• 1. Standard frequencies: 标准频率
• 2. IEC standard frequencies: IEC标准频率
• 3. Standard frequencies and time signals: 标准频率和时间信号

更多释义

• 1.Standard Test Method for dielectric breakdown voltage and dielectric strength of D149 ASTM solid electrical insulating materials at industrial power frequencies.
  ASTM D149固体电绝缘材料在工业电源频率下的介电击穿电压和介电强度的试验方法。
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• 2.The system is controlled by chip microprocessor 8031 and can transmit standard sinusoidal waves with various frequencies and arbitrary time intervals according to various requirements.
  该系统采用8031单片机进行控制，根据控制命令可发出不同时间间隔、不同时间长度、不同频率的标准正弦波信号。
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• 3.By applying frequency analysis method to a standard active band-pass filter circuit, a formula to calculate characteristic frequencies is offered.
  根据标准有源带通滤波器原理，采用频域分析法，可得出有源带通滤波器的特征频率计算公式。
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