To Check The Flat Panel Display (Fpd) - Agilent Technologies 54835A Service Manual

To check the flat panel display (FPD)

No equipment is required for this procedure. Specifications for flat-panel displays used in the
Infiniium oscilloscope are shown in the following table.
Flat-Panel Display Specifications
Defect Type
Polarizer
Dot Defect
(A dot is defined as 1, 2, or 3 stuck
subpixels touching horizontally.
Subpixels are horizontal red, green,
blue triads, so these may show up as
one of 8 colors or black.)
Line Defect
Non-uniformity
Luminance
(The measurement is perpendicular
to the screen surface in both axes.)
When to Use this Procedure
This procedure should not be performed as a part of routine maintenance. Perform the procedure only
when there appears to be a problem with the display.
Enable the graphical interface.
1
Select Self Test from the Utilities menu.
2
Click the Service Extensions box in the Self Test dialog.
3
Select Screen from the Test drop-down list box.
4
See figure 4-2.
Scratch
Dent
Bright dot
Dark dot
Total dot
Two adjacent dots
Bright dot
Dark dot
Three or more adjacent dots
Distance between defects
Bright dot
Dark dot
Minimum
Typical
Chapter 4: Calibrating and Adjusting

To check the flat panel display (FPD)

Limit
Width ≤ 0.05 mm
Length ≤ 10 mm
φ ≤ 0.4mm
N ≤ 5
N ≤ 7
N ≤ 12
≤ 2 pairs
≤ 2 pairs
Not allowed
≥ 10 mm
≥ 10 mm
Not allowed
Check other specifications
2
160 cd/m
2
200 cd/m
4–7