1、Designation:D6027/D6027M15Standard Practice forCalibrating Linear Displacement Transducers forGeotechnical Purposes1This standard is issued under the fixed designation D6027/D6027M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the
2、year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice outlines the procedure for calibratingdisplacement transducers and their readout systems for geo-tec
3、hnical purposes.It covers any transducer used to measuredisplacement,which gives an electrical output that is linearlyproportional to displacement.This includes linear variabledisplacement transducers(LVDTs),linear displacement trans-ducers(LDTs)and linear strain transducers(LSTs).1.2 This calibrati
4、on procedure is used to determine therelationship between output of the transducer and its readoutsystem and change in length.This relationship is used toconvert readings from the transducer readout system intoengineering units.1.3 This calibration procedure also is used to determine theaccuracy of
5、the transducer and its readout system over therange of its use to compare with the manufacturers specifica-tions for the instrument and the suitability of the instrument fora specific application.1.4 The values stated in either SI units or inch-pound unitsgiven in brackets are to be regarded separat
6、ely as the standard.The values stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combination values from the two systems may results innon-conformance with standard.1.5 All observed and calculated values shall conform to theguidelines f
7、or significant digits and rounding established inPractice D6026 unless superseded by this standard.1.5.1 The procedures used to specify how data are collected,recorded or calculated in this standard are regarded as theindustry standard.In addition they are representative of thesignificant digits tha
8、t generally should be retained.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies,or any consider-ation for the users objectives;it is common practice toincrease or reduce significant digits of reported data to becommensurate with these cons
9、ideration.It is beyond the scopeof this standard to consider significant digits used in analyticalmethods for engineering design.1.6 This practice offers a set of instructions for performingone or more specific operations.This standard cannot replaceeducation or experience and should be used in conj
10、unction withprofessional judgment.Not all aspects of this practice may beapplicable in all circumstances.This ASTM standard is notintended to represent or replace the standard of care by whichthe adequacy of a given professional service must be judged,nor should this document be applied without cons
11、ideration ofa projects many unique aspects.The word“standard”in thetitle of this document means only that the document has beenapproved through the ASTM consensus process.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of
12、 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:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD3740 Practice for Minimum Requirements for Age
13、nciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD6026 Practice for Using Significant Digits in GeotechnicalData3.Terminology3.1 DefinitionsDefinitions of terms used in this practiceare in accordance with Terminology D653.3.2 Definitions of Term
14、s Specific to This Standard:3.2.1 calibrated range,ndistance for which the transduceris calibrated.1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.95 on InformationRetrieval and Data Automation.Current edition approv
15、ed July 1,2015.Published July 2015.Originally approvedin 1996.Last previous edition approved in 2004 as D602796(2004),which waswithdrawn February 2013 and reinstated in July 2015.DOI:10.1520/D6027_D6027M-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Se
16、rvice 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 3.2.2 core,ncentral rod that moves in and out of thetransducer body.3.2.3 displacement transducer,nan electrical transducerwhich converts linear displacement to electrical output.3.2.4
