EMF measurement surveys are usually conducted
for one of the following applications:
Evaluation of a commercial space where equipment is being adversely
affected by building electrical systems or other interference (EMI) sources, or where concern about
human exposure exists.
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 residence from an exposure
Assessment of human exposure to industrial RF sources
such as heat sealers, dielectric seam welders, induction heating equipment, or microwave dryers.
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, and processed
to produce multicolor 2-Dimensional and 3-Dimensional presentations of field strength. We use top quality
professional equipment, calibrated periodically by the manufacturer, to ensure the highest degree of accuracy.
Radio frequency, microwave, and cell site surveys are discussed on
another page of this site: RF Exposure Measurements.
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.
Each professional 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 evaluation of 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.