MIL-DTL-9320E
4.5.6 Audio and flashing lamp output circuits. The dB levels shall be measured with a
thermovoltmeter connected across a 150-ohm resistive load. The 150-ohm load shall be the
combined parallel impedance of the thermovoltmeter used and the load resistor. The voltage
readings shall be converted to dB readings. The 0 dB reading shall be the base of 1 mW into the
150 ohm load. Direct current of 28 V DC shall be applied to the warning signal. Terminal G of
the connector shall be connected to the flasher circuitry internally and to an MS-type lamp
externally. The warning signal dB levels and flashing lamp on/off cycle shall be as specified in
3.4.1.1, 3.4.1.3, table I, 3.4.1.4, and 3.4.1.5.
4.5.7 Frequency and interruption rate. When loaded as specified in 3.4.2.2 and tested by
monitoring the output warning signal with an oscilloscope, the warning signal shall meet the
requirements of 3.4.1 and 3.4.1.1.
4.5.8 Reliability test. The warning signal shall be tested for reliability with a duty cycle of
250 hours continuous operation, followed by 250 hours cycling, 1 minute on and 1 minute off, at a
normal input voltage and simulated load of 150 ohms between pin C and ground. Following the test,
the warning signal shall meet the output requirements of 3.4.1.1.
4.5.9 Vibration. The warning signal shall be subjected to a vibration test in accordance
with MIL-STD-810, method 514, "Vibration". The warning signal shall meet the vibration
requirements specified in 3.4.6 (a).
4.5.10 Shock. The warning signal shall be subjected to a shock test in accordance with
MIL-STD-810, method 516, "Shock", except that the magnitude of each shock impulse shall be
50 g. The warning signal shall meet the shock requirements specified in 3.4.6 (b).
4.5.11 High altitude - low temperature. The warning signal shall be placed in an altitude
chamber maintained at a temperature of -65 °C and the pressure reduced to simulate an altitude
condition of 80,000 feet for 4 hours. The warning signal shall meet the high altitude - low
temperature requirements of 3.4.6 (c). After returning to room temperature, the warning signal shall
be examined for any evidence of damage and shall operate as specified herein.
4.5.12 Hermetic seal. The warning signal shall be placed in a transparent container filled
with ethylene glycol or water and placed in an altitude chamber equipped with a view plate or
bell jar. The pressure shall be reduced to 20 mmHg or less (approximately 81,000 feet altitude)
and maintained at this pressure for 30 minutes. Any leakage as indicated by bubbles shall
constitute failure.
4.5.13 High temperature. The warning signal shall be subjected to a high temperature
test in accordance with MIL-STD-810, method 501, "High Temperature", except that the
temperature shall be 125 °C. The warning signal shall meet the high temperature operation
requirements of 3.4.6 (d). During the final hour of this test, the signal shall operate as specified
herein.
10
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business