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MIL-PRF-55110 Printed Wiring Board, Rigid, General Specification ForThis specification establishes the performance and qualification requirements for rigid single??sided, double??sided, and multilayered printed wiring boards with or without plated through holes \(see 6.1\). Verification is accomplished through the use of one of two methods of product assurance \(QPL or QPL/QML\). Detail requirements, specific characteristics, and other provisions which are sensitive to the particular intended use are specified in the applicable master drawing.

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MIL­PRF­55110G
APPENDIX E
An example of the calculation is as follows:
H
= See table E­I for the values for H.
R1
= Plated-through hole radius = .018 inches nominal (0.046 cm).
R2
= O-ring internal radius = 0.075 cm.
Area = (2)(š)(0.046)(H) + [(2)(š)(0.075)2 ­ (2)(š)(0.046)2]
= (0.22890)(H)
+ [0.03534 ­ 0.013295]
= 0.2890 cm (H cm) + [0.022045 cm2]
table E-I TABLE E­I
TABLE E­I. SERA plated-through hole example calculation data.
Printed wiring board thickness
H
Area
(centimeters2)
(inches)
(centimeters)
0.0367
0.0508
.020
0.0441
0.0762
.030
0.0514
0.1016
.040
0.0587
0.1270
.050
0.0661
0.1524
.060
0.0734
0.1778
.070
0.0808
0.2032
.080
0.0881
0.2286
.090
0.0955
0.2540
.100
0.1028
0.2794
.110
E.5.4
E.5.4 Evaluation of test data. The change in reduction voltage shall be plotted versus the charge density (current
density x time). This SERA curve generated shall be differentiated and then incorporate the following moving window
average, curve smoothing function:
V(n) = SUM [V(n­5) through V(n+5)] / 11
The following eight SERA parameters shall be calculated from the differentiated and smoothed SERA curve using the
following threshold limits listed below. Figure E­2 illustrates these parameters and threshold limits on an example
SERA curve.
1.
Voc = The final open circuit voltage measured for the SERA differentiated/smoothed curve.
2.
Q1 = The area under the curve defined by: Nmin1 threshold value (defined constant value).
3.
V2 = The voltage on the differentiated/smoothed curve defined by: (Nmin3 + Nmin1 threshold values) / 2.
4.
Q2 = The area under the curve defined by: Nmin3 threshold value ­ Nmin 1 threshold value.
5.
V3 = The voltage on the differentiated/smoothed curve defined by: (Nmin5 + Nmin3 threshold value)/2.
6.
Q3 = The area under the curve defined by: Nmin5 threshold value ­ Nmin3 threshold value.
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