Bedienungsanleitung Seiko 9SA5 (Seite 11 von 15) (Englisch)

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Description of Grand Seiko Standard Terminology

Item Meaning

Position in inspection

Five orientations are specified by the International Standard ISO3159

so as to carry out various kinds of tests for time keeping. In addition

thereto, in the GS inspection, 12 o’clock Up position in the state where

a watch taken off the wrist is placed, is added, six orientations are

specified. (Dial Up, Dial Down, 12 o’clock Up, 3 o’clock Up, 6 o’clock

Up, and 9 o’clock Up)

Mean daily rate in six

positions

Mean value of a total of 12 daily rates measured in six different

positions, respectively, for two days. This is a target value indicating

basic loss/gain per day of a watch, however, it is required to

comprehensively judge the actual accuracy performance in

consideration of other items.

Mean variation of daily rate

Mean value of a total of six variations of daily rates between the first

day and second day when measured in six different positions for two

days each. It indicates the degree which daily accuracy stabilizes in

each position.

Maximum daily rate between

two consecutive daily rates in

the same position

Maximum value of a total of six variations of daily rates between the

first day and second day when measured in six different positions for

two days each. It indicates the degree which accuracy per day changes

at maximum according to positions.

Variation of rate between

positions horizontal and

vertical

Indicates loss/gain in two positions at which a watch is most frequently

used in daily life. It is a difference between mean daily rates for two

days when a watch is placed in the Dial Up position and mean daily

rates for two days when a watch is placed in the 6 o’clock Up position.

Maximum daily rate between

mean daily rate and any

individual rate

Maximum difference value between daily rates for 12 days in the test

initial stage and mean daily rates. It indicates the degree at which the

daily rate varies according to the manner for placing a watch.

Variation of daily rate per 1 °C

between 8 °C and 38 °C

Variation in daily rates per 1 °C between 38 °C and 8 °C in the same

position (Dial Up position). It indicates loss/gain in the temperature

environment (taken-off state from the wrist) where a watch is used.

Variation of daily rate per 1 °C

between 23 °C and 38 °C

Variation in daily rates per 1 °C between 38 °C and 23 °C in the same

position (Dial Up position). It indicates loss/gain in the temperature

environment (worn state of the wrist) where a watch is used.

Rate-resumption

Value obtained by subtracting mean daily rates of initial two days from

daily rate of the last inspection day. It indicates the degree at which

daily rate stabilizes after usage for a predetermined period.

The Grand Seiko Standard Inspection Certificate

○ This certificate accompanies your watch. It shows the precision values achieved by the

movement before it was cased and that the movement met the Grand Seiko Standard. The

precision tests were conducted in an artificially controlled environment in our facility. The

certificate shows the caliber number, the movement’s individual number and the case’s

individual number.

○Normal usage accuracy of a mechanical watch varies depending on individual customer’s

use conditions such as winding state of the mainspring by movement amount of the

customer’s arm per day, temperature environment, and position (orientation of a watch).

Accordingly, the actual normal usage accuracy when the watch is used by a customer may

differ from the numerical value of each item specified in the Grand Seiko Standard.

bCAUTION

Your Grand Seiko Inspection Certificate is unique and cannot be replaced or reissued if lost

or after maintenance or adjustment.

18 THE GRAND SEIKO STANDARD

Cautions for accuracy of mechanical watch

Mechanical watches have a mechanism that is moved by power generated when the

mainspring is unwound, and small metal parts physically work together to control the

accuracy. Fragile metal parts of a mechanical watch are easily influenced by external

environment such as temperature, gravity, and shock. Also, conditions of use such as normal

usage time and winding state of the mainspring can influence the loss/gain of the watch.

1Accuracy of mechanical watch is “mean daily rate.”

Accuracy of the quartz watch is indicated monthly or annually such as a monthly rate of

±15 seconds or annual rate of ±10 seconds. This indicates the degree of total difference

in accuracy when the quartz watch is continuously used for a month or a year.

To the contrary, accuracy of the mechanical watch is normally indicated as a “mean daily

rate.”

Accuracy of the mechanical watch slightly varies each day as it is influenced by various

conditions of use, and it is normally unstable. Then it is required to judge whether the

accuracy is satisfactory or not by checking the mean values in the case of use for a week

to ten days, but not for only one day.

For normal usage accuracy of Grand Seiko mechanical watch, -1 to +8 seconds per day

is specified as target values. If the mean value exceeds the abovementioned target value

in the normal usage condition when the watch is used for a week to ten days, we will adjust

it.

* Adjustment is provided free of charge within the guarantee period, then charged thereafter.

However, please note that the parts that are age-deteriorated due to long duration of use

may not be adjusted to your desired accuracy. For details, refer to pages P. 16 and

P. 20.

2Factor influencing accuracy (1): Wound amount of the mainspring

In order to use the mechanical watch at better accuracies, it is required to supply a constant

strong energy wherever possible to respective parts.

In the state where the mainspring is fully wound, accuracy is stable, however, when the

mainspring is unwound to weaken energy to be supplied, the parts controlling accuracy

tends to be externally influenced, and accuracy becomes unstable.

In order to use a mechanical watch at a steady accuracy, it is recommended to use it in a

condition where the mainspring is sufficiently wound.

3Factor influencing accuracy (2): Temperature influence

Mechanical watch parts are metal which slightly elongate and contract by change in

temperature, and this influences accuracy. Normally, under high temperatures, it tends to

lose time, and under low temperatures, it tends to gain time.

4Factor influencing accuracy (3): Difference by position (orientation of a watch)

Parts related to accuracy of a mechanical watch are also influenced by the earth’s gravity.

For example, gain or loss differs when a watch is horizontally placed and when it is vertically

placed in the 12 o’clock up position.

When the watch is not worn on the wrist, accuracy errors that occur while wearing can also

be compensated to some extent according to the position. Try to place it in various positions

to find the position appropriate to your watch.

THE GRAND SEIKO STANDARD

English

Seiko 9SA5 Seite 11

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