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49ENGLISH
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. Relocate the wrist unit until you find an area in, which it displays
no stray reading and 00 is displayed. 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.
Crosstalk
Polar F4 wrist unit picks up transmitter signals within
3 feet/1 meter. Other signals, picked up simultaneously from more
than one transmitter, can cause incorrect readouts.
Using The Polar F4 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 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
environments.
8. PRECAUTIONS