介质电阻率频率特性测试仪信号源设计

Design of signal source for the frequency characteristic test of dielectric resistivity

为了了解频率改变对介质电阻率的影响,提出了一种基于直接数字式频率合成(DDS)技术的介质电阻率频率特性测试仪信号源系统设计方案,并完成系统的软硬件设计。该系统使用MSP430F149控制AD9850产生频率可调的正弦波信号。经过测试表明,该系统能够为介质电阻率频率特性测试提供一个性能优良的信号源,达到了设计要求。

In order to understand the influence of frequency change on resistivity, put forward a kind of design scheme of signal source for the frequency characteristic test of dielectric resistivity based on Direct Digital Frequency Synthesis （DDS）, and complete hardware and software design of the system. The system uses MSP430F149 to control the AD9850 generating sine wave signal of adjustable frequency. After testing, the system can provide an excellent source for the test of the frequency eharacteristies of dielectric resistivity, reaehing the design requirements.