Acoustic Glossary


 

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


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


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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