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GB 15742-2019

Chinese Standard: 'GB 15742-2019'
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Standard ID GB 15742-2019 (GB15742-2019)
Description (Translated English) Performance requirements and test methods of horn for motor vehicles
Sector / Industry National Standard
Classification of Chinese Standard T36
Classification of International Standard 43.040.10
Word Count Estimation 10,151
Date of Issue 2019-04-04
Date of Implementation 2020-01-01
Older Standard (superseded by this standard) GB 15742-2001
Drafting Organization Shanghai Industrial Transportation Electric Co., Ltd., Changsha Automobile Electric Apparatus Research Institute, Hubei Sanhuan Automobile Electric Co., Ltd., Harbin Gutai Electronics Co., Ltd., Zhejiang Gujiu Automobile Electric Co., Ltd., Tianjin Motorcycle Technology Center
Administrative Organization Ministry of Industry and Information Technology of the People's Republic of China
Regulation (derived from) National Standard Announcement No. 4 of 2019
Proposing organization Ministry of Industry and Information Technology of the People's Republic of China
Issuing agency(ies) State Administration of Markets and China National Standardization Administration

GB 15742-2019
ICS 43.040.10
T 36
Replacing GB 15742-2001
Performance requirements and test
methods of horn for motor vehicles
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Performance requirements and test methods ... 5 
4 Loading performance requirements and test methods ... 9 
Appendix A (Normative) Requirements of semi-anechoic chamber and open
area ... 11 
Performance requirements and test
methods of horn for motor vehicles
1 Scope
This Standard specifies the performance requirements, test methods of electric
horn and air horn for motor vehicles and loading performance requirements and
test methods of the horn.
This Standard applies to type M, N, L motor vehicles.
Note: Type L motor vehicles include type L1 and L2 mopeds.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
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 FROM the moment the horn has just been
pushed TO the sound pressure level specified in 3.1.2 shall not exceed 0.2 s.
3.1.2 Sound pressure level Under the conditions specified in, the A-weighted sound
pressure level at 2 m from the horn shall satisfy:
a) The horn for mopeds shall not be less than 90 dB(A) and not more than
115 dB(A);
The test shall be carried out in good weather. Unless otherwise specified, during
the test, the ambient temperature shall be 23 °C±5 °C. During the test, except the meter observer, other personnel shall not
stay near the horn and the microphone. When observing the meter, the pointer
swing which is independent of the sound pressure level being measured shall
be ignored.
3.2.2 Test instruments The sound pressure level shall be measured using a sound level meter
which meets the first-class accuracy specified in GB/T 3785.1. During the
measurement, the fast time constant “F” shall be used. The total sound
pressure level is measured using the “A” metering gear. The reference sound
pressure is 20 μPa. The spectrum of the sound is obtained using Fourier transform of the
sound signal. It is allowed to, according to GB/T 3241, adopt 1/3 octave-band
filters. For the sound pressure level at the center frequency of 2500 Hz, it shall
be obtained by the mean square value of the sound pressure of 1/3 of the center
frequencies of 2000 Hz, 2500 Hz, and 3150 Hz; usually USE only the Fourier
transform. The accuracy of electrical measuring meter is class 0.5.
3.2.3 Test conditions The test conditions for the electric horn are:
a) For the nominal voltage of 6 V, 12 V, 24 V, the test voltage is measured
from the output of the power supply. TAKE 6.5 V±0.1 V, 13 V±0.1 V, 26
V±0.2 V, respectively;
b) If the rectifier power supply is used for testing, when the horn is working,
the voltage AC component measured from the supply terminal shall be no
more than 0.1 V (peak/peak value);
c) The wiring resistance including the joint and the contact resistance is:
Nominal voltage 6 V: Resistance value≤0.05 Ω;
Nominal voltage 12 V: Resistance value≤0.10 Ω;
Nominal voltage 24 V: Resistance value≤0.20 Ω. Pneumatic and electro-pneumatic horns shall be operated at the air
pressure or voltage specified by the manufacturer.
4 Loading performance requirements and test methods
4.1 Performance requirements
4.1.1 The horn installed on motor vehicles shall comply with the performance
requirements and test methods of the horn of Clause 3.
4.1.2 The horn shall be mounted in the front of motor vehicles. Its sound
pressure level shall satisfy:
a) For mopeds, it shall be no less than 75 dB(A) and no more than 112 dB(A);
b) For motorcycles with a power not greater than 7 kW, it shall be no less
than 83 dB(A) and no more than 112 dB(A);
c) For type M and N automobiles and motorcycles with a power greater than
7 kW, it shall be no less than 87 dB(A) and no more than 112 dB(A).
4.2 Test methods
4.2.1 Test environment and test instruments
The test environment and test instruments shall comply with the relevant
provisions of 3.2.
4.2.2 Installation of the instruments
The microphone of the measuring instrument shall be placed close to the
longitudinal plane of the center of the vehicle. The effects of the following factors
on the measurement results shall be consi......
Related standard:   GB/T 19951-2019  GB/T 28046.2-2019
Related PDF sample:   GB 15742-2001
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