Velleman MONSCA4N - Manual (Page 3)

Information sheet
Velleman ® 3/3 Last update: 25/05/2010
4. Procedure
Inspection conditions
• Viewing distance is approximately 35 ~ 40 cm (for
inspecting adjacent dots and distance between defect
dots, this distance is much closer)
• Viewing angle is normal to the LCD panel (max. 10°
deviation)
• Ambient temperature is 25 ± 5°C
• Ambient humidity is 60 ± 5% RH
• Ambient illuminance is between 300 ~ 500 Lux.
• Input signal timing should be typical value.
A eye position
B LCD panel
Inspection criteria
Refer to the definitions in §2.
N = number of defects.
defect type limit
visual
defect
scratch
0.03mm ≤ W ≤ 0.1mm
L ≤ 10mm
N ≤ 4
defect
round 0.3mm ≤ Ø ≤ 1.0mm N ≤ 5
linear
W ≤ 1.0mm
L ≤ 3.0mm
N ≤ 5
polarizer 0.3mm ≤ Ø ≤ 1.0mm N ≤ 5
total allowed N ≤ 10
electrical
defect
single dot
bright* N ≤ 6
dark N ≤ 6
total allowed N ≤ 9
adjacent dots 2** ≤ 3 pairs
3** ≤ 2 sets
4** ≤ 1 sets
distance between 2 bright dots ≥ 10mm
line defects N = 0 (not allowed!)
*: visible through a 5% ND (Neutral Density) filter
**: adjacent dots also add to the single dot counter
Note: other defects that may occur e.g. mura are subject to user interpretation and should be
evaluated individually.