1 Scope
This Standard specifies performance requirements and test methods of direct current and compressed-air driven horns for motor vehicles, as well as horns installed in motor vehicles.
This Standard is applicable to motor vehicles of categories M, N, L3, L4 and L5.
2 Normative References
The provisions of the following standard, through reference into this Standard, constitute provisions of this Standard. When this Standard is published, the editions indicated are valid. All standards are subject to revision, and Parties concerned are encouraged to discuss the possibility of applying the latest edition(s) of the following standard(s).
IEC 651-1979 Sound Level Meters
IEC 225-1966 1/1, 1/2 and 1/3 Octave Filters for the Analysis of Sound and Vibration
3 Performance Requirements and Test Methods
3.1 Performance Requirement
3.1.1 General
The electric horn shall emit a continuous and uniform sound. For pneumatic and electro-pneumatic horns, the time lapse between the moment when the horn is actuated and the moment when the sound-pressure level prescribed in 3.1.2 is reached shall not exceed 0.2 second (s).
GB 15742-2001 引用如下标准：
* IEC 651-1979 Sound Level Meters * IEC 225-1966 1/1, 1/2 and 1/3 Octave Filters for the Analysis of Sound and Vibration
