MILPRF55110G
APPENDIX E
E.4.2.3
E.4.2.3 De-ionized water. De-ionized water comprises a portion of the borate buffer solution and shall be used to
rinse the test plated-through hole after completion of the SERA analysis. The de-ionized water shall be 1 Megohm
conductivity or better.
E.4.2.4
E.4.2.4 Isopropyl alcohol. Isopropyl alcohol is used to rinse the test plated-through hole after the completion of the
SERA analysis. Reagent grade isopropyl alcohol, in accordance with A-A-59282, shall be used.
E.4.2.5
E.4.2.5 Potassium chloride solution (KCI). The SCE reference electrode may be stored in a saturated KCI
solution. This solution uses reagent grade potassium chloride, in accordance with A-A-59282, in a saturated solution
form.
E.5
E.5. PROCEDURES
E.5.1
E.5.1 General. The test procedure shall be performed on three plated-through holes randomly chosen on the
printed wiring board or representative test coupon. The SERA test shall be performed just prior to packaging for
storage or shipment or immediately upon removal from the manufacturer's protective package. During handling, care
shall be exercised to prevent the surfaces being tested from being abraded or contaminated by grease, perspirants,
abnormal atmosphere, etc. The test procedure consists of the following operations:
Proper preparation of SERA system (see E.5.2).
a.
b.
Application of test method (see E.5.3).
c.
Evaluation of test data (see E.5.4).
d. Proper post-test preparation of SERA system (see E.5.5).
E.5.2
E.5.2 Preparation of SERA systems.
a.
Initiate inert gas flow into system and allow a minimum of 10 minutes to elapse prior to testing.
b.
Turn on digital multimeter and programmable current source and allow a minimum of 10 minutes to elapse
prior to testing.
c.
Remove reference electrode port and rinse with deionized water. Replace reference electrode port and add
sufficient quantity of borate buffer solution to immerse the SCE reference electrode a minimum of 1 inch
(25.4 mm).
d.
Remove SCE reference electrode from storage container. Rinse with deionized water, wipe with clean soft
cloth, and place into reference electrode port. Attach system electrical connections in accordance with figure
E-1.
Remove and replace test head o-ring seals as required (see E.4.1.2).
e.
f.
Close SERA test head together thus seating o-rings together on a representative sample plated-through hole
and perform vacuum check on system. No visible air bubbles shall be detected in the test head chamber
which would indicate improper sealing.
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