Welch Allyn MicroTymp 3 portable tympanometric instrument - User Manual - Manual (Page 70)

70 Specifications Welch Allyn MicroTymp3 portable tympanometric instrument
Electromagnetic Immunity
The MicroTymp3 is intended for use in the electromagnetic environment specified below. The customer or user of the MicroTymp3 should assure
that it is used in such an environment.
Immunity Test IEC 60601
Test Level Compliance
Level Electromagnetic Environment - Guidance
Portable and mobile RF communications equipment should be used no closer
to any part of the MicroTymp3, including cables, than the recommended
separation distance calculated from the equation applicable to the frequency
of the transmitter.
Recommended separation distance
Conducted RF
IEC 61000-4-6 3 Vrms
150 kHz to 80 MHz V1 = 3 Vrms d = (1.17)
Radiated RF
IEC 61000-4-3 3 V/m
80 MHz to 2.5 GHz E1 = 3 V/m 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 metres (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
MicroTymp3 is used exceeds the applicable RF compliance level above, the MicroTymp3 should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating the MicroTymp3.
b Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
P
P
P