Self-Winding Split-Seconds Chronograph; Calibre 3612 - Omega 1424 Operating Instructions Manual

2 Operating instructions

Self-winding split-seconds chronograph

CALIBRE 3612 (fig. XXII)
Watch functions:
The crown has 3 positions:
1. Normal position (wearing position): the crown pushed in
against the case guarantees water resistance.
Occasional winding: if the watch has not been worn for 52 hours
or more, wind the watch by turning the crown whilst in position 1.
2. Correcting the date: pull the crown out to position 2, turn the
crown backwards, then push the crown back to position 1.
NB: the date cannot be corrected between 9 pm and 12.30 am.
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3. Time setting: hours – minutes – seconds. Pull the crown out to
position 3. The seconds hand will stop. Turn the crown forwards or
backwards. Synchronise the seconds by pushing the crown back to
position 1 to coincide with a given time signal.
Chronograph functions:
• Pusher A: start – stop, start – stop, etc.
Timekeeping with a resolution of 1/8 of a second for up to 12 hours.
• Pusher B: reset (after a stop).
Note: the chronograph must always be stopped before the zero
resetting function is used. Never push the chronograph's two pushers
(A and B) simultaneously.
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2 Operating instructions
Self-winding split-seconds chronograph
Chronograph functions with split-seconds:
The split-seconds function allows split times to be recorded whilst
the chronograph is running.
1. Start the chronograph by pressing pusher (A) (start).
2. To record a split time, press pusher (C). The split-seconds hand (D)
stops, indicating the split time, whilst the chronograph continues
running.
NB: the split time should be read immediately, since the chrono-
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graph totalisers for hours (G), minutes (E) and seconds (F) continue
to measure the elapsed time.
3. Press pusher (C) for the split-seconds hand (D) to catch up with the
chronograph seconds hand (F).
4. To record a new split time, start from step 2 above.
5. Press pusher (A) to stop the chronograph.
6. Press pusher (B) to reset.
NB: the split-seconds hand (D) must have caught up with the
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chronograph seconds hand (F) as explained in step 3 before the
chronograph mechanism is reset/zeroed.
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