Page 11 - Six Sigma for electronics design and manufacturing

Contents
x
123
4.4.2
PCB test strategy example
4.4.3
In-circuit test effectiveness
127
4.4.4
Factors affecting test operation parameters
128
4.4.5
128
Test coverage
Bad and good test effectiveness
129
4.4.6
130
4.4.7
Future trends in testing
130
Conclusions
4.5
References and Bibliography
131
4.6 4.4.1 PCB test strategy 121
Chapter 5. The Use of Six Sigma With High- and 133
Low-Volume Products and Processes
5.1 Process Average and Standard Deviation 134
Calculations for Samples and Populations
5.1.1 Examples of the use of the t-distribution for 137
sample and population averages
5.1.2 Other statistical tools: Point and interval 138
estimation
5.1.3 Examples of point estimation of the average 139
5.1.4 Confidence interval estimation for the average 140
5.1.5 Standard deviation for samples and 142
populations
5.1.6 Examples of population variance 144
determination
5.2 Determining Process Capability 145
5.2.1 Process capability for large-volume 146
production
5.2.2 Determination of standard deviation for 148
process capability
5.2.3 Example of methods of calculating 149
5.2.4 Process capability for low-volume production 150
5.2.5 Moving range (MR) methodologies for low 150
volume: MR control charts
5.2.6 Process capability studies in industry 152
5.3 Determining Gauge Capability 154
5.3.1 GR&R methodology 156
5.3.2 Examples of GR&R calculations 158
5.3.3 GR&R results interpretation 159
5.3.4 GR&R examples 160
5.4 Determining Short- and Long-Term Process 164
Capability