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flecker vt.= fleck.

flection

Monitor apparatus can measure valid value of three phase voltage and current , power factor , three phase disequilibrium , instant flecker of short time and harmonic without twenty , degree and harmonic distortion total . the paper are laid on the following . ( 1 ) master plan and function of circuit , ( 2 ) hardware design including circuit and principle of a / d conversion , phase lock , liquid crystal display and keystroke and so on , ( 3 ) design of system software including digital filtering , fft , a / d conversion and monitor interface of pc , ( 4 ) system test 監測儀能夠完成包括三相電壓、三相電流的有效值、功率因數、三相不平衡、電壓短期閃變、以及20次內的諧波、諧波相位、諧波失真總量等的測量。論文重點介紹了以下幾部分: ( 1 )電路的總體設計和功能; ( 2 )硬件設計,包括a d轉換、鎖相環、液晶顯示和按鍵輸入等原理和電路。 ( 3 )系統軟件設計,包括a d轉換、 fft 、數字濾波等程序的原理和算法以及上位機監控界面的設計; ( 4 )系統測試。