17
ELECTROMAGNETIC INTERFERENCE
RADIO WAVE SOURCES MAY AFFECT POWERED MOBILE VEHICLE CONTROL.
Electromagnetic Interference (EMI) From Radio Wave Sources
Powered vehicles may be susceptible to electromagnetic interference (EMI), which is interfering electromagnetic energy
(EM) emitted from sources such as radio stations, 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 directions. It can also permanently 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 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 at least a 20 V/m immunity level, which would provide useful
protection from the more common sources of radiated EMI. The immunity level of this powered vehicle is not known.
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 warnings listed below, your risk to EMI will be minimized.
The sources of radiated EMI can be broadly classified into three types:
1.
Handheld portable transceivers (transmitters-receivers) with 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 transmitters (radio and TV broadcast
antenna towers) and amateur (HAM) radios.
Note:
Other types of handheld devices, such as cordless phones, laptop computers, AM/FM radios, TV sets,
CD players and 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 vehicle.
Powered Vehicle Electromagnetic Interference (EMI)
Because EM energy rapidly becomes more intense as one moves closer to the transmitting antenna (source), the EM fields
from handheld radio wave sources (transceivers) are of special concern. It is possible to unintentionally bring high levels of
EM energy very 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 stations, TV stations, amateur radio (HAM) transmitters,
two-way radios and cellular phones, can affect electric vehicles. Following the warnings listed below should reduce the
chance of unintended brake release or mobile vehicle movement, which could result in serious injury.
1.
DO NOT operate or turn ON handheld personal communication devices, such as Citizens Band (CB) radios
and cellular phones while the vehicle 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 vehicle off as soon as it is safe.
4.
Be aware that adding accessories or components or modifying the vehicle may make it more
susceptible to interference from radio wave sources.
Note:
There is no easy way to evaluate their effect on the overall immunity of the vehicle.
5.
Report all incidents of unintended movement or brake release to the mobile vehicle 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 not known.
Summary of Contents for EXT350
Page 18: ...18 WIRING DIAGRAMS HI LO Handle Controls...
Page 19: ...19 TouchTron Handle Controls...
Page 20: ...EXPLODED VIEWS 20 RT EXPRESS...
Page 21: ...21 REAR DRIVE...
Page 22: ...22 HD450 EXT350...
Page 23: ...PARTS LISTS 23...
Page 24: ...24...
Page 25: ...25...
Page 27: ...NOTES Date Remark Date Remark Date Remark Date Remark Date Remark Date Remark Date Remark 27...
