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7. Electromagnetic Interference (EMI)
Electromagnetic interference (EMI) may occur on your
Powerchair, by the electromagnetic energy from radio
stations, TV broadcasters, FM signal emitters, two-way
wireless power sources and mobile phones. EMI can cause
the control system of the Powerchair to lose its correct
function, leading to unintended start-up or random
movements. In addition to the possibilities of accidental
damage and injuries, EMI may cause permanent damage
to the control system. All Powerchairs resist a certain
degree of electromagnetic waves, i.e. immunity level, and
have passed EMI testing of 20 V/m (the unit of measure
for electromagnetic force) which means that it is immune
to the possible and negative effects caused by typical
EMIs.
Some of the electromagnetic fields can be avoided
easily but some are not. You can reduce the risks of EMIs
to minimum by gaining of the knowledge shown below:
● EMI is generated by three major sources:
1. Mobile radio transceiver (antennae attached)
For example, the transmission unit in the handheld
transceivers used by traffic police or rescuers as well
as the mobile phones and personal communication
devices on the market are all examples of EMI sources.