IPC9850_Surface Mount Equipment Characterization.pdf - 第49页

IPC-9850 Official Proposal May 2001 49 SOIC16 Measure left, right and bottom of lead. Construct intersection points. Construct midpoint (*). Draw fines through northern and southern midpoints. x ,y. Average of all leads …

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IPC-9850
Official Proposal
May 2001
48
D-4.1 Simulation
The variation on the intersection points of the leads comes from two error causes:
1. The measurement error, distribution assumed with stdev of 0.0005
2. The component variation, distribution assumed with stdev of 0.0017 in x and 0.0127 in y
With these estimates of the intersection points the lead location is calculated. And with those leads, the center- and
angle location of the component is estimated, using 4,8,12 or 16 leads.
In this way ten thousand measurements are simulated. In the table below are given the estimates of the center- and
angle location of the component using 4,8,12 or 16 leads.
Mean StdevNr. of leads
used x y theta x y theta
4 0.000 0.000 0.000 0.0014 0.0081 1.0325
8 0.000 0.000 0.005 0.0010 0.0057 0.8420
12 0.000 0.000 0.000 0.0008 0.0047 0.8028
16 0.000 0.000 0.001 0.0007 0.0040 0.7989
Table D-3: Mean and stdev vs. nr. of measured leads (nominal means are: x=0, y=0, theta=0)
D-4.2 Conclusion
From the results above, can be concluded that using all 16 leads, gives the best estimate of the center- and angle
location of the component.
D-5 Recommendations
The results in this report show that the way the center- and angle location of a component are measured influences
the accuracy. Therefore it is recommended to include general directions for measuring the components which are
used in the IPC-9850 standard.
In the figures below, the measurement recommendations given in this Appendix are summarized.
Glass QFP-100, QFP-208 and BGA-228
Measure the fiducials (1,2,3,4)
Construct intersection points (A,B,C,D)
x,y: Average of x resp. y of the fiducials (1,2,3,4)
theta: Average angle of lines AC and BD
1608C
Measure sides of component (thick lines)
Construct intersection points (1,2,3,4)
Calculate midpoints (A,B,C,D)
x,y: Average of x resp. y of the fiducials (1,2,3,4)
theta: Average angle of lines AC and BD
2
A
3
4
C
D B
1
2A
3
4 C
D B
1
IPC-9850
Official Proposal
May 2001
49
SOIC16
Measure left, right and bottom of lead.
Construct intersection points.
Construct midpoint (*).
Draw fines through northern and
southern midpoints.
x,y. Average of all leads
Method 1
The theta of the component is
1, Average the location for both X
T
and
Y
T
on the top side leads of the component
2, Average the location for both X
B
and
Y
B
on the bottom side leads of the
component
3. Use the points (X
T
,Y
T
) and (X
B
,Y
B
) to determine a line
4, Then measure the angle of this line minus 90 degrees to determine the angle of the component.
Method 2
theta: Average of angles of northern and southern line.
T
B
IPC-9850
Official Proposal
May 2001
50
Appendix E
Component Locations for Panel Population
IPC 9850 1608C CHIP GRID LAYOUT
X
1
5
X
2
7.5
X
3
10.7
5
X
4
14.75
X
5
19.5
X
6
25
X
7
31.25
X
8
38.25
X
9
46
X
10
54.5
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
Y
1
5 5 5 0 7.5 5 90 10.75 5 180 14.75 5 270 19.5 5 0 25 5 90 31.25 5 180 38.25 5 270 46 5 0 54.5 5 90
Y
2
7.5 5 7.5 0 7.5 7.5 90 10.75 7.5 180 14.75 7.5 270 19.5 7.5 0 25 7.5 90 31.25 7.5 180 38.25 7.5 270 46 7.5 0 54.5 7.5 90
Y
3
10.75 5 10.75 0 7.5 10.75 90 10.75 10.75 180 14.75 10.75 270 19.5 10.75 0 25 10.75 90 31.25 10.75 180 38.25 10.75 270 46 10.75 0 54.5 10.75 90
Y
4
14.75 5 14.75 0 7.5 14.75 90 10.75 14.75 180 14.75 14.75 270 19.5 14.75 0 25 14.75 90 31.25 14.75 180 38.25 14.75 270 46 14.75 0 54.5 14.75 90
Y
5
19.5 5 19.5 0 7.5 19.5 90 10.75 19.5 180 14.75 19.5 270 19.5 19.5 0 25 19.5 90 31.25 19.5 180 38.25 19.5 270 46 19.5 0 54.5 19.5 90
Y
6
25 5 25 0 7.5 25 90 10.75 25 180 14.75 25 270 19.5 25 0 25 25 90 31.25 25 180 38.25 25 270 46 25 0 54.5 25 90
Y
7
31.25 5 31.25 0 7.5 31.25 90 10.75 31.25 180 14.75 31.25 270 19.5 31.25 0 25 31.25 90 31.25 31.25 180 38.25 31.25 270 46 31.25 0 54.5 31.25 90
Y
8
38.25 5 38.25 0 7.5 38.25 90 10.75 38.25 180 14.75 38.25 270 19.5 38.25 0 25 38.25 90 31.25 38.25 180 38.25 38.25 270 46 38.25 0 54.5 38.25 90
Y
9
46 5 46 0 7.5 46 90 10.75 46 180 14.75 46 270 19.5 46 0 25 46 90 31.25 46 180 38.25 46 270 46 46 0 54.5 46 90
Y
10
54.5 5 54.5 0 7.5 54.5 90 10.75 54.5 180 14.75 54.5 270 19.5 54.5 0 25 54.5 90 31.25 54.5 180 38.25 54.5 270 46 54.5 0 54.5 54.5 90
Y
11
63.75 5 63.75 0 7.5 63.75 90 10.75 63.75 180 14.75 63.75 270 19.5 63.75 0 25 63.75 90 31.25 63.75 180 38.25 63.75 270 46 63.75 0 54.5 63.75 90
Y
12
73.75 5 73.75 0 7.5 73.75 90 10.75 73.75 180 14.75 73.75 270 19.5 73.75 0 25 73.75 90 31.25 73.75 180 38.25 73.75 270 46 73.75 0 54.5 73.75 90
Y
13
84.5 5 84.5 0 7.5 84.5 90 10.75 84.5 180 14.75 84.5 270 19.5 84.5 0 25 84.5 90 31.25 84.5 180 38.25 84.5 270 46 84.5 0 54.5 84.5 90
Y
14
96 5 96 0 7.5 96 90 10.75 96 180 14.75 96 270 19.5 96 0 25 96 90 31.25 96 180 38.25 96 270 46 96 0 54.5 96 90
Y
15
108.25 5 108.25 0 7.5 108.25 90 10.75 108.25 180 14.75 108.25 270 19.5 108.25 0 25 108.25 90 31.25 108.25 180 38.25 108.25 270 46 108.25 0 54.5 108.25 90
Y
16
121.25 5 121.25 0 7.5 121.25 90 10.75 121.25 180 14.75 121.25 270 19.5 121.25 0 25 121.25 90 31.25 121.25 180 38.25 121.25 270 46 121.25 0 54.5 121.25 90
Y
17
135 5 135 0 7.5 135 90 10.75 135 180 14.75 135 270 19.5 135 0 25 135 90 31.25 135 180 38.25 135 270 46 135 0 54.5 135 90
Y
18
149.5 5 149.5 0 7.5 149.5 90 10.75 149.5 180 14.75 149.5 270 19.5 149.5 0 25 149.5 90 31.25 149.5 180 38.25 149.5 270 46 149.5 0 54.5 149.5 90
Y
19
164.75 5 164.75 0 7.5 164.75 90 10.75 164.75 180 14.75 164.75 270 19.5 164.75 0 25 164.75 90 31.25 164.75 180 38.25 164.75 270 46 164.75 0 54.5 164.75 90
Y
20
180.75 5 180.75 0 7.5 180.75 90 10.75 180.75 180 14.75 180.75 270 19.5 180.75 0 25 180.75 90 31.25 180.75 180 38.25 180.75 270 46 180.75 0 54.5 180.75 90
X
11
63.75
X
12
73.75
X
13
84.5
X
14
96
X
15
108.25
X
16
121.25
X
17
135
X
18
149.5
X
19
164.75
X
20
180.75
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
X Y
θ
Y
1
5 63.75 5 180 73.75 5 270 84.5 5 0 96 5 90 108.25 5 180 121.25 5 270 135 5 0 149.5 5 90 164.75 5 180 180.75 5 270
Y
2
7.5 63.75 7.5 180 73.75 7.5 270 84.5 7.5 0 96 7.5 90 108.25 7.5 180 121.25 7.5 270 135 7.5 0 149.5 7.5 90 164.75 7.5 180 180.75 7.5 270
Y
3
10.75 63.75 10.75 180 73.75 10.75 270 84.5 10.75 0 96 10.75 90 108.25 10.75 180 121.25 10.75 270 135 10.75 0 149.5 10.75 90 164.75 10.75 180 180.75 10.75 270
Y
4
14.75 63.75 14.75 180 73.75 14.75 270 84.5 14.75 0 96 14.75 90 108.25 14.75 180 121.25 14.75 270 135 14.75 0 149.5 14.75 90 164.75 14.75 180 180.75 14.75 270
Y
5
19.5 63.75 19.5 180 73.75 19.5 270 84.5 19.5 0 96 19.5 90 108.25 19.5 180 121.25 19.5 270 135 19.5 0 149.5 19.5 90 164.75 19.5 180 180.75 19.5 270
Y
6
25 63.75 25 180 73.75 25 270 84.5 25 0 96 25 90 108.25 25 180 121.25 25 270 135 25 0 149.5 25 90 164.75 25 180 180.75 25 270
Y
7
31.25 63.75 31.25 180 73.75 31.25 270 84.5 31.25 0 96 31.25 90 108.25 31.25 180 121.25 31.25 270 135 31.25 0 149.5 31.25 90 164.75 31.25 180 180.75 31.25 270
Y
8
38.25 63.75 38.25 180 73.75 38.25 270 84.5 38.25 0 96 38.25 90 108.25 38.25 180 121.25 38.25 270 135 38.25 0 149.5 38.25 90 164.75 38.25 180 180.75 38.25 270
Y
9
46 63.75 46 180 73.75 46 270 84.5 46 0 96 46 90 108.25 46 180 121.25 46 270 135 46 0 149.5 46 90 164.75 46 180 180.75 46 270
Y
10
54.5 63.75 54.5 180 73.75 54.5 270 84.5 54.5 0 96 54.5 90 108.25 54.5 180 121.25 54.5 270 135 54.5 0 149.5 54.5 90 164.75 54.5 180 180.75 54.5 270
Y
11
63.75 63.75 63.75 180 73.75 63.75 270 84.5 63.75 0 96 63.75 90 108.25 63.75 180 121.25 63.75 270 135 63.75 0 149.5 63.75 90 164.75 63.75 180 180.75 63.75 270
Y
12
73.75 63.75 73.75 180 73.75 73.75 270 84.5 73.75 0 96 73.75 90 108.25 73.75 180 121.25 73.75 270 135 73.75 0 149.5 73.75 90 164.75 73.75 180 180.75 73.75 270
Y
13
84.5 63.75 84.5 180 73.75 84.5 270 84.5 84.5 0 96 84.5 90 108.25 84.5 180 121.25 84.5 270 135 84.5 0 149.5 84.5 90 164.75 84.5 180 180.75 84.5 270
Y
14
96 63.75 96 180 73.75 96 270 84.5 96 0 96 96 90 108.25 96 180 121.25 96 270 135 96 0 149.5 96 90 164.75 96 180 180.75 96 270
Y
15
108.25 63.75 108.25 180 73.75 108.25 270 84.5 108.25 0 96 108.25 90 108.25 108.25 180 121.25 108.25 270 135 108.25 0 149.5 108.25 90 164.75 108.25 180 180.75 108.25 270
Y
16
121.25 63.75 121.25 180 73.75 121.25 270 84.5 121.25 0 96 121.25 90 108.25 121.25 180 121.25 121.25 270 135 121.25 0 149.5 121.25 90 164.75 121.25 180 180.75 121.25 270
Y
17
135 63.75 135 180 73.75 135 270 84.5 135 0 96 135 90 108.25 135 180 121.25 135 270 135 135 0 149.5 135 90 164.75 135 180 180.75 135 270
Y
18
149.5 63.75 149.5 180 73.75 149.5 270 84.5 149.5 0 96 149.5 90 108.25 149.5 180 121.25 149.5 270 135 149.5 0 149.5 149.5 90 164.75 149.5 180 180.75 149.5 270
Y
19
164.75 63.75 164.75 180 73.75 164.75 270 84.5 164.75 0 96 164.75 90 108.25 164.75 180 121.25 164.75 270 135 164.75 0 149.5 164.75 90 164.75 164.75 180 180.75 164.75 270
Y
20
180.75 63.75 180.75 180 73.75 180.75 270 84.5 180.75 0 96 180.75 90 108.25 180.75 180 121.25 180.75 270 135 180.75 0 149.5 180.75 90 164.75 180.75 180 180.75 180.75 270