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5. E lectromagneVc I nterference ( EMI)

This s ec2on p rovides t he u ser w ith b asic i nforma2on t hat d escribes t he

problems w ith e lectromagne2c i nterference ( EMI), k nown s ources o f E MI,

protec2ve m easure t o e ither l essen t he p ossibility o r e xposure o r t o

minimize t he d egree o f e xposure, a nd s uggested a c2on s hould u nexpected

or e rra2c m ovement o ccur.

AXen2on : I t i s v ery i mportant t hat y ou r ead t his i nforma2on r egarding t he

possible e ﬀects o f e lectromagne2c i nterference o n y our P W-‐999UL

lectromagneVc I nterference ( EMI) f rom R adio W ave S ources

v  E

Powered w heelchair's m ay b e s uscep2ble t o e lectromagne2c

interference ( EMI), w hich i s i nterfering e lectromagne2c e nergy ( EM)

emiXed f rom s ources s uch a s r adio s ta2ons, T V s ta2ons, a mateur

radio ( HAM) t ransmiXers, t wo-‐way r adios, a nd c ellular p hones. T he

interference ( from r adio w ave s ources) c an c ause t he p ower

wheelchair t o r elease i ts b rakes, m ove b y i tself, o r m ove i n

unintended d irec2ons. I t c an a lso p ermanently d amage t he p ower

wheelchair's c ontrol s ystem. T he i ntensity o f t he i nterfering E M

energy c an b e m easured i n v olts p er m eter ( V/m). E ach p ower

wheelchair c an r esist E MI u p t o a c ertain i ntensity; t his i s c alled i ts

"immunity l evel". T he h igher t he i mmunity l evel, t he g reater t he

protec2on. A t t his 2 me, c urrent t echnology i s c apable o f a chieving a t

least a 2 0 V /m i mmunity l evel, w hich w ould p rovide u seful p rotec2on

from t he m ore c ommon s ources o f r adiated E MI. T his p ower

wheelchair P W-‐999UL h as b een s hipped w ith n o f urther m odiﬁca2on

and w ith a n i mmunity l evel o f 2 0 V /m w ithout a ny a ccessories.

There a re a n umber o f s ources o f r ela2vely i ntense e lectromagne2c

ﬁelds i n t he e veryday e nvironment. S ome o f t hese s ources a re

obvious a nd e asy t o a void. O thers a re n ot a pparent a nd e xposure i s

unavoidable. H owever, w e b elieve t hat b y f ollowing t he w arning l isted

below, y our r isk t o E MI w ill b e m inimized.

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