EMC testing refers to the comprehensive evaluation of electromagnetic interference(EMI)and anti-interference capability(EMS)of electronic products.The purpose of EMC testing is that electrical equipment should be able to operate normally in a certain electromagnetic environment,that is,have a certain electromagnetic immunity(EMS);The electromagnetic interference(EMI)generated by electrical equipment itself cannot have a significant impact on other electronic products.EMC is one of the most important indicators of product quality;Many electrical products require EMC certification in order to be produced and sold.

Electric energy meters are electronic products and measuring products.EMC testing is required by GB/T 17215.211-2021 and IEC62052-11 2020 standards.Today,the editor will give you a brief understanding of EMC's project requirements

1.Electrostatic discharge immunity test:The electrostatic discharge test includes direct discharge test(8kV)and indirect discharge test(15kV);In the operating state where the electric energy meter only supplies working voltage,the discharge frequency is more than 10 times.

2.Radio frequency electromagnetic field immunity test:The cable length exposed to the electromagnetic field is 1m,with a frequency range of 80MHz~2000MHz,and 80%amplitude modulation carrier modulation on a 1kHz sine wave.The unmodulated test field strength with load current is 10V/m,and the unmodulated test field strength without load current is 30V/m.

3.Fast transient pulse train:When the electric meter is in operation,the test voltage on the current and voltage lines is 4kV;the test voltage on the auxiliary lines with a voltage exceeding 40V is 2kV;the test time is 60s for each polarity.

4.Conducted disturbance immunity test induced by radio frequency field:When the electric meter is in operation,the radio frequency field frequency is 150kHz~80MHz and the voltage is 10V.

5.Surge immunity test:In the operating state where the energy meter only supplies working voltage,the test voltage on the current and voltage lines is 4kV,and the test voltage on the auxiliary lines with a voltage exceeding 40V is 1kV;the positive and negative polarities are tested 5 times each.

6.Attenuation oscillation wave immunity test:only for electric energy meters that operate through transformers,when the meter is in operation,the test voltage on the voltage line and auxiliary line with a reference voltage exceeding 40V:common mode mode 2.5kV,differential mode 1.0kV;test frequency 100kHz,repetition rate 40Hz,1MHz,repetition rate 400Hz

7.Radio interference suppression:When the energy meter is in operation,the current is between 0.1Ib and 0.2Ib;The test results should comply with the requirements specified in GB9254

Electronic energy meters are a livelihood issue related to measuring products,and different countries and regions have their own standard certification requirements,such as MID,CPA,CE,UKCA certification;These certifications all have EMC testing requirements,and only after passing the certification can they be sold in the market.As a high-quality electric energy meter manufacturer,it is necessary to have a complete set of testing equipment.Yongtailong conducts standard tests during product development and has established a CNAS laboratory.