GB/T 3785.1-2023Electroacoustics - Sound level meters - Part 1: Specifications (English PDF)

1 Scope

This document gives the electroacoustic performance specifications for the following three types of acoustic measuring instruments:

--- Time-weighted sound level meters for measuring exponential time-weighted and frequency-weighted sound levels;

--- Integral average sound level meter for measuring time-averaged and frequency-weighted sound levels;

--- Integrating sound level meter for measuring frequency-weighted sound exposure level:

Sound level meters complying with the requirements of this document, when the sound is incident on the microphone from a main direction in a free sound field or continuously from random directions , it should have the specified frequency response:

The sound level meter specified in this document is used to measure sound in the range of normal hearing of the human ear:

Note: The AU frequency weighting specified in IEC 61012 can be used to measure the A-weighted sound level 1) of audible sound containing spectral component sound sources with frequencies greater than 20 kHz:

This document specifies two performance classes: Class 1 and Class 2: Typically, the specifications for Class 1 and Class 2 sound level meters have the same design goals, mainly are acceptance limits and operating temperature ranges: The acceptance limit for level 2 is greater than or equal to the acceptance limit for level 1:

This document applies to various forms of sound level meters: A sound level meter may be a hand-held instrument that itself contains a microphone and display, or it may

An instrument consisting of one or more separate components and capable of displaying a variety of sound signal levels: Sound level meters can include extended analog and digital

Signal processors, which can be separate or combined, can have multiple analog and digital outputs: Sound level meters can include pass

Use computers, recorders, printers and other necessary equipment:

The sound level meter can be designed to be operated by the operator on site, or it can be used to automatically and continuously measure the sound level without the user on site: This document is for

The specification for acoustic response applies when the operator is not present in the sound field:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document:

GB/T 17626:2-2018 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test (IEC 61000-4-2:2008,

IDT)

ISO /IEC Guide98-4:2012 Uncertainty of measurement Part 4: Application of uncertainty of measurement in conformity assessment (Un-

ISO /IEC Guide99 International Vocabulary of Metrology Basic and common concepts and related terms (VIM) [Internationalvo-

IEC 60942 Electroacoustics-Soundcalibrators

Note: GB/T 15173-2010 Electroacoustic calibrator (IEC 60942:2003, IDT)

1) IEC 61012, Filters for the measurement of audible sound in the presence of ultrasound:

IEC 61000-6-2:2005 Electromagnetic Compatibility (EMC) Part 6-2: Generic Standards for Immunity in Industrial Environments [Electro-

Note: GB/T 17799:2-2003 Electromagnetic Compatibility General Standard Immunity Test in Industrial Environment (IEC 61000-6-2:1999, IDT)

GB/T 3222.1 | GB/T 3222.2 | GB/T 4854.7 | GB/T 3785.2 | GB/T 3785.3 | GB/T 3768 | […]