EDAN U60 - Page 295

U60 Diagnostic Ultrasound System User Manual EMC Information
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NOTE If necessary to achieve the IMMUNITY TEST LEVEL, the distance between the transmitting
antenna and the ME EQUIPMENT or ME SYSTEM may be reduced to 1 m. The 1 m test
distance is permitted by IEC 61000-4-3.
a) For some services, only the uplink frequencies are included.
b) The carrier shall be modulated using a 50 % duty cycle square wave signal.
c) As an alternative to FM modulation, 50 % pulse modulation at 18 Hz may be used because while
it does not represent actual modulation, it would be worst case.
Recommended Separation Distances
Recommended separation distances between
portable and mobile RF communications equipment and U60
U60 is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of U60 can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and U60 as recommended below, according to the maximum output power of the
communications equipment.
Rated maximum
output power of
transmitter
(W)
Separation distance according to frequency of transmitter(m)
150 kHz to 80 MHz
Pd 2.1
80 MHz to 800 MHz
Pd 2.1
800 MHz to 2.7 GHz
Pd 3.2
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters rated at a maximum output power not listed above, the recommended separation
distance d in meters (m) can be estimated using the equation applicable to the frequency of the
transmitter, where P is the maximum output power rating of the transmitter in watts (W) according to
the transmitter manufacturer.
NOTE 1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected
by absorption and reflection from structures, objects and people.