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GB/T 9254.1-2021Information technology equipment, multimedia equipment and receivers - Electromagnetic compatibility - Part 1: Emission requirements (English PDF)

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 31, 2021

Implementation date

July 1, 2022

Scope

GB/T 9254.1-2021 (Information technology equipment, multimedia equipment and receivers - Electromagnetic compatibility - Part 1: Emission requirements) is available as an English-translated PDF.

GB/T 9254.1-2021 — This document applies to information technology equipment (3.1.19) whose rated AC voltage RMS or DC voltage does not exceed 600 V, audio equipment (3.1.6), video equipment (3.1.31), broadcast receiver equipment (3.1.7), entertainment lighting control equipment (3.1.14) and combinations thereof. This document also applies to the above-mentioned equipment for professional use. The emission requirements specified in this document do not apply to intentional emissions from radio transmitters as defined by the ITU. Nor does it apply to spurious emissions associated with these intentional emissions.

Document preview — GB/T 9254.1-2021

National Standard of the People's Republic of China

Issued by: SAMR; SAC

Foreword...4
Introduction...9
1 Scope...10
2 Normative references...10
3 Terms, definitions and abbreviations...11
3.1 Terms and definitions...11
3.2 Abbreviations...16
4 Classification of equipment...19
5 Requirements...19
6 Measurements...20
6.1 General...20
6.2 Host systems and modular EUT...20
6.3 Measurement procedure...22
7 Equipment documentation...22
8 Applicability...23
9 Test report...23
10 Compliance...25
11 Measurement uncertainty...25
Annex A (normative) Requirements...26
A.1 General...26
A.2 Requirements for radiated emissions...27
A.3 Requirements for conducted emissions...32

Foreword

This document was drafted in accordance with the rules given in GB/T 1.1-2020

"Directives for standardization - Part 1.Rules for the structure and drafting of

standardizing documents".

This document is Part 1 of GB/T 9254 "Information technology equipment, multimedia

equipment and receivers - Electromagnetic compatibility". The following parts of GB/T

9254 have been issued.

- Part 1.Emission requirements;

- Part 2.Immunity requirements.

This document replaces GB/T 9254-2008 "Information technology equipment - Radio

disturbance characteristics - Limits and methods of measurement" and GB/T 13837-

2012 "Sound and television broadcast receivers and associated equipment - Radio

disturbance characteristics - Limits and methods of measurement". This document

integrates the technical content of GB/T 9254-2008 and GB/T 13837-2012.Compared

with the above two documents, except for structural adjustment and editorial changes,

the main technical changes are as follows.

- The scope of application is wider. It is suitable for multimedia equipment, including

multimedia equipment for professional use and equipment applicable to GB/T

9254-2008 and GB/T 13837-2012;

- Change the warning words in the description of Class A equipment requirements

(see Chapter 7 of this document, 4.2 of GB/T 9254-2008);

- Change boundary definitions for EUT, AE and associated cables in radiated

emission measurements (see C.2.2.4 of this document, 10.3.1 of GB/T 9254-2008);

- Delete the chapter of "Explanation of CISPR harassment limits" (See Chapter 7 of

GB/T 9254-2008 and Chapter 6 of GB/T 13837-2012);

- Delete the requirements for disturbance power test items (see 4.5 and 5.6 of GB/T

13837-2012);

- Delete the requirements for the measurement limit of radiation power of the tuning

unit of the direct-to-home satellite receiver (see 4.7 of GB/T 13837-2012);

- Delete the requirements for the measurement limit of equivalent radiated power in

the radiated power of the outdoor unit of the direct-to-home satellite receiver (see

4.7 of GB/T 13837-2012);

- Delete the requirements for RMS-average detector measurement (see Chapter 4 of

GB/T 13837-2012);

- Add the limit requirements and measurement procedures for asymmetric mode

conducted emissions using a combination of current probes and CVP (see Table

clauses A11.2 and A12.2 and C.4.1.6.4 of this document);

- For the radiated emission measurement requirements below 1GHz, add the limit of

3m measurement distance in OATS/SAC and the limit of 3m measurement distance

and 10m measurement distance in FAR/FSOATS (see A.2 of this document);

- Add the limits and test methods for radiated emission testing in GTEM and RVC

(see Annex I of this document).

The revision of this document adopts CISPR 32.2015 "Electromagnetic compatibility

of multimedia equipment - Emission requirements".

This document is structurally consistent with CISPR 32.2015.The main technical

differences are as follows.

- According to the principle that CISPR product standards use CISPR basic standards

as references in principle, change "ANSI C63.5-2006" in normative references and

"ANSI C63.5" in C.2.2.2 to "GB/T 6113.106-2018";

- Delete the definition of 3.1.15 EUT. Add it as an abbreviation in 3.2;

- Since the content involves the host unit, add the definition of 3.1.18 "host unit";

- According to the broadcast signal system in China, delete the relevant abbreviations

AC-3, ATSC, BPSK, DMB-T, DQPSK, ISDB, ISDB-S, MPEG, OFDM applicable

to other countries and regions. Add abbreviations DTMB, DVB-S/S2;

- Since China has a relatively common rated voltage, delete the description that

"Measurement at two nominal voltages of 230 V (+/-10 V) and 110 V (+/-10 V), using

a frequency of 50 Hz or 60 Hz, is normally sufficient for an EUT intended for

worldwide use" in "The measurements shall be limited to." in Annex A of CISPR

32.2015;

- In Table A.2 ~ Table A.6, Table A.9 ~ Table A.10 and Table A.13, add relevant

instructions that "Tighter limits shall be applied at transition frequencies", so as to

make the limit requirements clearer;

- In Table A.2, Table A.4, Table A.6, Table A.10, Table A.11 and Table A.12, add

relevant instructions that "The limit decreases linearly with the logarithm of the

frequency", so as to make the limit requirements clearer;

- According to the scope of application of the document, MODIFY the relevant

contents that "AC mains ports that also have the function of a wired network port

shall meet the limits given in Table A.9" in Table A.11 of CISPR 32.2015 TO "The

AC power port with wired network port function (such as. power line

communication function) shall meet the limits given in Table A.9 when network

Information technology equipment, multimedia equipment

and receivers - Electromagnetic compatibility - Part 1.

Emission requirements

1 Scope

This document applies to information technology equipment (3.1.19) whose rated AC

voltage RMS or DC voltage does not exceed 600 V, audio equipment (3.1.6), video

equipment (3.1.31), broadcast receiver equipment (3.1.7), entertainment lighting

control equipment (3.1.14) and combinations thereof.

This document also applies to the above-mentioned equipment for professional use.

The emission requirements specified in this document do not apply to intentional

emissions from radio transmitters as defined by the ITU. Nor does it apply to spurious

emissions associated with these intentional emissions.

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 6113.104-2016, 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

(CISPR16-1-4.2012, IDT)

GB/T 6113.106-2018, Specification for radio disturbance and immunity measuring

apparatus and methods - Part 1-6.Radio disturbance and immunity measuring

apparatus - EMC antenna calibration (CISPR16-1-6.2014, IDT)

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 AC mains power port

port used to connect to the mains supply network

3.1.2 analogue/digital data port

signal/control port (3.1.30), antenna port (3.1.3), wired network port (3.1.32), broadcast

receiver tuner port (3.1.8), or optical fibre port (3.1.25) with metallic shielding and/or

metallic strain relief member(s)

4 Classification of equipment

This document defines Class A and Class B equipment according to two end-use

environments.

Class A equipment is equipment which meets the requirements given in Table A.2, Table

A.3, Table A.9, and Table A.11, using the limitations defined in Table A.1 and Table

A.8.

Class B equipment is equipment which meets the requirements given in Table A.4,

Table A.5, Table A.6, Table A.7, Table A.10, Table A.12 and Table A.13, using the

limitations defined in Table A.1 and Table A.8.

5 Requirements

The requirements for equipment covered within the scope of this document are defined

in Annex A.

6 Measurements

6.1 General

Chapter 6 specifies measurement facilities and instruments for EUT emission

measurements, including the relevant basic requirements given in the GB/T 6113

(CISPR 16) series of standards and other standards. It also specifies how to configure

and route the EUT, local AE and associated cables. The relevant measurement

procedures are provided.

The specification of the measurement facility, measurement equipment, procedures,

and the arrangement of the measurement equipment to be used are given in the basic

standards referred to in the tables in Annex A. Unless otherwise specified, the basic

standards shall be used for all aspects of the measurement.

6.2 Host systems and modular EUT

The following mainly describes how to configure the host system or modular EUT.

Modular systems can comprise different types of module(s), for example the EUT can

be.

- an external module, for example an infra-red remote control;

- an internal module, for example a computer hard disk;

- a plug-in module, for example a memory stick;

- a mounted module, for example a sound card or a video card.

7 Equipment documentation

The user documentation and/or manual shall contain details of any special measures

required to be taken by the purchaser or user to ensure EMC compliance of the EUT

with the requirements of this document. One example would be the need to use shielded

or special cables, such as category 5 F/UTP or category 6 U/UTP cabling as defined in

ISO/IEC 11801.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 6113.104-2016Specification 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 6113.106-2018

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