Timex M640 - Manual (Page 88)

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You can choose one of the Preset Target Heart Zones or set the Manual
Target Heart Rate Zone for a customized target heart rate zone.
Preset Target Heart Rate Zones
The preset heart rate zones described in the table below correspond to
your maximum heart rate (MHR) value.
Determine the zone you want to use by reviewing the table on page 5.
To choose a Preset Target Heart Rate Zone:
1. Press MODE until HRM Setup Mode appears.
2. Press START/SPLIT to cycle through the target heart rate zones (labeled
ZONE 1 to ZONE 5).
3. Press HEART RATE to turn the audible alert ON or OFF. If you turn on
the audible alert, the Watch will beep to alert you if you go above or
below your chosen target heart rate zone and continue beeping until
you return to your target zone.
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4. Press MODE to save your selected target heart rate zone and exit HRM
Setup Mode. When you leave HRM Setup Mode, the Watch will use the
target heart rate zone you have selected as the basis for all HRM-based
operations and tracking.
Manual Target Heart Rate Zone
The Manual Target Heart Rate Zone allows you to customize your lower
and upper target heart rate zone limits. You might use the Manual Target
Heart Rate Zone where the 10% range in the Preset Heart Rate Zones is
either too large or too small a range for your exercise goals.
To set the Manual Target Heart Rate Zone:
1. Press MODE until HRM Setup Mode appears.
2. Press START/SPLIT until MANUAL appears.
3. Press STOP/SET/RESET to enter the setting process. You will see the
word MANUAL flashing on the display.
4. Press MODE (NEXT) to begin setting the upper and lower target heart
rate zones.
5. Press START/SPLIT (+) to increase the flashing value, HEART RATE (–) to
decrease the flashing value, or MODE (NEXT) to move to the next value.
6. When you have finished setting the upper and lower target heart rate
zone limits, you can press STOP/SET/RESET (DONE) to save your
settings and exit the setting process or you can continue to set or
adjust other heart rate statistical data.
Zone Lower Limit Upper Limit
1 50% 60%
2 60% 70%
3 70% 80%
4 80% 90%
5 90% 100%