MIL-P-45651B(MU)
jective travel, parallax at the optical axis
change at the input coupling, excluding back-
shall not exceed 0.2 mil when viewing a
lash. shall cause the same angular change
in the line of sight within 0.2 mil, from
target at 500 meters to infinity.
18 degrees depression to 22 degrees eleva-
3.6.1 Parallax adjustment. The torque
tion.
required to rotate the parallax adjustment
-
3.8.3,1 Backlash. Backlash shall not ex-
screw shall not exceed 9 pound inches when
subjected to the temperatures specified in
ceed 0.05 mil.
3.4.2.,
3.8.4 Coupling travel. Rotation of the
elevation input coupling shall be limited only
3.7 Sealing. The periscope head and body.
by contact with the travel stop pin.
when tested separately, Shall show no evi-
dence of leakage when subjected to an in-
3.8.5 Torque. The running torque re-
ternal pressure of 5 pounds per square inch
quired to rotate the coupling through maxi-
gage (psig) for a period of 5 minutes. The
mum elevation and depression shall not
interior atmosphere of the accepted peri-
exceed 7 pound inches at a standard ambient
scope shall consist of dry nitrogen. The
o
temperature of 60 to 90° F. The torque shall
nitrogen shall have a dew point at least as
not change from the value obtained by more
o
low as --25 F,
than 3 pound inches when subjected to the
temperatures specified in 3.4.2 (see 6.3).
3.8 Head assembly. With datum plane X
in a vertical plane within 10 seconds, datum
3.8.6 Resolution. The resolving power on
plane Y in a horizontal plane within 10
the optical axis shall be 6 seconds of arc or
seconds, and side Y of the input coupling
less when viewing through the target view-
arm 8298397, referenced on Drawing
ing system (area C), and 45 seconds of arc
F8289173, positioned 67 degrees and 30 min-
0r less for the remaining area.
utes with the horizontal, the head assembly
3.9 Body assembly.
shall meet the requirements of 3.8.1 to
3.9.12.3 inclusive.
3.9.1 Collination.. The line of sight
through the boresight mark shall be perpen-
3.8.1 Collimation. An incident line of sight
dicular to datum plane X within 0.2 mil as
shall be perpendicular to datum plane X.
adjusted by the boresight knobs.
3.8.1.1 Light power system. The reflected
3.9.2 Elecration knob travel. The elevation
line of sight when measured in area C Shall
boresight knob shall provide a minimum
be perpendicular to datum plane Z within
travel of 5.5 mils in elevation and 8.5 mils
0.2 mil laterallv and 0.2 mil in elevation.
in depression from the collimation setting
of 3.9.1.
3. 8.1.2 Unity power system. The reflected
line of sight in the unity power viewing area
3.9.3 A zimuth knob travel. The azimuth
shall be laterally perpendicular to datum
boresight knob shall provicle a minimum
plane X within 15 minutes and shall be in a
travel of 7 mil in each direction from the
Plane depressed 20 degrees to the horizontal
collimation setting of 3.9.1.
within 15 minutes.
3.9.4 Reticle shift. Rotation of the bore-
3.8.2 Plumb travel. The line of sight shall
sight knobs shall not cause the reticle to
not deviate from a plumb line by more than
shift more than 0.2 mil in a direction perpen-
0.25 mil when e]evated 22 degrees and de-
dicular to the movement of the reticle cell.
pressed 18 degrees by means of the coupling,
3.9.5 Backlash. Backlash in each boresight
starting with the line of sight coincident
with the plumb line at the horizontal posi-
mechanism shall not exceed 0.05 mil.
tion.
3.9.6 Boresight knob disengagement. The
force required to disengage the boresight
3.8.3 Elevation accuracy. Each angular
3
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business