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
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 Collapse Dust Photos
EMF Measurement data collection worksheet: Here we show an example of an EMF survey worksheet that documents actual measurement locations and suggests standard locations to aid in developing repeatable and more credible EMF measurements. This series of EMF measurement articles 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. Author Daniel Friedman.
Just below we show an image of a sample worksheet with actual EMF field measurement data. Click the image to see the EMF worksheet in full size.
Also see Electric Power Lines, Electromagnetic Fields, Cancer Risk, & "Enviro-Scare" - The Normal Curve Cycle of Public Fear of Environmental Issues which discusses the impact of EMF and other environmental concerns on property values. And see EMF ELECTROMAGNETIC FIELDS & HUMAN EXPOSURE which discusses EMF exposure in the workplace. Also see EMF RF FIELD & FREQUENCY DEFINITIONS for a simple explanation of different types of radio frequency (RF) and electromagnetic frequency (EMF) types and where they are found.
The information provided here is for research and study purposes. The author makes no representation of unique expertise on this topic, other than having field experience in EMF measurement, having studied technical literature and having conversed with other experts and authors in the field for a number of years.
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.
Link to a Live Excel Spreadsheet for Use as an EMF Data Recording Worksheet
Our EXCEL Spreadsheet EMS_Survey_Sample1.xls provides an example of common locations and measurement points. This spread sheet includes computations necessary to produce mathematically valid measurement. Expand the hidden worksheet fields to see details of the EMF calculations.
Accuracy and Repeatability of EMF Measurements
NOTE: EMF Readings will virtually always vary widely on other dates depending on the load on the local power transmission line or other electrical field source loading, and will increase when the electrical supply system is more heavily loaded - eg. in summer when air conditioners are operating.
Therefore although it is essential to select standard measurement points at any EMF survey location so that one can attempt to make repeatable measurements, a thorough EMF site survey also will need to know the actual EMF source (power transmission line for example) load during the EMF measurement interval. If that data cannot be obtained, the EMF measurements are still useful but need to be interpreted based on time of year, probable transmission line loading, and other site variables.NOTE: The EMF measurement procedure that computes the root mean square data for three EMF measurements made at each EMF measurement location is ONLY needed if making EMF measurements using a position-sensitive instrument.
If your EMF measuring instrument does not show position sensitivity you can simply use its final reading for each sample point
Readers are urged to consult expert sources and to give any suggestions regarding these notes to the author.
Frequently Asked Questions (FAQs)
Use the search box below to ask a question or to search the InspectApedia.com website.
Ask a Question or Enter Search Terms in the InspectApedia search box just below.
Technical Reviewers & References
Use links just below or at the left of each page to navigate this document or to view other topics at this website. Green links show where you are in our document or website.