Polar F4TM User Manual download pdf (Page 21)

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

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Polar F4TM User Manual Page 21

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