GB/T 3785.1-2023 Electroacoustics—Sound level meters—Part 1:Specifications

Scope

This document provides the electroacoustic performance specifications for the following three types of sound measurement instruments:
—— Time-weighted sound level meters for measuring time-weighted sound levels with index time weighting and frequency weighting;
—— Integral average sound level meters for measuring time-averaged and frequency-weighted sound levels;
—— Integral sound exposure level meters for measuring frequency-weighted sound exposure levels.
Sound level meters that comply with the requirements of this document should have a specified frequency response when sound is incident on the microphone from a main direction in a free sound field or continuously from random directions.
The sound level meters specified in this document are intended for measuring sounds within the normal hearing range of the human ear.
Note: The AU frequency weighting specified in IEC 61012 can be used to measure the A-weighted sound levels of audible sounds from sound sources containing spectral components with frequencies greater than 20 kHz.
This document specifies two performance levels: 1 and 2. Generally, the specifications for Level 1 and Level 2 sound level meters have the same design objectives, but the acceptance limits and operating temperature ranges differ. The acceptance limits for Level 2 are greater than or equal to those for Level 1.
This document applies to various forms of sound level meters. Sound level meters can be handheld instruments that include a microphone and a display, or they can be composed of one or more separate components and can display multiple sound signal levels. Sound level meters may include advanced analog and digital signal processors, which may be separate or combined, and may have multiple analog and digital outputs. Sound level meters may include general-purpose computers, recorders, printers, and other necessary equipment.
Sound level meters can be designed for on-site operation by

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