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MIL-P-48619(AR)
the image tube, rotate the focusing ring of the elbow assembly for
best focus of target image to determine compliance with 3.8.7.2.
Upon satisfactory completion of this portion of the test, the 10"
collimator shall readjusted for infinity to determine compliance
with the 3000 meters specified in 3.8.7.2.  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
3.8.7.2.
4.6.6.8 Resolution - daylight. -The daylight optical system of
the periscope shall be inspected for resolution utilizing a
calibrated dioptometer 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 periscope 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
resolution pattern appearing in the fourth quadrant of the target
reticle located in the 10" Collimator (Ref. Dwg. 11738140 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 3.8.8.1.
4.6.6.9 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. 11738140 Test Set-Up Periscope), shall be obtained by
adjusting the passive eyepiece 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 readings for the meridians shall not exceed
the value specified in 3.8.8.2.
4.6.7.
Interchangeability.
4.6.7.1.  Modules. -Each sample periscope (see 4.4.2) shall be
disassembled (removal of passive elbow from head and daylight body
from head) to permit interchange of the component modules. The
modules shall be identified and interchanged as shown in Table VI.
32

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