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GB/T 17626.3-2023 PDF in English


GB/T 17626.3-2023 (GB/T17626.3-2023, GBT 17626.3-2023, GBT17626.3-2023)
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GB/T 17626.3-2023: PDF in English (GBT 17626.3-2023)

GB/T 17626.3-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 33.100.20
CCS L 06
GB/T 17626.3-2023 / IEC 61000-4-3:2020
Replacing GB/T 17626.3-2016
Electromagnetic compatibility - Testing and measurement
techniques - Part 3: Radiated, radio-frequency,
electromagnetic field immunity test
[IEC 61000-4-3:2020, Electromagnetic compatibility (EMC) - Part 4-3: Testing and
measurement techniques - Radiated, radio-frequency, electromagnetic field immunity
test, IDT]
ISSUED ON: DECEMBER 28, 2023
IMPLEMENTED ON: JULY 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 5
Introduction ... 10
1 Scope ... 15
2 Normative references ... 16
3 Terms, definitions and abbreviated terms ... 16
3.1 Terms and definitions ... 16
3.2 Abbreviated terms ... 22
4 General ... 23
5 Test levels and frequency ranges ... 23
5.1 Selection of test level ... 23
5.2 Test frequency ranges ... 25
6 Test equipment ... 26
6.1 Test instrumentation ... 26
6.2 Description of the test facility ... 27
6.3 Uniform field area (UFA) ... 28
6.3.1 Characteristics of the UFA ... 28
6.3.2 Constant field strength level setting method ... 32
6.3.3 Constant power level setting method ... 34
7 Test setup ... 35
7.1 General ... 35
7.2 Arrangement of table-top equipment ... 36
7.3 Arrangement of floor-standing equipment ... 39
7.4 Arrangement of wiring ... 40
7.5 Arrangement of human body-mounted equipment ... 41
8 Test procedure ... 41
8.1 General ... 41
8.2 Laboratory reference conditions... 42
8.2.1 General... 42
8.2.2 Climatic conditions ... 42
8.2.3 Electromagnetic conditions ... 42
8.3 Execution of the test ... 42
8.4 Step sizes ... 44
9 Evaluation of test results ... 44
10 Test report ... 45
Annex A (informative) Rationale for the choice of modulation for tests related to the
protection against RF emissions from digital radio services ... 47
A.1 Summary of available modulation methods ... 47
A.2 Experimental results ... 48
A.3 Secondary modulation effects ... 51
A.4 Conclusion ... 51
Annex B (informative) Field generating antennas ... 52
B.1 Biconical antenna ... 52
B.2 Log-periodic antenna ... 52
B.3 Combination antennas ... 52
B.4 Horn antenna and double ridge wave guide antenna ... 52
Annex C (informative) Use of anechoic chambers ... 53
C.1 General anechoic chamber information ... 53
C.2 Use of ferrite-lined chambers at frequencies above 1 GHz ... 54
C.2.1 Problems caused by the use of ferrite-lined chambers for radiated field immunity tests
at frequencies above 1 GHz ... 54
C.2.2 Solutions to reduce reflections ... 54
Annex D (informative) Amplifier compression and non-linearity ... 56
D.1 Objective of limiting amplifier distortion ... 56
D.2 Possible problems caused by harmonics and saturation... 56
D.3 Limiting the harmonic content in the field ... 57
D.4 Effect of linearity characteristic on the immunity test ... 57
D.4.1 General ... 57
D.4.2 Evaluation method of the linearity characteristic ... 57
Annex E (informative) Guidance for product committees on the selection of test levels
... 61
E.1 General ... 61
E.2 Test levels related to general purposes ... 61
E.3 Test levels related to the protection against RF emissions from digital radio telephones
... 62
E.4 Special measures for fixed transmitters ... 64
Annex F (informative) Selection of test methods ... 65
Annex G (informative) Cable layout details ... 67
G.1 Intentions of EUT setup for radiated immunity test ... 67
G.2 Cable in the field ... 67
G.3 Cables leaving the test area ... 67
G.4 Turning the EUT cabinets ... 68
Annex H (informative) Examples of test setups for large and heavy EUTs ... 69
H.1 EUTs with bottom fed cables ... 69
H.2 EUTs with overhead cables ... 70
H.3 EUTs with multiple cables and AEs ... 71
H.4 Large EUTs with side fed cables and multiple UFA windows ... 72
Annex I (informative) Testing with multiple signals ... 74
I.1 General ... 74
I.2 Intermodulation ... 74
I.3 Power requirements ... 75
I.4 Level setting requirements ... 76
I.5 Linearity and harmonics checks ... 76
I.6 EUT performance criteria with multiple signals ... 77
Annex J (normative) Measurement uncertainty due to test instrumentation ... 78
J.1 General ... 78
J.2 Uncertainty budgets for level setting ... 78
J.2.1 Definition of the measurand ... 78
J.2.2 MU contributors of the measurand ... 78
J.2.3 Calculation examples for expanded uncertainty ... 79
J.2.4 Explanation of terms ... 80
J.3 Application ... 81
J.4 Reference documents ... 81
Annex K (informative) Calibration method for E-field probes ... 82
K.1 Overview ... 82
K.2 Probe calibration requirements ... 82
K.2.1 General ... 82
K.2.2 Calibration frequency range ... 83
K.2.3 Frequency steps ... 83
K.2.4 Field strength... 83
K.3 Requirements for calibration instrumentation ... 84
K.3.1 General ... 84
K.3.2 Harmonics and spurious signals ... 84
K.3.3 Linearity check for probe ... 85
K.3.4 Determination of the gain of the standard horn antennas ... 86
K.4 Field probe calibration in anechoic chambers ... 87
K.4.1 Calibration environments ... 87
K.4.2 Validation of anechoic chambers for field probe calibration ... 87
K.4.3 Probe calibration procedure ... 94
K.5 Other probe calibration environments and methods ... 97
K.5.1 General ... 97
K.5.2 Field probe calibration using TEM cells ... 97
K.5.3 Field probe calibration using waveguide chambers ... 98
K.5.4 Field probe calibration using open-ended waveguides ... 99
K.5.5 Calibration of field probes by gain transfer method ... 99
K.6 Reference documents ... 100
Bibliography ... 101
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 3 of GB/T(Z) 17626 "Electromagnetic compatibility - Testing
and measurement techniques". The following parts of GB/T(Z) 17626 have been issued:
- GB/T 17626.1-2006, Electromagnetic compatibility -- Testing and measurement
techniques -- Overview of immunity tests
- GB/T 17626.2-2018, Electromagnetic compatibility -- Testing and measurement
techniques -- Electrostatic discharge immunity test
- GB/T 17626.3-2023, Electromagnetic compatibility -- Testing and measurement
techniques -- Part 3: Radiated, radio-frequency, electromagnetic field immunity
test
- GB/T 17626.4-2018, Electromagnetic compatibility -- Testing and measurement
techniques -- Electrical fast transient/burst immunity test
- GB/T 17626.5-2019, Electromagnetic compatibility -- Testing and measurement
techniques -- Surge immunity test
- GB/T 17626.6-2017, Electromagnetic compatibility -- Testing and measurement
techniques -- Immunity to conducted disturbances, induced by radio-frequency
fields
- GB/T 17626.7-2017, Electromagnetic compatibility -- Testing and measurement
techniques -- General guide on harmonics and inter-harmonics measurements and
instrumentation, for power supply systems and equipment connected thereto
- GB/T 17626.8-2006, Electromagnetic compatibility (EMC) -- Part 4-8: Testing and
measurement techniques -- Power frequency magnetic field immunity test
- GB/T 17626.9-2011, Electromagnetic compatibility -- Testing and measurement
techniques -- Pulse magnetic field immunity test
- GB/T 17626.10-2017, Electromagnetic compatibility -- Testing and measurement
techniques -- Damped oscillatory magnetic field immunity test
- GB/T 17626.11-2023, Electromagnetic compatibility -- Testing and measurement
techniques -- Part 11: Voltage dips, short interruptions and voltage variations
immunity tests for equipment with input current up to 16 A per phase
- GB/T 17626.12-2023, Electromagnetic compatibility -- Testing and measurement
- GB/T 17626.29-2006, Electromagnetic compatibility (EMC) -- Testing and
measurement techniques -- Voltage dips short interruptions and voltage variations
on d.c. input power port immunity tests
- GB/T 17626.30-2023, Electromagnetic compatibility -- Testing and measurement
techniques -- Part 30: Power quality measurement methods
- GB/T 17626.31-2021, Electromagnetic compatibility -- Testing and measurement
techniques -- Part 31: AC mains ports broadband conducted disturbance
immunity test
- GB/Z 17626.33-2023, Electromagnetic compatibility -- Testing and measurement
techniques -- Part 33: Measurement methods for high-power transient parameters
- GB/T 17626.34-2012, Electromagnetic compatibility -- Testing and measurement
techniques -- Voltage dips, short interruptions and voltage variations immunity
tests for equipment with mains current more than 16 A per phase
- GB/T 17626.39-2023, Electromagnetic compatibility -- Testing and measurement
techniques -- Part 39: Radiated fields in close proximity immunity test
This document replaces GB/T 17626.3-2016 "Electromagnetic compatibility -- Testing
and measurement techniques -- Radiated, radio-frequency, electromagnetic field
immunity test". Compared with GB/T 17626.3-2016, in addition to the structural and
editorial changes, the main technical changes in this document are as follows:
- Add the content of immunity test of RF sources adjacent to EUT (see Chapter 1 of
this Edition);
- Delete the definitions of Ec, Et, independent window method, induction field, Pc
and scanning (see 3.10, 3.11, 3.14, 3.15, 3.20, 3.24 of Edition 2016);
- Add the definitions of common mode absorption device, intermodulation,
modulation factor, and reference ground plane (see 3.1.8, 3.1.17, 3.1.20, 3.1.24
of this Edition);
- Add abbreviated terms (see 3.2 of this Edition);
- Delete the test levels for digital wireless phones and other radio frequency
transmitting devices (see 5.2 of Edition 2016);
- Delete the 0.8m requirement for insulating tables and UFAs in the facility layout
(see Figure 2 of Edition 2016);
- Delete the requirement for the lower edge of 0.8 m in the picture in the UFA feature
(see Figure 3 of Edition 2016);
- Delete the description that the product is not too big, heavy and safe and can be
placed on a 0.8m high insulation table for testing (see 7.2 of Edition 2016);
- Add the requirement to use common mode absorbing devices to decouple cables
(see 7.4 of this Edition);
- Delete the upper limit requirement of the general test level frequency range (see
5.1 of Edition 2016);
- Change the content of field calibration, changing "field calibration" to "level
setting" (see 6.3 of this Edition; 6.2 of Edition 2016).
This document identically adopts IEC 61000-4-3:2020 "Electromagnetic compatibility
(EMC) - Part 4-3: Testing and measurement techniques - Radiated, radio-frequency,
electromagnetic field immunity test".
This document has made the following minimal editorial changes:
- To coordinate with existing standards, the name of the standard is changed to
"Electromagnetic compatibility - Testing and measurement techniques - Part 3:
Radiated, radio-frequency, electromagnetic field immunity test".
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 Electromagnetic Compatibility of Standardization
Administration of China (SAC/TC 246).
The drafting organizations of this document: Shanghai Electrical Apparatus Research
Institute, Ruifeng Radio Frequency Technology (Shanghai) Co., Ltd., Wuhu Saibao
Robot Industry Technology Research Institute Co., Ltd., Hubei Institute of Medical
Device Quality Supervision and Inspection, Shenzhen Zhiwei Intelligent Technology
Co., Ltd., Xihua University , Zhejiang Medical Device Inspection Institute, China
Merchants Jinling Shipbuilding (Nanjing) Co., Ltd., State Grid Sichuan Electric Power
Company Marketing Service Center, Hunan Electric Power Research Institute Testing
Group Co., Ltd., Shanghai Quality Supervision and Inspection Technology Research
Institute, China Electric Power Science Research Institute Co., Ltd., Jiangsu
Construction Vocational and Technical College, Shanghai Institute of Measurement and
Testing Technology, China Electronics Technology Standardization Institute, China
Academy of Information and Communications Technology, Lenovo (Beijing) Co., Ltd.,
Chengdu Xintong Software Co., Ltd., Guangdong Medical Equipment Quality
Supervision and Inspection Institute, Zhangzhou Shiruite Optoelectronics Technology
Co., Ltd., Shenzhen Hengyunchang Vacuum Technology Co., Ltd., Shenzhen Oumi
Intelligent Technology Co., Ltd., Qianyu Micro-Nano Technology (Shenzhen) Co., Ltd.,
Shenzhen Lifu Medical Technology Co., Ltd. Company, Shenzhen Zhongke
Supercomputer Technology Co., Ltd., Shenzhen Zhaoxin Microelectronics Co., Ltd.,
Electromagnetic compatibility - Testing and measurement
techniques - Part 3: Radiated, radio-frequency,
electromagnetic field immunity test
1 Scope
This document is applicable to the immunity requirements of electrical and electronic
equipment to radiated electromagnetic energy. It establishes test levels and the required
test procedures.
The object of this document is to establish a common reference for evaluating the
immunity of electrical and electronic equipment when subjected to radiated, radio-
frequency electromagnetic fields. The test method documented in this document
describes a consistent method to assess the immunity of an equipment or system against
RF electromagnetic fields from RF sources not in close proximity to the EUT. The test
environment is specified in Clause 6.
NOTE 1: As described in IEC Guide 107, this is a basic EMC publication for use by product
committees of the IEC. As also stated in Guide 107, the IEC product committees are responsible for
determining whether this immunity test standard should be applied or not, and if applied, they are
responsible for determining the appropriate test levels and performance criteria. National Technical
Committee on Electromagnetic Compatibility of Standardization Administration of China (SAC/TC
246) and its subcommittees work with product committees to evaluate test levels and performance
criteria for specific immunity tests on their products.
NOTE 2: Immunity testing against RF sources in close proximity to the EUT is defined in IEC
61000-4-39.
Particular considerations are devoted to the protection against radio-frequency
emissions from digital radiotelephones and other RF emitting devices.
NOTE 3: Test methods are defined in this part for evaluating the effect that electromagnetic radiation
has on the equipment concerned. The simulation and measurement of electromagnetic radiation is
not adequately exact for quantitative determination of effects. The test methods defined in this basic
document have the primary objective of establishing an adequate reproducibility of testing
configuration and repeatability of test results at various test facilities.
This document is an independent test method. It is not possible to use other test methods
as substitutes for claiming compliance with this document.
a) Position the sensor at one of the sixteen points in the grid (see Figure 4), and set
the frequency of the signal generator output to the lowest frequency in the range
of the test (for example 80 MHz).
NOTE 1: To lower the uncertainty of the field measurement, the probe is oriented in the same
manner at each of the grid points as it was oriented during the probe calibration.
b) Adjust the forward power to the field generating antenna so that the field strength
obtained (with field probe correction factors for frequency applied) is equal to the
level setting field strength EL. Record the forward power reading.
c) Increase the frequency using the step size given in Clause 8.
d) Repeat steps b) and c) until the next frequency in the sequence would exceed the
highest frequency in the range of the test. Finally, repeat step b) at the maximum
frequency of the test range (for example 1 GHz).
e) Repeat steps a) to d) for each point in the grid.
At each frequency:
1) Sort the sixteen forward power readings into ascending order.
2) Start at the highest value and check if at least the eleven readings below this value
(75% of grid points) are within the tolerance of -6 dB to 0 dB of that value.
3) If they are not within this tolerance of -6 dB to 0 dB, go back to the same procedure,
starting by the reading immediately below and so on (notice that in this example
of a sixteen-point UFA, there are only five possibilities for each frequency).
4) Stop the procedure if at least 12 power readings are within 6 dB. Take from these
numbers the position where the maximum forward power was obtained as the
reference. Record this value. Denote this forward power by PL.
5) Confirm that the test system (e.g. the power amplifier) is not in saturation.
Assuming that EL has been chosen as 1.8 times ET, perform the following
procedure at each level setting frequency:
i) decrease the output from the signal generator by 5.1 dB from the level needed
to establish a forward power of PL, as determined in the above steps (-5.1 dB
is the same as EL/1.8);
ii) record the new forward power delivered to the antenna;
iii) subtract the forward power measured in step ii) from PL. If the difference is
between 3.1 dB and 7.1 dB, then the amplifier is considered to be sufficiently
linear, and the test system is suitable for testing. If the difference is lower than
3.1db, then the test system is not linear and not suitable for testing.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.