Sources of EMI, Distance from the Source

V . E M I ( E L E C T R O M A G N E T I C I N T E R F E R E N C E )

C. SOURCES OF EMI

The sources of EMI fall into three broad types:

1.Hand-Held Transceivers:

The antenna is usually mounted directly on the unit.These include:

•Citizens band (CB) radios

•“Walkie-talkies”

•Security, fire and police radios

•Cellular phones

•Lap-top computers with phone or fax

•Other personal communication devices

Note: These devices can transmit signals while they are on, even if not in use.

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 G-424 power wheelchair with a left-hand mounted Penny & Giles Pilot integral controller, Highback contour seat, flip-back armrests, solid flip-up footplate and Gp24 gel cell batteries.

Quickie G-424 power wheelchair with a right-hand mounted QTRONIX remote

V . E M I ( E L E C T R O M A G N E T I C I N T E R F E R E N C E )

joystick system, Highback Contour seat, flip back armrests, solid flip-up footplate and GP24 gel cell batteries.

4.The following specialty import devices have an unknown effect on the immunity level because they have not been tested on the G-424 with the QTRONIX controller:

•Breath Control

•Tri-Switch Head Array

•Heavy Duty Switched Joystick

•Treadle Switch

•Ribbon Switch

•Proximity Head Array

•Zero Touch Switch

•4-Zero Touch Switch

•5-Zero Touch Switch

•Disc Switch

•Proportional Head Control

•Proportional Mini-Joystick/Chin Control

•Buddy Button

•Micro Light

•Star Board

•Wafer 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 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 was a radio wave source near your chair at the time. Contact: Sunrise Medical Customer Service Department at (800) 333-4000.

930484 Rev. A