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Objective focusing range - passive |
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|  MIL-P-48451A(MU)
4.6.6.6 Parallelism of reticle and image-daylight and passive.- Per-
form this test while viewing through the passive eyepiece of the periscope
with the unaided eye. Position one extremity of the periscope horizontal
reticle line coincident to the horizontal target image line. The periscope
horizontal reticle line shall be parallel to the horizontal target line
within the tolerance specified in 3.8.6, as determined by the tolerance
gates provided on the target. The above procedure shall also be repeated
at the daylight eyepiece of the periscope in compliance with 3.8.6.
4.6.6.7 Objective focusing range - passive.- This portion of the
test shall be performed with the 10" collimator (Ref. Dwg. F11746743 Final
Acceptance Test Equipment and Arrangement Drawing) 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 beet focus of target image to determine compliance with 3.8.7. 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 3.8.7. 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 3.8.7.
4.6.6.8 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. FH746743 Final acceptance Test Equipment
and Arrangement Drawing)." 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 3.8.8.1.
4.6.6.9 Resolution-passive.- This test shall be performed while
viewing through the passive evepiece 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. F11746743 Final
Acceptance Test Equipment and Arrangement Drawing), 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 proper line count in each meridian shall be
recorded, as measured on the ring scale. The difference between the read-
ings for the meridians shall not exceed the value specified in 3.8.8.2.
4.6.7 Interchangeability.
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