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56
Humphrey Matrix Visual Field Instrument
Rev. D 08/21/06 PN 701692
Recommended separation distances between portable and mobile RF communications
equipment and the Humphrey Matrix
The Humphrey Matrix is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the Humphrey Matrix can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the Humphrey Matrix 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
150 kHz to 80 MHz
80 MHz to 800 MHz
800 MHz to 2,5 GHz
d=1.17
√
P
V1
d=1.17
√
P
E1
d=2.33
√
P
E1
0,01
0.117
0.117
0.233
0,1
0.370
0.370
0.737
1
1.170
1.170
2.330
10
3.700
3.700
7.368
100
11.700
11.700
23.300
For transmitters rated at a maximum output power not listed above, the recommended separation
distance d in metres (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.
Summary of Contents for Humphrey matrix
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