Polar CS300 User Manual

ENG

The wrist unit may be worn when swimming. It is not, however, a diving 

instrument. To maintain water resistance, do not press the buttons of 

the wrist unit under water. When measuring heart rate in water, you 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,  

  preventing ECG signals from being detected by the transmitter.

•  Jumping into water or a strenuous muscle movement during

  competitive swimming may shift the transmitter to a location on the  

  body where ECG signals cannot be picked up.

•  The ECG signal strength is individual and may vary depending on the

  individual’s tissue composition. Problems occur more frequently when  

  measuring heart rate in water.

•  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. 

•  To avoid erratic readings, move away from possible sources of

  disturbance.

•  Several pieces of exercise equipment with electronic or electrical

  components such as LED displays, motors, and electrical brakes  

  may cause interfering stray signals. To tackle these problems,  

  try the following:

  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 much as possible.

•  If the cycling computer still does not work with the exercise equipment,

  this piece of equipment may be electrically too noisy for wireless  

  heart rate measurement.

Crosstalk 

When in non-coded mode, the wrist unit picks up transmitter signals 

within 1 m / 3ft. Simultaneous non-coded signals from more than one 

transmitter can cause an incorrect reading.

•  If another person with a cycling computer or a heart rate monitor

  is causing interference, move away from that person and continue  

  your exercise normally. 

•  Alternatively, to avoid other people’s heart rate signals:

  1. Take the transmitter off your chest for 30 seconds. Move away  

    from the other device.

  2. Put the transmitter back on and bring the cycling computer up to 

     your chest near the transmitter’s Polar logo. The cycling computer  

    will start looking for a heart rate signal again. Continue your  

    exercise normally.

To avoid crosstalk from another cyclist with a speed sensor, keep a 

distance of at least one meter between your cycling computer and the 

speed sensor of the other cyclist.