Inexpensive Microwave Survey Instruments: An Evaluation
William A. Herman, Donald M. Witters, Jr. · 1979
Reliable EMF measurement requires quality instruments - cheap meters may provide false reassurance about microwave exposure levels.
Plain English Summary
This 1979 government report evaluated the accuracy and reliability of inexpensive microwave detection instruments available to researchers and safety professionals. The study examined how well these budget survey meters could measure microwave radiation levels compared to more expensive laboratory-grade equipment.
Why This Matters
This government evaluation came at a crucial time when microwave technology was rapidly expanding beyond military and industrial uses into consumer applications like microwave ovens. The reality is that accurate measurement tools are fundamental to understanding EMF exposure risks, yet many researchers and safety inspectors were forced to rely on cheaper instruments that might not provide reliable readings. What this means for you is that much of the early microwave exposure data from this era may have been collected with instruments of questionable accuracy. The science demonstrates that without proper measurement tools, we cannot adequately assess the true extent of public exposure to microwave radiation or validate safety claims made by manufacturers.
Finding
Based on the findings presented above, it seems clear that there are serious questions about the ability of each of these instruments to distinguish oven leakage levels which exceed the requirements of the Federal Performance Standard for Microwave Ovens (CFR 1030.10) from lower levels which do not.
In their words
“Based on the findings presented above, it seems clear that there are serious questions about the ability of each of these instruments to distinguish oven leakage levels which exceed the requirements of the Federal Performance Standard for Microwave Ovens (CFR 1030.10) from lower levels which do not.”
Figures from the Original Paper
Diagram extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study.
Study Details
To evaluate the usefulness and reliability of inexpensive microwave survey instruments for measuring microwave oven emissions, specifically focusing on accuracy, calibration, polarization sensitivity, AM response, and overload sensitivity.
Laboratory evaluations of three inexpensive microwave survey instruments (Micromate, Guard-Rod, Inte...
Micromate calibrated at 1.9 mW/cm2 with 3.4 dB AM sensitivity increase and 5 dB polarization increas...
The inexpensive instruments tested cannot reliably distinguish between hazardous oven leakage levels and acceptable levels. The Micromate may give false warnings at low levels and could be damaged without user awareness. The Guard-Rod may give false warnings or miss warnings for high-level leaks. The Interceptor/Microscan units may light up at very low levels but fail to light at high levels, making them potentially dangerous to users.
Show BibTeX
@article{inexpensive_microwave_survey_instruments_an_evaluation_g3912,
author = {William A. Herman and Donald M. Witters and Jr.},
title = {Inexpensive Microwave Survey Instruments: An Evaluation},
year = {1979},
}