This SAE Recommended Practice provides procedures, and information to conduct vibration (impact) tests on lighting devices and their components as well as other safety equipment used on vehicles.
Vibration machine is designed to simulate worst case road inputs to lamps. The 2005 version of SAE J577 documented a FMVSS compatible machine that could be suitable to qualify lamps. All lamps must also pass the FMVSS requirement but technology advancements and styling progression has resulted in large lamps being used on vehicles. The larger lamp with fixture cannot be contained within the platform on the SAE J577 2005 version (Example 1). Pre re-write FMVSS requires that the fixture does not overhang the vibration machine adapter plate, which cannot be done with large lamps and the current SAE J577 machine. To update SAE J577, an example of larger vibration machine (Example 2) is given in this standard and a minimum Grms value is added to validate machine performance. The Grms value sets the minimum performance of any size vibration machine. Enlarging the vibration machine is limited by the FMVSS requirement that during calibration a force gauge must measure between 60 -70 pounds when lifting the platform over the hammer and anvil area of the machine.