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3M™ Bair Hugger™ Warming Unit Model 775 – Operator’s Manual
Guidance and manufacturer’s declaration – electromagnetic immunity
The Model 775 warming unit is intended for use in the electromagnetic environment specified below. The customer or the user of the Model
775 warming should assure that it is used in such an environment.
Immunity Test
IEC 60601 test level
Compliance
level
Electromagnetic environment - guidance
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2,5 GHz
3 Vrms
3 V/m
Portable and mobile RF communications equipment should be used no
closer to any part of the Model 775 warming unit, including cables, than
the recommended separation distance calculated from the equation
applicable to the frequency of the transmitter.
Recommended separation distance
d = 1.2
d = 1.2 80 MHz to 800 MHz
d = 2.3 800 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 meters (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 Model 775 warming unit is used exceeds the applicable RF compliance level above, the Model 775 warming unit should be observed to
verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as re-orienting or relocating the
Model 775 warming unit.
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 Model 775 warming unit
The Model 775 warming unit is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled.
The customer or the user of the Model 775 warming unit can help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and the Model 775 warming unit 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
d = 1.2
80 MHz to 800 MHz
d = 1.2
800 MHz to 2,5 GHz
d = 2.3
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 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.
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.
