1-19
IM 253710-01E
Functions
1
Trigger Mode «For procedures, see section 7.1.»
The trigger mode is used to set the conditions for updating the display. There are two
main modes, OFF mode and ON mode.
OFF mode
In this mode, the display record length of data is acquired to the memory from the
point at which the acquisition is started regardless of the trigger conditions. The
resultant data are displayed. This mode has the advantage of not requiring one to set
trigger conditions. However, a stable waveform display cannot be maintained.
Acquisition
memory
Display record length
Displayed on the screen
Start acquisition
ON mode
There are five types of ON modes. When the condition for the specific mode is
satisfied, the trigger occurs and the waveform display is updated.
As an example, we will consider the case when the trigger position (described in the
next section) and the trigger point are matched, and the trigger position is located on
the left end of the screen.
In this case, when a trigger occurs after the data acquisition is started, an amount of
data equal to the display record length is displayed starting from the trigger point.
Note
The following figure indicates the schematic of acquiring sampled data when a trigger occurs
and displaying the waveform on the screen.
2
Acquisition
memory
Start
acquisition
Continued
data
2
1
Trigger position
(Trigger point)
1
2
Displayed on the
screen
Acquisition
memory
Start
acquisition
Display record
length
Trigger position
(Trigger point)
Displayed on the
screen
Remaining
record length
When the display record length is longer than the
remaining record length after the trigger point
When the display record length is shorter than the
remaining record length after the trigger point
Remaining
record length
Trigger point
Trigger point
Display record
length
1.4 Trigger