HP 54710A User's Reference Manual page 380

Mask Menu
Fail Action
Store screen
Store screen determines what the oscilloscope does to the data on the screen
on a failure. The screen data is a pixel dump of the entire screen area. The
choices are off, pixel memory, printer, disk. The screen image allows you to
see what the display looked like at the time of the failure , but you cannot
rescale it later like you can with waveform memories or functions. If the help
menu is displayed on the screen at the time of the failure, then the help menu
is the screen image that is stored.
Off Off means that the an image copy of the entire screen area is not
stored, printed, or retained.
Pixel memory Pixel memory stores an image copy of the entire screen
area to the pixel memory (The same pixel memory that is accessed by
the Waveform menu.). Additional failures are added to the composite
data stored in the pixel memory. The only way to clear the pixel memory
is from the Waveform menu.
The value of the pixel memory selection is that you can save the waveform
area from multiple failures to the pixel memory and have a composite view of
the failures.
See also Chapter 20, "Waveform menu," for additional information on the pixel
memory.
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