摘要
使用基于FFT的测量接收机的目的是将扫描时间缩短几个数量级,测量时间增加的可行性带来了更高的测量可靠性,增强型测量功能(如扫描瀑布图和余晖显示)使测量更具洞察力。为证明基于FFT的测量接收机的适用性,采用传统EMI接收机和基于FFT的时域扫描技术对CISPR 32范围内的多媒体设备进行了大量的比对测量。为使测量更精确和可重复,建议使用预选滤波器。
The use of FFT-based measuring receivers is motivated by reducing the scan time by several orders of magnitude, a higher reliability due to the possibility of applying longer measurement times and to get more insight with enhanced measurement functions like the scan spectrogram and persistence display. To prove the applicability extensive comparison measurements on multimedia equipment in the scope of CISPR 32 were performed using both conventional EMI receiver and FFT-based timedomain scanning technique. For precise and reproducible measurements the use of preselection filters is highly recommended.
