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2. PRECAUTIONS
Vertical and horizontal clamps
• Always fully release the vertical/horizontal clamps when rotating the instrument or telescope. Rotating with
clamp(s) partially applied may adversely affect accuracy.
Tribrach
• Always use the tribrach provided. During a traverse observation, it is recommended to use the same type of
tribrach for the target as well for accurate observations.
Backing up data
• Data should be backed up (transferred to an external device etc.) on a regular basis to prevent data loss.
Use under low temperatures (Low Temperature Model only)
• Do not use force to scrape off frost from the lens or display unit screen. Frost is an abrasive material and may
scratch the instrument.
• If ice or snow attaches itself to the unit, wipe it off with a soft cloth, or place the unit in a warm room until the
ice melts, and then wipe off the meltwater. Operating the unit with ice or snow attached may cause operation
errors to occur.
• Wipe off condensation with a soft cloth before using the instrument. Not doing so may cause operation errors
to occur.
• When using the instrument in low temperatures around -35°C (-31°F), we recommend that you use an
external battery (optional accessories).
Low temperature will affect the performance of the battery BDC70 (working duration will rapidly decline for
example).
However, if you unavoidably must use the battery BDC70 for measurements in temperatures around -35°C
(-31°F), recharge the battery in a warm room and keep the battery in a warm place such as your pocket until
it is used.
• The lens cap and lens hood may become difficult to attach in low temperatures. Keep them in a warm place
such as a pocket until attached.
• If the unit is carried between locations that have extreme temperature differences, protect the unit from rapid
temperature change by placing it in the carrying case.
• Please use the tribrach supplied as standard. If a different tribrach is used, angle measurement errors may
occur.
Other precautions
• Close the external interface hatch before starting measurement. Otherwise, ambient light entering the USB
port may adversely affect measurement results.
• If the iM is moved from a warm place to an extremely cold place, internal parts may contract and make the
keys difficult to operate. This is caused by cold air trapped inside the hermetically sealed casing. If the keys
do not depress, open the battery cover to resume normal functionality. To prevent the keys from becoming
stiff, remove the connector caps before moving the iM to a cold place.
• Never place the instrument directly on the ground. Sand or dust may cause damage to the screw holes or the
centering screw on the base plate.
• Do not aim the telescope directly at the sun. Also, attach the lens cap to the telescope when not in use. Use
the Solar filter to avoid causing internal damage to the instrument when observing the sun.
• Do not perform vertical rotation of the telescope when using the lens hood, diagonal eyepiece, or solar filter.
Such accessories may strike the instrument causing damage.
• Protect the instrument from heavy shocks or vibration.
• Never carry the instrument on the tripod to another site.
• Turn the power off before removing the battery.
• When placing the iM in its case, first remove its battery and place it in the case in accordance with the layout
plan.
• Make sure that the instrument and the protective lining of the carrying case are dry before closing the case.
The case is hermetically sealed and if moisture is trapped inside, the instrument
could rust.