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1.引言交流电压有效值的测量通常是通过将它与一个直流参考电压比较而实现的。单结或多结热电转换器(MJTC)是高准确度测量时常用的比较元件。当差分多结热电转换器的响应速度采用反馈技术提高后,它就较适合作为比较元件。由于加热丝的不匹配引起的误差,可以通过替代方法消除。在这种新型仪表中,差分多结热电转换器的其中一个加热丝是由未知的交流电压和一个自调节斩波直流电压交替加热的,而另一个加热丝的电压保持恒定。交流和直流电压每隔5s
1. Introduction AC voltage RMS is usually measured by comparing it to a DC reference voltage. Single-junction or multi-junction thermoelectric converters (MJTCs) are common comparators for high-accuracy measurements. When the differential multi-junction thermoelectric converter response speed using feedback technology to improve, it is more suitable as a comparison element. Errors caused by mismatches in heater wire can be eliminated by alternative methods. In this new meter, one of the heater wires of the differential multi-junction thermoelectric heater is alternately heated by an unknown AC voltage and a self-adjusting chopper DC voltage while the voltage of the other heater wire is kept constant. AC and DC voltage every 5s