Technical Notes On Cardio Receivers; General Information - Technogym 0WR00914AA Quick Reference

HR Noise Detector: quick reference – rev. 1.1

2. TECHNICAL NOTES ON CARDIO RECEIVERS

2.1.

GENERAL INFORMATION

Technogym utilizes Polar or Salutron technology for measuring the heart rate frequency of the
person training on the machine. The system consists of:
• a transmitter (Chest Belt), worn by the person training on the machine, which uses 2
electrodes to detect the electrical activity of the heart, and transmits the measured heart rate, by
sending an electromagnetic signal at a frequency of 5 KHz.
• A receiver, like the one in the figure below, installed in the machine, which consists of:
− an antenna a (coil), which receives the signal from the transmitter strap worn by the user.
− An integrated circuit b, which has the function of filtering the analog signal and generating a
pulse train corresponding to the received heart rate.
The receiver is connected to the CPU board by means of 3 wires used for:
− +5 Vdc power supply;
− Output signal (heart rate);
− Ground.
The output is a digital signal that is normally at 5 Vdc and goes to 0 Vdc, for a few msec., when
a heart beat is detected, as shown in the figure below.
Find more detailed information about that on all Excite Service manuals.
Page 2.1