 2003 All rights reserved 5 7.3 Temperature simulation test programme The temperature simulation 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 Sta
36、ge Test Days State s Rate s/d Temperature C Relative humidity % I Stabilization (1 day) 1 25 0,5 ET1 2 3 II Simulation (3 days) 4 T4T1 P dP EE M t = 25 0,5 ET4 5 6 III Simulation (3 days) 7 T7T4 S dS EE M t = 35 0,5 ET7 8 9 IV Simulation (3 days) 10 T10T7 A dA EE M t = 25 0,5 ET10 11 12 13 V Simulat
37、ion (3 days) ET13 T13T10 W dW EE M t =15 0,5 u 60 NOTE td represents the period between the measurements of two states, equivalent to about 3 days; it is rounded to the nearest 1/1440th of a day. 7.4 Uncertainty of measurement The methods used for the measurement of state shall satisfy the following
38、 criteria concerning an uncertainty of measurement as specified in Table 4. Table 4 Criteria for uncertainty of measurement Accuracy classification indicated Monthly accuracy s/d Annual accuracy s/d 102 103 ISO 10553:2003(E) 6 ISO 2003 All rights reserved 8 Calculation of accuracy 8.1 General The ac
39、curacy calculated shall be expressed in terms of monthly rates (monthly difference) or annual rates (annual difference). 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
40、 |ME MB| 5 103 s/d, VV shall be considered as equal to 0 s. a (d1) shall be calculated using the following equation: MB EB ln(130 ) ln(160 ) MMa 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(160 ) M
41、M c a = + (2) See Annex B for an alternative definition of the coefficient value c. VV (s) shall be calculated using the following equation: 360 V 0 ln(1)Vcat dt=+ (3) The effect of seasonal changes in temperature on accuracy, VT (s), shall be calculated using the following equation: PSAw T 360 4 MM
42、MM V + = (4) The monthly rate, Mm (s/m) (monthly accuracy), shall be calculated using the following equation: mT /12MV= (5) The annual rate, My (s/a), (annual accuracy), shall be calculated using the following equation: yVT MVV=+ (6) ISO 10553:2003(E) ISO 2003 All rights reserved 7 9 Relationship be
43、tween the calculated accuracy and the accuracy classification indicated The relationship between the calculated accuracy and the accuracy classification indicated as defined in Clause 10 is as follows. a) For the indication of the average monthly rate, Mm (s/m) shall be within the limits of the accu
44、racy classification indicated. b) For the indication of the average annual rate, My (s/a) shall be within the limits of the accuracy classification indicated. 10 Indication of the accuracy classification The accuracy classification shall be indicated on the basis of the values defined in Clause 9. T
45、he accuracy classification shall be indicated as x seconds per month (s/m) or as x seconds per year (s/a). The accuracy classification indication shall be chosen among the following values: 3, 5, 10, 15, 20, 30. EXAMPLES Monthly accuracy classification evaluated in accordance with ISO 10553: 15 s/m.
46、 Annual accuracy classification evaluated in accordance with ISO 10553: 20 s/a. ISO 10553:2003(E) 8 ISO 2003 All rights reserved Annex A (normative) Statistical evaluation of accuracy A.1 Field of application This Annex specifies the methods for statistical evaluation of accuracy by lot. A.2 Explana
47、tion of symbols A.2.1 Accuracy by lot The symbols and units relative to accuracy per lot are given in Table A.1. Table A.1 Accuracy by lot Symbol Unit Term V s Total variation in state over one year Am s/m Monthly accuracy for the lot Ay s/a Annual accuracy for the lot A.2.2 Average values and stand
48、ard deviations of VT(i) and VV(i) The symbols and units relative to average values and standard deviations of VT(i) and VV(i) are given below. The average value of VT(i) is ( ) TT 1 1 n i i VV n = = (A.1) where i indicates the watch number; n indicates the total number of watches. The average value
49、of VV(i) is VV( ) 1 1 n i i VV n = = (A.2) The total average value is TV VVV=+ (A.3) ISO 10553:2003(E) ISO 2003 All rights reserved 9 The standard deviation of VT(i) is 2 TT( ) 1 T () 1 n i i VV s n = = (A.4) The standard deviation of VV(i) is 2 VV( ) 1 V () 1 n i i VV s n = = (A.5) The standard deviation of the total average value is 22 TV sss=+ (A.6) A.3 Test methods The test methods are s