Welch Allyn REF 29400 User Manual

Page 49

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Welch Allyn OAE Hearing Screener Directions for Use 705353 Rev E

48

Electromagnetic Immunity

The REF 29400 Series OAE Hearing Screener is intended for use in the electromagnetic
environment specified below. The customer or user of the

REF 29400 Series OAE Hearing

Screener should assure that it is used in such an environment.

Immunity
Test

IEC 60601 Test
Level

Complianc
e 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






5 V/m from
30MHz to
1GHz, 7
V/m for
1GHz to 2.5
GHz; (1000
Hz. 80%
Modulated
Test Signal)

Portable and mobile RF communications equipment
should be used no closer to any part of the REF 29400
Series OAE Hearing Screener, including cables, than the
recommended separation distance calculated from the
equation applicable to the frequency of the transmitter.


Recommended separation distance

d = (1.17)






d = (1.17) 80 MHz to 800 MHz

d = (2.33) 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 REF 29400 Series OAE Hearing Screener is used
exceeds the applicable RF compliance level above, the OAE Hearing Screener should be observed to verify normal
operation. If abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating
the OAE Hearing Screener.

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