158 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
9 Display Settings
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 [Auto Scale] 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 223.
To clear the display
1 Press [Clear Display] (or press [Display] > Clear Display).
You can also configure the [Quick Action] key to clear the display. See “Configuring
the [Quick Action] Key" on page 357.
To select the grid type
When the Video trigger type is selected (see “Video Trigger" on page 191), and the
vertical scaling of at least one displayed channel is 140 mV/div, the Grid softkey
lets you select from these grid types:
• Full — the normal oscilloscope grid.
• mV — shows vertical grids, labeled on the left, from -0.3 V to 0.8 V.
• IRE — (Institute of Radio Engineers) shows vertical grids in IRE units, labeled on
the left, from -40 to 100 IRE. The 0.35 V and 0.7 V levels from the mV grid are
also shown and labeled at the right. When the IRE grid is selected, cursor values
are also shown in IRE units. (Cursor values via the remote interface are not in
IRE units.)
The mV and IRE grid values are accurate (and match Y cursor values) when the
vertical scaling is 140 mV/division and the vertical offset is 245 mV.
To select the grid type:
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