1、September 2011 Translation by DIN-Sprachendienst.English price group 17No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).
2、ICS 77.040.10!$tbQ“1816346www.din.deDDIN EN ISO 376Metallic materials Calibration of force-proving instruments used for the verification ofuniaxial testing machines (ISO 376:2011)English translation of DIN EN ISO 376:2011-09Metallische Werkstoffe Kalibrierung der Kraftmessgerte fr die Prfung von Prf
3、maschinen mit einachsigerBeanspruchung (ISO 376:2011)Englische bersetzung von DIN EN ISO 376:2011-09Matriaux mtalliques talonnage des instruments de mesure de force utiliss pour la vrification des machinesdessais uniaxiaux (ISO 376:2011)Traduction anglaise de DIN EN ISO 376:2011-09SupersedesDIN EN I
4、SO 376:2005-02www.beuth.deDocument comprises 40 pagesIn case of doubt, the German-language original shall be considered authoritative.09.11 DIN EN ISO 376:2011-09 2 A comma is used as the decimal marker. Start of application The start of application of this standard is 1 September 2011. DIN EN ISO 3
5、76:2005-12 may be used in parallel until 31 December 2011. National foreword This standard has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals”, Subcommittee SC 1 “Uniaxial testing” (Secretariat: AFNOR, France) in collaboration with Technical Committee ECISS/TC 101 “Tes
6、t methods for steel (other than chemical analysis)” (Secretariat: AFNOR, France). Based on the results of the parallel voting procedure carried out in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement), ISO 376:2011 has been adopted as European Standard. Th
7、e responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-08-11 AA Werkstoffprfmaschinen. NA 062-08-11 AA recommends that force-proving instruments calibrated in accordance with this standard and use
8、d to verify materials testing machines be calibrated with reversible measurement. Annex NB contains information on common designations and abbreviations, means of presenting results, and other significant information regarding use of this standard in German-speaking countries. The DIN Standards corr
9、esponding to the International Standards referred to in this document are as follows: ISO/IEC 17025 DIN EN ISO/IEC 17025 ISO 7500-1 DIN EN ISO 7500-1 Amendments This standard differs from DIN EN ISO 376:2005-02 as follows: a) there is now a second option for performing the calibration, whereby a cre
10、ep test is necessary; b) new classification criteria have been included (see Cases A to D in Clause 8); c) C.1 on evaluating the uncertainty of calibration results is now included; d) C.2 on evaluating uncertainty during subsequent use of the machine is now included; e) the standard has been editori
11、ally revised. DIN EN ISO 376:2011-09 3 Previous editions DIN 1604: 1923-06, 1938-05 DIN 51301: 1961-09, 1986-02 DIN EN 10002-3: 1994-08 DIN EN 10002-3 Supplement 1: 1994-08 DIN EN ISO 376: 2003-01, 2005-02 Annex NA (informative) Bibliography DIN EN ISO 7500-1, Metallic materials Verification of stat
12、ic uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system DIN EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories EURAMET Calibration Guide, Uncertainty of Force Measurements, pub
13、lished by EURAMET European Association of national Metrology Institutes, obtainable from: http:/www.euramet.org/index.php?eID=tx_nawsecuredl description of the measurement cable; indicated value at the calibration signal (sensitivity); excitation voltage (including frequency, where appropriate) of t
14、he force transducer; zero signal of the force transducer. NB.9 Measurement uncertainty for various instrument classes as in DIN EN ISO 376 Table 6.1 of the EURAMET Calibration Guide gives information on typical measurement uncertainties for various instrument classes. DIN EN ISO 376:2011-09 6 This p
15、age is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 376 June 2011 ICS 77.040.10 Supersedes EN ISO 376:2004English Version Metallic materials - Calibration of force-proving instruments used for the verification of uniaxial testing machines (ISO 376:2011)Matriaux mtalli
16、ques - talonnage des instruments de mesure de force utiliss pour la vrification des machines dessais uniaxiaux (ISO 376:2011) Metallische Werkstoffe - Kalibrierung der Kraftmessgerte fr die Prfung von Prfmaschinen mit einachsiger Beanspruchung (ISO 376:2011) This European Standard was approved by CE
17、N on 4 June 2011. 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 ma
18、y 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 translation under the responsibility of a CEN member into its own language and notified
19、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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lu
20、xembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All r
21、ights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 376:2011: EContents DIN EN ISO 376:2011-09 EN ISO 376:2011 (E) Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Symbols and their designations
22、 5 5 Principle6 6 Characteristics of force-proving instruments 7 7 Calibration of the force-proving instrument .7 8 Classification of the force-proving instrument.12 9 Use of calibrated force-proving instruments14 Annex A (informative) Example of dimensions of force transducers and corresponding loa
23、ding fittings .15 Annex B (informative) Additional information22 Annex C (informative) Measurement uncertainty of the calibration and subsequent use of the force-proving instrument 25 Bibliography 34 2 Foreword This document (EN ISO 376:2011) has been prepared by Technical Committee ISO/TC 164 Mecha
24、nical testing of metals in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other than chemical analysis)” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by
25、endorsement, at the latest by December 2011, and conflicting national standards shall be withdrawn at the latest by December 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible fo
26、r identifying any or all such patent rights. This document supersedes EN ISO 376:2004. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
27、Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 376:2011 has
28、 been approved by CEN as a EN ISO 376:2011 without any modification. “”DIN EN ISO 376:2011-09 EN ISO 376:2011 (E) 3 Introduction An ISO/TC 164/SC 1 working group has developed procedures for determining the measurement uncertainty of force-proving instruments, and these procedures have been added to
29、 this fourth edition as a new annex (Annex C). In addition, this fourth edition allows the calibration to be performed in two ways: with reversible measurement for force-proving instruments which are going to be used with increasing and decreasing forces; without reversible measurement for force-pro
30、ving instruments which are going to be used only with increasing forces. In the first case, i.e. when the force-proving instrument is going to be used for reversible measurements, the calibration has to be performed with increasing and decreasing forces to determine the hysteresis of the force-provi
31、ng instrument. In this case, there is no need to perform a creep test. In the second case, i.e. when the force-proving instrument is not going to be used for reversible measurements, the calibration is performed with increasing forces only but, in addition, a creep test has to be performed. In this
32、case, there is no need to determine the hysteresis. DIN EN ISO 376:2011-09 EN ISO 376:2011 (E) 4 1 Scope This International Standard specifies a method for the calibration of force-proving instruments used for the static verification of uniaxial testing machines (e.g. tension/compression testing mac
33、hines) and describes a procedure for the classification of these instruments. This International Standard is applicable to force-proving instruments in which the force is determined by measuring the elastic deformation of a loaded member or a quantity which is proportional to it. 2 Normative referen
34、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/IEC 17025, General requirements for the c
35、ompetence of testing and calibration laboratories 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 force-proving instrument whole assembly from the force transducer through to, and including, the indicator 4 Symbols and their designations Symb
36、ols and their designations are given in Table 1. DIN EN ISO 376:2011-09 EN ISO 376:2011 (E) 5 Table 1 Symbols and their designations Symbol Unit Designation b % Relative reproducibility error with rotation b % Relative repeatability error without rotation c % Relative creep error FfN Maximum capacit
37、y of the transducer FNN Maximum calibration force fc% Relative interpolation error f0% Relative zero error if Readingaon the indicator after removal of force io Readingaon the indicator before application of force i30 Readingaon the indicator 30 s after application or removal of the maximum calibrat
38、ion force i300 Readingaon the indicator 300 s after application or removal of the maximum calibration force r N Resolution of the indicator v % Relative reversibility error of the force-proving instrument X Deflection with increasing test force Xa Computed value of deflection X Deflection with decre
39、asing test force Xmax Maximum deflection from runs 1, 3 and 5 Xmin Minimum deflection from runs 1, 3 and 5 XN Deflection corresponding to the maximum calibration force rX Average value of the deflections with rotation wrX Average value of the deflections without rotation aReading value corresponding
40、 to the deflection. 5 Principle Calibration consists of applying precisely known forces to the force transducer and recording the data from the indicator, which is considered an integral part of the force-proving instrument. When an electrical measurement is made, the indicator may be replaced by an
41、other indicator and the force-proving instrument need not be recalibrated provided the following conditions are fulfilled. a) The original and replacement indicators have calibration certificates, traceable to national standards, which give the results of calibration in terms of electrical base unit
42、s (volt, ampere). The replacement indicator shall be calibrated over a range equal to or greater than the range for which it is used with the force-proving instrument, and the resolution of the replacement indicator shall be at least equal to the resolution of the original indicator when it is used
43、with the force-proving instrument. b) The units and excitation source of the replacement indicator should be respectively of the same quantity (e.g. 5 V, 10 V) and type (e.g. AC or DC carrier frequency). c) The uncertainty of each indicator (both the original and the replacement indicators) shall no
44、t significantly influence the uncertainty of the whole force-proving instrument assembly. It is recommended that the uncertainty of the replacement indicator be no greater than 1/3 of the uncertainty of the entire system (see C.2.11). DIN EN ISO 376:2011-09 EN ISO 376:2011 (E) 6 6 Characteristics of
45、 force-proving instruments 6.1 Identification of the force-proving instrument All the elements of the force-proving instrument (including the cables for electrical connection) shall be individually and uniquely identified, e.g. by the name of the manufacturer, the model and the serial number. For th
46、e force transducer, the maximum working force shall be indicated. 6.2 Application of force The force transducer and its loading fittings shall be designed so as to ensure axial application of force, whether in tension or compression. Examples of loading fittings are given in Annex A. 6.3 Measurement
47、 of deflection Measurement of the deflection of the loaded member of the force transducer may be carried out by mechanical, electrical, optical or other means with adequate accuracy and stability. The type and the quality of the deflection measuring system determine whether the force-proving instrum
48、ent is classified only for specific calibration forces or for interpolation (see Clause 7). Generally, the use of force-proving instruments with dial gauges as a means of measuring the deflection is limited to the forces for which the instruments have been calibrated. The dial gauge, if used over a
49、long travel, may contain large localized periodic errors which produce an uncertainty too great to permit interpolation between calibration forces. The dial gauge may be used for interpolation if its periodic error has a negligible influence on the interpolation error of the force-proving instrument. 7 Calibration of the force-proving instrument 7.1 General 7.1.1 Preliminary measures Before undertaking the calibration of the force-proving instrument, ensure that this instrument is able to be calibrated. This ca
