ATN PS-40 Operator's Manual page 60

Night vision front sights
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TUBE LENGTH
29.7 to 30.2
30.2 to 30.7
30.7 to 31.2
- If additional shims are necessary cut it from cardboard, texto-
lite or fiberglass plastic. The thickness of material is 0.5 mm.
- Put the shims on the bottom of the tube compartment.
C. Tube installation
- Thoroughly clean input and output windows of the tube.
- Apply small amount of sealant onto the internal surface of the
orienting sleeve (Figure D-1, 9).
- Place the orienting sleeve onto the front end of the tube. Be
sure to engage the sleeve pin (Figure D-1, 8) into the tube key.
- Insert the tube with the sleeve into the tube compartment. Be
sure to engage the sleeve lugs into the grooves on the tube
compartment.
- Apply small amount of thread locker and screw the locking ring
(Figure D-1, 7). Do not over tighten it.
- Install the objective lens, put the lens cap on.
- Screw the lock ring (Figure D-2, 2) and tight it lightly.
- Insert battery into the battery compartment, switch the sight on
and carry out operational checks. Switch the sight off.
- If the sight operates properly unscrew the lock ring, apply small
amount of thread locker, screw it and tight firmly.
CAUTION:
All testing and alignment procedures must be done in dark
room (illumination level less than 0.3 lx).
NOTE:
If special attenuator filter is used, testing and alignment pro-
cedure could be done in the normal illuminated room and the
collimator pattern illuminator could have only daytime mode.
D-4
TABLE D-2. ADjUSTING SHIMS
NUMBER OF SHIMS
3
2
1

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