MIL-P-50307 (MU)
4.6.6.2 Projected reticle Pattern definition.- In a darkened area -
as specified in 4.6.5.4 - adjust the light intensity control to obtain
optimum viewing of the projected reticle pattern image, and conduct an
examination
to determine that its pattern is without breaks and clearly
defined.
After a lapse of 15 minutes - a light adaption period - employ
a uniformly illuminated field of view of at least 2300 foot lamberts.
The light intensity control shall now be adjusted to determine that a
position exists where the projected reticle-pattern image is clearly visi-
ble.
4.6.6.3
Adjust the light
Projected reticle pattern accuracy.-
intensity control for optimum viewing and establish coincidence between
the intersection of the horizontal and vertical lines on the target and
t h o s e o f t h e p r o j e c t o r ' s r e t i c l e i m a g e . E x a m i n e the
entire circumference
of the projector's 30 mil circle to determine that it is within the 29 mil
end 31 mil concentric target circles.
4 . 6 . 6 . 4 P a r a l l a x . - The observer shall locate his eye eight to ten
inches from the beamsplitter at the Line W axis established in 4.6.6 and
adjust the light i n t e n s i t y control for optimum viewing. Align both the
vertical and horizontal reticle line of the projected reticle image close
to but not touching the vertical and horizontal lines on the targets - lo-
cated at an actual or simulated distance of both 500 and 1000 meters. The
observer shall slowly move his head up and down and from right to left -
lines. The observer
observing both target lines and both r e t i c l e
shall 1 verify by this examination that no line displacement occurs in ex-
c e s s of t h e
l i m i t specified over the full aperture of the beamsplitter
when viewing actual or simulated 1000 + 200 meter target.
4.6.6.5 Image tilt.- Perform this test with a target line that is
plumb, aligned' with the vertical longitudinal plane containing the Line W
a x i s established in 4 . 6 . 6 ,
and with one extremity of t h e p r o j e c t o r ' s r e t i c l e
i m a g e v e r t i c a l l i n e i n c o i n c i d e n c e w i t h t h e t a r g e t ' s plumb line - at the
bottom of the 31 mil circle. The other extremity of the projector's reticle
image vertical line shall now be observed at the top of the 31 mil circle
t o verify that it is not displaced more than 0 . 4
m i l from the plumb target
line.
4.6.6.6
Optical-mechanical alignment retention.- This test consists
of repeating 4.6.6.1:
(a) subsequent to vibration tests in 4.6.4, (b) UPOn
elevating and depressing the projector (in accordance with the procedure
specified herein) and (c) after completion of each one of each three cycles
of t h e
handling cycles specified herein.
The recorded data in 4.6.6.1 shall
be utilized to v e r i f y c o m p l i a n c e w i t h 3 . 7 . 1 a n d 3 . 7 . 3 . E l e v a t i o n a n d d e -
I
pression of the projector shall consist of rotating the projector's axis
(represented by line D in Figure 1) - i n a v e r t i c a l l o n g i t u d i n a l p l a n e 1 7 7
mils from a plumb line toward the observer and then 408 roils from a plumb
l i n e a w a y f r o m t h e o b s e r v e r a b o u t a n a x i s w h i c h i s 9 0 ° to
l i n e D,
parallel
t o l i n e A ( F i g u r e 1 ) , and in the same horizontal longitudinal p l a n e
as
A . T h i s rotation will elevate and depress the beamsplitter, during
15
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