When frequency sweeping method being used properly for measuring amplitude-frequency characteristics, the analysis and estimation of errors in measurement results could be avoided.

正确使用扫频法测量幅频特性，可以避免大量测量结果中误差的分析与估算。

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As compared with the methods of sine or sine frequency of sweeping, which was used in the past, this method has obvious advantages. It can meet the needs of production site of transmitters.

此方法较之以往采用的正弦或正弦扫频激励法具有明显的优点，可以满足传感器生产现场的需要。

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This paper introduced the design and development of a virtual frequency sweeper based on DDS technology. The DDS technology and the method to design the frequency sweeping generator were illustrated.

介绍了基于DDS技术的虚拟扫频仪的硬件与软件设计，并详述了DDS技术以及用该技术实现扫频信号源的方法。

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