lifetest (temperature) hardware specifikation

[michris]

Hi, can anyone help me finding a specification sheet, where an elektronic hardware test is described in function of temperature and humidity?

In other words, what are the temp/humidity limits (upper and lower) and the duration on which hardware should be tested in order to have reliable hardware/product?

Many thanks in advance.

Michris

 

[IRstuff]

You're asking the question backwards.

What are your requirements for reliability and under what conditions? Then, you figure what life test conditions are required. TTFN

 

[michris]

Dear IRstuff, thanks for your reply.

My produkt is an office printer. This should work between 15 and 30°C.

Ok, I can test my hardware to work from 0
°C to 50°C, but for how long ? When can you decide, the hardware has been tested long enough, it will work for 5 years without problems?

What about humidity ? Should I test my hardware under variing conditions? or static? let say at 50% humidity?I don't have a clue!

I'm just curious, if somewhere out there exist a white paper for these tests ...

So, any help/link is appriciated.

regards,
michris

 

[IRstuff]

The standard approach is to perform a minimum of 2 life tests at different temperatures and use the Arhenius relationship to determine the apparent activation energy of the failures. This then allows you to use the activation energy to determine the amount of life acceleration at any given temperature.

Additionally, your suppliers might be able to give you information about the reliability of their products. These numbers can be input into MIL-HDBK-217 reliability calculations, although there are other models that can be used such as Bellcore.

TTFN