MIL-DTL-15098E
mounted by their normal mounting means; wire lead lamps shall be secured to the test fixture so
as to prevent relative movement between lamp and fixture at the point of attachment.
4.6 Examination and tests.
4.6.1 Visual and dimensional examination. Lamps shall be visually and dimensionally
examined to verify that the physical characteristics, dimensions, marking and workmanship are
in accordance with the applicable requirements specified herein (see 3.4 through 3.7, 3.18,
and 3.19).
4.6.2 Solderability. Wire lead lamps shall be tested in accordance with method 208 of
MIL-STD-202 to determine conformance with the requirements specified in 3.8.
4.6.3 Starting voltage (see 3.9). The lamps shall be wired as shown on figure 1. For
lamps with external resistors, R1 shall be increased while continuously observing V2 for the
highest voltage reached just before the voltmeter indication decreases abruptly. For lamps with
resistors in their bases, R1 shall be increased while continuously observing V1 for the highest
voltage reached just before the ammeter indication increases abruptly and the lamp glows. The
highest voltage reached is the starting voltage. The lamps shall be tested in light and in total
darkness (see 4.5.5 through 4.5.7).
4.6.4 Maintaining voltage (see 3.10). The lamps shall be wired as shown on figure 1.
With the lamp operated at the specified test current (see 3.1), the maintaining voltage shall be the
voltage indicated on V1. This test is not applicable to lamps having resistors in their bases.
4.6.5 Extinguishing voltage (see 3.11). The lamps shall be wired as shown on figure 1.
R1 shall be decreased while continuously observing V2 for the lowest voltage reached just before
the voltmeter indication increases abruptly. The lowest voltage reached is the extinguishing
voltage. This test is not applicable to lamps having resistors in their bases.
4.6.6 Initial light output (see 3.12). Initial light output test shall be conducted as
follows:
a. Mount the test and calibration lamps into the integrating (Ulbricht) sphere as
indicated on figure 2 so that the baffle prevents direct illumination of the diffusing glass by
either lamp.
b. Energize the photomultiplier and allow approximately 15 minutes for warm-up and
stabilization (see figure 3.) A solid-state photometer of similar performance characteristics may
be substituted for the photomultiplier and voltmeter in steps (d) through (h) below.
c. Apply voltage to the calibration lamp as required for its calibrated light output
(see figure 4).
d. Adjust the photomultiplier output to correspond with the known output of the
calibration lamp. This adjustment is made by varying resistor R1 on figure 3.
e. Without further adjustment of the photomultiplier, read the outputs of two additional
calibration lamps, then adjust the photomultiplier output to the average of the three lamps.
f. De-energize the calibration lamp.
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