摘要
相位是依附于电压、电流而存在的,传统相位测量方法中误差主要是由电压、电流信号幅值变化所引起的。为了提高相位测量精度,本文设计的电路在传统过零比较法基础上进行改进,剔除电压、电流等电量的影响。在相位量值溯源,电压电流幅值发生变化时,采用电位器调节过零比较器的比较电平保持零电位,减小测量误差,使测量误差保持在±0.01°~±0.02°范围。最后,通过试验对比本文与传统方法的测量误差,本文的方法具有更高的测量精度。
Phase is existed attached to the voltage and current, whose test error is mainly caused by amplitude change of voltage, current in traditional phase measurement. In order to improve the phase measurement accuracy, the conventional zero comparison method was improved by changing the circuit design, with eliminating the influence of voltage, current in this paper. When the amplitude of U and I changed in phase quantity traceability, the potentiometers was applied to adjusting the zero comparator to keep its comparative level zero to improve the measurement precision. The test error was kept in the range from ± 0.01 ° to ±0.02 °. Finally, it is proved that this new method has a higher accuracy than traditional method in experiment.
出处
《电测与仪表》
北大核心
2016年第S1期47-49,共3页
Electrical Measurement & Instrumentation
关键词
相位测量
量值溯源
电位器
比较电平
phase measurement
quantity traceability
potentiometers
comparative level
