IPC-TM-650 EN 2022 试验方法1.pdf - 第295页

Figure 3 External Measurements L D W IPC-TM-650 Page 2 of 5

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IPC-T-50
IPC-TM-650
Figure 1 Box
BOW
2
1
With constraining force applied
to both corners of the same edge.
1 & 2 deflection from surface plane.
Figure 2 Twist
B
A
x
x
x
x
C
Points A, B, C
Touching Base
With constraining force
applied to one corner only.
Page 1 of 5
Figure 3 External Measurements
L
D
W
IPC-TM-650
Page 2 of 5
Note:
Note:
Figure 4 Bow Measurement
Touching Datum
Surface
HIGHEST POINT
measured as R or R
L
W
Touching Datum
Surface
IPC-TM-650
Page 3 of 5