HP 54540 Series - Page 30

Front-Panel Overview
Control
Clear Display Key
The Clear Display key erases all waveform data from the graticule area, clears
waveform math functions, and it resets all associated measurements and
measurement statistics. Pressing the Clear Display key does not affect the
waveform memories.
When the oscilloscope is stopped [If the oscilloscope is stopped, the
display remains cleared of waveform data until the trigger circuit is
rearmed and the oscilloscope is triggered. Then, the new data is
displayed and measurements are recalculated.
When the oscilloscope is running If the oscilloscope is running, new
waveform data is displayed on the next acquisition and all measurements
are recalculated.
Stop/Single Key
Pressing the Stop/Single key causes the oscilloscope to stop acquiring data.
The status area of the screen displays the message "Stopped." In the
auto-trigger mode, the next press of the Stop/Single key arms the trigger
circuit. If no trigger occurs, the scope triggers itself. In the triggered mode,
the next press of the Stop/Single key arms the trigger circuit. Ifa trigger
event is not immediately present, the Armed light on the front-panel lights
and the message "running-awaiting trigger" is displayed. If the trigger event
is immediately present, you may not see the arm light turn on or the message
"running-awaiting trigger." The next trigger event causes the oscilloscope to
make a single acquisition, the trig’d (triggered) light briefly lights, the
message "stopped" is displayed, and any measurements are recalculated.
Each subsequent press of the Stop/Single key rearms the trigger circuit. If all
of the channels are turned off or if a trigger event can not be found, the
oscilloscope will not acquire any data.
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