Designation:F2188−02(Reapproved2011)StandardTestMethodforDeterminingtheEffectofVariableFrequencyVibrationonaMembraneSwitchorMembraneSwitchAssembly1ThisstandardisissuedunderthefixeddesignationF2188;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodestablishesproceduresfordeterminingtheeffectofsinusoidalvibration,withinthespecifiedfre-quencyrange,onswitchcontacts,mountinghardware,adheredcomponentparts,solderorheatstakes,tactiledevices,andcableorribboninterconnectsassociatedwithamembraneswitchormembraneswitchassembly.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1Definitions:2.1.1contactclosure—theeventatwhichaspecifiedresis-tanceisachievedonamembraneswitch.2.1.2criticalresonancefrequency—anypointonthespeci-menthatisobservedtohavemaximumamplitudeormorethantwicethatofthebaseinputamplitudeorsupportpoints.2.1.3membraneswitch—amomentaryswitchingdeviceinwhichatleastonecontactison,ormadeof,aflexiblesubstrate.2.1.4specifiedresistance—maximumallowablecircuitre-sistanceasmeasuredbetweentwotestpointswhoseinternalcontacts,whenheldclosed,completeacircuit.2.1.5testpoints—twopre-selectedconductivepointsinacircuitloop,possiblyincludingaswitch.3.SignificanceandUse3.1Vibrationencounteredinthefieldisnotusuallysimpleharmonic.3.2Thistestcanbeusedtodeterminerelativemotionbetweenparts,criticalfrequencies,adhesionstrengths,loosen-ingofpartsorotherphysicaleffectsthatcancausefatigueorfailure.3.3Experiencehasshownthatthistestwillexposepotentialfailuresassociatedwiththeelectroniccomponentsofamem-braneswitch,wheretestsoflowerlevelswillnot.3.4Thispractice...
