Manual

17
2.3 PRINCIPLES OF OPERATION
2.3.1. MECHANICAL FUNCTIONS
The mechanical functions of the NVMPS allow for dierences in the physical features of individual op-
erators and provide for operating the system. These functions include the power switch, eye relief ad-
justment, diopter adjustment, gain control, and objective focus. The mechanical controls are identied
in Figure 2-5.
NOTE:
The gain control is not present in 6015 or PVS-14NG model.
2.3.2 OPTICAL FUNCTIONS
The optical functions include an objective lens, image intensier and eyepiece lens (Figure 2-6). The ob-
jective lens collects light reected from the night scene by the moon, stars, or night sky, inverts the im-
age and focuses that image on the image intensier. The image intensier converts the captured light
into a visible image and reinverts the image which can then be viewed through the eyepiece lens.
OBJECTIVE
FOCUS
DIOPTER
ADJUSTMENT
POWER
SWITCH
GAIN
CONTROL
EYE RELIEF
ADJUSTMENT
HIGH LIGHT CUT-OFF WINDOW
IR LENS
LATCH
Figure 2-5. Mechanical Functions for the NVMPS
PHOTOCATHODE
MICROCHANNEL
PLATE
FIBER-OPTIC
INVERTER
OBJECTIVE
LENS
PHOSPHOR
SCREEN
IMAGE
INTENSIFIER
POWER
SUPPLY
EYEPIECE
LENS
EYE
Figure 2-6. Optical Function Diagram