Afikim Breeze-S4 Manuel d'utilisateur télécharger pdf (Page 30)

CHAPTER 10 – EMI WARNING

All types of electrically powered vehicles, such as powered wheelchairs and motorized scooters (in this

text all types will be referred to as “powered vehicles”) may be susceptible to electromagnetic

interference (EMI). This is from sources such as radio and TV stations, amateur radio (HAM)

transmitters, two-way radios and cellular phones. The interference (from radio wave sources) can cause

the powered vehicle to release its brakes, move by itself, or move in unintended direction. It can also damage the

powered vehicle’s control system. The intensity of the interfering EM energy can be measured in volts per meter (V/m).

Each powered vehicle can resist EMI interfering electromagnetic energy (EM) emitted up to a certain intensity. This is

called its “immunity level”. The higher the immunity level, the greater the protection. At this time, current technology is

capable of achieving an immunity level that would provide useful protection from the more common sources of radiated

EMI. This vehicle as shipped, with no further modification, has an immunity level of 20 V/m.

There are a number of sources of relatively intense electromagnetic fields in the everyday environment. Some of these

sources are obvious and easy to avoid. Others are not apparent and exposure is unavoidable. However, we believe that

by following the warning listed below, your risk of EMI will be minimized.

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: citizen band (CB) radios, “walkie talkies”, 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.

3. Long-range transmitters and transceivers such as commercial broadcast transmitters (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, as far as we know, are not likely

to cause EMI problems to your powered vehicle.

Powered Vehicle Electromagnetic Interference (EMI)

Because EM energy rapidly becomes more intense as one moves closer to the transmitting antenna, the

EM field from hand-held radio wave sources (transceivers) are of special concern. It is possible to

unintentionally bring high levels of EM energy close to the powered vehicle’s control system while using

these devices. This can affect powered vehicle movement and braking.

Therefore, the warnings listed below are recommended to prevent possible interference with the control system

of the powered vehicle.

WARNINGS

Electromagnetic interference (EMI) from sources such as radio and TV stations, amateur radio (HAM) transmitters, two-

way radios and cellular phones can affect powered vehicles.

Following the warnings listed below should reduce the chance of unintended brake release or powered vehicle

movement which could result in serious injury:

1) Do not operate hand-held transceivers (transmitters-receivers) such as citizen band (CB) radios, or turn

ON personal communication devices such as cellular phones, while the powered vehicle is ON;

2) Be aware of nearby transmitters, such as radio or TV stations and try to avoid coming close to them.

3) On appearance of unintended movements or brake release occurrences, switch the powered vehicle OFF

as it is safe to do so.

4) Be aware that adding accessories or components, or modifying the powered vehicle, may make it more

susceptible to EMI (since there is no easy way to evaluate their effect on the overall immunity level of the

powered vehicle).

5) Please report to us all incidents of unintended movement or brake release 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) This product delivered to you has an immunity level of 20 V/m.

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Afikim Breeze-S4 Manuel d'utilisateur Page 30

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