Operator
’s Guide
Appendix D
003-4500
RJS, Minneapolis, MN
75
Table D-3 (Defects percentage ranges to Numeric and
Letter Grades)
Min
Max
Numeric
Letter
0
15.00
4.0
A
15.01
15.50
3.9
A
15.51
16.00
3.8
A
16.01
16.50
3.7
A
16.51
17.00
3.6
A
17.01
17.50
3.5
A
17.51
18.00
3.4
B
18.01
18.50
3.3
B
18.51
19.00
3.2
B
19.01
19.50
3.1
B
19.51
20.00
3.0
B
20.01
20.50
2.9
B
20.51
21.00
2.8
B
21.01
21.50
2.7
B
21.51
22.00
2.6
B
22.01
22.50
2.5
B
22.51
23.00
2.4
C
23.01
23.50
2.3
C
23.51
24.00
2.2
C
24.01
24.50
2.1
C
24.51
25.00
2.0
C
25.01
25.50
1.9
C
25.51
26.00
1.8
C
26.01
26.50
1.7
C
26.51
27.00
1.6
C
27.01
27.50
1.5
C
27.51
27.99
1.4
D
28.00
28.49
1.3
D
28.50
28.99
1.2
D
29.00
29.49
1.1
D
29.50
30.00
1.0
D
30.01
100.00
0.0
F
ISO/IEC 15416:2016(E) established that the Defects
grade shall be 0.0 for all values greater than 30%.