MIL-DTL-38394E
3.5.2 Case pressure release. A blowout device shall be provided for releasing pressure in
the case. The transmitter shall be designed and constructed so that if the pressure sensor
connected to the pressure port leaks, the pressure in the case will be relieved and the escaping
fluid will be discharged through the vent port.
3.6 Electronic components. Electronic components and the application thereof should be
in accordance with MIL-HDBK-5400. Nonstandard parts shall not be used except with prior
approval of the procuring activity.
3.7 Electrical connector. An MS33678C-14S-2P hermetically sealed electrical
connector shall be provided.
3.8 Electrical characteristics. The transmitter synchro shall meet requirements of 3.8.1
through 3.8.4 with normal excitation of 26 Vac 400 Hz single-phase power applied to the
primary (rotor) from a source having electrical characteristics conforming to MIL-STD-704A (9
August 1966) for category B equipment.
3.8.1 Open secondary. The current drawn by the primary of the self-synchronous motor
shall not exceed 240 milliamperes (ma) with secondaries (stator) open circuited.
3.8.2 Power consumption. Power consumption of the transmitter synchro shall not
exceed 6.24 Volt-amperes.
3.8.3 Secondary voltage. The open-circuit voltage measured between any two secondary
leads shall be 11.8 ± 0.3 Vac. The variations between the three maximum secondary voltages on
any one synchro shall not exceed 0.2 Vac.
3.8.4 Power supply variation. The transmitter shall operate with a supply voltage
between 22 and 30 Vac at a frequency between 380 and 420 Hz.
3.9 Wiring.
3.9.1 External. The electrical receptacle shall be so wired that the 26 Vac 400 Hz power
supply will be connected to terminals A and B. External wiring between the transmitter and
indicator shall be as shown in figure 2.
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