The combined vibration test is designed to test vibration together with temperature cycles or temperature and humidity at the same time. This is widely adopted in the automotive market. Differing from consumer electronic products’ use at comfortable residential or office environment, automotive electronics are most likely subject to high temperatures from the running car engine and heavy shocks during driving. Together these two conditions mandate a much harder test environment. In addition, the service life of automotive electronics may need to be as long as 15 years. To protect driver and passenger safety these tests may last days or even months. That is, a test environment that is completely different from that required for consumer products.