1、Aerospace series - Test methods for aluminium and aluminium alloy productsPart 7: Reference blocks for the calibration of measuring equipment used in the determination of electrical conductivity of wrought aluminium and aluminium alloysBS EN 20047:2017BSI Standards PublicationWB11885_BSI_StandardCov
2、s_2013_AW.indd 1 15/05/2013 15:06EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2004-7 August 2017 ICS 49.025.20 English Version Aerospace series - Test methods for aluminium and aluminium alloy products - Part 7: Reference blocks for the calibration of measuring equipment used in the determin
3、ation of electrical conductivity of wrought aluminium and aluminium alloys Srie arospatiale - Mthodes dessais applicables aux produits en aluminium et alliages daluminium - Partie 7 : Blocs de rfrence pour ltalonnage pour la dtermination de la conductivit lectrique daluminium et dalliages daluminium
4、 corroys Luft- und Raumfahrt - Prfverfahren fr Erzeugnisse aus Aluminium und Aluminiumlegierungen - Teil 7: Referenzblcke zur Eichung von Megerten zur Bestimmung der elektrischen Leitfhigkeit von gekneteten Aluminium und Aluminium-Legierungen This European Standard was approved by CEN on 14 May 2017
5、. CEN members are bound to comply 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-to-date lists and bibliographical references concerning such national standards may be obtained on
6、 application to the CEN-CENELEC Management Centre 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 CEN-CENEL
7、EC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy
8、, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centr
9、e: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2004-7:2017 ENational forewordThis British Standard is the UK implementation of EN 20047:2017.The UK participation in its preparation was ent
10、rusted to Technical Committee ACE/61/24, Light Alloys for Aerospace Purposes.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correc
11、t application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 97649 0ICS 49.025.20Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strateg
12、y Committee on 30 September 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 20047:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2004-7 August 2017 ICS 49.025.20 English Version Aerospace series - Test methods for aluminium and aluminium alloy pro
13、ducts - Part 7: Reference blocks for the calibration of measuring equipment used in the determination of electrical conductivity of wrought aluminium and aluminium alloys Srie arospatiale - Mthodes dessais applicables aux produits en aluminium et alliages daluminium - Partie 7 : Blocs de rfrence pou
14、r ltalonnage pour la dtermination de la conductivit lectrique daluminium et dalliages daluminium corroys Luft- und Raumfahrt - Prfverfahren fr Erzeugnisse aus Aluminium und Aluminiumlegierungen - Teil 7: Referenzblcke zur Eichung von Megerten zur Bestimmung der elektrischen Leitfhigkeit von geknetet
15、en Aluminium und Aluminium-Legierungen This European Standard was approved by CEN on 14 May 2017. CEN members are bound to comply 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-to
16、-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translat
17、ion under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland,
18、Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZ
19、ATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2004-7:2017 EBS EN 20047:2017EN 2004-7:2017 (
20、E) 2 Contents Page European foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Production and calibration of master reference standards 4 5 Production and calibration of secondary reference blocks 5 6 Production and calibration of operating reference blocks . 5 7 Calibration
21、 schedule 7 8 Identification 7 9 Records . 7 10 Availability 7 11 Disputes 8 Annex A (informative) National Standards Laboratories which can provide secondary reference blocks 9 BS EN 20047:2017EN 2004-7:2017 (E) 3 European foreword This document (EN 2004-7:2017) has been prepared by the Aerospace a
22、nd Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this European Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, pr
23、ior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2018, and conflicting national standards shall be withdrawn at the latest by February 2018. Attention is dr
24、awn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries a
25、re bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, P
26、ortugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 20047:2017EN 2004-7:2017 (E) 4 1 Scope This European Standard defines different types of electrical conductivity reference blocks, to be used for the calibration of eddy current conductivit
27、y measuring equipment, their method of production and calibration. It is to be used in conjunction with EN 2004-1. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only th
28、e edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2004-1, Aerospace series - Test methods for aluminium and aluminium alloy products - Part 1: Determination of electrical conductivity of wrought aluminium alloys ISO
29、10012-1, Quality assurance requirements for measuring equipment - Part 1: Metrological confirmation system for measuring equipment 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 master reference standards a set of electrical conductivity ref
30、erence standards, held by a National Standards Laboratory or an Accredited Laboratory and traceable to electrical reference standards Note 1 to entry: This set is maintained as the reference standard against which all the corresponding secondary reference blocks shall be calibrated. 3.2 secondary re
31、ference blocks sets of electrical conductivity reference blocks calibrated by a National Standards Laboratory or an Accredited Laboratory against its master reference standards using eddy current conductivity measuring equipment. Individual companies or organisations may hold sets of secondary refer
32、ence blocks Note 1 to entry: These blocks are the means by which traceability to the master reference standards is maintained. 3.3 operating reference blocks sets of electrical conductivity reference blocks prepared and calibrated by competent personnel against secondary reference blocks using eddy
33、current conductivity measuring equipment Note 1 to entry: The operating reference blocks are used for routine instrument calibration. 4 Production and calibration of master reference standards 4.1 The master reference standards shall be taken from wrought material of an appropriate electrical conduc
34、tivity, in a stable metallurgical condition and whose electrical conductivity homogeneity at the surface and through the thickness has been verified (see 4.3). The surface roughness shall not exceed a value of Ra= 1,6 m. BS EN 20047:2017EN 2004-7:2017 (E) 5 4.2 Calibration shall be carried out at a
35、temperature of 20 C 2 C, using a method which ensures traceability to electrical standards. The result shall be normalized to a temperature of 20,00 C. 4.3 All appropriate precautions shall be taken to ensure that variations of electrical conductivity (measured by an eddy current method) at the surf
36、ace of any standard do not exceed 0,05 MS/m, and that variations associated with a frequency change over a range of 10 kHz to 100 kHz do not exceed 0,05 MS/m. 5 Production and calibration of secondary reference blocks 5.1 The secondary reference blocks shall be taken from wrought material of an appr
37、opriate electrical conductivity, in a stable metallurgical condition and whose homogeneity at the surface and through the thickness has been verified. They shall preferably be taken from the same material as that used to produce the master reference standards. The surface roughness shall not exceed
38、a value of Ra= 1,6 m. 5.2 The secondary reference blocks shall consist of square or circular samples with a thickness of at least 4 mm and sides or diameter of at least 30 mm. However, the dimensions shall be large enough compared with the probe area in order to avoid edge effects. 5.3 The secondary
39、 reference blocks shall be calibrated against master reference standards using properly calibrated eddy current conductivity measuring equipment. The calibration shall be performed at 20 C 2 C using the normalized conductivity value of the master reference standards for comparison. The values shall
40、be normalized to a temperature of 20,00 C. The secondary reference blocks shall be calibrated at a frequency, within the calibrated range of the master reference standards, as required by the purchaser of these blocks (usually 60 kHz). 5.4 The secondary reference blocks shall be available as a set o
41、f at least four blocks of electrical conductivity values covering the whole range required for the calibration of operating reference blocks. Additional blocks may be required to ensure a finer coverage of some frequently used ranges. 5.5 When the secondary reference blocks are anodised for protecti
42、on (anodised layer between 10 m and 15 m on aluminium alloy blocks) the corresponding lift-off effect shall be taken into account and appropriate means devised to compensate for it when calibrating against the master reference standards. 5.6 The secondary reference blocks shall be supplied together
43、with a certificate of measurement issued by a National Standards Laboratory or an Accredited Laboratory stating the electrical conductivity values registered in MS/m, the test frequency used and the temperature at which the values have been normalized. The maximum overall uncertainty (at 95 % confid
44、ence limit) of the stated electrical conductivity values shall not exceed 0,7 %. 6 Production and calibration of operating reference blocks 6.1 To avoid undue wear on secondary reference blocks, it is recommended that sets of operating reference blocks be used for the routine calibration of conducti
45、vity measuring equipments. The surface roughness shall not exceed a value of Ra= 1,6 m. 6.2 The operating reference blocks shall normally be taken from wrought material of an appropriate electrical conductivity, in a stable metallurgical condition and whose uniformity of electrical conductivity over
46、 the surface has been verified. The material chosen shall exhibit no permanent change in electrical conductivity values as a result of storage or operating conditions. BS EN 20047:2017EN 2004-7:2017 (E) 6 They shall be of such shape, size and finish that inaccuracies due to edge-effect and lift-off
47、are avoided with the particular instrument to be calibrated. Their thickness shall be appropriate for the intended test frequency (see EN 2004-1). 6.3 The calibration of operating reference blocks shall be carried out by comparison against a set of secondary reference blocks. The calibration shall b
48、e carried out at the same frequency as that intended for routine testing (usually at a frequency of 60 kHz). 6.4 The calibration of the operating reference blocks shall be carried out using the following method: measurements shall be carried in a temperature-controlled environment at 20 C 2 C; the a
49、ctual temperature variation during this calibration shall be within 0,5 C. an eddy current, comparison type conductivity meter operating at the required frequency shall be used (see 6.3), sufficient time shall be allowed for the operating and secondary reference blocks, the eddy current conductivity meter and the probe to reach ambient temperature (unnecessary handling of the blocks shall be avoided), using the eddy current electrical conductivity meter, record the indicated values for a se
