IPC9850_Surface Mount Equipment Characterization.pdf - 第55页
IPC-9850 Official Proposal May 2001 55 Appendix I - Placement Verification Panel Carrier A photograph of a suggested suitcase for the Placement Verification Panel carrier. The suitcase is the packaging for the set of 4 s…
IPC-9850
Official Proposal
May 2001
54
Appendix H- Instruction for Using the Gauge R&R Spreadsheet
G-9 Calculation Method: Average and Range Method
G-10 Definitions
X
A
-Bar = Average of all the points measured by operator A
R
A
-Bar = The average of ranges measured by operator A
X
B
-Bar = Average of all the points measured by operator B
R
B
-Bar = The average of ranges measured by operator B
R-DblBar = The average of the ranges from operator A and B
R
DIF
= This is the range between the averages for operators A and B
d
2
= 1.693
G-11 Formulas (As seen in the spreadsheet above)
G-11.2 Range of Means
R
DIF
= ABS{(X
A
-Bar)-(X
B
-Bar)}
G-11.3 Repeatability Error
RPT = (R-DblBar)*(6.0/d2)
G-11.4 Reproducibility Error
RPD = (R
DIF
)*(6.0/d2)
G-11.5 Total Error
R&R Error = SQRT(RPT
2
+PRD
2
)
Gage R&R =100*[(R&R Error)/(USL-LSL)]
(Must be less then 10% for gage to be valid)
Lowest Specification Limits possible with current gage error.
+/-Specification Limits = ABS{(1/2)*(10)*R&R Error}
IPC-9850
Official Proposal
May 2001
55
Appendix I - Placement Verification Panel Carrier
A photograph of a suggested suitcase for the Placement Verification Panel carrier. The suitcase is the packaging for
the set of 4 separate carriers. See ‘CarrierDocuments.zip’ for design details of the carrier.
IPC-9850
Official Proposal
May 2001
56
Appendix J- Instruction for Using The ‘Termination-to-Land Calculations.xls’
spreadsheets
The workbook contains a spreadsheet for each of the 5 component types. In each worksheet, instructions are
included that explain where to place the x, y, and theta errors that were established by the CMM for all components
on the 4 boards. A workbook with termination-to-land calculation spreadsheets for each of the five component types
may be downloaded from the IPC web site. (Document reviewers contact Jack Crawford at IPC for this file.)
The spreadsheet automatically calculates the summary information that needs to be put into the Performance
Reporting Form when it is being used to verify specification compliance.
As an example, here is what the QFP100 spreadsheet looks like:
The equations used are identical to those presented in the body of this standard.