Operation Guide 4757

Timekeeping

Use the Timekeeping Mode to set and view the current time and date. This section also explains how to set the current date and time manually.

•If you become confused and lose your way during the following procedures, simply put the watch down and do not perform any button operation for two or three minutes. This will cause the watch to enter the Timekeeping Mode (indicated by normal one-second movement of the second hand) automatically. After that, you can try performing the manual setting procedure again from the beginning.

•All of the operations in this section are performed in the Timekeeping Mode, which you enter by pressing C.

 

Hour hand

 

 

 

 

 

 

 

 

Minute hand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Date

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Press B.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Day of week

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

Time zone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Second hand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To set the time and date manually

 

 

 

 

 

 

 

 

 

 

 

 

 

1. In the Timekeeping Mode, hold down Buntil the Time

II I I II

 

Zone starts to flash, which indicates the setting screen.

 

• The analog hands do not move in the setting screen.

II

 

 

I

2. Press C to cycle through settings in the sequence shown

I

I I I I

I

I

 

below.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Press C.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hour

 

 

 

 

Time zone

 

 

 

 

 

 

 

DST

 

 

Seconds

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Auto Receive Day Month Year Minutes

3.Select the setting you want to change, and then use Ato change it as shown below.

Screen

To do this:

 

 

Do this:

 

Cycle through time zones

 

 

Press A.

 

Toggle between Auto DST (), Standard Time (), or Press A.

 

Daylight Saving Time ( )

 

 

 

 

Reset the seconds to

 

 

Press A.

 

Change the hour

 

 

Press A.

 

Change the minutes

 

 

Press A.

 

Change the year

 

 

Press A.

 

 

 

 

 

 

Change the month

 

 

Press A.

 

 

 

 

 

 

Change the day

 

 

Press A.

 

 

 

 

 

 

Toggle signal auto receive on () and off (

)

Press A.

(This setting is possible only for time zones that support time calibration signal reception.)

•For full information on time zones, see the “Time Zone Table”.

•When setting the day, the watch automatically will skip days (30 and 31) that are not included in the currently selected month. If you can’t select 30 or 31 when you want to, check to make sure that the proper month is selected.

4.Press B to exit the setting screen.

•This will cause the hands to move to the current time, and resume normal movement.

•The current time will be shown on the digital display while the hands are moving.

•It can take as long as about 11 minutes for the hands to reach the proper time setting.

Note

•The auto receive setting is used for time calibration signal reception only. See “About Auto Receive” for details.

Daylight Saving Time (DST)

Daylight Saving Time (summer time) advances the time setting by one hour from Standard Time. Remember that not all countries or even local areas use Daylight Saving Time.

The time calibration signals include both Standard Time and DST data. When the Auto DST setting is turned on, the watch switches between Standard Time and DST (summer time) automatically in accordance with the signals.

• The default DST setting is Auto DST ( ) whenever you select +0, +1 or +2 as your Home Time Zone.

• Auto DST ( ) can be selected only while +0, +1 or +2 is selected as the Home Time Zone.

•If you experience problems receiving the time calibration signal in your area, it is probably best to switch between Standard Time and Daylight Saving Time (summer time) manually.

To change the Daylight Saving Time (summer time) setting

1.In the Timekeeping Mode, hold down Buntil the currently selected time zone appears on the display. This is the setting screen.

2.Press Cand the DST setting screen appears.3.Use A to cycle through the DST settings in the sequence shown below.
Auto DST ( )

 

 

DST off ( )

 

 

DST on ( )

 

 

 

 

 

 

 

 

 

 

 

4. When the setting you want is selected, press Bto exit the setting screen.

Reference

This section contains more detailed and technical information about watch operation. It also contains important precautions and notes about the various features and functions of this watch.

Auto Return Features

•The watch automatically returns to the Timekeeping Mode if you do not perform any button operation for one or two minutes while in the Receive Result Mode.

•The watch automatically returns to the Timekeeping Mode if you do not perform any button operation for two or three minutes while in the Alarm or Home Position Adjustment Mode.

•If you do not perform any operation for two or three minutes while a setting screen is selected, the watch will exit the setting screen automatically.

Scrolling

Ais used in various modes and setting screens to scroll through data. In most cases, holding down Aduring a scroll operation scrolls through the data at high speed.

Radio-controlled Atomic Timekeeping Precautions

•Strong electrostatic charge can result in the wrong time being set.

•The time calibration signal is bounced 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.

•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 a time calibration signal cannot be performed starting from January 1, 2100.

•This watch can receive signals that differentiate between leap years and non-leap years.

•Though this watch is designed to receive both time data (hour, minutes, seconds) and date data (year, month, day), certain signal conditions can limit reception to time data only.

•If you are in an area where proper time calibration signal reception is impossible, the watch keeps time within ±20 seconds a month at normal temperature.

•If you have problems with proper time calibration signal reception or if the time setting is wrong after signal reception, check your current time zone, DST (summer time), and auto receive settings. The following are the initial factory defaults for these settings.

Setting

Initial Factory Default

Time zone(GMT+1)
DST (summer time)(Auto switching)

Auto receive

(Auto receive)

Transmitters

This watch is designed to receive the time calibration signal transmitted from Mainflingen, Germany and the signal from Rugby, England. You can configure the watch to automatically select the transmitter that has the strongest signal.

In this case:

The watch does this:

The first signal auto search operation1. Checks the Mainflingen signal first.
after factory default settings are in effect,2. If the Mainflingen signal cannot be
or after the time zone has been changedreceived, checks the Rugby signal.
Any case other than the above1. Checks the last successfully received

 

signal first.

 

2. If the last successfully received signal

 

cannot be received, checks the other

 

signal.

 

 

Timekeeping

•Resetting the seconds to 00 while the current count is in the range of 30 to 59 causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are reset to 00 without changing the minutes.

•The year can be set in the range of 2000 to 2099.

•The watch’s built-in full automatic calendar makes allowances for different month lengths and leap years. Once you set the date, there should be no reason to change it except after you have the watch’s battery replaced.

•The current time for all time zones in the Timekeeping Mode is calculated in accordance with the Greenwich Mean Time (GMT) differential of each zone, based on your Home Time Zone time setting.

•GMT differential is calculated by this watch based on Universal Time Coordinated (UTC*) data.

*UTC is the world-wide scientific standard of timekeeping. It is based upon carefully maintained atomic (cesium) clocks that keep time accurately to within microseconds. Leap seconds are added or subtracted as necessary to keep UTC in sync with the Earth’s rotation. The reference point for UTC is Greenwich, England.

Illumination Precautions

An LED (light-emitting diode) illuminates the face of the watch for easy reading in the dark. In any mode (except when a setting screen is on the display), press Ato illuminate the face of the watch for about one second.

•The illumination provided by the light may be hard to see when viewed under direct sunlight.

•Illumination automatically turns off whenever an alarm sounds.•Frequent use of illumination can shorten the battery operating time.

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