25
24
Setting the date
Pull the crown to position B. Set the date by rotating the crown to the
right.
Date alteration should not be performed between 8 PM and
3 AM, as in this period the date is switched automatically by the
movement and damage may be caused to the switching mechanism.
If the month has less than 31 days, the date must be forwarded to the
1st of the following month by hand.
2.2 Operating the chronoscope
Starting time measurement (max. stop time 60 minutes)
Begin the chronoscope function by pressing the start-stop pusher (6).
Stopping time measurement
Stop the chronoscope function by pressing the start-stop pusher (6)
again.
Resetting
Press the reset pusher (9). The stop minute and the 1/5 second counter
return to the zero position.
Addition time measurement
Stop times may be added by pressing the start-stop pusher (9) again
after the initial measurement, in place of the reset pusher (6). The
chronoscope hands will then recommence from the stopped position.
Stop the chronoscope function by pressing the start-stop pusher (6)
again. To return the chronoscope hands to the zero position, press the
reset pusher (9).
3. Technical information
Calibre J645.82
Quartz chronoscope with 1/5 stop second
Stop time 60 minutes
Battery SR927SW
Operating temperature 0° to + 50° C
Calibre J645.83
Quartz chronoscope with 1/5 stop second and 24h display
Stop time 60 minutes
Battery SR936SW
Operating temperature 0° to + 50° C
Subject to technical alterations.
