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Operation Guide 3090
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.
• Normally, the signal reception date shown by the Last Signal screen is the date data
included in the received time calibration signal. When only time data is received,
however, the Last Signal screen shows the date as kept in the Timekeeping Mode at
the time of signal reception.
• If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time within ±15 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 city code, DST (summer
time), and auto receive settings.
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 day of the week is displayed automatically in accordance with the date (year,
month, and day) settings.
• 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 or when battery power drops to
Level 5.
• The times for the Timekeeping Mode and all the city codes of the World Time Mode
are calculated in accordance with each city's UTC differential.
• The UTC differential is a value that indicates the time difference between a
reference point in Greenwich, England and the time zone where a city is located.
• The letters "UTC" is the abbreviation for "Universal Time Coordinated", which 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.
12-hour/24-hour Timekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is also
applied in all other modes.
• With the 12-hour format, the PM indicator (P) appears on the display for times in the
range of noon to 11:59 p.m. and no indicator appears for times in the range of
midnight to 11:59 a.m.
• With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without
any indicator.
Illumination Precautions
• The electro-luminescent panel that provides illumination loses power after very long
use.
• Illumination may be hard to see when viewed under direct sunlight.
• The watch may emit an audible sound whenever the display is illuminated. This is
due to vibration of the EL panel used for illumination, and does not indicate
malfunction.
• Illumination turns off automatically whenever an alarm sounds.
• Frequent use of illumination runs down the battery.
Auto light switch precautions
• The auto light switch is turned off automatically whenever battery power is at Level 4.
• Wearing the watch on the inside of your wrist, movement of your arm, or vibration of
your arm can cause frequent activation of the auto light switch and illumination of the
display. To avoid running down the battery, turn off the auto light switch whenever
engaging in activities that might cause frequent illumination.
• Note that wearing the watch under your sleeve while the auto light switch is turned
on can cause frequent illumination of the display and can run down the battery.
• Illumination may not turn on if the face of the watch is
More than 15 degrees
more than 15 degrees above or below parallel. Make
too high
sure that the back of your hand is parallel to the ground.
• Illumination turns off after the preset illumination
duration (1.5 seconds), even if you keep the watch
pointed towards your face.
• Static electricity or magnetic force can interfere with
proper operation of the auto light switch. If illumination
does not turn on, try moving the watch back to the
starting position (parallel with the ground) and then tilt it
back towards you again. If this does not work, drop your
arm all the way down so it hangs at your side, and then
bring it back up again.
• Under certain conditions, illumination may not turn on until about one second after
you turn the face of the watch towards you. This does not necessarily indicate
malfunction of the auto light switch.
• You may notice a very faint clicking sound coming from the watch when it is shaken
back and forth. This sound is caused by mechanical operation of the auto light
switch, and does not indicate a problem with the watch.
City Code Table
City
GMT
City
Code
Differential
PPG
Pago Pago
–11.0
HNL
Honolulu
–10.0
Papeete
ANC
Anchorage
–09.0
Nome
YVR
Vancouver
San Francisco, Las Vegas,
–08.0
LAX
Los Angeles
Seattle/Tacoma, Dawson City, Tijuana
YEA
Edmonton
–07.0
El Paso, Edmonton, Culiacan
DEN
Denver
MEX
Mexico City
YWG
Winnipeg
–06.0
Houston, Dallas/Fort Worth, New Orleans
CHI
Chicago
MIA
Miami
Montreal, Detroit, Miami, Boston,
YTO
Toronto
–05.0
Panama City, Havana, Lima, Bogota
NYC
New York
CCS
Caracas
–04.0
La Paz, Santiago, Port Of Spain
YHZ
Halifax
YYT
St. Johns
–03.5
RIO
Rio De Janeiro
–03.0
Sao Paulo, Buenos Aires, Brasilia, Montevideo
RAI
Praia
–01.0
LIS
Lisbon
+00.0
Dublin, Casablanca, Dakar, Abidjan
LON
London
MAD
Madrid
PAR
Paris
ROM
Rome
+01.0
Milan, Amsterdam, Algiers, Hamburg, Frankfurt, Vienna
BER
Berlin
STO
Stockholm
ATH
Athens
Helsinki, Istanbul, Beirut, Damascus,
CAI
Cairo
+02.0
Cape Town
JRS
Jerusalem
MOW
Moscow
+03.0
Kuwait, Riyadh, Aden, Addis Ababa, Nairobi
JED
Jeddah
THR
Tehran
+03.5
Shiraz
DXB
Dubai
+04.0
Abu Dhabi, Muscat
KBL
Kabul
+04.5
KHI
Karachi
+05.0
Male
DEL
Delhi
+05.5
Mumbai, Kolkata, Colombo
DAC
Dhaka
+06.0
RGN
Yangon
+06.5
BKK
Bangkok
+07.0
Jakarta, Phnom Penh, Hanoi, Vientiane
HKG
Hong Kong
BJS
Beijing
+08.0
Singapore, Kuala Lumpur, Manila, Perth, Ulaanbaatar
TPE
Taipei
SEL
Seoul
Pyongyang
+09.0
TYO
Tokyo
ADL
Adelaide
+09.5
Darwin
GUM
Guam
+10.0
Melbourne, Rabaul
SYD
Sydney
NOU
Noumea
+11.0
Port Vila
WLG
Wellington
+12.0
Christchurch, Nadi, Nauru Island
• Based on data as of December 2006.
Other major cities in same time zone
6
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