MIL-DTL-5790H
4.5.4 Rejection and retest. Any transmitter failing to meet the individual tests and the
sampling plan A or B tests shall be cause for rejection of the lot. Transmitters that have been
rejected may be replaced or repaired and the lot retested using a tightened sample size in
accordance with verification level II of MIL-STD-1916. Prior to retesting, the manufacturer shall
provide in writing to the procuring activity all corrective actions taken to correct the defect(s).
Units rejected after retest shall not be resubmitted and the lot rejected unless specific approval is
authorized by the procuring activity granting additional corrective actions and testing.
4.6 Test methods.
4.6.1 Examination of product. The transmitter shall be inspected to determine compliance
with the requirements specified herein with respect to materials, workmanship, marking, and all
other requirements not covered by tests.
4.6.2 Scale error. The transmitter shall be tested for scale errors at the test points specified
in table I for both upscale and downscale readings. The test points on the upscale readings shall be
measured by bringing the input reading up to, but not exceeding, the specified test point. The
transmitter shall then be vibrated at a frequency of 3,600 Hz with amplitude of 0.002 inch. The
difference in the scale error after vibration from the true input value shall not exceed the scale error
tolerance specified in table I. The downscale error shall be measured in the same manner, except
that the input reading value shall be brought down to, but not below, the specified test point.
4.6.3 Friction error. The difference in transmitter output prior to vibration specified in
4.6.2 and after application of this vibration is friction error. Friction error shall not exceed the
tolerance specified in table II.
4.6.4 Position error (attitude). The transmitter shall be energized to obtain a reading of
one half scale on the indicator conforming to MIL-I-7087. The change in indication produced by
rotating the transmitter from the normal operating position to a position 90 degrees clockwise and
counterclockwise (longitudinal axis vertical) shall not exceed the tolerance specified for position
error in table II. The position error test may be conducted in conjunction with the scale error test.
4.6.5 Case leakage. The transmitter case shall be tested for leaks by means of a mass
spectrometer helium detector. Where a nitrogen-helium mixture is used as the fill medium, the
detected leak rate shall not exceed 0.10 micron cubic foot per hour. Where 100 percent helium is
used as the fill medium, the leak rate shall not exceed 1.0 micron cubic foot per hour.
4.6.6 Electrical characteristics. The transmitter shall be tested in accordance with 4.6.6.1
through 4.6.6.6 to determine compliance with 3.6.8.
4.6.6.1 Open secondary. The transmitter shall be tested for compliance with 3.6.8.1.
4.6.6.2 Power consumption. The transmitter shall be tested for compliance with 3.6.8.2.
4.6.6.3 Secondary voltage. The transmitter shall be tested for compliance with 3.6.8.3.
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