MIL-DTL-24347B
4.5.8 Interference (see 3.17). The monitor shall meet the requirements of MIL-STD-461 for conducted and
radiated susceptibility and radiated emissions as applicable for its intended use.
4.5.9 Reliability. Reliability tests shall be as follows:
4.5.9.1 Demonstration phase. Unless otherwise specified (see 6.2), the demonstration phase of reliability testing
shall be conducted on at least 5 (but not more than 10) monitors. It is recommended that test plan IIID of
MIL-HDBK-781 be used as guidance in performing this testing. The upper test MTBF shall be as specified in 3.20.
4.5.9.2 Test schedule. The test shall consist of an uninterrupted series of three 8-hour periods per day. One of
the three periods shall be manned. The remaining two periods need not be manned.
4.5.9.3 Stress conditions. Unless otherwise specified below or in the contract or order (see 6.2), it is
recommended that the environmental and electrical stress conditions noted under the combined environments for
shipboard and underwater vehicle equipments in MIL-HDBK-781 be used as guidance for this testing.
a. Electrical stress: When operation from two or more nominal voltages is required, the nominal voltage for
reliability testing shall be the highest required nominal voltage.
b. Thermal stress: The test time for each thermal cycle shall be 8 hours.
4.5.9.4 Sampling phase. When specified (see 6.2), the sampling phase of reliability testing shall be conducted on
at least 5 (but not more than 10 monitors. It is recommended that test plan IVD of MIL-HDBK-781 be used as
guidance in performing this testing. The upper test MTBF shall be as specified in 3.20. The test schedule and stress
conditions of 4.5.9.2 and 4.5.9.3 shall apply.
4.5.10 Maintainability demonstration. When specified (see 6.2), conformance to 3.21 shall be verified through a
maintenance demonstration procedure, maintenance task selection, and maintenance task performance. It is
recommended that MIL-HDBK-470 be used as guidance in performing this demonstration.
4.5.11 Dielectric strength.
4.5.11.1 General. The dielectric strength test shall be conducted following completion of the tests specified in
4.5.1 through 4.5.9. the dielectric test shall be made upon the completely assembled equipment and not upon
individual parts (see 6.5).
4.5.11.2 Test voltage. The frequency of the testing voltage shall be not less than 60 Hz and shall approximate a
true sine wave. The value of test voltage shall be as specified in 3.14 and shall be applied continuously for 1 minute.
Rectifiers, bridges and zener references shall be shorted out before applying the voltage.
4.5.11.3 Measurement of test voltage. The measurement of the voltage used in dielectric tests shall be made by
the voltmeter method whereby the meter derives its voltage from the high-voltage circuit either directly or by means of
a voltmeter coil placed in the testing transformer, or through an auxiliary ratio transformer.
4.5.11.4 Points of application. The test voltage shall be successively applied between each electric circuit, and all
other electrical circuits and grounded metal parts not electrically connected to it.
4.5.12 Vibration. Equipment shall be subjected to type I vibration tests in accordance with MIL-STD-167/1, when
energized at approximately nominal voltage and frequency (see 3.15).
4.5.13 Voltage surge. The indicator shall be subjected to an impulse test of 450 volts with spikes to 2500 volts in
accordance with MIL-STD-1399/300.
4.5.14 Humidity. Humidity tests shall be in accordance with method 507.4, of MIL-STD-810.
4.5.15 Shock. Shock tests shall be conducted in accordance with MIL-S-901 for grade A, class I equipment (see
3.16). After the shock tests, the equipment shall be spot checked for the specified operation (see 3.4).
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