GB/T 9254.1-2021 PDF in English
GB/T 9254.1-2021 (GB/T9254.1-2021, GBT 9254.1-2021, GBT9254.1-2021)
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Information technology equipment, multimedia equipment and receivers -- Electromagnetic compatibility -- Part 1: Emission requirements
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| GB 9254-2008 | English | 370 |
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[GB/T 9254-2008, 2013-XG1 included] Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement
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| GB 9254-1998 | English | 455 |
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Information technology equipment--Radio disturbance characteristics--Limits and methods of measurement
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| GB 9254-1988 | English | RFQ |
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Limits and methods of measurement of radio interference characterisics of information technology equipment
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Standards related to (historical): GB/T 9254.1-2021
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GB/T 9254.1-2021: PDF in English (GBT 9254.1-2021) GB/T 9254.1-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 33.100.10
CCS L 06
Replacing GB/T 9254-2008, GB/T 13837-2012
Information technology equipment, multimedia equipment
and receivers - Electromagnetic compatibility - Part 1:
Emission requirements
(CISPR 32:2015, Electromagnetic compatibility of multimedia equipment - Emission
requirements, MOD)
ISSUED ON: DECEMBER 31, 2021
IMPLEMENTED ON: JULY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
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
Annex B (normative) Exercising the EUT during measurement and test signal
specifications ... 37
B.1 General ... 37
B.2 Exercising of EUT ports ... 37
Annex C (normative) Measurement procedures, instrumentation and supporting
information... 42
C.1 General ... 42
C.2 Instrumentation and supporting information ... 42
C.3 General measurement procedures ... 45
C.4 Related measurement procedures ... 49
Annex D (normative) Arrangement of EUT, local AE and associated cabling ... 60
D.1 Overview ... 60
D.2 EUT-related conditions for conducted emission measurement ... 67
D.3 EUT-related requirements for radiated measurement ... 69
Annex E (informative) Pre-scan measurements ... 76
Annex F (informative) Test report contents summary ... 78
Annex G (informative) Support information for the measurement procedures defined in
C.4.1.1 ... 80
G.1 Schematic diagrams of examples of asymmetric artificial networks ... 80
G.2 Rationale for emission measurements and procedures for wired network ports ... 88
Annex H (normative) Supporting information for the measurement of outdoor unit of
home satellite receiving systems ... 96
H.1 Rationale ... 96
H.2 General ... 97
H.3 Operation conditions ... 97
H.4 Specific requirements for LO measurement ... 98
H.5 EUT arrangements ... 98
Annex I (informative) Other test methods and associated limits for radiated emissions
... 100
I.1 General ... 100
I.2 Procedures for radiated emission measurements using a GTEM or RVC ... 100
I.3 Additional measurement procedure information ... 103
I.4 Use of a GTEM for radiated emission measurements ... 103
I.5 Specific EUT arrangement requirements for radiated emission measurements above 1
GHz using an RVC ... 106
I.6 Reference documents ... 107
Bibliography... 108
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
communication is not established. When the network communication is established,
the implementation of the launch requirements is suspended, or the laws and
regulations of the relevant national departments, or other national standards or
industry standards may be referred to.”;
- According to the scope of application of the document, MODIFY the relevant
contents in A.12 that “AC mains ports that also have the function of a wired
network port shall meet the limits given in Table A.10” TO “The AC power port
with wired network port function (such as: power line communication function)
shall meet the limits given in Table A.10 when network communication is not
established. When establishing network communication, its launch requirements
are suspended, or the laws and regulations of relevant national departments, or
other national standards or industry standards may be referred to.”;
- According to the requirements of Chinese broadcasting system, make
corresponding adjustments to the provisions of Annex B for operating and test
signals during measurement. The main adjustments involve Table B.3 and Table
B.4;
- Since the vertical color bar information is not specified in the ITU-R BT1729
standard, modify the description in Table B.1 that “A TV vertical color bar signal
that meets the ITU-R BT1729 standard, with a motion unit. See NOTE 1.” TO “A
standard TV color bar signal with an additional small motion unit that meets the
corresponding digital TV signal format. See NOTE 1.”; [Translator NOTE: In the
actual text, it is “NOTE a.”]
- Since Table C.1 is selected for the emission measurement procedure for the
analog/digital data port, it also corresponds to the requirements of Table A.11 and
Table A.12, comprehensively considering the consistency of technical content,
delete the relevant description about "AC Mains" in Table C.1;
- In Table I.2~Table I.7, add relevant remarks that "Tighter limits shall be applied at
transition frequencies", so as to make the limit requirements clearer.
The following editorial changes have been made to this document:
- Considering the scope of application of the document comprehensively, modify the
document name to “Information technology equipment, multimedia equipment and
receivers - Electromagnetic compatibility - Part 1: Emission requirements:
- Correct the description of the 4th paragraph in A.1 that "Other measurement
methods and associated limits for RVCs and GTEM cells are presented in Annex
H for information." TO "Other measurement methods and associated limits for
RVCs and GTEM cells are presented in Annex I for information";
- Correct the verification corresponding to Clause A1.1 of Table A.1 to "5.4 of GB/T
6113.104-2016". Description of the method "5.3 of CISPR 16-1-
4:2010/AMD1:2012" as well as A1.2 description of the corresponding verification
method "5.2 of CISPR 16-1-4:2010/AMD1:2012" are all corrected to "5.4 of GB/T
6113.104-2016";
- Correct the corresponding restrictions and instructions in Clause A1.4 in Table A.1
that “Where the same room is to be used for radiated emission testing above 1 GHz,
apply table clause A.3.” TO "Where the same room is to be used for radiated
emission testing above 1 GHz, apply table clause A1.3.".
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by and shall be under the jurisdiction of National
Technical Committee on Radio Interference of Standardization Administration of China
(SAC/TC 79).
The drafting organizations of this document: China Electronics Standardization
Institute, Third Research Institute of China Electronics Technology Group Corporation,
Lenovo (Beijing) Co., Ltd., Huawei Technologies Co., Ltd., Shanghai Institute of
Quality Supervision and Inspection Technology, Fifth Electronics Research Institute of
Ministry of Industry and Information Technology, China Quality Certification Center,
China Academy of Information and Communications Technology, National Radio
Monitoring Center Testing Center, Radio and Television Planning Institute of the State
Administration of Radio and Television, Beijing Jiaotong University, Nanjing Rongtest
Testing Technology Co., Ltd., Weikai Testing Technology Co., Ltd., Beijing Futest
Electronic Instruments Co., Ltd., China National Accreditation Center for Conformity
Assessment, China Inspection Group Southern Testing Co., Ltd., Beijing Zunguan
Technology Co., Ltd., Jiangsu Electronic Information Product Quality Supervision and
Inspection Institute, Xinhua Three Technology Co., Ltd., Southeast University, China
Certification Shangdong (Shanghai) Testing Technology Co., Ltd.
Main drafters of this document: Li Huanran, Zhang Qiang, Xu Wei, Lin Jingping, Lv
Feiyan, Zhang Xinghai, Chen Yegang, Chen Hui, Zhu Lin, Zhou Yi, Tao Hongbo, Cai
Xiaomei, Zhu Yun, Cui Qiang, Zhang Xia, Zeng Bo, Lan Defu, Liu Jia, Li Sixiong, Xu
Chunfeng, Wang Minliang, Yin Hanfang, Zhou Xiang, Huang Xiaopei, Long Sheng.
The previous versions of this document and its superseded documents are as follows:
- It is GB 9254-1988 that was issued in 1988 for the first time. The first revision was
in 1998. The second revision was in 2008. This is the third revision;
- It is GB 6114-1985 that was issued in 1985 for the first time. It was GB 7236-1986
that was issued in 1986 for the first time. During the first revision in 1992, it
combined GB 6114-1985 and GB 7236-1986 to form GB 13837-1992. The second
revision was in 1997. The third revision was in 2003. The fourth revision was in
2012;
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.
Equipment that specifies emission requirements for the applicable frequency bands of
this document in other national standards corresponding to IEC/CISPR (except GB/T
9254 and GB/T 13837) are not included in the scope of this document.
This document does not apply to on-site tests.
This document contains Class A and Class B equipment. The classification of
equipment is specified in Chapter 4.
The objectives of this document are:
a) to establish requirements which provide an adequate level of protection of the
radio spectrum, allowing radio services to operate as intended in the frequency
range 9 kHz to 400 GHz;
b) to specify procedures to ensure the reproducibility of measurement and the
repeatability of results.
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.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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