GB/T 6113.104-2021Specification 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 (English PDF)

Foreword

This document was drafted as per the rules specified in GB/T 1.1-2020 Directives for

Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.

GB/T(Z) 6113 Specification for Radio Disturbance and Immunity Measuring Apparatus and

Methods is the basic standard for electromagnetic compatibility.

This Document is Part 1-4 of GB/T (Z) 6113.GB/T (Z) 6113 has published the following parts.

Part 1.Radio Disturbance and Immunity Measuring Apparatus

--- Part 1-1.Radio Disturbance and Immunity Measuring Apparatus - Measuring Apparatus;

--- Part 1-2.Radio Disturbance and Immunity Measuring Apparatus - Coupling Devices for

Conducted Disturbance Measurements;

--- Part 1-3.Radio Disturbance and Immunity Measuring Apparatus - Ancillary Equipment

- Disturbance Power;

--- Part 1-4.Radio Disturbance and Immunity Measuring Apparatus - Antennas and Test

Sites for Radiated Disturbance Measurements;

--- Part 1-5.Radio Disturbance and Immunity Measuring Apparatus - Antenna Calibration

Sites and Reference Test Sites for 5MHz ~ 18GHz;

--- Part 1-6.Radio Disturbance and Immunity Measuring Apparatus - EMC Antenna

Calibration.

Part 2.Methods of Measurement of Radio Disturbance and Immunity

--- Part 2-1.Methods of Measurement of Radio Disturbance and Immunity - Conducted

Disturbance Measurement;

--- Part 2-2.Methods of Measurement of Radio Disturbance and Immunity - Measurement

of Disturbance Power;

--- Part 2-3.Methods of Measurement of Radio Disturbance and Immunity - Radiated

Disturbance Measurements;

--- Part 2-4.Methods of Measurement of Radio Disturbance and Immunity - Immunity

Measurement;

--- Part 2-5.On-site Measurement of Disturbance Emission from Large Equipment.

Part 3.CISPR Technical Reports

--- Part 3.CISPR Technical Reports.

Part 4.Uncertainties, Statics and Limit Modelling

--- Part 4-1.Uncertainties, Statics and Limit Modelling - Uncertainty of Standardized EMC

Testing;

--- Part 4-2.Uncertainties, Statics and Limit Modelling - Measurement Instrumentation

Uncertainty;

--- Part 4-3.Uncertainties, Statics and Limit Modelling - Statistical Considerations for the

Determination of EMC Compliance of Bulk Products;

--- Part 4-4.Uncertainties, Statics and Limit Modelling - Complaint Statistics and

Calculation Model of Limits;

--- Part 4-5.Uncertainties, Statics and Limit Modelling - Conditions of Use for Alternative

Test Methods.

This Document replaced 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.

Compared with GB/T 6113.104-2016, the major technical changes of this Document are as

follows besides the structural adjustment and editorial modifications.

--- Add three terms such as "tested equipment space", etc.; and delete the term "free space

antenna coefficient" (see 3.1 of this Edition; 3.1 of 2016 Edition);

--- Change the measurement method of antenna symmetry (see 4.5.4 of this Edition; 4.5.4

of 2016 Edition);

--- Change the measurement method of cross-polarization (see 4.5.5 of this Edition; 4.5.5 of

2016 Edition);

--- Increase the lobe pattern requirements of the 1GHz~18GHz receiving antenna (see

1 Scope

This Document specifies the characteristics and performance of equipment for the measurement

of radiated disturbances in the frequency range 9 kHz ~ 18 GHz. Specifications for antennas

and test sites are included.

NOTE. In accordance with IEC Guide 107, CISPR 16-1-4 is a basic EMC publication for use by product

2 Normative References

The provisions in following documents become the essential provisions of this Document

through reference in this Document. For the dated documents, only the versions with the dates

indicated are applicable to this Document; for the undated documents, only the latest version

(including all the amendments) is applicable to this Document.

GB/T 6113.203-2020 Specification for Radio Disturbance and Immunity Measuring

Apparatus and Methods - Part 2-3.Methods of Measurement of Radio Disturbance and

Immunity - Radiated Disturbance Measurements (CISPR 16-2-3.2016, IDT)

3 Terms, Definitions and Abbreviated Terms

For the purposes of this Document, the terms, definitions and abbreviated terms given in CISPR

16-1-1, CISPR 16-1-5, IEC 60050-161 and the following apply.

4 Antennas for Measurement of Radiated Radio Disturbance

For measurement of the magnetic component of the radiation, either an electrically-screened

loop antenna of dimension such that the antenna can be completely enclosed by a square having

sides of 60 cm in length, or an appropriate ferrite-rod antenna, may be used.

In the frequency range 9 kHz ~ 30 MHz, the interference capability of the magnetic field

component of the radiation of a single EUT can be determined by using a large-loop antenna

system (LLAS).

5 Test Sites for Measurement of Radio Disturbance Field

Strength for the Frequency Range of 9 kHz ~ 30 MHz (Void)

6 Test Sites for Measurement of Radio Disturbance Field Strength for the Frequency Range of 30 MHz ~ 1 000 MHz

Weather protection is desirable if the test site is used throughout the year. A weather protection

structure can protect either the entire test site (including EUT and field-strength measuring

antenna) or the EUT only. The materials used shall be RF-transparent, to preclude undesirable

reflections and attenuation of the emitted field from the EUT (see 6.3.1).

To minimize these effects, the SA is measured at several antenna pair positions, and an average

value is calculated. This average value will converge to the SA of an ideal site.

7 Test Sites for Measurement of Radio Disturbance Field Strength for the Frequency Range 1 GHz ~ 18 GHz

Test sites used for measurements in the 1 GHz ~ 18 GHz range shall have a design that

minimizes the influence of reflections upon the received signal; for example, an anechoic

chamber.

Any test site that achieves free-space conditions is a possible alternative test site.

8 Common Mode Absorption Devices

The effects on CMAD measurement results from the adaptor sections and the adaptor ports can

be eliminated by using the TRL calibration method described in 8.4, providing a low uncertainty

for the final measurements. Any type of adaptor may be used for the measurements of 8.4.

Examples of adaptors are shown in Figures 29 to 31 (see 8.6).

Ferrite clamp-type CMADs are used during radiated disturbance measurements below 1 GHz

for the purpose of reducing compliance uncertainty.

9 Reverberating Chamber for Total Radiated Power Measurement

The walls and the stirrers shall be metallic. Joints between the metallic members shall be

mechanically sound and of low electrical resistance along the whole length, and there shall be

no surface corrosion. No absorbing material, such as wood, shall be placed inside the chamber.

The following describes two examples of stirrers. Other shapes are permitted, provided stirring

efficiency meets the criteria in 9.2.4.

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