Operation Guide 5145

●Charging Guide

●The tables in this section provide some guidelines about the amount of time required each day to ensure stable operation of the watch.

ξThe values provided here show the amount of charging required each day to support the operations below (all times approximate).

ξLight:

Exposure Level (Brightness)

Approximate

1.5 seconds/day

Charging Time

ξAlarm tone:

 

 

 

10 seconds/day

Outdoor sunlight (50,000 lux)

8 minutes

ξSignal receive:

Sunlight through a window

30 minutes

5 minutes/day

(10,000 lux)

 

ξDisplay operation:

 

 

Daylight through a window on

48 minutes

18 hours/day

an overcast day (5,000 lux)

ξStable operation is enabled

 

Indoor fl uorescent lighting

 

by frequent charging.

8 hours

(500 lux)

 

 

30

 

 

●Approximate Charge Times Required to Advance to a Higher Level

Exposure Level

 

Approximate Charging Time

 

 

 

 

 

 

(Brightness)

Level 5

Level 4

Level 3

Level 2

Level 1

 

 

 

 

 

 

 

Outdoor sunlight

 

3 hours

 

28 hours

8 hours

(50,000 lux)

 

 

 

 

 

 

 

Sunlight through a

 

8 hours

 

105 hours

28 hours

window (10,000 lux)

 

 

 

 

 

 

 

Daylight through a

 

 

 

 

 

window on an overcast

 

13 hours

 

169 hours

46 hours

day (5,000 lux)

 

 

 

 

 

Indoor fl uorescent lighting

 

144 hours

 

– – –

– – –

(500 lux)

 

 

 

 

 

 

 

ξNote that the charging times in the table above are for reference only. Actual charging time depends on a variety of environmental factors.

31

Power Saving

Power Saving causes the watch to enter a sleep state automatically, which causes the hands to stop and the display to go blank, whenever the watch is left in the dark. The Power Saving feature of the watch is turned on at the factory, but you can turn it off if you want.

ξNote that the watch also may enter a sleep state if the watch is blocked from light by your sleeve.

32

●What happens when the watch is in a sleep state

ξDisplay sleep

Display sleep is triggered whenever the watch is left in the dark for about one hour

any time between the hours of 10 p.m. and 6 a.m. ξThe display goes blank in the display sleep state.

Alarms and the hourly time signal continue to operate normally. Digital-analog time coordination and auto signal receive are both performed

normally.

ξThe watch does not enter a sleep state if it is in the Countdown Timer Mode or Stopwatch Mode.

33

ξFunction sleep

Function sleep is triggered whenever the watch is left in the dark for six or seven days.

ξ Alarms and the hourly time signal are disabled. Analog timekeeping and auto signal receive are both disabled.

ξ Internal timekeeping continues to operate normally.

●To recover from a sleep state

Move the watch to a brightly lit location or press any button.

ξIt can take up to two seconds before display fi gures re-appear after you place the watch in a well-lit area.

●Turning Power Saving On or Off

See the procedure under “Confi guring Time and Date Settings” (page 97) for information about turning off Power Saving.

Leaving the watch in a drawer or anywhere else it is dark can cause Power Saving to trigger in order to conserve battery power.

34

35

 

 

How a Radio-controlled Watch Works

■What is a radio-controlled watch?

A radio-controlled watch is designed to receive a time calibration signal that contains standard time data, and adjust its current time setting accordingly.

7UDQVPLWWHU /RQJZDYHWLPH

FDOLEUDWLRQVLJQDO

&HVLXP

:DWFK

DWRPLFFORFN

 

After the watch receives a Standard Time signal, it performs internal calculations to determine the current time. Because of this, there may be an error of up to one second in the indicated time.

36

■Calibration Signal

●The Japanese calibration signal (Call Sign: JJY) is maintained by the National Institute of Information and Communications Technology (NICT). It is transmitted 24 hours a day from Mt. Otakadoya (40 kHz) located in Fukushima Prefecture, and from Mt. Hagane (60 kHz) located on the border between Saga Prefecture and Fukuoka Prefecture.

●The Chinese calibration signal (Call Sign: BPC) is maintained by National Time Service center (NTSC) of China and is transmitted from Shangqiu.

●The U.S. calibration signal (Call Sign: WWVB) is transmitted by the National Institute of Standards and Technology (NIST) from Fort Collins, Colorado.

●The U.K. calibration signal (Call Sign: MSF) is transmitted by the National Physical Laboratory (NPL) from Anthorn, which is located near Anthorn, Cumbria.

●The German calibration signal (Call Sign: DCF77) is transmitted by Physikalisch - Technische Bundesanstalt (PTB) in Mainfl ingen, which is located southeast of Frankfurt.

ξTime calibration signal frequencies and transmitter locations are subject to change.

37

Note that transmission of the Japanese calibration signal may be interrupted occasionally due to maintenance, lightning, etc.

For more information, visit the website of the Japan Standard Time Group of the National Institute of Information and Communications Technology (NICT) at the URL below.

http://jjy.nict.go.jp/

ξNote that the above URL is subject to change.

■Reception Ranges

The table below shows the time calibration signal that the watch receives when a particular city code is selected as your Home City.

ξFor information about the Home City setting, see page 67. See page 73 for details about city codes.

Home City (Cities that support signal reception)

Radio receiver

 

 

TPE, SEL, TYO

Japan (JJY)

 

 

HKG, BJS

China (BPC)

 

 

(HNL), (ANC), YVR, LAX, YEA, DEN, MEX, CHI, NYC,

United States (WWVB)

YHZ, YYT

 

LIS, LON, MAD, PAR, ROM, BER, STO, ATH, (MOW)

U.K. (MSF) and Germany

(DCF77)

 

ξCity codes in parentheses indicate areas where reception may be possible only when conditions are good.

38

39