在周期性方波激励下，电路中产生衰减振荡波形。

If the pumping signal is the periodic square wave, the damped oscillation wave will be generated in the circuit.

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通过测取振荡波形的振幅和周期，求取系统临界振荡的参数。

Evaluation of parameters at critical oscillations can be obtained by measuring the amplitudes and the periods therein;

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计算并绘出了非稳区域边界，分析了非稳振荡波形变化规律及其模结构。

The regularity of the change of the unstable oscillation wave form and the structure of the power spectrum were analysed.

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