GW Instek GDS-800 Series User Manual - Manual (Page 29)

GDS-800 Series Digital Storage Oscilloscope Operation Manual
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z Auto: In this mode, the oscilloscope will generate an internal trigger in the
absence of other trigger events. Also, select Auto trigger mode when you want
an un-triggered, rolling waveform at 250ms/div or slower timebase settings. This
mode is able to continuously observe low speed phenomena in real time down to
a speed of 10s/div.
z Normal: Normal trigger mode enables the oscilloscope to acquire a waveform
only when instrument is triggered. If no trigger occurs, the instrument will not
acquire waveform.
z Single: Press F3 softkey to trigger on the next valid trigger event and then stop.
If a trigger is required again, just press the RUN/STOP pushbutton. Signal shot
events are waveforms that happen only once or infrequently. In order to capture
a signal shot events, user needs to have knowledge of the waveform, which is
trying to capture. Before user can setup the trigger, vertical, and horizontal
controls to capture and display event, user must know the approximate
amplitude, duration, and DC offset of the signal.
The trigger status (Page 13, item 5) indicates the following:
Trig’d: The oscilloscope displays acquired waveform only after all of the trigger
conditions are met.
Trig?: The absence of triggers for normal and single mode.
Figure 5-13: The absence of triggers for normal and single mode