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• Are all powerchairs susceptible to EMI?
Each make and model differs in its ability to resist electromagnetic interference. Each has a
particular level of “immunity” to interference measured in volts per meter (V/m). The higher the
immunity levels the greater the protection. In other words, a powerchair with a high immunity level
is less likely to be affected by an intense radio source than one with a low immunity level.
If you want to nd out how well your powerchair is protected against EMI, you can contact the
manufacturer and inquire about its immunity level.
Commonly Asked Questions
• What can I do to reduce the risk that my powered powerchair could be affected by EMI?
Here are some precautions you can take:
1. Do not turn ON or used hand-held personal communication devices, such a cellular phones or
citizens band (CB) while the powered LIBERTY™ 624 MINI is ON.
2. Be aware of nearby transmitters, such as TV stations or radio and hand-held or mobile two-way
radios, and try to avoid coming close to them. For example, a powered LIBERTY™ 624 MINI
with an immunity level of 20V/m should stay at least three feet from a hand-held, two-way radio
and ten feet from a mobile two-way radio.
3. Be aware that adding accessories or components, or modifying the powered LIBERTY™ 624
MINI may make it more susceptible to interference from radio wave sources. (Note: There is
no easy way to evaluate their effect on the overall immunity of the powered LIBERTY™ 624
MINI.)
• What should I do if my powered LIBERTY™ 624 MINI moves unexpectedly?
If untended motion or brake release occurs, turn the LIBERTY™ 624 MINI OFF as soon as it is
safe.
• If my powered LIBERTY™ 624 MINI moves unexpectedly, where should I report this?
You should report the incident to:
The manufacturer and/or distributor, and FDA’s MedWatch problem reporting program. Call 1-800-
FDA-1088 and ask for Form 3500.