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|  MIL-P-48619(AR)
4.6.6.1.3 Reticle brightness. -Perform this test concurrent with
the test in 4.6.6.1.1. With each voltage specified in 3.8.9.3
applied to Contact 11733497 (Ref. Dwg. 11733401) and the image
intensifier tube energized, rotate the reticle brightness control
knob MS91528-OE1B to the off position. Then while viewing through
the elbow assembly eyepiece, rotate the control knob clockwise
throughout its range of movement. During this clockwise rotation of
the control knob, the reticle brightness shall be adjustable from
off to full bright and the reticle markings shall appear clearly
defined at each voltage setting when observed through the elbow
assembly eyepiece to determine compliance with 3.8.9.3.
4.6.6.1.4 On-off switch. -This test may be performed at the same
time the test of 4.6.6.1.1 is performed. With the voltage specified
in 4.6.6.1.1 applied to Contact 11733497, view through the elbow
assembly eyepiece and observe the illuminated screen surface of the
tube. Then while the on-off switch is in the on position, remove
the voltage from the contact and reapply. During the above obser-
vation, the screen surface of the tube shall shut off when voltage
is removed and shall not illuminate by reapplication of the voltage
unless the on-off switch is recycled from off to on-to be in con-
formance with 3.8.9.4.
4.6;6.2 Parallax. -View through the daylight eyepiece and
establish coincidence of the periscope reticle boresight cross and
the projected target image crosslines by means of the-boresight
knobs. While viewing through the eyepiece, parallax will be recog-
nized by an apparent displacement of the intersecting point of the
periscope reticle boresight cross with respect to the intersecting
point of the projected target image crosslines when the observer's
head is moved from side to side or up and down. Displacement
between the periscope reticle and target image shall not exceed the
tolerance specified in 3.8.2. Upon satisfactory completion of this
test, perform the tests specified in 4.6.6.7.1 and 4.6.2.8.
4.6.6.2.1 Parallax adjustment. -If adjustment is necessary, a
standard type screw driver that properly fits the screw slot of the
locking screw and eccentric shall be utilized for performing this
adjustment. The locking screw of Housing 11727432 shall be backed
off a minimum of two revolutions from its locked position. Then
while performing the test in 4.6.6.2, rotate the eccentric clockwise
or counterclockwise until the parallax requirement specified therein
has been met. When the adjustment is complete, apply the applicable
torque value specified in 3.5.8 to the locking screw utilizing the
torque wrench specified in 4.6.2.8.
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