臺灣博碩士論文加值系統

本篇論文主要探討與使用數位示波器搭配電腦輔助運算之時域測量技術，測量的頻率範圍是從30MHz到250MHz。由天線接收待測物的輻射性電磁干擾的雜訊，因此，訊號取樣來自天線，經放大器將雜訊的訊號放大，以及低通濾波器將雜訊的頻率範圍過濾，再經由數位示波器將類比訊號轉換為數位訊號，傳送給電腦，然後執行LabVIEW程式，使用快速傅利葉將時域轉換為頻域，之後模擬頻譜的各種測量模式，如峰值檢測模式與平均值檢測模式，來測量輻射性電磁干擾的雜訊。最後，以頻譜分析儀驗證結果，比較時域與頻域量測的差異，以確認可以取代頻譜分析儀。由於時域量測技術允許對整個信號頻譜內的幅度與相位資訊進行平行處理，所以可以大幅縮短測量時間。

This article discussed and used a digital oscilloscope to do the measuring technology in the time domain while matching the auxiliary operation of the computer mainly. The measured frequency is from 30 MHz to 250 MHz. The antenna received the electromagnetic interference noise in radiated emission from EUT so the signals from the antenna are sampled. The amplifier amplified the signals, and the low pass filter filtered the signals in frequency range. Then the digital oscilloscope converted the analog signals to digital ones, and transmitted the signals to the computer. The computer controlled LabVIEW program to converter the measured signals from time-domain to frequency-domain with the fast Fourier transform (FFT). The system can simulate all kinds of measured modes in spectrum such as peak value and average value measurement modes so that it can measure the electromagnetic interference noise in radiated emission. Lastly using the spectrum analyzer carried out the measured result verification. Compared the difference between the time domain and the frequency domain measurements in order to check the system can replace a spectrum analyzer. Due to the system allows the parallel processing for the amplitude and the phase of whole spectrum range, it can reduce the measured time.

摘要 i
英文摘要 ii
誌 謝 iii
目 錄 iv
表 目 錄 vi
圖 目 錄 vii
第一章 緒論 1
1.1 研究動機 1
1.2 文獻回顧 1
1.3 研究方法與目的 2
1.4 研究大綱 2
第二章 電磁相容認證與量測介紹 4
2.1 電磁干擾介紹 4
2.2 電磁相容簡介 4
2.3 傳導性電磁干擾法規介紹 6
2.4 輻射性電磁干擾法規介紹 9
2.5 電磁耐受法規介紹 12
2.6 產品電磁相容認證介紹 12
2.7 頻域量測傳導性電磁干擾系統架構 14
2.7.1 量測儀器 15
2.7.2 LISN 16
2.7.3 量測環境 18
2.7.4 量測系統 19
2.8 頻域量測輻射性電磁干擾系統架構 22
2.8.1 量測儀器 22
2.8.2 量測環境 24
2.8.3 量測系統 25
2.9 本章結論 26
第三章 頻域量測傳導性電磁干擾驗證與比較 27
3.1 簡介 27
3.2 電流探棒量測頻域的傳導性電磁干擾 28
3.3 功率結合器量測頻域的傳導性電磁干擾 32
3.4 電流探棒與功率結合器量測比較 35
3.5 本章結論 43
第四章 時域量測輻射性電磁干擾 44
4.1 簡介 44
4.2 時域量測輻射性電磁干擾架構 45
4.3 時域量測輻射性電磁干擾系統程式 47
4.3.1 程式面板部份 48
4.3.2 人機介面部份 54
4.4 時域量測環境 59
4.5 時域量測方式 60
4.5.1 資料的處理過程與取得 60
4.5.2 量測系統的誤差修正 61
4.5.3 檢波器的模式 62
4.5.4 使用快速傅利葉轉換做訊號處理 63
4.5.5 動態範圍 67
4.6 本章結論 68
第五章 時域量測輻射性電磁干擾驗證與比較 69
5.1 在開放空間的量測結果驗證與比較 69
5.2 在室內3公尺實驗室的量測結果驗證與比較 72
5.3 本章結論 75
第六章 總結 77
6.1 本論文的貢獻 77
6.2 未來努力方向 77
參考文獻 78

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