The front panel controls allow the user to set pulse width and frequency independently, or to set frequency and duty cycle, which then sets the pulse width accordingly.

前面板控制允许用户设置脉冲宽度与频率或先设置频率与占空因数，再设置脉冲宽度。

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The red pulse and resulting frequency spectrum are clearly different than the correct blue pulse and resulting frequency spectrum with pretrigger delay.

红色脉冲及所得频谱与具有预触发延迟的正确的蓝色脉冲及所得频谱显然是不同的。

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It is indicated from the results that effected by the high frequency group pulse power, higher machining quality is obtained by choosing higher main pulse frequency.

结果表明，在高频群脉冲电源作用下，选择较高的主脉冲频率，可获得良好的加工质量。

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The machine that Dr O'Brien and Dr Frazier have designed to get round these constraints consists of a transmitter that sends out a pulse of sound at a frequency of 6 kilohertz, and an array of 52 receivers that collect the reflections from anything buried beneath the surface.

ECONOMIST: Archaeology