Owner`s manual

Mercury Mambo Micro Powerchair Owner’s Handbook (Page 5) Part code: Z20943-00

This section of the manual will provide the user with basic information that describes the problems

with EMI, known sources of EMI, protective measures either to lessen the possibility or exposure or

to minimize the degree of exposure, and suggested action should unexpected or erratic movement

occur.

Attention: It is very important that you read this information regarding the possible

effects of electromagnetic interference on your Mambo Micro Powerchair.

2.4.1 Electromagnetic Interference (EMI) for Radio Wave Sources

Powerchairs may be susceptible to electromagnetic interference (EMI), which is interfering

electromagnetic energy (EM) emitted from sources such as radio stations, TV stations, amateur

radio (HAM) transmitters, two-way radios, and mobile phones. The interference (from radio wave

sources) can cause the powerchair to release its brakes, move by itself, or move in unintended

directions. It can also permanently damage the powerchair’s control system. The intensity of the

interfering EM energy can be measured in volts per metre (V/m). Each powerchair can resist EMI

up to a certain intensity. This is called its “immunity level”. The higher the immunity level, the

greater the protection. At this time, current technology is capable of achieving at least a 20 V/m

immunity level, which would provide useful protection from the more common sources of radiated

EMI. This powerchair model as shipped, with no further modification, has an immunity level of 20

V/m without any accessories.

There are a number of sources of relatively intense electromagnetic fields in the everyday

environment. Some of these sources are obvious and easy to avoid. Others are not apparent and

exposure is unavoidable. However, we believe that by following the warning listed below, your

risk to EMI will be minimized.

The sources of radiated EMI can be broadly classified into three types:

1. Hand-held portable transceivers (transmitter-receivers with the antenna mounted directly

on the transmitting unit). Examples include: citizens band (CB) radios, “walkie talkies”,

security, fire, and police transceivers, mobile telephones and other personal communication

devices.

Attention:

Some mobile telephones and similar devices transmit signals while they are ON, even

when not being used.

2. Medium-range mobile transceivers, such as those used in police cars, fire trucks,

ambulances and taxis. These usually have the antenna mounted on the outside of the

vehicle.

3. Long-range transmitters and transceivers, such as commercial broadcast transmitters (radio

and TV broadcast antenna towers) and amateur (HAM) radios.