ASTM_E_1256_-_15.pdf

Designation:E125615Standard Test Methods forRadiation Thermometers(Single Waveband Type)1This standard is issued under the fixed designation E1256;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.Scope1.1 The test methods described in these test methods can beutilized to evaluate the following six basic operational param-eters of a radiation thermometer(single waveband type):SectionCalibration Accuracy8Repeatability9Field-of-View10Response Time11Warm-Up Time12Long-Term Stability131.2 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.1.3 The term single waveband refers to radiation thermom-eters that operate in a single band of spectral radiation.Thisterm is used to differentiate single waveband radiation ther-mometers from those termed as ratio radiation thermometers,two channel radiation thermometers,two color radiationthermometers,multiwavelength radiation thermometers,mul-tichannel radiation thermometers,or multicolor radiation ther-mometers.The term single waveband does not precludewideband radiation thermometers such as those operating inthe 8 14 m band.2.Referenced Documents2.1 ASTM Standards:E2758 Guide for Selection and Use of Wideband,LowTemperature Infrared Thermometers2.2 IEC DocumentsIEC/TS 62492-1 ed 1.0 TS Industrial Process ControlDevicesRadiation ThermometersPart 1:TechnicalData for Radiation Thermometers3.Terminology3.1 Definitions:3.1.1 blackbody,nthe perfect or ideal source of thermalradiant power having a spectral distribution described by thePlanck equation.3.1.1.1 DiscussionThe term blackbody is often used todescribe a furnace or other source of radiant power whichapproximates the ideal.3.1.2 center wavelength,na wavelength,usually near themiddle of the band of radiant power over which a radiationthermometer responds,that is used to characterize its perfor-mance.3.1.2.1 DiscussionThe value of the center wavelength isusually specified by the manufacturer of the instrument.3.1.3 field-of-view,na usually circular,flat surface of ameasured object from which the radiation thermometer re-ceives radiation.2NOTE1Field-of-view traditionally has been referred to as target size.3.1.4 measuring distance,ndistance or distance rangebetween the radiation thermometer and the target(measuredobject)for which the radiation thermometer is designed.2NOTE2Measuring distance traditionally has been referred to as targetdistance.3.1.5 radiation thermometer,na radiometer calibrated toindicate the temperature of a blackbody.3.1.6 radiometer,na device for measuring radiant powerthat has an output proportional to the intensity of the inputpower.3.1.7 target distance,nsee measuring distance.3.1.8 target plane,nthe plane,perpendicular to the line ofsight of a radiation thermometer,that is in focus for thatinstrument.3.1.9 target size,nsee field-of-view.3.2 Definitions of Terms Specific to This Standard:3.2.1 reference temperature source,na source of thermalradiant power of known temperature or emissivity,or both,used in the testing of radiation thermometers.3.2.2 temperature resolution,nthe minimum simulated oractual change in target temperature that gives a usable changein output or indication,or both.1These test methods are under the jurisdiction of ASTM Committee E20 onTemperature Measurement and are the direct responsibility of Subcommittee E20.02on Radiation Thermometry.Current edition approved July 1,2015.Published July 2015.Originally approvedin 1988.Last previous edition approved in 2011 as E1256 11a.DOI:10.1520/E1256-15.2IEC 62492-1.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Significance and Use4.1 The purpose of these test methods is to establishconsensus test methods by which both manufacturers and endusers may perform tests to establish the validity of the readingsof their radiation thermometers.The test results can also serveas standard performance criteria for instrument evaluation orselection,or both.4.2 The goal is to provide test methods that are reliable andcan be performed by a sufficiently skilled end user or manu-facturer.It is hoped that it will result in a better understandingof the operation of radiation thermometers and also promoteimproved communication between the manufacturers and theend users.A user without sufficient knowledge and experienceshould seek assistance from the equipment makers or otherexpert sources,such as those found at the National Institute ofStandards and Technology in Gaithersburg,Maryland.4.3 These test methods should be used with the