Karma KP-10.3, Руководство пользователя

Страница: 20 / 64

10
3. EMI/RFI
This section provides the user with basic information about the problems
with EMI, known sources of EMI and protective measures either to reduce the
possibility of exposure or to minimize the degree of exposure. This section
also shows some conditions in which unexpected or erratic wheelchair
movements may occur.
WARNING
●It is very important that you read this information regarding the possible
effects of electromagnetic interference on your electric KARMA wheelchair.
3.1 Electromagnetic Interference From Radio Wave Sources
3.1.1 Powered vehicles may be susceptible to electromagnetic interference
(EMI), which is interfering electromagnetic energy (EM) emitted from
sources such as radio stations (Radio FrequencyInterference), 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
amount of resistance 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.
This powered vehicle model, with no further modification, has an
immunity level of 20 V/m without any accessories.
3.1.2 There are a number of sources of relatively intense electromagnetic fields
in our everyday environment. Some of these sources are obvious and
easy to avoid. Others are not apparent and exposure could be
unavoidable. However, we believe that by following the warnings listed
below, your risk to EMI can be greatly minimized.