 |
|||
|
Page Title:
High and low temperature soak and operation |
|
||
| ||||||||||
|
|  MIL-F-26301F
4.4.2.2 Flash cycle (on-to-off ratio) (see 3.5.4.2). Flashers shall be tested at an atmospheric pressure of
approximately 29.92 inches and a room temperature of 23C 5C over the input voltage range specified in 3.5.2.
4.4.2.2.1 Single output circuits (see 3.5.4.2.1). Flashers shall be operated for 5 minutes for compliance with the
flash cycle requirements by loading in turn with a maximum and minimum lamp load as specified in table I. The flash
cycle shall be as specified in 3.5.4.2.1.
4.4.2.2.2 Dual output circuits (see 3.5.4.2.2). Flashers shall be operated as specified in 4.4.2.2.1 except that the
operation cycle shall be 10 minutes. The flash cycle shall be as specified in 3.5.4.2.2.
4.4.2.3 Switching time (see 3.5.4.3). Flashers shall be tested with rated input voltage and rated lamp load applied
(see 3.1).
4.4.3 Voltage drop (see 3.6). Flashers shall be operated for 10 minutes each at minimum rated and maximum
rated voltages, and maximum rated lamp load. Unless otherwise specified (see 3.1), the voltage drop in the lamp
load shall not exceed 4.0 percent of the applied input voltage.
4.4.4 High and low temperature soak and operation (see 3.7). Environmental tests shall be conducted in
accordance with the following procedures of MIL-STD-810.
4.4.4.1 High temperature (see 3.7.1). Flashers shall be subjected to high temperature testing in accordance with
procedure I, method 501, except that the soak period shall be for 24 hours in lieu of 48 hours. At the completion of
the 24-hour soak period, the flashers shall be operated at the soak temperature (71C) and tested as specified in
4.4.2.1, 4.4.2.2, 4.4.2.3, and 4.4.3, as applicable.
4.4.4.2 Low temperature (see 3.7.2). Flashers shall be subjected to low temperature in accordance with
procedure I, method 502. Flashers shall be exposed to, but not operated in, an ambient temperature of -62C for a
period of 48 hours. The temperature of the chamber shall be raised to -54C and maintained for an additional 24
hour period or until temperature stabilization is reached. While the flashers are being maintained at -54C, the
minimum specified input voltage shall be applied to the input terminals and the minimum specified lamp load
connected to the output. The flashers shall begin to operate at the specified flash rate (see 3.1) within 30 seconds
after the input power is applied. Operation shall continue at the low temperature for a period of 10 minutes with the
voltage held at the same rated value as was used to start the flasher. At the end of the test, flashers shall be tested
as specified in 4.4.2.1, 4.4.2.2, 4.4.2.3, and 4.4.3, as applicable, except that the flashers shall be operated at rated
voltage and rated lamp load (see 3.1).
4.4.5 Vibration (see 3.8). Flashers shall be subjected to vibration in accordance with procedure I, curve AT,
method 514, of MIL-STD-810, except the frequency range shall extend from 500 Hz to 1500 Hz at 10 G's. During the
entire test, the flashers shall be operated and connected to flash the lamp load specified in 4.4.14. Flashers shall be
tested as specified in 4.4.2.1, 4.4.2.2, 4.4.2.3, and 4.4.3, as applicable, except that flashers shall be tested at rated
input voltage and rated lamp load (see 3.1).
4.4.6 Immersion (3.9).
4.4.6.1 Gasoline resistance. Flashers shall be immersed in a high-test gasoline of any grade conforming to ASTM
D910 for a period of 1 hour at a temperature of 23C 5C. Flashers shall then be removed from the test fluid and
allowed to drain for 1 hour at room temperature. There shall be no swelling of seals, gaskets, or other components.
There shall be no separation of components, dissolving of compounds or adhesives, or deterioration that would
cause the flashers to fail if exposed to gasoline in service.
4.4.6.2 Jet fuel resistance. Flashers shall be immersed in JP-4 fuel conforming to MIL-DTL-5624 for a period of 1
hour at a temperature of 23C 5C. Flashers shall then be removed and allowed to drain for 1 hour at room
temperature. There shall be no swelling of seals, gaskets, or other components. There shall be no separation of
components, dissolving of compounds or adhesives, or deterioration that would cause the flashers to fail if exposed
to jet fuel in service.
9
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals