邵莹莹实验07-测RLC电路频谱特性实验

1、实验7 测RLC电路频谱特性实验一、 实验目的1. 熟练掌握proteus仿真软件中信号发生器和示波器的使用方法；2. 熟悉实际电路频谱特性测量的原理。二、 实验设备1. 计算机；三、 实验原理如图所示的R、L、C串联电路中，当正弦交流信号源的频率 f改变时，电路中的感抗、容抗随之而变，电路中的电流也随f而变。 取电阻R上的电压Uo作为响应，当输入电压Ui维持不变时， 在不同信号频率的激励下，测出Uo之值，然后以f为横坐标，以Uo为纵坐标，绘出光滑的曲线，此即为幅频特性，亦称谐振曲线，如图所示。四、 实验内容及步骤： 1、 打开proteus软件，画出如图所示电路图，接入函数信号发生器和数字示

2、波器。其中电感和电阻的值由你学号末位决定，如下表所示。学号末位RV1L101K220uH11K33uH21K4.7uH3470220uH447033uH54704.7uH6220220uH722033uH82204.7uH9100220uH2、 测量RLC电路的频谱特性设置函数信号发生器，使得B点的输出电压为5V左右，输出正弦波。改变频率，测量C点输出电压和相对B点的相位差，记录数据。实际电路测量结果：B点输出频率（KHz）0.10.20.30.40.50.60.70.80.91.0C点测量结果V/div11111读数（div）55555电压（V）55555增益（dB）00000BC相位差T/

3、div00000读数（div）00000相位差（ms）00000相位差（弧度）00000B点输出频率（KHz）12345678910C点测量结果V/div1读数（div）4.6电压（V）4.6增益（dB）-0.72BC相位差T/div20u读数（div）3相位差（ms）0.06相位差（弧度）1.2B点输出频率（KHz）102030405060708090100C点测量结果V/div1111111111读数（div）4.63.832.621.81.41.211电压（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读数（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点输出频率（MHz）0.10.20.30.40.50.60.70.80.91.0C点测量结果V/div读数（div）电压（V）增益（dB）BC相位差T/div读数（div）相位差（ms）相位差（弧度）3、 画幅频特性和相频特性曲线把输入频率、增益和

5、相位差(弧度)输入matlab，利用matlab做幅频特性和相频特性曲线。4、 根据曲线给出电路的截止频率。五、思考与讨论仿真结果：B点输出频率（KHz）0.10.20.30.40.50.60.70.80.91.0C点测量结果V/div1111111111读数（div）5555555555电压（V）5555555555增益（dB）0000000000BC相位差T/div1m1m100u20u20u20u20u20u20u20u读数（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点输出频率（KHz）12345678910C点测量结果V/div1111111111读数（div）5554.94.94.84.74.74.64.5电压（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读数（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点输出频率（KHz）102030405060708090100C点测量结果V/div110.50.20.20.20.10.10.10.1读数（div）4.53.559.575.59.5765电压（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读数（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点输出频率（MHz）0.10.20.30.40.50.60.70.80.91.0C点测量结果V/div0.150m20m10m5m5m2m2m2m2m读数（div）533343543.22.2电压（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读数（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,