MIL-DTL-17896E
the type of sampling plan (attribute, variable, or continuous) in accordance with MIL-STD-1916.
The sample size shall be selected in accordance with verification level I of MIL-STD-1916.
4.4.3 Sampling plan B tests. Sampling plan B tests are in addition to the individual and
sampling plan A tests and shall include the tests specified in 4.6.2 through 4.6.5. The
manufacturer shall select the type of sampling plan (attribute, variable, or continuous) in
accordance with MIL-STD-1916. The sample size shall be selected in accordance with
verification level I of MIL-STD-1916.
4.5 Visual, material, and dimensional inspection. The barometer shall be visually, materially,
and dimensionally examined to verify compliance with the requirements of this specification.
4.6 Tests.
4.6.1 Protection against over pressure and under pressure. At room temperature, the test
pressure shall be applied in the sequence shown in table II. Each pressure indicated in table II
shall be compared with the test standard. The test points at which data is taken shall have the
same pressure valve for increasing and decreasing pressure within 0.04 inch of the test standard
barometer during any one test cycle. The rate of pressure change between test points shall be not
greater than one inch per minute. This test shall not be interpolated in the test specified in 4.6.8.
Table II. Test procedure.
Increase
Decrease
pressure and
pressure and
Under pressure
hold for 5 to 15
Over pressure
hold for 5 to 15
Type
test (one hour)
minutes at
test (one hour)
minutes at
approximate
approximate
pressure shown
pressure shown
+0
+0.5
I
24
27, 29, 31
34
31, 29, 27
-0.5
-0
+0
+0.5
II
28
31, 33, 35,
38
35, 33, 31
-0.5
-0
Note: Pressure values are in inches of mercury.
4.6.2 Temperature compensation at ambient temperature. At any constant pressure
within the range of the dial, a change in temperature from 80 ºF ± 2 ºF to 40 ºF ± 2 ºF (26.7 ºC ±
1.1 ºC to 4.4 ºC ± 1.1 ºC), or vice versa shall not cause a change in indication greater than 0.04
inch. In making this test, the barometer shall be held at each temperature for at least one hour
before a reading is taken.
4.6.3 Temperature compensation at low and high temperature. At any constant pressure
in the range 29.4 through 30.6 inches, the sample barometer shall be subjected to a temperature
of 0 ºF (-17.8 °C) and the change of indication from the indication at room temperature noted.
The temperature shall then be raise to 115 ºF (46.1 °C) and the change in indication from the
indication at room temperature noted. The sample barometer shall be held at each temperature
for at least one hour before readings are taken; during this period the temperature shall not vary
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