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9
7. STORAGE AND MAINTENANCE
Warning
If NVS 22-2XT has been kept for a long time at temperature lower than -
40°C (-40°F), then prior to using the device must be warmed up at an
ambient temperature of -10°C (14°F) to +40°C (104°F) with relative
humidity below 80%.
NVS 22-2XT is a sophisticated precise optical instrument equipped with
electronics. It should be handled with due care:
• Unit contains fragile components and sensitive optics. Avoid impacts,
dust, moisture and sharp changes of temperature.
• Do not touch the optical surfaces other than for cleaning. Doing so
may damage the anti-reflection coating.
• Clean optical surfaces with professional lens cleaning supplies.
• Use only soft clean cloth to clean the exterior of the device.
• Keep away from sources of heat, such as heating appliances, sunlight
or central heating. Do not keep the device at temperatures higher than
60
o
C (140
o
F).
• Switch off the unit and remove the batteries during the extended
periods of non-operation.
• Do not apply excessive force or pressure to the lens assembly, this
may damage fragile elements and thread connections.
• Small dark and/or white marks may be seen in the field of view. This
does not affect the operational capabilities of the device.
• Do not remove the cover from the lens other than for night-time
operation.