Electromagnetic SurveysElectromagnetic site surveys are used to evaluate the electromagnetic environment at specific locations and including measurements of frequency, field strength and other parameters. Frequencies of interest may include Radio Frequencies (RF) used for radio-communications or industrial, scientific and medical applications. Other surveys may involve measurements of electrical or magnetic fields at frequencies associated with electrical power at 50 Hz or 60 Hz (sometimes referred to as Extremely Low Frequencies or ELF). Electromagnetic site surveys may be required for many reasons including:
- Identifying sources of electrical interference problems.
- Determining whether a site is suitable for locating sensitive electronic equipment or instruments.
- Quantifying shielding requirements required to solve electromagnetic interference problems.
- Investigation of electromagnetic field or RF exposure levels for health and safety assessments.
Radio Frequency (RF) surveysRadio Frequency surveys include measurements of signal strengths which may be at frequencies from a few kHz up to many GHz. This covers the frequency spectrum of common radio communication equipment, as well as frequencies used in Industrial, Scientific and Medical (ISM) applications. The type of signals that need to be evaluated will depend on the purpose of the survey, so each survey is uniquely tailored to your requirements. We offer measurements covering a wide frequency and dynamic range and can also monitor signals that vary with time. Reasons for requiring measurements at radio frequencies are varied but include:
- Identifying the source of radio interference problems.
- Measurements at the planning stage of construction projects to quantify the electromagnetic environment and identify potential problems early in development.
- Assessment of a particular site or environment prior to installation of sensitive equipment.
- Measurement of workplace or residential environments for assessment against ICNIRP and similar guidelines related to the health effects from exposure to electromagnetic fields.
- Assessing electromagnetic fields which may cause interfere with implantable medical devices (e.g. pacemakers).
Power frequency and ELF surveysMeasurements of Extremely Low Frequency (ELF) fields are often performed in order to quantify electric and magnetic fields from electrical installations. These fields arise from the transmission and use of electricity at AC power frequencies (typically 50 Hz or 60 Hz). Relatively high field levels can be measured in the vicinity of power distribution equipment (e.g. high voltage power lines, substation transformers and electrical switchgear) as well as electrical motors and other high power electrical equipment, particularly in industrial environments. These power frequency electric and magnetic fields may interfere with sensitive electrical and electronic equipment. Human exposure may also be of concern due to health effects resulting from exposure to high levels of power frequency electric and magnetic field. Power frequency surveys are often performed during construction projects to assess the potential impact of electric and magnetic fields from power distribution systems and other electrical installations. We also provide measurements to assess electromagnetic field exposure against ICNIRP guidelines including exposure to power frequency magnetic and electric fields from electrical cables, pylons, substations and other electrical distribution infrastructure. Contact us to discuss your electromagnetic survey requirements.
Electromagnetic site surveys – Key facts:
- Electromagnetic site surveys are used as a method of evaluating the electromagnetic environment at a particular location.
- Site surveys may include measurements of power frequencies (ELF) or radio frequencies (RF). Commonly measured parameters include frequency and field strength.
- Electromagnetic surveys can give an overview of the environment at a particular time or could involve monitoring to investigate how field levels change over an extended time period.
- Reasons for requiring an electromagnetic survey are varied but include evaluation of field levels for health and safety purposes as well as investigations of electrical and radio interference issues.
- We offer Radio Frequency (RF) surveys covering frequencies from a few kHz up to 40 GHz and beyond
- Surveys of Extremely Low Frequencies (ELF) often focus on measurements of electric or magnetic fields at power frequencies (e.g. 50 or 60 Hz)
- We perform electromagnetic surveys on a wide variety of sites, both indoor and outdoor including construction sites, industrial environments and residential locations.