Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by and is under the jurisdiction of the National Technical Committee on Radio Jamming of Standardization Administration of China (SAC/TC 79).
Limit and measurement methods of electromagnetic compatibility for private digital mobile radio equipment
1 Scope
This standard specifies the electromagnetic compatibility requirements and measurement methods of private digital mobile radio within the frequency range of 25~1,000MHz, which meet the relevant requirements of radio management.
This standard is applicable to private digital mobile radio base station/repeater, mobile station (on-board), portable station and other equipment.
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 6113.104 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-4: Radio disturbance and immunity measuring apparatus - Antennas and test sites for radiated disturbance measurements
GB/T 9254 Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement
GB 17625.1 Electromagnetic compatibility - Limits - Limits for harmonic current emissions (equipment input current ≤16A per phase)
GB/T 17625.2 Electromagnetic compatibility (EMC) - Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤16A per phase and not subject to conditional connection
GB/Z 17625.3 Electromagnetic compatibility - Limits - Limitation of voltage fluctuations and flicker in low-voltage power supply systems for equipment with rated current greater than 16 A
GB/T 17625.8 Electromagnetic compatibility - Limits - Limits for harmonic currents produced by equipment connected to public low-voltage systems with input current >16A and ≤75A per phase
GB/T 17626.2 Electromagnetic compatibility - Testing and measurement techniques - Electrostatic discharge immunity test
GB/T 17626.3 Electromagnetic compatibility - Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test
GB/T 17626.4 Electromagnetic compatibility - Testing and measurement techniques - Electrical fast transient/burst immunity test
GB/T 17626.5 Electromagnetic compatibility - Testing and measurement techniques - Surge immunity test
GB/T 17626.6 Electromagnetic compatibility - Testing and measurement techniques - Immunity to conducted disturbances induced by radio-frequency fields
GB/T 17626.8 Electromagnetic compatibility - Testing and measurement techniques - Power frequency magnetic field immunity test
GB/T 17626.11 Electromagnetic compatibility - Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests
GB/T 17626.29 Electromagnetic compatibility - Testing and measurement techniques - Voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests
GB/T 17626.34 Electromagnetic compatibility - Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests for equipment with mains current more than 16A per phase
GB/T 21437.2 Road vehicles - Electrical disturbances from conduction and coupling - Part 2: Electrical transient conduction along supply lines only
GB/T 28046.2 Road vehicles - Environmental conditions and testing for electrical and electronic equipment - Part 2: Electrical loads
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
private digital mobile radio
digital mobile radio with an external antenna port, which has a working frequency range of 25~1,000MHz, and is used as a private mobile communication network in the ground, inland river or coastal areas
Note: Private digital mobile radio includes base station/repeater, mobile station (on-board), portable station and other equipment.
3.1.2
base station
private digital mobile radio in mobile communication, which has an external antenna port, and is dedicated as a central station
3.1.3
repeater
private digital mobile radio transfer equipment with an external antenna port, which can enhance the signal and expand the communication range during the radio signal transmission by digital mobile radio
3.1.4
mobile station
private digital mobile radio with an external antenna port, which is usually installed on and powered by vehicles and ships, etc.
3.1.5
portable station
private digital mobile radio with an external antenna port, convenient for carrying (portable or wearing) and powered by the built-in power supply of the equipment
3.2 Abbreviations
For the purposes of this document, the following abbreviations apply.
AC: Alternating Current
BER: Bit Error Rate
DC: Direct Current
EMC: Electromagnetic Compatibility
EUT: Equipment under Test
ISN: Impedance Stabilization Network
LISN: Line Impedance Stabilization Network
RF: Radio Frequency
4 Test conditions
4.1 Equipment classification
Base station and repeater equipment shall meet the limit requirements of Class A equipment.
Portable station and mobile station (on-board) equipment shall meet the limit requirements of Class B equipment.
See GB/T 9254 for limit requirements of Class A and Class B equipment.
4.2 General conditions
EUT shall be tested under normal test environment, and the test layout shall be as close as possible to normal or typical actual operating state. The test conditions shall be recorded in the report.
For emission test:
——under normal working conditions, the test shall be carried out when EUT causes the greatest disturbance within the test frequency band;
——the measured continuous radiation disturbance shall be maximized, for example, through the cables of mobile equipment, etc.;
——all transmitters of the EUT shall transmit at full power;
——by setting the carrier frequency signal, the intermediate working frequency in EUT working frequency band shall be selected for test.
For immunity test: under normal working conditions, the test layout shall be as close as possible to normal or typical actual operating state.
If the EUT is a part of the system or connected with the ancillary equipment, it shall be connected with the ancillary equipment with the minimum typical configuration during the test, and the ports connected with the ancillary equipment shall be activated.
As for the immunity test of ancillary equipment, if there are no independent passing or failing criteria, the ancillary equipment shall be connected with transmitter, receiver or transceiver for judgment.
The working mode and configuration adopted in the test shall be accurately recorded in the test report.
If the equipment is provided with a large number of ports, a sufficient number of ports shall be selected to ensure that they can simulate the actual situation and different types of ports can be tested.
The port in normal working mode shall be connected to the ancillary equipment or connected to the terminal impedance of the analog ancillary equipment via cable.
The RF input and output ports shall be correctly terminated.
The cable connected to the antenna port or the terminated cable of the EUT shall not affect the test result.
The maintenance port does not need to be terminated unless required by the EUT in the test layout.
4.3 Test layout
Communication links shall be established with appropriate mobile station simulators or analog controllers (hereinafter referred to as "test system") according to different EUT configurations. The test system shall be placed outside the test environment.
When the EUT is in receiving/transmitting mode, the following conditions shall be met:
——the transmitter shall operate in the maximum output power state;
——appropriate measures shall be taken to avoid the influence of RF signal on the EUT in immunity test.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Terms and definitions
3.2 Abbreviations
4 Test conditions
4.1 Equipment classification
4.2 General conditions
4.3 Test layout
4.4 Test-free frequency band
4.5 Narrowband response of receiver
5 Performance evaluation methods
5.1 General principles
5.2 Evaluation process
6 Performance criteria
6.1 Performance criterion A
6.2 Performance criterion B
6.3 Performance criterion C
7 Applicability
7.1 Disturbance measurement
7.2 Immunity measurement
8 Measurement method and limit of disturbance test
8.1 Ancillary equipment chassis port
8.2 Telecommunication/control port
8.3 DC power input/output port
8.4 AC power input/output port
8.5 Harmonic current (AC power input port)
8.6 Voltage fluctuation and flicker (AC power input port)
8.7 Transient conducted disturbance (on-board environment)
9 Immunity test methods and grades
9.1 Electrostatic discharge immunity test
9.2 Radiated disturbance immunity test (80MHz~6GHz)
9.3 Electrical fast transient/burst immunity test
9.4 Surge (impact) immunity test
9.5 Immunity test for conducted disturbance induced by RF field
9.6 Power frequency magnetic field immunity test
9.7 Immunity test of voltage dip, short interruption and voltage variation
9.8 Transient and surge immunity test (on-board environment)
Bibliography
