21
Guidance and manufacturer’s declaration
-electromagnetic immunity
The chair is intended for use in the electromagnetic environment specified below.
The customer or the user of the chair should assure that is used in such and 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
80MHz to 2,5 GHz
3 Vrms
3 V/m
Portable and mobile RF
communications equipment should be
used no closer to any part of the chair
including 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 80MHz to 800 MHz
d = 2,3 √P 800MHz 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 separation distance in
metres (m).
Field strengths from fixed RF transmitters,
as determined by an electromagnetic
site survey, a should be less than the
compliance level in each frequency
range Interference may occur in the
vicinity of equipment marked with the
following symbol:
NOTE1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
a
b
Field strengths from fixed 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 accuracy. To assess the
electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey
should be considered. If the measured field strength in the location in which the chair is
used exceeds the applicable RF compliance level above, the chairshould be observed to
verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as re-orienting or relocating the chair.
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
