Another somewhat important test consideration for impact testing relates to the need for pretrigger delay.
锤击试验另一个比较重要的测试注意事项是关于预触发延迟必要性的。
2
The data sampling include two kind: free sampling adapted to random signal and pretrigger sampling adapted to impact signal.
数据采集包括自由采集和预触发采集两种，分别应用于随机信号和冲击信号的采集。
3
The red pulse and resulting frequency spectrum are clearly different than the correct blue pulse and resulting frequency spectrum with pretrigger delay.