WIRELESS HEART RATE MONITORS
DELPHI 5.0 AND 6.0
Your new Blackburn cycle computer may be equipped with a wireless heart rate monitor. The heart monitor
system is a sophisticated athletic training tool which is capable of measuring your heart rate with the
accuracy of a hospital ECG system. Heart rate monitors use a chest strap to pick up the electrical signal
emitted by the contractions of the heart and transmit the information to the computer. Every time the heart
beats, a short radio signal is sent from the chest transmitter to the computer. The computer measures the
time between the incoming signals, filters and averages them and displays a heart rate number on screen.
To achieve the most accurate heart rate reading possible, it is important to be aware of circumstances that
can cause false signals to enter the system and cause your heart rate measurement to be inaccurate.
1. The chest strap should be worn as tightly as possible without being uncomfortable. If the chest strap
is not tight enough, movement between it and your body can cause false signals to be generated,
which may be seen as heart beats by the watch. This is especially true during high impact activities,
such as running.
2. Environmental factors such as high-tension power lines, home security systems and radio towers may
interfere with the ability of the watch to receive a signal from the transmitter. A loss of the heart rate
signal and the heart rate display showing zero, will usually indicate this. This problem is usually
transient in nature, and will stop once you have passed out of the area of interference.
3. Occasionally, when you are using your heart rate monitor watch in close proximity to other heart rate
monitors, it is possible for your watch unit to pick up the signal from the other transmitters. This is
called cross-talk. When you are experiencing cross-talk, you will see a very high heart rate or a heart
rate of zero. If this happens, simply allow a bit more space between you and the other users.
4. While riding, the flow of air over your body may cause your jersey or shirt to flutter and tap against the
heart rate transmitter. This tapping can result in false signals being generated causing inaccurate
readings. If you find this happening, try wearing the transmitter backward so that the transmitter and
electrodes are against your back with the elastic strap across the front of your chest.
HOW THIS PRODUCT WORKS HOW THIS PRODUCT WORKS
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PRESSURE SENSING ALTIMETERS
DELPHI 6.0
Because the altimeter system in the Blackburn Delphi 6.0 relies on Barometric Pressure for its
measurements, it is critical that you regularly calibrate the unit to a known altitude. Generally, the small
pressure changes experienced during a day of use will have only a minor effect on the accuracy of the unit.
However, the arrival or departure of a weather front can change the current altitude display by several
hundred feet or more.
To simplify the calibration process the Blackburn Delphi 6.0 allows you to store your home altitude to
memory and calibrate the unit to this altitude at any time using a PRESS & HOLD of the OPTION key while in
the CURRENT ALTITUDE screen.
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CYCLE COMPUTER