A resonance curve is a graph that shows the response of a circuit, typically represented by its voltage or current, as a function of frequency. It highlights the frequencies at which the circuit naturally oscillates with maximum amplitude.
The resonant frequency of a circuit is determined by the values of its inductance (L) and capacitance (C). It can be calculated using the formula f_r = 1 / (2π√(LC)), where f_r is the resonant frequency.
To measure the resonance curve, you need a signal generator to provide the input frequencies, an oscilloscope to measure the output response, and possibly a frequency counter to ensure accurate frequency readings. Additionally, the circuit under test should be properly set up and connected.
First, set up the circuit and connect it to the signal generator and oscilloscope. Then, sweep the input frequency from 6 kHz to 10 kHz in small increments. At each frequency, record the output amplitude. Plot these amplitude values against their corresponding frequencies to produce the resonance curve.
The shape of the resonance curve provides insights into the circuit's characteristics. A sharp peak indicates a high Q-factor, meaning the circuit has low energy loss and is highly selective. A broader peak suggests a lower Q-factor, indicating higher energy loss and lower selectivity. The position of the peak indicates the resonant frequency of the circuit.