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Mobile X-ray Unit
Operation
AND MOBILE RF COMMUNICATIONS EQUIPMENT AND THE X-RAY SYSTEM
This X-ray System is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled.
The customer or user of this X-ray System can help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and this X-ray System as recommended below,
Rated maximum output power
of transmitter
of transmitter
W
0.01
0.1
1
10
100
GMRS device (Professional Walkie-Talkie): 5 W @ 462-467 MHz
GSM / UMTS cell phone: 2 W @ 850/1700/1900 MHz
FRS device (Amateur Walkie-Talkie): 500 mW @ 462-467 MHz
WIFI / Bluetooth devices: 100 mW @ 2400-2500 MHz
DECT devices (modern cordless phones): 100mW @ 1880-1900 MHz
RFID reader (3): 10 mW @ 125-150 KHz / 13.56 MHz
RFID reader (3): 10 mW @ 902-928 MHz / 2400-2500 MHz
Station transmitter ATSC TV broadcasting: 100 kW @ 54-800 MHz
Station transmitter ATSC TV broadcasting: 100 kW @ 800-890 MHz
Station transmitter FM radio broadcasting: 100 kW @ 87.5-108 MHz
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.
NOTE 3 - - RFID chips are typically powered from the electromagnetic field, and therefore only the reader can be regarded as an RF
transmitter.
32
RECOMMENDED SEPARATION DISTANCES BETWEEN PORTABLE
(IEC 60601-1-2:2007)
according to the maximum output power of the communications equipment.
Separation distance according to frequency of transmitter
150 KHz to 80 MHz
d = 1.2 P
0.12
0.38
1.2
3.8
12
TYPICAL RF DEVICES (Worst-Case scenario)
Device: Power @ Frequency
m
80 MHz to 800 MHz
d = 1.2 P
0.12
0.38
1.2
3.8
12
800 MHz to 2.5 GHz
d = 2.3 P
0.23
0.73
Recommended distance(m)
0.12
0.23
2.3
7.3
23
2.7
3.3
0.9
0.8
0.8
380
730
380
OM-0481R1
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