
8
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.
CAUTION:
●
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
Powered vehicles may be susceptible to electromagnetic interference
(EMI), which is interfering electromagnetic energy (EM) emitted from
sources such as radio stations (Radio Frequency Interference), 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 level of intensity. This amount of
resistance is called its immunity level. The higher the immunity level
is, the greater the protection will be. 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.
There are a number of sources of relatively intense electromagnetic
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