Keysight N1911A

Maintenance 10
Keysight N1911A/1912A User’s Guide 265
Display
Three tests are available for the display: the display assembly, display RAM and
bitmap display.
A read/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 tested are the LCD contrast control,
the LED brightness control, and the display temperature sensing diode.