U : Sound and Vibration Terms, Definitions, Units, Measurements ..
UKAS - United Kingdom Accreditation Service : is the national accreditation body recognised by government to assess, against internationally agreed standards, ...
Ultrasound IEC Definition :
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.
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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