1、CENELEC EN*b*Db8-2- 70 96 = 3404583 0178648 522 BRITISH STANDARD BS EN 1996 1995 60068-2-70 EC 68-2-70 : Environmental testing Part 2. Tests Test Xb. Abrasion of markings and letterings caused by rubbing of fingers and hands * * lo The European Standard EN 60068-2-70 : 1996 has the status of a Briti
2、sh Standard This Part should be read in conjunction with BS EN 600681 : 1995 Genmul und guidurtxe ICs 19.040 NO COPING WITHOUT ES1 PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW -z- - CENELEC EN*bO*Ob-2- 70 96 3404503 OL7649 469 Amd.No. Date BS EN 60068-2-70 : 1996 Text affected Committees responsi
3、ble for this British Standard The preparation of this British Standard was entrusted to Technical Committee GEU50, Environmental testing of electrotechnical products, upon which the foliowing bodies were represented: Federation of the Eleckonics Industry GAMBICA (BEAMA Ltd.) Ministry of Defence Soci
4、ety of Motor Manufacturers and lladers Limited This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 September 1996 O BSI 1996 The following BSI references relate to t
5、he vork on this standard Committee reference GEU50 Draft fx i0rr.m-nt 92/0519 DC ISBN O 580 26159 X BS EN 60068-2-70 : 1996 Contents page Committees responsible inside front cover National foreword ii Foreword 2 Text of EN 600682-70 3 O BS1 1996 i _ - CENELEC EN*b0*068-2- 70 Yb = 3404583 O178b5L 017
6、 = 1 BS EN 60068-2-70 : 1996 National foreword This British Standard has been prepared by Technical Committee GEL60 and is the English language version of EN 60068-2-70 : 1996 Environmental testing -Part 2: Tests - Wt Xb: Abraswn of markings and letterings caused by rubbing of fingers and hands publ
7、ished by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 68-2-70 : 1995 published by the International Electsotechnical Commission (IEC). Cross-reference EN 600681 : 1994 (IEC 681 : 198) Publication referred to Corresponding British Standard BS EN 6006
8、8 Environmental testing BS EN 60068-12) 1995 General arnd guidunce Compliance with a British Standard does not of itself confer immunity from legal obligations. 1 Undated in the text. 2, BS EN 60068-1 : 1995 includes the corrigendum October 1988 and Al : 1993 to IEC 68-1. ii O ES1 1996 CENELEC EN*b0
9、*068-2- 70 96 3404583 0178652 T53 E EUROPW STANDARD NORME EUROPENNE EUROPrnCHE NORM EN 606W-70 January 1996 ICs 19.040 Descriptors: Environmental testing, abrasion of marking, abrasion of letterings, rubbing of fingers and hands, test apparatus, test fabric, tkst liquid English version Enviromental
10、testing Part 2: Tests Test Xb: Abrasion of markings and letterings caused by rubbing of fingers and hands (IEC 68-2-70 : 1995) Essais denvironnement Umweltprfungen Partie 2: Essais Teil 2: Prufungen Essai Xb: Effacement des marquages et Prfung Xb: pnifung der Bestndigkeit von inscriptions par fricti
11、on des doigts et des mains Kennzeichnungen und Aufschriften gegen Abrieb, (GEI 68-2-70 1995) verursacht durch Wischen mit Fingern und Hnden (IEC 68-2-70 : 1995) This European Standard was approved by CENELEC on 1995-11-28. CENELEC members are bound to comply with the CENRENELEC internal Regulations
12、which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This Europ
13、ean Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are t
14、he national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de
15、Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels O 1996 Copyright reserved to CENELEC members Ref. No. EN 600682-70 : 1996 E CENELEC EN*b0*068-2- 70 96 3404583 0378653 99T W Page 2 EN 60068-2-70 : 1996 Foreword T
16、he text of document 50/359/DIS, future edition 1 of IEC 68-2-70, prepared by TC 50, Environmental testing, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 600682-70 on The following dates were fixed 199511-28. - latest date by which the EN has to be implemented at na
17、tional level by publication of an identical national standard or by latest date by which the national standards conflicting with the EN have to be withdrawn endorsement (dop) 199609-01 - (dow) 199609-01 Annexes designated normative are part of the body of the standard. Annexes designated informative
18、 are given for information only. In this standard, annex ZA is normative and annex A is informative. Annex ZA has been added by CENELEC. Contents Introduction 1 Scope 2 Normative reference 3 General description 4 4.1 Test apparatus 4.2 Test fabric 4.3 Test liquids 5 Severity 6 Preconditioning 7 Init
19、ial measurements 8 Testing 9 Intermediate measurements 10 Recovery 11 Final measurements 12 Information to be given in the relevant specification Annexes A Schematic drawing of a test apparatus for test Xb ZA (normative) Normative references to international publications with their corresponding Eur
20、opean publications Description of the test apparatus Page 3 4 4 4 4 4 5 6 6 7 7 7 7 7 7 8 9 10 O BSI 1996 CENELEC EN*b0*0b8-2- 70 76 3404583 01i78654 826 Page 3 EN 60068-2-70 : 1996 INTRODUCTION This standard describes a method of test applicable to markings and lettering on such parts of electrical
21、 products (switches, plugs, handles etc.) which in service are subjected to rubbing forces caused by the fingers or other parts of the hand. This standard may be applied to other industrial products. * * JY This test should be required by the relevant specification when the stress during normal use
22、is very high or in such cases where the legibility is important because of safety aspects or other reasons. I CENELEC EN*b0*068-2- 70 9b 3404583 0178655 7b2 I 1 Page 4 1 EN 60068-2-70 : 1996 ENVIRONMENTAL TESTING - Part 2: Tests - Test Xb: Abrasion of markings and letterings caused by rubbing of fin
23、gers and hands . 1 Scope This International standard provides a standard method to determine the resistance of markings and letterings on flat or curved surfaces against abrasion as may occur for example by manually operating actuators and keyboards. The method is also suitable to test the resistanc
24、e against fluid contamination as may occur under normal use. 2 Nomatlve reference The following normative document contains provisions which, through reference in this text, constitute provisions of this part of IEC 68. At the time of publication, the edition Indicated was valid. All normative docum
25、ents are subject to revision, and parties to agree- ments based on this part of IEC 68 are encouraged to investigate the possibility of applying the most recent editions of the normative document indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. I
26、EC 68-1 : 1988, Envimnmental testing - Part i: General and guidance Amendment 1 (1992) 3 General description The surface under test shall be repeatedly stressed by the rubbing movement of a test piston. lhe tip of the test piston due to its elasticity is deformed in such a way as to fit the surface
27、under test. The material, hardness and shape of the piston, the movement and the angle of action are chosen in such a way that the pressure and friction executed by a human finger or by the ball of a thumb are simulated. To obtain reproducible conditions of friction a piece of fabric is placed betwe
28、en the piston and the surface under test (either as a cover of the piston or as a curtain, hanging between piston and surface). Depending on the relevant specification this fabric may either be dry (dry test) or soaked with a specified test liquid if the test is intended to cover the influence of fl
29、uid contamination as may occur in normal use (wet test). 4 Descrlptlon of the test apparatus 4.1 Test apparatus An example of a suitable test apparatus is shown in the schematic drawing in annex A. I - CENELEC EN*bO*Ob8-2- 70 96 3404583 0378656 bT9 W Page 5 EN 60068-2-70 : 1996 The apparatus moves t
30、he rubbing-piston under an angle of 45O f 5“ via a connecting rod against the surface under test. The force F (given in the relevant specification) results in an elastic deformation of the test piston combined with a rubbing movement s across the surface under test. The rubbing movement shall be fro
31、m 1 mm to 4 mm. The pressing cycle shall be repeated as many times as prescribed by the relevant speci- f ication. For non-rigid test specimens (for example keyboards) the specification shall specify additional requirements (for example fixing). The test piston consists of elastic material which sha
32、ll be inert against the test liquids and shall have a Shore-A-hardness of 47 f 5 (for example synthetic rubber). The size of the test piston shall be selected from table 1 according to the shape and dimension of the test specimen and the kind of lettering. Table 1 f I I Dimensions 1 L I I 1 I I The
33、relevant specification shall prescribe the size of the test piston. If necessary other dimensions for the test piston more suited to the test specimen may be chosen. They shall then be prescribed by the relevant specification. The abrasive dust produced during the test shall not influence the result
34、 of the test. There- fore it shall be removed continuously from the area between the test piston and the test specimen. NOTE - The accumulation of abrasive dust can be avoided by mounting the test surface vertically (the dust will fall down) or by blowing it off by means of compressed air free of oi
35、l and any pollution at room temperature. 4.2 Test fabric Between the test specimen and the test piston there shall be an easily replaceable piece of fabric which also can be a cover for the test piston. CENELEC EN*b0*068-2- 70 9b 3404583 0178657 535 Page 6 EN 60068-2-70 : 1996 lhe specifications of
36、the test fabric shall be: material: wool warp: weft: weight per area: 2195 gim2 175 threads/dm i 1 O threads/dm 135 threadsldm i 8 threadsldm For the “dry test“ the fabric shall be changed or moved such as to bring an unused part of it into contact with the test specimen after a maximum of 10 O00 cy
37、cles in order to avoid wear. For the “wet test“ (see 4.3) the soaking of the fabric shall be repeated after every 10 cycles. Alternatively it may be moved so that a fresh piece of fabric is brought in between the test piston and the test specimen after every 10 cycles. The soaking may be achieved by
38、 dipping the fabric into the test liquid or by periodic dripping of the test liquid on to the fabric. At the start of a new test and after a maximum of 10 O00 cycles the fabric shall be renewed to avoid stray results due to encrustation and wear. 4.3 Test liquids When a “wet test“ is specified in th
39、e relevant specification the test liquid(s) shall be specified. Such liquids may be: - artificial sweat; - lubricating oil; - hydraulic oil; - other relevant liquid. If more than one test liquid is specified different specimens shall be used for each liquid unless otherwise specified by the relevant
40、 specification. 5 Severity The severity is given by the force with which the test piston acts on the specimen and by the number of cycles. It shall be chosen from the following values. The chosen values shall be prescribed in the relevant specification. Force: 1 N f 0,2 N: 5 N f 1 N: 10 N f 2 N: 50
41、N f 10 N: 100 N f 20 N. According to ISOICD 12947-1, Textiles - Determination of abrasion resistance of fabrics - Martindale method - Part I: Martindale abrasion testing mschine. CENELEC EN*b0*068-2- 70 7b 3404583 0178658 471 Page 7 EN 60068-2-70 : 1996 6 Precondltlonlng The surface under test shall
42、 be in the condition of delivery after normal production. The relevant specification may prescribe preconditioning (for example ageing, dusting, cleaning). 7 initiai measurements The specimen shall be submitted to a visual check and if prescribed by the relevant specifi- cation to dimensional and fu
43、nctional checks. 8 Testlng Unless otherwise specified in the relevant specification the test shall be a “dry test“ carried out at standard atmospheric conditions according to IEC 68-1. The test specimens are stressed in the test apparatus (see clause 4.1) with the prescribed severity. The test pisto
44、n shall be moved with a speed of 60 mm/s towards the test surface. It is pressed against the surface with the force given for the chosen severity. The test conditions shall be chosen so that the “piston pressing on the surface“ and “piston lifted“ times are approximately equal. lhe time during which
45、 the force is applied shall be not less than 0,2 s. lhe cycle frequency shall be (2 f 0,5) strokes per second. The relevant specification may prescribe other frequencies. NOTE - With higher frequencies it is possible that the temperature of the test specimen is unacceptably increased. 9 Intermediate
46、 measurements Intermediate measurements may be required by the relevant specification. 10 Recovery Recovery may be required by the relevant specification. 11 Flnal measurements The specimen shall be submitted to a visual check and if prescribed by the relevant specifi- cation to dimensional and func
47、tional checks. The relevant specification shall provide the criteria upon which the acceptance or rejection of the specimen is to be based. Page 8 EN 60068-2-70 : 1996 12 Information to be glven In the relevant speclflcatlon When this test is included in a relevant specification, the following detai
48、ls shall be given, in so far as they are applicable. The relevant specification shall supply information as required in the clauses listed below, paying particular attention to the items marked with an asterisk as this information is always required. clauselsubdause a) Dimension of the test piston b
49、) Additional requirements for non-rigid test specimens . e) If the test is to be wet d) Test liquid(s) if a wet test is specified e) If more than one liquid, the number and distribution of test samples 9 Severities (force and number of cycles) g) Precondttioning h) Initial measurements . j) Test conditions if not standard atmospheric k) Cycle frequency if not two strokes per second 9 Intermediate measurements m) Recovery afterte . n) Final measurements 4.1 4.1 4.2 4.3 4.3 5 6 7 8 8 9 10 11 CENELEC EN*b0*
