这几天做实验,结合标准IEC68-2-1,2-78发现有几个问题:
1,关于高/低温测试,2-1Ab:描述:看这个描述,是先升温,chamber温度达到要求时,样品才能poweron,不知道大家平时怎么做的?
我看到不少厂商是把样品放进去就poweron,温度还没有达到要求。
Thespecimenisintroducedintothechamberwhichisatthetemperatureofthelaboratory.
Thetemperatureisthenadjustedtothetemperatureappropriatetothedegreeofseverity,as
specifiedintherelevantspecification.Aftertemperaturestabilityofthetestspecimenhas
beenreached,thespecimenisexposedtotheseconditionsforthespecifiedduration.
Forspecimensthatarerequiredtobeoperational(eventhoughtheydonotmeetthe
requirementsofbeingheatdissipating),powershallthenbeappliedtothespecimenanda
functionaltestisperformedasnecessary.
2.对于高温高湿测试,2-78:为了避免产品表面凝露,一般要求先升高温度,再开湿度,以避免凝露。如果我们用的是恒温恒湿箱,可能直接设定相应的温度和湿度点,就开始运行,设备可以保证是温度向上升,然后再是湿度上升吗?chamber厂商是怎么按:2-78的要求确保凝露不发生呢?
2-78:
b)Adjustthetemperatureinthechambertotheprescribedseverity,andallowthespecimen
toreachtemperaturestability.
c)Condensationcanbeavoidedduringthisperiodbynotincreasingtheabsolutehumidity.
d)Adjustthehumiditytotheprescribedseveritywithinatimeofnotmorethan2h. |