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EMI WARNINGS (CONTINUED)
The sources of radiated EMI can be broadly classified into three types:
1) Hand-held Portable transceivers (transmitters-receivers with the antenna mounted
directly on the transmitting unit. Examples include: citizens band (CB) radios,
"walkie talkie," security, fire, and police transceivers, cellular telephones, and
other personal communication devices. **NOTE: Some cellular telephones and
similar devices transmit signals while they are ON, even when not being used;
2) Medium-range mobile transceivers, such as those used in police cars, fire
trucks, ambulances, and taxis. These usually have the antenna mounted on
the outside of the vehicle; and
3) Long-range transmitters and transceivers, such as commercial broadcast trans-
mitters (radio and TV broadcast antenna towers) and amateur (HAM) radios.
NOTE: Other types of hand-held devices, such as cordless phones, laptop computers,
AM/FM radios, TV sets, CD players, cassette players, and small appliances, such as
electric shavers and hair dryers, so far as we know, are not likely to cause EMI
problems to your powered scooter.
Powered Scooter Electromagnetic Interference (EMI)
Because EM energy rapidly becomes more intense as one moves closer to the
transmitting antenna (source), the EM fields from hand-held radio wave sources
(transceivers) are of special concern. It is possible to unintentionally bring high
levels of EM energy very close to the powered scooter's control system while
using these devices. This can affect powered scooter movement and braking.
Therefore, the warnings listed are recommended to prevent possible interference
with the control system of the powered scooter.
Electromagnetic interference (EMI) from sources such as radio and TV stations, ama-
teur radio (HAM) transmitters, two-way radios, and cellular phones can affect pow-
ered scooters. Following the warnings listed should reduce the chance of unintended
brake release or powered scooter movement which could result in serious injury.
1) Do not operate hand-held transceivers (transmitters receivers), such as citi-
zens band (CB radios, or turn ON personal communication devices, such as
cellular phones, while the powered scooter is turned ON;
2) Be aware of nearby transmitters, such as radio or TV stations, and try to
avoid coming close to them;
3) If unintended movement or brake release occurs, turn the powered scooter
OFF as soon as it is safe;
4) Be aware that adding accessories or components, or modifying the powered
scooter, may make it more susceptible to EMI (Note: There is no easy way to
evaluate their effect on the overall immunity of the powered scooter); and
5) Report all incidents of unintended movement or brake release to the pow-
ered scooter manufacturer, and note whether there is a source of EMI nearby.
Important Information
1) 20 volts per meter (V/m) is a generally achievable and useful immunity level
against EMI (as of May 1994) (the higher the level, the greater the protection);
2) The immunity level of this product is unknown.
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GENERAL GUIDELINESPROCEDURE 1