HP 54501A Operation Reference page 60

Trigger Menu
6-6
The HP 5450lA sets up the display parameters. It
trigger on the first rising edge of the two cycle burst.
•
Enter the Trigger Menu and press the
is
The oscilloscope now triggering on the f rrst falli n g edge of the two cycle
slope
burst. Press the
The signal generator is set for two 500 ns pulses. The display on
the oscilloscope appears to have three pulses. This
unstable trigger condition The following steps explain this
condition and how to overcome it
holdolf
•
Press the key.
Set holdoff to 1.02000 IJ.S, using either of the entry devices.
•
Holdoff on the HP 5450lA has a minimum setting of 40
signal to the oscilloscope has two 500
occur
s and activates the 40 ns holdoff. When the holdoff time has
trigger
elapsed the oscilloscope trigge r s on the next rising edge. The oscill o scope
times a 40 holdoff and looks for another trigger. The oscilloscope will
os
trigger on the first rising edge of the second burst.
occurs on a different pulse, and consequently an unstable condition.
slope
key again to trigger on the positive edge.
Note
os
pulses. On the first rising edge a
is now attempting to
key.
an
is
os.
Th."input
Each trigg e r event