Leica M844 User Manual page 55

Table 204 from EN 60601-1-2:2001
Guidance and manufacturer's declaration – electromagnetic immunity
The Leica M820 and Leica M844 surgical microscopes are intended for use in the electromagnetic environment specified below.
The customer or the user of the Leica M820 and Leica M844 surgical microscopes should assure that it is used in
such an environment.
Immunity test
Conducted HF –
equipment
IEC 61000-4-3
Radiated HF –
IEC 61000-4-3
Note 1:
Note 2:
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 HF transmitters, an electromagnetic site survey should be considered. If the
measured field strength in the location in which the Leica M820 and Leica M844 surgical microscopes are used exceeds the
applicable HF compliance level above, the Leica M820 and Leica M844 surgical microscopes should be observed to verify
normal operation. If abnormal performance is observed, additional measures may be necessary, such as reorienting or
relocating the Leica M820 and Leica M844 surgical microscopes.
b Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
IEC 60601 test level Compliance level
3 V 3 V
eff
150 kHz to 80 MHz
3 V/m 3 V/m
80 MHz to 2.5 GHz
At 80 MHz, the higher frequency range applies.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
Leica M844 – Leica M820 / Ref. 10 713 294 / Version I
Electromagnetic environment – guidance
Portable and mobile HF communications
should be used no closer to any part of the
Leica M820 and Leica M844 surgical
microscopes, including cables, than the
recommended separation distance
calculated from the equation applicable to
the frequency of the transmitter.
Recommended separation distance:
d = 2.4 P
eff
for 150 kHz to 80 MHz
d= 2.4 P
for 80 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 HF transmitters,
as determined by an electromagnetic site
survey, should be less than the compliance
level in each frequency range. Interference
may occur in the vicinity of equipment
marked with the following symbol:
Guidance and manufacturer's declaration
53