When the effect of strengthening technology on material fatigue performance is investigated, up-and-down method is often adopted.

Also, this paper makes the serial experiment of the large samples up-and-down method with two details and takes the experiment data in note, and paints the up-and-down chart.

By comparing the advantage and disadvantage of ramp current with other methods, ramp current method and up-and-down method are used to test sensitivity of bridge-wire Electrical Initiating Device.