Professional test equipment is used. The equipment has passed the verification of iec61000-4-30 class a standard of the International Electrotechnical Commission. The measurement voltage accuracy is 0.1%, the measurement current accuracy is 1%, the harmonic measurement is 2-50 times, and the high-frequency harmonic measurement is 2-9khz. It meets the requirements of GB / T 20320-2013 wind turbine test standard, and has the calibration certificate of the National Institute of metrology of China (within the validity period), Ensure that the test data are accurate and valid. Professionals carry equipment for entrance test, and provide 48 hour rapid entrance service nationwide.