ABSTRACT
The integration time, or perhaps more correctly, the reaction time of an instrument is tested using a tone burst generator. The time it takes the meter to reach a given percentage of the reference level usually defines the calibration. The meter reads both linear audio for the True Peak and k-weighted audio for the loudness measurement, resulting in Loudness Unit with reference to full scale. The loudness reading includes gating for the integrated loudness. The International Telecommunication Union (ITU) has prepared compliance material for the loudness meter, according to ITU-R BS.1770–4, 2015. The content is described in ITU-R BS.2217–2, 2016. Due to the complexity of the loudness meter, several audio files are available along with the expected reading of the meter.
