1 Scope
This part of GB17799 for emission requirements applies to electrical and electronic equipment intended for use within the environment existing at industrial (see 3.1 .1 2) locations.
This document does not apply to equipment that fall within the scope of GB 17799.3.
The environments encompassed by this document cover both indoor and outdoor locations.
Emission requirements in the frequency range 9 kHz to 400 GHz are covered in this document and have been selected to provide an adequate level of protection of radio reception in the defined electromagnetic environment. No measurement needs to be performed at frequencies where no requirement is specified. These requirements are considered essential to provide an adequate level of protection to radio services.
Not all disturbance phenomena have been included for testing purposes but only those considered relevant for the equipment intended to operate within the environments included within this document.
Requirements are specified for each port considered.
This generic EMC emission standard is to be used where no applicable product or product-family EMC emission standard is available.
NOTE 1 Safety considerations are not covered by this document.
NOTE 2 In special cases, situations will arise where the levels specified in this document will not offer adequate protection; for example where a sensitive receiver is used in close proximity to an equipment. In these instances,
special mitigation measures may have to be employed.
NOTE 3 Disturbances generated in fault conditions of equipment are not covered by this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.
GB 4824-2019 Industrial,scientific and medical equipment—Radio-frequency disturbance characteristics—Limits and methods of measurement
GB/T 6113.102-2018 Specification for radio disturbance and immunity measuring apparatus and methods—Part 1-2:Radio disturbance and immunity measuring apparatus—Coupling devices for conducted disturbance measurements
GB/T 6113.203-2016 Radio Disturbance and Immunity Measuring Equipment and Measurement Methods Specifications Part 2-3: Radio Disturbance and Immunity Measurement Methods Radiated Disturbance Measurement
GB/T 17626.20-2014 Electromagnetic compatibility.Testing and measurement techniques.Emission and immunity testing in transverse electromagnetic (TEM) waveguide
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
port
physical interface of the specified equipment with the external electromagnetic environment（See Figure 1.）
3.1.2
enclosure port
physical boundary of the equipment which electromagnetic fields may radiate through or impinge on
3.1.3
cable port
port at which a conductor or a cable is connected to the equipment
Note 1 to entry: Examples are signal, wired network, control and power ports.
3.1.4
wired network port
point of connection for voice, data and signalling transfers intended to interconnect widely-dispersed systems by direct connection to a single-user or multi-user communication network
Note 1 to entry: Examples of these include CATV, PSTN, ISDN, xDSL, LAN and similar networks.
Note 2 to entry: These ports may support screened or unscreened cables and may also carry AC or DC power
where this is an integral part of the telecommunication specification.
Note 3 to entry: A port generally intended for interconnection of components of a system under test (e.g. RS-232, RS-485, field buses in the scope of IEC 61158, IEEE Standard 1284 (parallel printer), Universal Serial Bus (USB), IEEE Standard 1394 (“Fire Wire”), etc.) and used in accordance with its functional specifications (e.g. for the maximum length of cable connected to it), is not considered to be a wired network port.
Note 4 to entry: In previous editions of this document and many product standards, this port was defined as a telecommunications or network port.
3.1.5
power port
port for the connection of the equipment to the primary electrical power supply
3.1.6
public mains network
electricity lines to which all categories of consumers have access and which are operated by a supply or distribution undertaking for the purpose of supplying electrical energy
3.1.7
low voltage； LV
a set of voltage levels used for the distribution of electricity and whose upper limit is generally
accepted to be 1 000 V AC or 1 500 V DC
[SOURCE: IEC 60050-601 :1 985, 601 -01 -26, modified – addition of the words "or 1 500 V DC"]
3.1 .8
DC distribution network
local supply network in the infrastructure of a site or building intended for use by one or more different types of equipment and providing power independent of the public mains network Note 1 to entry: Connection to a remote local battery is not regarded as a DC distribution network, if such a link comprises only power supply for a single piece of equipment.
3.1.9
low voltage AC mains port
port used to connect to the low voltage AC mains supply network to power the equipment Note 1 to entry: Equipment with a DC power port is considered low voltage AC mains powered if it is powered from an AC/DC power converter.
Note 2 to entry: The low voltage AC mains supply could be public or non-public.
3.1.10
highest internal frequency
Fx
highest fundamental frequency generated or used within the EUT, or the highest frequency at which it operates
3.1.11
small equipment
equipment, either positioned on a table top or standing on the floor which, including its cables fits in a cylindrical test volume of 1.2 m in diameter and 1.5 m above the ground plane
4 Test conditions
Based on the normal conditions of use of the equipment under test (EUT), measurements shall be made in the operating condition that produces the maximum emission in the frequency band under test. Under typical use and actual installation conditions, the configuration of the test sample should be varied to obtain the maximum emission. Pre-testing can be used to reduce the test time.
If the EUT is part of a system, or can be connected to auxiliary equipment, the EUT should be configured with a minimum of representative auxiliary equipment for the test to operate the port as described in similar provisions to GB4824-2019 or CISPR 32:2015.
The EUT should be arranged in accordance with the requirements of Table 1.
If external filtering and/or shielding is required in the manufacturer's specifications or other measures are specified according to the user manual, the tests in this document shall be performed with the addition of the specified devices and measures.
The configuration and operating status of the EUT during the measurement shall be accurately. This shall be recorded in the test report. If the EUT has many similar ports or some ports with many similar connections, then a sufficient number of ports and connections shall be selected to simulate the actual operating conditions and to ensure that all different types of terminals are covered.
Unless otherwise specified in the base standard, measurements shall be made at the temperature, humidity, atmospheric pressure, operating conditions and rated voltage in accordance with the product specification. The relevant conditions shall be recorded in the test report.
5 Product documentation
If special measures are required to comply with the requirements of the standard, for example the use of shielded or special cables, the purchaser/user/installer shall be informed in the product documentation.
6 Suitability
Emission measurements depend on the particular equipment and its configuration, port, process and operating conditions.
Measurements shall be made on the relevant ports available to the equipment in accordance with the requirements specified in Tables 3 to 5. Measurements should only be made for ports that are present. It is possible to determine which measurements are inappropriate and unnecessary depending on the electrical characteristics and use of the specific equipment. In such cases, the reasons for not measuring are to be recorded in the test report.
7 Measurement uncertainty
The uncertainty of measurement equipment and facilities shall be assessed in accordance with the relevant provisions in GB/T 6113.402-2018. The uncertainty of measurement equipment and facilities shall be in accordance with GB/T 6113.402-2018 when determining whether the measurement results meet the limits specified in this document. When the uncertainty of the measurement equipment and facilities in the laboratory is greater than the U... value given in GB/T 6113.402-2018, the measurement results shall be calculated in accordance with the uncertainty of the measurement equipment and facilities as specified in GB/T 6113.402-2018. values, the calculation of the measurement results as well as the adjustments shall be recorded in the test report.
8 Conformity to standards
This document provides a choice of test methods for special test requirements. Conformity to any of the test methods, using the corresponding limits provided in the relevant tables, may indicate its conformity to the standard. For example, considering that 3.2 in Table 3 is only applicable to small equipment and 3.3 is only applicable to bench top equipment, floor standing equipment should be assessed in accordance with 3.1 in Table 3.
Where repeated tests are required, the test method used for the first time should be selected to ensure consistency of results.
Equipment meeting the frequency bands specified in Tables 3 to 5 of this document is considered to meet the requirements for 9 kHz to 400 GHz.
9 Emission test requirements
The emission requirements for equipment covered in this document are given on a port-by-port basis and are shown in Tables 3 to 5. Appendix A, for information only, gives recommended limits for DC power ports.
Measurements should be carried out under fully deterministic and reproducible conditions and in any order.
The description of the measurement, the measurement equipment, the measurement method and the measurement arrangement are based on the referenced standards in Tables 3 to 5. These standards are not repeated here, however, modifications or additional information required for the actual measurements are given in this document.
Measurements in accordance with Tables 3 to 5 should be carried out in accordance with the following.
Appendix A (informative) DC power system tests
Appendix B (informative) Further information on measurements using FAR
Bibliography
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 Test conditions
5 Product documentation
6 Suitability
7 Measurement uncertainty
8 Conformity to standards
9 Emission test requirements
Appendix A (informative) DC power system tests
Appendix B (informative) Further information on measurements using FAR
Bibliography
