2.3 OPERATION PRINCIPLES
2.3.1 MECHANICAL FUNCTIONS
Mechanical adjustments of the PVS-7 allow for physical dierences between individual operators us-
ing the system. The goggles’ functions include the power switch, interpupillary adjustment, release
latch, eye relief adjustment, diopter adjustment, IR spot/ ood focus (optional), compass illumination
(optional), and objective lens focus. The mechanical controls are identied in Figure 2-2.
2.1.2 OPTICAL AND ELECTRICAL FUNCTIONS
The optical functions include an objective lens, image intensier, a collimator lens, and two eyepieces.
The objective lens collects light reected from the moon, stars or other ambient light in the night
sky, and inverts and focuses an image of the scene onto the image intensier. The electrical functions
include the following:
A. Power Source. The electronic circuit is powered by replaceable batteries - either a 3.0 Volt lithium
battery (BA-5567/U) or two AA 1.5 Volt alkaline batteries (BA-3O5S/U).
B. Electrical Principles. Power from the batteries is supplied to the components through the RESET/
OFF-ON-IR/ PULL switch as follows:
RESET/ OFF Position. With the switch in the OFF position, the circuit will not supply energy to the image
intensier or the IR illuminator. You can also turn the switch to this position to reset your device after
automatic shuto or bright light cuto.
ON Position. Energy is drawn from the battery compartment to power the goggles. When the voltage
drops to 2.4 VDC, a low battery indicator will begin to blink on the right side region of the eyepiece,
indicating approximately 30 minutes of remaining operating time.
IR/ PULL Position. Energy is drawn from the battery compartment to power the goggles and IR light
source, and a steady red indicator light will appear in the left side region of the eyepiece. The IR can be
momentarily turned on by turning the switch ON without pulling the knob.
InterpupIllary adj.
eye
relIef
dIopter
adj. rIng
latch
reSet/off-on-Ir/
pull SwIth Knob
Ir Spot/flood focuS Knob
compaSS
IllumInatIon
button
(underneath)
objectIve
lenS focuS
Knob
lenS cap
FIGURE 22. MECHANICAL CONTROLS FOR PVS7
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