biodex BALANCE SYSTEM SD Operation & Service Manual page 96

CONTENTS
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Immunity test IEC 60601-1-2
Test level
Voltage dips, short < 5% UT (> 95% of dip
interruptions and in UT for 1/2 cycle)
voltage variations 40% UT (60% of dip
on power supply in UT) for 5 cycle
input lines 70% UT (30% of dip
IEC 61000-4-11 in UT) for 25 cycle
< 5% UT (> 95% of dip
in UT) for 5 sec
Power frequency 3 A/m
(50/60 Hz) magnetic
field
IEC 61000-4-8
Conducted RF 3 Vrms,
IEC 61000-4-6 150 KHz to 80 MHz
Radiated RF 3 V/m,
IEC 61000-4-3 80 MHz to2.5 GHz
NOte 1: UT is the a.c. mains voltage prior to application of the test level.
NOte 2: At 80 MHz and 800 MHz, the higher frequency range applies.
NOte 3: These guidelines may not apply in all situations.
Electromagnetic propagation is affected by absorption and reflections from
structures, objects and people
Field strength from mixed transmitters, such as base stations for
a
radio telephones and land mobile radios, amateur radio, AM or FM
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 consid-
ered. If the measured field strength in the location in which the
Balance System SD is used exceeds the applicable RF compliance
levels above, the Balance System SD should be observed to verify
normal operation. If abnormal performance is observed, additional
measures may be necessary, such as re¬orienting or relocating the
Balance System SD.
Over the frequency range 150 KHz to 80 MHz, field strengths
b
should be less than 3 V/m.
IEC 60601-1-2
Compliance level
< 5% UT (> 95% of dip
in UT) for 1/2 cycle
40% UT (60% of dip
in UT) for 5 cycle
70% UT (30% of dip
in UT) for 25 cycle
< 5% UT (> 95% of dip
in UT) for 5 sec
3 A/m
3 Vrms,
150KHz to 80 MHz
3 V/m,
80 MHz to2.5 GHz
— E-3 —
Electromagnetic
environment – guidance
Mains power quality should
be that of a typical commercial
or hospital environment.
If a better mains power
quality is required, it is
recommended that the
Balance System SD is
powered from an uninter-
ruptible power supply
If image distortion occurs,
it may be necessary to
position the Balance System
SD display further from
sources of power frequency
magnetic fields or to
install magnetic shielding.
The power frequency
magnetic field should be
measured in the intened
installation location to assure
that it is sufficiently low
Portable and mobile RF
communications equipment
should be used no closer to
any part of the Balance Sysem
SD, including cables,
than the recommended sep-
aration distance calculated from
the equation applicable to the
frequency of the transmitter.
Recommended separation
distance:
d = 1.2√ P 150 KHz to 80 MHz
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 watt (W)
according to the transmitter
manufacturer, and is the
recommended separtion
distance in meters (m).
Field strengths from fixed RF
transmitters, as determined
by an electromagnetic site
survey, should be less than
a
the compliance level in each
frequency range.
b
Interference may occur in the
vicinity of equip-
ment marked with
the following
symbol:
APPENDIX E