计数式频率计的选通门一般与被测信号是不相关的。

The strobe signal is not commonly associated with the signal tested.

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当被测信号频率较低时，需要很宽的选通门才能得到较高的测量精度。

If the signal frequency to be measured is low, wide strobe gate is required for high measurement precision.

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本文给出了距离选通光子计数系统的信噪比模型并讨论了激光回波与探测器选通门之间的同步问题。

This article provides the signal-to-noise ratio module of the range-gating photon counting system and discusses the synchronization between the laser echo wave and the detector gate.

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