Electromagnetic Field (EMF) Surveys

What You Receive

Survey deliverables are defined before fieldwork so the report provides the information required for design, compliance review, troubleshooting, or mitigation planning.

Electromagnetic Field (EMF) Surveys for Exposure and Interference Analysis

At C-INTECH, we perform engineering-led electromagnetic field (EMF) surveys to measure, map, and evaluate low-frequency magnetic fields and radiofrequency conditions within buildings and operational sites. Our findings help project teams investigate interference, assess exposure conditions, identify field sources, and determine whether mitigation should be considered.

Why EMF Surveys Matter

Electromagnetic fields are not visible, but they can affect sensitive equipment, workplace exposure conditions, and the operation of critical building systems.

Identify Hidden Exposure Conditions:Measure field levels in occupied, restricted, and equipment-intensive areas where electromagnetic sources may not be immediately apparent.
Detect Interference Sources: Locate radio frequency (RF) signals and low-frequency magnetic fields that may be affecting sensitive electronics, instruments, or communication systems.
Support Exposure Evaluation:Compare measured conditions with applicable occupational, public, facility-specific, or equipment-specific criteria.
Protect Sensitive Infrastructure:
Use measured data to guide equipment placement, source control, shielding, and other practical mitigation decisions.

What Is an EMF Survey?

An EMF survey is a structured on-site measurement process used to evaluate electric, magnetic, and radiofrequency fields within a defined area. Calibrated instruments are selected according to the frequency range, suspected source, operating conditions, and purpose of the assessment.

ELF Magnetic Fields: Low-frequency magnetic field measurement around transformers, switchgear, feeders, bus ducts, electrical rooms, and other power distribution systems.
RF Fields: Measurement of radiofrequency energy associated with antennas, wireless equipment, telecommunications systems, transmitters, and external RF sources.
Broadband Spectrum Measurements: Screening across selected frequency ranges, from kilohertz through gigahertz frequencies, where required by the survey scope.
Spatial Field Mapping: Measurements at defined locations and elevations to identify field distribution, gradients, hotspots, and affected areas.
Time-Based Exposure Analysis: Review of field variation where equipment cycles, changing loads, occupancy periods, or transmitter duty cycles affect measured levels.

Types of EMF Surveys We Perform

We define each survey around the site, suspected field sources, affected equipment, applicable criteria, and decisions the project team needs to make.

Building EMF Surveys: Exposure and interference assessments for offices, residential developments, commercial properties, and other occupied buildings.
Healthcare and MRI EMF Surveys: Magnetic and RF investigations for hospitals, diagnostic imaging departments, magnetic resonance imaging (MRI) environments, and other equipment-sensitive clinical spaces.
Industrial EMF Assessments: Industrial EMF surveys around transformer rooms, substations, switchgear, bus ducts, machinery, and heavy electrical infrastructure.
RF Exposure Site Surveys: RF field measurement near antennas, telecommunications equipment, wireless infrastructure, transmitters, and RF-intensive operating environments.
Pre-Installation EMF Baseline Studies: Baseline measurements before equipment installation, renovation, tenant occupancy, electrical upgrades, or changes to surrounding infrastructure.

Our EMF Survey Process

Our process connects field measurements to the building layout, operating conditions, equipment behaviour, and applicable project requirements.

1. Initial Consultation and Risk Definition

We identify the suspected issue, affected areas, sensitive equipment, exposure concern, operating schedule, and required evaluation criteria.

2. Site Inspection

Our team reviews room layouts, occupancy patterns, electrical infrastructure, equipment locations, antennas, and other potential field sources.

3. Field Measurement

Measurements are completed using calibrated instruments selected for the required frequency range and field type. Equipment may include:

Broadband EMF meters
Frequency-selective instruments
Spectrum analysers
Three-axis gaussmeters
Electric-field probes
RF field probes
Data-logging equipment

4. Data Mapping and Analysis

Results are correlated with floor plans, equipment locations, electrical loading, source operation, and measurement position. The analysis may include:

Hotspot identification
Field distribution mapping
Exposure-zone definition
Source correlation
Frequency identification
Load-dependent field review
Time-based variation

5. Criteria and Exposure Evaluatio

Measured levels are compared with the criteria applicable to the project. These may include recognized exposure guidelines, occupational requirements, equipment limits, manufacturer siting criteria, or client-defined performance thresholds. Depending on the project, evaluation references may include:

ICNIRP guidelines
IEEE C95.1 standards
Occupational exposure requirements
Public exposure criteria
Equipment-specific limits
Project-specific EMF criteria

6. Reporting and Recommendations

C-INTECH provides an engineering report documenting the survey conditions, instruments, measurement locations, findings, applicable criteria, and recommended next steps. Recommendations may include:

Equipment relocation
Source reconfiguration
Occupancy planning
Electrical routing changes
Passive magnetic shielding
RF shielding
Active field mitigation
Additional frequency-selective testing
Post-mitigation verification

Where EMF Surveys Are Used

EMF on-site surveys support facilities where electromagnetic exposure, interference, or equipment sensitivity must be evaluated using actual operating conditions.

Healthcare Facilities

MRI suites, imaging departments, hospitals, laboratories, treatment areas, and rooms containing sensitive medical equipment.

Commercial Buildings

Offices, mixed-use developments, coworking facilities, high-rise buildings, electrical rooms, and equipment-intensive tenant spaces.

Industrial Sites

Factories, substations, transformer rooms, production areas, utility spaces, and facilities containing high-current electrical systems.

Telecom Infrastructure

Antenna sites, base stations, rooftop equipment, transmission facilities, and environments with multiple RF sources.

Research and Laboratories

Electronics laboratories, testing areas, research facilities, instrument rooms, and other EMC-sensitive environments.

What You Receive

Survey deliverables are defined before fieldwork so the report provides the information required for design, compliance review, troubleshooting, or mitigation planning.

EMF Survey Report: Scope-specific RF and low-frequency magnetic field results
Measurement Location Plans: Documented test points, elevations, and operating conditions
Magnetic Field Distribution Maps: Visual mapping of measured low-frequency field levels
Exposure Classification Zones: Defined areas based on the selected evaluation criteria
Source Identification Analysis: Correlation between elevated readings and probable field sources
Criteria Comparison Summary: Comparison against applicable exposure or project requirements
Engineering Recommendations: Practical options for source control, layout changes, shielding, or further testing
Optional Mitigation Proposal: Design support for shielding, active mitigation, or system modifications

EMF Surveys Project Experience

C-INTECH supports projects where electromagnetic accuracy, personnel exposure, equipment operation, and system stability depend on reliable field data.

MRI Room Interference Investigation

Measurement and source tracing to determine whether external electromagnetic conditions may be affecting imaging equipment or surrounding spaces.

Office Building RF Hotspot Mapping

RF measurements across occupied areas to identify field distribution and evaluate locations with elevated readings.

Industrial Transformer Field Assessment

Low-frequency magnetic field measurement around electrical infrastructure to define affected areas and assess practical mitigation options.

Data Centre Electromagnetic Noise Evaluation

On-site measurement around power distribution and critical equipment to investigate electromagnetic conditions affecting sensitive systems.

Contact Us

Share your project details and we’ll provide a precise assessment and quotation for shielding, surveys, mitigation, or power system services.

Need more help?

Get in touch with our team for expert support and tailored solutions.

Phone

(905) 472-3949

info@c-intech.com

Why Choose C-INTECH

C-INTECH combines field measurement with electromagnetic engineering, allowing findings to be interpreted in the context of equipment, infrastructure, building design, and mitigation feasibility.

Engineering-Led Diagnostics Measurements are planned and interpreted around the technical question, rather than provided as isolated meter readings.

Cross-Disciplinary EMF and RF Experience
Our work covers magnetic field analysis, RF engineering, EMC concerns, MRI environments, shielding, and active mitigation.

Analysis Through Mitigation
C-INTECH can continue from the initial survey into modelling, shielding design, installation support, and verification testing when required.

Critical-Environment Experience
We support healthcare, research, government, industrial, commercial, telecommunications, and data centre environments.

25+ Years and 500+ Projects
Our recommendations draw on field experience across electromagnetic analysis, shielding, installation, testing, and operational troubleshooting.

SERVICES

Related Services

A survey may identify the need for further analysis, design coordination, shielding, or verification.

Magnetic Field
Analysis Studies

FEA-based modeling to quantify EMF levels from internal and external sources

ELF Architectural
Magnetic Shielding

Custom-engineered shielding design and installation for low-frequency magnetic fields

RF Shielded Enclosures

Custom modular enclosures providing 80-120 dB attenuation across broad RF frequencies

MRI EMF
Interference Studies

Compliance verification and field modeling for MRI siting requirements and surrounding environments

MRI Cabins
(RF Shielded Rooms)

Design and specification of high-performance MRI RF shielded cabins through trusted partners

FAQ's

What is an electromagnetic field survey?

An electromagnetic field survey measures electric, magnetic, or radiofrequency field conditions within a defined site. The survey can be used to investigate exposure, equipment interference, suspected field sources, or baseline conditions before a project change. The measurement scope depends on the frequencies and sources relevant to the site.

What equipment is used for EMF testing?

Equipment may include broadband EMF meters, spectrum analyzers, RF probes, electric-field probes, three-axis gaussmeters, and data loggers. Instruments are selected according to the frequency range, expected field strength, required sensitivity, and survey objective. Calibration status and instrument limitations should be documented in the report.

What is the difference between RF and ELF fields?

Extremely low-frequency (ELF) fields are low-frequency fields commonly associated with power systems, transformers, switchgear, feeders, and other electrical infrastructure. RF fields occur at higher frequencies and are associated with antennas, wireless communication, broadcasting, radar, and telecommunications equipment. Different instruments, measurement methods, and evaluation criteria are generally required for each.

Are EMF levels regulated in buildings?

Requirements depend on the jurisdiction, type of facility, source, frequency range, and whether public or occupational exposure is being assessed. Some projects are governed by legislation, while others use recognized guidelines, equipment limits, or client-defined criteria. We confirm the appropriate basis of evaluation as part of the survey scope.

How accurate are EMF measurements?

Accuracy depends on instrument selection, calibration, frequency response, probe orientation, measurement position, environmental conditions, and source operation. A technically sound survey documents these factors and uses repeatable measurement procedures. Where fields vary over time, additional logging or testing under different operating conditions may be required.

How long does an EMF survey take?

The schedule depends on the size of the site, number of measurement locations, frequency ranges, operating conditions, and reporting requirements. A focused equipment-area survey may require less field time than a multi-floor building or industrial assessment. Site access and the need to test different load conditions can also affect the duration.

Can EMF sources be reduced or eliminated?

Many field conditions can be reduced through source control, equipment relocation, revised conductor routing, increased separation, passive shielding, RF shielding, or active mitigation. Complete elimination may not be practical where the source is necessary to facility operations or located outside the property. The recommended approach depends on the source, frequency, required reduction, and site constraints.

Do EMF surveys include mitigation recommendations?

Yes, mitigation recommendations can be included when requested and supported by the survey findings. Recommendations may range from operational or layout changes to additional modelling, shielding, or active mitigation. Detailed design work may require a separate engineering scope after the source and required performance have been confirmed.

Why Choose us

Real People. Real Work. Real Rewards.

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