GB/T 20441.7-2025 Active National standards

GB/T 20441.7-2025 Electroacoustics—Measurement microphones—Part 7:Values for the difference between free-field and pressure sensitivity levels of laboratory standard microphones

Publish Date: 2025-05-30 Implement Date: 2025-05-30 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 20441.7-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Acoustic metrology

ICS Name: Electroacoustics

Publish Date: 2025-05-30

Implement Date: 2025-05-30

Pages: 16 pages

Scope

This document:
—— Presents a polynomial function derived from data from several laboratories using the least squares method, in order to obtain the difference between the free-field sensitivity level and the sound pressure sensitivity level of laboratory standard microphones as specified in IEC 61094-1;
—— By adding these differences to the sound pressure sensitivity level, it becomes possible to determine the free-field sensitivity level of laboratory standard microphones when they are incident into air at zero degrees;
—— Provides tabular values of the polynomial function for a range of frequencies and temperatures;
—— Allows the use of this data when it is not possible to conduct a proper free-field calibration.