NATIONAL TECHNICAL REGULATION ON ELECTROMAGNETIC COMPATIBILITY FOR RADIO EQUIPMENT

1. GENERAL PROVISIONS

1.1. Scope of regulation

This regulation specifies general electromagnetic compatibility (EMC) requirements for radio and related auxiliary equipment, excluding broadcast receiver equipment.

Technical specifications relating to radio equipment antenna ports and radiated emissions from radio equipment enclosure ports and radio equipment assemblies and auxiliary equipment are not within the scope of regulation of this regulation.

The appropriate EMC test arrangements and evaluation methods for each type of radio equipment are specified in the relevant Specific condition sections of the ETSI EN 301 489 series of standards.

In case of differences (e.g. in special conditions, definitions, abbreviations) between this Regulation and the provisions in the relevant Specific conditions in the parts of the ETSI EN 301 489 standard series, apply Relevant Specific conditions section of the ETSI EN 301 489 series of standards.

In case there are no technical regulations regulating specific conditions for specific radio equipment/services, for example, in the case of new creation of a wireless service or a specific application, this Regulation can be used together with the specific information of the radio equipment provided by the manufacturer to check EMC requirements as stated in this Regulation.

HS codes of equipment within the scope of this regulation are specified in Appendix G.

1.2. Applicable subjects

This technical regulation applies to Vietnamese and foreign agencies, organizations and individuals that have production, business and exploitation activities of equipment within the scope of this Regulation in the territory of Vietnam.

1.3. References

QCVN 118:2018/BTTTT, National technical regulation on electromagnetic compatibility for multimedia equipment - Emission requirements.

TCVN 7909-4-2:2015 Electromagnetic compatibility (EMC) - Part 4-2: Measurement and testing methods - Immunity test for electrostatic discharge phenomenon.

TCVN 7909-4-3:2015 Electromagnetic compatibility (EMC) - Part 4-3: Measurement and testing methods - Immunity test for radio frequency radiated electromagnetic fields.

IEC 61000-4-4:2012 Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test.

IEC 61000-4-5:2014/AMD1:2017 Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test

IEC 61000-4-11:2004 Electromagnetic compatibility (EMC) - Part 4-11: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests.

ISO 7637-2 (2011), Road vehicles - Electrical disturbances from conduction and coupling - Part 2: Electrical transient conduction along supply lines only.

IEC 61000-3-3:2013/A1:2017 Electromagnetic compatibility (EMC) - Part 3-3: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current < 16 A per phase and not subject to conditional connection.

CISPR 25, Radio disturbance characteristics for the protection of receivers used on board vehicles, boats, and on equipment - Limits and methods of measurement.

IEC 61000-3-12:2011 Electromagnetic compatibility (EMC) - Part 3-12: Limits - Limits for harmonic currents produced by equipment connected to public low-voltage systems with input current > 16 A and < 75 A per phase.

IEC 61000-3-11:2000 Electromagnetic compatibility (EMC) - Part 3-11: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems - Equipment with rated current < 75 A and subject to conditional connection.

EN 50561-3 (2016): Power line communication apparatus used in low-voltage installations - Radio disturbance characteristics - Limits and methods of measurement - Part 3: Apparatus operating above 30 MHz.

EN 50561-1:2013/AC:2015 Power line communication apparatus used in low-voltage installations - Radio disturbance characteristics - Limits and methods of measurement - Part 1: Apparatus for in-home use.

IEC 61000-3-2:2014 Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic current emissions (equipment input current < 16 A per phase).

IEC 61000-4-34:2005/A1:2009 Electromagnetic compatibility (EMC) - Part 4-34: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests for equipment with mains current more than 16 A per phase.

1.4. Interpretation

1.4.1. Auxiliary equipment

Equipment used in connection with a receiver or transmitter.

NOTE 1: A equipment is considered an auxiliary equipment when:

• Equipment used in conjunction with a receiver or transmitter to provide additional operating and/or control features to the radio equipment (e.g. to extend control to another location or area ); and
• The equipment cannot be used alone to provide independent use of a receiver or transmitter; and
• The receiver/transmitter to which it is connected is capable of performing some intended operation such as transmitting and/or receiving without the need for auxiliary equipment (i.e. it is not a sub-block of the main equipment necessary to maintain the basic function of the main equipment).

1.4.2. Antenna port

Port for connecting an antenna to transmit and/or receive radiated RF energy.

1.4.3. Associated equipment

Equipment necessary to perform and/or monitor EUT operations.

1.4.4. Base station equipment

Radio and/or auxiliary equipment used at a fixed location and powered directly or indirectly (i.e. via mains or AC/DC converter) by the mains or local DC mains network.

1.4.5. Broadcast receivers

The equipment contains a navigator used to receive broadcast services.

NOTE: These broadcasting services are usually radio and television broadcasting services, including terrestrial and satellite broadcasting services.

1.4.6. Conditional connection

The equipment connection requires that the user's supply impedance at the interface point be lower than the Zref impedance so that the equipment's emissions comply with the limits in IEC 61000-3-11.

NOTE: Meeting the voltage change limits is not the only condition for connection; Emission limits may have to be met for other phenomena such as harmonics.

1.4.7. Continuous phenomena

Electromagnetic interference whose effects on a particular equipment or equipment cannot be classified among the known effects.

NOTE: See IEC 60050-161.

1.4.8. Enclosure port

The physical boundary of a equipment into which electromagnetic fields can radiate and influence.

NOTE: In the case of equipment with integral antennas, this port is not isolated from the antenna port

1.4.9. Exclusion band

Frequency range(s) are not tested or evaluated

1.4.10. Fixed-use

Use the equipment in a permanent location or where the connection to the AC power adapter is based on temporary platforms.

1.4.11. Integral antenna

The antenna is designed to be permanently connected to the equipment and is considered part of the connection port. NOTE: The integrated antenna can be mounted internally or externally.

1.4.12. Multi-radio equipment

Radio equipment consisting of two or more transmitters and/or receivers, using different technologies that can operate simultaneously.

Figure 1 - Multi-radio equipment

1.4.13. Multi-standard radio equipment

A radio equipment with a receiver and transmitter that can handle two or more carriers simultaneously in RF components operating together over a specific bandwidth with at least one carrier that is technologically different from one other carrier(s).

Figure 2 - Multi-standard radio equipment

1.4.14. Occupied bandwidth

width of the frequency range over which the average transmitted power is below the lower frequency limit and the upper frequency limit equal to a defined percentage B/2 of the total average power of a given emission; Unless otherwise stated for the appropriate type of emission, the value of B/2 should be taken as 0,5 %.

1.4.15. Operating frequency range

The radio band(s) is defined by the equipment under test (EUT) in its entirety.

1.4.16. Port

Specific interface of the known equipment to the electromagnetic environment.

NOTE 1: For example, any connection point on an equipment used to connect cables to/from the equipment is considered a port (see Figure 3).

Figure 3 - Example of ports

NOTE 2: Interfaces that use only non-conductive sheathed optical fibers are not ports for testing purposes because it does not interact with the electromagnetic environment in the frequency range, the frequency range applicable to this Regulation. Fiber optic interfaces can still be used for performance evaluation.

NOTE 3: In the case of equipment with integral antennas, the antenna port is the enclosure port.

1.4.17. Portable equipment

The radio and/or auxiliary equipment for mobile operation (e.g. portable equipment) uses its own battery power source.

NOTE: The equipment is usually portable.

1.4.18. Radio equipment

Electrical or electronic products that emit and/or receive radio waves for radio communications and/or radio transmitters, or an electrical or electronic product must have an accessory such as an antenna to radiate and/or receive radio waves for radio communication and/or radio broadcast

NOTE: The equipment may operate with auxiliary equipment, but in that case it is not dependent on the auxiliary equipment for its basic function.

1.4.19. Removable antenna

The antenna can be removed during testing according to the manufacturer's announcement.

1.4.20. Signal/control port

Port for connecting the components of the EUT, or between the EUT and the AE, and used according to the relevant specifications (e.g. maximum length of the cable connected to it)

1.4.21. Test jig

Associated equipment (AE) to support the EUT during testing according to its intended use.

1.4.22. Transient phenomena

The phenomenon of changing between two consecutive steady states within a short period of time compared to the time period under consideration.

Note: See IEC 60050-16.

1.4.23. Vehicle use

Radio equipment for installation and use on vehicles and powered by the vehicle's main battery.

1.4.24. Wired network port

A wired network port is a connection point for transferring voice, data and signaling signals to link wide-area distributed systems by direct connection to a single-user or multi-user communication network (e.g. cable television network (CATV), public switched telecommunications network (PSTN), integrated multi-service digital network (ISDN), digital subscriber line (xDSL), local area networks (LANs) and similar networks).

NOTE: This port can support shielded or unshielded cables and can also transmit AC or DC electrical energy; it is an integral part of telecommunications specifications.

1.5. Symbol

β Bandwidth

Band_rx (lower) Lower limit of the frequency range of the receiver under evaluation

Band_rx (upper) Upper limit of the frequency range of the receiver under evaluation

BW_RX Receiver frequency table width (or receiver within a transceiver)

ChW_RX Receiver channel width (or receiver in transceiver)

Exband (lower) Lower limit of the exclusion band

Exband (upper) Upper limit of the exclusion band

1.6. Abbreviation

2. TECHNICAL REGULATIONS

2.1. EMC emissions

2.1.1. Applicability of emission measurements

Table 1 lists the emission measurements for the radio equipment and/or associated auxiliary equipment that must be tested.

Table 1- Emission requirements

2.1.2. Measurement configuration

Perform conducted emission measurements for all radio equipment with wired connections.

It is not mandatory to perform radiated emission measurements on the antenna port and/or enclosure port (see 2.1.3) for radio equipment.

• Perform measurements when the EUT is working properly and in the mode that produces the largest emissions in the band under investigation;
• Must set up the equipment configuration in normal operating mode as in reality;
• If the equipment under test is part of a system or connected to auxiliary equipment, the equipment shall be measured when connected to the auxiliary equipment with the minimum representative configuration necessary to test the ports;
• If the equipment has multiple ports, a sufficient number of ports must be selected to simulate actual operating conditions and to ensure testing of all different types of terminations;
• Must connect port to or to the piece of equipment to which, in normal operation, it is connected, or to cable lengths with suitable terminations to simulate the impedance of the equipment to which they are connected.
• The configuration and operating mode of the equipment during testing must be recorded in the measurement report.

2.1.3. Emission from enclosure port

2.1.3.1. General

This measurement applies only to the enclosure port of an auxiliary equipment not incorporated in the radio equipment and is evaluated independently of its associated radio equipment.

Perform measurements on a configuration representative of the auxiliary equipment.

2.1.3.2. Measurement methods

The measurement method must comply with QCVN 118:2018/BTTTT, Article 2.2.

2.1.3.3. Limit

Auxiliary equipment must satisfy the limits for type B equipment specified in Table 4 and Table 5 of QCVN 118:2018/BTTTT.

Additionally, for auxiliary equipment used only in industrial environments or telecommunications centers, the equipment must meet the emission limits for Class A equipment specified in Table 2 and Table 3 of QCVN 118:2018/BTTTT.

2.1.4. Emission from DC power input/output ports

2.1.4.1. General

This measurement is applicable only to radio equipment and auxiliary equipment for fixed use intended for connection to an adjacent DC main or to an internal battery with a connection cable longer than 3 m (see Appendix E).

If the DC power cable of the radio and/or auxiliary equipment is shorter than or equal to 3 m, use it for direct connection to a separate AC/DC power supply, the measurement must be performed on the AC power input port of the power supply as specified in 2.1.5. If this DC power cable is longer than 3 m, additional measurements must be made on the DC power port of the mobile radio and/or auxiliary equipment.

If the DC power cable between the radio and/or auxiliary equipment and the separate DC/DC power converter is shorter than or equal to 3 m, the measurement can be limited to the DC power input port of this power converter. If the DC power cable is longer than 3 m, measurements must be additionally performed on the DC power port of the mobile radio and/or auxiliary equipment.

This measurement shall be performed on a representative configuration of the radio equipment, associated auxiliary equipment or a representative configuration of a combination of radio equipment and auxiliary equipment.

This measurement is intended to evaluate the level of internal electrical noise present on the DC power input/output ports.

2.1.4.2. Measurement methods

For mobile radio equipment and auxiliary equipment connected to the vehicle's DC mainboard, an artificial network (AN) as specified in CISPR 25 shall be used and connected to the DC power source.

For all other equipment, apply the requirements specified in 2.3, QCVN 118:2018/BTTTT to measure the AC mains port.

The measuring frequency range extends from 150 kHz to 30 MHz. When the EUT is a transmitter operating on frequencies below 30 MHz, the transmitter exclusion frequency range (see A.3, Annex A) is applicable for measurements in transmit mode.

For emission measurements on DC output ports, the relevant port needs to be connected to the power consuming load via AMN/AN.

2.1.4.3. Limit

The equipment must meet the following conducted emission limit values including average and quasi-peak limits corresponding to using an average detector receiver, a quasi-peak detector receiver and suitable measurements as described in measurement method section 2.1.4.2 above. If the averaging limit is met using a quasi-peak detector, the equipment shall be considered to satisfy both limits and it is not necessary to perform measurements with an averaging detector.

The equipment must meet the limits in Table 2 below.

Table 2 - Conducted emission limits

2.1.5. Emission from AC power input/output port

2.1.5.1. General

This measurement applies to radio equipment and/or auxiliary equipment for fixed use supplied with AC mains power.

This measurement shall be performed on a configuration that is representative of the radio equipment, associated auxiliary equipment, or a configuration that is representative of a combination of radio equipment and auxiliary equipment.

This measurement evaluates the level of internal electrical noise present on the AC mains input/output ports.

2.1.5.2. Measurement methods

The measurement method must comply with QCVN 118:2018/BTTTT, article 2.3 and use an artificial power network (AMN) to connect to the AC mains power source.

The measuring frequency range extends from 150 KHz to 30 MHz. When the EUT is a transmitter operating at frequencies below 30 MHz, the transmitter's exclusion frequency range (see Annex A section A.3) is applicable for measurements in transmit mode.

For emission measurements at the AC output ports of the EUT, the relevant port must be connected via the AMN to the power consuming load. In the case where the AC output port is connected directly (or via a circuit breaker) to the AC power input port of the EUT, there is no need to test the AC power output port.

2.1.5.3. Limit

2.1.5.3.1. General

The equipment shall meet the following values including average limits and corresponding quasi-peak limits when using an averaging receiver, a quasi-peak detector and appropriate measurements as described in measurement method 2.1.5.2 above. If the average limit is met using a quasi-peak detector, then the equipment is considered to meet both limits and measurements with the average detector need not be made.

2.1.5.3.2. The AC power port is only used for power supply

The equipment must meet the emission limits for class B equipment specified in Table 10, QCVN 118 2018/BTTTT.

For equipment used only in industrial environments or telecommunications centers, the emission limits for Class A equipment specified in Table 9, QCVN 118:2018/BTTTT must apply.

2.1.5.3.3. The AC power input port is also used for PLC information

When the equipment's AC power port is also used for PLC communications between 1.6 MHz and 30 MHz, the EUT shall comply with the requirements in Clause 6 of EN 50561- 1:2013/AC:2015, in lieu of the requirements contained in 2.1.5.3.2 of this Regulation.

When the equipment's AC power port is also used for PLC information > 30 MHz, the EUT shall comply with the requirements in Clause 6 of EN 50561-3, which supersede the requirements contained in 2.1.5.3.2 of this Regulation.

2.1.6. Harmonic current emission (AC mains input port)

For equipment with input currents up to and including 16 A per phase, according to the classification in Clause 5 of IEC 61000-3-2:2014, the limits in Clause 7 of IEC 61000-3-2:2014, and the assessment requirements in Clause 6 of IEC 61000-3-2:2014 apply.

For equipment with input currents greater than 16 A per phase, the limits for harmonic current emissions according to Clause 5 of IEC 61000-3-12:2011 and the assessment requirements in Clause 7 of IEC 61000-3-12:2011 apply.

2.1.7. Flickering and voltage fluctuations (AC mains input port)

For equipment with input currents up to and including 16 A per phase, if conditional connection is not required, the limits of Clause 5 of IEC 61000-3- 3:2013/A1:2017 apply, and the assessment requirements in Clause 6 of IEC 61000-3- 3:2013/A1:2017.

For equipment with input currents up to and including 16 A per phase, a conditional connection is required and for equipment with input currents greater than or equal to 16 A and including 75 A per phase, the limits in Clause 5 of IEC 61000-3-11 apply together with the assessment requirements in Clause 6 of IEC 61000-3-11.

2.1.8. Emission from wired network port

2.1.8.1. General

This test applies to radio equipment and/or auxiliary equipment for fixed use, with wired network ports.

This measurement shall be performed on a configuration that is representative of the radio equipment, associated auxiliary equipment, or a configuration that is representative of a combination of radio equipment and auxiliary equipment.

This test evaluates the level of unwanted emissions at wired network ports.

2.1.8.2. Measurement methods

The measurement method must comply with QCVN 118:2018/BTTTT, Article 2.3.

The test frequency range extends from 150 KHz to 30 MHz. When the EUT is a transmitter operating at frequencies below 30 MHz, the transmitter exclusion band (see A.3, Appendix A) is applicable for the transmitter mode measurements.

2.1.8.3. Limit

The wired network port must meet the emission limits for class B equipment in Table 12, QCVN 118:2018/BTTTT.

In addition, for equipment used only in industrial environments or telecommunications centers, the emission limits for class A equipment in Table 11, QCVN 118:2018/BTTTT apply.

2.2. Immunity

2.2.1. Applicability of immunity tests

Immunity tests for radio equipment and/or related auxiliary equipment are specified in Table 4.

Table 4 - Immunity requirements

2.2.2. Test configuration

This section sets out the configuration requirements for immunity testing as follows:

• The immunity test shall take into account the test conditions specified in Appendix A;
• The test must be performed within the prescribed operating environment and the equipment is supplied with rated power;
• If the equipment is part of a system or connected to an auxiliary equipment, the equipment shall be tested while connected to the auxiliary equipment with a minimum representative configuration sufficient to test the ports;
• If the equipment has an integral antenna, the equipment shall be tested with the antenna in normal operation;
• For auxiliary equipment immunity tests without separate pass/fail criteria, use the evaluation results of the receiver or transmitter coupled to the auxiliary equipment to consider whether the auxiliary equipment passes or fails the immunity test;
• If the equipment has multiple ports, enough ports must be selected to simulate actual operating conditions and to ensure testing of all different types of terminations;
• Ports that are not connected to a cable during normal operation, such as service ports, programming ports, temporary ports, etc., will not be connected to any cable during EMC testing. If it is necessary to connect cables to these ports or to extend internal connection cables to test the EUT, precautions must be taken to not affect the evaluation of the EUT;
• The configuration and operating mode of the equipment during the test must be recorded in the measurement report.

2.2.3. Immunity to radio frequency electromagnetic fields (80 MHz to 6 000 MHz)

2.2.3.1. General

This test applies to radio equipment and related ancillaries.

The test shall be carried out on a configuration that is representative of the radio equipment, associated auxiliary equipment, or a configuration that is representative of a combination of radio equipment and auxiliary equipment.

This test evaluates the ability of the EUT to operate normally in the presence of radio frequency electromagnetic field disturbances.

2.2.3.2. Test method

The measurement method must comply with TCVN 7909-4-3:2015.

Apply the following requirements and evaluate the test results:

• Test level (test field strength) is 3 v/m (measured without modulation). The test signal shall be amplitude modulated with a modulation depth of 80 % by a 1 000 Hz sinusoidal audio signal. If the wanted signal is modulated at 1 000 Hz, a 400 Hz audio signal shall be used.
• Tests shall be performed over the frequency range 80 MHz to 6000 MHz, applying appropriate exclusion bands for transmitters, receivers and duplex transceivers (see A.3, Appendix A).
• Stepwise increase in frequency is 1% of the current operating frequency;
• The dwell time of the immunity test phenomenon at each frequency must not be less than the time needed to test the EUT and the time it takes the EUT to respond.

NOTE: Dwell time depends on the equipment.

• Must record in the test report the frequencies selected and used in the test

2.2.3.3. Quality criteria

Quality criteria for continuous phenomena must be applied (as specified in C.2, Appendix C).

2.2.4. Immunity to electrostatic discharge

2.2.4.1. General

This test applies to radio equipment and related ancillaries.

This test shall be performed on a configuration representative of the radio equipment, associated auxiliary equipment, or a configuration representative of a combination of radio equipment and auxiliary equipment.

This test evaluates the ability of the EUT to operate normally in the event of electrostatic discharge.

2.2.4.2. Test method

Complies with the requirements of Clauses 6, 7 and 8 of IEC EN 61000-4-2: 2009.

For radio and auxiliary equipment, apply the requirements and evaluate the test results below:

The level of test level (test voltage level) for contact discharge must be ±4 kV, air discharge must be ±8 kV. All other details include average test levels according to TCVN 7909-4-2:2015.

Apply the electrostatic discharge test to all exposed surfaces of the EUT unless the instructions for use specify requirements for appropriate protective measures (as specified in 8 3 2 and 8.3.3 of IEC EN 61000-4-2: 2009).

2.2.4.3. Quality criteria

Quality criteria for continuous phenomena must be applied (as specified in C.2, Appendix C).

2.2.5. Immunity to surge, general mode

2.2.5.1. General

This test must be performed on the AC mains power port (if any) of the radio and associated auxiliary equipment.

This test shall also be performed on the signal ports, information ports, control ports, and DC power ports of the radio equipment and related auxiliary equipment if the connecting cables are longer than 3 m.

In the case of ports that cannot be used with cables longer than 3 m, this test should not be performed on those ports, and these ports must be listed in the test report.

This test evaluates the ability of the EUT to operate normally in the event of a rapid surge on one of the input/output ports.

2.2.5.2. Test method

The measurement method must comply with IEC 61000-4-4:2012.

Apply the following requirements and evaluate the test results:

• The test level for signal ports, wired network ports (including xDSL networks) and control ports must be an open circuit voltage of 0.5 kV with a repetition frequency of 5 kHz as specified in Clause 5 of IEC 61000- April 4:2012.
• The test level for the xDSL wired network port must be an open circuit voltage of 0.5 kV with a repetition frequency of 100 kHz as specified in Clause 5 of IEC 61000-4-4:2012.
• The test level for the DC power input port shall be an open circuit voltage of 0.5 kV with a repetition frequency of 5 kHz as specified in Clause 5 of IEC 61000-4-4:2012.
• The test level for the AC mains input port shall be an open circuit voltage of 1 kV with a repetition frequency of 5 kHz as specified in Clause 5 of IEC 61000-4-4:2012.

2.2.5.3. Quality criteria

Apply quality criteria for surges (according to C.3, Appendix C).

2.2.6. Immunity to radio frequency, common mode

2.2.6.1. General

This test must be performed on the AC mains power port (if any) of the radio and associated auxiliary equipment.

This additional test shall be performed on the signal ports, wire network ports, control ports, and DC power ports of the radio equipment and related auxiliary equipment if the connecting cables are longer than 3 m.

In the case of ports that cannot be used with extension cables longer than 3 m, do not perform this test on those ports, and these ports must be listed in the test report.

This test shall be performed on a configuration representative of the radio equipment, associated auxiliary equipment, or a configuration representative of a combination of radio equipment and auxiliary equipment.

This test evaluates the ability of the EUT to operate normally in the presence of radio frequency electromagnetic interference on the input/output ports.

2.2.6.2. Test method

The measurement method must comply with TCVN 7909-4-6:2015.

Apply the following requirements and evaluate the test results:

• The test level must be level 2 as in TCVN 7909-4-6:2015 corresponding to 3V rms without modulation. The test signal shall be amplitude modulated with a modulation depth of 80 % by a 1 000 Hz sinusoidal signal. If the wanted signal is modulated at 1 000 Hz, a test signal modulated at 400 Hz shall be used.
• The test shall be performed over the frequency range 150 kHz to 80 MHz except for the exclusion bands for transmitters, receivers and duplex transceivers (see Appendix A).
• For receivers and transmitters, the frequency gain must be 1% of the current frequency gain value in the frequency range 150 kHz to 80 Mhz;
• Injection method must be selected in accordance with TCVN 7909-4-6:2015.
• Responses on the receiver or on the receiver part of the transceiver occurring at discrete frequencies are narrowband responses (spurious responses) which are ignored when performing the test (see Appendix A).

The dwell time of the immunity test at each frequency shall not be less than the time required to test the EUT and the time it takes the EUT to respond.

• The frequencies of the immunity test signals selected and used in the test must be recorded in the test report.

2.2.6.3. Quality criteria

Quality criteria for continuous phenomena must be applied (according to C.2, Appendix C).

2.2.7. Immunity to surges and overvoltages in the transport environment

2.2.7.1. General

This test applies to radio and auxiliary equipment used in vehicles.

This test shall be performed on the nominal 12 V and 24 V DC power input ports of mobile and auxiliary radio equipment also used mobile in vehicles.

This test shall be performed on a configuration that is representative of the mobile radio equipment, associated auxiliary equipment, or a configuration that is representative of a combination of radio and auxiliary equipment.

This test evaluates the ability of the EUT to operate properly in the event of surges and overvoltages on the equipment's DC power input ports in a vehicle environment.

2.2.7.2. Test method

The measurement method must be in accordance with ISO 7637-2:2004 for 12 V and 24 V DC power equipment.

The test method must comply with ISO 7637-2:2004 when using pulse types 1, 2a, 2b, 3a, 3b, 4 and using immunity test level III. For EMC testing purposes, it is necessary to perform 10 tests for each pulse type: 1, 2a, 2b, 4 and apply a duration of 20 minutes for each pulse type 3a, 3b.

2.2.7.3. Quality criteria

When using pulses 3a and 3b, the quality criteria for continuity phenomena apply (see c.2, Appendix C).

When using pulses 1, 2a, 2b, 4, apply quality criteria for surge phenomena (see C.3, Appendix C), except that the communications link need not be maintained during EMC exposure and may require re-establishment.

2.2.8. Immunity to Voltage dips and interruptions

2.2.8.1. General

This test must be performed on the AC mains power port (if any) of the radio equipment and associated auxiliary equipment.

This test shall be performed on a configuration representative of the radio equipment, associated auxiliary equipment, or a configuration representative of a combination of radio equipment and auxiliary equipment.

This test evaluates the ability of the EUT to operate normally in the event of Voltage dips and voltage interruptions on the AC mains input port.

2.2.8.2. Test method

Apply the following requirements and evaluate the test results:

Compliant with IEC 61000-4-11 or IEC 61000-4-34:2005/A1:2009 for equipment requiring supply current greater than 16 A.

The test levels should be:

- Voltage dip: 0 % remaining voltage for 0.5 cycles;

- Voltage dip: remaining voltage is 0% for 1 cycle;

- Voltage dip: remaining voltage 70 % for 25 cycles (with 50 Hz);

- Voltage interruption: remaining voltage 0 % for 250 cycles (with 50 Hz).

2.2.8.3. Quality criteria

For Voltage dip tests, 0 % remaining voltage, the following quality criteria for Voltage dip apply:

• Apply quality criteria for surges (see C.3, Appendix C).

For Voltage dip and voltage interruption tests, the remaining voltage of 70 % applies the following quality criteria:

• In case the equipment is equipped or connected to a backup battery source, the quality criteria for surge phenomena specified in C.3, Appendix C apply.
• In case the equipment is only powered from the mains network (do not use backup battery power) frequently changed user data may be lost and if so there is no need to maintain a communication link and lost functions may be restored by the user or operator;
• There shall be no unintended responses at the end of the test, when the voltage is restored to the rated level;
• In case of loss of functions or loss of user data, these factors must be recorded in the test report.

2.2.9. Immunity to overpressure

2.2.9.1. General

This test shall be performed on the AC mains power port (if any) of the radio equipment and associated auxiliary equipment.

This additional test must be performed on wired network ports, if any.

This test shall be performed on a configuration representative of the radio equipment, associated auxiliary equipment, or a configuration representative of a combination of radio equipment and auxiliary equipment.

This test evaluates the ability of the EUT to operate normally when overvoltage occurs on the AC mains input ports and wired network ports.

2.2.9.2. Test method

2.2.9.2.1. General

Complies with requirements in Clauses 7 and 8 of IEC 61000-4-5:2014/AMD1:2017.

The requirements and evaluation of test results stated in 2.2.9.2.2 (wired network ports, outdoor cables), 2.2.9.2.3 (wired network ports, indoor cables) and 2.2 shall be applied. 9.2.4 (mains ports), but does not require a test where the normal function cannot be performed due to the action of the CDN decoupling circuit on the EUT.

2.2.9.2.2. Test method for wired network ports connected directly to outdoor cables

The test level applicable to a wired network port operating symmetrically connected directly to an outdoor cable must be 1 kV (applied to wire-to-ground) as specified in Clause 5 of IEC 61000- 4-5:2014/AMD1: 2017. The test signal generator must provide 10/700 μs pulses as specified in A.2 AnnexA of EC 61000-4-5:2014/AMD1:2017.

The test level for applying asymmetrical wired network ports directly connected to the telecommunications network by outdoor cables must be 1 kV (apply wire-to-ground, or screened to ground) and 0.5 kV (apply wire-to-wire use) as specified in Article 5 of CENELEC EN 61000-4-5: 2014, A1:2017. The test signal generator must provide 1.2/50 μs pulses as specified in 6.2 of IEC 61000-4-5:2014/AMD1:2017.

The output impedance of the overvoltage generator must comply with the provisions of 6.2 and A.2 Annex A of IEC 61000-4-5:2014/AMD1:2017.

2.2.9.2.3. Test method for wired network ports connected to indoor cables

The test level applied to wired network ports used to connect to indoor cables (cable length more than 30 m) must be 0.5 kV (apply wire-to-ground, or screened to ground). In this case, the total output impedance of the overvoltage generator including the CDN circuit must comply with the provisions of 6.2 and 6.3 of IEC 61000-4-5:2014/AMD1:2017. The test signal generator must provide 1.2/50 μs pulses as specified in 6.2 of IEC 61000-4- 5:2014/AMD1.2017.

2.2.9.2.4. Test method for mains power ports

The test level applicable to the mains input ports shall be 2 kV line-to-ground and 1 kV line-to-line with the output impedance of the overvoltage generator including the CDN circuit as specified in 6.2 and 6.3 of IEC 61000- 4-5:2014/AMD1:2017.

In telecommunications centers, a test level of 1 kV line-to-ground and 0.5 kV line-to-line must be used.

The test signal generator must provide 1.2/50μs pulses as specified in 6.2 of IEC 61000-4-5:2014/AMD1:2017.

2.2.9.3. Quality criteria

Apply quality criteria for voltage surges (see C.3, Appendix C).

3. REGULATIONS FOR MANAGEMENT

3.1. Radio equipment and related ancillaries within the scope of regulation specified in 1.1 must comply with the technical regulations in this Regulation.

3.2. In cases where radio equipment has its own technical regulations, any technical specifications related to antenna ports and equipment enclosure ports in that technical regulation shall prevail over the corresponding technical specifications in this Regulation. The remaining technical specifications of this Regulation must still be applied to evaluate the EMC compliance of the equipment.

4. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

Relevant organizations and individuals are responsible for declaring conformity and are subject to inspection by state management agencies according to current regulations.

5. IMPLEMENTATION ORGANIZATION

5.1. The Authority of Telecommunications and the Departments of Information and Communications are responsible for guiding and organizing the implementation and management of public land mobile base stations according to this Regulation.

5.2. This regulation is applied to replace QCVN 18:2014/BTTTT, National technical regulations on electromagnetic compatibility for radio equipment.

5.3. In case the regulations stated in this Regulation are changed, supplemented or replaced, the provisions in the new document shall comply.

5.4. During the implementation of this Regulation, if any problems or difficulties arise, relevant organizations and individuals should report in writing to the Ministry of Information and Communications (Department of Science and Technology) for guidance and solutions./.

Appendix A

(Regulations)

Testing conditions

A.1. General

The measurement configuration and operating mode representative of the intended use of the equipment shall be recorded in the test report.

A.2. Arrangement of test signals

A.2.1. General

Independent transmitters and receivers must be tested separately. Transceiver equipment must be tested to confirm each direction of operation of the equipment.

A.2.2. Arrangement of test signal at the transmitter input

The transmitter must be tested with a signal that shows the intended use of the EUT.

When the test signal is generated by an external source, the signal source must be located outside the test environment.

A.2.3. Arrangement of test signal at the transmitter RF output

The equipment (AE) monitoring the desired RF output signal from the transmitter under test must be located outside the test environment.

For transmitters with integral antennas, the desired RF output signal to establish a communication link must be provided by the EUT to the measurement antenna located within the measurement environment. This antenna must be connected to the output (AE) monitoring equipment in a manner that is not affected by signals within the test environment.

For transmitters with removable antennas, the desired RF output signal to establish a communication link must be supplied from the antenna connector to the monitoring equipment (AE) using a shielded conductor such as a coaxial cable.

The level of the desired RF output signal in transmit mode shall be set to the maximum apparent power level of the EUT.

A.2.4. Arrangement of test signal at the receiver RF input

The source providing the desired RF input signal to the receiver under test must be located outside the test environment.

For receivers with integral antennas, the desired RF input signal to establish a communication link must be delivered to the EUT from an antenna located within the measurement environment. This antenna must be connected to the external RF signal source by means that are not affected by signals within the test environment.

For receivers with separate antennas, the desired RF input signal to establish a communication link must be fed to the antenna connector of the EUT using a shielded conductor such as a coaxial cable. This cable must be connected to an external RF signal source.

The level of the desired RF input signal must be set to 40 dB greater than the receiver's minimum operable signal level. For radiated immunity testing this input signal level is measured while the power amplifiers generating EM noise are turned on, but without excitation.

NOTE: This desired RF input signal gain is intended to represent a normal operating signal level and is sufficient to avoid broadband interference from amplifiers that generate EM noise due to measurement effects.

A.2.5. Arrangement of test signal at the receiver output

The equipment that monitors the RF output signal from the receiver under test must be located outside the test environment.

For receivers with an output connector or port providing the desired output signal, this port must be used with the cable, compatible with standard cables used in normal operation and connected to the output (AE) monitoring equipment outside the test environment.

For receivers without output connectors, to give an audio or visual indication of the received signal, the output shall be coupled via a non-conductive medium to the monitoring equipment (AE) outside the test environment (for example, via a camera equipment to read the display).

A test fixture can be used to perform the measurement.

A.3. RF exclusion band of radio equipment

A.3.1. General

Exclusion bands shall be determined using the methods detailed in clauses A.3.2 and A.3.3 of this Regulation.

Whenever an exclusion band is applied, the specific band(s) to be excluded from evaluation shall be detailed in the technical documentation.

A.3.2. Exclusion band for the transmitter or transmitter portion of the transceiver

A.3.2.1. General

Do not apply exclusion bands when measuring transmitters in standby mode.

A.3.2.2. Channeling equipment

For multiplexing equipment, the exclusion band must extend 250% of the channel width on both sides of the transmitter's center frequency.

NOTE: The exclusion band is extended to 250% based on ITU-R Radio Regulations, 1.146, 1.146A and 1.146B

A.3.2.3. Unchannelized equipment

For unchannelized equipment, the exclusion band shall extend 250 % of the occupied bandwidth on either side of the transmitter's center frequency.

NOTE: The 250 % exclusion band is based on ITU-R Radio Regulations 1.146, 1.146A and 1.146B.

A.3.3. Exclusion band for the receiver or receiver in the transceiver

A.3.3.1. Applicability

Do not apply exclusion bands when testing the emissions of the receiver or the receiver portion of the transceiver.

A.3.3.2. Channelized equipment

For channelized equipment, the exclusion band is calculated using the following formulas:

For the lower limit of the exclusion band:

EXband(lower) = Band_Rx(lower) – nChW_Rx

For the upper limit of the exclusion band:

EXband(upper) = Band_Rx(upper) + nChW_Rx

Where n = number of channel widths required for the exclusion band.

NOTE: For equipment supporting multiple channel widths, the channel width used should be the largest channel width supported by the EUT.

In case this Regulation is used independently, the value of n must be 1.

A.3.3.3. Unchannelized equipment

For non-channelized equipment, the exclusion band is calculated using the following formulas:

For the lower limit of the exclusion band:

EXband(lower) = Band_Rx(lower) – UBW_RX

For the upper limit of the exclusion band:

EXband(upper) = Band_Rx(upper) + OBW_RX

Where n = multiple of the total bandwidth required to determine the exclusion band.

The receiver bandwidth is the bandwidth occupied by the corresponding transmitter signal.

In case this Regulation is used independently, the value of n must be 1.

Appendix B

(Regulations)

Auxiliary equipment

B.1. Auxiliary equipment

Auxiliary equipment is tested and evaluated in one of the following two ways:

- Separate the auxiliary equipment from the radio equipment outside the measurement area but still connect to the auxiliary equipment; or

- According to the combination of auxiliary equipment and radio equipment, both are located in the measurement area.

If you choose the first option, the exclusion band will not be applied to auxiliary equipment.

Appendix C

(Regulations)

Quality criteria

C.1. Introduction

Quality criteria are used to determine whether or not a radio equipment passes immunity tests.

There are two types of quality criteria applied in this Regulation:

• Quality criteria for continuous phenomena;
• Quality criteria for surges.

NOTE: Usually, quality criteria depend on the type of radio equipment. Therefore, this Regulation only includes general quality criteria commonly used to evaluate radio equipment. More relevant and specific quality criteria for a particular type of radio equipment can be found in the Specific conditions relating to each part of the EN 301 489 series of standards.

C.2. Quality criteria for continuous phenomena

While performing the test, the equipment must:

- Continue operations as planned;

- Not released without intention;

- Not change the operating status of the equipment unintentionally;

- Not change important stored data unintentionally.

C.3. Quality criteria for surges

For all ports, surge behavior with the exception described below, applies as follows:

- The application of surge must not lead to a change in operating mode (e.g. unintentional transmission) or loss of important stored data.

- After applying the surge, the equipment must operate as intended.

For overvoltage testing applied to symmetrically operated wireline network ports intended for direct connection to outdoor lines, the following criteria apply:

- For products with only one symmetrical port for connection to an outdoor line, lost functionality is permitted, provided that the functionality is self-recoverable, or can be restored by other means. Information stored in memory will not be lost, or is protected by battery backup.

- For products with more than one symmetrical port for connection to an outdoor line, loss of function on the port under test is permitted, provided that function can be restored automatically. Information stored in memory will not be lost, or is protected by battery backup.

Appendix D

(Regulations)

Relevant standard parts in the EN 301 489 series of standards

This regulation is Part 1 of the EMC multi-part standard for radio equipment and has the following structure:

• A set of EMC standards for all radio equipment made up of several standard parts.
• All general technical requirements on interference emissions and immunity have been placed in the general standards section, which is this Regulation.
• Separate standard sections contain separate requirements related to testing conditions, testing organization, evaluation of indicators, quality criteria, etc. for a particular radio equipment.
• The "Special conditions" section contained in all specific radio standards is used to appropriately add additional or different requirements of each radio equipment to the general requirements specified in this Regulation. .

To fully demonstrate the EMC requirements, this Regulation shall be used in conjunction with the separate conditions section for the particular radio equipment.

The EN 301 489 standard set includes:

Part 1: Common technical requirements;

Part 2: Specific conditions for radio paging equipment";

Part 3: Specific conditions for Short-Range Equipment operating in the frequency range between 9 Khz and 40 GHz;

Part 4: Specific conditions for fixed radio links; stations, auxiliary equipment and broadcast data transmission services;

Part 5: Specific conditions for private land mobile equipment (PRM) and auxiliary equipment (voice and non-voice);

Part 6: Specific conditions for Digital Enhanced Cordless Telecommunications (DECT) equipment

Part 9: Specific conditions for wireless microphone equipment, radio frequency analog audio connection equipment, audio equipment and wireless monitoring headsets;

Part 11: Specific conditions for terrestrial broadcasting transmitters;

Part 12: Specific conditions for VSAT, satellite ground stations operating in the frequency range from 4 GHz to 30 GHz in fixed satellite service (FSS);

Part 13: Specific conditions for amateur band (CB) radio and auxiliary equipment (voice and non-voice);

Part 14: Specific conditions for analog and digital terrestrial television transmitters.

Part 15: Specific conditions for commercially available amateur radio equipment;

Part 17: Specific conditions for broadband data transmission systems;

Part 19: Specific conditions for receive-only mobile land stations operating in the 1.5 GHz band to provide data information (ROMES);

Part 20: Specific conditions for mobile terrestrial stations (MES) used in mobile satellite services (MSS);

Part 22: Specific conditions for fixed and mobile aviation radio equipment in the VHF band;

Part 27: Specific conditions for ultra-low power implantable medical equipment (ULP-AMI) and related peripherals (ULP-AMI-P);

Part 28: Specific conditions for wireless digital video links;

Part 29: Specific conditions for digital medical equipment (MEDS) operating in the bands 401 MHz to 402 MHz and 405 MHz to 406 MHz;

Part 31: Specific conditions for ultra-low power implantable medical equipment (ULP-AMI) and related peripheral equipment (ULP-AMI-P) operating over the frequency range 9 kHz to 315 kHz;

Part 33: Specific conditions for ultra-wideband (UWB) communications equipment;

Part 34: Specific conditions for external power supplies (EPS) for mobile phones.

Part 35: "Particular requirements for low power active medical implants (LP-AMI) operating in the bands from 483.5 MHz to 2 500 MHz";

Part 50: "Specific conditions for base stations (BS), repeater stations and auxiliary equipment in mobile communications";

Part 51: "Specific conditions for automotive vehicles and surveillance radar equipment using 24.05 GHz to 24.25 GHz, 24.05 GHz to 24.5 GHz, 76 GHz to 77 GHz and 77 GHz to 81 GHz";

Part 52: "Specific conditions for mobile and portable equipment (UE) and auxiliary equipment in mobile communications".

Appendix E

(Reference)

Information provided to testing laboratories

The manufacturer must provide the following information for recording in the test report at the time of equipment submission:

- The main functions of the radio equipment to be evaluated during and after EMC exposure;

- The intended features of the radio equipment must be consistent with the technical documentation accompanying the equipment;

- User monitoring functions, stored data required for equipment operation, and methods used to evaluate whether these functions and stored data are lost after the equipment is exposed to EMC:

- Modulation type (normal test modulation), transmission characteristics used for testing (random bitstream, message format, etc.) and test equipment required for EUT evaluation;

- Auxiliary equipment combined with radio equipment for measurement and testing (if applicable);

- Full list of ports with maximum allowable cable length, classifying ports by power source or telecommunication/signal/surveillance. The power port must be further classified as an AC power port or a DC power port;

- The frequency ranges in which the equipment will operate;

- Any thermal limitations of the equipment that prevent continuous testing of the EUT;

- The operating environment of the equipment;

- The bandwidth occupied by the corresponding transmitter signal for non-channelized equipment.

If this regulation is used to demonstrate compliance with the European Directive 2014/53/EU for a particular type of equipment, radio where the Specific conditions section of EN 301 489 cannot be determined for this type of radio equipment, the manufacturer must provide the following information for recording in the measurement report at the time of equipment submission:

- Testing conditions, Appendix A;

- The value n is used to determine the exclusion bands in section A.3 of Annex A.

Appendix F

(Reference)

Application of harmonised EMC standards to multi-radio and
multi-standard-radio equipment

F.1. Introduction

This clause details the additional considerations when dealing with multi-radio and multi-standard-radio equipment

F.2. Multi-radio equipment capable of independent operation

If the individual radio equipment and their corresponding radio links operate independently in normal usage, then separate testing may be used. Where separate testing is performed the individual radio equipment should be assessed to the appropriate harmonized EMC standards.

F.3. Multi-radio equipment and multi-standard-radio equipment not capable of independent operation

However, where operation of the individual radio equipment and their corresponding radio links is simultaneous in normal usage, then separate testing should not be used. In this case testing should be performed on the complete radio equipment. An overall performance criterion is required for the radio equipment. This may be developed by examining the individual performance criteria of the various radio equipment involved. The performance criteria used should be recorded.

Where multiple operational frequencies are used, exclusion bands should be defined for each of the operating bands in use and all of these should be applied during testing.

F.4. Multi-radio equipment comprising of numerous identical radio transmitters

Typically, this situation exists where a baseband amplifier is used to feed, multiple radio preamplifiers, they can be placed at different locations to amplify the baseband signal. In this situation, individual parts can be tested separately against the appropriate harmonized EMC standard applicable to that product.

Appendix G

(Regulations)

HS code of radio communication equipment

References

EN 301 489-1 V2.2.3 (2019-11) Electro Magnetic Compatibility (EMC) Standard for radio equipment and services; Part 1: Common technical requirements; Harmonised Standard covering the essential requirements of article 3.1(b) of Directive 2014/53/EU and the essential requirements of article 6 of Directive 2014/30/EU.