發(fā)布時間：2018-08-17 12:12

【摘要】：隨著電子行業(yè)的蓬勃發(fā)展，人們對電子元器件的精度要求越來越高。一款高精度、低成本、便攜式的電阻電容電感測試儀擁有巨大的應(yīng)用空間。本文在參考傳統(tǒng)測試儀器的基礎(chǔ)上，結(jié)合現(xiàn)代微處理器應(yīng)用，設(shè)計了一款滿足要求的RLC測試儀。在測試方法選擇上，本文詳細比較了交流電橋法、L-C諧振法和伏安法，最終選擇伏安法來設(shè)計RLC智能測試儀。設(shè)計的儀器中擁有信號發(fā)生器，能發(fā)出一系列頻率可調(diào)的交流波形，通過振蕩電路，將電感值L（或者電容C）變成相對應(yīng)的頻率信號f，利用單片機LM3S1138的內(nèi)部計數(shù)器進行采樣，記算產(chǎn)生方波的脈沖頻率，通過一系列的程序運算比對和信號反饋調(diào)節(jié)，單片機自動調(diào)整合適的量程和數(shù)值，，也可以通過鍵盤直接輸入選擇，計算出檢測的電感值或者電容值，最終將結(jié)果通過串行口傳到移位寄存器，在LCD屏上顯示出來。 本文首先介紹了國內(nèi)外檢測儀表的發(fā)展歷程，分析討論了國內(nèi)外檢測儀器的現(xiàn)狀和智能儀表的發(fā)展趨勢，然后介紹了電阻、電感和電容的一些基本參數(shù)和常用的測量方法，通過方案比較確定本課題的檢測原理。其中著重介紹以LM3S1138為主控制器構(gòu)成系統(tǒng)的內(nèi)部結(jié)構(gòu)和擴展功能，并對以MAX038為主要芯片的智能信號發(fā)生器的信號發(fā)生電路和控制電路詳細說明。并且重點研究了該系統(tǒng)的程序流程和實際應(yīng)用，包括頻率測量、RLC測量、人機通信和AD/DA等模塊。最后使用設(shè)計完成的測試儀測量具體的電阻、電感和電容值，記錄結(jié)果并對誤差進行了相應(yīng)的分析，結(jié)果表明設(shè)計的RLC測試儀基本達到了預(yù)期效果。
[Abstract]:With the rapid development of electronic industry, the precision of electronic components is required more and more. A high-precision, low-cost, portable resistive capacitance inductance tester has huge application space. Based on the reference of traditional testing instruments and the application of modern microprocessor, this paper designs a RLC tester which meets the requirements. In the selection of test methods, this paper compares the AC bridge method with the voltammetry method in detail, and finally chooses the voltammetry method to design the RLC intelligent tester. The designed instrument has a signal generator, which can send out a series of frequency adjustable AC waveforms. By oscillating circuit, the inductance L (or capacitance C) is changed into the corresponding frequency signal f, and the internal counter of single chip computer LM3S1138 is used to sample. The pulse frequency that produces square waves is recorded. Through a series of program comparisons and signal feedback adjustments, the single chip microcomputer automatically adjusts the appropriate range and values. It can also be selected directly by the keyboard to calculate the measured inductance or capacitance value. Finally, the result is transmitted to the shift register through the serial port and displayed on the LCD screen. This paper first introduces the development history of domestic and foreign measuring instruments, analyzes and discusses the present situation of domestic and international testing instruments and the development trend of intelligent instruments, then introduces some basic parameters and common measuring methods of resistance, inductance and capacitance. The detection principle of this subject is determined by comparing the schemes. The internal structure and extended function of the system composed of LM3S1138 as main controller are emphatically introduced, and the signal generation circuit and control circuit of intelligent signal generator based on MAX038 are described in detail. The program flow and practical application of the system are mainly studied, including frequency measurement, man-machine communication and AD/DA modules. Finally, the resistance, inductance and capacitance are measured with the designed instrument, and the results are recorded and the error is analyzed accordingly. The results show that the designed RLC tester basically achieves the desired results.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TM930.2;TP368.12

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本文編號：2187590