Zeiss Humphrey matrix User Manual page 59

Guidance and manufacturer's declaration - electromagnetic immunity
The Humphrey Matrix is intended for use in the electromagnetic environment specified below. The
customer or the user of the Humphrey Matrix should assure that is used in such an environment.
IEC 60601 test
Immunity test
Conducted RF
IEC 61000-4-6
150 kHz to 80 MHz
Radiated RF
IEC 61000-4-3
80 MHz to 2,5 GHz
NOTE 1 At 80 MHz and 800 MHz, the higher frequency 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 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 Humphrey Matrix is used and exceeds the applicable RF compliance level above, the
Humphrey Matrix should be observed to verify normal operation. If abnormal performance is
observed, additional measures may be necessary, such as reorienting or relocating the Humphrey
Matrix.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Humphrey Matrix Visual Field Instrument
Rev. D 08/21/06 PN 701692
Compliance
level level
3 Vrms
3 V
3 V/m
3 V/m
Electromagnetic environment - guidance
Portable and mobile RF communications
equipment should be used no closer to any
part of the Humphrey Matrix, including
cables, than the recommended separation
distance calculated from the equation
applicable to the frequency of the transmitter.
Recommended separation distance
d=1.17 √ P
d=1.17 √ P 80 MHz to 800 MHz
d=2.33 √ 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 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:
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