Oregon Scientific HR102 - Manual (Page 6)

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SECTION 2 OPERATION
THE BACK LIGHT
Press LIGHT to turn on the back light for five seconds.
OPERATING MODES
There are four operating modes, see FIG. A
NOTE : When no signals are received or the measurement is out of
range for five minutes, the receiver will disable the function and return
to the previous operating mode automatically.
HOW TO SET HEART RATE LIMITS
The heart rate limits help you determine if you are exercising within
your training zone. Whenever you go above or below your limits, an
indicator will flash to attract your attention. To set the heart rate limits,
see FIG. B
NOTE: The upper limit must exceed the lower limit. The transmitter
will adjust the ranges automatically according to the data entered.
You can also activate the heart rate limit alert function, so the transmitter
will emit beeping sound when the limits are exceeded. [see FIG. C]
REAL TIME CLOCK
To set the clock, see FIG. D
NOTE: The date format for 12-hour display is MONTH-DAY while
that for 24-hour display is DAY-MONTH.