Safety Electromagnetic Compatibility
64 Lumify Ultrasound System
Philips Healthcare 4535 618 58571_A/795 * MAY 2016
Recommended Separation Distances by Transmitter Frequency
Rated Maximum Output
Power of Transmitter
(Watts)
150 kHz to 80 MHz 80 to 800 MHz 800 MHz to 2.5 GHz
0.01 0.35 m (13.8 in) 0.12 m (4.7 in) 0.23 m (9.1 in)
0.1 1.1 m (3.6 ft) 0.38 m (15 in) 0.73 m (28.7 in)
1 3.5 m (11.5 ft) 1.2 m (3.9 ft) 2.3 m (7.5 ft)
10 11 m (36.1 ft) 3.8 m (12.5 ft) 7.3 m (24 ft)
100 35 m (114.8 ft) 12 m (39.4 ft) 23 m (75.5 ft)
Ultrasound systems can be sensitive to RF interference in the transducer passband. For
example, for a 5-MHz imaging transducer, the frequency range of interference from a 3-V/m
field may be from 2 to 10 MHz and manifest itself as described in “Electromagnetic
Interference” on page 61.
As an example, if a portable transmitter has maximum radiated power of 1 W and an operating
frequency of 156 MHz, it should only be operated at distances greater than 1.2 m (3.9 ft) from
the system. Likewise, a 0.01-W Bluetooth wireless LAN device operating at 2.4 GHz should be
placed no closer than 0.24 m (9.5 in) from any part of the system.
Avoiding Electromagnetic Interference
A medical device can either generate or receive electromagnetic interference. The EMC
standards describe tests for both emitted and received interference. Emission tests deal with
interference generated by the device being tested. Philips ultrasound systems do not generate
interference based on the tests described in the referenced standards.
An ultrasound system is designed to receive signals at radio frequencies and is therefore
susceptible to interference generated by RF energy sources. Examples of other sources of
interference are medical devices, information technology products, and radio and television
transmission towers. Tracing the source of radiated interference can be a difficult task.
Customers should consider the following in an attempt to locate the source:
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