Yokogawa DAQWORX - Manual (Page 16)

1-10 IM WX13-01E
1.1 Overview of Functions
Terminology for the Period of Data That Is Saved When Setting the
Pretrigger
Data held before the start trigger
The area held in the internal memory that is prior to the point when the start trigger
condition is met.
Pretrigger width
The period including the number of pretrigger data specified in the start conditions.
Pretrigger width = scanning interval x recording rate x pretrigger count.
Data saving period
The period during which data is saved.
Start trigger point
The point in time at which the start condition changes from being unmet to being met.
Stop trigger point
The point in time at which the stop condition changes from being unmet to being met.
Start point of data saving
The first data of the data saving period.
Specified width for data saving
The period including the number of data specified in the stop conditions.
Specified width for data saving = scanning interval x recording rate x data count.
When the Stop Condition Is Set to Alarm Trigger, Level Trigger, or Fixed
Time
When the stop condition is set to Alarm Trigger, Level Trigger, or Fixed Time, data are
saved from the number of data specified for the pretrigger that are prior to the start
trigger point (start point of data saving) up to the start trigger point. Then, scanning is
performed on the data from the start trigger point up to the point specified in the stop
conditions, and that data is saved. In this case, the relationships between the data held
before the start trigger and the pretrigger width are shown in the figure below.
Data held before the start trigger > pretrigger width (most common
case)
Data held before the start trigger
Pretrigger width
Start point of data saving
Start trigger point Stop trigger point
Time
Data saving period
Data held before the start trigger < pretrigger width
Data held before the start trigger
Pretrigger width
Start point of data saving
Start trigger point Stop trigger point
Time
Data saving period