GB 8108-2014 PDF English (GB 8108-1999: Older version)
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Vehicle electronic sirens
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| GB 8108-1999 | English | 439 |
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Vehicle-used electronic siren
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Performance requirements and test methods for alarm unit on vehicle
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PDF Preview: GB 8108-2014
GB 8108-2014: PDF in English GB 8108-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.320
A 91
Replacing GB 8108-1999
Vehicle electronic sirens
ISSUED ON: DECEMBER 05, 2014
IMPLEMENTED ON: JULY 01, 2015
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Classification and naming ... 6
5 Requirements ... 7
6 Test methods ... 11
7 Installation ... 17
8 Inspection rules ... 17
9 Markings, certificates, packaging ... 19
References ... 21
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Classification and naming ... 7
5 Requirements ... 8
6 Test methods ... 12
7 Installation ... 18
8 Inspection rules ... 18
9 Markings, certificates, packaging ... 20
Foreword
Clause 5 (except for 5.1), clause 7, clause 9.1 of this standard are
mandatory. The rest is recommended.
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 8108-1999 “Vehicle electronic sirens”. As compared
with GB 8108-1999, except for editorial modifications, the main technical
changes are as follows:
- MODIFY the Scope (see clause 1; clause 1 of the 1999 version);
- MODIFY the normative references (see clause 2; clause 2 of the 1999
version);
- MODIFY the definition of reference plane, reference axis, reference point
(see clause 3.1, 3.2, 3.3; clause 3.1, 3.2, 3.3 of the 1999 version);
- ADD the definition of conversion efficiency (see 3.5);
- MODIFY the classification and naming (see clause 4; clause 4 of the 1999
version);
- ADD the requirements for electrical components (see 5.2);
- ADD the requirements for basic functions (see 5.3);
- ADD the requirements for output power (see 5.4);
- MODIFY the requirements for sound pressure level (see 5.4.4; 5.5 of the
1999 version);
- MODIFY the requirements for the acoustic frequency and repeated pitch
cycle of each tone of the siren (see 5.4.5; 5.6 of 1999 version);
- ADD the electrical performance (see 5.5, 6.6);
- DELETE the voltage fluctuation test (5.7, 5.11, 6.4 of the 1999 version);
- DELETE the requirements of various test results as compared with the
parameters measured during the sound pressure level test (5.11 of 1999
version);
- DELETE the requirements of various test results as compared with the
parameters measured during the audio analysis test (5.12 of the 1999
version);
Vehicle electronic sirens
1 Scope
This standard specifies the classification, requirements, test methods,
installation, inspection rules, markings, certificates, packaging for electronic
sirens installed on police cars, fire engines, ambulances, engineering rescue
vehicles.
This standard applies to electronic sirens installed on police cars, fire engines,
ambulances, engineering rescue vehicles.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 2423.1 Environmental testing for electric and electronic and electronic
products - Part 2: Test methods - Tests A: Cold
GB/T 2423.2 Environmental testing for electric and electronic products - Part
2: Test methods - Tests B: Dry heat
GB/T 2423.3 Environmental testing for electric and electronic products - Part
2: Testing method - Test Cab: Damp heat steady state
GB/T 2423.6 Environmental testing for electric and electronic products - Part
2: Test methods - Test Eb and guidance: Bump
GB/T 2423.10 Environmental testing for electric and electronic products -
Part 2: Tests methods - Test Fc: Vibration (sinusoidal)
GB/T 2423.37 Environmental testing for electric and electronic products -
Part 2: Test methods - Test L: Dust and sand
GB/T 2423.38 Environmental testing for electric and electronic products -
Part 2: Test methods - Test R: Water test method and guidance
GB/T 3767 Acoustics - Determination of sound power levels and sound
energy levels of noise sources using sound pressure - Engineering methods
for an essentially free field over a reflecting plane
GB/T 3785.1 Electroacoustics - Sound level meters - Part 1: Specifications
GB/T 19666 Flame retardant and fire resistant wires and cables
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Reference plane
When the sound pressure level of the speaker is tested, the plane directly in
front of the sounding direction and perpendicular to the ground.
3.2
Reference axis
A line perpendicular to the reference plane and through a single speaker’s
sounding system center or array speaker’s geometry center.
3.3
Reference point
The intersection of the reference plane and the reference axis.
3.4
Rated power
Within the frequency range specified in this standard, the maximum power
value that an electronic siren can withstand without causing damage to
mechanical, electrical and thermal properties.
3.5
Conversion efficiency
The ratio of the output power to the input power of the electronic siren.
4 Classification and naming
4.1 Classification
Electronic sirens (hereinafter referred to as sirens) may be divided into integral
type and split type according to the structure. The integral siren consists of a
The siren shall work normally and have no electrical faults in a low-temperature
environment of -40 °C. After the test, the variation of sound pressure level shall
not exceed ±3 dB. The variation of acoustic frequency shall not exceed ±20 Hz.
The repeated pitch cycle shall be between -10% and +10%.
5.8 Constant-temperature-and-humidity performance
The siren shall work normally and have no electrical faults in a constant-
temperature-and-humidity environment. After the test, the variation of sound
pressure level shall not exceed ±3 dB. The variation of acoustic frequency shall
not exceed ±20 Hz. The repeated pitch cycle shall be between -10% and +10%.
5.9 Rainproof performance (only for speakers and outdoor open-air sirens)
The siren shall be able to withstand the rain test. It shall work normally and
without electrical faults during and after the test.
5.10 Dustproof performance (only for speakers and outdoor open-air
sirens)
The siren shall be able to withstand the dust test. It shall work normally and
without electrical faults during and after the test.
5.11 Vibration-resistance
The siren shall be able to withstand the vibration test. During and after the test,
it shall be able to work normally and without electrical failure. There shall be no
permanent structural deformation. The parts and components shall not be
damaged. The fastening parts shall not loose. The plug-in connectors shall not
fall off or be in poor contact.
5.12 Impact-resistance
The siren shall be able to withstand the impact test. During and after the test, it
shall be able to work normally and without electrical failure. There shall be no
permanent structural deformation. The parts and components shall not be
damaged. The fastening parts shall not loose. The plug-in connectors shall not
fall off or be in poor contact.
5.13 Reliability of continuous operation
The siren shall be able to work continuously for 200 hours without failure. After
200 hours of continuous operation, the variation of sound pressure level shall
not exceed ±3 dB. The variation of acoustic frequency shall not exceed ±20 Hz.
The variation of repeated pitch cycle shall be within -10% ~ +10%.
η - Conversion efficiency, in percentage (%);
P - Output power, in watts (W);
I - Input current, in amps (A);
U2 - Input voltage, in volts (V).
6.5.3 Test of pure tone inspection of speaker
Feed the speaker with a sinusoidal voltage equivalent to 1/2 of the rated power.
At three frequency points of 500 Hz, 1000 Hz, 1500 Hz, detect the sound
emitted by the speaker. The detection distance is 2 m.
6.5.4 Test of sound pressure level
6.5.4.1 Test device
The sound level meter used for the test shall meet the requirements of GB/T
3785.1. Its accuracy is grade-I.
6.5.4.2 Test method
Place the siren’s controller, microphone, speaker on the test bench in the
normal working position. When measuring a single speaker, place the sound
level meter facing the speaker’s reference surface on the reference axis 2 m
away from the reference point. When the measured more than two speakers
are consistent in directivity, place the sound level meter facing the speaker’s
reference plane on the axis of symmetry center 2 m from the reference point.
Power the siren. Adjust the siren’s volume adjustment knob to the maximum
position. Follow the requirements of Table 2 to measure the sound pressure
level at each angle relative to the reference axis. At each angle, make one
measurement per 5 s, totally 3 measurements are made. Take the average
sound pressure value.
6.5.5 Test of audio analysis
Connect the siren’s controller, the microphone, the equivalent resistance which
replaces the speaker in the normal working mode. Power the siren. After the
power is turned on, adjust the siren’s volume adjustment knob to the maximum
position. Collect the output signals from the siren to carry out spectrum analysis.
Respectively measure and record the acoustic frequency and repeated pitch
cycle of each tone of the siren.
6.5.6 Test of harmonic distortion
Install the microphone on the test frame according to the normal use state. The
sound input hole of the microphone shall be on the axis of the simulation port
The test device shall meet the requirements of GB/T 2423.1.
6.8.2 Test method
Connect the siren’s controller, microphone, speaker into a complete system. In
the unpowered state, place it in a low-temperature test chamber. Follow the
steps below:
a) After placing it at ambient temperature of -40 °C ± 3 °C for 4 h, turn on the
siren’s power supply. Check whether the siren can send a clear and
identifiable siren sound;
b) Disconnect the siren’s power. Restore it to room temperature. Remove the
siren’s controller, microphone, speaker.
After the test, check the siren’s function. Use the method as specified in 6.5.4
to test the sound pressure level on the reference axis of the siren. Use the
method as specified in 6.5.5 to carry out the audio analysis test.
6.9 Constant damp-heat test
6.9.1 Test device
The test device shall comply with the requirements of GB/T 2423.3.
6.9.2 Test method
Connect the siren’s controller, microphone, speaker into a complete system. In
the unpowered state, place it in a low-temperature test chamber. Follow the
steps below:
a) The siren is maintained in an environment of dry bulb temperature 40 °C
± 2 °C and a relative humidity 90% ~ 95% for 24 h;
b) Turn on the siren’s power. Select any one of the tones to work and adjust
the siren’s volume adjustment knob to the maximum position. Maintain for
another 24 h. Turn off the siren’s power.
After the test, check the siren’s function. Use the method as specified in 6.5.4
to test the sound pressure level on the reference axis of the siren. Use the
method as specified in 6.5.5 to carry out the audio analysis test.
6.10 Rain test
6.10.1 Test device
The test device shall comply with the requirements of GB/T 2423.38.
6.10.2 Test method
times against the siren. The corresponding speed change is 1.0 m/s. During
and after the test, check the appearance, structure, working condition of the
siren.
6.14 Test of continuous operation reliability
Place the siren in a room temperature environment. After power-on, select one
of the tones and adjust the siren’s volume adjustment knob to the maximum
position, to carry out 200 cycles of test. In each cycle, the siren will work
continuously for 30 minutes and then off for 30 minutes.
After the test, check the siren’s function. Use the method as specified in 6.5.4
to test the sound pressure level on the reference axis of the siren. Use the
method as specified in 6.5.5 to carry out the audio analysis test.
7 Installation
The installation of the siren on the vehicle follows the following principles:
a) It shall use the connectors and fasteners to reliably connect and fix the
siren;
b) The fuse of the positive pole of the siren’s power line shall be placed at
the positive end of the battery of the vehicle, at a distance less than 200
mm from the connection end of the battery;
c) The negative pole of the power supply shall be directly connected to the
negative pole of the battery;
d) When the line of the siren needs to pass through the metal hole in the
vehicle, it shall add a sheath to the metal hole;
e) The installation of the siren shall not affect the structural strength, electrical
safety, driving safety of the vehicle;
f) Meet other requirements as specified in the instruction manual.
8 Inspection rules
8.1 Type inspection
The type inspection of the siren is carried out in the following cases:
a) When the product is newly designed for trial production or product type
identification;
b) In case of trans-production or trans-plant production;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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