9
Voltage
dips,short
interruptions
and voltage
variations in
power supply
input lines
IEC 61000-4-
1
1
<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 s
N/A
Mains power quality should be that of a typical
commercial or hospital environment. If the user
of the IT-903 requires continued operation
during power mains interruptions, it is
recommended that the IT-903 be powered from
an uninterruptible power supply or a battery
Power
frequency
(50/60Hz)
magnetic field
IEC 61000-4-8
3 A/m
3 A/m
Power frequency magnetic fields 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.
Table 3
Guidance and manufacturer ’s declaration-electromagnetic immunity
The IT-903 is intended for use in the electromagnetic environment specified below. The customer
or the user of the IT-903 should assure that it is used in such an environment.
Immunity test
IEC 60601 test level
Compliance
level
Electromagnetic environment-guidance
Conducted RF
IEC 61000-4-6
3Vrms
150kHz to 80MHz
N/A
Portable and mobile RF communications
equipment should be used no closer to any
part of the IT-903, 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
