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|  MIL-T-48604(MU)
4.5.2.1 Data collection. - Data will consist of all malfunctions,
number of hours completed when malfunction occurred, nature and cause
of malfunction, time required to correct malfunction, corrective action
required, item serial number and environmental exposure.
4.5.2.2 Failure definition. - A failure is defined as any malfunction
which results in an inoperative tube or a tube which is operative outside
the limits of this specification. In determination of chargeable reli-
ability failures, the following clarification shall apply.
4.5.2.3 Assignable cause. - If upon failure analysis (to determine
the cause of malfunction) an-assignable cause (related to manufacturing
process, procedure, etc.) is determined as the basis of the malfunction,
the malfunction will not be chargeable as a reliability failure; however,
the correction to the manufacturing process or procedure (et al) shall
be accomplished.
4.5.2.4 Unassignable cause. - If upon failure analysis no assignable
cause is evident and the malfunction is considered random in nature, the
malfunction shall be chargeable reliability failure and as such must be
considered in the above demonstration. The dexisions as to chargeable
reliability failure must be coordinated with the procuring activity,
Frankford Arsenal Reliability & Maintainability Engineering Branch (SARFA-
QAF-R).
4.5.3 Pre-encapsulation.
4.5.3.1 Leakage. - To determine compliance with 3.4.1, the tube shall
be held in a suitable container and immersed completely in water (H20) so
that both ends of the tubes are at approximately the same depth. The
water shall then be heated by any suitable means to being the water to a
boil (approximately 212F). The water shall be boiled-for four hours at
which time the tubes shall be removed and allowed to dry and cool. The
tubes shall be visually inspected for damage. Subsequently the tube shall
be subjected to the tests of 4.5.3.2.
4.5.3.2 Burn-in (unencapsulated). -To determine compliance with 3.4.2,
utilize a power supply simulating the Power Supply Module, F11739861 with
Ballast Resistor (see 3.1.7) connected in series with the tube. Operate
the laser tube through 24 cycles of 50 minutes on and 10 minutes off. Sub-
sequently the tube shall be subjected to the tests of 4.7.1 through 4.7.5
inclusive to determine compliance with the requirements of 3.7.1 through
3.7.5.
4.5.4 Post encapsulation tests.
4.5.4.1 Sealing. - A test fixture containing an adapter type box to
encapsulate and pressurize the entire tube area extending from the flanged
portion of the clamping area (see Figure 2) to the output end shall be
provided to determine compliance with 3.5.1. With the tube assembly se-
cured in the pressure fixture containing a pressure gage accurate to
within 10% of leakage rate of 0.2 psig per two hours, the box shall pres-
surized at 5 psig for a period of two hours to determine compliance
with 3.5.1.
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