Designation:B854−98(Reapproved2016)StandardGuideforMeasuringElectricalContactIntermittences1ThisstandardisissuedunderthefixeddesignationB854;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thetechniquesdescribedinthisguideapplytoelectri-calcircuitsthatincludeoneormoreelectricalcontactsindevicessuchassliprings,separableconnectors,electrome-chanicalrelaysorclosedswitchcontacts.Theusershoulddetermineapplicabilityforotherdevices.1.2Therangeoftechniquesdescribedapplytocircuitdiscontinuities(intermittences)ofdurationsrangingfromap-proximately10nanosecondstoseveralsecondsandofsuffi-cientmagnitudetocausealterationofthecircuitfunction.Extensionoftheguidetoshorterdurationeventsmaybepossiblewithsuitableinstrumentation.Eventsoflongerdura-tionmaybemonitoredbytechniquesfordcmeasurementssuchasthosedescribedinTestMethodsB539orbyadaptationofmethodsdescribedinthisguide.1.3Thetechniquesdescribedinthisguideapplytoelectri-calcircuitscarryingcurrentstypicalofsignalcircuits.Suchcurrentsaregenerallylessthan100ma.Extensionofthesetechniquestocircuitscarryinglargercurrentsmaybepossible,buttheusershouldevaluateapplicabilityfirst.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.ItistheresponsibilityoftheuserofthisstandardtobecomefamiliarwithallhazardsincludingthoseidentifiedintheappropriateSafetyDataSheet(SDS)forthisproduct/materialasprovidedbythemanufacturer,toestablishappropriatesafetyandhealthpractices,anddeterminetheapplicabilityofregulatorylimi-tationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B539TestMethodsforMeasuringResistanceofElectricalConnections(StaticContacts)B542TerminologyRelatingtoElectricalContactsandTheirUseB615PracticeforMeasuringElectrical...
