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|  MIL-P-48619(AR)
4.6.5.1 Body assembly (daylight). -The optical surfaces of the
body assembly shall be visually examined with the unaided eye.
While viewing through each end of the module, inspection for defects
shall be made by the technique of shadowing. While viewing through
the eyepiece, inspection for dirt shall be made by viewing a
uniformly illuminated field having a brightness of approximately 300
apparent foot condles. The body assembly (daylight) shall conform
to the requirements of 3.7a and 3.7b(1).
4.6.5.2 Elbow assembly (passive). -The image intensifier tube
shall be de-energized for this portion of the test. With a light
source held close to the objective window and the eyelens, view
through the glass components of the elbow assembly to determine
compliance with the cleanliness requirements of 3.7a. Upon success-
ful completion of this portion of the test, energize the image
intensifier tube from a power source capable of supplying and
maintaining 24 volts DC. The image tube shall be permitted a
stabilization period of 15 seconds prior to performing the cleanli-
ness test. Subsequent to the tube stabilization period, obtain best
focus of the phosphor grain on the screen of the image tube by
adjustment of the eyepiece diopter ring. The screen surface of the
image tube shall then be visually inspected for cleanliness in
accordance with 3.7b(2) and shall conform to the requirements
specified therein. "Cold" and "Hot" spots On the screen surface of
the image tube shall not be considered dirt.
4.6.5.3 Head assembly. -The optical surfaces of the head
assembly shall be inspected for cleanliness with the unaided eye.
While viewing through each end of the module, inspection for defects
shall be made by the technique of shadowing. While viewing through
the exit window, inspection for dirt shall be made by viewing the
illuminated field specified in 4.6.5.1. The head assembly shall
conform to the requirements of 3.7a and 3.7b(3).
4.6.6 Performance. -To determine compliance with 3.8, the
following tests shall be performed with the complete periscope
positioned on the special test equipment specified in 4.5.2.3.1.
Unless otherwise specified during these tests, the image intensifier
tube and the reticle projector lamp shall be energized; the passive
Focusing Ring 11733436 shall be adjusted for best focus of the
target image after the diopter adjustment knob of the eyepiece is
set for best focus of the phospher grain on the screen of the image
tube; Eccentric (for adjusting parallax) shall be adjusted for
minimum parallax between the target image and reticle and then
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