Bedienungsanleitung Seiko 8R48 (Seite 11 von 11) (Englisch)

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English

ACCURACY OF MECHANICAL WATCHES

● The accuracy of mechanical watches is indicated by the daily rates of one week or

so.

● The accuracy of mechanical watches may not fall within the speciﬁed range of

time accuracy because of loss/gain changes due to the conditions of use, such as

the length of time during which the watch is worn on the wrist, arm movement,

whether the mainspring is wound up fully or not, etc.

● The key components in mechanical watches are made of metals which expand or

contract depending on temperatures due to metal properties. This exerts an effect

on the accuracy of the watches. Mechanical watches tend to lose time at high

temperatures while they tend to gain time at low temperatures.

● In order to improve accuracy, it is important to regularly supply energy to the balance

that controls the speed of the gears. The driving force of the mainspring that powers

mechanical watches varies between when it is fully wound and immediately before

it is unwound. As the mainspring unwinds, the force weakens.

Relatively steady accuracy can be obtained by wearing the watch on the wrist

frequently for the self-winding type and winding up the mainspring fully everyday

at a ﬁxed time to move it regularly for the wind-up mechanical type.

● When affected by strong external magnetism, a mechanical watch may loss/gain

time temporarily. The parts of the watch may become magnetized depending on

the extent of the effect. In such a case, consult the retailer from whom the watch

was purchased since the watch requires repair, including demagnetizing.

SPECIFICATIONS

1 Display system

Time/Calendar ............................................. Hour, minute and small second hands

Date is displayed in numerals

Stopwatch ................................................... Measures up to 12 hours

Stopwatch hour, Stopwatch minute and Stopwatch

second hands

2 Vibrations per hour............................................. 28,800

3 Loss/gain (daily rate) ........................................... B et w een +25 an d -15 seco nds at no rma l

temperature range (between 5 °C and 35 °C or

between 41 °F and 95 °F)

4 Continuous operating time ............................... More than approx. 45 hours

5 Driving system ................................................... Automatic winding type with manual winding

mechanism

6 Number of jewels............................................... 34 jewels

• The accuracy above is factory adjusted.

• Due to the characteristics of mechanical watches, any actual daily rate may not fall within the range of

time accuracy speciﬁed above dependent on the conditions of use, such as the length of time during

which the watch is worn on the wrist, temperature, arm movement, and whether the mainspring is

wound up fully or not, etc.

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