Table 4 Recommended isolation distance between portable and
mobile RF communication equipment and this device
Note 1: At frequencies of 80MHz and 800MHz, the formula with a higher
frequency band shall be used. Note 2: These guidelines may not be
suitable for all situations. The electromagnetic transmission is affected
by absorption and reflection of buildings, objects and human bodies.
a. In theory, the field strength of fixed transmitters such as wireless
(cellular/cordless) telephones and ground mobile radio base stations,
amateur radio, AM and FM radio and television broadcasts, cannot be
accurately predicted. Investigation of electromagnetic sites shall be
considered to evaluate the electromagnetic environment of fixed RF
transmitters. If the field strength of the place where the electric wheelchair
is located is higher than the above RF coincidence level, the electric
wheelchair shall be observed to verify its normal operation. If abnormal
performance is observed, it is necessary to take supplemental measures,
such as re-adjustment of the direction or position of the electric
wheelchair.
b. The field strength should be less than 3V/m in the frequency range of
150kHz~80MHz.
(Corresponding to Table 204 in YY0505-2012)
This electric wheelchair is intended to be used in an electromagnetic
environment with controlled radioactive radiation. The purchaser or
user of the electric wheelchair can prevent electromagnetic
interference by maintaining the minimum distance between portable
and mobile radio frequency communication equipment (transmitter)
and the electric wheelchair according to the maximum rated output
power of the communication equipment.
Maximum
rated
output
power of
150kHz～
80MHz
d＝1.2
Spacing distance of the corresponding transmitter at
different frequencies/m
800MHz～
2.5GHz
d＝0.4
80MHz～
800MHz
d＝1.2
800MHz～
1.0GHz
d＝2.3
26MHz～
800MHz
d＝0.2
0.01
0.1
1
10
100
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
0.02
0.06
0.2
0.63
2
0.04
0.13
0.4
1.26
4
For maximum rated output power of a transmitter not listed in the table
above, the recommended isolation distance d (in m) can be determined
by the formula in the corresponding transmitter frequency column,
where P is the maximum rated output power of the transmitter supplied
by the transmitter manufacturer, in watts (W). Note 1: At frequencies of
80MHz and 800MHz, the formula with a higher frequency band shall be
used. Note 2: These guidelines may not be suitable for all situations.
Electromagnetic transmission is affected by the absorption and
reflection of buildings, objects and human bodies.
(Corresponding to Table 206 in YY0505-2012)
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