 |
|||
|
Page Title:
Performance between +60 and +900F. |
|
||
| ||||||||||
|
|  MIL-S-60828A(MU)
4.6.2.3 Range control knob.- Utilize the test procedure in 4.6.4.18,
and determine that range knob torque measurements do not exceed the values
measured in 4.6.4.18 by more than 10 pound-inches at each extreme tempera-
ture in 3.5.
4.6.2.4 Arm 10547473.- Utilize the test procedure in 4.6.4.17, and
determine that Arm 10547473 torque requirements do not exceed the values
obtained in 4.6.4.17 by more than 10 pound-inches at each extreme tempera-
ture in 3.5. Operating and stowed positions shall be as specified on
Drawing F10547304. Observe that Arm 10547473 moves freely between operating
and stowed positions and determine that the mechanism provided will fasten
it in both positions.
4.6.3 Humidit Y.- This test shall be performed subsequent to the
sealing test and prior to the interior atmosphere test. Except as specified
herein, conduct this test in accordance with the "Test Facilities" and
"Humidity (Procedure III)" requirements of MIL-F-13926. The sight shall
be exposed for at least 24 hours to a 97% relative humidity (RH) at an
ambient temperature of +160F. Chamber temperature shall then be lowered
to between 60" and +900F with condensation and the sight exposed to this
condition for at least four hours-within which time chamber temperature may
be adjusted to obtain other condensation periods. The humidity phase of
..
this test shall now cease and the external surface of the sight shall be
.
dried by wiping all accessible areas. Drying by air blast or in an oven
shall not be permitted. Pins of electrical connectors that are not exposed
q
when in use shall be covered during this test.
4.6.4 Performance between +60 and +900F.- Unless otherwise specified,
the following tests shall be performed using, as applicable, the test set-up
and test procedure in subparagraphs "a" and "b" respectively, and operating
instructions associated with final inspection fixtures.
a. Test set-up.- On a cross leveled surface position and secure
the medium (fixture) provided to hold and position the sight. Locate on the
fixture axes which correspond to axes "X" and "W" on the sight (see Figure
1)
Axis "X" is in a plumb longitudinal-plane, and axis "W" is in a level
q
longitudinal plane. Establish in space, a geometric axis parallel to the
planes containing axes "X" and "W". Vertical and horizontal lines of
targets and retitles to be used in the following tests shall be made plumb
and level, respectively. The electrical dc power source, dc voltammeter,
and time measuring instrument shall be conveniently located relative to the
fixture.
b. Test procedure.- Securely position the sight in its fixture
in accordance with axes on the sight designated "X" and "W" in Figure 1.
Make the necessary electrical connections to apply and verify a sight
input potential of 28 vdc with provision for monitoring sight input current
during tests. With the filament selector switch in an "ON" position,
adjust the sight's light intensity control for optimum viewing of the
projected reticle image. While maintaining the parallelism of the geometric
12
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals