6-12
IM 701510-01E
6.8
Setting the Trigger Mode
1.
Press the
MODE key
to display the trigger mode selection menu.
2.
Press the soft key corresponding to the desired trigger mode.
• Menu (DL1520)
• Menu (DL1540)
• Menu (DL1520L/DL1540L)
Explanation
Selecting the trigger mode
The following six trigger modes are available. The default is “AUTO”.
AUTO (Auto-mode)
Updates the displayed waveform each time a trigger is activated if the trigger condition has
become true within the time-out period of approximately 100 ms. Updates the displayed
waveform automatically if the trigger condition becomes false within the time-out period.
The roll mode will be activated irrespective of the trigger condition if T/div is set to a value
greater than 50 ms. However, the roll mode will not be displayed when the history memory
function is “ON”.
AT-LVL (Auto-level mode)
Updates the displayed waveform in the same way as auto-mode if the trigger condition has
become true within the time-out period. If the trigger condition becomes false, the trigger
level is automatically set to the median of the amplitude of the trigger source, and then the
waveform is displayed.
Auto-level mode is only valid, however, if the edge trigger has been selected as the trigger
type. Auto-mode operations are carried out even if auto-level mode has been selected for a
trigger other than an edge trigger. Furthermore, roll mode will be activated irrespective of
the trigger type if T/div is set to a value greater than 50 ms. However, the roll mode will not
be displayed when the history memory function is “ON”.
NORMAL (normal transmission mode)
Updates the displayed waveform only when the trigger condition becomes true. The
displayed waveform will not be updated if the trigger condition does not become true.
In this mode, it is not possible to judge whether the signal is input or the trigger level is
correct unless a trigger is activated. Furthermore, the ground level is not displayed even if
the input coupling is set to “GND”.
Furthermore, in this mode, roll mode display is never activated, whatever the T/div setting,
and waveforms are displayed only when a trigger is activated.
SGL(S) (Single short mode) : for DL1540, SINGLE (Single mode) : for DL1520,
DL1520L and DL1540L
When the START/STOP key is pressed and the trigger condition becomes true, the
waveform is updated once only and acquisition stops.
If the time-axis setting corresponds to roll mode, the oscilloscope generates a roll-mode
display. When the trigger occurs, the oscilloscope obtains data for the set record length and
then stops the displayed waveform.
For details about record length, refer to Appendix 2/Appendix 3.
Keys and Procedure
MODE key
Soft keys
