Stop/Single Key - HP 54710A User's Reference Manual

Front-Panel Features

Stop/Single Key

Stop/Single Key

Pressing the Stop/Single key causes the oscilloscope to stop acquiring data.
The status area of the screen displays the message "Acquisition Stopped."
Each subsequent press of the Stop/Single key rearms the trigger circuit. The
next trigger event causes the oscilloscope to make a single acquisition, any
measurements are recalculated, and the status area of the screen displays the
message, "Acquisition Complete." If all of the channels are turned off or if a
trigger event is not found, the oscilloscope will not acquire any data.
Capturing single-shot events
Single-shot events are waveforms that occur only once or infrequently. Some
examples of single-shot events are a switch closure, a power supply turnon,
the impact of an object on the floor, or an errant pulse that causes your
system to fail.
In order to capture a single-shot event, you need to have some knowledge of
the waveform you are trying to capture. You must know the approximate
amplitude, duration, and dc offset so that you can set up the trigger level,
vertical scale and offset, and time base controls so that the oscilloscope can
capture and display the event.
If you are using a logic family, the two common trigger levels you can use to
capture an intermittent glitch are VIH minimum and VIL maximum.
2–14