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Ultrasound Definition IEC 801-21-04,
whose frequency is above the high-frequency limit of audible sound (about 16 kHz)
Undamped Natural Frequency
the natural frequency of a structure.
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
, 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.
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