GB/T 3785.1-2010 Replaced National standards

GB/T 3785.1-2010 Electroacoustics—Sound level meters—Part 1:Specifications

Publish Date: 2010-09-02 Implement Date: 2011-04-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 3785.1-2010

Standard Type: National standards

Standard Status: Replaced

is_force_gb: no

CCS Name: Acoustic metrology

ICS Name: Electroacoustics

Publish Date: 2010-09-02

Implement Date: 2011-04-01

Pages: 29 pages

Scope

1.1 This part provides specifications for the electroacoustic performance of the following three types of sound measurement instruments:
—— Conventional sound level meters for measuring index time-weighted sound levels;
—— Integral average sound level meters for measuring time-averaged sound levels;
—— Integral sound level meters for measuring sound exposure levels.
An instrument can perform any of the above three types of measurements. Maximum time-weighted sound level measurements and peak C sound level measurements are provided as additional performance requirements. All sound level meters specified in this part must have A frequency weighting.
1.2 Sound level meters that meet the requirements of this part shall have a specified frequency response when sound is incident on the microphone from a reference direction or an irregular direction in a free sound field.
1.3 The sound level meters specified in this part are used to measure sounds within the range of human hearing.
Note: To measure audible sounds in the presence of ultrasound, the AU weighting specified in IEC 61012 can be used [1]. 1)
1.4 This part specifies sound level meters divided into two performance classes: 1 class and 2 class. Generally, the specifications for 1 class and 2 class sound level meters have the same design objectives, but the tolerance limits and operating temperature ranges differ. The tolerance limits specified for 2 class meters are greater than or equal to those specified for 1 class meters.
1.5 This part 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 can be separate or combined, and may have multiple analog and digital outputs. Sound level meters may inc