Edge Triggering
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3–25
is on and the display says Coarse Knobs in the upper right corner, the general
purpose knob speeds up significantly.
Holdoff is automatically reset to 0% when you change the main time base
time/division setting. However, it is not reset if you change the delayed time
base time/division (that is, Intensified or Delayed Only).
To force the oscilloscope to immediately start acquiring a waveform record even
without a trigger event, press the FORCE TRIG front panel button.
To trigger on the next valid trigger event and then stop, press SHIFT FORCE
TRIG. Now press the RUN/STOP button each time you want to initiate a single
sequence of acquisitions.
The trigger buttons and knob let you quickly adjust the trigger level or force a
trigger (see Figure 3–14). You use the following trigger controls for all trigger
types, except were noted.
To Set the MAIN LEVEL. To manually change the trigger level, turn the MAIN
LEVEL knob. It adjusts the trigger level (or threshold level) no matter what
menu, if any, is displayed.
To Set to 50%. To quickly obtain an edge trigger, press SET LEVEL TO 50%.
The oscilloscope sets the trigger level to the halfway point between the peaks of
the trigger signal. Set Level to 50% has no effect when the trigger type is video.
Note that the MAIN LEVEL knob and menu items apply only to the main trigger
level. To modify the delayed trigger level, use the Level item in the Delayed
Trigger menu.
To Force a Trigger. To force the oscilloscope to immediately start acquiring a
waveform record even without a trigger event, press the FORCE TRIG front
panel button.
To Force a Trigger
To Single Trigger
Triggering From the Front
Panel
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