【摘要】 对电表测量值的准确性进行了研究。根据相对误差的定义,纠正了教材中测量值的最大相对误差表达式中的错误,分析了最大相对误差和实际相对误差的异同。指出使用电表进行测量时,测量值的准确性是由其实际相对误差而非最大相对误差决定的;并非电表的读数越接近满刻度,测量值的准确性就越高;使用电表进行测量时,电表的读数不必被限定在2/3Xmax以上。更多还原

【Abstract】 The accuracy of the measured value is studied in this paper.According to the definition of the relative error,the incorrect expression of the maximum relative error is corrected.The author analyses the distinction between the maximum relative error and the practical relative error.It is indicated that the accuracy of the measured value is determined rather by the practical relative error than by the maximum relative error.It is correct that the nearer the scale reading approaches the maximum,the more accurate the measurement is.The scale reading need not be required above 2/3Xmax.更多还原