利用强迫振动扭摆方法测灵敏电流计临界外电阻

Measurement of external critical resistance of a galvanometer with forced vibration torsional pendulum method

把灵敏电流计的张丝及线圈作为扭摆 ,用正弦讯号发生器作驱动源 ,扭摆在驱动电流的作用下做受迫振动 .

A torsion pendulum which consists of hanging spring and coil for a galvanometer,can do forced vibration driven by sinusoidal current.Using the resonant frequency formula and relationship between total critical resistance and structure parameter for galvanometer,a formula of measuring external critical resistance for galvanometer is derived.