THE EFFECT OF INSTRUMENT AVERAGING TIME ON MICROWAVE POWER DENSITY MEASUREMENTS
Authors not listed · 1970
Proper instrument averaging time is essential for accurate microwave power density measurements and reliable EMF health research.
Plain English Summary
This 1970 technical report examined how the averaging time settings on microwave measurement instruments affect the accuracy of power density readings. The research focused on understanding measurement variability when assessing microwave radiation levels. This work was foundational for establishing proper protocols for measuring microwave exposures.
Why This Matters
This technical research from 1970 addresses a critical but often overlooked aspect of EMF science: measurement accuracy. The reality is that how we measure microwave radiation directly impacts what we think we know about exposure levels. When instruments average readings over different time periods, they can produce vastly different results for the same actual exposure. This matters enormously for EMF health research because inaccurate measurements lead to flawed conclusions about safety.
What this means for you is that many early studies on microwave exposure may have significant measurement errors built into their findings. The microwave ovens, radar systems, and early wireless communications of that era were being assessed with instruments that may not have been properly calibrated for averaging time. This foundational measurement work helps explain why some historical EMF research produced inconsistent results.
Finding
The Narda 8100, when used in the fast response setting, gives an accurate representation of power density variations from ovens using slow stirrer speeds. As the mode stirring frequency is increased so that fluctuations in the radiated field occur in less than one second, the Narda 8100 will no longer indicate maximum values but will begin to show reduced variations about the average.
In their words
“The Narda 8100, when used in the fast response setting, gives an accurate representation of power density variations from ovens using slow stirrer speeds. As the mode stirring frequency is increased so that fluctuations in the radiated field occur in less than one second, the Narda 8100 will no longer indicate maximum values but will begin to show reduced variations about the average.”
Source
(1970) (1970)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 study the effect of instrument averaging time on recorded values of leakage from microwave ovens and the effect of instrument averaging time on measurement techniques
The microwave source used for response measurements was a Polarad generator set: to a frequency of 2...
The results are presented in figures 2 and 3 for Narda 8100 system using a model 8122 (0-20-200 mW/c...
Any averaging time other than an internal instrument averaging time creates difficulty with survey procedures and does not necessarily relate to physically meaningful measurements, The response of an instrument system determines whether or not the reading is a maximum or average value, The Narda 8100, when used in the fast response setting, gives an accurate representation of power density variations from ovens using slow stirrer speeds. As the mode stirring frequency is increased so that fluctuations in the radiated field occur in less than one second, the Narda 8100 will no longer indicate maximum values but will begin to show reduced variations about the average. Procedures should be established as guides to the surveyor so that a proper amount of data will be taken to determine compliance. These procedures should only be guides and not limitations on the methods and amount of data taken by the operator or surveyor.
Show BibTeX
@article{the_effect_of_instrument_averaging_time_on_microwave_power_density_measurements_g4264,
author = {Unknown},
title = {THE EFFECT OF INSTRUMENT AVERAGING TIME ON MICROWAVE POWER DENSITY MEASUREMENTS},
year = {1970},
}