MIL-DTL-24560A(SH)
withstanding voltage test of 4.4.1.6 and insulation resistance test of 4.4.1.7
if applicable.
4.4.1.3 Shock test. The light assembly shall be subjected to the type
A, class I or II, as applicable, grade A shock test for lightweight equipment
in accordance with MIL-S-901 (see 3.5.1.3). Mounting of the light assembly on
the shock machine shall simulate normal shipboard installation (see 3.1).
Light assembly shall be energized during this test. The test records shall
include photographs of the test set-up and any failed element. Following this
test, the light assemblies shall be subjected to the dielectric withstanding
voltage test of 4.4.1.6 (if applicable).
4.4.1.4 Vibration test. The light assembly shall be subjected to the
type I vibration test in accordance with MIL-STD-167-1 (see 3.5.1.4).
Mounting for the light assembly shall simulate shipboard installation (see
3.1). The light assembly shall be energized during this test. The test
records shall include copies of the vibration test reports and photographs as
outlined in MIL-STD-167-l. Following this test, the light assembly shall be
subjected to the dielectric withstanding voltage test of 4.4.1.6 (if
applicable).
4.4.1.5 Salt spray test. The light assembly shall be subjected to a
salt spray test in accordance with method 101 of MIL-STD-202, test condition A
(see 3.5.1.5).
4.4.1.6 Dielectric withstanding voltage. The light assembly shall be
subjected for l minute to a dielectric withstanding voltage test, the
effective potential of which is twice rated voltage (see 3.1), plus 1,000
volts, applied between points of polarity and also between live parts and
ground. The frequency of the test voltage shall be 60 Hertz, root mean square
alternating current, and shall approximate a true sine wave. The light
assembly shall be examined for evidence of breakdown, arcing, corona (audible
or visible) or punctured insulation (see 3.5.1.6).
4.4.1.7 Insulation resistance test. Insulation resistance test shall
be conducted between all current carrying parts and non-current carrying parts
with a megohmeter at a voltage not less than 500 volts direct current (see
3.5.1.7). This test is not required for unwired light assemblies wherein
plastic parts are certified by the manufacturer as meeting the requirements
specified (see 3.1).
4.4.1.8 Hydrostatic pressure test (type II). Type II assemblies shall
be submerged in water in a pressure tank. External hydrostatic pressures as
specified in the applicable specification sheet shall be applied for the
durations specified. Following the test, the assembly shall be examined for
conformance to 3.5.1.8.
4.4.1.9 Magnetic permeability. The relative permeability when checked
with a low-mu indicator in accordance with MIL-I-17214 shall not exceed the
permeability level specified in 3.3.3.
4.4.2
Glassware.
The following tests for glassware shall be performed.
4.4.2.1 Light output. The light output shall be measured in accordance
with the appropriate guides for photometric and colormetric testing as
specified in the IESNA Lighting Handbook (see 3.5.2.1). Before any
measurements are taken, the light assemblies shall be operated until the light
has reached a stable temperature condition. Unless otherwise specified (see
3.1), the following applicable lamp, located at the focus of the system shall
be used:
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