GB/T 23828-2023 PDF in English
GB/T 23828-2023 (GB/T23828-2023, GBT 23828-2023, GBT23828-2023)
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Light-emitting diode changeable message signs of motorway
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Standards related to: GB/T 23828-2023
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GB/T 23828-2023: PDF in English (GBT 23828-2023) GB/T 23828-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.220.20;93.080.30
CCS R 85
Replacing GB/T 23828-2009
Light-emitting diode changeable message signs of motorway
ISSUED ON: MARCH 17, 2023
IMPLEMENTED ON: OCTOBER 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Classification, composition and model ... 9
5 Technical requirements ... 10
6 Test methods ... 21
7 Inspection rules ... 32
8 Marks, packaging, transportation and storage ... 35
Annex A (normative) Data exchange format ... 37
Bibliography ... 54
Light-emitting diode changeable message signs of motorway
1 Scope
This document specifies the classification, composition and model, technical
requirements, test methods, inspection rules, as well as signs, packaging, transportation
and storage for light-emitting diode (LED) changeable message signs of motorway.
This document applies to the production, use and inspection for light-emitting diode
changeable message signs of motorway.
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 191, Packaging and storage marks
GB/T 2312, Code of Chinese graphic character set for information interchange -
Primary set
GB/T 2423.1, Environmental testing for electric 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 - Part 2: Testing method - Test Cab: Damp heat,
steady state
GB/T 2423.10, Environmental testing - Part 2: Test methods - Test Fc: Vibration
(sinusoidal)
GB/T 2423.17, Environmental testing for electric and electronic products - Part 2:
Test method - Test Ka: Salt mist
GB/T 2423.22, Environmental testing - Part 2: Test methods - Test N: Change of
temperature
GB/T 3681.1, Plastics - Methods of exposure to solar radiation - Part 1: General
guidance
well as the followings apply.
3.1 LED changeable message signs
The equipment that the full screen uses LED as the light-emitting unit, which can
change different traffic information on the display screen through automatic or manual
control.
3.2 pixel
The smallest imaging unit of LED variable information signs.
3.3 LED panel
It is composed of one or several display modules, which can be controlled by the display
control system to complete the screen display.
[Source: SJ/T 11141-2017, 3.2]
3.4 dotpitch
The center-to-center distance between adjacent pixels.
3.5 half-intensity angle
The minimum angle between the measuring optical axis when the luminous intensity
of a single LED is half of its maximum luminous intensity and the measuring optical
axis of the maximum luminous intensity.
3.6 angle of deflection
The angle between the measuring optical axis of the maximum luminous intensity of a
single LED and the normal optical axis.
3.7 viewing angle
The maximum distance that the observer (normal person, with corrected vision of 1.0
or above) can correctly read the content of the sign within the specified distance, after
deviating from the normal direction of the sign surface, under the condition that the
ambient illuminance is greater than 50,000 lx on a sunny day and the sun shines on the
sign surface.
3.8 static distinguishing distance
The maximum distance that the observer (normal person, with corrected vision of 1.0
or above) can correctly read the content of the sign within the specified viewing angle
under the condition that the ambient illuminance is greater than 50,000 lx on a sunny
day and the sun shines on the sign surface.
The insulation resistance between the power terminal and the casing of the LED
changeable message sign of motorway shall not be less than 100 MΩ.
5.9.2 Electric strength
Apply a sinusoidal AC voltage with a frequency of 50 Hz and an effective value of 1500
V between the power terminal of the highway LED variable information sign and the
casing for 1 min. There shall be no flashover or breakdown.
5.9.3 Safety grounding
LED changeable message signs of motorway shall be equipped with safety protection
grounding terminals. The grounding terminal is reliably connected to the casing
(including the metal casing of the live parts). The connection resistance between the
ground terminal and the casing shall be less than 0.1 Ω.
5.9.4 Power adaptability
LED changeable message signs of motorway shall adapt to the requirements of power
grid fluctuations, and shall work normally under the following conditions:
- Voltage: AC 220 V ± 33 V;
- Frequency: 50 Hz ± 2 Hz.
5.9.5 Contact current
When the LED changeable message sign of motorway is working, the contact current
between the power terminal and the ground terminal shall be less than 3.5 mA.
5.9.6 Lightning protection and overvoltage protection
Necessary lightning protection and overvoltage protection measures shall be taken for
LED changeable message signs of motorway. The interfaces, components and
protective measures adopted shall meet the requirements of GB/T 18802.11.
5.10 Degree of protection for casing
Rainproof and dustproof measures shall be taken for LED changeable message signs of
motorway. The protection level of the casing shall not be lower than IP56 according to
the provisions of GB/T 4208-2017. The protection level of the casing of the LED
changeable message sign of motorway applied in the tunnel environment shall be IP66.
5.11 Electromagnetic compatibility
5.11.1 Surge immunity
It shall meet the requirements of GB/T 9254.2.
5.11.2 Electrostatic discharge immunity
Conduct electrostatic discharge immunity tests on the points and surfaces that operators
may touch when using the LED changeable message signs of motorway, as well as user
maintenance points. The product shall work normally.
5.11.3 Immunity to radio frequency electromagnetic field radiation
Carry out the radio frequency electromagnetic field radiation immunity test on the four
sides of the LED changeable message sign of motorway in normal operation at the
vertical polarization and horizontal polarization positions of the transmitting antenna,
respectively. The product shall work normally.
5.11.4 Electrical fast transient burst immunity
Conduct electrical fast transient burst immunity test on the power port, signal and
control port of the LED changeable message sign of motorway and the grounding wire
of the chassis. The product shall work normally.
5.12 Mechanical properties
The structure of LED changeable message signs of motorway shall be stable. After
bearing the wind pressure generated by the wind speed of 40 m/s, the deformation shall
not be greater than 2 mm, and the performance of the sign board shall not be affected.
5.13 Communication interface and procedures
5.13.1 The interface shall use an Ethernet interface with a rate not lower than 100 Mbit/s.
It shall comply with the regulations of 100BASE-TX in IEEE 802.3-2018.
5.13.2 When providing other interfaces and procedures, detailed interface parameters
and communication procedures shall be provided for connection with the system.
5.13.3 The connection between the interface and the outside shall be convenient for
installation and maintenance. Take waterproof, dustproof and other measures.
5.13.4 The data interaction format adopted by LED changeable message signs of
motorway shall comply with the provisions of Annex A.
5.14 Environmental adaptability
5.14.1 Low temperature resistance performance. According to the test method given in
6.14.1, the LED changeable message sign of motorway is tested under the electrified
state. The product shall work normally.
5.14.2 Storage performance at low temperature. According to the test method given in
6.14.2, the LED changeable message sign of motorway is tested under the power-off
state. After recovery, the product shall start normally, and the logic is correct.
5.16.2 Automatic functions
After being connected to the system through the communication interface, it shall be
able to accept the control of the system or the main control unit. Correctly display the
corresponding content according to the command of the system or the main control unit
and upload the working status to the system or the main control unit.
5.16.3 Manual functions
When deviating from the automatic control of the system, it shall be possible to
manually control the displayed content locally or remotely.
5.16.4 Self-test function
It can automatically detect and feed back to the upper computer the fault status and
location of pixels, drive modules, etc., the working status of the lightning protector, the
status of the door switch, the input voltage of the power supply, the temperature in the
chassis, etc.
5.16.5 Dimming function
The LED changeable message sign of motorway shall be equipped with an ambient
illumination detection device. The luminous intensity of pixels can be adjusted
according to the ambient illuminance to avoid glare when the ambient illuminance is
low and affect the visual reading of information. Dimming level shall not be less than
32 levels.
5.16.6 Local storage function
LED changeable message signs of motorway shall have the function of storing pictures,
texts and other information locally.
5.17 Information security
5.17.1 Access and visit control
LED changeable message signs of motorway shall have the ability to identify the host
computer and users. Only authorized host computers and users can access and manage
the controller software.
The upper computer shall have the detection and alarm function of power failure and
unauthorized removal of the controller.
5.17.2 Remote security management function
The LED changeable message sign of motorway shall support remote updating of keys,
key configuration parameters, key system patches, etc.
5.17.3 Emergency display function
- Welcome to use the ×××× Expressway;
- Heavy fog, and the speed limit is 20 km/h;
- The traffic volume is heavy, and the speed limit is 80 km/h.
6.7.3 Test staff. Divide into two groups. One group is controllers that publish the content
of 6.7.2. The other group is the visual recognizers who recognize and read the content,
usually three or five people.
6.7.4 Test results. The test results are divided into qualified results and unqualified
results. The conclusion of most viewers shall be the final result. For each visual
recognizer, when the correct rate of the content of the sign is not less than 90% and the
unclear rate is not greater than 50%, it is qualified. If the accuracy rate of the logo
content is lower than 90% or the unclear rate is greater than 50%, it is unqualified.
6.7.5 Test plan for static distinguishing distance. The controller combines the contents
specified in 6.7.2 into 10 pieces of test information in any order. Display in full screen
at intervals of 30 s. The programming sequence and content shall not be notified to the
viewer in advance. The viewer recognizes, records, and evaluates the display content
of the sign within the specified viewing angle and viewing distance.
6.7.6 Test plan for dynamic distinguishing distance. Choose 3 items from 6.7.2 as test
information. Display on the sign before the viewer passes the maximum distinguishing
distance of 210 m, ensuring that the viewer has enough time to read the content on the
sign before 210 m. Turn off the display immediately within 2 s after the test vehicle
passes 210 m. Display 1 message at a time. Conduct three times in total. Record and
evaluate test results.
6.7.7 Test plan for viewing angle. The controller combines the contents specified in
6.7.2 into 10 pieces of test information in any order. Display in full screen at intervals
of 30 s. The programming sequence and content shall not be notified to the viewer in
advance. The viewer reads the display content of the sign at 10 m in front of the
changeable message sign under the daytime ambient light condition. Record and
evaluate test results.
6.7.8 Pixel light uniformity. When measuring the luminous uniformity of pixels, the
number of pixels under test shall not be less than 10% of the total. Measure the normal
luminous intensity of the extracted pixels according to the method in 6.2.2. Or use a
luminance meter to directly measure the normal luminance of a pixel. Obtain a measure
column. Find the mean, minimum, and maximum values of the measured columns,
respectively. Calculate the non-uniformity of pixel light emission according to formula
(3).
adjustable AC power supply. Power frequency is 50 Hz. The test voltages are
187V→200V→220V→240V→253V→230V→210V→187V. After the voltage is
adjusted to the first gear and stabilized, turn on and off the power switch of the LED
changeable message sign of motorway, respectively.
6.9.5 Frequency fluctuation adaptability. Supply power by adjustable frequency AC
power. The power supply voltage is AC 220 V. The test frequencies are
48Hz→49Hz→51Hz→52Hz, respectively. After each frequency is adjusted to the first
gear and stabilized, turn on and off the power switch of the LED changeable message
sign of motorway, respectively.
6.9.6 The contact current test shall be carried out according to the provisions of GB
4943.1. The input voltage of the LED changeable message sign of motorway is 1.06
times of the rated voltage.
6.10 Enclosure protection level
The enclosure protection level test shall be carried out in accordance with the provisions
of GB/T 4208-2017.
6.11 Electromagnetic compatibility
6.11.1 The surge immunity test shall be carried out according to the provisions of GB/T
9254.2.
6.11.2 The electrostatic discharge immunity test shall be carried out according to the
provisions of GB/T 17626.2. The test voltage of contact discharge is ±4 kV. The test
voltage of air discharge is ±8 kV. Apply at least 10 single discharges. The discharge
interval is not less than 1 s.
6.11.3 The radio frequency electromagnetic field radiation immunity test shall be
carried out according to the provisions of GB/T 17626.3. The test field strength is 3
V/m.
6.11.4 The electrical fast transient burst immunity test shall be carried out according to
the provisions of GB/T 17626.4. Apply the 2kV test voltage to the power supply port
and the protective ground through the coupling/decoupling network. Apply 1 kV test
voltage to the input and output signal and control ports through the coupling/decoupling
network. Pulse repetition rate is 100 kHz. Apply the test voltage five times. The duration
of each time is not less than 1 min.
6.12 Mechanical properties
6.12.1 It is suitable to use the wind tunnel to simulate the 40 m/s wind speed to carry
out the structural stability test of the LED changeable message sign of motorway. When
there is no wind tunnel test condition, the simulation test can be carried out with
sandbags according to 6.12.2.
6.12.2 The test device of the sandbag test method consists of a base and a support arm,
which can support flat and sideways placement of signs. The test is carried out
according to the following steps:
a) Install the panel of the LED changeable message sign of motorway downwards
and horizontally on the support arm. Maintain it stable for 10 min. Use the
measuring tools specified in 6.3.3 to test the structural size of the sign.
b) Add sandbags evenly to the back of the LED changeable message sign of
motorway. The positive pressure generated by the sandbag on the back projection
surface of the sign is 1.5 kN/m2. After loading, keep 10 min and remove the
sandbag. Immediately test the structural size of the sign.
c) Install the panel of the LED changeable message sign of motorway upwards and
horizontally on the support arm. Maintain it stable for 10 min. Use the measuring
tools specified in 6.3.3 to test the structural size of the sign.
d) Add sandbags evenly on the panel of the LED changeable message sign of
motorway. The positive pressure generated by the sandbag on the sign panel is
1.5 kN/m2. After loading, keep 10 min and remove the sandbag. Immediately test
the structural size of the sign.
6.13 Communication interface and procedure
The test method of communication interface and procedure is divided into two parts:
subjective evaluation and objective test. Subjective evaluation is to connect the LED
changeable message sign of motorway with the host computer, so as to verify that the
LED changeable message sign of motorway and the host computer can realize two-way
data transmission. The objective test shall be carried out according to the provisions of
GB/T 34428.1 and GB/T 34428.3.
Read the exchange data. Check according to the requirements of Annex A.
6.14 Environmental adaptability
6.14.1 The low temperature resistance performance test shall be carried out according
to the provisions of GB/T 2423.1. The temperature is -5°C (or -20°C, -40°C, -55°C).
The test time is 8 h.
6.14.2 The low temperature storage performance test shall be carried out according to
the provisions of GB/T 2423.1. The temperature is -5°C (or -20°C, -40°C, -55°C). The
test time is 8 h. After the test, recover at room temperature for 2 h.
6.14.3 The high temperature working performance test shall be carried out according to
the provisions of GB/T 2423.2. The temperature is +45°C (or +50°C, +55°C, +70°C,
+85°C). The test time is 8 h.
6.14.4 The performance test of heat and humidity resistance shall be carried out
according to the provisions of GB/T 2423.3. The temperature is +40°C. The relative
humidity (98±2)%. The test time is 48 h.
6.14.5 The temperature alternating performance test is carried out according to the
provisions of GB/T 2423.22 test Na. Keep at high temperature +70℃ for 2 h. Transfer
to low temperature -40°C within 3 min and keep for 2 h. Transfer to high temperature
again within 3 min. In this way, cycle for 5 times.
6.14.6 The mechanical vibration resistance performance test shall be carried out
according to the provisions of GB/T 2423.10. The frequency range is 2 Hz ~ 150 Hz.
Control by displacement at 2 Hz ~ 9 Hz. The displacement amplitude is 3.5 mm. Control
by acceleration at 9 Hz ~ 150 Hz. The acceleration amplitude is 10 m/s2.
2Hz→9Hz→150Hz→9Hz→2Hz is a cycle, a total of 20 cycles.
6.14.7 The salt spray corrosion resistance test shall be carried out according to the
provisions of GB/T 2423.17. The test time is 168 h.
6.14.8 There are two methods for weather resistance: natural exposure test and artificial
accelerated aging test.
The natural exposure test shall be carried out according to the provisions of GB/T
3681.1.
The artificial accelerated aging test is carried out according to the following steps:
a) Specimen sampling position and preparation conditions. Specimens for aging test
shall be taken from the product. When sampling is difficult, a small sample can
be used instead. The treatment process of the small sample shall be the same as
that of the whole product.
b) Quantity of specimens. Take 9 pieces of shell and supporting base plate, of which
6 pieces are used for test and 3 pieces are used as reference samples. They are
stored in a darkroom. There are 12 pixels. 6 are used for testing, and 6 are used
as reference samples, which are stored in a dark room.
c) The size of the specimen (except pixels): 65 mm × 142 mm.
d) Test equipment: xenon arc lamp artificial accelerated weather resistance test
chamber.
e) Test conditions. The irradiance of the light source with a wavelength of 290 nm ~
800 nm is 550 W/m2. The spectral irradiance at the spectral wavelength of 340
nm is not greater than 0.50 W/(m2·nm). For specimens on the plane of the
specimen holder parallel to the lamp axis, the difference in irradiance between
any two points on the surface shall not be greater than 10%. During the test,
continuous irradiation and periodic water spraying are adopted. The water spray
cycle is 18min/102min (water spray time/no water spray time), that is, every 120
6.17.1 Authorized host computer and user access to LED changeable message signs of
motorway shall be able to access and manage the software. Using an unauthorized host
computer and users accessing the product shall not be able to access and manage the
software.
Simulate power failure of the LED changeable message sign of motorway, unauthorized
removal of the controller. Check the alarm status of the upper computer.
6.17.2 Authorized users remotely access the LED changeable message sign of
motorway, and remotely update keys, key configuration parameters, and key system
patches.
6.17.3 Simulate controller failure of the LED changeable message sign of motorway or
communication connection interruption with host computer. Check the product display.
6.17.4 Check the log content of the LED changeable message sign of motorway.
6.17.5 Check the encryption and decryption function of cryptography to protect the
confidentiality of sensitive information or communication messages in the
communication process. Verify the correctness and effectiveness of the confidentiality
protection mechanism for sensitive information or communication messages.
Check the integrity protection of data in the communication process by cryptographic
technology. Verify the correctness and effectiveness of the communication data
integrity protection mechanism.
6.17.6 Check the compliance of the encryption technology used with the national
standard or industry standard. Check the compliance of cryptographic algorithms with
national standards or industry standards. Or obtain a certificate from the national
encryption management department agreeing to its use. Check the compliance of
encryption products with the regulations of the national encryption management
department.
7 Inspection rules
7.1 Inspection classification
7.1.1 The inspection of LED changeable message signs of motorway is divided into
type inspection and exit-factory inspection.
7.1.2 In one of the following situations, type inspection shall be carried out:
a) When a new product is trial-formulated and identified or an old product is
transferred to a factory for production;
b) After formal production, if there are major changes in materials, structures, and
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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