NTi Audio says its XL2 handheld analyzer is the first handheld analyzer to provide Room Noise Criterion measurements.
A release explains: “Room Noise Criterion measurements are recommend if the ambient noise contains modulated or fluctuating noise components in the low-frequency range, such as generated by heating and venting systems (HVAC).”
Furthermore, “The handheld XL2 measures the octave-band sound pressure level to determine the applicable room noise criterion (RNC) curve in accordance with ANSI 12.2-2008. The instrument averages the acoustic spectrum every 100 ms and monitors for any low frequency fluctuation during the measurements. If the measurement results exceed the limits for nonfluctuations then the LEQ levels below 300 Hz are automatically ‘penalized.’”
NTI Americas President Tom Mintner said, “In the past consultants would derive RNC results based on a complex and iterative external spreadsheet process. The calculating power of the XL2 analyzer offers a new generation of time-saving and efficient RNC measurement … The new XL2 noise curve capability, including the RNC measurement, will be one of the most valuable advanced functions available to any professional acoustical consultant.”
The RNC feature is part of the Spectral Limits Option for firmware v2.60 and is a free download.