ASTM_E_2624_-_17.pdf

Designation:E262417Standard Practice forTorque Calibration of Testing Machines1This standard is issued under the fixed designation E2624;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice covers procedures and requirements forthe calibration of torque for static and quasi-static torquecapable testing machines.These may,or may not,have torqueindicating systems and include those devices used for thecalibration of hand torque tools.Testing machines may becalibrated by one of the three following methods or combina-tion thereof:1.1.1 Use of standard weights and lever arms.1.1.2 Use of elastic torque measuring devices.1.1.3 Use of elastic force measuring devices and lever arms.1.1.4 Any of the methods require a specific uncertainty ofmeasurement,displaying metrological traceability to The In-ternational System of Units(SI).NOTE1 for further definition of the term metrological traceability,refer to the latest revision of JCGM 200:International vocabulary ofmetrology Basic and general concepts and associated terms(VIM).1.2 The procedures of 1.1.1,1.1.2,and 1.1.3 apply to thecalibration of the torque-indicating systems associated with thetesting machine,such as a scale,dial,marked or unmarkedrecorder chart,digital display,etc.In all cases the buyer/owner/user must designate the torque-indicating system(s)to becalibrated and included in the report.1.3 Since conversion factors are not required in thispractice,either english units,metric units,or SI units can beused as the standard.1.4 Torque values indicated on displays/printouts of testingmachine data systemsbe they instantaneous,delayed,stored,or retransmittedwhich are calibrated with provisions of1.1.1,1.1.2 or 1.1.3 or a combination thereof,and are withinthe 61%of reading accuracy requirement,comply with thispractice.1.5 The following applies to all specified limits in thisstandard:For purposes of determining conformance with thesespecifications,an observed value or a calculated value shall berounded“to the nearest unit”in the last right-hand digit used inexpressing the specification limit,in accordance with therounding method of Practice E29,for Using Significant Digitsin Test Data to Determine Conformance with Specifications.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2E6 Terminology Relating to Methods of Mechanical TestingE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE74 Practice of Calibration of Force-Measuring Instrumentsfor Verifying the Force Indication of Testing MachinesE2428 Practice for Calibration and Verification of TorqueTransducers2.2 NIST Technical Notes:NIST Technical Note 1297 Guidelines for Evaluating andExpressing the Uncertainty of NIST Measurement Re-sults32.3BIPM Standard:4JCGM 200:International vocabulary of metrology Basicand general concepts and associated terms(VIM)3.Terminology3.1 Definitions:In addition to the terms listed,see Termi-nology E6.1This practice is under the jurisdiction ofASTM Committee E28 on MechanicalTesting and is the direct responsibility of Subcommittee E28.01 on Calibration ofMechanical Testing Machines and Apparatus.Current edition approved Sept.1,2017.Published November 2017.Originallyapproved in 2009.Last previous edition approved in 2015 as E262415.DOI:10.1520/E2624-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.4Available from BIPM(Bureau International des Poids et Mesures)-Pavillon deBreteuil F-92312 Svres Cedex FRANCE http:/www.bipm.org*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the