【正文】 ished as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: . Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: . Information regarding online access to British Standards via British Standards Online can be found at Further information about BSI is available on the BSI website at Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, an d size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright amp。 如果買家 需要 PDF 格式的本標(biāo)準(zhǔn)，可以 提供郵箱給我（前提 是購買了本標(biāo)準(zhǔn)） ，我免費(fèi)發(fā)送到你的郵箱。 。 e) value of Fr and the date on which it was determined。 b) plete identification of the surface tested, a statement of the manufacturer39。 0,25) mm above the forcemeasuring assembly. Allow the weight to fall onto the forcemeasuring assembly. Record the peak force applied to the surface in the course of the impact. Within 5 s of the impact, lift and reattach the impact weight to its support mechanism so that the surface can recover before the following impact. Unless otherwise specified, repeat the procedure in twice at intervals of (60 177。 0,5 dB of the expected response, calculated on the basis of the Butterworth function. EN 14808:2020 (E) 8 Licensed copy: The University of Hong Kong, The University of Hong Kong, Version correct as of 14/03/2020 06 BSI The system should be able to record the peak value of single forcepulse signals of 10 ms duration with an uncertainty of no greater than 177。 0,1) mm and a minimum thickness of 10 mm. Metal guiding tube having an internal diameter of (71,0 177。 0,1) kg with a hardened striking surface guided so that it is allowed to fall smoothly and vertically with minimum friction. Spiral spring, having a diameter of (69 177。 R NOR M UNG Management Centre: rue de Stassart, 36 B1050 Brussels 169。den Bestimmung des Kraftabbaus This European Standard was approved by CEN on 28 November 2020. CEN members are bound to ply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up todate lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T 201。ENNE EUROP196。Licensed copy: The University of Hong Kong, The