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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
59
Guidance and manufacturer’s declaration – electromagnetic immunity
The MR850 is intended for use in the electromagnetic environment specified below. The customer or the user of the MR850 should
assure that it is used in such an environment.
Immunity test IEC 60601 test level Compliance
level
Electromagnetic environment
– guidance
Portable and mobile RF communications equipment should be used
no closer to any part of the MR850 including cables, than the
recommended separation distance calculated from the equation
applicable to the frequency of the transmitter.
Recommended separation distance
Conducted RF
IEC 61000-4-6
3 Vrms
150 kHz to 80 MHz
3 V
d = 1,2√P
Radiated RF
IEC 61000-4-3
3 V/m
80 MHz to 2,5 GHz
3 V/m
d = 1,2√P 80 MHz to 800 MHz
d = 2,3√P 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
recommended separation distance in metres (m).
Field strengths from fixed RF transmitters, as determined by an
electromagnetic site survey
a
,
should be less than the compliance
level in each frequency range
b
.
Interference may occur in the vicinity of equipment marked with the
following symbol:
NOTE 1 At 80 MHz and 800 MHz, 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.
a
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 MR850 is used exceeds the applicable RF compliance level above, the MR850 should be
observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as
reorienting or relocating the MR850.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications equipment
and the MR850
The MR850 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer
or the user of the MR850 can help prevent electromagnetic interference by maintaining a minimum distance between portable and
mobile RF communications equipment (transmitters) and the MR850 as recommended below, according to the maximum output
power of the communications equipment.
Separation distance according to frequency of transmitter (m)
Rated maximum output
power of transmitter (W)
150 kHz to 80 MHz
D = 1,2√P
80 MHz to 800 MHz
D = 1,2√P
800 MHz to 2,5 GHz
D = 2,3√P
0,01 0,12 0,12 0,23
0,1 0,38 0,38 0,73
1 1,2 1,2 2,3
10 3,8 3,8 7,3
100 12 12 23
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in metres (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.