1 Scope
This Standard specifies the measurement method of noise inside motor vehicles.
This standard applies to Type M and Type N vehicles (Type M: passenger vehicles, including cars; Type N: cargo vehicles, including tractors, cranes, etc.).
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, all the editions listed are valid. All standards are subject to revision, and all parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below.
GB/T 3241-1998 Octave-Band and Fractional-Octave-Band Filter (eqv IEC 61260:1995)
GB/T 3730.2 – 1996 Road Vehicle - Masses - Vocabulary and Codes (idt ISO 1176: 1990)
GB/T 3785-1983 Electric, Sonic Properties and Measuring Methods for Sound Level Meters
GB/T 12534 – 1990 Motor vehicles-General rules of road test method
GB/T 15089 – 1994 Classification of Power-driven Vehicles
3 Nature of Tests
3.1 Verification tests
The measurements taken are used to verify that whether the vehicle provided by the manufacturer meets the noise regulations.
The conditions prescribed for each test shall be complied with as closely as possible, but if unavoidable variations have to be made, these shall be stated in the test report.
3.2 Air tightness test checking electrical test
Measurements performed in order to check that the noise of the vehicles is still within prescribed limits, and that noticeable changes have not occurred since delivery, or between individual units of a consignment of vehicles.
Foreword I
ISO Foreword II
1 Scope
2 Normative References
3 Nature of Tests
4 Measured Quantities
5 Measuring Equipment
6 Acoustic Environment, Weather conditions, Background Noise
7 Test Road Conditions
8 Vehicle Conditions
9 Microphone Positions
10 Test Procedure
11 Test Report
Annex A (Informative) Measurement Record of Noise Inside Motor Vehicles
