MIL-DTL-5790H
3.6.5 Seasoning. The transmitter shall withstand 10,000 applications of pressure as
required to produce indications from 0 to 85 ± 5 percent of full scale and return to 0 at a rate of
30 ± 10 cycles per minute (cpm).
3.6.6 Damping. When 200 psi is applied to the transmitter, the time required for the
pressure to drop to 20 psi when pressure is removed shall be 9 ± 3 seconds.
3.6.7 Torque. The transmitter shall develop a torque in the MIL-I-7087 indicator of no
less than 2,000 milligram millimeters per degree of angular displacement.
3.6.8 Electrical characteristics. The transmitter synchro shall have electrical characteristics
compatible with SAE AS20708 and the requirements specified in 3.6.8.1 through 3.6.8.6.
3.6.8.1 Open secondary. The current drawn by the synchro shall not exceed 240 milliamperes
with secondary (stator) open-circuited.
3.6.8.2 Power consumption. The transmitter power consumption shall not exceed
6.24 volt-amperes.
3.6.8.3 Secondary voltage. The open-circuit voltage measured between any two
secondary leads shall be 11.8 ± 0.3 volts alternating current (Vac). The variation between the
three maximum secondary voltages on any one synchro shall not exceed 0.2 Vac.
3.6.8.4 Power supply variation. The transmitter shall operate with a supply voltage
between 22 and 30Vac at a frequency between 320 and 400 hertz (Hz).
3.6.8.5 Dielectric strength. The transmitter shall withstand a potential of 250 Vac,
60 Hz for 5 seconds between each pin of the electrical connector and the transmitter case.
3.6.8.6 Electrical zero. With R2 connected to S2, and 26 Vac, 400 Hz electrical power
applied to R1 and R2, the transmitter shall meet the following requirements:
a. The voltage between S1 and S3 (S3S1) shall be at minimum, in-phase with rotor
voltage E (R2R1), and remain approximately in-phase as the rotor is turned counterclockwise
through an angle not exceeding 180 degrees from electrical zero.
b. The voltage between R1 and S3 shall be at a minimum null and shall reach the
minimum when the rotor is turned clockwise 30 degrees from electrical zero.
c. Clockwise rotation of the rotor, not exceeding 30 degrees from electrical zero, shall
cause an increase in voltage between S3 and S2 and a decrease in voltage between S2 and S1.
3.6.9 Environmental conditions. The transmitter shall withstand the environmental
conditions specified in 3.6.9.1 through 3.6.9.5.
3.6.9.1 Humidity. The transmitter shall withstand humidity of 95 percent.
3.6.9.2 Shock. The transmitter shall withstand a 20g shock for 11 milliseconds.
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