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Recommended separation distances between portable and mobile RF communications
equipment and the Welch Allyn Green Series IV, 300, 600, and 900 Exam Lights
The Welch Allyn Green Series IV, 300, 600, and 900 Exam Lights are intended for use in an electromagnetic environment
in which radiated RF disturbances are controlled. The customer or user of the Welch Allyn Green Series IV, 300, 600, and
900 Exam Lights can help prevent electromagnetic interference by maintaining a minimum distance between portable
and mobile RF communications equipment (transmitters) and the Welch Allyn Green Series IV, 300, 600, and 900 Exam
Lights as recommended below, according to the maximum output power of the communications equipment.
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz
Rated max. output
outside ISM bands
power of transmitter
(W)
0.01
0.12
0.1
0.37
1
1.17
10
3.69
100
11.67
For transmitters rated at a maximum output power not listed above, the recommended separation distanced in meters
(m) can be estimated 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 1: At 80 MHz and 800 MHz, the separation distance for 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.
Test specifications for enclosure port immunity to RF wireless communications equipment
Test frequency
a
Band
(MHz)
MHz
385
380 - 390
450
430 - 470
710
704 - 787
745
780
810
800 - 960
150 kHz to 80 MHz in
ISM bands
0.20
0.63
2.00
6.32
20.00
a
b
Service
Modulation
TETRA 400
Pulse modulation
18 Hz
GMRS 460,
c
FM
±5 kHz
deviation
FRS 460
1 kHz sine
LTE band 13, 17 Pulse modulation
217 Hz
GSM 800/900,
Pulse modulation
TETRA 800,
80 MHz to 800 MHz
800 MHz to 2.7 GHz
0.12
0.23
0.38
0.73
1.20
2.30
3.79
7.27
12.00
23.00
Maximum power
Distance (m)
(W)
b
1.8
0.3
2
0.3
0.2
0.3
b
2
0.3
b
English 5
Immunity
test level (V/
m)
27
28
9
28
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