Armasight NSMSIRIUS1GMDA1 Sirius GEN 3 Ghost MG Multi-Purpose Night Vision Monocular - Manual (Page 29)

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CAUTION:
Bright sources such as firelight, headlights, searchlights, etc. can damage the Sirius. Avoid ex-
posing the unit to these types of light sources.
3.3.2 IR ILLUMINATOR OPERATIONS
CAUTION:
When operating the device in extremely dark conditions, the light from the unit’s IR illuminator
will be invisible to the unaided eye. However, the light can be detected by other NVDs.
NOTE:
The IR illuminator is designed to provide additional illumination (when needed) while viewing
scenes or targets from a short distance (up to 3m).
1. To activate the IR illuminator, turn the monocular on. Pull the IR illuminator out and flip the turn-pull
function switch (A) CW from ON to the IR position. A red light will appear in the eyepiece to indicate
that the IR illuminator is operating.
2. Focus the IR light, if necessary, by placing the pivotal focusing lens (B) onto the IR illuminator output
window (C).
FIGURE 3-15. IR ILLUMINATOR OPERATIONS
B
A
C
3.3.3 OPERATING UNDER CHANGING LIGHT CONDITIONS
If the ambient light level exceeds the limit of 100-300 lx for more than 10 s, the Sirius automatic protec-
tive system will shut off the intensifier tube. If a mission must be carried out in changing light condi-
tions, the user can shut down the protective system manually by closing the photoreceiver (A) with the
pivotal focusing lens.
CAUTION:
DO NOT forget to open the photoreceiver after completing your mission.