To enhance the quality of manufacturing as responsibility, build national brand of measurement!
To enhance the quality of manufacturing as responsibility, build national brand of measurement!
THD是指总谐波畸变，不同标准定义不同：
1、GB/T 17626.7-2008电磁兼容 试验和测量技术 供电系统及所连设备谐波、谐间波的测量和测量仪器导则对THD定义如下：
按照上述定义，THD不包含间谐波。
2、GB/T12668.2-2002调速电气传动系统 一般要求 低压交流变频电气传动系统额定值的规定 对THD定义如下：
按照上述定义，THD包含间谐波和直流分量。
WP4000变频功率分析仪的THD的定义式采用后者，而THD_F的定义采用前者，其中上限频率F可由用户设定。
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Research and development unit of national variable frequency power metering standard