 |
|||
|
Page Title:
Parallelism of conventional reticle and image |
|
||
| ||||||||||
|
|  MIL-T-60826B(MU)
4.6.7.1.15 Parallelism of conventional reticle and image. - Actuate
the reticle selector switch to illuminate the conventional reticle. Sight
through the eyepiece of the telescope and obtain coincidence of one end
of the telescope's 1600 meter horizontal reticle line (total length of
dashes and spaces) with that of a horizontal target line. Then observe
for coincidence at the opposite end of the reticle line. The horizontal
line shall be parallel to the horizontal target line within the tolerance
specified in 3.6.1.12.2, as measured on the target. Deviation shall be
noted and recorded.
4.6.7.1.16 Variation of settings. - The angular difference between
the recorded deviation for the missile reticle and conventional reticle
obtained in 4.6.7.1.14 and 4.6.7.1.15 shall not exceed the tolerance
specified in 3.6.1.12.3.
4.6.7.2 Twelve power (12X) system. - The following tests shall be
conducted with the power selector lever at the 12X position, except as
otherwise specified, and the telescope eyepiece housing assembly positioned
as specified in 3.6.
4.6.7.2.1 Reticle image shift at eyepiece. - Actuate the reticle
selector switch to illuminate the missile reticle. Move the power selector
lever to the 8X position. Affix an auxiliary telescope to the eyepiece
of the telescope under test. The reticle pattern of the auxiliary teles-
cope shall contain a vertical and horizontal reticle line, and shall also
contain etch data capable of measuring 5 degrees of reticle image shift.
The auxiliary telescope shall be of at least 3 power (3X). Obtain coin-
cidence of the intersecting point of the auxiliary telescope reticle lines
with the intersecting point of the horizontal and vertical reticle lines
(boresight point) of the missile reticle, and plumb the vertical reticle
line of the auxiliary telescope. The image of the telescope reticle
boresight point shall not deviate in excess of the tolerance specified
in 3.6.2.1 when the power selector lever is moved to the 12X position.
Reticle image shift shall be measured on the auxiliary telescope reticle
with reference to the telescope reticle.
4.6.7.2.2 Focal plane shift. - The test shall be made with the aid
of a calibrated dioptometer with a magnification of at least 3 power
(3X). Adjust the dioptometer eyepiece for best focus of the dioptometer
reticle and set the dioptometer diopter scale to zero. Set the diopter
scale of the telescope under test to zero diopter. Position the diopto-
meter behind the eyepiece assembly. Move the power selector lever of the
telescope to the 8X position. Obtain best focus of the telescope missile
reticle by adjustment of the dioptometer diopter scale. Note the diopter
setting on the dioptometer diopter scale. Move the power selector lever
of the telescope to the 12X position. Again obtain best focus of the
missile reticle by adjustment of the dioptometer diopter scale. Note the
diopter setting on the dioptometer diopter scale. Any difference between
the dioptometer diopter scale setting for the 8X system and the 12X system
shall not exceed the tolerance specified in 3.6.2.2.
17
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals