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ic tester

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  1. [1]
    الصورة الرمزية محي عبدالوارث
    محي عبدالوارث
    محي عبدالوارث غير متواجد حالياً

    عضو فعال

    تاريخ التسجيل: Mar 2007
    المشاركات: 68
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    ic tester

    i want to know any information about IC tester devices and if any programs of computer can be used for the same work
    great thanks for all

  2. [2]
    ماجد عباس محمد
    ماجد عباس محمد غير متواجد حالياً
    مشرف متميز


    تاريخ التسجيل: Sep 2006
    المشاركات: 5,226

    وسام مشرف متميز

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    IC tester are 2 types
    1- Signature type,this type measur VI characteristics of each pin and save it, then compares it to the faulty board, the chip that have different VI are faulty
    2- Function testers , this type execute the function of the chip, if there is a step that did not give the correct output, the chip is faulty
    the first type has a lot of problems since in digital IC's, the input protection circuit differs from manufactrer to another which makes the VI curve differ for good chips
    the second one needs the schematic diagram because some functions may be deliberately disabled by the designer
    no program can do this without a hardware circuit because each chip has differenf Input and output pins

    Function testers supply Board under test with power,wait half a second of so then applies test, test should finish in 25 millisecond to avoid burning IC's with what is called Back Drive, if test does not end, the tester stops with error "Time Out" else gives the test result
    long test must be devided to burists , each in 20 millisec

    0 Not allowed!



  
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