BALL Watch BMW Owner's Manual - page 11
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ENGLISH
※
Test 3
Greatest variation in rates: The greatest of the five variations in rates
in the five positions can’t be more than 5 seconds per day.
※
Test 4
Horizontal and vertical difference: The COSC subtracts the average
of the rates in the vertical position (on the first and second days) from
the average of the rates in the horizontal position (on the ninth and
tenth days). The difference must be no more than -6 to +8 seconds.
※
Test 5
Greatest deviation in rates: The difference between the greatest daily
rate and the mean daily test rate can’t be more than 10 seconds
per day.
※
Test 6
Rate variation due to the temperature: The COSC tests the
movement’s rate at 8 degrees Celsius (46 degrees Fahrenheit) and
at 38 degrees Celsius (100 degrees Fahrenheit). It subtracts the cold
temperature rate from the hot temperature rate and divides by 30.
The variation must be no more than 0.6 seconds per day.
※
Test 7
Resumption of the rate: This result is obtained by subtracting the
average mean daily rate of the first two days of testing from the
mean daily rate of the last test day. The resumption of rate can’t be
more than 5 seconds.
Power reserve
The BALL for BMW Power Reserve features a power reserve
indicator that displays the remaining power reserve on a hand. The
indicator will turn counter-clockwise as the power diminishes. During
manual winding or when the watch is worn, the reserve indicator will
move clockwise.
The natural movements of your arms wind the watch up automatically
and the energy will be stored up as power reserve. Manual winding
is only necessary if you stop wearing your watch for several days
or if it stopped.
Remarks:
Do not overwind the watch. Manual winding should be stopped when
the power reserve indicator reaches the end of the scale. Continued
winding could damage the movement.
The display at bottom is the power
reserve indicator. It shows the
remaining power reserve in the
watch in hours. If the watch is not
worn, or during periods of low
activity, the hand of the power
reserve indicator will wind down.