MIL-DTL-52869C
A, Test Method 5), the amplitude measured at TP2 in step 2.h. shall be within
±3 dB of that measured at room temperature (75 ±5 °F).
4.4.2.5.2 High temperature. High temperature test shall be conducted in
accordance with high temperature test procedure of Appendix B (see B.4.2).
When performing the functional test at +150 °F for the complete PUS (Appendix
A, Test Method 5), the amplitude measured at TP2 in step 2.h. shall be within
±3 dB of that measured at room temperature (75 ±5 °F).
4.4.2.5.3 Humidity. Humidity test shall be conducted in accordance with
the humidity test procedure of Appendix B (see B.4.3).
4.4.2.5.4 Shock. Shock test (bench handling) shall be conducted in
accordance with shock test of Appendix B (see B.4.4).
4.4.2.5.5 Failure criteria.
Nonconformance to 3.4 shall constitute
failure of these tests.
4.4.2.6 Electromagnetic susceptibility. When specified (see 6.2), one
PUS, consisting of one processor and one receiver, shall be subjected to the
following electromagnetic susceptibility tests of MIL-STD-461.
4.4.2.6.1 Radiated susceptibility. Conduct Test Method RS103, except that
the electric field requirements of RS103 shall be modified and limited as
specified in 3.6.1. All leads (sensor, alarm and power) external to the
signal processor enclosure shall be exposed to the electrical field. The
leads shall not be less than 4 feet in length.
4.4.2.6.2 Conducted susceptibility.
Conduct Test Method CS101, as
modified in 3.6.2.
4.4.2.6.3 Failure criteria.
Nonconformance to 3.6 shall constitute
failure of this test.
4.4.2.7 Reliability. Using an upper test MTBF (θ0) of 10,000 hours and
lower test MTBF (θ1) of 5,000 hours, the PUS shall be tested as specified
herein, with "accept" and "reject" criteria in accordance with MIL-HDBK-781,
test plan VIIID. Continue testing until either an "accept" or "reject"
decision is reached. All test incidents will be scored by the Government. A
failure is defined as any malfunction which causes or may cause one or more of
the following:
a.
Failure to commence operation, cessation of operation, or degradation
of performance below designated levels.
b.
Serious damage to the system.
c.
Serious personnel safety hazards.
4.4.2.7.1 Test procedure. Unless otherwise specified (see 6.2), twelve
complete PUSs, each consisting of one processor and one receiver, shall be
randomly selected by a Government representative. The tests shall be
conducted under ambient laboratory conditions, without temperature, humidity
or vibration cycling. Equipment shall be energized at the power input
specified in 3.5.2.1. Operation shall be continuous throughout the test. The
5-second test signal in 2f. of Appendix A test method 5 shall be applied to
each PUS not less than nine times during each 24-hour period, but not more
often than once per hour. At the end of the reliability test, the PUS shall
be subjected to the tests specified in 4.4.2.4.1 and 4.4.2.4.2. The test
shall commence only after successful completion of functional tests of each
unit. Parts or components of known limited life, such as batteries, shall
have a life stipulated prior to test. Failure of these parts occurring after
the end of the stipulated period are non-relevant, but any dependent failures
caused thereby are relevant. Failures chargeable to workmanship deficiencies
shall be counted as relevant. Alarms not deliberately excited as part of the
equipment test routine shall be reported and cause of the alarm identified, if
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