This standard specifies the performance requirements and test methods of electric horns and air horns for motor vehicles as well as the loading performance requirements and test methods of horns.
This standard is applicable to motor vehicles of types M, N and L.
Note: Motor vehicles of type L include mopeds of types L1 and L2.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3241 Electroacoustics - Octave-band and fractional-octave-band filters
GB/T 3785.1 Electroacoustics - Sound level meters - Part 1: Specifications
3 Performance requirements and test methods
3.1 Performance requirements
3.1.1 General requirements
The horn shall emit a continuous and uniform sound. For pneumatic and electro-pneumatic horns, the time taken, from the moment the horn is pushed to the moment the sound pressure level reaches the value specified in 3.1.2, shall not exceed 0.2 s.
3.1.2 Sound pressure level
3.1.2.1 Under the conditions specified in 3.2.3.1, the A-weighted sound pressure level at 2 m from the horn shall meet the following requirements:
a) For mopeds, it shall be no less than 90 dB(A) and no greater than 115 dB(A);
b) For horns of motorcycles with a power no greater than 7 kW, it shall be no less than 95 dB(A) and no greater than 115 dB(A);
c) For horns of vehicles of types M and N as well as motorcycles with a power of greater than 7 kW, it shall be no less than 105 dB(A) and no greater than 118 dB(A).
