On usual DMM only can measure signal's amplitude of DC and AC from fifty to five hundred Hz, it can not measure signal's frequency or amplitude of high frequency.
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声卡示波器软件实现了示波器，信号发生器，频率计，万用表的功能，在音频范围内可完全替代上述仪器。
Sound card oscilloscope software oscilloscope, signal generator, frequency meter, multimeter functions in the audio range can completely replace the equipment.
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