摘自帮助文档：
Signal Options
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Amplitude (1mV — 999 kV) — controls the signal’s voltage, measured from its DC level to its peak. If the leads are connected to the common and either the positive or the negative terminal, the wave’s peak-to-peak measurement is twice its amplitude. If the output comes from the positive and negative terminals, the wave’s peak-to-peak measurement is four times its amplitude.
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从该内容可见：
若接“common 和 positive / negative terminal”输出2倍幅值；
若接“positive和negative terminals”，输出是4倍幅值；
这是该器件的仿真参数。
