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Worksheet for Electromagnetic Field Surveys - Example EMF Measurement Procedure
- POST a QUESTION or COMMENT about how to record & organize EMF exposure measurement data for later analysis
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.
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Example Worksheets for Electromagnetic Field Measurements
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]
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.
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Reader Comments, Questions & Answers About The Article Above
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(Dec 5, 2011) Anonymous said:
I was happy to find this ! Great information.
(Feb 29, 2012) William said:
Thanks for the info. A service indeed to the wider community.
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Continue reading at EMF WORKSHEET Example or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.
Or see these
Articles About Electromagnetic Fields, Hazards, Measurements
- CELL PHONE RADIATION
- DEFINITIONS of EMF RF FIELD & FREQUENCY
- DEFINITIONS of HERTZ, KHz MHz GHz THz
- ELECTROMAGNETIC FIELD EMF ELF & RF DETECTION
- EMF ELECTROMAGNETIC FIELDS & HUMAN EXPOSURE
- EMF CANCER SCARE
- EMF CANCER RISK
- EMF/EMR MEASUREMENT OVERVIEW
- EMF LOCAL SOURCES MAY EXCEED POWER LINE STRENGTH
- EMF MEASUREMENT DISTANCE AFFECTS STRENGTH
- EMF MEASUREMENT INSTRUMENTS
- EMF MEASUREMENT INSTRUMENT ACCURACY
- EMF MEASUREMENT INSTRUMENT USE TIPS
- EMF MEASUREMENT PROCEDURES
- EMF MEASUREMENT STEP BY STEP
- EMF REFERENCES
- EMF SURVEY PROCEDURE
- EMF SURVEY REPORT INTERPRETATION
- EMF WORKSHEET for EMF MEASUREMENTS
- EMF WORKSHEET Example
- EMF WORKPLACE EXPOSURE
- ENVIRONMENTAL HAZARDS at BUILDINGS - home
- ENVIRO-SCARE - PUBLIC FEAR CYCLES
- HAZARD vs RISK
- RF RADIO FREQUENCY DETECTION METERS
Suggested citation for this web page
EMF WORKSHEET for EMF MEASUREMENTS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.
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INDEX to RELATED ARTICLES: ARTICLE INDEX to BUILDING ENVIRONMENT
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Citations & References
In addition to any citations in the article above, a full list is available on request.
- Electric Power Lines, Electromagnetic Fields, Cancer Risk, & "Enviro-Scare" - The Normal Curve Cycle of Public Fear About Environmental Issues - online document by DF
- A Procedure for Measuring EMF electromagnetic fields online document by DF
- "Questions and Answers about Biological Effects and Potential Hazards of Radiofrequency Electromagnetic Fields", Federal Communications Commission, Office of Engineering and Technology, US FCC, OET Bulleting 56, 4th Edition, August 1999
" Many consumer and industrial products and applications make use of some form of electromagnetic energy. One type of electromagnetic energy that is of increasing importance worldwide is radiofrequency (or "RF") energy, including radio waves and microwaves, which is used for providing telecommunications, broadcast and other services. In the United States the Federal Communications Commission (FCC) authorizes or licenses most RF telecommunications services, facilities, and devices used by the public, industry and state and local governmental organizations. Because of its regulatory responsibilities in this area the FCC often receives inquiries concerning whether there are potential safety hazards due to human exposure to RF energy emitted by FCC-regulated transmitters. Heightened awareness of the expanding use of RF technology has led some people to speculate that "electromagnetic pollution" is causing significant risks to human health from environmental RF electromagnetic fields. This document is designed to provide factual information and to answer some of the most commonly asked questions related to this topic." - original source: U.S. Federal Communications Commission Office of Engineering and Technology, http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet56/oet56e4.pdf - "Magnetic Field Exposure and Cancer: Questions and Answers [ copy on file as /emf/EMF_Fact_Sheet_NCI_NIH.pdf ] - ," National Cancer Institute, U.S. National Institutes of Health, web search September 2010, original source: http://www.cancer.gov/cancertopics/factsheet/Risk/magnetic-fields
makes these five key points about EMF- Electric and magnetic fields (EMF) are areas of energy that surround any electrical device. EMFs are produced by power lines, electrical wiring, and appliances (see Question 1).
- Electric fields are easily shielded or weakened by walls and other objects, whereas magnetic fields are not. Since magnetic fields are more likely to penetrate the body, they are the component of EMFs that are usually studied in relation to cancer (see Question 1).
- Overall, there is limited evidence that magnetic fields cause childhood leukemia, and there is inadequate evidence that these magnetic fields cause other cancers in children (see Question 2).
- Studies of magnetic field exposure from power lines and electric blankets in adults show little evidence of an association with leukemia, brain tumors, or breast cancer (see Question 3).
- Past studies of occupational magnetic field exposure in adults showed very small increases in leukemia and brain tumors. However, more recent, well-conducted studies have shown inconsistent associations with leukemia, brain tumors, and breast cancer (see Question 4).
- EMF RF FIELD & FREQUENCY DEFINITIONS RF and EMF measurement tools need to be properly chosen to measure the particular type and frequency of RF or EMF signal that is of interest. 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.
- "Evaluation of Potential Carcinogenicity of Electromagnetic Fields," EPA Report #EPA/600/6-90/005B October 1990. EPA: 513/569-7562.
- "Biological Effects of Power Frequency Electric and Magnetic Fields" background paper, prepared as part of OTA's assessment of "Electric Power Wheeling and Dealing: Technological Considerations for Increasing Competition," prepared for OTA by Indira Nair, M. Granger Morgan, H. Keith Florig, Department of Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, PA 15213
- "Biological Effects of Power Line Fields," New York State Powerline Project. Scientific Advisory Board Final Report, July 1, 1987.
- "Extremely Low Frequency (ELF) Fields," Environmental Health Criteria 35. World Health Organization, Geneva, 1984.
- "Electric and Magnetic Fields at Extremely Low Frequencies: Interactions with Biological Systems. In: Non ionizing Radiation Protection, World Health Organization, Regional Office for Europe, Copenhagen, 1987.
- "Electric and Magnetic Fields from 60 Hertz Electric Power: What do we know about possible health risks?," Department of Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, PA 15213 1989.
- "Electromagnetic Fields Are Being Scrutinized for Linkage to Cancer," Sandra Blakeslee, New York Times, Medical Science section, April 2, 1991
- Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Also see our Book Reviews - InspectAPedia.
- In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested
CONTINUE READING or RECOMMENDED ARTICLES.
- Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: info@carsondunlop.com. Alan Carson is a past president of ASHI, the American Society of Home Inspectors.
Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The HOME REFERENCE BOOK - the Encyclopedia of Homes and to use illustrations from The ILLUSTRATED HOME .
Carson Dunlop Associates provides extensive home inspection education and report writing material. In gratitude we provide links to tsome Carson Dunlop Associates products and services.
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