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HR Noise Detector: quick reference – rev. 1.1
3.8.
EXAMPLE OF USAGE: CASE HISTORY
At a private house:
•
Problem: Synchro Excite has got wrong heart rate beats during the training, usually
after 10, 15 minutes of training. Wrong because higher than normal (suddenly HR freq.
peaks). In the same room (basement room), there is also Recline and Run Excite that
doesn't give any problem at all.
•
Analysis: machine tested and HR works fine so it must be a noise that comes up after a
while. Check performed by Noise Detector all around: a source of noise nearby the
ceiling has been found. It's the floor heating plant of the upper room. Other machines
are not affected because HR receiver and user are in a lower position than Synchro, and
noise come from the high.
•
Solution: ceiling has been properly shielded by a professional company committed by
the customer.
At a hospital:
•
Problem: Vario Excite doesn't pick heart rate beats at all. All other Excite machines in
the room are working fine (Run, Bike, Recline and Step).
•
Analysis: check performed by Noise Detector nearby the Vario. No beats are showed at
all, even by using a tested Chest Belt transmitter. Moving around in the room, nearby
the other machines, Chest Belt beats are correctly showed. Analyzing all the area by
using the Noise Detector we found that Vario was in a position, full of electromagnetic
noise that made Noise Detector become saturated as well. Moreover Vario is much
susceptible to noise than other machines (ref. par.3.5 "Additional Note").
•
Solution: Vario has been moved in a free "electromagnetic noise area".
In a club:
•
Problem: Bike Excite has got issues with HR frequency. Frequency is not always
correct: sometimes disappears, sometimes is too high (220 beats), sometime doesn't
change (keeps low).
•
Analysis: check performed by Noise Detector. Bike is the last machine of a row, and
it's placed at the room corner. Electromagnetic interference has been found nearby that
corner. It came from a cabinet fixed to the floor containing some voltages regulators.
•
Solution: Bike has been moved far enough from this noise.
Page 3.7
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