示波器测量市电方法分析

Analysis on the method of measuring mains power with oscilloscope

用示波器测量市电波形,如果使用方法不当,可能会导致电网跳闸,示波器烧毁,甚至导致操作者触电等人身安全事故。作者经过对市电原理和示波器测量步骤的研究分析,总结提出采用示波器测量市电的三种方法,不推荐使用的浮地测量法、平常推荐使用的伪差分测量法以及专业的高压差分测量法。三种方法各有优劣,对使用者的要求也各有不同。浮地测量法对专业要求最高,操作者必须具备较强的专业知识,对初学者不推荐使用;伪差分法属于经济适用的测量方法;高压差分法最专业安全,对操作者无过多要求,但经济成本高。

Use an oscilloscope to measure the mains waveform.If it is used improperly,it may cause the power grid to trip,the oscilloscope to burn,and even cause personal safety accidents such as electric shock to the operator.After the research and analysis of the principle of mains and the measurement steps of oscilloscope,the author summarizes and proposes three methods of using oscilloscope to measure mains,the unrecommended floating measurement method,the commonly recommended pseudo-differential measurement method and the professional high-voltage differential measurement method.The three methods have their own advantages and disadvantages,and the requirements for users are also different.The floating measurement method has the highest professional requirements,and the operator must have strong professional knowledge.It is not recommended for beginners;the pseudo-difference method is an economical and applicable measurement method;the high-voltage differential method is the most professional and safe,and does not require too many operators.,but the economic cost is high.