Operation Guide 5179

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 non-leap years.

•If you are in an area where proper time calibration signal reception is impossible, the watch keeps time with the precision noted in “Specifications”.

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Timekeeping

•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 normally should be no reason to change it. Note, however, that if the watch is left uncharged for about one week after battery power drops to Level 3, the current time and all other settings return to their initial factory defaults.

•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 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.

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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 well-lit area.

•Press any button.

Elapsed Time in Dark

Operation

 

 

60 to 70 minutes

Second hand only is stopped, all other functions are

(second hand sleep)

enabled.

 

 

6 or 7 days

• All functions, including analog timekeeping, disabled

(function sleep)

• Internal timekeeping maintained

 

 

•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, 24-hour, day, day of the week

Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099

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 panel 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

–11

HNL

Honolulu

–10

ANC

Anchorage

–9

LAX

Los Angeles

–8

DEN

Denver

–7

CHI

Chicago

–6

NYC

New York

–5

SCL

Santiago

–4

RIO

Rio De Janeiro

–3

FEN

Fernando de Noronha

–2

RAI

Praia

–1

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.

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