Acoustic Glossary

U : Sound and Vibration Definitions, Terms, Units, Measurements ...

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UKAS : United Kingdom Accreditation Service is the national accreditation body recognised by government to assess, against internationally agreed standards, ...

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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)

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Uncoupled Mode Definition IEC 801-24-18,

normal mode oscillating independently of other modes, see also coupled modes

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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

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Under-range the input to the sound level meter is too low for the current measurement range. Change the range.

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Under-range % percentage of time an under range occurred

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Units : SI Units

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