DESP2045 / week 5, report due in two weeks

Laboratory 1 — spectrum of a square wave

Aim

Measure the harmonic content of a square wave and compare it with the Fourier series prediction.

Equipment

Function generator, oscilloscope, spectrum analyser, coaxial cables, 50 Ω terminations. Bench assignment is on the door of Lab C-1.

Procedure

1. Set the generator to 1 kHz square wave, 1 V peak-to-peak.
2. Record the amplitudes of the first five harmonics.
3. Repeat with a 10 kHz square wave and note where the measurement departs from the prediction.
4. Explain the departure: instrument bandwidth, cable loss, or something else.

Report

Two pages: a table of measured and predicted amplitudes, one figure, and a short discussion of the discrepancy. Hand in at the office or by email; late submission loses 10% per working day.