ASTM_E_2309_-_E_2309M_-_16.pdf

Designation:E2309/E2309M16Standard Practices forVerification of Displacement Measuring Systems andDevices Used in Material Testing Machines1This standard is issued under the fixed designation E2309/E2309M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 These practices cover procedures and requirements forthe calibration and verification of displacement measuringsystems by means of standard calibration devices for static andquasi-static testing machines.This practice is not intended tobe complete purchase specifications for testing machines ordisplacement measuring systems.Displacement measuringsystems are not intended to be used for the determination ofstrain.See Practice E83.1.2 These procedures apply to the verification of the dis-placement measuring systems associated with the testingmachine,such as a scale,dial,marked or unmarked recorderchart,digital display,etc.In all cases the buyer/owner/usermust designate the displacement-measuring system(s)to beverified.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 Displacement values indicated on displays/printouts oftesting machine data systemsbe they instantaneous,delayed,stored,or retransmittedwhich are within the Classificationcriteria listed in Table 1,comply with Practices E2309/E2309M.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E83 Practice for Verification and Classification of Exten-someter Systems3.Terminology3.1 Definitions:3.1.1 accuracy,ndegree of conformity of a measure to astandard.3.1.2 error,nthe amount of deviation from a standard.3.1.2.1 DiscussionThe word“error”shall be used withnumerical values,for example,“At a displacement of+1.00 in.,the error of the displacement measuring system was+0.001in.”3.1.3 tolerance,nthe allowable deviation from a standard.3.2 Definitions of Terms Specific to This Standard:3.2.1 calibration,nin the case of displacement measuringsystems used with testing machines,the process of comparingthe displacement indication of the machine or system under testto that of a standard,making adjustments as needed to meeterror requirements.3.2.2 capacity range,nin the case of testing machines,therange of displacement for which it is designed.Some testingmachines have more than one capacity range,that is,multipleranges.3.2.3 correction,nin the case of a testing machine,thedifference obtained by subtracting the measured displacementfrom the correct value of the applied displacement.3.2.4 displacement,na movement or measurement oflength expressed in terms of millimeters,inches,etc.3.2.5 displacement measuring system,na device or set ofdevices comprised of a displacement transducer and associatedinstrumentation.1These practices are under the jurisdiction of ASTM Committee E28 onMechanical Testing and is the direct responsibility of Subcommittee E28.01 onCalibration of Mechanical Testing Machines and Apparatus.Current edition approved Jan.1,2016.Published February 2016.Originallypublished in 2005.Last previous edition approved in 2011 as E2309/E2309M-05(2011)1.DOI:10.1520/E2309_E2309M-162For 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.*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 States1 3.2.6 lower limit of verification range,nthe lowest valueof displacement at which a displacement measuring system canbe verified.3.2.7 percent error,nin the case of a displacement mea-suring system,the ratio,expressed as a percent,of the error tothe correct value of the applied displacement.3.2.7.1 DiscussionThe measured displacement,as mea-sured by the testing machine,and the applied displacement,ascomputed from the readings of the verification device,shall berecorded at each verification displacement data point.Theerror,and the percent error,shall be calculated from this data asfollows:Error5 A 2 BPercent Error5A 2 B!/B#3100where:A=displacement measured by the machine being verified,mm in.,andB=correct value of the applied displacement,mm in.,asdetermined by th