Seiko 7D48 - Technical Specifications

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SPECIFICATIONS
1 Frequency of crystal oscillator .......................... 32,768 Hz (Hz = Hertz … Cycles per second)
2 Loss/gain (monthly rate) .................................... Less than 15 seconds (worn on the wrist at normal
temperature range 5° C ~ 35° C)
3 Operational temperature range ......................... –10° C ~ +60° C
4 Driving system
•Step motor: 2 pieces
One for the hour and minute hands moving at five-second intervals
The other for the second hand moving at one-second intervals
•Piezoelectric motor (For perpetual calendar): 1 piece
5 KINETIC electricity storage unit ........................ Button type, 1 piece
6 Continuous operating time
•Time relay function ................................... Approximately 4 years (if the watch is fully charged)
•After the second hand starts moving
at two-second intervals ............................ Approximately 12 hours
7 Additional functions ........................................... Power save function, Perpetual Calendar, Energy
depletion forewarning function, Overcharge prevention
function
8 IC (Integrated Circuit) ........................................ C-MOS-IC, 3 pieces
Oscillator, frequency divider, drive and charge control, auto-relay control circuit, calendar control
circuit
9 Generating system ............................................ Miniature AC generator
* The specifications are subject to change without prior notice for product improvements.