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PC00042-E

PC00042-E 

PC00042-E 

為了提高輸入信號的信噪比，常采用軟件數字濾波來提高有用信號真實性。對于有大幅度隨機干擾的系統，采用程序限幅法，即連續采樣五次，若某一次采樣值遠遠大于其它幾次采樣的幅值，那么就舍去之。對于流量、壓力、液面、位移等參數，往往會在一定范圍內頻繁波動，則采用算術平均法。即用n次采樣的平均值來代替當前值。一般認為：流量n=12，壓力n=4zui合適。對于緩慢變化信號如溫度參數，可連續三次采樣，選取居中的采樣值作為有效信號。對于具有積分器A/D轉換來說，采樣時間應取工頻周期（20ms）的整數倍。實踐證明其抑制工頻*力超過單純積分器的效果。

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