3.6.7 Electron image shift.- Subsequent to vibration and shock,
the elbow assembly shall be subjected to ten cycles of power on and
power off at rated voltage; the voltage being applied for 15 seconds and
removed for 10 seconds. The collimation of the elbow assembly at the
expiration of each on period shall not deviate more than 0.3 mil.
3.6.8 Image centering.- An incident line of sight perpendicular
to Datum Plane "X" (within 0.3 mil) shall appear centered in the eyepiece
field of view within 2.5 degrees relative to an exit axis parallel to
the datum plane specified above.
3.6.9 Objective focusing range.- Rotation of Ring 11733436 shall
cause the objective to bring targets from 50 meters to 3000 meters into
3.6.10 Resolution. - The elbow assembly shall be capable of resolv-
ing the following vaules (for the axis specified when observing a resolu-
tion target having the background luminance in foot lamberts (ft-1) and
the contrast specified. Contrast (for the purpose of this requirement)
is defined as the difference in density between the dark lines and the
black and clear)
2.0 or greater
1 to 5 x 10-3 ft-1
2.0 or greater
6 x 10-5 ft-1 or less
3.6.11 Luminance gain. - The luminance gain shall be no less than
625, when viewing an evenly illuminated field at 5 x 10-4 ft-lamberts with
the gain control turned fully clockwise.
126.96.36.199 Gain control. - When viewing an evenly illuminated field
at 5 x 10-4 ft-lamberts, the system gain shall vary as a function of the
position of the gain control knob. Minimum gain shal be at the full
counterclockwise position and increase steadily as the gain control
varies to the full clockwise limit.
3.6.12 Field fo view. - The field of view shall be not less than
3.6.13 Projected reticle pattern.
188.8.131.52 Reticle image. - The image of the reticle pattern shall
be well defined and clearly visible when viewed with the unaided eye
under the following conditions:
a. The entrance window covered to prevent entrance of light,
b. The elbow assembly viewing an evenly illuminated field of
not less than 1 to 5 x 10-³ foot lamberts luminance and the reticle
voltage set at 18 VDC.