19
S L I T L A M P b y K E E L E R
www.keeler.co.uk
guidance and manufacturer’s declaration – electromagnetic immunity
The Keeler Slit Lamp is intended for use in the electromagnetic
environment specified below. The customer or user 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 Keeler Slit Lamp, including cables, than the
recommended separation distances calculated
from the equation applicable to the frequency of
the transmitter.
Recommended separation distance
Conducted RF
IEC 61000-4-6
3 Vrms
3 V
d = 1.2 √ p
Radiated RF
IEC 61000-4-3
3 V/m
80MHz to
2.5GHz
3 V/m
d = 1.2 √ p 80MHz to 800 MHz
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 metres(m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey¹,
should be less than the compliance level in each
frequency range.²
Interference may occur in the vicinity of
equipment marked with the this symbol.
Note: At 80MHz and 800MHz, the higher frequency range applies. These guide lines may not apply in all situations.
Electromagnetic propagation is affected by absorption and reflection from structures, objects and people.
1
Field strengths from fixed transmitters, such as base stations ( 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 Keeler Slit Lamp is used exceeds the applicable RF compliance
level above, the Keeler Slit Lamp should be observed to verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as re-orientating or relocating the Keeler Slit Lamp.
2
Over the frequency range 150kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between and mobile RF
communications equipment and the Keeler Slit Lamp
The Keeler Slit Lamp is intended for the use in an electromagnetic
environment in which radiated RF disturbances are controlled. The
customer or the user of the Keeler Slit Lamp can help prevent
electromagnetic interference by maintaining a minimum distance between
mobile RF communications equipment (transmitters) and the Keeler Slit
Lamp as recommended below, according to the maximum output power of
the communications equipment.
Rated maximum output
power of transmitter (W)
Separation distance according to frequency of transmitter (m)
50 kHz to 80MHz
d = 1.2√ p
80MHz to 800MHz
d = 1.2√ p
800MHz to 2.5GHz
d = 2.3√ p
0.01
0.12
0.12
0.23
0.01
0.37
0.37
0.74
1
1.2
1.2
2.3
10
3.7
3.7
7.4
100
12
12
23
For transmitters rated at a maximum output power not listed above, the
recommended separation distance d in metres (m) can be determined using
the equation applicable to the frequency of the transmitter, where p is the
maximum output power rating of the transmitter in watts (W) according to
the transmitter manufacturer.
Note: At 80MHz and 800MHz, the separation distance for the higher frequency applies.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection
from structures, objects and people.
15.3 electromagnetic immunity
15.4 recommended Safe diStanceS
Содержание Slit Lamp H Series
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