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D. DISTANCE FROM THE SOURCE
EM energy rapidly becomes more intense as you get closer to the source. For this
r
eason, EMI from hand-held devices is of special concern. (See C.1 above) A per-
son using one of these devices can bring high levels of EM energy very close to
your chair without you knowing it.
E. IMMUNITY LEVEL
1. The level of EM energy is measured in volts per meter (V/m). Every power wheelchair
can resist EMI up to a certain level. This is called its “immunity level”.
2. The higher the immunity level, the less the risk of EMI. It is believed that a
20 V/m immunity level will protect the power wheelchair user from the more common
sources of radio waves.
3. The Quickie S-11 with the following configuration was tested and found to be
imm
une to at least 20 V/m:
Qui
ckie S-11 power wheelchair with a right-hand mounted Penny & Giles VSI integral
controller, highback seat, flip-back armrests, solid flip-up footplate and U1 gel cell
batteries.
Individuals with physical limitations requiring the use of a specialty control
input device known not to be immune to 20V/m, or not known, should exercise
extra care around known sources of EMI.
There is no way to know the effect on EMI if you add accessories or modify this
chair. Any change to your chair may increase the risk of EMI. Parts from other
suppliers have unknown EMI properties.
F. REPORT ALL SUSPECTED EMI INCIDENTS
You should promptly report any unintended movement or brake release. Be sure
to indicate whether there w
as a r
adio wave source near your chair at the time.
Contact: Sunrise Medical Customer Service Department at (800) 333-4000.
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E
nglish
V. EMI (Electromagnetic Interference)