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GA/T 1255-2016: Police digital trunking communication system Technical requirements and measurement methods for radio frequency equipment
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GA
PUBLIC SECURITY INDUSTRY STANDARD
ICS 33.060.01
A 90
Police Digital Trunking Communication System - Technical
Requirements and Measurement Methods for Radio
Frequency Equipment
Issued on. SEPTEMBER 8, 2016
Implemented on. SEPTEMBER 8, 2016
Issued by. The Ministry of Public Security of the People’s Republic of China
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms, Definitions, Symbols and Abbreviations... 7
3.1 Terms and Definitions... 7
3.2 Symbols and Abbreviations... 10
4 Classification... 10
5 Requirements... 11
5.1 RF Performance Requirements... 11
5.2 Electromagnetic Compatibility Requirements... 13
5.3 Electrical Safety Requirements... 14
5.4 Environmental Adaptability Requirements... 14
6 RF Performance Parameter Test Conditions and Test Methods... 17
6.1 RF Performance Parameter Test Conditions... 17
6.2 Transmitter RF Performance Parameter Test Methods... 19
6.3 Receiver RF Performance Parameter Test Methods... 26
7 Electromagnetic Compatibility Test Methods... 34
7.1 Conducted Disturbance... 34
7.2 Radiated Disturbance... 34
7.3 Electrostatic Discharge Immunity... 34
7.4 RF Electromagnetic Field Radiation Immunity... 34
7.5 Electrical Fast Transient Pulse Group (Power Port) Immunity... 35
7.6 Surge (Power Port) (Impact) Immunity... 35
7.7 Conducted Disturbance Immunity of RF Induction (Power Port)... 35
7.8 Immunity to Voltage Sags, Short Interruptions and Voltage Variations (Power Port)... 35
8 Electrical Safety Test Methods... 35
9 Environmental Adaptability Test Methods... 35
9.1 Test Methods for Mechanical Environmental Adaptability... 35
9.2 Test Methods for Climate and Environmental Adaptability... 37
9.3 Test Methods for Enclosure Protection Level... 40
9.4 Test Methods for Adaptability to Hazardous Environments... 40
Appendix A (normative) Test Sites and Site Layout Guide for Radiation Test... 41
Appendix B (normative) General Test Methods for Radiated Spurious Emissions... 44
1 Scope
This Standard stipulates the terms, definitions, symbols and abbreviations, classification,
requirements and measurement methods for radio frequency equipment of the police digital
trunking communication system.
This Standard is applicable to the transceiver stations, mobile stations and portable stations of
the police digital trunking communication system, as well as their related systems and other
equipment.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 2423.1-2008 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Tests A. Cold
GB/T 2423.2-2008 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Tests B. Dry Heat
GB/T 2423.3-2006 Environmental Testing for Electric and Electronic Products - Part 2.
Testing Method - Test Cab. Damp Heat, Steady State
GB/T 2423.5-1995 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Test Ea and Guidance. Shock
GB/T 2423.8-1995 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Test Ed. Free Fall
GB/T 2423.10-2008 Environmental Testing for Electric and Electronic Products - Part 2.Tests
Methods - Test Fc. Vibration (Sinusoidal)
GB/T 2423.17-2008 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Test Ka. Salt Mist
3 Terms, Definitions, Symbols and Abbreviations
3.1 Terms and Definitions
3.1.1 Transceiver station
The combination unit of a transmitter that converts baseband signals into radio frequency
signals and a receiver that receives radio frequency signals from the antenna feed system and
restores them to baseband signals in a radio communication system.
3.1.2 Mobile station
A wireless intercom device with an external antenna interface, usually installed on vehicles
such as cars and ships and powered by them.
3.1.3 Portable station
A wireless intercom device with an external antenna interface, which is easy to carry
(hand-hold or wear) and powered by a built-in power supply of the device.
3.1.7 Non-weather-protected location
The place of activities directly affected by the weather.
3.1.8 Transmitter power (conducted)
The average power supplied to the transmission line by the transmitter equipped with an
antenna port in one RF cycle.
3.1.9 4FSK modulation frequency deviation error
The error ratio between the transmitter 4FSK code modulation frequency deviation and the
code modulation frequency deviation specified in GA/T 1056-2013.
3.1.10 4FSK transmitter bit error ratio
The bit error ratio of the signal transmitted by the transmitter.
3.2 Symbols and Abbreviations
The following symbols and abbreviations are applicable to this document.
4 Classification
The transceiver stations, mobile stations and portable stations of the police digital trunking
communication system (hereinafter referred to as the PDT equipment) are divided into the
following categories according to the applicable climate environment.
5 Requirements
5.1 RF Performance Requirements
5.1.1 Transmitter RF performance requirements
The transmitter RF performance indicators shall comply with the requirements of Table 1.
5.1.2 Receiver RF performance requirements
The receiver RF performance indicators shall comply with the requirements of Table 2.
5.2.3 Electrostatic discharge immunity
The electrostatic discharge immunity test of the transceiver station in operating state shall
comply with the requirements of test level 4 in GB/T 17626.2-2006.
5.2.4 RF electromagnetic field radiation immunity
The RF electromagnetic field radiation immunity of the transceiver station and mobile station
shall comply with the requirements of test level 3 in 5.1 of GB/T 17626.3-2006.
5.2.5 Electrical fast transient pulse group (power port) immunity
The electrical fast transient pulse group (power port) immunity of the transceiver station shall
comply with the requirements of test level 3 in GB/T 17626.4-2008.During the test, the
transceiver station allows temporary loss or reduction of functions or performance. After the
test is stopped, the transceiver station shall be able to resume normal operating state by itself
without human intervention.
5.2.6 Surge (power port) (impact) immunity
The surge (impact) immunity of the transceiver station using AC power supply shall comply
with the requirements of test level 3 in GB/T 17626.5-2008.The surge (impact) immunity of
the transceiver station using DC power supply shall comply with the requirements of test level
2 in GB/T 17626.5-2008.During the test, the transceiver station allows temporary loss or
reduction of functions or performance. After the test is stopped, the transceiver station shall be
able to resume normal operating state by itself without human intervention.
The surge (impact) immunity of the mobile station shall comply with the requirements of test
level 2 in GB/T 17626.5-2008.During the test, the mobile station allows temporary loss or
reduction of functions or performance. After the test is stopped, the mobile station shall be
able to resume normal operating state by itself without human intervention.
5.4 Environmental Adaptability Requirements
5.4.1 Test criteria and configuration requirements
In the environmental adaptability test, basic electrical performance (carrier output power,
carrier frequency error and static sensitivity) is used as the performance criterion after the test.
In the environmental adaptability test of the portable station, the basic electrical performance
test uses the portable station’s standard battery.
5.4.2 Mechanical environmental adaptability
6 RF Performance Parameter Test Conditions and Test Methods
6.1 RF Performance Parameter Test Conditions
6.1.1 Test conditions
6.1.2 Test operating conditions
6.1.2.1 Test sample conditions
6.1.2.1.3 In principle, it is not allowed to open the casing for testing during the entire test
process. If it is necessary to open the casing for testing, it shall be stated in the test report.
6.1.2.1.4 When testing the spurious emission of the transmitter chassis port and the receiver
chassis port, replace the normally used antenna with a matching nominal load.
6.1.2.1.7 When the transceiver station is tested for electrical performance, it shall be powered
by an AC power supply with a nominal voltage of 220 V.
6.1.2.2 RF performance test frequency
When the PDT equipment is tested for electrical performance, the test frequency is selected
from the low-end frequency, intermediate frequency and high-end frequency of the operating
frequency range, respectively.
6.2.2 Test method for transmitter power (conducted)
Connect the test system as shown in Figure 1.The test equipment may be an RF power meter,
a comprehensive tester or a spectrum analyzer with RMS detection function. The test
procedure is as follows.
6.2.3 Test method for 4FSK modulation frequency deviation error
Connect the test system as shown in Figure 1.The test equipment may be a comprehensive
tester or a spectrum analyzer with vector analysis function. The test procedure is as follows.
6.2.5 Test method for occupied bandwidth
Connect the test system as shown in Figure 1.The test equipment may be a spectrum analyzer
with automatic bandwidth detection function. The test procedure is as follows.
6.3.2 Test method for static sensitivity
Connect the test system as shown in Figure 4.The wanted signal generator shall be a signal
generator that can generate D-M2 signals and output data sequences for comparison by the bit
error evaluation equipment. The equipment under test shall provide a demodulation output
data interface. The test procedure is as follows.
7 Electromagnetic Compatibility Test Methods
7.1 Conducted Disturbance
The conducted disturbance of the power terminals and telecommunication ports of transceiver
station equipment shall be tested in accordance with the measurement method for Class A
equipment in GB 9254-2008.
7.3 Electrostatic Discharge Immunity
The test configuration and test procedure for the electrostatic discharge immunity of
transceiver stations, portable stations and mobile stations in the operating state shall be tested
in accordance with the relevant provisions of GB/T 17626.2-2006.
7.4 RF Electromagnetic Field Radiation Immunity
The test configuration and test procedure for the RF electromagnetic field radiation immunity
of transceiver stations, mobile stations and portable stations shall be tested in accordance with
the relevant provisions of GB/T 17626.3-2006.During the test, the test sample shall be
powered on and debugged normally. Determine whether the results during and after the test
comply with the requirements of 5.2.4.
7.7 Conducted Disturbance Immunity of RF Induction (Power Port)
The test configuration and test procedure for the conducted disturbance immunity of the RF
induction (power port) of transceiver stations and mobile stations shall be tested in
accordance with the relevant provisions of GB/T 17626.6-2008.During the test, the test
sample shall be powered on and debugged normally. Determine whether the results during
and after the test comply with the requirements of 5.2.7.
7.8 Immunity to Voltage Sags, Short Interruptions and Voltage Variations (Power Port)
The test configuration and test procedure for the voltage sag, short interruption and voltage
variation of transceiver stations shall be tested in accordance with the relevant provisions of
GB/T 17626.11-2008.
8 Electrical Safety Test Methods
Test in accordance with the relevant provisions of GB 16796-2009.Determine whether the
test results comply with the requirements of 5.3.
9 Environmental Adaptability Test Methods
9.1 Test Methods for Mechanical Environmental Adaptability
9.1.1 Impact
The test configuration and test procedure for the impact of transceiver stations, mobile
stations and portable stations shall be tested in accordance with the relevant provisions of
GB/T 2423.5-1995.The mobile station, transceiver station and portable station are subjected
to impact tests according to the conditions specified in Table 9.Determine whether the results
during and after the test comply with the requirements of 5.4.2.1.
9.1.3 Vibration
The test configuration and test procedure for the vibration of transceiver stations, mobile
stations and portable stations shall be tested in accordance with the relevant provisions of
GB/T 2423.10-2008.
9.2 Test Methods for Climate and Environmental Adaptability
9.2.1 Low temperature (storage)
The test configuration and test procedure for the low temperature (storage) of transceiver
stations, mobile stations and portable stations shall be tested in accordance with test Ab in
GB/T 2423.1-2008.
9.2.2 Low temperature (operating state)
The test configuration and test procedure for the low temperature (operating state) of
transceiver stations and mobile stations shall be tested in accordance with test Ad in GB/T
2423.1-2008.
9.2.3 High temperature (storage)
The test configuration and test procedure for the high temperature (storage) of transceiver
stations, mobile stations and portable stations shall be tested in accordance with test Bb in
GB/T 2423.2-2008.The test sample is placed in a test chamber at room temperature in an
unpackaged and unpowered state.
9.2.7 Salt spray
The test configuration and test procedure for the salt spray of transceiver stations, mobile
stations and portable stations shall be tested in accordance with the relevant provisions of
GB/T 2423.17-2008 and the following procedures shall be followed.
9.3 Test Methods for Enclosure Protection Level
Test in accordance with the relevant provisions of GB 4208, and determine whether the results
comply with the requirements of 5.4.4.
9.4 Test Methods for Adaptability to Hazardous Environments
The portable stations operating in explosive gas environments are tested in accordance with
the relevant provisions of GB 3836.1 and GB 3836.4.Determine whether the test results
comply with the requirements of 5.4.5.
GA/T 1255-2016
GA
PUBLIC SECURITY INDUSTRY STANDARD
ICS 33.060.01
A 90
Police Digital Trunking Communication System - Technical
Requirements and Measurement Methods for Radio
Frequency Equipment
Issued on. SEPTEMBER 8, 2016
Implemented on. SEPTEMBER 8, 2016
Issued by. The Ministry of Public Security of the People’s Republic of China
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms, Definitions, Symbols and Abbreviations... 7
3.1 Terms and Definitions... 7
3.2 Symbols and Abbreviations... 10
4 Classification... 10
5 Requirements... 11
5.1 RF Performance Requirements... 11
5.2 Electromagnetic Compatibility Requirements... 13
5.3 Electrical Safety Requirements... 14
5.4 Environmental Adaptability Requirements... 14
6 RF Performance Parameter Test Conditions and Test Methods... 17
6.1 RF Performance Parameter Test Conditions... 17
6.2 Transmitter RF Performance Parameter Test Methods... 19
6.3 Receiver RF Performance Parameter Test Methods... 26
7 Electromagnetic Compatibility Test Methods... 34
7.1 Conducted Disturbance... 34
7.2 Radiated Disturbance... 34
7.3 Electrostatic Discharge Immunity... 34
7.4 RF Electromagnetic Field Radiation Immunity... 34
7.5 Electrical Fast Transient Pulse Group (Power Port) Immunity... 35
7.6 Surge (Power Port) (Impact) Immunity... 35
7.7 Conducted Disturbance Immunity of RF Induction (Power Port)... 35
7.8 Immunity to Voltage Sags, Short Interruptions and Voltage Variations (Power Port)... 35
8 Electrical Safety Test Methods... 35
9 Environmental Adaptability Test Methods... 35
9.1 Test Methods for Mechanical Environmental Adaptability... 35
9.2 Test Methods for Climate and Environmental Adaptability... 37
9.3 Test Methods for Enclosure Protection Level... 40
9.4 Test Methods for Adaptability to Hazardous Environments... 40
Appendix A (normative) Test Sites and Site Layout Guide for Radiation Test... 41
Appendix B (normative) General Test Methods for Radiated Spurious Emissions... 44
1 Scope
This Standard stipulates the terms, definitions, symbols and abbreviations, classification,
requirements and measurement methods for radio frequency equipment of the police digital
trunking communication system.
This Standard is applicable to the transceiver stations, mobile stations and portable stations of
the police digital trunking communication system, as well as their related systems and other
equipment.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 2423.1-2008 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Tests A. Cold
GB/T 2423.2-2008 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Tests B. Dry Heat
GB/T 2423.3-2006 Environmental Testing for Electric and Electronic Products - Part 2.
Testing Method - Test Cab. Damp Heat, Steady State
GB/T 2423.5-1995 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Test Ea and Guidance. Shock
GB/T 2423.8-1995 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Test Ed. Free Fall
GB/T 2423.10-2008 Environmental Testing for Electric and Electronic Products - Part 2.Tests
Methods - Test Fc. Vibration (Sinusoidal)
GB/T 2423.17-2008 Environmental Testing for Electric and Electronic Products - Part 2.Test
Methods - Test Ka. Salt Mist
3 Terms, Definitions, Symbols and Abbreviations
3.1 Terms and Definitions
3.1.1 Transceiver station
The combination unit of a transmitter that converts baseband signals into radio frequency
signals and a receiver that receives radio frequency signals from the antenna feed system and
restores them to baseband signals in a radio communication system.
3.1.2 Mobile station
A wireless intercom device with an external antenna interface, usually installed on vehicles
such as cars and ships and powered by them.
3.1.3 Portable station
A wireless intercom device with an external antenna interface, which is easy to carry
(hand-hold or wear) and powered by a built-in power supply of the device.
3.1.7 Non-weather-protected location
The place of activities directly affected by the weather.
3.1.8 Transmitter power (conducted)
The average power supplied to the transmission line by the transmitter equipped with an
antenna port in one RF cycle.
3.1.9 4FSK modulation frequency deviation error
The error ratio between the transmitter 4FSK code modulation frequency deviation and the
code modulation frequency deviation specified in GA/T 1056-2013.
3.1.10 4FSK transmitter bit error ratio
The bit error ratio of the signal transmitted by the transmitter.
3.2 Symbols and Abbreviations
The following symbols and abbreviations are applicable to this document.
4 Classification
The transceiver stations, mobile stations and portable stations of the police digital trunking
communication system (hereinafter referred to as the PDT equipment) are divided into the
following categories according to the applicable climate environment.
5 Requirements
5.1 RF Performance Requirements
5.1.1 Transmitter RF performance requirements
The transmitter RF performance indicators shall comply with the requirements of Table 1.
5.1.2 Receiver RF performance requirements
The receiver RF performance indicators shall comply with the requirements of Table 2.
5.2.3 Electrostatic discharge immunity
The electrostatic discharge immunity test of the transceiver station in operating state shall
comply with the requirements of test level 4 in GB/T 17626.2-2006.
5.2.4 RF electromagnetic field radiation immunity
The RF electromagnetic field radiation immunity of the transceiver station and mobile station
shall comply with the requirements of test level 3 in 5.1 of GB/T 17626.3-2006.
5.2.5 Electrical fast transient pulse group (power port) immunity
The electrical fast transient pulse group (power port) immunity of the transceiver station shall
comply with the requirements of test level 3 in GB/T 17626.4-2008.During the test, the
transceiver station allows temporary loss or reduction of functions or performance. After the
test is stopped, the transceiver station shall be able to resume normal operating state by itself
without human intervention.
5.2.6 Surge (power port) (impact) immunity
The surge (impact) immunity of the transceiver station using AC power supply shall comply
with the requirements of test level 3 in GB/T 17626.5-2008.The surge (impact) immunity of
the transceiver station using DC power supply shall comply with the requirements of test level
2 in GB/T 17626.5-2008.During the test, the transceiver station allows temporary loss or
reduction of functions or performance. After the test is stopped, the transceiver station shall be
able to resume normal operating state by itself without human intervention.
The surge (impact) immunity of the mobile station shall comply with the requirements of test
level 2 in GB/T 17626.5-2008.During the test, the mobile station allows temporary loss or
reduction of functions or performance. After the test is stopped, the mobile station shall be
able to resume normal operating state by itself without human intervention.
5.4 Environmental Adaptability Requirements
5.4.1 Test criteria and configuration requirements
In the environmental adaptability test, basic electrical performance (carrier output power,
carrier frequency error and static sensitivity) is used as the performance criterion after the test.
In the environmental adaptability test of the portable station, the basic electrical performance
test uses the portable station’s standard battery.
5.4.2 Mechanical environmental adaptability
6 RF Performance Parameter Test Conditions and Test Methods
6.1 RF Performance Parameter Test Conditions
6.1.1 Test conditions
6.1.2 Test operating conditions
6.1.2.1 Test sample conditions
6.1.2.1.3 In principle, it is not allowed to open the casing for testing during the entire test
process. If it is necessary to open the casing for testing, it shall be stated in the test report.
6.1.2.1.4 When testing the spurious emission of the transmitter chassis port and the receiver
chassis port, replace the normally used antenna with a matching nominal load.
6.1.2.1.7 When the transceiver station is tested for electrical performance, it shall be powered
by an AC power supply with a nominal voltage of 220 V.
6.1.2.2 RF performance test frequency
When the PDT equipment is tested for electrical performance, the test frequency is selected
from the low-end frequency, intermediate frequency and high-end frequency of the operating
frequency range, respectively.
6.2.2 Test method for transmitter power (conducted)
Connect the test system as shown in Figure 1.The test equipment may be an RF power meter,
a comprehensive tester or a spectrum analyzer with RMS detection function. The test
procedure is as follows.
6.2.3 Test method for 4FSK modulation frequency deviation error
Connect the test system as shown in Figure 1.The test equipment may be a comprehensive
tester or a spectrum analyzer with vector analysis function. The test procedure is as follows.
6.2.5 Test method for occupied bandwidth
Connect the test system as shown in Figure 1.The test equipment may be a spectrum analyzer
with automatic bandwidth detection function. The test procedure is as follows.
6.3.2 Test method for static sensitivity
Connect the test system as shown in Figure 4.The wanted signal generator shall be a signal
generator that can generate D-M2 signals and output data sequences for comparison by the bit
error evaluation equipment. The equipment under test shall provide a demodulation output
data interface. The test procedure is as follows.
7 Electromagnetic Compatibility Test Methods
7.1 Conducted Disturbance
The conducted disturbance of the power terminals and telecommunication ports of transceiver
station equipment shall be tested in accordance with the measurement method for Class A
equipment in GB 9254-2008.
7.3 Electrostatic Discharge Immunity
The test configuration and test procedure for the electrostatic discharge immunity of
transceiver stations, portable stations and mobile stations in the operating state shall be tested
in accordance with the relevant provisions of GB/T 17626.2-2006.
7.4 RF Electromagnetic Field Radiation Immunity
The test configuration and test procedure for the RF electromagnetic field radiation immunity
of transceiver stations, mobile stations and portable stations shall be tested in accordance with
the relevant provisions of GB/T 17626.3-2006.During the test, the test sample shall be
powered on and debugged normally. Determine whether the results during and after the test
comply with the requirements of 5.2.4.
7.7 Conducted Disturbance Immunity of RF Induction (Power Port)
The test configuration and test procedure for the conducted disturbance immunity of the RF
induction (power port) of transceiver stations and mobile stations shall be tested in
accordance with the relevant provisions of GB/T 17626.6-2008.During the test, the test
sample shall be powered on and debugged normally. Determine whether the results during
and after the test comply with the requirements of 5.2.7.
7.8 Immunity to Voltage Sags, Short Interruptions and Voltage Variations (Power Port)
The test configuration and test procedure for the voltage sag, short interruption and voltage
variation of transceiver stations shall be tested in accordance with the relevant provisions of
GB/T 17626.11-2008.
8 Electrical Safety Test Methods
Test in accordance with the relevant provisions of GB 16796-2009.Determine whether the
test results comply with the requirements of 5.3.
9 Environmental Adaptability Test Methods
9.1 Test Methods for Mechanical Environmental Adaptability
9.1.1 Impact
The test configuration and test procedure for the impact of transceiver stations, mobile
stations and portable stations shall be tested in accordance with the relevant provisions of
GB/T 2423.5-1995.The mobile station, transceiver station and portable station are subjected
to impact tests according to the conditions specified in Table 9.Determine whether the results
during and after the test comply with the requirements of 5.4.2.1.
9.1.3 Vibration
The test configuration and test procedure for the vibration of transceiver stations, mobile
stations and portable stations shall be tested in accordance with the relevant provisions of
GB/T 2423.10-2008.
9.2 Test Methods for Climate and Environmental Adaptability
9.2.1 Low temperature (storage)
The test configuration and test procedure for the low temperature (storage) of transceiver
stations, mobile stations and portable stations shall be tested in accordance with test Ab in
GB/T 2423.1-2008.
9.2.2 Low temperature (operating state)
The test configuration and test procedure for the low temperature (operating state) of
transceiver stations and mobile stations shall be tested in accordance with test Ad in GB/T
2423.1-2008.
9.2.3 High temperature (storage)
The test configuration and test procedure for the high temperature (storage) of transceiver
stations, mobile stations and portable stations shall be tested in accordance with test Bb in
GB/T 2423.2-2008.The test sample is placed in a test chamber at room temperature in an
unpackaged and unpowered state.
9.2.7 Salt spray
The test configuration and test procedure for the salt spray of transceiver stations, mobile
stations and portable stations shall be tested in accordance with the relevant provisions of
GB/T 2423.17-2008 and the following procedures shall be followed.
9.3 Test Methods for Enclosure Protection Level
Test in accordance with the relevant provisions of GB 4208, and determine whether the results
comply with the requirements of 5.4.4.
9.4 Test Methods for Adaptability to Hazardous Environments
The portable stations operating in explosive gas environments are tested in accordance with
the relevant provisions of GB 3836.1 and GB 3836.4.Determine whether the test results
comply with the requirements of 5.4.5.
......
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