Technical data

3.4.5. IR SOURCE OPERATIONS

WARNING:

The IR source is invisible to the naked eye, and is intended for use in extremely dark conditions.

However, this light can be detected by other night vision devices.

NOTE:

The IR source is intended for viewing at close distances (up to 3 meters) when additional il-

lumination is needed.

(1) Pull the power switch knob out and rotate it clockwise to the IR position. With the monocular held to

the eye, verify that a red light appears in the eyepiece. This indicates that the IR source is operating.

(2) For momentary IR operation, turn the power switch clockwise (without pulling) past the ON posi-

tion. Observe that a red light appears in the eyepiece.

3.4.6. OPERATION WITH A COMPASS

WARNING:

The compass illuminator can be seen by others using night vision devices.

CAUTION:

You will get inaccurate readings, when using the compass on any head or helmet mount with

the magnet still installed. Only the magnet on the metal mount can be removed without caus-

ing damage to the equipment (see paragraph 3.3.11).

NOTE:

• The compass reading is magnetic North, not true North.

• The compass reading is within 2° of correct absolute magnetic bearing. Compass readings

with the mounted monocular (head mount or helmet mount) can be up to 15° of correct abso-

lute magnetic bearing. This occurs mostly in the East (90°) to West (270°) and less in the North

(360°) to South (180°) reading. If the compass is inadvertently magnetized, this could cause an

additional 15° error.

• The objective lens focus can be ne-tuned after installation, but in order to obtain an accurate

reading, the compass must be vertical. (The compass image must be level.)

(1) Install per paragraph 3.3.11.

(2) To view a distant object more clearly, adjust the objective lens focus by gripping the compass and

turning it clockwise.

NOTE:

• Increase brightness slowly. Excessive brightness may burn a temporary image into the image

intensier. Do not increase brightness any more than is necessary to clearly read the compass

heading.

• The monocular must be focused at or near innity for proper compass operation.

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