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GW Instek GDS-800 Series User Manual User Manual

Page 29

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GDS-800 Series Digital Storage Oscilloscope Operation Manual

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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.

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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.

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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