MH/T 9003-2008
Electroacoustics.Instruments for measurement of aircraft nois.Performance requirements for systems to measure one-third-octave band sound pressure levels in noise certincation of transport-category aeroplanes (English Version)
- Standard No.
- MH/T 9003-2008
- Language
- Chinese, Available in English version
- Release Date
- 2008
- Published By
- Professional Standard - Civil Aviation
- Status
- Latest
- MH/T 9003-2008
- Scope
- For the purpose of aircraft nois airworthiness certification, this standard specifies the electroacoustic performance requirements for instrument systems used to measure nois . It also recommends some methods for periodic testing of instrument systems to verify whether the performance of the equipment continues to meet the specified tolerances. Require. Generally, a nois measurement system is composed of a series of instruments, including microphones, recorders, analyzers, and output devices. The components of measurement systems in practical applications are not exactly the same, but they can all achieve the required functions in different ways. Systems can be analog or digital. The purpose of this standard is to ensure that different measurement systems have the same electroacoustic characteris ics under specified reference environmental conditions and within specified tolerance ranges. This standard does not provide methods for installing microphones or microphone windshields, nor does it provide relevant measurement and analysis procedure requirements for aircraft nois airworthiness certification. It only provides methods for obtaining the 1/3 octave frequency band averaged over a period of time. Performance specifications for sound pressure level measurement systems. Some requirements apply to the entire measurement system, including methods for recording the measured sound pressure time signal prior to analysis Some requirements apply to microphones, which are used to convert measured sound pressure signals into electrical signals. In addition, there are some requirements that only apply to the analyzer, which is used to convert the signal into a 1/3 octave band sound pressure level output. The requirements of this standard apply to instruments that measure nois generated by jet or propeller-driven transport aircraft with a maximum certified take-off weight greater than 900 kg, or by propulsion systems installed on outdoor engine test benches.
MH/T 9003-2008 Referenced Document
- GB/T 17626.2 Electromagnetic compatibility.Testing and measurement techniques.Electrostatic discharge immunity test*， 2018-06-07 Update
- GB/T 17626.3 Electromagnetic compatibility test and measurement technology Part 3: Radio frequency electromagnetic field radiation immunity test*， 2023-12-28 Update
- GB/T 20441.4 Measurement microphones. Part 4: Specifications for working standard microphones
- IEC 60942 Electroacoustics - Sound calibrators*， 2017-11-29 Update
- IEC 61094-3 ELECTROACOUSTICS – MEASUREMENT MICROPHONES – Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique (Edition 2.0)*， 2016-12-01 Update
- IEC 61260 Amendment 1 - Electroacoustics - Octave-band and fractional-octave-band filters
MH/T 9003-2008 history
- 2008 MH/T 9003-2008 Electroacoustics.Instruments for measurement of aircraft nois.Performance requirements for systems to measure one-third-octave band sound pressure levels in noise certincation of transport-category aeroplanes
