88 APPENDIX E - Electromagnetic Compatibility
SIGMA Manual Number 41018
Revision AR
Immunity – Separation Distances
WARNING: The Spectrum pump is not designed to be exposed to linear accelerator
radiation nor is it intended to be used in this manner. Exposure to
radiation of this type may cause the device to operate improperly.
Do not expose the SIGMA Spectrum to linear accelerator radiation.
Doing so may cause injury to the patient and/or damage to the
equipment.
Recommended separation distance between
portable and mobile RF communications equipment and the Spectrum
The SIGMA Model Spectrum is intended for use in an electromagnetic environment in which the RD dis-
turbances are controlled. The customer or user of the Spectrum can help prevent electromagnetic inter-
ference by maintaining a minimum distance between the portable and mobile RF communications
equipment (transmitters) and the Spectrum 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
outside ISM
bands
150 kHz to 80 MHz
in ISM bands
80 MHz to 800 MHz 800 MHz to 2.5
GHz
0.01 0.12 0.12 0.12 .23
0.1 0.38 0.38 0.38 .73
1 1.2 1.2 1.2 2.3
10 3.8 3.8 3.8 7.3
100 12 12 12 23
For transmitters rated at maximum output power not listed above, the recommended separation distance
d in meters (m) can be determined using the equation applicable to the frequency of the transmitter,
where power P is the maximum output power rating of the transmitter in watts (W) according to the trans-
mitter manufacturer.
NOTE 1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE 2 The ISM (industrial, scientific, and medical) bands between 150 kHz and 80 MHz are 6.756 MHz
to 6.795 MHz; 13.553 MHz to 13.567 MHz; 26.957 MHz to 27.283 MHz; and 40.66 MHz to 40.70 MHz.
NOTE 3 An additional factor of 10/3 is used in calculating the recommended separation distance for the
transmitters in the ISM frequency band between 150 kHz and 80 MHz and in the frequency range 80 MHz
to 2.5 GHz to decrease the likelihood that mobile/portable communications equipment could cause inter-
ference if it is inadvertently brought into patient areas.
NOTE 4 The guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
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