摘要
为进行阻抗集总参数的快速准确测量,对传统的矢量法进行改进,将矢量法和复数方程相结合,先由矢量法计算出阻抗的实部和虚部,然后将实部和虚部代入矢量方程计算出电阻R、电感L和电容C。硬件方面使用16位A/D转化芯片ADS8365进行同步采样,32位浮点DSP处理器TMS320F28335进行FFT运算。矢量方程离线计算,改进后的算法简洁高效。试验表明装置在低频信号下对电阻R和电感L的测量误差在2%以内,在高频信号下,对电容C的测量误差在5%以内。为建立分布式测量系统的需要,测量仪设计了CAN总线接口电路,可以方便地挂接在CANBUS上,增强了装置的扩展性能。
In order to make impedance lumped parameter measurement rapidly and exactly,traditional method of vector was improved,combining vector method with complex equation. First,vector method was used to calculate the real part and imaginary part of the impedance. Then the real part and imaginary part were put into vector equation to calculate the resistance R,inductance L and capacitance C. 16 bit A / D conversion chip ADS8365 was used to synchronized sampling,and 32-bit floating point DSP signal processor TMS320F28335 was used to conduct FFT arithmetic. The vector equation used off-line calculation,and the improved algorithm was concise and effective. Experiments showed that under the low frequency signal the measurement error of resistance R and inductance L is within 2%,and under the high frequency signal the measurement error of the capacitance C is within 5%. In order to satisfy the need of distributed measurement system,the CANBUS interface circuit was designed,and can be articulated on CANBUS,thus enhancing the device extension performance.
出处
《仪表技术与传感器》
CSCD
北大核心
2015年第6期34-37,62,共5页
Instrument Technique and Sensor
关键词
阻抗测量
矢量法
矢量方程
FFT
DSP
impedance measurement
vector method
vector equation
FFT
DSP
