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MIL-P-48450A(MU)
of an appropriate stand, a supporting medium capable of receiving the dial
indicator as well as the body assembly to be tested and the screw driver
specified in 4.6.4.2.1 shall be utilized for this test.  With the daylight
body removed from the periscope and firmly secured on the supporting
medium, position the dial indicator so that its contact point touches the
face of the movable objective tube of the daylight body and set the dial to
read zero with the indicating hand.  Back off the locking screw of Clamp
10516556 a minimum of two full revolutions from its locked position.
Starting from the zero reading of the dial indicator, rotate the eccentric
until the objective assembly has traveled the minimum distance specified in
3.6.7..1, as measured on the dial indicator.  Return the indicating hand of
the dial indicator to zero by means of the eccentric and repeat this travel
in the opposite direction.  There shall be sufficient travel in each
direction to meet the minimum requirements specified in 3.6.7.1, as
measured on the dial indicator.  Upon completion of this test, reinstall
the daylight body in periscope and repeat the parallax adjustment procedure
specified in 4.6.4.2.1.  The daylight body shall then be subjected to
the test in 4.6.2.8.
4.6.4.7.2 Passive.- This portion of the test shall be performed
with the 10" collimator adjusted for 50 meters.  With the diopter ring
adjusted for best focus of the phosphor grain on the screen of the image
tube, rotate focusing ring of the elbow assembly for best focus of target
image to determine compliance with 3.6.7.2.  Upon satisfactory completion
of this portion of the test, the 10" collimator shall be readjusted for
infinity to determine compliance with the 3,000 meters specified in
3.6.7.2.  With the diopter ring adjusted for best focus of the phosphor
grain on the screen of the image tube, again rotate the focusing ring of
the elbow assembly for best focus of the target image to determine overall
compliance with 3.6.7.2.
4.6.4.8 Resolution - daylight.- The daylight optical system of the
periscope shall be inspected for resolution utilizing a calibrated diop-
tometer with a magnification of at least three power.  Set the dioptometer
objective scale to zero and adjust the dioptometer eyepiece for best focus
of the dioptometer reticle.  Set the diopter adjustment knob of the peri-
scope daylight eyepiece to indicate zero diopter.  Position the dioptometer
at the periscope daylight eyepiece. While viewing through the dioptometer,
adjust the objective scale of the dioptometer for best focus of the resolu-
tion pattern appearing in the fourth quadrant of the target reticle located
in the 10" Collimator (Ref. Dwg. F11738140 Test Set-up, Periscope). Any
change in diopter readings by adjustment of the dioptometer objective scale
to obtain the detectable line structure and proper line count in all four
meridians shall be recorded, as measured on the dioptometer objective scale.
The difference between the recorded readings for any two meridians shall not
exceed the value specified in 3.6.8.1.
4.6.4.9 Resolution - passive.- This test shall be performed while
viewing through the passive eyepiece with the unaided eye.  Best focus of
both meridians of resolution pattern appearing in the first quadrant of
the target reticle located in the 10" Collimator (Ref. Dwg. F11738140
Test Set-Up Periscope), shall be obtained by adjusting the passive eyepiece's
diopter ring.  Any change in the diopter readings by adjustment of the
passive eyepiece diopter ring to obtain the detectable line structure and
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