1、BRITISH STANDARD BS ISO 764:2002 Horology Magnetic resistant watches ICS 39.040.10 CONFIRMED APRIL 2008BS ISO 764:2002 This British Standard, having been prepared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was published under the authority of the Standar
2、ds Policy and Strategy Committee on 16 August 2002 BSI 16 August 2002 ISBN 0 580 40281 9 National foreword This British Standard reproduces verbatim ISO 764:2002 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee STI/53, Jewell
3、ery, which has the responsibility to: A list of organizations 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
4、entitled “International Standards Correspondence 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 their correct application. Com
5、pliance with a British Standard does not of itself 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 relat
6、ed international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, pages 1 to 5 and a back cover. The BSI copyright date displayed in this document indicates when the document
7、was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 764:2002(E)INTERNATIONAL STANDARD ISO 764 Third edition 2002-07-01 Horology Magnetic resistant watches Horlogerie Montres antimagntiques BSISO764:2002 ii BSISO764:2002 iiiForeword ISO (the International
8、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 a subject for which a technical committee has been esta
9、blished 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 Commission (IEC) on all matters of electrotechnical standardiza
10、tion. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. 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 votin
11、g. 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 International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying an
12、y or all such patent rights. ISO 764 was prepared by Technical Committee ISO/TC 114, Horology, Subcommittee SC 12, Antimagnetism. This third edition cancels and replaces the second edition (ISO 764:1984), which has been technically revised. Annex A forms a normative part of this International Standa
13、rd. BSISO764:2002 1Horology Magnetic resistant watches 1 Scope This International Standard specifies the minimum requirements and test methods for magnetic resistant watches. It is based on the simulation of an accidental exposure of a watch to a direct current magnetic field of 4 800 A/m. Annex A d
14、eals with watches designated as magnetic resistant with an additional indication of intensity of a magnetic field exceeding 4 800 A/m. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitutes provisions of this International Standa
15、rd. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below
16、. For undated references, the latest edition of the normative documents referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 3158:1976, Timekeeping instruments Symbolization of control positions 3 Terms and definitions For the purposes of thi
17、s International Standard, the following terms and definitions apply. 3.1 magnetic resistant watch watch designed to withstand a homogeneous and continuous magnetic field of 4 800 A/m 3.2 residual effect difference of rates observed under the conditions of test specified in this International Standar
18、d 4 Designation A watch bearing the designation “magnetic resistant” is intended for usual daily use. Its running shall not be disturbed by an accidental exposure to a direct current magnetic field of 4 800 A/m. 5 Minimum requirements 5.1 General Watches bearing the designation “magnetic resistant”
19、or any other similar term shall meet the requirements specified in 5.2 and 5.3. BSISO764:20022 5.2 Running in a magnetic field The watch shall not stop during the magnetic resistance test described in 6.3.2. For a quartz watch equipped with multiple motors, no motor shall stop during the magnetic te
20、st described in 6.3.2. 5.3 Residual effect for a mechanical watch 5.3.1 The residual effect shall not exceed 30 s per day for a watch whose movement has a casing diameter exceeding 20 mm or an area exceeding 314 mm 2 . 5.3.2 The residual effect shall not exceed 45 s per day for a watch whose movemen
21、t has a casing diameter not exceeding 20 mm or an area not exceeding 314 mm 2 . 6 Test methods 6.1 Test conditions 6.1.1 A wrist-watch shall be tested without the bracelet, unless the latter forms an integral part of the watch. 6.1.2 Throughout the test period, the ambient temperature shall be in th
22、e range of 23 C 5 C and shall not vary by more than 2 C. 6.2 Testing apparatus The testing apparatus used shall produce a homogeneous and continuous magnetic field of an intensity of 0 400 4 800 A/m (admissible variations during the test 1 %) in the three directions specified in 6.3.2. 6.3 Testing p
23、rocedure 6.3.1 Checking of the rate before the magnetic resistance test The first measurement shall be taken 1 h after maximum winding for mechanical watches. The rate shall be checked for at least 1 min in position CH, in accordance with ISO 3158. The checking is made by using an apparatus for meas
24、uring the instantaneous rate. This procedure applies only to mechanical watches. 6.3.2 Magnetic resistance test 6.3.2.1 Place the watch on the stand as intended in the test machine, in position CH. 6.3.2.2 Set the test machine in motion and check that the magnetic field has reached the required inte
25、nsity. Observe the running of the watch for 1 min, during which time it shall undergo the effect of a magnetic field according to one of the following specified axes. For quartz watches equipped with a motor having an interval of impulses of 20 s or more, observe the running of the watch during five
26、 motor runs instead of during 1 min. Reduce the intensity of the magnetic field progressively, and then stop the test machine. For mechanical watches, this procedure is carried out in three separate phases, i.e. for each direction of the magnetic field, in the following order: in the axis parallel t
27、o the surface of the watch, with the magnetic field in the direction 3 h 9 h; then in the direction 6 h 12 h; and lastly BSISO764:2002 3 in the axis perpendicular to the surface of the watch. For quartz watches, this procedure is carried out for each critical direction of the magnetic field. NOTE Th
28、e critical directions are directions for which maximum sensitivity is observed for quartz watches. Quartz watches equipped with two or more motors may have plural critical directions for each of their motors and this will be taken into account at the time of the test. 6.3.2.3 Carefully remove the wa
29、tch from the stand. 6.3.3 Checking of the rate after the magnetic resistance test The rate shall be checked for at least 1 min in position CH. The checking is made using an apparatus for measuring the instantaneous rate. This procedure applies only to mechanical watches. 6.4 Residual effect The resi
30、dual effect shall be calculated from the differences of rates observed under the conditions specified in 6.3.1 and 6.3.3. 7 Marking NOTE 1 In addition to terms used in the three official ISO languages (English, French and Russian), this International Standard gives the equivalent terms in German, Ja
31、panese and Chinese; they are published under the responsibility of the member bodies for Germany (DIN), Japan (JISC) and China (SACS). Watches meeting the minimum requirements specified in clause 5 may be marked with the following terms in each of the respective languages: in English: “magnetic resi
32、stant” in French: “antimagntique” in Russian: “ ” in German: “antimagnetisch” in Japanese: “ ” in Chinese: “ ” Equivalent terms in other languages are admissible. NOTE 2 The designation “antimagnetic” and the abbreviation “mag resist” in English may be used on the manufacturers own responsibility. B
33、SISO764:20024 Annex A (normative) Magnetic resistant watches with an additional indication A.1 General It is recognized that magnetic field environments in daily life have changed due to an increase in equipment generating strong magnetic fields. However, technical developments have made it possible
34、 for magnetic resistant watches to withstand strong magnetic fields. Consequently, watches designed to withstand strong magnetic fields shall successfully undergo the tests specified in this annex and be designated as “magnetic resistant” with an additional indication of the intensity of the magneti
35、c field to which they can resist. A.2 Designation Watches bearing the designation “magnetic resistant” with an additional indication of the intensity of the magnetic field are intended for usual daily and professional use. Their running shall not be disturbed even in a strong magnetic environment su
36、ch as, for example, in the case of close proximity with goods generating a high magnetic field. Values of additional indication of intensity of the magnetic field shall be selected at 16 000 A/m, 40 000 A/m and above. A.3 Minimum requirements Watches bearing the designation “magnetic resistant” or a
37、ny other similar term with an additional indication of the intensity of the magnetic field shall meet the requirements specified in clause 5. A.4 Test methods A.4.1 Test conditions The test conditions are specified in 6.1. A.4.2 Testing apparatus The testing apparatus used shall produce a homogeneou
38、s and continuous magnetic field in the three directions specified in 6.3.2. The intensity of the direct current magnetic field produced shall correspond to the value of additional indication (see A.2). Allowable minimum intensity shall be 92 % of the above values. Admissible variation of the intensi
39、ty of direct current magnetic field during the test shall be 1 %. A.5 Testing procedure Testing procedure is given in 6.3. BSISO764:2002 5A.6 Marking NOTE 1 In addition to terms used in the three official ISO languages (English, French and Russian), this International Standard gives the equivalent t
40、erms in German, Japanese and Chinese; they are published under the responsibility of the member bodies for Germany (DIN), Japan (JISC) and China (SACS). Watches meeting the minimum requirements specified in clause 5 may be marked with the following terms in each of the respective languages: in Engli
41、sh: “magnetic resistant XX” in French: “antimagntique XX” in Russian: “ XX” in German: “antimagnetisch XX” in Japanese: “ XX” in Chinese: “ XX” Equivalent terms in other languages are admissible. NOTE 2 The designation “antimagnetic XX” and the abbreviation “mag resist XX” in English may be used on
42、the manufacturers own responsibility. The letters XX indicate the intensity of the magnetic field, in amperes per metre, guaranteed by the manufacturer. Values of XX shall be selected in 16 000 A/m, 40 000 A/m and above. EXAMPLE magnetic resistant 16 000 A/m mag resist 40 kA/m BSISO764:2002BS ISO 76
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