EMF measurement surveys are usually conducted
for one of the following applications:
Evaluation of a commercial space where computer monitors or
other equipment are being adversely affected by building electrical systems or other
interference (EMI) sources.
Land Use Planning - Site assessment of an open tract to
evaluate the impact of power lines or adjacent TV, radio, and cell site transmitters, and to provide
guidance in the placement of new construction.
Evaluation of a home or commercial building from an exposure
assessment perspective.
Assessment of human exposure to industrial RF sources
such as heat sealers, dielectric seam welders, induction heating equipment, or microwave dryers.
The fully documented reports that we furnish
our clients are an important part of each survey, and provide a point of reference
for understanding the significance of measurement data. Each report references
applicable exposure standards and equipment interference thresholds. The ultimate
goal of our surveys is to place you in a position to make a responsible and informed
decision about the area under evaluation, and to understand the options available
for field remediation.
For power frequency magnetic fields, different types of
survey are offered, depending upon the client's needs. Mapped surveys are suitable for
most commercial applications and assessment of outdoor areas near power lines. Data is recorded
by a sampling gaussmeter at 1 foot intervals across the surveyed space, and processed to
produce multicolor 2-Dimensional and 3-Dimensional presentations of field strength.
Radio frequency, microwave, and cell site surveys involve
the use of isotropic broadband survey instruments, in compliance with established measurement
protocols. This is supplemented with high sensitivity, directional equipment for source identification and
extremely low level readings. RF measurements and cell tower surveys are discussed
in depth on another page of this site.
Each EMF survey includes a full identification of the source
or sources of elevated magnetic fields, radio frequency fields, or electromagnetic interference (EMI).
This often requires measurement of ground currents, feeder imbalance, neutral current diversion, and
other net current sources. An analysis of electrical wiring and
grounding systems from the standpoint of field production is an essential
part of a comprehensive measurement survey. The power control and distribution equipment in commercial
buildings can also produce extremely high field intensities even when circuits are balanced and operating
properly. Some EMI investigations involve RFI (radio frequency interference) measurements as well. This
information is factored into our field management recommendations. The experience gained from hundreds of
surveys over the years is an important part of the quality that we offer you.
