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GB/T 9254.1-2021 English PDF (GBT9254.1-2021)

GB/T 9254.1-2021 English PDF (GBT9254.1-2021)

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GB/T 9254.1-2021: Information technology equipment, multimedia equipment and receivers -- Electromagnetic compatibility -- Part 1: Emission requirements
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;
- ...
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