The oscilloscope can be used to produce Lissajous figures by having sinusoidal w

Question

The oscilloscope can be used to produce Lissajous figures by having sinusoidal waves fed into CH1 and CH2, and the TIME/DIV set to XY. This causes CH1 to be along the x-axis and CH2 to be along the y-axis. In essence, they are parametric curves given by

where f1 and f2 are the frequencies of the waves, and %u03C61 and %u03C62 are the phases of the waves.

For the simple case when f1 = f2 and %u03C61 = %u03C62 = 0, a straight line is produced. When f1 not equal to f2, an interesting curve is produced. The ratio of the nodes along the x-axis to that along the y-axis is the ratio of f2 to f1. This implies that a frequency can be accurately calibrated against a standard.

What is the ratio of the frequency in CH1 to the frequency in CH2? (Enter you answer as f1:f2.)

Explanation / Answer

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