Radio Controlled Atomic Timekeeping - Casio 5087 Operation Manual

Operation Guide 5087
Warning!
Leaving the watch in bright light for charging can cause it to become quite hot.
Take care when handling the watch to avoid burn injury. The watch can become
particularly hot when exposed to the following conditions for long periods.
On the dashboard of a car parked in direct sunlight
Too close to an incandescent lamp
Under direct sunlight
Important!
Keep the watch in an area normally exposed to bright light when storing it for long
periods. This helps to ensure that power does not run down.
Storing the watch for long periods in an area where there is no light or wearing it in
such a way that it is blocked from exposure to light can cause power to run down.
Make sure that the watch is exposed to bright light whenever possible.
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Level Hand Movement
1 Normal.
x x Second Hand moving at two-second
2 intervals.
m m Day changes to 1 (home position).
x x Second Hand stopped.
z z Hour Hand and c c Minute Hand stopped
3
at 12 o'clock.
When power drops to Level 3, all functions will be disabled but the watch will
continue to keep time internally for about one week. If you recharge the battery
suffi ciently during this period, the analog hands will move automatically to the
correct setting and regular timekeeping will resume. After one week, all settings
(including timekeeping) will be cleared. Recharging the battery will reset all settings
to their initial factory defaults.
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Charging Times
Daily
Exposure Level (Brightness) Operation
Outdoor sunlight (50,000 lux) 8 minutes
Window sunlight (10,000 lux) 30 minutes
Window sunlight on cloudy day
48 minutes
(5,000 lux)
Indoor fl uorescent lighting (500 lux) 8 hours
* 1 Approximate exposure each day to generate power for normal daily operation.
* 2 Approximate exposure to take power up one level.
The above exposure times all are for reference only. Actual exposure times depend
on lighting conditions.
For details about the operating time and daily operating conditions, see the "Power
Supply" section of the Specifi cations (page E-73).
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To recover from the sleep state
Move the watch to a well-lit area or press any button.
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Important!
The areas covered by HNL (HONOLULU) and ANC (ANCHORAGE) are quite far
from the calibration signal transmitters, so certain conditions may cause reception
problems.
When HNL (HONOLULU) or HKG (HONG KONG) is selected as the Home City,
only the time and date are adjusted according to the time calibration signal. You
need to switch manually between standard time and daylight saving time (DST) if
required. See "To toggle the Home City time between standard time and daylight
saving time" (page E-35) for information about how to do this.
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Function Status
All functions enabled
Beeper and time calibration signal
reception disabled
All functions disabled
Level Change *2
Level 3 Level 2 Level 1
*1
2 hours 22 hours
6 hours 84 hours
8 hours – – –
91 hours – – –
Power Levels
You can get an idea of the watch's power level by
observing the movement of the x Second Hand in the
Timekeeping Mode.
If the x Second Hand is moving normally in one-second
intervals, power is at Level 1.
If the x Second Hand is moving at two-second intervals,
power is at Level 2, which is quite low. Expose the watch
to light as soon as possible so it can charge.
Moves at two-second
intervals.
Power Recovery Mode
The watch is designed to go into a power recovery mode that stops hand operation
temporarily whenever power suddenly drops below a certain level due to overuse
of the alarm tone over a short period. Note that all operations are disabled while the
watch is in the power recovery mode.
The hands will move to the correct positions and the watch will resume normal
operation after power recovers (in about 15 minutes). Putting the watch in a location
where it is exposed to light will help power to recover sooner.
Power Saving
Power Saving enters a sleep state automatically whenever the watch is left for a
certain period in an area where it is dark. The table below shows how watch functions
are affected by Power Saving.
There actually are two sleep state levels: "second hand sleep" and "function sleep".
Elapsed Time in Dark Operation
x x Second Hand only is stopped at 12 o'clock, all other
60 to 70 minutes (second hand
sleep) functions are enabled.
All functions, including analog timekeeping, disabled
6 or 7 days (function sleep)
Internal timekeeping maintained.
The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch
is already in a sleep state when 6:00 AM arrives, however, it will remain in the sleep
state.
The watch will not enter a sleep state while it is in the Stopwatch Mode.

Radio Controlled Atomic Timekeeping

This watch receives a time calibration signal and updates its time setting accordingly.
However, when using the watch outside of areas covered by time calibration signals,
you will have to adjust the settings manually as required. See "Confi guring Current
Time and Date Settings Manually" (page E-37) for more information.
This section explains how the watch updates its time settings when the city code
selected as the Home City is in Japan, North America, Europe, or China, and is one
that supports time calibration signal reception.
If your Home City Code setting is this:
LON (LONDON), PAR (PARIS), ATH (ATHENS) Anthorn (England), Mainfl ingen (Germany)
HKG (HONG KONG)
TYO (TOKYO)
HNL (HONOLULU), ANC (ANCHORAGE),
LAX (LOS ANGELES), DEN (DENVER),
CHI (CHICAGO), NYC (NEW YORK)
Approximate Reception Ranges
UK and German Signals
Anthorn
500 kilometers
1,500 kilometers
Mainfl ingen
The Anthorn signal is receivable
within this area.
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The watch can receive the signal from
the transmitter located here:
Shangqiu City (China)
Fukushima (Japan), Fukuoka/Saga (Japan)
Fort Collins, Colorado (United States)
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North American Signal
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
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