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.
Nominal power of
the transmitter (W)
Separation distance at the transmitter Output maximum frequency (m)
from 150 kHz to 80
MHz
d= 1.2 x
from 80 MHz to 800
MHz
d= 1.2 x
800 MHz to 2.5 GHz
d= 2.3 x
0.01 0.12 0.12 0.23
0.1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
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.
Note 1: At 80 MHz and 800 MHz it is applicable the higher frequency range.
Note 2: This guideline may not be applicable in every circumstance. The electromagnetic propagation is affected by
absorption and reflection of structures, people or objects.
FCC compliance statement
This device complies with part 15 of the FCC Rules. Operation is subject to the following
two conditions:
•
This device may not cause harmful interference.
• This device must accept any interference received, including interference that may
cause undesired operation.
Note This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of FCC Rules. These limits are
designed to provide reasonable protection against harmful interference
when the equipment is operated in any environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.
WARNING Changes or modifications not expressly approved by Welch
Allyn could void the user’s authority to operate the equipment.
50 Specifications Welch Allyn® Spot™ Vision Screener Model VS100
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