NEC MultiSync FE700 Serviceanleitung Seite 109

2.2.3 Limits
(1) Scratch
Width(mm)
0.16 ~
0.11 ~ 0.15
0.06 ~ 0.10
~ 0.05
NOTE 1 : Even though width of scratch is more than 0.16mm, regard scratch whose
contrast is weak extremely as stain and apply standard of 3.2.
NOTE 2 : Do not recognize flaws which injures goods prices though it is not especially
stipulated as for zone C.
(2) Opaque flaws ( ex. Stain ) and coating peeling
Do not apply the following standard to zone C.
Classify flaws by contrast and judge it by size every the contrast.
Definition of a contrast
High contrast :
Middle contrast :A semitransparent foreign substance and stain
Low contrast :
Note : Ignore the light spot with no interference color.
(However, Non of them with its size in excess of 3.75 mm is acceptable, that damages
the product quality.)
Standard
Average diameter classified by a contrast
(Note 1) (mm)
High contrast Middle
contrast
~ 0.10 ~ 0.20
0.11 ~ 0.25 0.21 ~ 0.50
0.26 ~ 0.50 0.51 ~ 1.00
0.51 ~ 0.75 1.01 ~ 1.50
Values inside [ ] represent acceptable number in low contrast.
See the table in the next page for total defect number, which is acceptable in low contrast.
NOTE 1 : Convert (a+b)/2 or a/20 + 2b small value into average diameter.
(a: length, b: width)
Allowable Length(mm)(Zone A + Zone B)
The foreign substance which shuts off light from fluorescence
surface
( ex. coating material which has been changed )
stain and dust which do not reflect light from fluorescence surface
and can be distinguished by its appearance
Allowable number
Low contrast zone A
~ 0.50 Ignore
0.51 ~ 1.25
1.26 ~ 2.50
2.51 ~ 3.75
6- 8
reject
13
26
unlimited
Allowable Length
zone B
Ignore
2[4] 4[5]
1[4] 2[4]
0[4] 1[4]
(mm)
-
20
40
80