Operation Guide 5178
Radio-controlled Atomic Timekeeping Precautions
•Strong electrostatic charge can result in the wrong time being set.
•The time calibration signal bounces off the ionosphere. Because of this, such factors as changes in the reflectivity of the ionosphere, as well as movement of the ionosphere to higher altitudes due to seasonal atmospheric changes or the time of day may change the reception range of the signal and make reception temporarily impossible.
•Even if the time calibration signal is received properly, certain conditions can cause the time setting to be off by up to one second.
•The current time setting in accordance with the time calibration signal takes priority over any time settings you make manually.
•The watch is designed to update the date and day of the week automatically for the period January 1, 2000 to December 31, 2099. Setting of the date by the time calibration signal will not be performed starting from January 1, 2100.
•This watch can receive signals that differentiate between leap years and
•If you are in an area where proper time calibration signal reception is impossible, the watch keeps time with the precision noted in “Specifications”.
Timekeeping
•The year can be set in the range of 2000 to 2099.
•The watch’s
•The date will change automatically when the current time reaches midnight. The date change at the end of the month may take more time than normal.
•The current time for all time zones in the Timekeeping Mode and World Time Mode is calculated in accordance with the Coordinated Universal Time (UTC) offset of each zone, based on your Home Time Zone time setting.
•UTC is the
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”.
To recover from the sleep state
Perform any one of the following operations.
•Move the watch to a
•Press any button.
Elapsed Time in Dark | Operation |
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60 to 70 minutes | Second hand only is stopped, all other functions are |
(second hand sleep) | enabled. |
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6 or 7 days | • All functions, including analog timekeeping, disabled |
(function sleep) | • Internal timekeeping maintained |
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•Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
•The watch will not enter the sleep state between 6:00 AM and 9:59 PM. If the watch is already in the sleep state when 6:00 AM arrives, however, it will remain in the sleep state.
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Specifications
Accuracy at normal temperature: ± 15 seconds a month (with no signal calibration)
Timekeeping: Hour, minutes (hand moves every 10 seconds), seconds,
Calendar system: Full
Other: Home City code (can be assigned one of 29 city codes and Universal Coordinated Time); Daylight Saving Time (summer time) / Standard Time
Time Calibration Signal Reception: Auto receive up to six times a day (5 times a day for the Chinese calibration signal) (Remaining auto receives cancelled as soon as one is successful); Manual receive
Receivable Time Calibration Signals:
Mainflingen, Germany (Call Sign: DCF77, Frequency: 77.5 kHz); Anthorn,
England (Call Sign: MSF, Frequency: 60.0 kHz); Fukushima, Japan (Call
Sign: JJY, Frequency: 40.0 kHz); Fukuoka/Saga, Japan (Call Sign: JJY,
Frequency: 60.0 kHz); Fort Collins, Colorado, the United States (Call
Sign: WWVB, Frequency: 60.0 kHz); Shangqiu City, Henan Province,
China (Call Sign: BPC, Frequency: 68.5 kHz)
Stopwatch: Measuring capacity: 23:59'59.95'' Measuring unit: 1/20 second Measuring mode: Elapsed time, split time
World Time: 29 time zones (29 cities + coordinated universal time)
Other: Standard Time/Daylight Saving Time (summer time); Home City/World Time City swapping
Other: Power Saving, auto hand home position correction
Power Supply: Solar cell and one rechargeable battery
Approximate battery operating time: 5 months (no exposure to light; one signal reception of approximately 4 minutes per day)
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City Code Table
City | City | UTC Offset/ | |
Code |
| GMT Differential | |
PPG | Pago Pago | ||
HNL | Honolulu | ||
ANC | Anchorage | ||
LAX | Los Angeles | ||
DEN | Denver | ||
CHI | Chicago | ||
NYC | New York | ||
SCL | Santiago | ||
RIO | Rio De Janeiro | ||
FEN | Fernando de Noronha | ||
RAI | Praia | ||
UTC |
| 0 | |
LON | London | ||
| |||
PAR | Paris | +1 | |
ATH | Athens | +2 |
City | City | UTC Offset/ |
Code |
| GMT Differential |
JED | Jeddah | +3 |
THR | Tehran | +3.5 |
DXB | Dubai | +4 |
KBL | Kabul | +4.5 |
KHI | Karachi | +5 |
DEL | Delhi | +5.5 |
DAC | Dhaka | +6 |
RGN | Yangon | +6.5 |
BKK | Bangkok | +7 |
HKG | Hong Kong | +8 |
TYO | Tokyo | +9 |
ADL | Adelaide | +9.5 |
SYD | Sydney | +10 |
NOU | Noumea | +11 |
WLG | Wellington | +12 |
•Based on data as of December 2010.
•The rules governing global times (UTC offset and GMT differential) and summer time are determined by each individual country.
L |