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2.7 Trigger Modes
The USBscope50 can use three main types of triggering. These
modes are used when the “run” button or the “once
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” button has
been pressed causing the scope to enter the run state.
2.7.1 Auto Triggering
In this mode the acquisition begins just after the software has set up
the scope. The scope will effectively free run, but it will try
periodically to trigger from the input waveform. If a trigger is
detected the scope will stay in a mode to enable it run as though it is
in Normal mode (see below). This means the scope will lock to the
waveform. If no trigger is detected the scope will carry in in a Free
Run mode. Note that when you adjust the trigger threshold or the
timebase, the scope will shorten the time until the next trigger test so
that it can lock to the waveform more rapidly as you adjust these
settings. If the scope looses lock on the waveform, you will observe
a brief delay (1 to 2 seconds) before the Free Run mode is resumed.
In Auto mode, when triggering is detected, the trigger status panel
will illuminate red.
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The once button does a single acquisition and so does not perform any trigger test when in Auto
mode. Effectively, using the once button in Auto mode is the same as using it in Free mode. In Norm
mode, the scope will wait for the trigger event during a “once” acquisition.
Elan Digital Systems Ltd. 21 USBscope50 USER’S GUIDE Iss5