MIL-DTL-83522E
test (from a baseline obtained before each test) per TIA-455-20 for transmitted power. The periodicity of the measurement shall be
appropriate for the test method (see applicable measurement in MIL-STD-1678-3) and as approved by the qualifying activity. Setup
and test procedure shall conform to 4.7.5. The use of a reference fiber (as defined in MIL-STD-1678-1) to evaluate the change in
optical transmittance due to exposure of the cable to the environmental tests is optional.
4.7.8 Ambient light susceptibility (see 3.5.1.3). The ambient light susceptibility shall be measured in accordance with TIA-455-22,
with the exception that the output power in the "on" state shall be referenced to 1 milliwatt. The test temperature shall be +25°C±5°C.
4.7.9 Signal discontinuities (see 3.5.1.4). Signal discontinuities shall be measured in accordance with TIA-455-32. A signal
discontinuity is considered to be a reduction in signal strength of .5 dB or more for a duration of 50 µs or more. Setup and test
procedure shall conform to 4.7.5. Signal discontinuity shall be monitored with equipment in compliance with Measurement 2104 of MIL-
STD-1678-2 and having a time resolution sufficient to resolve discontinuities of 50 microseconds duration.
4.7.10 Return loss (SM) (see 3.5.1.5). Samples shall be tested for return loss in accordance with TIA-455-107. Upon completion
of each test, samples shall be examined for compliance to 3.5.1.5. Setup and test procedure shall conform to 4.7.5.
4.7.11 Cable retention. Specified inspections (see 3.1) from 4.7.11.1 through 4.7.11.4 shall be performed to verify conformance to
4.7.11.1 Tensile loading (see 3.5.2.1.1). Mated connector pairs shall be tested in accordance with Method 1 of TIA-455-6.
The axial tensile load shall be applied up to the load specified and shall be maintained for 1 minute unless otherwise specified (see
3.1). The change in optical transmittance shall be measured during and after the test (see 4.7.7). After the completion of the test, the
connector shall be visually examined in accordance with 4.7.2.
4.7.11.2 Cable strain relief (see 3.5.2.1.2). A visual inspection of the connector designs (plugs) and the specification sheet of
the unit shall be used to verify compliance to this requirement. Cable exiting a horizontal connector then placed in a vertical drip shall
exhibit a gradual versus a sharp bend (i.e., a cable bend within the long term bend diameter of the cable).
4.7.11.3 Flex life (see 3.5.2.1.3). The plug specimen of the connector mated pairs shall be tested for flex life in accordance
with TIA-455-1 except the cable interface or strain relief shall be flexed (versus the cable) using the setup as illustrated in figure 1 and
parameters specified in 4.7.11.3.1 with the cycling rate not exceeding 14 cycles per minute if the test is performed manually. The
specimen shall suffer no degradation in optical loss beyond the specified limits stated in 3.5.1.2, either during or after the test. At the
completion of the test, the connector shall be visually examined in accordance with 4.7.2.
4.7.11.3.1 Room temperature tests. The plug specimens shall be flexed for 2,000 cycles at a temperature of 23°C ± 5°C.
Flexing shall be in two planes, each mutually perpendicular to each other and to the face of the connector. The line of intersection of
the two planes shall pass through the center of the connector. Half the number of flexes shall be in one plane and half in the other
plane. Change in optical transmittance shall be measured after the completion of every five hundredth cycle during the test and after
the test.
4.7.11.4 Twist (see 3.5.2.1.4). Connector mated pairs shall be tested in accordance with TIA-455-36. The cable shall be
subjected to 1,000 twist cycles. (One cycle shall consist of a 180 degree twist ±90 degrees about the neutral axis.) The change in
optical transmittance (see 3.5.1.2) shall be measured at 250 cycle intervals. The optical performance shall not degrade beyond the
limits stated in 3.5.1.2 either during the test or subsequent to the test due to the twist cycling. At the completion of the test, the
connector shall be visually examined in accordance with 4.7.2.
4.7.12 Force to engage/disengage (see 3.5.2.2). The connector shall be engaged with its mating standard part (see 3.1). During
the entire coupling/uncoupling cycle (until the connector is fully engaged/disengaged), the forces or torques necessary shall not exceed
those specified (see 3.1). For a threaded connection, the unmated connectors shall be tested as follows: The two mating parts shall be
brought to a position where mechanical mating begins and the torque gauge is at zero indication. The parts shall then be fully mated or
coupled and the torque required for mating shall be recorded. The torque gauge shall then be reset to zero indication. The mated parts
shall be fully unmated and the torque required to un-mate shall be recorded.
4.7.13 Coupling proof torque (see 3.5.2.3). The connector under test shall be engaged with its mating standard part (gauge) and
the coupling nut tightened to the torque value specified (see 3.1). After 1 minute the connector under test and its mating standard part
shall be disengaged.
4.7.14 Coupling mechanism retention forces (see 3.5.2.4). The connector body and coupling mechanism shall be respectively
secured to the lower and upper jaws of a tensile tester in an appropriate manner. A tensile load shall be applied at a rate of
approximately 100 pounds/minute up to the force as specified and held at that value for 1 minute (see 3.1). During the one minute of
steadily applied force, the coupling mechanism shall be rotated with respect to the connector body, two full revolutions in each direction.
4.7.15 Mating durability (see 3.5.2.5.1). Connector mated pairs (including the plug to adapter to plug configuration) shall be tested
for mating durability in accordance with TIA-455-21 for a total of 500 mating cycles. The change in optical transmittance (3.5.1.2) shall
be measured after the completion of every one hundredth cycle. Cleaning of the ferrule end face is permitted during and after
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