Tektronix WVR5200 Specification And Performance Verification Technical Reference page 47

LCD Pixel Defects
WVR5200 Waveform Rasterizer Specifications and Performance Verification
1. Set the instrument to display a white screen:
a. Press the CONFIG button.
b. Select Utilities > Screen Solid Color > Select Color > White.
c. Press the SEL button.
2. Count any pixels stuck low (not white).
3. While the screen is all white, inspect for visible defects that exceed the limits.
(See Table 44.)
NOTE.
Inspection should be done from 18˝ away from the display, under normal
room lighting. Loose dust on the front of the screen does not constitute a defect.
4. Press the SEL button to cancel the white screen.
5. Set the instrument for an all black screen:
a. Select Utilities > Screen Solid Color > Select Color > Black.
b. Press the SEL button.
6. Count any pixels stuck high (not black).
7. Press the SEL button to cancel the black screen.
8. Check that the total number of pixels counted in steps 2 and 6 is less than six.
Table 44: LCD visual defects
Defect type 1 Allowable defect
2 >0.020˝
Circular Defect
0.015˝ to 0.020˝
Black Defect >0.005˝
(opaque)
Linear Defect >0.004˝ width
(Scratches)
0.003˝ to
0.004˝wide
0.0021˝ to
0.0030˝wide
0.0010˝ to
0.0020˝wide
Stains, Allowed if they fade when backlit
discolorations,
streaks, scuffs
1
Defects should be visible from 18" under normal lighting. If you have to hold it closer or use special lighting to see
the defect, it is not a rejectable defect.
2
For irregular defects, use (LengthxWidth)/2.
Incoming Inspection
None
Maximum of two allowed within a 2I circle
None
None
Max length 0.500˝
Max length 1.000˝
Max length 1.500˝
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