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UK Government Environmental Noise Regulations
Aircraft Noise indicators •
LAeq,16h •
Lday •
Levening.
Industrial Noise and Port Noise indicators •
LAeq,16h •
Lday •
Levening.
Railway Noise indicators •
LAeq,6h •
LAeq,16h •
LAeq,18h •
Lday •
Levening.
Road Traffic Noise indicators •
LA10,18h •
LAeq,16h •
Lday •
Levening.
See also • coupled modes
Undamped Natural Frequency Definition IEC 801-24-09, frequency of free oscillation resulting from only elastic and inertial forces of the system.
See also • natural frequency
Under-range, the input to the sound level meter is too low for the current measurement range.
Under-range %, percentage of time that an under range occurred