Jaeger-leCoultre 382 Operating Instructions Manual page 5

Accuracy
Manually wound or automatic mechanical watches
The precision of watch models with mechanical movements
is determined by the balance. The latter oscillates at a rate of
21,600 vibrations per hour. Despite all the care that the mas-
ter watchmakers of the Jaeger-LeCoultre Manufacture have
lavished on building and assembling your watch, its accuracy is
subject to the influence of gravity, magnetic fields, impacts and
ageing of the oils. The precision of a watch is measured by its
regularity of rate in various positions.
Your individual temperament and your activities could be the cause
of slight irregularities. If you observe a discrepancy in the running
of your watch, we advise you to entrust it to an authorised Jaeger-
LeCoultre retailer who will perform the necessary adjustments.
Water-resistance
Your Jaeger-LeCoultre watch is water-resistant to 5 bar/atm. The
water-resistance of your watch is identifiable by the
symbol engraved on the back. This means that your timepiece has
been tested at an overpressure of 5 bar, corresponding to an
immersion pressure 50 metres (1 bar/atm = approx. 10 metres).
In accordance with the ISO 22810/NIHS 92-20 standard, in
order to guarantee the durability of the watch's characteristics
over time and as the water-resistance may be affected by certain
activities, it is recommended that the user:
- have the water-resistance of the watch checked by an
authorised Jaeger-LeCoultre retailer, in accordance with the
recommendations of the Jaeger-LeCoultre Manufacture
and at any event after each opening of the case, in which
case it is advisable to perform an air overpressure test;
- check when making the purchase that the strap or bracelet
is suitable for the intended use;
- avoid subjecting the watch to excessively abrupt tempera-
ture changes;
- protect the watch from being dropped or suffering other
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shocks (have the watch checked after any violent impact);
- avoid the use of the controls, push-piece or time-setting crown
while under water or before the watch has dried after immersion;
- restore the time-setting crown and the push-pieces to their
normal positions (or, where applicable, close the compres-
sion key) after every manipulation;
- rinse the watch with fresh water after use in sea-water.
You may use your watch during short swims, and when jumping
in from the edge of a swimming pool but not from a diving board.
Your watch must not be used for scuba diving or for sports involv-
ing significant risk of impact, such as windsurfing or water-skiing.
Also note that leather straps are not suited to aquatic activities.
Furthermore, it is vital to have the water-resistance of your watch
checked by an authorised Jaeger-LeCoultre retailer at least once
every two years, and at any event before any period during which
it is liable to undergo prolonged and/or regular immersions.
Jaeger-LeCoultre
"1000 Hours Control" test
Jaeger-LeCoultre submits all its watches to the stringent "1000
Hours Control" test, a unique battery of comprehensive and
rigorous tests lasting a full 1000 hours.
The "1000 Hours Control" seal or legend placed or engraved
on the back of your watch certifies that the latter has und-
ergone this programme of observation in our laboratories
and has successfully passed all the tests relating to regularity
of rate, temperature, atmospheric pressure and resistance to
shocks and magnetic fields, as well as water-resistance trials.
Your watch is thus capable of withstanding the daily stresses
and strains that await it when worn on your wrist.
The criteria of the "1000 Hours Control" programme consi-
derably exceed the standards of official timing tests, which
deal only with part of the movement.
Jaeger-LeCoultre tests not only the movement prior to its
being cased up in the watch, but also the watch as a whole.
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