Operation Guide 5251 (OC)
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 Time and Date Settings Manually” (page
This section explains how the watch updates its time settings when the city name selected as the current location is in Japan or China, and is one that supports time calibration signal reception.
If your location setting is this: | The watch can receive the signal from the transmitter located here: |
CN (HKG, HONG KONG) | Shangqiu City (China) |
JP (TYO, TOKYO) | Fukushima (Japan), Fukuoka/Saga (Japan) |
OFF | No signal received |
Approximate Reception Ranges
Japanese Signal | Chinese Signal | ||
500 kilometers | Fukushima | 500 kilometers | Changchun |
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| Beijing |
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| Shangqiu |
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| Shanghai |
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| Chengdu |
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| Hong Kong |
1,000 kilometers | 1,500 kilometers |
Fukuoka/Saga |
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ξEven when the watch is within range of a transmitter, signal reception may be impossible due to the effects of geographic contours, structures, weather, the time of year, the time of day, radio interference, etc. The signal becomes weaker at distances of approximately 500 kilometers, which means that the influence of the above conditions becomes even greater.
ξSignal reception may not be possible at the distances noted below during certain times of the year or day. Radio interference may also cause problems with reception.
−Fukushima or Fukuoka/Saga (Japan) transmitter: 500 kilometers (310 miles)
−Shangqiu (China) transmitter: 500 kilometers (310 miles)
ξAs of December 2010, China does not use Daylight Saving Time (DST). If China does go to the Daylight Saving Time system in the future, some functions of this watch may no longer operate correctly.
ξUsing this watch in a country covered by a time calibration that is different from the countries it supports may result in incorrect time indication due to local application of summer time, etc.
To get ready for a receive operation
1.Place the watch in a location where signal reception is good.
ξPosition the watch as shown in the nearby illustration, with the part of the dial between 7 and 8 o’clock pointed towards a window. Make sure there are no metal objects nearby.
ξ Signal reception normally is better at night.
ξ The receive operation takes from three to eight minutes, but in some cases it can take as long as 18 minutes. Take care that you do not perform any button operation or move the watch during this time.
ξSignal reception may be difficult or even impossible under the conditions described below.
Inside or among Inside a vehicle | Near household | Near a | Near high- | Among |
buildings | appliances, | construction | tension power | or behind |
| office | site, airport, or | lines | mountains |
| equipment, or a | other sources of |
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| mobile phone | electrical noise |
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2.What you should do next depends on whether you are using Auto Receive or Manual Receive.
ξAuto Receive: Leave the watch over night in the location you selected in step 1. See “Auto Receive” below for details.
ξManual Receive: Perform the operation under “To perform manual receive” on page
Auto Receive
ξWith Auto Receive, the watch performs the receive operation each day automatically. Reception times depend on the location settings: 2:00, 3:00, and 4:00 a.m. for JP (TYO, TOKYO), and 1:00, 2:00, and 3:00 a.m. for CN (HKG, HONG KONG). When any receive operation is successful, none of the other receive operations for that day are performed.
ξWhen a calibration time is reached, the watch will perform the receive operation. The receive operation is not performed if a calibration time is reached while you are configuring settings.
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To perform manual receive
1. Hold down Afor at least two seconds.
ξThe x Second Hand will first indicate the last receive results as either Y (YES) or N (NO), and then move to RC (Receive in progress) to indicate
that signal reception has started.
2. The watch’s time setting is adjusted automatically whenever a receive operation is successful.
Note
ξ It can take as long as 30 seconds for signal reception conditions to stabilize.
ξ If you want to stop a receive operation at any time, press A.
ξIf reception fails for some reason, check the surrounding area and eliminate possible causes for failure and then try again. See “To get ready for a receive operation” (page
To check the result of the latest receive operation
1. Press A.
ξ The x Second Hand will indicate the result of the last receive operation.
Y (YES) | Receive successful |
N (NO) | Receive failed |
2. Press Ato return to regular timekeeping. Regular timekeeping also will | |
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| resume if no operation is performed for about fi ve seconds. |
Note
ξ The x Second Hand will indicate N (NO) if you have adjusted the time setting manually since the latest receive operation.
Radio-controlled Atomic Timekeeping Precautions
ξStrong electrostatic charge can result in the wrong time setting.
ξEven if a receive operation is successful, certain conditions can cause the time setting to be off by up to one second.
ξThe watch is designed to update the date automatically for the period January 1, 2000 to December 31, 2099. Updating of the date by signal reception will no longer be performed starting from January 1, 2100.
ξIf you are in an area where signal reception is not possible, the watch keeps time with the precision noted in “Specifications” (page
ξThe receive operation is disabled under any of the following conditions.
−While the battery charge level is at Level 3 or lower (page
−While the watch is in the function sleep state (power saving, page
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Configuring Time and Date Settings
To check the current location setting
Normally time and date settings are confi gured automatically when a time calibration signal is received in accordance with your location setting.
Important!
ξWhenever you are in an area where a signal cannot be received or if your location setting does not support signal reception, you will need to configure time settings manually. See “Configuring Time and Date Settings Manually” (page
Location Setting
Select one of the location settings shown below in accordance with your current location.
In China | CN (HKG, HONG KONG) |
In Japan | JP (TYO, TOKYO) |
Any other location | OFF (Receive off) |
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Setting the wrong location can make reception impossible or may result in incorrect time settings. See “Radio Controlled Atomic Timekeeping” (page
Important!
ξWhen using this watch in China, set CN (HKG, HONG KONG) as the location.
To change the location setting
1.Pull the crown out to the fi rst click.
ξThe x Second Hand will move to the currently selected location.
2.Push the crown back in.
ξThe x Second Hand will perform movement that indicates whether the watch’s battery requires charging. After that, regular timekeeping will resume. See “To use the charging guide” (page
1.Pull out the crown to the fi rst click.
ξ The x Second Hand will move to the currently selected location.
2.Rotate the crown to move the x Second Hand to the location setting you want to use.
Important!
ξLeaving the crown pulled out for more than two minutes without performing any operation will automatically cause setting operation to become disabled. If this happens, press the crown back in and then pull it out again to configure settings.