Hi Everyone,

       It has been awhile for me. I have had so much work that I've had no time to take part in Technet.  So please forgive me.
       My Question :

     1)What is the equivalent of a Thermal shock cycle?
     2) How do I evaluate a failure if it fails with-in 80 cycles?
     3) How do I break down a cycle so  it would pretain to the part?

The cycle we have been told to use and evaluate our parts with is the following:

 160 cycles
At -30°C  ½ hr ® + 80°C ½ hr

If needed this is an assembled board.


As it is now I can only say it passed or it failed. I can not say how long the part will last, good or bad.

I have looked in IPC Test Method book TM-650 but could not find any thing. 
Well if any one has any thing let me know. If not I thank each and every one of you for your time. 

Have a good week end.
Nancy T.

   

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