3M Littmann 3000 Manual - Página 6

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Table 204

Declaration – Electromagnetic Immunity (Continued)

The 3M Littmann® Electronic Stethoscope, Model 3000, is intended for use in the electromagnetic environment specified below.

The customer or the user of Model 3000 should assure that it is used in such an environment.

Immunity test IEC 60601 test level

Compliance level

Conducted RF 3 Vrms

Not applicable

IEC 61000-4-6 150 kHz to 80 MHz

Radiated RF

3 V/m

IEC 61000-4-3 80 MHz to 2.5 GHz

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 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 Model 3000 is used exceeds the applicable RF compliance level above, the Model 3000

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 3000.

Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.

Electromagnetic environment –guidance

Portable and mobile RF communications equipment should be used

no closer to any part of the Model 3000, 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 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 meters (m).

Field strengths from fixed RF transmitters, as determined by an

electromagnetic site survey,

should be less than the compliance

level in each frequency range,

Interference may occur in the

vicinity of equipment marked with the

following symbol:

Table 206

Recommended Separation Distances Between Portable and Mobile RF Communications Equipment and the 3M™ Littmann®

Electronic Stethoscope Model 3000

The Model 3000 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The

customer or the user of the Model 3000 can help prevent electromagnetic interference by maintaining a minimum distance between

portable and mobile RF communications equipment (transmitters) and the Model 3000 as recommended below, according to the

maximum output of the communications equipment.

Rated maximum output

Separation distance according to frequency of transmitters, d [m]

power of transmitter, P [W]

150 kHz to 80 MHz

0.01

0.12

0.1

0.38

1.2

3.8

100

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.

80 Mz to 800 MHz

800 MHz to 2,5 GHz

d = 1.2

d = 2.3

0.12

0.23

0.38

0.73

1.2

2.3

3.8

7.3