JOG NOW : Service & maintenance manual - rev. 6.2
Page 3.10
3.14.
CARDIO RECEIVER BOARD
3.14.1.
HR/HS
(C
HEST BELT
/H
AND
S
ENSOR
)
The receiver reception area is approximately a circle with a 90cm radius. If there is
electromagnetic noise produced by high voltage lines, radio transmitters, monitors,
motors ecc… within this area, the receiver becomes saturated and no longer receives any
signal.
This board manages the signals received from the Telemetric Transmitter (
Chest Belt
) and from the
Hand Sensors, used by the user when exercising. The Board receives the +5Vdc power supply, from
the Display Board.
The Receiver Board, communicate with the Display Board in a
positive logic
mode. When the
Board is in stand-by, the signal is +5Vdc; as soon the Board receives a reliable source of heart rate
signal change to 0Vdc and then, for each heartbeat detected, generates a pulse going back to +5Vdc.
The Display Board, can recognize if the signal is generated by the Chest Belt transmitter (
wireless
signal
) or by the Hand Sensor (
contact signal
) from the width of the signal.
In particular: if the width signal is 30msec, comes from the Chest Belt (
wireless
); if the signal is
100msec comes from the Hand Sensor (
contact
).
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