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MIL-P-48571(MU) 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, in-
spection for dirt shall be made by viewing the illuminated field speci-
fied in  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  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 ad-
justed for best focus of the target image after the diopter adjustment knob
of the passive eyepiece is set for best focus of the phospher grain on the
screen of the image tube; Eccentric (for adjusting parallax) shall be ad-
justed for minimum parallax between the target image and reticle and then
locked after the diopter knob of the daylight eyepiece is set for best
focus of the periscope reticle; the sector lever of test fixture shall be
engaged in the zero degree elevation position on the index plate and the
10" collimator (8 field of view) shall be adjusted for 1200 meters.
Light assembly "K" shall be removed when performing tests for daylight sy-
stem. When performing tests for passive system, light assembly "K" shall
be utilized.  The image intensifier tube and reticle projector lamp shall
be permitted a 15 second stabilization period, prior to conducting the per-
formance tests. Electrical characteristics - passive. Image intensifier tube.- Apply 24 VDC 6 VDC to Contact
11733497 (Reference Drawing F11733401) and cycle the on-off switch from
off to on, by means of the shutter lever.  After allowing a 15 second tube
stabilization period, view through the passive eyepiece and observe the
image tube screen.  The screen surface of the image intensifier tube shall
be illuminated.  Upon satisfactory completion of the test, remove the 24 VDC
6 VDC from Connector 11733497 and apply 3 VDC 0.3 VDC Connector 11733493
(Reference Drawing 11733401).  Cycle the on-off switch from off to on. After
allowing a 15 second tube stabilization period, view through the elbow
assembly eyepiece.  The screen surface of the tube shall be illuminated to
determine overall compliance with
CAUTION:  When the on-off switch is in the "On" position and the input
voltage to the regulator is interrupted, the tube cannot be energized by
reapplication of the input voltage unless the on-off switch is cycled from
off to on. Image steadiness.- Perform this test with the reticle pro-
jector lamp off.  Position an observation telescope at the passive eyepiece
of the periscope.  The telescope shall contain a crossline reticle pattern
and be capable of focusing on the screen of the image tube. With the aid

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