Designation:F1595−00(Reapproved2012)StandardPracticeforViewingConditionsforVisualInspectionofMembraneSwitches1ThisstandardisissuedunderthefixeddesignationF1595;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversproceduresforperformingvisualinspectionofmembraneswitches.Thisincludesvisualinspec-tionofoverlaysandcircuitry.1.2Thispracticedefineslightingparameters,distancefromeyetospecimen,viewingangle,andtheviewingtimeallowedforaspecificsizespecimen.1.3Thispracticeisonlydesignedforvisualinspectionofaestheticqualitiesofmembraneswitches.Itisnotintendedforcolormatchingorglossmeasurement.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1Definitions:2.1.1aestheticqualities—theserelatetothecosmeticap-pearanceofthemembraneswitchandincludesuchcharacter-isticsasprintingquality,uniformityoffinish,materialattri-butes,andmechanicalintegrity.2.1.1.1Discussion—Theseareoftendescribedbysuchtermsasscratches,bubbles,dents,dings,bumps,blurs,smears,voids,pinholes,etc.Thesearehighlysubjectivetermsthatdefyprecisedefinitionbutwhicharenonethelessidentifiableandmeasurable.2.1.2colormatching—procedurebywhichacoloriscom-paredtoastandardtodetermineifthetwoarevisuallyindifferentiableunderspecifiedlightingconditions.2.1.3continuousscanningmotion—viewingtechniquewherebytheinspectorviewsthewholespecimen,inthetimeallowed,withoutstoppinginanyoneareaofthepanel.2.1.4cosmeticflaws(ordefects)—seeaestheticqualities.2.1.5foot–candles—unitofilluminanceequaltoonelumenpersquarefoot.2.1.6membraneswitch—amomentaryswitchingdeviceinwhichatleastonecontactison,ormadeof,afl...
