Agilent Technologies E4418B User Manual page 124

2 Power Meter Operation
A read or write is performed on the display RAM. If the value which is
written is read back correctly, a pass is recorded, otherwise a fail is
recorded.
The liquid crystal display/ light emitting diode (LCD/LED) control circuits
are tested by making separate voltage measurements via the multiplexer
and digital signal processor. If the expected voltages are measured, a pass
is recorded, otherwise a fail is recorded. The three circuits which are
tested are the LCD contrast control, the LED brightness control and the
display temperature sensing diode.
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
100
key stops the display and returns you to the previous menu.
cycles you through these bitmaps. The
E4418B Power Meter User's Guide