MIL-DTL-5790H
4.6.6.4 Power supply variation. The transmitter shall be subjected to the scale error and
friction error tests during which the voltage and frequency shall be varied from 22V to 30V and
320 Hz to 400 Hz (or any combination thereof). The scale and friction errors shall not exceed
those specified in tables I and II.
4.6.6.5 Dielectric strength. A potential of 250 Vac shall be applied between each pin of
the electrical connector and the case for 5 seconds. There shall be no insulation breakdown.
4.6.6.6 Electrical zero. The transmitter shall have R2 connected to S2, and 26 Vac, 400 Hz
shall be applied to R1 and R2 for the following tests.
a. The electrical zero shall be found. It shall be where the voltage between S1 and S3 is at
a minimum.
b. The rotor shall be set to electrical zero. The rotor shall be rotated counterclockwise
180 degrees. The voltage S3S1 shall remain approximately in phase with the rotor voltage
between R1 and R2 throughout the entire 180 degree range.
c. The rotor shall be set to electrical zero and the voltage shall be near the minimum.
The rotor shall be rotated clockwise. The voltage between R1 and S3 shall be at a minimum
approximately 30 degrees clockwise of the electrical zero.
d. The rotor shall be returned to electrical zero. The rotor shall be rotated 30 degrees
clockwise from electrical zero. The voltage between S3 and S2 shall increase and the voltage
between S2 and S1 shall decrease during the rotation.
4.6.7 Low temperature (operational). The transmitter shall be subjected to a temperature
of -67 °F ± 3 °F for 4 hours while electrically connected to the MIL-I-7087 indicator with power
applied. At the end of the 4-hour period and while still at the specified temperature, the transmitter
shall be subjected to the scale error and friction error tests. The errors shall not exceed the
tolerances specified in tables I and II.
4.6.8 High temperature (operational). The transmitter shall be subjected to a temperature
of 250 °F ± 3 ºF for 6 hours while electrically connected to the MIL-I-7087 indicator with power
applied. At the end of the 6-hour period and while still at the specified temperature, the transmitter
shall be subjected to the scale error and friction error tests. The tolerances shall not exceed those
specified in tables I and II.
4.6.9 Vibration. The transmitter shall be subjected to a vibration test in accordance with
RTCA DO-160, using test levels specified in table III herein. At the end of this test, the
transmitter shall be subjected to the scale error test for upscale readings only. The scale errors
shall not exceed the tolerances specified in table I.
4.6.10 Indicator operation. The transmitter shall be subjected to scale error tests while
electrically connected to one MIL-I-7087 indicator. The transmitter shall then be subjected to
scale error tests while electrically connected to two MIL-I-7087 indicators. There shall be no
change in indicator readings.
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