交流谐振电路-王浩宇.doc

交流谐振电路（实验报告） P 王浩宇 实验数据 实验室给出数据：Vi=2V，L=0.2H，RL=80Ω（有问题！后面给予讨论），C=0.005μF 当R=400Ω时 f/kHz3.0373.4473.8164.0664.1104.2154.3104.4034.5184.605VR/V0.110.150.210.280.300.340.400.460.580.71f/kHz4.7104.8084.8564.9074.9515.005.055.115.205.31VR/V0.901.131.211.281.251.181.070.920.770.62f/kHz5.405.525.615.735.805.926.056.216.607.03VR/V0.540.440.390.340.310.270.240.220.170.14 谐振时：f0=4.928kHz, Vc=19.7V, VL=20.2V 当R=600Ω时 f/kHz3.0113.4153.8074.0074.1144.2074.3114.4094.5124.556VR/V0.180.240.350.420.480.540.640.740.870.93f/kHz4.6074.6494.7074.7584.8164.8524.9014.9585.015.06VR/V1.031.121.241.361.481.511.581.541.491.40f/kHz 5.135.165.205.315.435.515.645.735.815.92VR/V1.451.191.210.930.780.690.600.530.490.44f/kHz6.056.246.627.05VR/V0.400.350.280.23 谐振时：f0=4.920kHz, Vc=15.0V, VL=15.4V 数据处理 （1）作谐振曲线，由曲线测出通频带宽度 1. R=400Ω 由原始实验数据可得下表 f/kHz3.0373.4473.8164.0664.1104.2154.3104.4034.5184.605I/mA0.2750.3750.5250.7000.7500.8501.0001.1501.4501.775f/kHz4.7104.8084.8564.9074.9515.005.055.115.205.31I/mA2.2502.8253.0253.2003.1252.9502.6752.3001.9251.550f/kHz5.405.525.615.735.805.926.056.216.607.03I/mA1.3501.1000.9750.8500.7750.6750.6000.5500.4250.350 （其中I=VR/R） 以表中f为横坐标，I为纵坐标，在坐标轴上描点，得下图 图(1) 因为 ， 整理可得 即有 （其中A、B、C、D由电路中的元件唯一确定） 以这个为函数原型，利用图(1)中各点进行曲线拟合（借助origin7.5实现），得 图(2) Model: Chi^2/DoF= 0.00042 R^2= 0.99958 A=0.61036±0.00564 B=0.2082 ±0.00035 C=-10.016±0.01876 D=121.35335±0.18948 故可得 所以由该表达式可知，当kHz时，取最大值mA。 当=2.243mA时，得4.709kHz，5.130kHZ。 所以 kHz 2. R=600Ω 由原始实验数据可得下表 f/kHz3.0113.415