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Manual Jaeger LeCoultre Master Grand Reveil Q163842A Watch

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Manual

Technical characteristics

- Automatic winding mechanical movement,

Calibre 909/1.

- 28,800 vibrations per hour.

- Power reserve: approximately 45 hours.

- Accuracy adjusted and tested in six positions.

Movement

Functions

The Master Grand Réveil model is equipped with an alarm

and a perpetual calendar featuring a mechanism that takes

into account the length of the current month (28, 30 or 31

days) and counts a February 29th every leap year.

The alarm is equipped with an original feature : it gives the

user a choice between striking mechanism or vibrate modes.

This choice can be read in a window located between 10

o’clock and 11 o’clock, which indicates «AL» (alarm striking)

or «VIB» (vibrate) depending on the choice made (see below

for the setting procedure).

The Master Grand Réveil model indicates :

- The hour, minutes and seconds.

- The alarm time.

- The time over 24 hours with a red-zone indication from

8.30 pm to 3.30 am.

- The date, day of the week, month, year, decade, century

and moon phases in both hemispheres. These indications

operate mechanically without the slightest need for

readjustment until March 1st 2100.

All these data are linked together by an ingenious system,

a genuine programming feat that is entirely mechanical :

one need only set the initial date and all the functions will

subsequently follow on correctly in sequence.

Our time measurement is based on the Gregorian calendar,

i.e. a year of 365 days, 5 hours, 48 minutes and 46 seconds, or

in decimals 365.242192 days.

In practice, the excess yearly one-quarter of a day (0.242192)

is corrected by the February 29th in leap years. The few

missing decimals are then compensated for every 100 years,

by eliminating the February 29th.

To ensure greater precision, this elimination is not performed

when the number of centuries can be divided by 4.This was

the case in the year 2000 (20 being divisible by 4), which was

a normal leap year. It is therefore only in the year 2100 that

the programming of your Master Grand Réveil’s perpetual

calendar will have to be corrected. Until then, your watch

will count the days, months and years correctly, allowing for

leap years.

It is only on March 1st 2100 that the calendar will incorrectly

indicate Monday February 29th, whereas the actual date

will be Monday March 1st, due to the above-mentioned

centuryyear compensation system.

The date of your watch and the moon phases, which vary

by one day every 122 years, will have to be adjusted by a

qualiﬁed watchmaker.

Note

On the Master Grand Réveil model, the ﬁrst two digits of

the year are ﬁxed; they appear on a 1-position plate screwed

onto the movement.This plate indicates 20, and bears the

marking 21 on its back. In 2100, at the same time as the

perpetual calendar is adjusted, the watchmaker will reset the

plate to the ﬁgure 21.

Jaeger-LeCoultre Calibre 909/1.

Master Grand réveil - English 2/6

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Specifications

Brand	Jaeger LeCoultre
Model	Master Grand Reveil Q163842A
Category	Watches
File type	PDF
File size	0.48 MB

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Frequently Asked Questions about Jaeger LeCoultre Master Grand Reveil Q163842A Watch

Our support team searches for useful product information and answers to frequently asked questions. If you find an inaccuracy in our frequently asked questions, please let us know by using our contact form.

A battery in my device is oxidized, can I still safely use it? Verified

Ja, the device can still be safely used. Firstly, remove the oxidizd battery. Never use bare hands to do this. Then clean the battery compartment with a cotton swab dipped in vinegar or lemon juice. Let it dry and insert new batteries.

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My mechanical watch runs fast, what can I do? Verified

This might be caused by exposure to a magnetic field. It can be solved by a demagnetisation process performed by a professional watchmaker.

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What do AM and PM stand for? Verified

AM stands for Ante Meridiem and indicates that the time is before midday. PM stands for Post Meridiem and indicates that the time is past midday.

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What is a 'Chronograph'? Verified

A 'Chronograph' is literally a 'writer of time'. The term is used to describe clocks and watches that tell the time of day as well as measure a certain period of time, like a stopwatch.

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What is GMT? Verified

GMT stands for Greenwich Mean Time (sometimes called UTC, standing for Coordinated Universal Time). It is the time for the longitude 0, that passes through Greenwich near London.

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What is a quartz movement? Verified

Watches and clocks with a quartz movement are driven by a battery. This sends an electric current through quartz crystals that will vibrate. These vibrations are passed on to the movement. Because the vibrations have a fixed frequency, watches and clocks with a quartz movement are extremely precise.

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