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High and low temperature soak and operation |
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|  MIL-F-26301F
3.5.4.2.2 Dual output circuits. When flashers are tested as specified in 4.4.2.2.2., the "on" time of one circuit shall
equal the "off" time of the other and vice versa within 5 percent.
3.5.4.3 Switching time. When flashers are tested as specified in 4.4.2.3, the switching time shall be as specified in
3.5.4.3.1 and 3.5.4.3.2, as applicable.
3.5.4.3.1 DC flashers. The elapsed time for switching the "off" to "on" or "on" to "off" condition shall be not greater
than 0.03 second for dc flashers.
3.5.4.3.2 AC flashers. Zero crossover switching shall be used for initiation and termination of the "on" time of each
cycle. Initiation of the "on" time shall coincide with zero voltage crossover and termination of "on" time shall coincide
with zero current crossover within 20 degrees, respectively.
3.6 Voltage drop. Flashers shall be tested as specified in 4.4.3 and unless otherwise specified (see 3.1), the
voltage drop within the flasher shall not exceed 4.0 percent of the input voltage for any value of load within the
specified limits.
3.7 High and low temperature soak and operation. When tested as specified in 4.4.4, flashers shall operate
satisfactorily when tested under the following conditions.
3.7.1 High temperature. At 71C (unless otherwise specified) (see 3.1), following the soak period specified in
4.4.4.1, flashers shall meet the requirements of 3.5.4.1, 3.5.4.2, 3.5.4.3, and 3.6, as applicable.
3.7.2 Low temperature. At -62C and -54C, following the soak period specified in 4.4.4.2, flashers shall meet the
requirements of 3.5.4.1, 3.5.4.2, 3.5.4.3, and 3.6, as applicable. There shall be no distortions, cracking, differential
expansion or pliability of nonmetallic parts.
3.8 Vibration. After flashers are tested as specified in 4.4.5, they shall meet the requirements of 3.5.4.1, 3.5.4.2,
3.5.4.3, and 3.6, as applicable.
3.9 Immersion. When flashers are tested as specified in 4.4.6, there shall be no damage that would affect
subsequent operation.
3.10 Shock. After flashers are tested as specified in 4.4.7, they shall meet the requirements of 3.5.4.1 and 3.5.4.2,
as applicable.
3.11 Altitude. When flashers are tested as specified in 4.4.8, there shall be no damage that would affect
subsequent operation.
3.12 Humidity. After flashers are tested as specified in 4.4.9, they shall meet the requirements of 3.5.4.1 and
3.5.4.2, as applicable.
3.13 Salt fog. When flashers are tested as specified in 4.4.10, they shall meet the requirements of 3.5.4.1, 3.5.4.2,
and 3.5.4.3, as applicable.
3.14 Sand and dust (when specified) (see 3.1). When flashers are tested as specified in 4.4.11, they shall meet the
requirements of 3.5.4.1, 3.5.4.2, and 3.5.4.3, as applicable.
3.15 Electromagnetic interference. When flashers are tested as specified in 4.4.12, they shall meet the
requirements of MIL-STD-461, equipment class A-1. Following the test, flashers shall meet the requirements of
3.5.4.1 and 3.5.4.2, as applicable.
3.16 Transient voltage. When flashers are tested as specified in 4.4.13, there shall be no evidence of damage.
3.17 Life. When flashers are continuously operated as specified in 4.4.14 for the specified period of time (see 3.1),
there shall be no failures. Following this test, flashers shall meet the requirements of 3.5.4.1, 3.5.4.2, 3.5.4.3, and
3.6, as applicable.
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