151
Voltage dips, short
interruptions and
voltage variations on
power supply lines
IEC 61000-4-11
<5% U
T
(>95% dip in U
T
)
for 0.5 cycle
40% U
T
(60% dip in U
T
)
for 5 cycles
70% U
T
(30% dip in U
T
)
for 25 cycles
<5% U
T
(>95% dip in U
T
)
for 5 sec
<5% U
T
(>95% dip in U
T
)
for 0.5 cycle
40% U
T
(60% dip in U
T
)
for 5 cycles
70% U
T
(30% dip in U
T
)
for 25 cycles
<5% U
T
(>95% dip in U
T
)
for 5 sec
Mains power quality should be that of a typical
commercial or hospital environment. If user of the
equipment requires continued operation during
power mains interruptions, it is recommended
that the equipment be powered from an
uninterruptible power supply or a battery.
Power frequency (50/60
Hz) magnetic field
IEC 61000-4-8
3 A/m 3 A/m Power frequency magnetic field should be at
levels characteristic of a typical location in a
typical commercial or hospital environment.
NOTE U
T
is the a.c. mains voltage prior to application of the test level.
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