70
Immunity test
IEC 60601
test level
Compliance
level
Electromagnetic envi-
ronment ‒ guidance
Voltage dips,
short interrup-
tions and vol-
tage variations
on power supply
input lines
IEC 61000-4-11
<5% UT
(>95% dip
in UT) for
0.5 cycle
40% UT
(60% dip in
UT) for
5 cycles
70% UT
(30% dip in
UT) for
25 cycles
<5% UT
(>95% dip
in UT) for
5 sec
<5% UT
(>95% dip
in UT) for
0.5 cycle
40% UT
(60% dip
in UT) for
5 cycles
70% UT
(30% dip
in UT) for
25 cycles
<5% UT
(>95% dip
in UT) for
5 sec
Mains power quality
should be that of a typi-
cal commercial or hos-
pital environment. If the
user of the SD 270 Audi-
ometer requires continu-
ed operation during po-
wer mains interruptions,
it is recommended that
the SD 270 Audiometer
be powered from an
uninterruptible power
supply or a battery
Power frequen-
cy (50/60 Hz)
magnetic field
IEC 61000-4-8
3 A/m
3 A/m
Power frequency ma-
gnetic fields should be
at levels characteristic
of a typical location in
a typical commercial or
hospital environment.
NOTE: UT is the a.c. mains voltage prior to the application of the test
level