ELECTROtorque plus 4892.
34
NOTE: 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 electromagnetic
waves is absorbed and reflected by buildings, objects and people.
The ISM frequency bands (for industrial, scientific and medical applications) between 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.
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 probability that mobile and
portable communications equipment will produce disturbances 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.
The field strength of stationary transmitters such as base stations of mobile telephones 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 ELECTROtorque Plus type 4892 is used exceeds the above
conformance level, the ELECTROtorque Plus type 4892 should be monitored to demonstrate
proper function. When unusual performance features are observed, additional measures may be
necessary such as realigning or moving the ELECTROtorque Plus type 4892.
Within the frequency range of 150 kHz to 80 MHz, the field strength should be less than 3V
eff
V/m.
Recommended safe distance between portable and mobile HF
telecommunications equipment and the ELECTROtorque Plus type 4892
The ELECTROtorque Plus type 4892 is intended for use in an electromagnetic environment in
which HF disturbances are controlled. The customer or the user of the ELECTROtorque Plus type
4892 can help prevent electromagnetic disturbances by maintaining the minimum distance
between portable and mobile HF telecommunications devices (transmitters) and the
ELECTROtorque Plus type 4892 depending on the output of the communication device as
indicated below.
Safe distance depending on the transmission frequency
m
Rated power of
the transmitter
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
3.50
7.00
For transmitters whose maximum rated power is not in the above table, the recommended 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.
NOTE: 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 electromagnetic
waves is absorbed and reflected by buildings, objects and people.
