MIL-DTL-17896E
vibrated before each test reading is taken. Vertical shall be considered the position in which the
instrument will normally be mounted against a vertical plane with the 30.0-inch mark approximately
at the highest point of the scales. Whenever atmospheric pressure or pressure variation is indicated
in inches in this specification, it shall be construed as pressure or variation in inches of mercury.
4.2.1 Inspection standards. Prior to conducting the inspections, the manufacturer shall
submit a complete description of the prime standards and the test standards proposed for the
inspection of the barometer.
4.2.1.1 Prime standard. The prime standard shall be a mercurial manometer traceable to
the National Institute of Standards and Technology (NIST).
4.2.1.2 Test standard. The test standard shall be a mercurial or aneroid manometer. The
test standard, when compared to the prime standard on two successive runs, shall be able to
repeat readings at the same points throughout the range within 0.005 inches.
4.3 First article inspection. First article inspection shall consist of the tests shown in
table I. Shock and vibration tests shall be conducted after completion of all other tests.
Table I. First article inspection.
Inspectio
Requirement
Inspection
n
paragraph
h
Examination, visual, material, and dimensional
-----
4.5
Protection, over/under pressure
3.8.2
4.6.1
Temperature compensation at ambient temperature
3.9
4.6.2
Temperature compensation at low and high
3.9
4.6.3
Shock
3.9
4.6.4
Vibration
3.9
4.6.5
Salt fog
3.9
4.6.6
Position compensating
3.8.1
4.6.7
Accuracy calibration error
3.10
4.6.8
Hysteresis
3.10
4.6.10
Friction
3.10
4.6.11
4.4 Conformance inspection. Conformance inspection shall be in accordance with
MIL-STD-1916 and shall consist of the individual tests (see 4.4.1) for each unit produced, as well
as sampling plan A tests (see 4.4.2) or sampling plan B tests (see 4.4.3), as specified (see 6.2).
4.4.1 Individual tests. Each unit shall be subjected to the inspection specified in 4.5.
4.4.2 Sampling plan A tests. Sampling plan A tests are in addition to the individual tests
and shall include the tests specified in 4.6.1, 4.6.7, 4.6.8, and 4.6.9. The manufacturer shall select
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