发给学生design：newmeasureinductance(黄勇).ppt

Inductance 电感 C=1/i ωc : one over ωc Measure inductance Measure inductance with the resonance method experimental apparatus Inductance L (set value of L as 7mh) Oscilloscope X signal generator S capacitance box C, c=0.20,0.30,0.40,0.50,0.60, join 1and 2 resistance box R=? Attention Basic requirements： Measure inductance L independently Advanced requirements: Series circuit: amplitude method parallel circuit: phase method(Double wave form display method、lishayu figure method) (UR~U总) 、 (ULC~U总) * Scheme 方案 resistance 电阻、 capacitance 电容 Resonance 谐振 Series 串联 Vector diagram 矢量图 impedance 阻抗 voltage 电压 parallel circuit 并联电路 Real number 实数 Imaginary number 虚数 Phase lead 相位超前 phase lag相位滞后 Circuit 电路 Resonant 共振的，谐振的 Theory ：理论 Uncertainty 不确定度 Characteristics 特点 Numerator 分子 denominator 分母 oscilloscope 示波器 instrument error maximum: 仪器误差限 Turnknob：旋钮 short circuit ：短接 Relative uncertainty： 相对不确定度 Theoretic analysis：理论分析 Understand experiment principle Design scheme for measure（experimental procedure) Draw up Circuit diagram Make a data form Make data processing method clear Experiment Purpose: 1. Use resistance box R、 inductance L、capacitance box C、Signal generator S、oscilloscope X and so on to design a Circuit diagram for measure resonance frequency f0, and observe resonance phenomenon . 2. Calculate inductance value and write the expression of inductance 1 Experiment Principle: RLC Series resonant circuit ZL ZC Zr zL -zc Z串 D Ac circuit(Zr= r； ZL=iωL;ZC=1/i ωc) We can see out from Vector diagram： B A U R C r L Z串 C so.,current: Phase difference between Current and voltage : Vector diagram RLC Series circuit 1 Experiment Principle: RLC Series resonant circuit ZL ZC Zr zL -zc Z串 D when ωL=1/ωc， Z串 is minimum obviously， Series circuit is resonante，(why?) ,at same time, the Ac voltage between A and C is maximum. (this is the method) So, when we confirm the AC voltage between A