6
HD11 XE Getting Started
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135
Device Standards
Recommended Separation Distance
Table 6-8 provides guidance on the distances any radio frequency (RF) transmit-
ting equipment should be kept away from the ultrasound system to reduce the
risk of interference with the imaging system. Portable and mobile RF communica-
tions 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 trans-
mitters, as determined by an electromagnetic site survey
1
should be less than the
compliance level in each frequency range as noted in Table 6-6. Interference may
occur in the vicinity of equipment marked with the following symbol:
NOTES
• For transmitters rated at a maximum output power not listed in Table 6-8, 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 maxi-
mum 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.
• The recommended separation distance guidelines in Table 6-8 may not apply
to all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects, and people.
Table 6-8, in conjunction with Table 6-6, provides guidance on conducted and
radiated interference from portable and fixed RF transmitting equipment.
The conducted RF test level is 3 V and the ultrasound system has a compliance
level of 0.01 V.
1. Field strengths from fixed transmitters such as base stations for radio (cellular/cordless) tele-
phones and land mobile radios, amateur radio, AM and RM radio broadcast, and TV broadcast
cannot be predicted theoretically with accuracy. To assess the electromagnetic environment
due to 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 compli-
ance level in Table 6-6, the system should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as reorienting or relo-
cating the system.
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