Recommended Separation Distance
The following table provides recommended separation distances, which are guidelines on the
distances that any RF transmitting equipment should be kept away from the ultrasound system
to reduce the risk of interference with the system. Portable and mobile RF communications
equipment should be used no closer to any part of the system, including cables, than the
recommended separation distance calculated from the equation applicable to the frequency of
the transmitter. Field strengths from fixed RF transmitters, as determined by an
electromagnetic site survey, should be less than the compliance level in each frequency range
as noted in the table. Interference may occur in the vicinity of equipment marked with the
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless)
telephones and land mobile radios, amateur radio, AM and FM radio broadcast, and TV
broadcast, cannot be predicted theoretically with accuracy. To assess the electromagnetic
environment due to fixed RF transmitters, an electromagnetic site survey should be considered.
If the measured field strength in the location in which the system is used exceeds the applicable
RF compliance level in the table, the system should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting
or relocating the system.
For transmitters rated at a maximum output power not listed in the following table, 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.
At 80 MHz and 800 MHz, the higher frequency range applies.
EPIQ 7 User Manual 4535 617 25341