Agilent Technologies E4419B User Manual page 119

Power Meter Operation
Self Test
Bitmap Display (Front Panel only)
A series of bitmaps are displayed on the power meter showing: two
checkboards, vertical lines, horizontal lines, oblique lines, all pixels on and
all pixels off. Pressing cycles you through these bitmaps. The
More Prev
key stops the display and returns you to the previous menu.
Agilent E4419B User's Guide 2-79