HAST　英語

FeaturesReproductionofnear-constanttemperatureandhumiditytestingenvironmentwithAir-HAST(option)NormalHASTenvironmentAir-HASTenvironmentTestchamberWatersteamWater+110°C+100°CTemperatureExhaustvalveOpen(Riseinwatertemperature)AirTestchamberWatersteamWaterInternalchambertemperatureWetbulbtemperature+110°C+100°CTemperatureExhaustvalveClosed(Untiltestend)InternalchambertemperatureWetbulbtemperatureExhaustvalveOpenExhaustvalveClosedTimeTemperatureisincreasedtogeneratewatersteam,atwhichpointairinthetestareaescapesthroughtheexhaustvalve.HightemperatureHighhumidityPressureExhaustvalveClosedTimeExhaustvalveisclosedintherisingstepforpressurizationwithairstillinthechamber.(Atmosphericpressure+Watersteampressure)HightemperatureHighhumidityPressure+AirAir-HASTtemperatureandhumiditycontrolrange0.196Pressuregaugereading[MPa(G)]0.3921001100100908070Relativehumidity[%rh]120130140Chambertemperature(°C)EHS-212M/MD,222M/MDAir-HASTrange+EHS-412M/MDAir-HASTrangeAcceleratedtestingexamplesforwhiskerevaluationTemperaturecyclingtestHightemperatureandhighhumiditytestAir-HAST-40n+85°C3000cycles+55°C/85%rh+85°C/85%rh+110°C/85%rh(Airpressure130kPa)3000hours1000hours200hoursAir-HASTtemperatureandhumiditycontrolrange00.196Pressuregaugereading[MPa(G)]0.3921501606Air-HASTfunction(optionforM/MDtype)Dependingonthespecimen,notonlywatersteambutalsooxidationandotherspecimensurfaceconditionscancausefailure.Byleavingairinthetestarea,theAir-HASTfunctionaddsairtothehigh-temp,high-humidity,andpressurizedenvironmentforeffectiveacceleratedtestingofspecimensforwhichtheoxygeninairaffectsdegradation,suchaswithsurfaceoxidation.(Accelerationmaynotbeseenforsomespecimen.)Whiskerhumidity-resistanceevaluationtesting(JapanesepatentNo.5066143)Evaluationexamplesforwhiskerevaluationsofmountingboardsarelimited.Oneofthemainreasonsforthisisbecausethetestingtimecanbeaslongas1000or3000hours.Toshortenthesetestingtimes,ESPECconductslead-freesolderwhiskerevaluationofmountingboardsusingAir-HAST.Theresultsconfirmedacceleratedeffectswithtestingat85°Cand85%rhhumidity.