Guidance and Manufacturer's Declaration - Electromagnetic Immunity
The Expression MR400 MRI Patient Monitoring System is intended for use in the electromagnetic environment
specified below. The customer or the user of the Expression MR400 MRI Patient Monitoring System should assure that
it is used in such an environment.
IEC 60601 Test
150 KHz to 80 MHz
80 MHz to 2.5 GHz
At 80 MHz and 800 MHz, the higher frequency range applies.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects and people.
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 Expression MR400 MRI Patient Monitoring System is used exceeds the applicable RF
compliance level above, the Expression MR400 MRI Patient Monitoring System should be observed to ensure normal operation. If
abnormal performance is observed, additional measures may be necessary, such as re-orienting or relocating the Expression MR400
MRI Patient Monitoring System.
Over the frequency range 150 KHz to 80 MHz, field strengths should be less than 3 V/m.
Expression MR400 Instructions for Use Important Information 1‐11
Electromagnetic Environment - Guidance
V1 = 3 Vrms
Portable and mobile RF communications equipment
should not be used no closer to any part of the
Expression MR400 MRI Patient Monitoring System,
including cables, than the recommended separation
E1 = 3 V/m
distance calculated from the equation applicable to
the frequency of the transmitter.
Recommended separation distance
d = (3.5/V1)
d = (3.5/E1)
(80 MHz to 800 MHz)
d = (7/E1)
(800 MHz to 2.5 GHz)
Where P is the maximum output power rating of
the transmitter in watts (W) according to the
transmitter manufacturer and d is the recom-
mended separation distance in meters (m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey,
should be less than the compliance level in each
Interference may occur in the vicinity of equipment
marked with the