GB/T 17626.3-2023 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 electromagnetic fields. The test method documented in this part of IEC 61000 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 byproduct committees of the IEC. As also stated in Guide 107, the IEC product committees are responsible for determining whether this immunity test standard shall be applied or not, and if applied, they are responsible for determining the appropriate test levels and performance criteria. SAC/TC 246 and its sub-committees are prepared to co-operate with product committees in the evaluation of the level of particular immunity tests and performance criteria for 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 document for evaluating the effect that electromagnetic radiation has on EUT. The simulation and measurement of electromagnetic radiation is not adequately exact for quantitative determination of effects. The test methods defined in this document have the primary objective of establishing an adequate reproducibility of testing repeatability of test results at EUTs.
This document is an independent test method. It is not possible to use other test methods as substitutes for claiming compliance with this document.
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.
IEC 60050-161 International Electrotechnical Vocabulary (IEV) - Part 161: Electromagnetic compatibility
Note: GB/T 4365-2003 Electrotechnical terminology - Electromagnetic compatibility [IEC 60050(161):1990, IDT]
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
IEC Electropedia: available at http: //www. electropedia.org/
ISO Online browsing platform: available at http: //www.iso.org/obp
3.1.1
amplitude modulation; AM
ability of equipment to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment
[Source: IEC 60050-702: 2016, 702-06-17]
3.1.2
anechoic chamber
shielded enclosure which is lined with radio-frequency absorbers to reduce reflections from the internal surfaces
3.1.3
fully anechoic chamber
shielded enclosure whose internal surfaces are totally lined with anechoic material
3.1.4
semi-anechoic chamber
shielded enclosure in which all surfaces except the metal floor are covered with material that absorbs electromagnetic energy (i.e. RF absorber) in the frequency range of interest
3.1.5
modified semi-anechoic chamber
semi-anechoic chamber which has additional absorbers installed on the ground plane
3.1.6
antenna
device that can effectively radiate or receive radio waves from space. It provides the required coupling between a transmitter or a receiver and the medium in which the radio wave propagates
Note 1: In practice, the terminals of the antenna or the points to be considered as the interface between the antenna and the transmitter or receiver shall be specified.
Note 2: If a transmitter or receiver is connected to its antenna by a feed line, the antenna may be considered to be a transducer between the guided waves of the feed line and the radiated waves in space.
[Source: GB/T 14733.10-2008, 712-01-01]
3.1.7
balun
device for transforming an unbalanced voltage to a balanced voltage or vice versa
[Source: GB/T 4365- 2003, 161-04-34]
3.1.8
common mode absorption device; CMAD
device that may be applied on cables leaving the test area in radiated immunity tests to damp resonances on cables
3.1.9
continuous wave; CW
sinusoidal electromagnetic wave, the successive oscillations of which are identical under steady-state conditions, which can be interrupted or modulated to convey information
3.1.10
electromagnetic wave
wave characterized by the propagation of a time-varying electromagnetic field
Note: An electromagnetic wave is produced by variations of electric charges or of electric currents
[Source: GB/T 14733.9-2008, 705-01-09]
3.1.11
far field
that region of the electromagnetic field of an antenna wherein the predominant components of the field are those which represent a propagation of energy and wherein the angular field distribution is essentially independent of the distance from the antenna
Note 1: In the far field region, all the components of the electromagnetic field decrease in inverse proportion to the distance from the antenna.
Note 2: For a broadside antenna having a maximum overall dimension D which is large compared to the wavelength λ, the far field region is commonly taken to exist at distances greater than 2D²/λ, from the antenna in the direction of maximum radiation.
[Source: GB/T 14733.10-2008, 712-02-02, modified -the word "region" has been removed from the term]
3.1.12
field strength
magnitude of the electromagnetic field at a given point
[Source: GB/T 14733.9-2008, 705-08-31, modified - the rest of the definition after "given point" has been deleted]
3.1.13
frequency band
continuous set of frequencies lying between two specified limiting frequencies
Note: A frequency band is characterized by two values which define its position in the frequency spectrum, for instance its lower and upper limiting frequencies.
[Source: GB/T 14733.7-2008, 702-01-02]
3.1.14
full illumination method
test method in which the EUT being tested fits completely within the uniform field area
Note: This test method may be applied for all test frequencies.
3.1.15
human body-mounted equipment
equipment which is intended for use when attached to or held in close proximity to the human body
Note: This term includes hand-held devices which are carried by people while in operation (e. g. pocket devices) as well as electronic aid devices and implants.
3.1.16
intentional RF emitting device
device which radiates (transmits) an electromagnetic field intentionally
Example: Digital mobile telephones and other radio devices
3.1.17
intermodulation
interaction in non-linear device or transmission medium between the spectral components of the input signal or signals producing new spectral components having frequencies equal to linear combination with integral coefficients of the frequencies of the input spectral components
Note: Intermodulation can result from a single non-sinusoidal input signal or from several sinusoidal or non-sinusoidal input signals applied to the same or to different inputs.
[Source: GB/T 4365-2003, 161-06-20]
3.1.18
isotropic field probe
field sensor, whose detection properties are independent of direction of propagation and polarization of an electromagnetic wave
[Source: GB/T 14733.12-2008, 731-03-08, modified-wording modified to apply to field probe]
3.1.19
maximum RMS value
highest short-term RMS value of a modulated RF signal during an observation time of one modulation period
Note: The short-term RMS is evaluated over a single carrier cycle. For example, in Figure 1 b), the maximum RMS voltage is:
3.1.20
modulation factor
in linear amplitude modulation, the ratio, generally expressed as a percentage, of the difference between the maximum and minimum amplitudes of the modulated signal to the sum of these amplitudes, expressed as:
See Table 2 and Figure 1.
[Source: GB/T 14733.7-2008, 702-06-19, modified - the note has been removed]
