Handleiding Seiko 9S63 (pagina 4 van 25) (Engels)

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Mean daily rate / Normal usage accuracy

The accuracy of a mechanical watch varies depending on many things,

such as the amount the spring is wound by movements of your arm, temperature, or resting

position of the watch.

Thus to show the accuracy of a mechanical watch evenly, not depending on the environment,

loss/gain of a mechanical watch is measured

before the inside movements of the watch are put in the case,

under controlled conditions,

with many days of tests.

And the measured rate is called “mean daily rate”.

In both the ISO3159 and Grand Seiko Standard*,

the standard rate is mean daily rate.

* “THE GRAND SEIKO STANDARD” P. 35

This rate is the data measured in an environment that is

artificially controlled,

in order to fairly evaluate/show the abilities of mechanical

watches without being influenced by environmental

changes.

So it is different from “normal usage accuracy”

when you are actually wearing the watch.

The accuracy of a mechanical watch varies delicately day

by day, depending on the environment.

This is like a living thing,

one of the charms that a mechanical watch has.

Normal usage accuracy should be from –1 second/day to +10 seconds (–1 to +8 seconds

for Cal. 9S86 and 9S85, –5 to +10 seconds for Cal. 9S27) /day. If the average of the daily

rates exceeds this level, we would like the responsibility for adjusting it accordingly (The cost

of adjusting the watch is free of charge for three years from the date of purchase.)

To adjust the accuracy as accurately as possible, information such as the rate of loss/gain

of your watch and how you use it, are very important. Please let us know the following when

you ask for adjustment of your watch by our service center.

(1) The average daily loss/gain rates for one week to ten days

Ex. an average of +11 seconds

(2) Approximate hours of wearing the watch in one day in the above period

Ex. Approximately 10 hours

(3) The resting position of the watch while you don’t wear it

Ex. Horizontal - Dial up

Vertical - the crown up

4INTRODUCTION -About mechanical watch-Characteristics of a mechanical watch

For lifelong use of your mechanical watch rule No.1

Wind the mainspring of your mechanical watch at a fixed time.

As there are rules for everything, there is a rule for

winding the spring.

You have not heard this before?

Please keep it in mind.

The mainspring - the source of energy for a

mechanical watch.

When it is fully wound, it can supply the most

stable energy to every part of the watch

movement, and the accuracy of the watch

becomes most stable.

Power the

mainspring

supplies

High

Low

Duration from a fully wound state

Even if your watch is a self-winding type, when you

feel the accuracy is not stable, turn the crown to

wind the mainspring further.

If you work at a desk, etc., and do not move too

much, the spring will not be wound sufficiently.

If your watch is a wind-up mechanical type, turn

the crown every day, at a fixed time to wind the

mainspring sufficiently.

To use the watch with better accuracy, wind the

mainspring every day, at a fixed time.

Please keep to this rule as best as possible.

For instance,

You may make it a rule to wind the spring

When you wake up, or at lunchtime.

For lifelong use of your mechanical watch rule No.2

Place your watch correctly, like this.

Half of one day, twenty-four hours,

when you do not wear your watch.

The accuracy while you do not wear the watch is included in “normal

usage accuracy”.

The mechanical watch that you take off.

Which position should the watch be put in?

The loss/gain of a mechanical watch

depends on the resting position of the watch.

In one position, the watch tends to gain, in another position, it doesn’t.

For instance, while you are sleeping at night,

when you do not wear your watch,

put the watch in various positions for seven to eight hours, such as

placing it with its face turned up,

or with the crown up, to find the best resting position for the watch for

reducing the loss/gain that occurs while you are wearing your watch.

Horizontal

-dial up

Vertical-

3 o’clock

INTRODUCTION -About mechanical watch-For lifelong use of your mechanical watch

English

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