Casio 2891 Operation Manual

MA0509-EA
Keep your watch exposed to light!
Your watch runs on electrical power generated from light and stored by a chargeable battery.
To ensure stable operation, make sure that the solar cell of the watch is exposed to light as much as possible.
1.
How the solar cell and battery work
When exposed to light
Light
Solar cell
Electrical
energy
Charge
Recharge-
able battery
Power supplied to watch
When not exposed to light
Discharge
Recharge-
able battery
Power supplied to watch
Your watch continues to operate, even when it is not exposed to
light. Leaving the watch in the dark can run down its battery and
cause functions to become disabled.
Using Your Watch for Mountain Climbing
. Before getting started...
Check changes in barometric pressure to get an idea of
what kind of weather to expect.
• See "Taking Pressure and Temperature Readings" for
more information.
Pressure Tendency Graph
Barometric
Pressure
Pressure
Differential
Graphic
Temperature
Pressure/Temperature Mode
Operation Guide 2891
2.
Avoid overuse of display illumination.
• Over use of display illumination can run down the battery.
Discharge
Recharge-
able battery
Power supplied to watch
The following shows approximately how much exposure to light is
required to recharge the battery by the amount used by one
display illumination operation.
• Sunlight through a window: 5 minutes
• Indoor fluorescent lighting: 50 minutes
Care is required when using the full auto light switch, which
can cause frequent display illumination.
. After you start climbing...
• Monitor the altitude on the display to
see how high you have climbed. You
can also record altitude records
(including date and time) in memory.
• See "Taking Altitude Readings" for
more information.
Altitude Graph
Altitude
Current Time
Altitude Mode
3.
Tips on how to keep the battery charged.
• Try to ensure that the watch is always exposed to enough light to
keep its battery indicator at LEVEL 1 or LEVEL 2. Some of the
watch's functions are disabled when battery power drops to
LEVEL 3.
Light
Battery Indicator
Recharge-
able battery
• Whenever you are not wearing the watch on your wrist, position it
so the face (solar cell) is pointed in the direction of a source of
bright light.
Solar Cell
Light
Leave the watch under
fluorescent lighting, near a
window, etc.
Your watch has a number of built in sensors that allow you to take direction, altitude, barometric pressure,
and temperature readings while mountain climbing or hiking.
• Use the digital compass to keep track
of your current bearing.
• See "Taking Direction Readings" for
more information.
Digital Compass
Altitude
Differential
Direction
Graphic
Angle
Current Time
Compass Mode
• When wearing the watch, try to keep your sleeve from blocking its
face (solar cell).
Level 1
All functions
enabled
Level 2
Some
Level 3
functions
Level 4
disabled
• You can also keep track of the current
barometric pressure and temperature
while climbing.
• See "Taking Pressure and
Temperature Readings" for more
information.
Pressure Tendency Graph
Barometric
Pressure
Temperature
Pressure/Temperature Mode
. After you get back home...
Recall altitude records from memory to retrace your climb
and to make plans for your next climb.
• See "Viewing Altitude Memory Records" for more
information.
Charging efficiency is significantly
reduced even if the face of the
watch is only partially covered by
your sleeve.
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