U : Sound and Vibration Definitions, Terms, Units, Measurements etc., ..
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Ultrasound Definition IEC 801-21-04, acoustic oscillation 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
Under-range the input to the sound level meter is too low for the current measurement range. Change the range.
Under-range % percentage of time an under range occurred
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