Armasight NSGN150001F6DA1 N-15 FLAG Night Vision Goggles - Manual (Page 21)

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TABLE 3-1. N-15 CONTROLS AND INDICATORS
CONTROL/INDICATOR FUNCTION
Function Switch
(Figure 3-8, A) OFF position — the unit is off.
ON position — the unit is on (IT powered).
Turn the unit on by turning the switch from OFF to ON.
IR position — the unit is on, and the IR illuminator is activated.
Activate the IR illuminator by turning the switch from ON to the IR
position.
Eyepiece Ring
(Figure 3-8, B) Adjusts the unit diopter. The total dioptric range is covered in a 1/2
ring revolution.
Focusing Ring
(Figure 3-8, C) Focuses the lens. Adjusts for sharpest view of the scene. The total
focus range is covered in a 1/3 ring revolution.
Pivotal Focusing Lens
(Figure 3-8, D) Allows the user to choose between the following:
1. The IR illuminator spot beam. The pivotal focusing lens is placed
onto the IR illuminator output window.
2. The IR illuminator flood beam. The pivotal focusing lens does not
cover the IR illuminator output window.
Built-in LED Indicators A GREEN GLOW in the eyepiece viewing area indicates excessive
light conditions. After 10 sec of exposure to bright light, the intensi-
fier will shut off automatically. The unit will turn back on again when
moved away from the excessive light.
A PERMANENT RED GLOW in the eyepiece viewing area indicates
that the IR illuminator is operating.
A FLASHING RED LIGHT in the eyepiece viewing area indicates that
the battery is low.
3.3 OPERATING PROCEDURES
3.3.1 OPERATING PROCEDURES
These procedures should be performed under nighttime conditions only.
CAUTION:
Use of the N-15 in brightly lit conditions may damage the unit’s intensifier tube.
1. Verify that the battery is installed as indicated on the goggles body.
2. Make a visual estimation of the illumination level in the viewing area. The required level of illumina-
tion is less than 1 lx (late twilight sky conditions).
3. Remove the lens cap and place it over the housing of the lens.
CAUTION:
Before removing the objective lens cap, verify that the photoreceiver is open.