一、前言现在许多数字电压表生产厂家面临数字化测量交流电压的真实有效值问题。大多数厂家利用带平方除法器的转换器或对数一反对数线路的转换器。对于最好的仪器,这种转换器的长期稳定性对应于0.1%的总误差。但带特制的热电转换器的 f_y Fluke 8506A 型数字电压表与它们不同,其总误差为0.016%,这相当于 I. Preface Many digital voltmeter manufacturers now face the problem of measuring the true RMS value of digital AC voltage. Most manufacturers use converters with a square divider or logarithmic-antilog converters. For the best instrument, the long-term stability of this converter corresponds to a total error of 0.1%. However, the f_y Fluke 8506A digital voltmeter with a special thermoelectric converter is different from them, with a total error of 0.016%, which corresponds to