Measurement conditions: Within the frequency range under investigation, the tested equipment (EUT) should be measured in the operating state that produces maximum emission, such as based on limited predictive testing and normal usage conditions. Under typical usage and actual installation conditions, change the configuration of the test sample to obtain maximum emission. If the test equipment is part of the system or can be connected to auxiliary equipment, the test equipment needs to be equipped with the least representative auxiliary equipment during measurement, in order to use ports according to regulations similar to GB 4824 or GB 9254. If the manufacturer requires external filtering and/or shielding devices or measures specified in the user manual, the testing in this section should be carried out with the specified devices and measures added. The configuration and working status of the tested equipment during the measurement period should be correctly recorded in the inspection report. If the device has many similar ports or some ports have many similar connections, then a sufficient number of ports and connections should be selected to simulate the actual working state to ensure coverage of all different types of terminals. If applicable, please refer to IEC/CISPR 16-2 series and GB 4824 and GB 9254 for relevant information on EUT arrangement. Unless otherwise specified in the basic standard, measurements should be made at the rated voltage under the specified temperature, humidity, and atmospheric pressure operating conditions of the equipment If special measures must be taken to comply with standard requirements in product documents, such as the use of shielded or specialized cables, the purchaser/user should be informed. The applicability of emission measurement depends on the specific equipment and its configuration, ports, processes, and operating conditions. The relevant ports of the equipment should be measured according to the provisions of Tables 1 to 3. Only measure existing ports. It is possible to determine which measurements are inappropriate and unnecessary based on the electrical characteristics and usage of specific equipment. In this case, the reasons for not measuring should be recorded in the inspection report. The emission requirements of the equipment involved in this section are given one by one by port. The measurement of each type of harassment should be conducted under fully determined and reproducible conditions. Measure in any order. The emission requirements of the equipment within the scope of application of this section are specific to the port. The relevant requirements are shown in Tables 1 to 3. Testing equipment, testing methods, and testing layout instructions refer to the basic standards in Tables 1 to 3
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