Welch Allyn KleenSpec 790 Series Directions For Use Manual page 23

Directions for use
Table 4. Recommended separation distances between portable and mobile
RF communications equipment and the 790 series cordless illumination system
The 790 series cordless illumination system is intended for use in an electromagnetic environment
in which radiated RF disturbances are controlled. The customer or user of the 790 series cordless
illumination system can help prevent electromagnetic interference by maintaining a minimum
distance between portable and mobile RF communications equipment (transmitters) and the 790
series cordless illumination system as recommended below, according to the maximum output
power of the communications equipment.
Rated max. Separation distance according to frequency of transmitter (m)
output power
150 kHz to 80 MHz
of transmitter
d = (1.17)
(W)
0.01
0.1
1
10
100
For transmitters rated at a maximum output power not listed above, the recommended separation
distance d 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.
80 MHz to 800 MHz
P
d = (1.17)
0.117 0.117
0.37 0.37
1.17 1.17
3.70 3.70
11.70 11.70
Cordless illumination system
800 MHz to 2.5 GHz
P P
d = (2.33)
0.233
0.74
2.33
7.37
23.30
21