Technogym Top 600 XTPRO, Service Maintenance Manual

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TOP 600 XTPRO: Service & Maintenance Manual - rev. 2.0
11. APPENDIX
11.1. TECHNICAL NOTES ON CARDIO RECEIVERS
Technogym utilizes Polar technology for measuring the heart rate frequency of the person training
on the machine. The Polar system consists of:
•
a transmitter , 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 , shown in the figure below, which consists of:
Figure 11.1-1
−
an antenna a , designated the “coil”, which receives the signal from the transmitter strap worn by
the user.
−
an integrated circuit b , designated the ASIC, which has the function of filtering the analog
signal and generating a pulse train corresponding to the received heart rate.
−
two contacts c parallel to the coil, on which a 15 KOhm resistor is sometimes mounted.
The receiver is connected to the CPU board by means of 3 wires 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.
Page 11.1