MILPRF55110G
APPENDIX E
E.4.1.3
E.4.1.3 Vacuum pump (see detail C). A vacuum pump shall be used to draw buffer solution into and out of the test
head compartment. The vacuum pump shall be able to draw minimum vacuum of 5 inches of Hg (16.9 kPa).
E.4.1.4
E.4.1.4 Gas regulator (see detail D). An in-line gas regulator shall be used to monitor the flow of the inert purging
gas. The gas regulator shall be able to measure a minimum of 1 cubic foot per hour (0.02832 cubic meters per hour)
at standard temperature and pressure.
E.4.1.5
E.4.1.5 SCE reference electrode (see detail E). The reference electrode shall be a SCE reference electrode with a
temperature range of 5 degrees Celsius to +60 degrees Celsius and a Ph range of 014. The SCE reference
electrode shall be stored in such a manner as to prevent drying out (either in a saturated KCI solution or in
accordance with the manufacturer's instructions). The SCE reference electrode shall be calibrated in accordance with
the manufacturer's instructions once every 30 days.
E.4.1.6
E.4.1.6 Computer (see detail F). The computer shall be equivalent to or better than a MS-DOS compatible, 80286-
12 MHz, with 512 Kbyte of internal memory and floppy and hard disk drives.
E.4.1.7
E.4.1.7 IEEE-488 interface card (see detail G). An IEEE-488 interface card is required for data acquisition
between the computer, the digital multimeter, and the programmable current source.
E.4.1.8
E.4.1.8 Digital multimeter (see detail H). A digital multimeter is required to measure the voltage changes during
the SERA reduction. The digital multimeter shall have the following characteristics:
a.
A measurable voltage range of 0 V to 2.0 V.
b.
A voltage measurement tolerance of ±5 mV.
c.
Voltage measurement RMS noise level should not exceed 10 Mv.
d. Input impedance should be greater than 1 G-ohm.
E.4.1.9
E.4.1.9 Programmable current source (see detail I). A programmable current source is required to apply a
constant current during the SERA reduction. The programmable current source shall have the following minimum
characteristics:
a.
The applied current should be variable in 0.1 microamp steps between 1.0 microamps and 10 microamps.
b. The applied current should remain constant within ±5 percent.
E.4.1.10
E.4.1.10 Printed wiring board (PWB) contact pin (see detail J). A contact pin is required to complete the electrical
circuit with the test plated-through hole. The contact pin shall not exert a force of greater than .5 pounds (0.23 Kg)
nor alter the plated-through hole form, fit, or function.
E.4.2
E.4.2 Materials.
E.4.2.1
E.4.2.1 Borate buffer solution. The SERA test requires the use of a borate buffer solution. This solution uses
reagent grade boric acid, sodium borate (Na2B407 * 10 H20), and de-ionized water. The recipe is 6.18 grams/liter
boric acid and 9.55 grams/liter of sodium borate. The Ph of the borate buffer solution shall be in the range of 8.3 to
8.4. Adjustments to the buffer Ph shall be made using either boric acid or sodium borate additions.
E.4.2.2
E.4.2.2 Inert gas. An inert gas is required to purge oxygen from the system. Either argon or ultra high purity
(99.998 percent) dry nitrogen shall be used.
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