b
The conformance levels in the ISM frequency bands between 150 kHz and 80 MHz
and the frequency range of 80 MHz and 2.5 GHz are intended to reduce the prob‐
ability that mobile and portable communications equipment will produce disturban‐
ces when they are unintentionally brought near the patient. For this reason, the
additional factor of 10/3 is used when calculating the recommended safe distances
within these frequency ranges.
c
The field strength of stationary transmitters such as base stations of mobile tele‐
phones and land mobile radio devices, amateur radio stations, AM and FM, radio
and television broadcasters cannot be theoretically predetermined. To determine
the electromagnetic environment of stationary transmitters, a study of the location
should be considered. When the measured field strength at the site where the KEY
Laser 3+ / III upgraded is used exceeds the above conformance level, the STERI‐
clave B should be monitored to demonstrate proper function. Should unusual per‐
formance features be observed, additional measures may be required, such as e.g.
a different alignment or another location for the KEY Laser 3+ / III upgraded.
d
Within the frequency range of 150 kHz to 80 MHz, the field strength should be less
than 3V
eff
V/m.
2.5.3
Recommended safe distances
The KEY Laser 3+ / III upgraded is intended for use in an electromagnetic environ‐
ment in which HF disturbances are controlled. The customer or the user of the KEY
Laser 3+ / III upgraded can help prevent electromagnetic disturbances by main‐
taining the minimum distance between portable and mobile HF telecommunications
devices (transmitters) and the KEY Laser 3+ / III upgraded depending on the output
of the communication device as indicated below.
Rated power of the trans‐
mitter in W
150 kHz to 80 MHz
d=1.17
P
80 MHz to 800 MHz
d=0.35
P
800 MHz to 2.5 GHz
d=0.70
P
0,01
0,12
0,04
0,07
0,1
0,37
0,11
0,22
1
1,17
0,35
0,70
10
3,70
1,11
2,21
100
11,70
3,5
7,0
For transmitters whose maximum rated power is not in the above table, the recom‐
mended safe distance d in meters (m) can be calculated using the equation for the
respective gap, where P is the maximum rated power of the transmitter in Watts (W)
according to the manufacturer's information.
Comment 1: At 80 MHz and 800 MHz, the higher frequency range applies.
Comment 2: These guidelines may not be applicable in every case. The spread of
electromagnetic waves is absorbed and reflected by buildings, objects and people.
Instructions for use KEY Laser 3+ 1343 KEY Laser III 1243 upgraded
2 Safety | 2.5 Electromagnetic compatibility
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