24
5.
Electromagnetic interference (EMI)
Important: You must be aware of the effect of electromagnetic
interference (EMI) regarding your LEVO
C
3
.
Please study the following
facts carefully.
Electromagnetical interference of transmitter and radio wavelength
Powered wheelchairs might be influenced by strong electromagnetic interference.
This interference is caused by radio and tv stations, amateur radio sets (walkie-
talkie), two-way radios and mobile phones. Interference (especially of radio
stations) might have an influence on the brakes of a powered wheelchair so that
they get released and so the chair runs away. It could also happen that the
wheelchair starts driving in a not desired direction or the stand-up function could
operate non-requested. There could occur constant damages to the steering
system of the powered wheelchair.
The intensity of power is measured in volt per meter (vpm). All powered
wheelchairs are able to resist to a certain amount of electromagnetic
interference. This is called "level of disruptive strength". The security depends on
the level of disruptive strength; the higher the level the better the protection.
Thanks to modern technology the capability of disruptive strength is up to 20
vpm.
The
LEVO
C
3
standard version (no further measures) is supplied with a
disruptive strength level of 20 vpm.
The
LEVO
C
3
is constructed to resist to a regular level of interference as it occurs
in a household. Beside that there exist a certain number of sources of relatively
strong magnetic fields to which you should stay in a safe distance. Some of these
magnetic fields are obvious and easy to avoid. Some other are not easy to be
realized and it is hard to stay off at times. Please take knowledge of the following
list of sources of interference and avoid getting close to these disruptive factors.
The EMI-risk is reduced to the minimum when you follow these instructions.
The sources of radiated EMI are put in three categories:
Portable sender and receiver on which an aerial is directly mounted.
Examples: CB-radio, walkie-talkie, sender and receiver of alarming systems,
fire alarm, police radio equipment, mobile phone and various private
communication systems.
Please notice: Some mobile phones and similar objects transmit signals as
soon as they are switched on even if they are not in use at the moment!
There have not been any known incidents caused by mobile phones to date.
Mobile sender and receiver of intermediate range, as they are installed in
police cars, fire engines, ambulances and cubs. The aerial is normally fixed on
the outside of the vehicle.
Sender and receiver of a huge range, as radio and TV stations and amateur
radio sets.
Be aware that wireless phones, lap tops, AM/FM-radios, TVs, CD players,
recorders as well as gadgets like razors, hair dryers and so on are only small