Data Sheet

RIGOL 5 To Trigger the Oscilloscope
MSO4000/DS4000 User’s Guide
5-4
the data acquired just before the trigger. If no trigger is found, the oscilloscope will
force a trigger. If the forced trigger is invalid, the oscilloscope still displays waveform
but the waveform will not be stable. If the forced trigger is valid, the oscilloscope
displays a stable waveform.
This trigger mode is applicable to low-repetitive-rate signals and unknown signal
levels. To display DC signals, you must use auto trigger mode.
Note: When the horizontal time base is set to 50 ms/div or greater, this trigger mode
allows the absence of trigger signal.
Normal:
Displays a waveform when the trigger condition is met. Otherwise, the oscilloscope
holds the original waveform and waits for the next trigger.
In this mode, the oscilloscope fills the pre-trigger buffer first and then search for a
trigger while at the same time continues filling data. While searching for the trigger,
the oscilloscope overflows the pre-trigger buffer and the first data put into the buffer
is first pushed out (FIFO). When a trigger is found, the oscilloscope will fill the
post-trigger buffer and display the acquisition memory.
Use normal trigger mode for low-repetitive-rate signals or when auto trigger is not
required.
Note: In this mode, pressing FORCE can generate a forced trigger signal.
Single:
When this mode is selected, the backlight of the SINGLE key turns on. The
oscilloscope waits for a trigger and displays the waveform when the trigger condition
is met and then stops.
Note: In this mode, pressing FORCE can generate a forced trigger signal.