Tektronix TPS2012B, User Manual

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Reference
Force Trig Button.
Use the Force Trig button to complete the current waveform
acquisition whether or not the oscilloscope detects a trigger. This is useful
for Single acquisitions and Normal trigger mode. (In Auto trigger mode, the
oscilloscope automatically forces triggers periodically if it does not detect a
trigger.)
Trig View button.
Use the Trig View mode to display the conditioned trigger
signal on the oscilloscope. You can use this mode to see the following types of
information:
Effects of the Trigger Coupling option
Signal connected to the Ext Trig BNC
NOTE. This is the only button that you must hold down to use. When you hold
down the Trig View button, the only other button you can use is the print
button. The oscilloscope disables all other front-panel buttons. The knobs
continue to be active.
Trigger Holdoff.
You can use the Trigger Holdoff function to produce a stable
display of complex waveforms, such as pulse trains. Holdoff is the time between
when the oscilloscope detects one trigger and when it is ready to detect another.
The oscilloscope will not trigger during the holdoff time. For a pulse train, you
can adjust the holdoff time so the oscilloscope triggers only on the
fi rst pulse in
the train.
To use Trigger Holdoff, push the Horiz ► Set Trigger Holdoff option button
and use the multipurpose knob to adjust the holdoff. The resolution of the trigger
holdoff varies depending on the Horizontal Scale setting.
TPS2000B Series Digital Oscilloscope User Manual 117