ASTM_D_1531_-_06.pdf

Designation:D 1531 06An American National StandardStandard Test Methods forRelative Permittivity(Dielectric Constant)and DissipationFactor by Fluid Displacement Procedures1This standard is issued under the fixed designation D 1531;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(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope*1.1 These test methods provide techniques for the determi-nation of the relative(Note 1)permittivity and the dissipationfactor of solid insulating materials by fluid(Note 2)displace-ment.NOTE1In common usage,the word“relative”is frequently dropped.NOTE2The word“fluid”is a commonly used synonym for“liquid”and yet a gas is also a fluid.In this standard,the word“fluid”is used toshow that liquid is not all that is meant.1.2 Test Method A is especially suited to the precisemeasurements on polyethylene sheeting at 23 C and atfrequencies between 1 kHz and 1 MHz.It may also be used atother frequencies2and temperatures to make measurements onother materials in sheet form.1.3 Test Method B is limited to the frequency range ofavailable guarded bridges.It is especially suited to measure-ments on very thin films since it does not require determinationof the thickness of the specimen yet it provides an estimate ofthe thickness of thin films that is more accurate and precisethan thickness measurements obtained by other means.1.4 Test Method B is also useful for measurements ofpolymer sheeting up to 2-mm thickness.1.5 These test methods permit calculation of the dissipationfactor of the specimens tested.1.6 The values stated in SI units are to be regarded as thestandard.1.7 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.For a specificprecautionary statement,see 7.2.2.Referenced Documents2.1 ASTM Standards:3D 150 Test Methods for AC Loss Characteristics and Per-mittivity(Dielectric Constant)of Solid Electrical Insula-tionD 374 Test Methods for Thickness of Solid Electrical Insu-lationD 831 Test Method for Gas Content of Cable and CapacitorOilsD 924 Test Method for Dissipation Factor(or Power Factor)and Relative Permittivity(Dielectric Constant)of Electri-cal Insulating LiquidsD 1711 Terminology Relating to Electrical InsulationD 6054 Practice for Conditioning Electrical Insulating Ma-terials for TestingE 1 Specification for ASTM Liquid-in-Glass Thermometers2.2 ASTM Adjuncts:Measuring cell(three drawings)43.Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology D 1711.3.2 Description of a Term Specific to This Standard:3.2.1 compatibility,nfluid is considered compatible witha test specimen if,during the time required to complete a testof the specimen in the fluid at the specified temperature andfrequency,the calculated permittivity of the specimen does notchange by more than 0.1%and the dissipation factor change isless than 0.0001.4.Summary of Test Methods4.1 TestMethodA:TheSingle-FluidTechniqueMeasurements are made with a fixed-plate,two-terminal,self-shielded test cell assembly.By two measurements,one1These test methods are under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and are the direct responsibility ofSubcommittee D09.12 on Electrical Tests.Current edition approved Oct.1,2006.Published October 2006.Originallyapproved in 1958.Last previous edition approved in 2001 as D 1531 01e1.2Coutlee,K.G.,“Liquid Displacement Test Cell for Dielectric Constant andDissipation Factor up to 100 Mc,”1959 Annual Report,Conference on ElectricalInsulation,National Research Council,Publication 756,Washington,DC.3For 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.4Available from ASTM International Headquarters.Order Adjunct No.ADJD1531.Original adjunct produced in 1961.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Copyright ASTM International Provided by IHS under license with ASTM Licensee=Occidental Chemical Corp New sub account/5910419101 Not for Resale,05/20/2007 06:41:28 MDTNo reproduction or networking permitted without license from IHS-,-,-with the cell filled with the fluid(which in this case is a liquid)only and the second one with the solid specimen immersed inthe liquid,a change in capacitance is determined.This capaci-tance differe