Canon TX-20 Full Auto Tonometer User Manual
Page 93
Appendix
93
Guidance and Manufacturer’s Declaration for Electromagnetic Immunity
The TX-20 is intended for use in the electromagnetic environment specified below.
The customer or the user of the TX-20 should assure that it is used in such an environment.
Immunity Test
IEC 60601
Test Level
Compliance Level
Electromagnetic Environment – Guidance
Conducted RF
EN IEC 61000-4-6
Radiated RF
EN IEC 61000-4-3
3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2.5 GHz
3 Vrms
3 V/m
Portable and mobile RF communications
equipment should be used no closer to any
part of the TX-20, including cables, than the
recommended separation distance calculated
from the equation applicable to the frequency
of the transmitter
Recommended Separation Distances
d = 1.2 √P
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
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 TX-20 is used exceeds the applicable RF compliance level
above, the TX-20 should be observed to verify normal operation. If abnormal performance is observed, additional
measures may be necessary, such as reorienting or relocating the TX-20.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
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