ATN PVS-7 Operator's Manual page 37

4. press the compass assembly onto the objective lens at an angle
using your left hand. Slowly turn the compass assembly counter-
clockwise until it is in the vertical position (with compass illumina-
tion button pointing down). See Figure 2-3.
5. ensure that the compass fits tightly to the pVS-7.
NOTE
The o-ring must be in place in the compass assembly in order for
the compass to fit properly.
6. refer to paragraph 2-6, F for operation of the compass.
G. Installation of the Light Interference Filter. perform the fol-
lowing procedure to install the light interference filter (lIF) onto the
objective lens assembly.
Figure 2-5. Installation of the Light Interference Filter
1. remove the container/wrench from the carrying case pouch.).
2. If the lens cap, compass assembly, or sacrificial window is on the
objective lens of the pVS-7, remove it.
3. Carefully open the container/wrench and remove the lIF.
4. Hold the lIF by the notched end and thread it clockwise into the
end of the objective lens (see Figure 2-5).
5. Using the ridged side of the container/wrench as a wrench, en-
gage the ridges on the container with the ridges on the lIF and
tighten the lIF hand tight.
6. place the empty container/wrench back into the pouch in the car-
rying case.
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