Dellortoman
Hero member
- Location
- Tasmania, Australia
I doubt that any inspection station is set up for noise level testing, so there's little point in running the engine for that purpose. Why are these guys running engines?
Having worked in acoustics and vibration in one of my past engineering jobs, I know a little about sound level measurement. If any tester wants to start your bike for a noise level measurement, ask him to show you the acoustics certification for the workshop space. Simply having a sound level meter in his hand means nothing.
For any meaningful results with a sound level meter you need either an acoustics laboratory or a flat open space with no sound reflective surfaces for hundreds of metres in any direction. Trackside or roadside measurements are also fraught with inaccuracies for similar reasons. That kind of test might tell you that one vehicle is louder than another as it passes the microphone in a fixed location, but it won't give accurate dB levels for an individual vehicle.
Having worked in acoustics and vibration in one of my past engineering jobs, I know a little about sound level measurement. If any tester wants to start your bike for a noise level measurement, ask him to show you the acoustics certification for the workshop space. Simply having a sound level meter in his hand means nothing.
For any meaningful results with a sound level meter you need either an acoustics laboratory or a flat open space with no sound reflective surfaces for hundreds of metres in any direction. Trackside or roadside measurements are also fraught with inaccuracies for similar reasons. That kind of test might tell you that one vehicle is louder than another as it passes the microphone in a fixed location, but it won't give accurate dB levels for an individual vehicle.