Question? Just ask us!
Free Encyclopedia of Building & Environmental Inspection, Testing, Diagnosis, Repair
InspectAPedia ® Home
ENVIRONMENTAL HAZARDS - INSPECT, TEST, REMEDY
AIR FILTERING STRATEGIES
AIR POLLUTANTS, COMMON INDOOR
AIR QUALITY IMPROVEMENT STRATEGIES
AIRBORNE PARTICLE ANALYSIS METHODS
ALLERGEN TESTS for BUILDINGS
ANIMAL ODORS IN BUILDINGS
ASBESTOS IDENTIFICATION IN BUILDINGS
ATTORNEYS and EXPERT WITNESSES
BACKDRAFTING HEATING EQUIPMENT
BIBLIOGAPHY for ENVIRONMENTAL HEALTH, MOLD, IAQ
BLACK MOLD, HARMLESS COSMETIC
BLACK MOLD, TOXIC & ALLERGENIC
BOOKSTORE - ENVIRONMENTAL
BUILDING SAFETY HAZARDS GUIDE
Cadmium in the home
CARBON MONOXIDE - CO
Carbon Nanotube Hazards
CARPETING & INDOOR AIR QUALITY
CHEMICAL CONTAMINANTS in WATER
CHINESE DRYWALL HAZARDSDS
COMBUSTION PRODUCTS & IAQ
CPSC Indoor Air Pollution Book Online Copy
DIRECTORY of MOLD / ENVIRONMENTAL EXPERTS
Diethylstilbestrol - DES
DUST SAMPLING PROCEDURE
EMERGENCY RESPONSE, IAQ, GAS, MOLD
EMF ELECTROMAGNETIC FIELDS & HUMAN EXPOSURE
ENVIRO-SCARE - PUBLIC FEAR CYCLES
ENDOCRINE DISRUPTORS at BUILDINGS
FEAR of MOLD - MYCOPHOBIA
FLAME COLOR, BLUE vs YELLOW COMBUSTION
FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUP
FLOOR TILE ASBESTOS IDENTIFICATION
GAS EXPOSURE EFFECTS, TOXIC
GAS EXPOSURE LIMITS & STANDARDS
HEATING OIL EXPOSURE HAZARDS, LIMITS
HOME HEATING SAFETY
INDOOR AIR QUALITY & HOUSE TIGHTNESS
INDOOR AIR QUALITY IMPROVEMENT GUIDE
LEAD POISONING HAZARDS GUIDE
Legionella Legionnaires' Diseaset
LIGHT, GUIDE to FORENSIC USE
LP & Natural Gas Safety Hazards
METHANE GAS SOURCES
MSDS Material Safety Data Sheets
MYCOPHOBIA, STAINS MISTAKEN for MOLD
MYCOTOXIN EFFECTS of MOLD EXPOSURE
ODORS GASES SMELLS, DIAGNOSIS & CURE
OIL, HEATING, EXPOSURE HAZARDS, LIMITS
PARTICLE SIZES & IAQ
Particulates & Allergens Indoors
Pesticide Exposure Hazards
PET ALLERGENS / PET DANDER
PLASTIC ODORS-SCREENS, SIDING
PLUMBING SYSTEM ODORS
PVC - VINYL BUILDING PRODUCTS
RADON HAZARD TESTS & MITIGATION
SAFETY HAZARDS GUIDE
SAFETY HAZARDS & INSPECTIONS
SEPTIC METHANE GAS
SEWAGE BACKUP TEST & CLEANUP
SICK HOUSE IAQ QUESTIONNAIRE
STAIN DIAGNOSIS on BUILDING EXTERIORS
STAIN DIAGNOSIS on BUILDING INTERIORS
UFFI UREA FORMALDEHYDE FOAM INSULATION
VENTILATION in BUILDINGS
VINYL CHLORIDE HEALTH INFO
VINYL Siding or PLASTIC Window ODORS
Volatile Organic Compounds VOCs
WATER ODORS, CAUSE CURE
WATER TESTS, CONTAMINANTS, TREATMENT
WORLD TRADE CENTER 9-11 DUST PHOTOS
EMF exposure field strength measurements, exact procedure: this paper discusses a recommended procedure for performing electromagnetic field (EMF) or electro-magnetic radiation EMR measurements either by engaging a professional or by consumers using low-cost instruments which measure EMF exposure levels in gauss or milligauss. We discusses sources of error and variation in EMF measurements and we review and make suggestions for using several low-cost EMF measurement devices to determine the instantaneous electromagnetic field exposure.
Green links show where you are. © Copyright 2013 InspectAPedia.com, All Rights Reserved.
Steps in A Recommended Electromagnetic Field Measurement Procedure - How to make Outdoor & Indoor EMF Measurements
We have documented a proposed procedure for making site surveys of electromagnetic field strength in order to improve the accuracy and repeatability of such measurements. We welcome critique and suggestions for this procedure. Contact Us with criticism.
As we explained earlier:
However if the inspector agrees to a detailed site survey we recommend spot checks in every room as well as at obvious common interior targets of interest (such as an electrical device which is normally kept on and which is close to the head of a bed (clocks).
You will observe that while there may be a strong field close to a clock, the field will fall off to undetectable in 2 feet or so.
Toasters, coffee makers, electric irons, crockpots, and similar electrical appliances are an EMF Enviro-Scare "red-herring" and need not be measured unless the client indicates that someone sleeps with their head in or on the toaster and that it's kept on for long periods of time each day.
Local power distribution systems, electric meter buses which may produce a field which is further distributed by building plumbing or wiring
Special high-amp equipment such as X-ray machines, computer equipment, compressors
Given the ease with which electrical components within a building can be relocated or modified, field inspectors are strongly warned to absolutely refuse to permit clients to assert that the sample measurements made are a comprehensive or exhaustive study of a property.
Health professionals, epidemiological experts, and in the case of EMF, electrical engineers can offer competent, expert advice which should be considered before any costly or risky actions are taken regarding this or other environmental topics.
This information is has not been sanctioned nor technically reviewed by the American Society of Home Inspectors.
Use it at your own risk.
Document date, time, location, weather conditions (hot means air conditioners are running and load may be higher; time means it is at least theoretically possible to correlate the measurement results with actual load data if the power company would provide it)
Document distance from measurement location to suspected source of EMF and identify that source
Document any reports of medical anomalies (if anyone volunteers such information or if your procedure or study permits its collection)
See WORKPLACE EXPOSURE to Electromagnetic Fields for information about exposure to electromagnetic fields in the workplace.
Please see WORKSHEET for EMF MEASUREMENTS - Example for a sample worksheet that collects EMF measurements and summarizes the results.
Instead of contacting us with a request to perform EMF Electromagnetic or RF Radio Frequency Field Strength measurements, in most cases it is more economical and convenient for a property owner to purchase their own instrument, making measurements under varying conditions.
See Recommended EMF Measurement Procedure for details of how to collect EMF measurement data.
See Evaluation of Low-Cost EMF Instruments This article describes several low-cost and reasonably accurate EMF measurement devices that are readily available.
See Radio Frequency RF Detection Meters This article describes several low-cost and accurate radio frequency or RF detection and measurement devices suitable for radio, TV, cellphone, microwave, and similar signals.
Green link shows where you are in this article series.
Frequently Asked Questions (FAQs)
Question: information on how I can test a house for electromagnetic waves
I'm considering buying a house next to high tension wires please help me with information on how I can test the house for electromagnetic waves. - F.R. 6/1/2013
A competent onsite inspection by an expert usually finds a range of hazards, some of which may be more immediate and severe than possible risks from electromagnetic fields, so be sure you aren't distracted from those. That said, here are some things to consider:
You can probably buy a decent quality EMF/EMR meter and make your own field measurements for a fraction of the cost of bringing in a hired professional, with the added advantage of making multiple measurements since over time field strengths vary considerably depending on the load on the power line.
You can eschew measurement entirely and still estimate both the possible impact on real estate re-sale (price or time on market due to some buyers' fear level) and possible exposure levels to EMF, independent of any actual health risk assessment (ENVIRO-SCARE - PUBLIC FEAR CYCLES ) , by determining the name, owner, and transmission line voltage levels of the power lines near your building along with simple on-the-ground measurements of the distances involved.
There is ample data including in some of our articles, on the relationship between field strength and distance from the source (Distance from the EMF Source Affects Strength). Since actual electrical field strength varies with load on the power line, knowing the line's maximum-rated voltage level can set an upper limit of field strengths regardless of individual onsite measurements.
At EMF MEASUREMENT BASICS we introduce the topic and outline measurement procedures; that article includes links to detailed how-to procedures, worksheets, and related data.
At EMF MEASUREMENT STEP BY STEP we give detailed measurement suggestions.
If any of our articles leave you with questions, comments, criticism, just let me know and I'll do my best to research further as needed.
Questions & answers or comments about how to measure electromagnetic fields, EMF radiation at and around buildings
Ask a Question or Enter Search Terms in the InspectApedia search box just below.
Technical Reviewers & References
Related Topics, found near the top of this page suggest articles closely related to this one.