Seiko 4J52 Manual - Page 14

■INTERCALARY SECOND (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 intercalary 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 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 • BATTERY(MOVEMENT) Frequency of crystal oscillator 32,768 Hz (Hz = Hertz...Cycles per second) Loss/gain (Annual rate) ±10 seconds 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. Operational temperature range Between -10 ºC and +60 ºC Driving system Step motor IC (Integrated Circuit) C-MOS-IC: 1 piece ※ The specifications are subject to change without prior notice due to product improvement. Caliber number 9F83 9F82 9F62 9F61 4J52 4J51 8J55 Battery (SB-) AN AG AC AN Battery life Approximately 3 years 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 second hand moves at two-second intervals instead of normal one-second intervals. The watch remains accurate while the second hand is moving at two-second intervals. 24