MIL-DTL-15098E
TABLE III. Group B tests.
Test
Requirement paragraph
Test paragraph
Starting voltage in total darkness
3.9
4.6.3
Extinguishing voltage 1
3.11
4.6.5
Initial light output 2
3.12
4.6.6
Vibration
3.14
4.6.8
Shock
3.15
4.6.9
Life
3.16
4.6.10
1
Applicable only to circuit control lamps.
2
Applicable only to indicator lamps, when specified (see 3.1).
4.5 Test conditions.
4.5.1 Electrostatic and electromagnetic fields. The test area shall be relatively free of
electrostatic and radio frequency electromagnetic fields so as not to affect the firing potential of
the lamps.
4.5.2 Couplings and shields. Capacitive couplings and electromagnetic shields,
including portions of the body, metal plates, dark enclosures, photometer spheres and electrical
conductors, other than those connected to the lamp under test, shall be kept at least 6 inches from
the lamp being tested for starting, maintaining and extinguishing voltages.
4.5.3 Alternating current (AC) test voltage and frequency. The AC test voltage shall be
a 60 Hertz (Hz) sine wave having a harmonic content of not more than 3 percent root mean
square (rms) of the fundamental. Life test AC voltage shall be 120 ±3.6 volts AC and shall have
a maximum crest factor of 1.45.
4.5.4 Direct current (DC) test voltage. Unless otherwise specified (see 3.1), DC life test
voltage shall be 120 ±1.2 volts. DC test voltage shall be of sufficient magnitude for the lamp
under test and shall have a ripple of less than 0.1 percent, except that for life testing, the ripple
shall be less than 1.0 percent.
4.5.5 Measurement in light. Measurement in light shall be made in an unobstructed
ambient illumination of 5 to 50 lumens per square foot (lm/ft2).
4.5.6 Conditioning of lamps for measurement in dark. Lamps to be measured in total
darkness shall have been held inoperative for a period of at least 24 hours and in total darkness
(less than 0.1 lm/ft2 ambient illumination) for a minimum of 10 seconds immediately prior to
measurement.
4.5.7 Measurement in total darkness. Measurement in total darkness shall be made in a
light-tight enclosure with no internal illumination.
4.5.8 Lamp mountings. For making electrical tests, based lamps shall be mounted in
sockets which meet the inspection conditions specified herein; wire lead lamps may be
suspended by their leads. For mechanical shock and vibration tests, based lamps shall be
7
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