Welch Allyn Spot VS100 Directions For Use Manual page 39

Directions for Use
Conducted RF
EN 61000-4-6
Radiated RF
EN 61000-4-3
Surge EN 61000-4-5
The field intensity of the fixed RF transmitters, as checked in an electromagnetic investigation of the locus, should be less than the conformity level for
each range of frequency.
It is possible to have interference near devices marked with the symbol:
Recommended separation distance between portable or mobile devices for radio communication and the device
The vision screener is manufactured to work in an electromagnetic environment in which the radiated RF disturbances are controlled. The operator or
user of the device could prevent electromagnetic interferences by assuring a minimal distance between the portable or mobile RF communication
devices (transmitter) and the device as recommended in the chart below, in respect of the output maximum power of the radio-communication devices.
Output maximum frequency (m)
nominal power of the transmitter
(W)
0.01
0.1
1
10
100
For the transmitter with output maximum nominal power not reported above, the separation distance d in meters can be calculated using the applicable
equation at the frequency of the transmitter, where P is the output maximum nominal power of the transmitter in Watts specified by the transmitter
manufacturer.
Notes: (1) At 80 MHz and 800 MHz it is applicable the higher frequency range.
(2) This line guide could not be applicable in every circumstance. The electromagnetic propagation is affected by the absorption and the reflection of
structures, people or objects.
3 Veff from 150kHz to 80MHz
3 V/m from 80MHz to 2.5GHz
Differential mode: ±1 kV
Common mode: ±2kV
Separation distance at the transmitter Output maximum frequency (m)
from 150kHz to 80MHz
D= 1,2 x ÖP
0.12
0.38
1.2
3.8
12
3 Veff from 150kHz to 80MHz
3 V/m from 80MHz to 2.5GHz
Differential mode: ±1 kV
Common mode: ±2kV
from 80MHz to 800MHz
D= 1,2 x ÖP
0.12
0.38
1.2
3.8
12
Specifications
The portable and mobile devices with RF
communication shouldn't be used near any part of the
device, including cables, except when they follow the
recommended safety distance for separation,
calculated with the equation applicable to the
frequency of the transmitter.
Recommended safety distance for separation:
D= 1,2 x ?P from 150kHz to 80MHz
D= 1,2 x ?P from 80MHz to 800MHz
D= 2,3 x ?P from 800MHz to 2,5GHz
Where P is the nominal maximum power of the
transmitter output expressed in Watts (W) as
specified by the transmitter manufacturer and d is
the recommended separation distance expressed in
meters (m).
from 800MHz to 2,5GHz
D= 2,3 x ÖP
0.23
0.73
2.3
7.3
23
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