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930486 Rev.A
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930486 Rev.A
2. Medium-Range Mobile Transceivers:
These include two-way radios used in police cars, fire trucks, ambulances and
taxi cabs.The antenna is usually mounted on the outside of the vehicle.
3. Long-Range Transceivers:
These include commercial radio and TV broadcast antenna towers and
amateur (HAM) radios.
Note: The following are not likely to cause EMI problems:
Lap-top computers (without phone or fax), Cordless phones,TV sets or
AM/FM radios, CD or tape players.
D. DISTANCE FROM THE SOURCE
EM energy rapidly becomes more intense as you get closer to the source.
For this reason, EMI from hand-held devices is of special concern.
(See C.1 above) A person 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 configurations tested and found to be immune to at least 20 V/m are:
Quickie S-525 power wheelchair with a right-hand mounted Penny & Giles Pilot
integral controller, 16” seat width, 16” seat depth, single-post height adjustable
armrest, swing-away hanger and U1 gel cell batteries.
Quickie S-525 power wheelchair with a right hand mounted QTRONIX remote
joystick system, 16” seat width, 16” seat depth, single-post height adjustable arm-
rests, swing-away hangers and U1 gel cell batteries.
4. a) Specialty input devices tested with the S-525 and QTRONIX controller
that were found to be immune to 20 V/m include:
• Breath Control
• Heavy Duty Switched Joystick
• Proportional Head Control
• Wafer Board
b) Specialty input devices tested with the S-525 and QTRONIX controller that
were found NOT to be immune to 20 V/m include:
• Tri-Switch Head Array
• Proportional Mini-Joystick/Chin Control
• Proximity Head Array
• Zero Touch Switch
• 4-Zero Touch Switch
• 5-Zero Touch Switch
c) Specialty input devices with an unknown immunity level because the devices
were not tested with the S-525 and QTRONIX controller include:
• Treadle Switch
• Ribbon Switch
• Disc Switch
• Buddy Button
• Micro Light
• Star Board
• Penta Switch
• Plate Switch
• Soft Switch
• Grasp Switch
• Wobble Switch
Individuals with physical limitations requiring the use of a specialty control input device
known not to be immune to 20 V/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 was a radio wave source near your chair
at the time.
Contact: Sunrise Medical Customer Service Department at (800) 333-4000
V. EMI (ELECTROMAGNETIC INTERFERENCE)
V. EMI (ELECTROMAGNETIC INTERFERENCE)