MIL-DTL-83361B
3.3.11 Synchros. The indicator synchros shall consist of a salient two-pole wound rotor
used as the primary and shall be designed for 26 volt (V) 400 Hertz (Hz) single-phase power in
accordance with MIL-STD-704, with y-connected stators as secondaries. The stators shall be
wound so that the amplitudes of the induced voltages measured between any two stator leads
will vary approximately sinusoidally with the angular position of the rotor. Pivots, bearings, and
gears shall not bind nor shake and shall be as nearly frictionless as possible.
3.3.11.1 Synchro receivers. Synchro receivers shall have electrical characteristics
compatible with those defined in MIL-STD-461.
3.3.12 Secondary voltage. The maximum open-circuit voltage measured between any
two secondary leads shall be 11.8 V ± 3 percent.
3.3.13 Reliability (life). The indicator shall have a mean-time-between-failure (MTBF)
of 2,000 hours at a 50 percent confidence level.
3.3.14 Maintainability. No preventive maintenance shall be required throughout the
service life of the indicator. The mean-time-between-maintenance (MTBM) shall not exceed the
MTBF. Fault isolation and repair within the hermetically sealed indicator shall be accomplished
at the depot level.
3.4 Performance. The indicator shall operate as specified herein during and after
subjection to the following conditions:
a. Temperatures: temperatures ranging from -80 °F to 160 °F (-62 ºC to 71 ºC).
b Vibration: vibration of 2 g from 5 Hz to 500 Hz.
c. Temperature-altitude: pressure altitude of 100,000 feet at -67 °F (-55 ºC).
d. Salt-fog: exposure to salt sea atmosphere for 48 hours without evidence of corrosion or
deterioration.
e. Shock: up to 20 g for 11 milliseconds.
TABLE II. Scale error.
Tolerance
PSI
±PSI
0
1.0
20
1.0
40
1.0
60
1.0
80
1.0
100
1.0
9
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