ERP参数，参数转换，系统偏差。
作者认为只有少部分模拟示波器的转换系数偏离0．35，而相当多的数字式示波器的偏差较大。
The author considered these factors deviated away from 0.35 infew analog oscilloscopes and many digital oscilloscopes.
由于转换过程的误差，加之吸附沥青的影响，导致计算值与实际值存有一定偏差。
Due to the error of the transformation and the influence of asphalt absorption, it leads to deviation between calculation results and real results.
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