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The limit of this method is that the sine wave generator with high performance is necessary, especially the stability, the noise and distortion of generator.
其局限性则是对交流信号源要求较高，要求高稳定性、低噪声及低失真度；
The system adopts direct digital synthetic (DDS) technology for building the sine wave generator to realize continuous regulation of amplitude, frequency and phase modulation.
系统采用直接数字合成（DDS）技术构建正弦波发生器，实现幅值、频率、相位等连续调节；
The sine wave inspection method is limited by condition, does not have the sine-wave-generator or the frequency is not precise, is not easy to realize.
正弦波检查法因条件所限，无正弦波发生器或频率不准，不易实现。
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