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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)
Uncoupled Mode under Oscillation
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
Units : SI Units
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