GB 15742-2001 English PDF

GB 15742-2001: Automotive -- Electric horn -- Performance requirements and test methods
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GB 15742-2001
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.10
T 36
Replacing GB 15742-1995
Performance Requirements and
Test Methods of Horn for Motor Vehicles
ISSUED ON. JANUARY 10, 2001
IMPLEMENTED ON. OCTOBER 1, 2001
Issued by. The Quality and Technical Supervision Bureau of the People’s
Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Performance Requirements and Test Methods of Horn ... 5 
4 Performance Requirements and Test Methods of Horn Installed on Motor
Vehicles ... 8 
Appendix A (standard appendix) ... 10 
Foreword
All the technical content in this Standard is compulsory.
This Standard is formulated in accordance with relevant technical content in ECER 28.
1993 Approved Uniform Standards of Sound Warning Devices and Acoustic Signals
for Motor Vehicles - Series 02. The main technical content of this Standard is
equivalent to it. There are merely slight differences in the stipulation of the maximum
sound pressure level of pneumatic and electric-pneumatic horns.
This Standard merely stipulates main characteristics and test methods of adopting
various horns on motor vehicles. Other requirements that are not stipulated in this
Standards shall comply with relevant industry standards.
In comparison with GB 15742-1995, there are the following differences.
1. The name of this Standard is modified into “Performance Requirements and
Test Methods of Horn for Motor Vehicles”; the scope of application is expanded
to include electric horns, pneumatic horns and electric-pneumatic horns;
Category-L3, Category-L4 and Category-L5 motorcycles are added as
applicable motor vehicle models.
2. “Semi-anechoic chamber” is added to the test environment.
3. Performance requirements of horn for motorcycles (power > 7 kW and power ≤
7 kW) are distinguished. Performance requirements of horn for motorcycles
(power > 7 kW) are the same as automobiles.
4. Performance requirements and test methods of horn for motor vehicles, and
performance requirements and test methods of horn installed on motor vehicles
are respectively listed as 2 main parts.
Since the date of implementation, this Standard shall serve as a replacement of GB
15742-1995.
Appendix A of this Standard is standard appendix.
This Standard is proposed by the State Administration of Machinery Industry.
This Standard is summarized by National Technical Committee on Automobile
Standardization.
This Standard is mainly drafted by the following organizations. Harbin FEIBEN Auto-
electric Appliance Co., Ltd., Shanghai SIIC Transportation Electric Co., Ltd., Hubei
Auto-electric Appliance Co., Ltd., Ruian Rizheng Automobile Parts Co., Ltd.,
Guangzhou Automobile Horn Factory.
Performance Requirements and
Test Methods of Horn for Motor Vehicles
1 Scope
This Standard specifies performance requirements and test methods of horn for direct
current-driven and compressed air-driven motor vehicles; performance requirements
and test methods of horn installed on motor vehicles.
This Standard is applicable to Category-M, Category-N, Category-L3, Category-L4 and
Category-L5 motor vehicles.
2 Normative References
The clauses that are included in the following standards constitute the clauses of this
Standard through reference. When this Standard is published, all the released versions
are valid. All the standards will be revised. All parties adopting this Standard shall study
the possibility of adopting the newest version of the following standards.
IEC 651-1979 Sound Level Meter
IEC 225-1966 1/1 Frequency Interval, 1/2 Frequency Interval and 1/3 Frequency
Interval Bandpass Filter for Sound and Vibration Analysis
3 Performance Requirements and Test Methods of
Horn
3.1 Performance Requirements
3.1.1 General requirements
Horn shall send out successive and uniform sound. In terms of pneumatic and electric-
pneumatic horn, the duration from the moment, when the horn is pushed to the moment
when sound pressure level reaches the value stipulated in 3.1.2, shall not be more
than 0.2 s.
3.1.2 Sound pressure level
3.1.2.1 Under the conditions stipulated in 3.2.3.1, A-weighted sound pressure level at
a distance of 2 m from the horn shall not exceed the following numerical values.
a) 115 dB(A). horn for motorcycles (power ≤ 7 kW);
3.2.2.1 The test of sound pressure level shall adopt sound pressure meter (Level-1
accuracy) that is stipulated in IEC 651. The test of sound pressure level shall adopt
fast time constant “F”; the test of total sound pressure level shall adopt “A” metering
gear; the benchmark sound pressure shall be 20 μPa.
3.2.2.2 The frequency spectrum of sound shall be obtained through Fourier transform
of acoustical signal. 1/3 frequency interval bandpass filter can be adopted in
accordance with the stipulation in IEC 225. In terms of sound pressure level (center
frequency. 2,500 Hz), it can be obtained through the mean square value of sound
pressure of 1/3 center frequency 2,000 Hz, 2,500 Hz and 3,150 Hz. Generally speaking,
only Fourier transform shall be adopted.
3.2.2.3 The accuracy of electrical test instrument is Level-0.5.
3.2.3 Test Conditions
3.2.3.1 In terms of direct current-driven horn.
a) In accordance with nominal voltage 6 V, 12 V and 24 V, test voltage shall be 6.5
V, 13 V and 26 V. Test voltage shall be tested through the power output end.
b) If rectified current is adopted in the test, the voltage alternating component
tested on the power terminal when the horn is working shall not be more than
0.1 V (peak/peak value).
c) Wiring resistance that includes connector and contact resistance is as follows.
Nominal voltage 6 V. 0.05 Ω;
Nominal voltage 12 V. 0.10 Ω;
Nominal voltage 24 V. 0.20 Ω.
3.2.3.2 In terms of pneumatic and electric-pneumatic horns, the test shall be conducted
under the air pressure condition or voltage condition stipulated by manufacturers.
3.2.4 Horn installation in test
3.2.4.1 Horn shall be firmly installed on a metal base frame in accordance with the
mode of installation stipulated by manufacturers. The mass of the base frame shall be
at least 10 times of the horn and not less than 30 kg.
3.2.4.2 Horn shall be maintained at the same height as the microphone; the height
must be between 1.15 m ~ 1.25 m. The central line of the maximum sensitivity of the
microphone shall coincide with the direction of the highest sound pressure level of the
horn.
3.2.4.3 The distance between the microphone diaphragm and the sound exit plane
than 83 dB(A) and not more than 112 dB(A);
b) In terms of Category-M and Category-N automobiles, motorcycles (power > 7
kW), sound pressure level shall be not less than 93 dB(A) and not more than
112 dB(A);
4.2 Test Methods
4.2.1 Test conditions and instruments shall comply with relevant stipulations in 3.2.
4.2.2 Instrument installation
The microphone of test instruments shall be placed in a place near the vertical plane
of motor vehicles; the maximum sound pressure level shall be tested at a distance of
0.5 m ~ 1.5 m from the ground. The influence of the following factors on the test result
shall be considered.
a) Fixing components that facilitate the installation of the horn on motor vehicles;
b) The position of the horn on motor vehicles;
c) The rigidity of the horn-installing support;
d) The shape and materials of the frontal structure of motor vehicles that might
exert influence on the sound pressure level of the horn and have shielding
effect.
4.2.3 Sound pressure level test
The test of sound pressure level shall be conducted at a distance of 7 m in front of
motor vehicles. During the test, shut down the engine of direct current-driven horn;
place the vehicle on a flat and spacious ground. During the test, background noise
shall be at least 10 dB(A) lower than the sound pressure level being tested.
GB 15742-2001
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.10
T 36
Replacing GB 15742-1995
Performance Requirements and
Test Methods of Horn for Motor Vehicles
ISSUED ON. JANUARY 10, 2001
IMPLEMENTED ON. OCTOBER 1, 2001
Issued by. The Quality and Technical Supervision Bureau of the People’s
Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Performance Requirements and Test Methods of Horn ... 5 
4 Performance Requirements and Test Methods of Horn Installed on Motor
Vehicles ... 8 
Appendix A (standard appendix) ... 10 
Foreword
All the technical content in this Standard is compulsory.
This Standard is formulated in accordance with relevant technical content in ECER 28.
1993 Approved Uniform Standards of Sound Warning Devices and Acoustic Signals
for Motor Vehicles - Series 02. The main technical content of this Standard is
equivalent to it. There are merely slight differences in the stipulation of the maximum
sound pressure level of pneumatic and electric-pneumatic horns.
This Standard merely stipulates main characteristics and test methods of adopting
various horns on motor vehicles. Other requirements that are not stipulated in this
Standards shall comply with relevant industry standards.
In comparison with GB 15742-1995, there are the following differences.
1. The name of this Standard is modified into “Performance Requirements and
Test Methods of Horn for Motor Vehicles”; the scope of application is expanded
to include electric horns, pneumatic horns and electric-pneumatic horns;
Category-L3, Category-L4 and Category-L5 motorcycles are added as
applicable motor vehicle models.
2. “Semi-anechoic chamber” is added to the test environment.
3. Performance requirements of horn for motorcycles (power > 7 kW and power ≤
7 kW) are distinguished. Performance requirements of horn for motorcycles
(power > 7 kW) are the same as automobiles.
4. Performance requirements and test methods of horn for motor vehicles, and
performance requirements and test methods of horn installed on motor vehicles
are respectively listed as 2 main parts.
Since the date of implementation, this Standard shall serve as a replacement of GB
15742-1995.
Appendix A of this Standard is standard appendix.
This Standard is proposed by the State Administration of Machinery Industry.
This Standard is summarized by National Technical Committee on Automobile
Standardization.
This Standard is mainly drafted by the following organizations. Harbin FEIBEN Auto-
electric Appliance Co., Ltd., Shanghai SIIC Transportation Electric Co., Ltd., Hubei
Auto-electric Appliance Co., Ltd., Ruian Rizheng Automobile Parts Co., Ltd.,
Guangzhou Automobile Horn Factory.
Performance Requirements and
Test Methods of Horn for Motor Vehicles
1 Scope
This Standard specifies performance requirements and test methods of horn for direct
current-driven and compressed air-driven motor vehicles; performance requirements
and test methods of horn installed on motor vehicles.
This Standard is applicable to Category-M, Category-N, Category-L3, Category-L4 and
Category-L5 motor vehicles.
2 Normative References
The clauses that are included in the following standards constitute the clauses of this
Standard through reference. When this Standard is published, all the released versions
are valid. All the standards will be revised. All parties adopting this Standard shall study
the possibility of adopting the newest version of the following standards.
IEC 651-1979 Sound Level Meter
IEC 225-1966 1/1 Frequency Interval, 1/2 Frequency Interval and 1/3 Frequency
Interval Bandpass Filter for Sound and Vibration Analysis
3 Performance Requirements and Test Methods of
Horn
3.1 Performance Requirements
3.1.1 General requirements
Horn shall send out successive and uniform sound. In terms of pneumatic and electric-
pneumatic horn, the duration from the moment, when the horn is pushed to the moment
when sound pressure level reaches the value stipulated in 3.1.2, shall not be more
than 0.2 s.
3.1.2 Sound pressure level
3.1.2.1 Under the conditions stipulated in 3.2.3.1, A-weighted sound pressure level at
a distance of 2 m from the horn shall not exceed the following numerical values.
a) 115 dB(A). horn for motorcycles (power ≤ 7 kW);
3.2.2.1 The test of sound pressure level shall adopt sound pressure meter (Level-1
accuracy) that is stipulated in IEC 651. The test of sound pressure level shall adopt
fast time constant “F”; the test of total sound pressure level shall adopt “A” metering
gear; the benchmark sound pressure shall be 20 μPa.
3.2.2.2 The frequency spectrum of sound shall be obtained through Fourier transform
of acoustical signal. 1/3 frequency interval bandpass filter can be adopted in
accordance with the stipulation in IEC 225. In terms of sound pressure level (center
frequency. 2,500 Hz), it can be obtained through the mean square value of sound
pressure of 1/3 center frequency 2,000 Hz, 2,500 Hz and 3,150 Hz. Generally speaking,
only Fourier transform shall be adopted.
3.2.2.3 The accuracy of electrical test instrument is Level-0.5.
3.2.3 Test Conditions
3.2.3.1 In terms of direct current-driven horn.
a) In accordance with nominal voltage 6 V, 12 V and 24 V, test voltage shall be 6.5
V, 13 V and 26 V. Test voltage shall be tested through the power output end.
b) If rectified current is adopted in the test, the voltage alternating component
tested on the power terminal when the horn is working shall not be more than
0.1 V (peak/peak value).
c) Wiring resistance that includes connector and contact resistance is as follows.
Nominal voltage 6 V. 0.05 Ω;
Nominal voltage 12 V. 0.10 Ω;
Nominal voltage 24 V. 0.20 Ω.
3.2.3.2 In terms of pneumatic and electric-pneumatic horns, the test shall be conducted
under the air pressure condition or voltage condition stipulated by manufacturers.
3.2.4 Horn installation in test
3.2.4.1 Horn shall be firmly installed on a metal base frame in accordance wi...