1、微分干擾和工頻干擾的消除：

 

　　1.Elimination of differential interference and power frequency interference:

 

　　信號中往往同時存在微分干擾和工頻干擾信號，在信號處理電路中的低通濾波往往很難將工頻干擾完全濾出。本公司采用同步采樣和工頻補償技術，以抑制流量信號電勢中混入工頻干擾和工頻電源頻率波動產生工頻干擾，并有效除微分干擾。同步采樣技術，采樣開始時間滯后激磁信號1/4個周期，其采用脈寬為工頻周期的偶數倍，消除微分干擾的同時使流量信號電勢中工頻干擾平均值等于零，以消除工頻干擾的影響；工頻電源的頻率波動補償是保證頻率的動態波動中，激磁電源和采樣脈沖得以同步調整，真正實現同步采樣技術和同步激磁技術，同步A/D轉換，降低了微分干擾和工頻干擾的影響。

 

　　There are often differential interference and power frequency interference signals in the signal,and it is often difficult to completely filter the power frequency interference by low-pass filtering in the signal processing circuit.The company adopts synchronous sampling and power frequency compensation technology to suppress the power frequency interference mixed with the power frequency interference and the power frequency power frequency fluctuation in the flow signal potential,and effectively eliminate the differential interference.Synchronous sampling technology,the sampling start time lags behind the excitation signal by 1/4 cycle.The pulse width is an even multiple of the power frequency cycle to eliminate differential interference and make the average power frequency interference in the flow signal potential equal to zero to eliminate power frequency interference.The frequency fluctuation compensation of the power frequency power supply is to ensure that the excitation power supply and the sampling pulse can be adjusted synchronously during the dynamic fluctuation of the frequency.The synchronous sampling technology and the synchronous excitation technology are truly realized,and the synchronous A/D conversion reduces the differential interference and the power frequency.The impact of interference.

 

　　2、零點漂移消除：

 

　　2.Zero drift elimination:

 

　　所謂零點漂移，就是當傳感器的輸入信號為零時，放大器的輸出并不是零。零點漂移的信號會在各級放大的電路間傳遞，經過多級放大后，在輸出端成為較大的信號，由于傳感器輸出的有用信號較弱，零點漂移就可能將有用信號淹沒，使電路無法正常工作。因此為了抑制零點漂移，采用三運放的差動電路輸入，實現對大內阻的微弱信號采集，以抑制共模信號的引入。一級放大電路之后采用隔直電容，濾除基線零點漂移，防止直流信號過大，超出A/D轉換的輸入范圍。

 

　　The so-called zero drift means that when the input signal of the sensor is zero,the output of the amplifier is not zero.The zero-point drift signal will be transmitted between the circuits of various levels of amplification.After multi-stage amplification,it will become a larger signal at the output end.Since the useful signal output by the sensor is weak,the zero-point drift may overwhelm the useful signal and make the circuit impossible.normal work.Therefore,in order to suppress the zero-point drift,the differential circuit input of three operational amplifiers is adopted to realize the collection of weak signals with large internal resistance to suppress the introduction of common-mode signals.After the first-stage amplifying circuit,a DC blocking capacitor is used to filter the baseline zero drift to prevent the DC signal from being too large and exceeding the input range of the A/D conversion.

 

　　3、去除干擾的其他措施：

 

　　3.Other measures to remove interference:

 

　　對于由污水流量計傳感器的“變壓器效應”所產生的正交干擾，采用“變送器調零法”來消除。軟件設計方面，采用數字濾波技術與掉電保護技術，軟件指令冗余措施，可有效提高輸入微處理器數字的可靠性。

 

　　For the orthogonal interference generated by the"transformer effect"of the sewage flowmeter sensor,the"transmitter zeroing method"is used to eliminate it.In terms of software design,the use of digital filtering technology,power-down protection technology,and software instruction redundancy measures can effectively improve the reliability of input microprocessor numbers.

 

　　以上是我們總結的幾個去除漂移的方法，如果您在污水流量計使用時有更好的方法，也請聯系我們與我們共同分享，我們非常感激您的合作態度。

 

　　The above are a few methods we have summarized to remove drift.If you have a better method when using sewage flow meters,please contact us and share with us.We are very grateful for your cooperative attitude.

       華恒資訊：威力巴流量計應用領域，看看用過的人怎么說？