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 )
Heed all warnings to reduce the risk of unintended brake release or chair movement:
1.Beware of the danger from
2.Be aware of nearby radio or TV stations, and avoid coming close to them.
3.If unintended movement occurs, turn your chair off as soon as it is safe to do so.
A. WHAT IS EMI?
1.EMI means: electromagnetic (EM) interference (I). EMI comes from radio wave sources such as radio transmitters and transceivers. (A “transceiver” is a device that both sends and receives radio wave signals).
2.There are a number of sources of intense EMI in your daily environment. Some of these are obvious and easy to avoid. Others are not, and you may not be able to avoid them.
3.Powered wheelchairs may be susceptible to electromagnetic interference (EMI) emitted from sources such as radio stations,TV stations, amateur radio (HAM) transmitters, two way radios, and cellular phones.
4.EMI can also be produced by conducted sources or
B. WHAT EFFECT CAN EMI HAVE?
1.EMI can cause your chair, without warning, to:
•Release its brakes
•Move by itself
•Move in unintended directions
If any of these occurs, it could result in severe injury to you or others.
2.EMI can damage the control system of your chair.This could create a safety hazard, and lead to costly repairs.
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
•
•Security, fire and police radios
•Cellular phones
•
•Other personal communication devices
Note: These devices can transmit signals while they are on, even if not in use.
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 )
2.Medium-Range Mobile Transceivers:
These include
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:
D. DISTANCE FROM THE SOURCE
EM energy rapidly becomes more intense as you get closer to the source. For this reason, EMI from
E. IMMUNITY LEVEL
1.The level of EMI is measured in volts per meter (V/m). Every power wheel- chair 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.At the time of printing this Manual, the immunity level of a standard production Quickie P120 was believed to be at least 20 V/m.
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/RFI 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. Give notice to:
Sunrise Medical, Quality Department at (800)
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