Operators Manual
Safety Information
M55-ML3-UG, Rev A
9
3.5.
Maximum RF Power Density Limits
The RF Radiation Power Density limit figure recommended by VISLINK is based upon
guideline levels published in:
•
IEEE standard C95.1 1999 - IEEE Standard for Safety Levels with respect to Human
Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz.
•
Guidelines for Limiting Exposure to Time-varying Electric, Magnetic & Electromagnetic
Fields (up to 300 GHz) published in 1998 by the Secretariat of the International
Commission on Non-Ionizing Radiation Protection (ICNIRP).
Both documents define guideline RF power density limits for "Controlled" and
"Uncontrolled" environments. An uncontrolled environment is defined as one in which the
person subjected to the RF radiation may be unaware of and has no control over the
radiation energy received. The uncontrolled environment conditions can arise, even in the
best regulated operations and for this reason the limits defined for the uncontrolled
environment have been assumed for the VISLINK recommended limit.
Documents a) and b) also show the RF power density guidelines to be frequency
dependent. Different power density / frequency characteristics are presented in the two
documents. To avoid complexity and to avoid areas of uncertainty, VISLINK recommends
the use of a single power density limit across the frequency range 100 kHz to 300 GHz.
The 1w/m² power density limit we recommend satisfies the most stringent of the
guidelines published to date.
NOTE: The IICNIRP document is freely available for download from the internet
at www.icnirp.de/emfgdl (PMLT3 file) the IEEE standard is available on loan from
Essex County Library on payment of a search fee.
