当快门被设置为高速曝光，像1/200秒或更快时，两部分幕帘系统就相互配合完成。
When the shutter has been set for a very short exposure period, such as 1/200th sec or faster, the twin curtain system comes into its own.
度过由快门速度设置的曝光时间后，后幕帘落下闭合，曝光停止。
After a period determined by the set shutter speed, the rear curtain now drops to close the camera to light and end the exposure.
多通道数字化快门速度测试仪主要应用于幕帘式相机快门有效曝光时间的测试。
The multichannel digital shutter velocity tester is mainly used in measuring the exposure time of a camera curtain shutter.
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