Agilent Technologies DSO-X 4022A, User Manual

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152 Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide
8
Display Settings
2
Press
Persistence
; then, turn the Entry knob to select between:
•
Off
— turns off persistence.
When persistence is off, you can press the
Capture Waveforms
softkey
to perform a single- shot infinite persistence. A single acquisition's
data is displayed with reduced intensity, and it remains on the
display until you clear persistence or clear the display.
•
∞
Persistence
— (infinite persistence) Results of previous acquisitions
are never erased.
Use infinite persistence to measure noise and jitter, to see the
worst- case extremes of varying waveforms, to look for timing
violations, or to capture events that occur infrequently.
• Variable Persistence — Results of previous acquisitions are erased after
a certain amount of time.
Variable persistence gives you a view of acquired data that is similar
to analog oscilloscopes.
When variable persistence is selected, press the Time softkey and use
the Entry knob to specify the amount of time that previous
acquisitions are to be displayed.
The display will begin accumulating multiple acquisitions.
3 To erase the results of previous acquisitions from the display, press the
Clear Persistence
softkey.
The oscilloscope will start to accumulate acquisitions again.
4 To return the oscilloscope to the normal display mode, turn off
persistence; then, press the
Clear Persistence softkey.
Turning off persistence does not clear the display. The display is
cleared if you press the
Clear Display softkey or if you press the
[AutoScale] key (which also turns off persistence).
For another method of seeing worst- case extremes of varying waveforms,
see
"Glitch or Narrow Pulse Capture" on page 221.