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|  MIL-P-48451A (MU)
grain on the screen of the image tube; the diopter adjustment knob of
the daylight eyepiece shall be set for best focus of the periscope re-
ticle: the sector lever of test fixture shall be engaged in the zero de-
gree 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 system. When performing tests
for passive system, light assembly "K" shall be utilized. The image in-
tensifier tube and reticle projector lamp shall be permitted a 15 second
stabilization period, prior to conducting the-performance tests.
4.6.6.1 Electrical characteristics- passive.
.
4.6.6.1.1 Image intensifier tube.- Apply 24VDC 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 O.3 VDC to
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 3.8.9.1.
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.
4.6.6.1.2 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
of the telescope, view through the passive eyepiece and establish the tele-
scope reticle crosslines coincident to the projected target image cross-
lines. Observe the target image for a time period of not less than one
minute. During this one minute time period there shall be no visible
flicker, no movement of the image nor audible sparking as specified in
3.8.9.2. Image movement shall be determined by means of the target image
with respect to the observation telescope reticle pattern. Sparking shall
be determined by means of an audio examination. Upon completion of this
test, energize the reticle projector lamp.
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 (reference Drawing F11733401) and the image intensi-
fier tube energized, rotate the reticle brightness control knob MS 91528-
OE1B to the off position. Then while viewing through the elbow assembly
eyepiece, rotate the control knob clockwise throughout its range of move-
ment. 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.
17
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