Objective
The behavior of LCR low-pass filters are studied by measuring the frequency response and step response.

Principle
The cut-off frequency (or phase resonance frequency) is determined by using the oscilloscope in XY mode.
Frequency response: The amplitude of a sine wave signal is measured before and after passing the filter. The ratio of
the signal amplitudes are plotted in a logarithmic coordinate system.
Step response: A square wave signal is used as input and the output is studied on an oscilloscope.