Manual

14
SPECIFICATIONS
Guidance and manufacturer’s declaration - electromagnetic immunity
The chair is intended for use in the electromagnetic environment specied below. The customer or the
user of the chair should assure that it is used in such an environment.
Immunity Test IEC 60601 test level Compliance level
Electromagnetic
environment - guidance
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2,5 GHz
3Vrms
3V/m
Portable and mobile RF communications equipment
should be used no closer to any part of the chair, in-
cluding cables, than the recommended separation
distance calculated from the equation applicable
to the frequency of the transmitter.
Recommended separation distance
d = 1.2
√
P
d = 1.2
√
P 80 MHz to 800 MHz
d = 2.3
√
P 800 MHz to 2,5 GHz
Where P is the maximum output power rating of the
transmitter in watts (W) according to the transmitter
manufacturer and d is the recommended separa-
tion distance in meters (m).
Field strengths from xed RF transmitters, as deter-
mined by an electromagnetic site survey,
a
should be
less than the compliance level in each frequency
range.
b
Interference may occur in the vicinity of equipment
marked with the following symbol:
NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reection from structures, objects and people.
a Field strengths from xed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile
radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accura-
cy. To assess the electromagnetic environment due to xed RF transmitters, an electromagnetic site survey should be
considered. If the measured eld strength in the location in which the chair is used exceeds the applicable RF com-
pliance level above, the chair should be observed to verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as re-orienting or relocating the chair.
b Over the frequency range 150 kHz to 80 MHz, eld strengths should be less than 3 V/m.