Question from one of my readers
If equipment is normally isolated in service, should HALT vibration testing be performed with or without isolators since the intent of this testing is to find operational and structural limits regardless of the real environment.
Answer from Steve Brenner
HALT test units should be attached to the HALT shaker WITHOUT isolators.
The purpose of the HALT vibration is to stimulate as many resonances as possible. Leaving the isolators on would “protect” the specimen from many frequencies and a lot of the energy.
Remember, we are not attempting to simulate any real service environment. We are using vibration as a “tool” to find areas in design and construction which limits long term reliability.