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8.1 INTERFERENCE DURING EXERCISE
Electromagnetic Interference
Disturbances may occur near high voltage power lines, traffic lights,
overhead lines of electric railways, electric bus lines or trams,
televisions, car motors, bike computers, some motor driven exercise
equipment, cellular phones, or when you walk through electric
security gates.
Exercise Equipment
Several pieces of exercise equipment with electronic or electrical
components such as LED displays, motors, and electrical brakes
may cause interfering stray signals. To try to tackle these problems,
relocate the wrist unit as follows:
1. Remove the transmitter from your chest and use the exercise
equipment as you would normally.
2. Move the wrist unit around until you find an area in which it
displays no stray reading or does not flash the heart symbol.
Interference is often worst right in front of the display panel of
the equipment, while the left or right side of the display is
relatively free of disturbance.
3. Put the transmitter back on your chest and keep the wrist unit in
this interference-free area as far as it is possible.
4. If the Polar heart rate monitor still does not work with the
exercise equipment, this piece of equipment may be electrically
too noisy for wireless heart rate measurement.
8. PRECAUTIONS
Transmitter Battery
The estimated average battery life span of the transmitter is 2500 hours of use. If you suspect that the transmitter battery
has run out, contact your authorized Polar Service Center for a replacement transmitter. Polar recycles used transmitters.
Wrist Unit Battery
The estimated average battery life of the wrist unit is one and half year in normal use. Please note that excessive use of the
backlight and the alarm signals drain the battery more rapidly. The symbol indicates low battery and that the battery
should be replaced. Do not open the wrist unit yourself. To ensure the water resistance properties and the use of qualified
components, the wrist unit battery should be replaced by an authorized Polar Service Center only. At the same time, a full
periodic check of the Polar heart rate monitor will be done.
Note:
• If the
symbol is displayed and you have switched the alarm on, the alarm will still activate one more time. After that the alarm
symbol
disappears. If you try to reset the alarm, the wrist unit displays Battery Low. You cannot reset the alarm until the battery is
changed.
• In cold conditions the low battery indicator may appear, but the indicator is deactivated when you return to a normal temperature.
•Water resistance cannot be guaranteed after unauthorized service.
Crosstalk
When in non-coded mode
the wrist unit picks up transmitter
signals within 3 feet/1 meter. Simultaneous non-coded signals from
more than one transmitter can cause an incorrect readout.
Using the Polar Heart Rate Monitor in a Water Environment
Your Polar heart rate monitor is water resistant to 100 feet/30 meters.
To maintain the water resistance, do not press the buttons of the
wrist unit under water.
Users measuring their heart rate in water may experience
interference for the following reasons:
• Pool water with a high chlorine content and seawater are very
conductive. The electrodes of a transmitter may short-circuit,
which prevents ECG signals from being detected by the
transmitter.
• Jumping into water or strenuous muscle movement during
competitive swimming may cause water resistance that shifts
the transmitter on the body to a location where it is not possible
to pick up ECG signals.
• The ECG signal strength depends on the individual and also
varies depending on an individual's tissue composition.
The percentage of people who have problems in heart rate
measuring is considerably higher in water than in other use.