求助：IEC61000-4-12

hsj1027

  在IEC61000-4-12 2006版法规中关于测试相位的要求为in a range between 0° to 360° relative to the phase angle of the a.c. line voltage to the equipment under test, with a
tolerance of ±10°但在老版法规中为0-360度，以10度递加，现咨询应该怎样理解新版法规？