This second edition of NMP 011 describes the procedures for the periodic verification of time-weighted sound level meters, integrators-averagers and integrators that were designed to conform to the Class 1 or Class 2 specifications of the second edition of IEC 61672-1.
Peru – Draft Peruvian Metrological Standard PNMP 011:2025 “Electro acoustics. Sound level meters. Part 3: Periodic tests”
