ACT THE-14, Руководство оператора

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Figure 3-3 Gain Control
3.6 Operation in conditions of blowing Dust or Sand:
CAUTION
OPERATION IN CONDITIONS OF BLOWING
DUST OR SAND CAN PIT AND SCRATCH
THE OPTICAL ELEMENTS AND DAMAGE
THE MECHANICAL COMPONENTS UNLESS
THE PRECAUTIONS GIVEN BELOW ARE
OBSERVED.
1. Ensure that the sacrificial window is in place.
2. Avoid pointing the monocular into the wind unless
necessary for operation.
3. Keep the carrying case closed unless removing or replacing
items.