MIL-DTL-62545E
4.6.5.3 Input voltage decay. To determine conformance to 3.3.10.3, the MSEC shall be connected to a variable
power supply capable of 40 A current draw. Set the power supply at 30 V dc, with the MSEC in the quiescent mode.
Gradually decrease the voltage to zero over 5 to 10 minutes. There shall be no output signals at pins L, T, and V of
connector J1 and pins A, F, L, and S of connector J2. The test shall be repeated three times.
4.6.5.4 Steady state voltage extremes. To determine conformance to 3.3.10.4, the MSEC shall be connected to a
variable power supply. The voltage shall be set at 5 V dc for 3 minutes of quiescent operation. Voltage shall then be
increased in 5 V dc increments for 3-minute intervals until reaching 40 V dc. The MSEC shall subsequently pass the
4.6.6 Polarity. To determine conformance to 3.3.11, the MSEC shall be connected for 28 V dc battery operation
with negative ground. The connections on the battery then shall be reversed to create the reverse polarity condition
and remain in this state for 30 minutes. The MSEC shall then be rewired properly and shall evidence no damage or
performance degradation.
4.6.7 Performance.
4.6.7.1 Response time. To determine conformance to 3.4.1, the MSEC's response time shall be measured at
supply voltages of 16, 24, and 30 V dc. The response time shall be not more than 2 ms. This test shall be conducted
at -17°C to +71°C (+1°F to +160°F).
4.6.7.2 Small fire logic. To determine conformance to 3.4.2, small fire signals corresponding to signal A of table I
shall be sequentially applied to each of the four small fire signal pins within connector J3 (see table IV). The output
signals on the fire warning lamp and audible fire warning pins in connector J1 shall be as specified in table II.
4.6.7.3 Large fire logic. To determine conformance to 3.4.3, the MSEC shall be wired to short circuit appropriate
pins in connector J2 (see table III) to simulate the availability of four extinguishers. A large fire signal and a small fire
signal shall be supplied simultaneously for 1 to 2 s at one of the OFSA inputs (see table IV). Response to this signal
shall be extinguisher drive signals as indicated in table III. The signals shall be produced at the proper time and in
the sequence indicated in figure 1. The test shall be repeated three times (one for each remaining large fire input).
4.6.7.4 Electrical-manual release. To determine conformance to 3.4.4, the electrical-manual release signal
specified in table II shall be supplied to pin G of connector J1, and shall result in output signals on the appropriate
extinguisher activation sockets of connector J2 (see table III).
4.6.7.5 Extinguisher status. To determine conformance to 3.4.5, continuity shall be established on appropriate
sockets of connector J2 with the necessary signals to simulate extinguishers in the circuit. Continuity shall be
interrupted and then restored for the extinguisher activation circuit and then the pressure/flow circuit. The
extinguisher status lamp pins of connector J1 (see table II) shall be monitored for the appropriate outputs. This shall
be repeated for each of the four simulated extinguishers.
4.6.7.6 BITE. To determine conformance to 3.4.6, the MSEC shall be wired such that BITE signals produced at
appropriate sockets (one for each OFSA) of connector J3 (see table IV and figure 3) are returned to both associated
fire signal pins. Upon receipt of a BITE activation signal at the appropriate pin of connector J1 (see table II), a BITE
"pass" signal shall be produced at pin J of connector J1 (see table II). The wiring shall be changed so that one or
more of the BITE signals are not returned to the MSEC. Upon receipt of a BITE activation signal, BITE "fail" signals
shall be generated at the appropriate pins of connector J1 (see table II).
4.6.7.7 EMI. To determine conformance to 3.4.7, the MSEC shall be subjected to the tests of MIL-STD-461 and
figure 4. Narrowband conducted emissions of figure 4 shall be verified in accordance with the basic methodology of
MIL-STD-461. The MSEC shall not false alarm or cause any EMI problems for other vehicle components.
4.6.7.8 Nuclear hardening (see 6.6).
4.6.7.8.1 Qualification. Conformance to 3.4.8 shall be determined on the basis of circuit analysis or component
testing.
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