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GB 4824-2019: Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
GB 4824-2019
Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
ICS 33.100
L06
National Standards of People's Republic of China
Replace GB 4824-2013
Radio frequency disturbance characteristics of industrial, scientific and medical equipment
Limits and measurement methods
2019-12-17 released
2020-07-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Preface Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Frequency of use of engineering medical equipment 4
5 Grouping and classification of equipment 5
6 Limits of electromagnetic disturbance 5
7 Measurement requirements 17
8 Special regulations for test site measurement (9kHz~1GHz) 27
9 Radiation measurement (1GHz~18GHz) 34
10 Field measurement 37
11 Radiation measurement safety protection of ISM radio frequency equipment 37
12 Measurement uncertainty 37
Appendix A (informative appendix) Examples of equipment grouping 38
Appendix B (informative appendix) Precautions for using spectrum analyzer (see 7.3.1) 40
Appendix C (Normative Appendix) Measurement of electromagnetic radiation disturbance when radio transmission signals are present 41
Appendix D (informative appendix) Interference propagation of industrial radio frequency equipment in the 30MHz~300MHz frequency band 42
Appendix E (informative appendix) CISPR recommendations for the protection of specific radio services in specific areas 43
Appendix F (informative appendix) Band allocation for safety-related radio services 44
Appendix G (informative appendix) sensitive radio service frequency band allocation 46
Appendix H (informative appendix) Statistical evaluation methods for batch products complying with CISPR standards 49
Appendix I (Normative Appendix) Artificial network (AN) used to evaluate the disturbance voltage of the DC power port of the semiconductor power converter 53
Appendix J (informative appendix) Measurement of grid-connected power converter (GCPC) --- Arrangement of effective measurement site configuration 59
Appendix K (informative appendix) The configuration and equipment of the test site --- When the type test is carried out in accordance with this standard, prevent no transformer
Guidelines for filter saturation effects caused by power converters 64
References 69
Preface
All technical content of this standard is mandatory.
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 4824-2013 "Industrial, Scientific and Medical (ISM) Radio Frequency Equipment Disturbance Characteristics Limits and Measurement Methods", this
Compared with GB 4824-2013, the main technical changes are as follows.
---The name of the standard was changed to "Industrial, scientific and medical equipment radio frequency disturbance characteristic limits and measurement methods";
---Further clarified the scope of application of the standards in Chapter 1 (see Chapter 1);
---Modified "Chapter 2 Normative Reference Documents" (see Chapter 2);
--- "Chapter 3 Terms and Definitions" added AC power port, artificial power network, components, DC artificial network, DC power terminal
Port, grid-connected power converter, high-power power electronic system and equipment, photovoltaic power generation system, type test, full electric wave anechoic chamber, open
12 terms and definitions of test site and semi-anechoic chamber (see Chapter 3);
--- Added "5.3 User File" (see 5.3);
--- "6.2 1 set of equipment measured at the test site" has added the limit for equipment with a power greater than 75kVA, and the DC power port
Disturbance voltage limit (see 6.2);
---The main changes in "6.3 Two groups of equipment measured on the test site" are summarized as.
● When measuring at the test site, the 3m distance limit in the electromagnetic radiation disturbance limit of Group 2 A equipment was revised
(See Table 10 of the.2013 edition);
● "The peak limit of electromagnetic radiation harassment for the 2 groups of equipment that has a working frequency above 400MHz and produces continuous harassment" has been increased
11.7GHz~12.7GHz limit (see Table 13 of the.2013 edition);
● Deleted "Table 15 The electrical equipment of Group B equipment that has a working frequency above 400MHz and produces fluctuating disturbances other than continuous waves.
Magnetic radiation disturbance peak limit” (see Table 15 in the.2013 edition);
● Added "Table 15 with working frequency above 400MHz, 2 groups of Class B electromagnetic radiation disturbance limits (APD level corresponds to
10-1)” (see Table 15 of the.2013 edition);
---Added "Figure 3 Typical cable arrangement for 3m distance radiated disturbance measurement ---Desktop tested equipment" (see Figure 3);
--- Added "Figure 4 Typical measurement arrangement for conduction and/or radiated disturbance measurement of floor-standing equipment under test---three-dimensional diagram" (see Figure 4);
---Added "7.5.3.1.3 30MHz~18GHz radiated disturbance measurement connected to the laboratory AC grid" (see 7.5.3.1.3);
---"7.6 Load conditions of the equipment under test" added "ISM radio frequency lighting equipment, medium voltage (MV) and high voltage (HV) switchgear,
Grid-connected power converter" requirements (see 7.6);
---Added "8.2.2 Grid-connected power converter measurement" (see 8.2.2);
---Added "9.4.2 Working conditions of the equipment under test (EUT)" (see 9.4.2);
---Added "9.4.3 Forecast" (see 9.4.3);
---Added "9.4.4 Final measurement" (see 9.4.4);
--- "12 Equipment Conformity Assessment" was revised to "12 Measurement Uncertainty" (see Chapter 12 of the.2013 edition);
--- Deleted "13 diagrams and flowcharts" (see Chapter 13 of the.2013 edition);
---Added "Appendix H (informative appendix) Statistical evaluation methods for batch products in compliance with CISPR standards" (see appendix
H);
---Added "Appendix I (Normative Appendices) to the artificial network used to evaluate the disturbance voltage of the DC power port of the semiconductor power converter
Network (AN)” (see Appendix I);
---Added "Appendix J (informative appendix) Measurement of grid-connected power converter (GCPC) --- Effective measurement site configuration
Set” (see Appendix J);
---Added "Appendix K (informative appendix) test site configuration and equipment---type test in accordance with this standard
“Guidelines for preventing the saturation effect of the suppression filter of transformerless power converters” (see Appendix K).
The translation method used in this standard is equivalent to the adoption of CISPR11.2016 "Industrial, scientific and medical equipment radio frequency disturbance characteristic limits and measurement
Measure Method” (E6.1).
The Chinese documents that have consistent correspondence with the normatively cited international documents in this standard are as follows.
---GB/T 6113.101-2016 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-1.Radio
Disturbance and immunity measurement equipment measurement equipment (CISPR16-1-1.2010, IDT);
---GB/T 6113.203-2016 Radio disturbance and immunity measurement equipment and measurement method specification Part 2-3.Radio
Disturbance and immunity measurement method Radiated disturbance measurement (CISPR16-2-3.2010, IDT);
---GB 9706.4-2009 Medical electrical equipment Part 2-2.Special requirements for the safety of high-frequency surgical equipment (IEC 60601-2-2.
2006, IDT);
---GB/T 10066.6-2018 Test methods for electric heating and electromagnetic treatment devices Part 6.Industrial microwave heating device output
Power measurement method (IEC 61307.2011, MOD);
---GB/T 15579.10-2008 Arc Welding Equipment Part 10.Electromagnetic Compatibility (EMC) Requirements (IEC 60974-10.
2007, IDT);
---YY0505-2005 Medical electrical equipment Part 1-2.General requirements for basic safety and basic performance
Magnetic disturbance requirements and tests (IEC 60601-1-2.2001, IDT).
This standard has made the following editorial changes.
---Refer to the "Regulations on Radio Frequency Allocation of the People's Republic of China (Order No. 46 of the Ministry of Industry and Information Technology)" for informational attachments
Record G. The corresponding frequency band in the allocation of sensitive radio service frequency bands will be modified to make it more suitable for use in my country.
This standard was proposed and managed by the National Standardization Management Committee.
Drafting organizations of this standard. Shanghai Electric Power Research Institute, State Grid Electric Power Research Institute Co., Ltd., China Electric Power Research Institute Co., Ltd.
Company, Beijing Medical Device Inspection Institute, Jiangsu Medical Device Inspection Institute, South China Laboratory of China Quality Certification Center, Hitachi Building Technology
(Guangzhou) Co., Ltd., Tianjin Radio Monitoring Station, Shanghai Matsushita Microwave Oven Co., Ltd., Shanghai New Times Electric Co., Ltd., Coal
Science and Technology Research Institute Co., Ltd., China Household Electrical Appliances Research Institute, Beijing Jiaotong University, the Fifth Institute of Electronics, Ministry of Industry and Information Technology, Shanghai
Electric Distributed Energy Technology Co., Ltd.
The main drafters of this standard. Xie Yanping, Ye Qiongyu, Xiao Baoming, Zhao Mingmin, Meng Zhiping, Miao Jia, Xu Ling, Liu Haichao, Huang Wenguang, Liu Jingli,
Lu Jun, Xu Dongyu, Zhang Mei, Lin Shanshan, Xin Zhonghua, Li Yan, Wen Yinghong, Chen Hui, Liu Zhijie, Zhu Fengtian, Wang Longfei.
The previous versions of the standard replaced by this standard are as follows.
---GB 4824-1984, GB 4824-1996, GB 4824-2001, GB 4824-2004, GB 4824-2013.
Radio frequency disturbance characteristics of industrial, scientific and medical equipment
Limits and measurement methods
1 Scope
This standard applies to industrial, scientific and medical electrical (hereinafter referred to as engineering medicine) equipment with a working frequency in the range of 0Hz to 400GHz
And household and similar appliances designed to generate and/or locally use radio frequency energy.
This standard covers the emission requirements of radio frequency disturbances in the 9kHz~400GHz frequency band. However, it is only necessary to enter the frequency range specified in Chapter 6
Line measurement.
For the engineering and medical radio frequency applications defined in the International Telecommunication Union (ITU) (see definition 3.13), this standard covers 9kHz~18GHz
Radio frequency disturbance emission requirements in the frequency band.
Note. The emission requirements of induction cookers are in accordance with the requirements of GB 4343.1-2018.
This standard is also applicable to the technical medical radio frequency lighting equipment and purple radio frequency lighting equipment in the technical medical frequency band defined by the International Telecommunication Union (ITU)
Outside radiation equipment.
This standard does not apply to equipment that has been covered in other CISPR product categories or other product emission standards.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 4365-2003 Electrotechnical terminology electromagnetic compatibility (IEC 60050-161.1990, IDT)
GB/T 6113.102-2018 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-2.Radio disturbance
Coupling device for conducting disturbance measurement with immunity measuring equipment (CISPR16-1-2.2014, IDT)
GB/T 6113.104-2016 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-4.Radio disturbance
Antenna and test site for radiated disturbance measurement with immunity measurement equipment (CISPR16-1-4.2012, IDT)
GB/T 6113.201-2018 Radio disturbance and immunity measurement equipment and measurement method specification Part 2-1.Radio disturbance
And Immunity Measurement Method Conducted Disturbance Measurement (CISPR16-2-1.2014, IDT)
GB/T 6113.402-2018 Radio disturbance and immunity measurement equipment and measurement method specification Part 4-2.Uncertainty,
Statistics and Limit Modeling Uncertainty of Measuring Equipment and Facilities (CISPR16-4-2.2014, IDT)
GB/T 31251.2-2014 Resistance welding equipment Part 2.Electromagnetic compatibility requirements (IEC 62135-2.2007, IDT)
3 Terms and definitions
The following terms and definitions defined in GB/T 4365-2003 apply to this document.
3.1
AC power port
A port used to connect a public low-voltage AC power distribution network or other low-voltage AC power devices.
3.2
Arc welding equipment
The equipment that applies current and voltage has the characteristics required for arc welding and similar processes.
3.3
Artificial power network
Provide a specified impedance network between the terminals of the equipment under test in the radio frequency range, which can connect the test circuit and the useless power supply
The radio frequency signal is isolated and the disturbance voltage is coupled to the measuring receiver.
Note 1.There are two basic types of artificial power networks, namely V-type for coupling asymmetric voltage and Δ for coupling symmetric voltage and asymmetric voltage.
The internet.
Note 2.The terms line impedance stabilization network (LISN) and V-type artificial power network can be used interchangeably.
3.4
Boundary of the device under test
An imaginary straight line boundary containing the simple geometry of the device under test.
Note. All interconnecting cables are included in this limit.
3.5
Components
It is expected to be used to assemble higher-level equipment or systems and provide one or more products with specific functions.
4 Frequency of use of engineering medical equipment
According to the International Telecommunication Union (ITU) assigned frequency table, my country assigns radio frequency applic...
Get Quotation: Click GB 4824-2019 (Self-service in 1-minute)
Historical versions (Master-website): GB 4824-2019
Preview True-PDF (Reload/Scroll-down if blank)
GB 4824-2019: Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
GB 4824-2019
Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
ICS 33.100
L06
National Standards of People's Republic of China
Replace GB 4824-2013
Radio frequency disturbance characteristics of industrial, scientific and medical equipment
Limits and measurement methods
2019-12-17 released
2020-07-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Preface Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Frequency of use of engineering medical equipment 4
5 Grouping and classification of equipment 5
6 Limits of electromagnetic disturbance 5
7 Measurement requirements 17
8 Special regulations for test site measurement (9kHz~1GHz) 27
9 Radiation measurement (1GHz~18GHz) 34
10 Field measurement 37
11 Radiation measurement safety protection of ISM radio frequency equipment 37
12 Measurement uncertainty 37
Appendix A (informative appendix) Examples of equipment grouping 38
Appendix B (informative appendix) Precautions for using spectrum analyzer (see 7.3.1) 40
Appendix C (Normative Appendix) Measurement of electromagnetic radiation disturbance when radio transmission signals are present 41
Appendix D (informative appendix) Interference propagation of industrial radio frequency equipment in the 30MHz~300MHz frequency band 42
Appendix E (informative appendix) CISPR recommendations for the protection of specific radio services in specific areas 43
Appendix F (informative appendix) Band allocation for safety-related radio services 44
Appendix G (informative appendix) sensitive radio service frequency band allocation 46
Appendix H (informative appendix) Statistical evaluation methods for batch products complying with CISPR standards 49
Appendix I (Normative Appendix) Artificial network (AN) used to evaluate the disturbance voltage of the DC power port of the semiconductor power converter 53
Appendix J (informative appendix) Measurement of grid-connected power converter (GCPC) --- Arrangement of effective measurement site configuration 59
Appendix K (informative appendix) The configuration and equipment of the test site --- When the type test is carried out in accordance with this standard, prevent no transformer
Guidelines for filter saturation effects caused by power converters 64
References 69
Preface
All technical content of this standard is mandatory.
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 4824-2013 "Industrial, Scientific and Medical (ISM) Radio Frequency Equipment Disturbance Characteristics Limits and Measurement Methods", this
Compared with GB 4824-2013, the main technical changes are as follows.
---The name of the standard was changed to "Industrial, scientific and medical equipment radio frequency disturbance characteristic limits and measurement methods";
---Further clarified the scope of application of the standards in Chapter 1 (see Chapter 1);
---Modified "Chapter 2 Normative Reference Documents" (see Chapter 2);
--- "Chapter 3 Terms and Definitions" added AC power port, artificial power network, components, DC artificial network, DC power terminal
Port, grid-connected power converter, high-power power electronic system and equipment, photovoltaic power generation system, type test, full electric wave anechoic chamber, open
12 terms and definitions of test site and semi-anechoic chamber (see Chapter 3);
--- Added "5.3 User File" (see 5.3);
--- "6.2 1 set of equipment measured at the test site" has added the limit for equipment with a power greater than 75kVA, and the DC power port
Disturbance voltage limit (see 6.2);
---The main changes in "6.3 Two groups of equipment measured on the test site" are summarized as.
● When measuring at the test site, the 3m distance limit in the electromagnetic radiation disturbance limit of Group 2 A equipment was revised
(See Table 10 of the.2013 edition);
● "The peak limit of electromagnetic radiation harassment for the 2 groups of equipment that has a working frequency above 400MHz and produces continuous harassment" has been increased
11.7GHz~12.7GHz limit (see Table 13 of the.2013 edition);
● Deleted "Table 15 The electrical equipment of Group B equipment that has a working frequency above 400MHz and produces fluctuating disturbances other than continuous waves.
Magnetic radiation disturbance peak limit” (see Table 15 in the.2013 edition);
● Added "Table 15 with working frequency above 400MHz, 2 groups of Class B electromagnetic radiation disturbance limits (APD level corresponds to
10-1)” (see Table 15 of the.2013 edition);
---Added "Figure 3 Typical cable arrangement for 3m distance radiated disturbance measurement ---Desktop tested equipment" (see Figure 3);
--- Added "Figure 4 Typical measurement arrangement for conduction and/or radiated disturbance measurement of floor-standing equipment under test---three-dimensional diagram" (see Figure 4);
---Added "7.5.3.1.3 30MHz~18GHz radiated disturbance measurement connected to the laboratory AC grid" (see 7.5.3.1.3);
---"7.6 Load conditions of the equipment under test" added "ISM radio frequency lighting equipment, medium voltage (MV) and high voltage (HV) switchgear,
Grid-connected power converter" requirements (see 7.6);
---Added "8.2.2 Grid-connected power converter measurement" (see 8.2.2);
---Added "9.4.2 Working conditions of the equipment under test (EUT)" (see 9.4.2);
---Added "9.4.3 Forecast" (see 9.4.3);
---Added "9.4.4 Final measurement" (see 9.4.4);
--- "12 Equipment Conformity Assessment" was revised to "12 Measurement Uncertainty" (see Chapter 12 of the.2013 edition);
--- Deleted "13 diagrams and flowcharts" (see Chapter 13 of the.2013 edition);
---Added "Appendix H (informative appendix) Statistical evaluation methods for batch products in compliance with CISPR standards" (see appendix
H);
---Added "Appendix I (Normative Appendices) to the artificial network used to evaluate the disturbance voltage of the DC power port of the semiconductor power converter
Network (AN)” (see Appendix I);
---Added "Appendix J (informative appendix) Measurement of grid-connected power converter (GCPC) --- Effective measurement site configuration
Set” (see Appendix J);
---Added "Appendix K (informative appendix) test site configuration and equipment---type test in accordance with this standard
“Guidelines for preventing the saturation effect of the suppression filter of transformerless power converters” (see Appendix K).
The translation method used in this standard is equivalent to the adoption of CISPR11.2016 "Industrial, scientific and medical equipment radio frequency disturbance characteristic limits and measurement
Measure Method” (E6.1).
The Chinese documents that have consistent correspondence with the normatively cited international documents in this standard are as follows.
---GB/T 6113.101-2016 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-1.Radio
Disturbance and immunity measurement equipment measurement equipment (CISPR16-1-1.2010, IDT);
---GB/T 6113.203-2016 Radio disturbance and immunity measurement equipment and measurement method specification Part 2-3.Radio
Disturbance and immunity measurement method Radiated disturbance measurement (CISPR16-2-3.2010, IDT);
---GB 9706.4-2009 Medical electrical equipment Part 2-2.Special requirements for the safety of high-frequency surgical equipment (IEC 60601-2-2.
2006, IDT);
---GB/T 10066.6-2018 Test methods for electric heating and electromagnetic treatment devices Part 6.Industrial microwave heating device output
Power measurement method (IEC 61307.2011, MOD);
---GB/T 15579.10-2008 Arc Welding Equipment Part 10.Electromagnetic Compatibility (EMC) Requirements (IEC 60974-10.
2007, IDT);
---YY0505-2005 Medical electrical equipment Part 1-2.General requirements for basic safety and basic performance
Magnetic disturbance requirements and tests (IEC 60601-1-2.2001, IDT).
This standard has made the following editorial changes.
---Refer to the "Regulations on Radio Frequency Allocation of the People's Republic of China (Order No. 46 of the Ministry of Industry and Information Technology)" for informational attachments
Record G. The corresponding frequency band in the allocation of sensitive radio service frequency bands will be modified to make it more suitable for use in my country.
This standard was proposed and managed by the National Standardization Management Committee.
Drafting organizations of this standard. Shanghai Electric Power Research Institute, State Grid Electric Power Research Institute Co., Ltd., China Electric Power Research Institute Co., Ltd.
Company, Beijing Medical Device Inspection Institute, Jiangsu Medical Device Inspection Institute, South China Laboratory of China Quality Certification Center, Hitachi Building Technology
(Guangzhou) Co., Ltd., Tianjin Radio Monitoring Station, Shanghai Matsushita Microwave Oven Co., Ltd., Shanghai New Times Electric Co., Ltd., Coal
Science and Technology Research Institute Co., Ltd., China Household Electrical Appliances Research Institute, Beijing Jiaotong University, the Fifth Institute of Electronics, Ministry of Industry and Information Technology, Shanghai
Electric Distributed Energy Technology Co., Ltd.
The main drafters of this standard. Xie Yanping, Ye Qiongyu, Xiao Baoming, Zhao Mingmin, Meng Zhiping, Miao Jia, Xu Ling, Liu Haichao, Huang Wenguang, Liu Jingli,
Lu Jun, Xu Dongyu, Zhang Mei, Lin Shanshan, Xin Zhonghua, Li Yan, Wen Yinghong, Chen Hui, Liu Zhijie, Zhu Fengtian, Wang Longfei.
The previous versions of the standard replaced by this standard are as follows.
---GB 4824-1984, GB 4824-1996, GB 4824-2001, GB 4824-2004, GB 4824-2013.
Radio frequency disturbance characteristics of industrial, scientific and medical equipment
Limits and measurement methods
1 Scope
This standard applies to industrial, scientific and medical electrical (hereinafter referred to as engineering medicine) equipment with a working frequency in the range of 0Hz to 400GHz
And household and similar appliances designed to generate and/or locally use radio frequency energy.
This standard covers the emission requirements of radio frequency disturbances in the 9kHz~400GHz frequency band. However, it is only necessary to enter the frequency range specified in Chapter 6
Line measurement.
For the engineering and medical radio frequency applications defined in the International Telecommunication Union (ITU) (see definition 3.13), this standard covers 9kHz~18GHz
Radio frequency disturbance emission requirements in the frequency band.
Note. The emission requirements of induction cookers are in accordance with the requirements of GB 4343.1-2018.
This standard is also applicable to the technical medical radio frequency lighting equipment and purple radio frequency lighting equipment in the technical medical frequency band defined by the International Telecommunication Union (ITU)
Outside radiation equipment.
This standard does not apply to equipment that has been covered in other CISPR product categories or other product emission standards.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 4365-2003 Electrotechnical terminology electromagnetic compatibility (IEC 60050-161.1990, IDT)
GB/T 6113.102-2018 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-2.Radio disturbance
Coupling device for conducting disturbance measurement with immunity measuring equipment (CISPR16-1-2.2014, IDT)
GB/T 6113.104-2016 Radio disturbance and immunity measurement equipment and measurement method specification Part 1-4.Radio disturbance
Antenna and test site for radiated disturbance measurement with immunity measurement equipment (CISPR16-1-4.2012, IDT)
GB/T 6113.201-2018 Radio disturbance and immunity measurement equipment and measurement method specification Part 2-1.Radio disturbance
And Immunity Measurement Method Conducted Disturbance Measurement (CISPR16-2-1.2014, IDT)
GB/T 6113.402-2018 Radio disturbance and immunity measurement equipment and measurement method specification Part 4-2.Uncertainty,
Statistics and Limit Modeling Uncertainty of Measuring Equipment and Facilities (CISPR16-4-2.2014, IDT)
GB/T 31251.2-2014 Resistance welding equipment Part 2.Electromagnetic compatibility requirements (IEC 62135-2.2007, IDT)
3 Terms and definitions
The following terms and definitions defined in GB/T 4365-2003 apply to this document.
3.1
AC power port
A port used to connect a public low-voltage AC power distribution network or other low-voltage AC power devices.
3.2
Arc welding equipment
The equipment that applies current and voltage has the characteristics required for arc welding and similar processes.
3.3
Artificial power network
Provide a specified impedance network between the terminals of the equipment under test in the radio frequency range, which can connect the test circuit and the useless power supply
The radio frequency signal is isolated and the disturbance voltage is coupled to the measuring receiver.
Note 1.There are two basic types of artificial power networks, namely V-type for coupling asymmetric voltage and Δ for coupling symmetric voltage and asymmetric voltage.
The internet.
Note 2.The terms line impedance stabilization network (LISN) and V-type artificial power network can be used interchangeably.
3.4
Boundary of the device under test
An imaginary straight line boundary containing the simple geometry of the device under test.
Note. All interconnecting cables are included in this limit.
3.5
Components
It is expected to be used to assemble higher-level equipment or systems and provide one or more products with specific functions.
4 Frequency of use of engineering medical equipment
According to the International Telecommunication Union (ITU) assigned frequency table, my country assigns radio frequency applic...
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