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    QUALITY CONTROL AND ASSUR
    author：管理员   addtime：2010-07-02 17:15:54.000   hits：6603

    QUALITY CONTROL AND ASSURANCE

     
    (1) SAMPLING PLAN
    U.S.Ministry of defense MIL-STD-105D level Ⅱ(single sampling plans)
    (2) INSPECTION ITEMS AND CRITERIONS FOR JUDGEMENTS
    “Measuring Methods for Light Emitting Diodes (No.11830)”and “Light Emitting Diodes(No.11829)”
    Stipulated by ministry of economical affairs of R.O.C and by reference to Q.C.standards prevailing in prominent LED plants worldwide.
    (3) RELIABILITY TESTS
    “General Provisions for Environmental Tests of CNS-Catagorized Electronic Parts”3623-3634,5637,11233~11238,and U.S.Ministry of National Defense Mil-STD-750 Specifications.
     
     

    ITEM
    OPERATING METHOD
    THERMAL SHOCK TEST
    LED placed in a chamber (-44℃)for 20 minutes,temperature increased instaneously to +88℃ for 20 minutes.The duration of the test shall be for 10 complete cycles.
    HUMIDITY TEST
    LED placed in a humidity chamber which is maintained at 40℃,95%R.H.The duration of the test is for 96 hours.
    LIFE TEST
    LED connected to a source of power and charged with 10mA at room temperature(25℃)for1000hours.
    SOLDERABILITY TEST
    The pins of LED(16mm from body)dipped into tin which is maintained at 260℃±5℃.The duration of the test is for 5 seconds.
    VIBRATION TEST
    LED placed on a vibrator which is maintained at 10-55-10 Hz/minute.
    0.82mm amplitude.The duration of the test is for 30 minutes.
    PACKING TEST
    LED packed in a corrugated fiberboard box and fallen freely on 6 faces at a diagonal angle to the ground.The altitude of the fall will be in the range of 229-609mm considering of the packed product.

     
    THE MEASURING TERMS AFTER TEST AND FAILURE CRITERIA ARE AS FOLLOWS:

    MEASURING TERMS
    FAILURE CRITERIA
    LUMINOUS INTENSITY(Iv)
    LOWER STANDARD LIMIT ×0.5
    FORWARD VOLTAGE(V)
    UPPER STANDARD LIMIT ×1.2
    REVERSE CURRENT(IR)
    UPPER STANDARD LIMIT ×2.0