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Voltage dips, short < 5% UT (> 95% of dip < 5% UT (> 95% of dip Mains power quality should
interruptions and in UT for 1/2 cycle) in UT) for 1/2 cycle be that of a typical commercial
v
oltage variations 40% UT (60% of dip 40% UT (60% of dip or hospital environment.
on power supply in UT) for 5 cycle in UT) for 5 cycle If a better mains power
input lines 70% UT (30% of dip 70% UT (30% of dip quality is required, it is
IEC 61000-4-11 in UT) for 25 cycle in UT) for 25 cycle recommended that the
< 5% UT (> 95% of dip < 5% UT (> 95% of dip Balance System SD is
in UT) for 5 sec in UT) for 5 sec powered from an uninter-
ruptible power supply
Power frequency 3 A/m 3 A/m If image distortion occurs,
(50/60 Hz) magnetic it may be necessary to
field position the Balance System
IEC 61000-4-8 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
Conducted RF 3 Vrms, 3 Vrms, Portable and mobile RF
IEC 61000-4-6 150 KHz to 80 MHz 150KHz to 80 MHz communications equipment
should be used no closer to
Radiated RF 3 V/m, 3 V/m, any part of the Balance Sysem
IEC 61000-4-3 80 MHz to2.5 GHz 80 MHz to2.5 GHz 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,
a
should be less than
the compliance level in each
frequency range.
b
Interference may occur in the
vicinity of equip-
ment marked with
the following
symbol:
CONTENTS
— E-3 — APPENDIX E
Continued from previous page
UT is the a.c. mains voltage prior to application of the test level.
At 80 MHz and 800 MHz, the higher frequency range applies.
These guidelines may not apply in all situations.
Electromagnetic propagation is affected by absorption and reflections from
structures, objects and people
a
Field strength from mixed transmitters, such as base stations for
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.
b
Over the frequency range 150 KHz to 80 MHz, field strengths
should be less than 3 V/m.
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