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Avoid setting the time while the chronograph
function is in use
Setting the time and stop seconds
Pull the crown out to position 2 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.
If you have not been wearing your mechanical
watch, it needs to be wound manually through thirty
revolutions or so.
Avoid any date correction, or use of the corrector
4, between 20:00 and 03:00; this could damage
the mechanism.
Quick date correction
Press the corrector 4 to correct the date using the
corrector tool
The date needs to be corrected after every month
shorter than 31 days. The date will change when the
hour hand passes midnight.
Before each timing operation, the chronograph
hands must be at their start point.
Standard Start – Stop – Reset
function
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.
CHRONOGRAPH – L688
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.
Tachymeter scale
Enables the wearer to read the speed in
T
km/h. Time how long it takes to travel 1
kilometre. The point where the seconds
hand stops indicates the average speed. If it takes
30 seconds to travel 1 km, the scale will indicate an
average speed of 120 km/h.
Pulsometer scale
Enables the wearer to directly read their
heart rate, by starting the chronograph and
counting 30 beats
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