POLAR F1 - Manual (Page 14)

33 ENGLISH
7.1 POLAR HEART RATE MONITOR AND INTERFERENCE
Electromagnetic Interference
Interference 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 electric brakes
may cause interference with stray signals. To try to solve the
problem, relocate your 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 where it
displays no stray reading or the heart symbol does not flash.
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 interference.
3. Put the transmitter back on your chest and keep your wrist
unit in this interference-free area as far as it is possible.
Note: 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
The F1, F2 and F3 wrist units are non-coded and pick up
transmitter signals within 3 feet/1 meter. Other non-coded
signals, picked up simultaneously from more than one
transmitter, can cause incorrect readouts.
Using Your Polar Heart Rate Monitor in Water
Your Polar heart rate monitor is water resistant to
100 feet/30 meters. To maintain the water resistance, do not
press the side button 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 Polar transmitter may
short circuit, which prevents the transmitter unit from
detecting ECG signals.
• 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 an ECG signal.
• ECG signal strength is individual and also varies
depending on an individual's tissue composition.
The percentage of people who have problems measuring
their heart rate is considerably higher in water than in
other environments.
7. PRECAUTIONS