ABSTRACT
An RLC series circuit consisting of a resistor (R), an inductor (L), and a capacitor (C) is a very typical circuit in college electric course. The circuit is widely used in radio, television, jamming and anti-jamming for it has a frequency-selective property. Alternating voltage is not often measured accurately because of sampling error. The reading error often reaches to 1%. Therefore, measuring magnitude-frequency response accurately is dicult. For an RLC series circuit with low quality factor, the resonance frequency f0 cannot be measured accurately through measuring the maximum voltage at the resistor, because the magnitude change of resistor voltage is not sensitive to the frequency change at f0. But the measurement of cuto frequencies fL and fH is more accurate. The magnitude-frequency dierence response for the RLC series circuit is studied as follows. Through this dierence response study, the measurement precision of magnitude-frequency response is analyzed.
