AmpliVox 270+, Руководство по эксплуатации

Страница: 51 / 63

50
D-0126050 rev 1 - 270+ Operating Manual
Guidance and manufacturer’s declaration – electromagnetic immunity (2)
The Model 270+ Audiometer is intended for use in the electromagnetic environment specified below. The
customer or user of the Model
270+ Audiometer 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
150kHz to
80MHz
3 V/m
80MHz to
2.5GHz
3 Vrms
3 V/m
Portable and mobile RF communications equipment
should be used no closer to any part of the Model 270+
Audiometer, 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
d = 1.2√P 80MHz to 800MHz
d = 2.3√P 800MHz to 2.5GHz
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 80MHz and 800MHz, 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 270+ Audiometer is used exceeds the applicable RF compliance level above, the Model 270+
Audiometer 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 270+ Audiometer.
b Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.