Immunity tests
IEC 60601 test level
Conformance level
Electromagnetic environ‐
ment - guidelines
Voltage interruptions,
short-term interruptions
and fluctuations of the
supply voltage according
to IEC 61000-4-11
< 5% U
T
(>95% interruption)
for 1/2 period
40 % U
T
(60 % interruption)
for 5 periods
70 % U
T
(30% interruption)
for 25 periods
< 5% U
T
(>95% interruption)
for 5 s
(250 periods)
< 5% U
T
(>95% interruption)
for 1/2 period
40 % U
T
(60 % interruption)
for 5 periods
70 % U
T
(30% interruption)
for 25 periods
< 5% U
T
(>95% interruption)
for 5 s
(250 periods)
The quality of the supply
voltage should correspond
to that of a typical business
or hospital environment.
When the user of the KEY
Lasers 3+ / III upgraded
needs continued operation
even when the power sup‐
ply is interrupted, it is rec‐
ommended to supply the
KEY Lasers 3+ / III upgra‐
ded from an uninterrupted
power supply or a battery.
Magnetic field with a sup‐
ply frequency (50/60 Hz)
according to IEC
61000-4-8
3 A/m
3 A/m
Magnetic fields at the
mains frequency should
correspond to typical val‐
ues in a business and hos‐
pital environment.
Note: V T is the alternating mains voltage before the test level is used.
Immunity tests
IEC 60601 test level
Conformance level
Electromagnetic environment -
guidelines
Conducted HF distur‐
bances according to
IEC 61000-4-6
3 V
eff
150 kHz to 80
MHz outside of ISM
bands
a
10 V
eff
Portable and mobile radio devices
should not be used closer to the
KEY Lasers 3+ / III upgraded in‐
cluding the wires, than the recom‐
menced safe distance calculated
using the equation for the transmis‐
sion frequency.
Recommended safe distance:
d=0.35
P
d=0.35
P
for 80 MHz to 800 MHz
d=0.70
P
for 800 MHz to 2.5 GHz
with P as the maximum rated power
of the transmitter in Watts (W) ac‐
cording to the transmitter manufac‐
turer, and d as the recommended
safe distance in meters (m).
b
The field strength of stationary ra‐
dio transmitters should be less than
the conformance level at all fre‐
quencies in an on-site check
c
.
d
Close to devices that have the fol‐
lowing symbol disturbances are
possible.
NOTE 1: At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not be applicable in every case. The spread of elec‐
tromagnetic waves is absorbed and reflected by buildings, objects and people.
a
The ISM frequency bands (for industrial, scientific and medical applications) be‐
tween 150 kHz and 80 MHz are 6.765 MHz to 6.795 MHz; 13.553 MHz to 13.567
MHz; 26.957 MHZ to 27.283 MHz and 40.66 MHz to 40.70 MHz.
Instructions for use KEY Laser 3+ 1343 KEY Laser III 1243 upgraded
2 Safety | 2.5 Electromagnetic compatibility
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