General load is divided into three categories, and resistive load (such as bulb), capacitive load (such as switching power supply) and inductive load (such as electric fan) · for sine wave, these three types of load can be used, but for continuous power system, it is not recommended to use on inductive load, because the starting current of inductive load is large, which will shorten the life of electronic parts In addition to the large starting current, the back EMF of the inductive load is the fatal injury of the step wave. As for the capacitive load, it needs higher peak voltage to drive, and the step wave product just has the characteristics of high peak value, but because the step wave has the step wave component, for some instruments, it may cause reading error or misoperation due to the step wave interference<br>
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