邵瑩瑩實驗07-測RLC電路頻譜特性實驗

1、實驗7 測RLC電路頻譜特性實驗一、 實驗?zāi)康?. 熟練掌握proteus仿真軟件中信號發(fā)生器和示波器的使用方法；2. 熟悉實際電路頻譜特性測量的原理。二、 實驗設(shè)備1. 計算機(jī)；三、 實驗原理如圖所示的R、L、C串聯(lián)電路中，當(dāng)正弦交流信號源的頻率 f改變時，電路中的感抗、容抗隨之而變，電路中的電流也隨f而變。 取電阻R上的電壓Uo作為響應(yīng)，當(dāng)輸入電壓Ui維持不變時， 在不同信號頻率的激勵下，測出Uo之值，然后以f為橫坐標(biāo)，以Uo為縱坐標(biāo)，繪出光滑的曲線，此即為幅頻特性，亦稱諧振曲線，如圖所示。四、 實驗內(nèi)容及步驟： 1、 打開proteus軟件，畫出如圖所示電路圖，接入函數(shù)信號發(fā)生器和數(shù)字示

2、波器。其中電感和電阻的值由你學(xué)號末位決定，如下表所示。學(xué)號末位RV1L101K220uH11K33uH21K4.7uH3470220uH447033uH54704.7uH6220220uH722033uH82204.7uH9100220uH2、 測量RLC電路的頻譜特性設(shè)置函數(shù)信號發(fā)生器，使得B點(diǎn)的輸出電壓為5V左右，輸出正弦波。改變頻率，測量C點(diǎn)輸出電壓和相對B點(diǎn)的相位差，記錄數(shù)據(jù)。實際電路測量結(jié)果：B點(diǎn)輸出頻率（KHz）0.10.20.30.40.50.60.70.80.91.0C點(diǎn)測量結(jié)果V/div11111讀數(shù)（div）55555電壓（V）55555增益（dB）00000BC相位差T/

3、div00000讀數(shù)（div）00000相位差（ms）00000相位差（弧度）00000B點(diǎn)輸出頻率（KHz）12345678910C點(diǎn)測量結(jié)果V/div1讀數(shù)（div）4.6電壓（V）4.6增益（dB）-0.72BC相位差T/div20u讀數(shù)（div）3相位差（ms）0.06相位差（弧度）1.2B點(diǎn)輸出頻率（KHz）102030405060708090100C點(diǎn)測量結(jié)果V/div1111111111讀數(shù)（div）4.63.832.621.81.41.211電壓（V）4.63.832.621.81.41.211增益（dB）-0.72-2.38-4.44-5.67-7.96-8.87-11.05

4、-12.4-13.97-13.97BC相位差T/div20u20u10u5u5u5u5u5u5u5u讀數(shù)（div）3231.210.80.80.80.60.6相位差（ms）0.060.040.030.0060.0050.0040.0040.0040.0030.003相位差（弧度）1.21.61.80.480.50.480.560.640.540.6B點(diǎn)輸出頻率（MHz）0.10.20.30.40.50.60.70.80.91.0C點(diǎn)測量結(jié)果V/div讀數(shù)（div）電壓（V）增益（dB）BC相位差T/div讀數(shù)（div）相位差（ms）相位差（弧度）3、 畫幅頻特性和相頻特性曲線把輸入頻率、增益和

5、相位差(弧度)輸入matlab，利用matlab做幅頻特性和相頻特性曲線。4、 根據(jù)曲線給出電路的截止頻率。五、思考與討論仿真結(jié)果：B點(diǎn)輸出頻率（KHz）0.10.20.30.40.50.60.70.80.91.0C點(diǎn)測量結(jié)果V/div1111111111讀數(shù)（div）5555555555電壓（V）5555555555增益（dB）0000000000BC相位差T/div1m1m100u20u20u20u20u20u20u20u讀數(shù)（div）0000000.10.10.20.2相位差（ms）0000000.0020.0020.0040.004相位差（弧度）0000000.00280.00320.

6、00720.008B點(diǎn)輸出頻率（KHz）12345678910C點(diǎn)測量結(jié)果V/div1111111111讀數(shù)（div）5554.94.94.84.74.74.64.5電壓（V）5554.94.94.84.74.74.64.5增益（dB）000-0.175-0.175-0.35-0.54-0.54-0.72-0.915BC相位差T/div20u20u20u20u10u10u10u10u10u10u讀數(shù)（div）0.20.40.40.5111111相位差（ms）0.0040.0080.0080.010.010.010.010.010.010.01相位差（弧度）0.0080.0320.0480.08

7、0.10.120.140.160.180.2B點(diǎn)輸出頻率（KHz）102030405060708090100C點(diǎn)測量結(jié)果V/div110.50.20.20.20.10.10.10.1讀數(shù)（div）4.53.559.575.59.5765電壓（V）4.53.52.51.91.41.10.950.70.60.5增益（dB）-0.915-3.09-6.02-8.4-11.05-13.15-14.42-17.07-18.41-20BC相位差T/div10u10u10u5u5u5u5u2u2u2u讀數(shù)（div）1111.51.3112.522相位差（ms）0.010.010.010.00750.0065

8、0.0050.0050.0050.0040.004相位差（弧度）0.20.44/30.60.650.60.70.80.80.8B點(diǎn)輸出頻率（MHz）0.10.20.30.40.50.60.70.80.91.0C點(diǎn)測量結(jié)果V/div0.150m20m10m5m5m2m2m2m2m讀數(shù)（div）533343543.22.2電壓（V）0.50.150.060.030.020.0150.010.0080.00640.0044增益（dB）-20-30.5-38.4-44.4-47.9-50.46-53.9-55.9-58.41-61.1BC相位差T/div2u1u1u1u0.5u0.5u0.5u0.5u

9、0.5u0.5u讀數(shù)（div）221.511.81.81.2111相位差（ms）0.0040.0020.00150.0010.00090.00090.00060.00050.00050.0005相位差（弧度）0.80.80.90.80.91.080.840.80.91x=0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1,2,3,4,5,6,7,8,9,10,20,30,40,50,60,70,80,90,100,200,300,400,500,600,700,800,900,1000;y1=0,0,0,0,0,0,0,0,0,0,0,0,-0.175,-0.175,-0.35,-0.54,-0.54,-0.72,-0.915,-3.09,-6.02,-8.4,-11.05,-13.15,-14.42,-17.07,-18.41,-20,-30.5,-38.4,-44.4,-47.9,-50.46,-53.9,-55.9,-58.41,-61.1;y2=0,0,0,0,0,0,0.0087,0.01,0.022,0.025,0.1,0.15,0.25,0.314,0.377,