MIL-DTL-5099C
TABLE V. Hysteresis.
Equivalent
Permissible
Standard altitude
atmospheric pressure
Variation
(inches Hg) 1
(±feet)
Test points
(feet)
First point
25,000
11.104
300
Second point
20,000
13.750
300
Third point
-
Ground level
150
1
Aeronautical pressure equivalents are listed from MIL-STD-859.
4.5.4.1 After effect. Not less than 1 minute and not more than 5 minutes after the
completion of the hysteresis test, the pointer shall have returned to its original reading, corrected
for any change in atmospheric pressure, within the tolerance given in table V at the third test
point.
4.5.5 Position error. At normal atmospheric pressure, the indicator shall be held in the
normal operating position, tapped in accordance with 4.4.2, and a reading taken. The procedure
shall be repeated at 90-degree increments as the indicator is rotated 360 degrees about each
horizontal axis. The maximum deviation of the latter readings from the original reading shall not
exceed 200 feet.
4.5.6 Friction. The indicator shall be tested for friction at each of the test points listed in
table VI. The pressure shall be decreased to bring the pointer in approximation to the desired
reading, then held constant while two readings are taken: the first, before the indicator is tapped,
and the second, after the indicator has been tapped. The difference of any two such readings
shall be recorded as friction and shall not exceed the tolerances specified in table VI. This test
may be combined with the test for scale error at room temperature. At the option of the
government inspector, any other points may be tested for compliance with the above test.
TABLE VI. Friction.
Altitude
Tolerance
(feet)
(±feet)
1,000
200
2,000
200
3,000
200
5,000
200
10,000
200
15,000
200
20,000
300
25,000
300
30,000
300
35,000
400
40,000
500
50,000
700
13
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