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|  MIL-P-63332(AR)
4.6.11.15 Zero setting of diopter scale. A calibrated dioptometer shall
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be utilized for measuring the accuracy of zero diopter setting of the diopter
knob. Set the dioptometer diopter scale to zero, and adjust the dioptometer
eyepiece for best focus of the dioptometer reticle. Set the diopter knob of
the body assembly to indicate zero diopter. Position the dioptometer at the
eyepiece. While viewing through the dioptometer, obtain best focus of the
phosphor grain on the screen of the image tube by adjustment of the diopter
knob. The phosphor grain on the screen of the image tube shall be in best
focus within the tolerance specified in 3.11.9.7.1, as measured on the scale
of the diopter knob. Rotation of the diopter knob to measure the accuracy of
the zero setting of the diopter scale shall be made with backlash removed for
direction of travel.
4.6.11.16 Excursion range - diopter movement. Perform this test utiliz-
ing the dioptometer specified in 4.6.11.15. Position the periscope diopter
knob to the zero setting established in 4.6.10.4.15, with backlash removed for
direction of travel. Set the dioptometer diopter scale to -3.5 diopters and
add or subtract, as applicable, the zero setting value obtained in 4.6.11.15
to the -3.5 diopter, e.g.; should the zero diopter setting of the knob be
-0.25 the diopter diopter scale shall be set to -3.75 diopters; should the
zero diopter setting of the knob be +0.125 the dioptometer diopter scale she
be set to -3.375 diopters. With the dioptometer diopter scale set to the cal
culated minus diopter value, position the dioptometer at the eyepiece of the
periscope. While observing the screen of the image tube, through the diopto-
meter, slowly rotate the periscope diopter knob to its minus rotational stop.
At one position of the knob, during this rotation of the diopter knob through
the minus diopter adjustment range, the phosphor grain of the image tube shall
be in best focus. Reposition the diopter knob to its established zero setting
with backlash removed for direction of travel. Set the dioptaneter diopter
scale to the calculated plus diopter value, and position the dioptometer at
the eyepiece of the periscope. Measure the plus diopter movement excursion
range by using the above procedure. The excursion range of the diopter move-
ment shall conform to the requirements of 3.11.9.7.2.
4.6.11.17 Backlash - diopter movement. Perform this test utilizing the
dioptometer specified in 4.6.11.15. The diopter shall be zeroed and adjusted
as specified therein. Starting from the stop position, rotate the periscope
diopter knob clockwlse to the "O" position without reversing direction of
rotation. Position the dioptometer at the periscope eyepiece and obtain best
focus of the target image by adjustment of the dioptuneter diopter scale.
Record the dioptometer scale reading. Rotate the periscope diopter knob
clockwise to its stop position, then return it counterclockwise to the "O"
position without overtravel. Again obtain best focus of the target image by
adjustment of the dioptometer diopter scale. The difference between the first
and second dioptometer diopter scale readings shall not exceed the value
specified in 3.11.9.7.3.
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