5
CHRONOGRAPH – L687
Before each timing operation, the chronograph
hands must be at their start point.
Standard Start – Stop – Reset
function
Used for timing a single event:
• Press push-piece
2
: the chronograph will
start
.
• Press push-piece
2
: the chronograph will
stop
.
• Press push-piece
3
to
reset
.
Rally Add function (partial times)
Used for measuring successive events, but not the
intervals between them. Each result is automatically
added to the preceding one. To time the various
stages of a car rally, for example, follow the
procedure below:
• At the start of the first stage, press push-piece
2
:
the chronograph will
start
.
• At the end of the first stage, press push-piece
2
again: the chronograph will
stop
.
• Repeat for each stage of the rally.
• At the end of the final stage the chronograph will
show the total time of the rally, in other words, the
accumulated time for all the stages.
• Press push-piece
3
to
reset
.
Avoid setting the time while the chronograph
function is in use
Setting the time and stop seconds
Pull the crown out to position
3
when the small
seconds hand (situated at 9 o'clock) is at 60. Turn
the crown either way to the desired time display. As
soon as the time is synchronised, push the crown
back into position
1
.
Please refer to the 24H indicator to adjust to the
desired time, in terms of a.m. or p.m.
Avoid any date, month and day correction, or use
of the corrector 4, between 19:00 and 06:00; this
could damage the mechanism.
Quick date and month correction
Pull the crown out to position
2
, and then turn it
backward to the desired date and month display.
During this operation, your watch will continue to
run; no time adjustment will be required. The date
needs to be corrected after every month shorter
than 31 days. Push the crown back into position
1
. The date will change when the hour hand passes
midnight.
Moon phase correction
Pull the crown out to position
2
, and turn it forward
until the full moon appears in the centre of the
moon phase window. Find out the date of the last
full moon, and turn the crown forward through as
many revolutions as the number of days elapsed
since the last full moon, then push the crown back
into position
1
.
Day correction
Press the corrector
4
situated at 10 o'clock to
correct the day using the corrector tool.
