3M Littmann 3200 Manual page 22

Declaration – electromagnetic immunity - continued
The 3M™ Littmann® Electronic Stethoscope Model 3200, is intended for use in the electromagnetic environment
specifi ed below. The customer or the user of Model 3200 should assure that it is used in such an environment.
Immunity test IEC 60601 test level
Conducted RF 3 Vrms
IEC 61000-4-6 150 kHz to 80 MHz
Radiated RF 3 V/m
IEC 61000-4-3 80 MHz to 2.5 GHz
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
refl ection from structures, objects and people.
a
Field strengths from fi xed 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 fi xed RF transmitters, an electromagnetic site survey should be
considered. If the measured fi eld strength in the location in which the Model 3200 is used exceeds the applicable RF
compliance level above, the Model 3200 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 3200.
b
Over the frequency range 150 kHz to 80 MHz, fi eld strengths should be less than 3 V/m.
Compliance level Electromagnetic environment –guidance
Portable and mobile RF communications equipment
should be used no closer to any part of the Model
3200, including cables, than the recommended
separation distance calculated from the equation
applicable to the frequency of the transmitter.
Recommended separation distance:
d = 1,2 √ P
Not applicable
d = 1,2 √ P 80 MHz to 800 MHz
3 V/m
d = 2,3 √ P 800 MHz to 2,5 GHz
80 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 fi xed RF transmitters, as
determined by an electromagnetic site survey,
be less than the compliance level in each frequency
range,
Interference may occur in the vicinity of
equipment marked with the following symbol:
21
b
a
should