Polar F92tiTM Precautions, Using a Polar Heart Rate Monitor in a Water Environment, Crosstalk

10. PRECAUTIONS

10.1 USING A POLAR HEART RATE MONITOR IN A WATER ENVIRONMENT

Your Polar Heart Rate Monitor is water resistant to 330 feet/100 meters. To maintain the water resistance, do not operate the buttons of the wrist unit under water.

Heart rate measurement in a water environment is technically demanding 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 the 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 signal.

•The ECG signal strength varies depending on the individual’s tissue composition and the percentage of people who have problems in heart rate measuring is considerably higher in a water environment than in other use.

10.2 POLAR HEART RATE MONITOR AND INTERFERENCE

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.

Crosstalk

The Polar wrist unit in non-coded mode of operation picks up transmitter signals within 3 feet/1 meter. Non-coded signals from more than one transmitter picked up simultaneously can cause an incorrect readout.

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 Polar 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 flashing of 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 the 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.

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