Grand Seiko Quartz 4J51, Руководство по эксплуатации

Страница: 22 / 22

■ LEAP SECOND
Normally there are 86,400 seconds in a day. Due to a slight change in the earth’s rotation, an
extra second may be added to one day during the year. This is called the leap second. Every
year the decision is made whether such an adjustment is needed. When the adjustment takes
place, the standard time should be corrected by delaying the standard time one second.
○ To keep your Grand Seiko watch accurate with the world standard time, adjust your watch
to a time signal whenever such adjustment is made. According to the information from the
observatories all over the world, the standard time is delayed one second simultaneously
throughout the world by the Greenwich Royal Observatory.
○ In the Greenwich Mean Time, an extra second will be added to the one minute between 11:59
p.m. and 0:00 a.m. either on December 31st or on June 30th.
○ However, the adjustment may not be made in some years. Please check by a newspaper,
etc. whether such an adjustment will be made or not.
■ SPECIFICATIONS (MOVEMENT)
Frequency of crystal
oscillator
32,768 Hz (Hz = Hertz...Cycles per second)
Loss/gain Annual rate ±10 seconds
Operational temperature
range
Between –10 ºC and +60 ºC
Driving system Step motor
IC (Integrated Circuit) C-MOS-IC: 1 piece
* When used on the wrist within a normal temperature range (between 5 ºC and 35 ºC) for
approximately 8 hours per day. Monthly rate of loss/gain may amount to approximately 2
seconds depending on the condition of use.
* The specifications are subject to change without prior notice due to product improvement.
■ BATTERY
Caliber number Battery (SB-) Battery life
9F86
AN
Approximately 3 years
9F85
9F83
9F82
9F62
9F61
4J52 AG
4J51 AC
8J55 AN Approximately 5 years
○ The battery life is the estimated life for a watch with a new battery installed. The battery in
your watch at the time of purchase was inserted in the watch at the factory for performance
checks. It may run down earlier than the above-specified period.
○ When the battery nears its end, the seconds hand moves at two-second intervals instead of
normal one-second intervals. The watch remains accurate while the seconds hand is moving
at two-second intervals.
40
LEAP SECOND
41
Address