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A Significance Test for Reverberation-Chamber Measurement Uncertainty in Total Radiated Power of Wireless Devices
Kate A Remley1, Chih-Ming Wang1, Dylan F Williams1
1National Institute of Standards and Technology, Boulder, CO 80305 USA.
IEEE Transactions on Electromagnetic Compatibility
|June 17, 2021
Summary
A new significance test helps determine the dominant source of measurement uncertainty in mode-stirring chambers. This allows for optimized sampling strategies and simplified uncertainty calculations in electromagnetic compatibility testing.
Area of Science:
- Electromagnetic compatibility (EMC) testing
- Measurement uncertainty analysis
- Electromagnetic field theory
Background:
- Mode-stirring chambers are crucial for EMC testing, but their uncertainty components require careful evaluation.
- Uncertainty arises from finite sampling and spatial non-uniformity, impacting measurement accuracy.
- Accurate uncertainty assessment is vital for reliable EMC compliance.
Purpose of the Study:
- To develop a significance test for comparing uncertainty components in mode-stirring chambers.
- To provide expressions for uncertainty calculations in different scenarios.
- To guide users in optimizing sampling for accurate measurements.
Main Methods:
- Development of a statistical significance test to compare uncertainty sources.
- Derivation of analytical expressions for uncertainty components.
- Application of the test and methods to a practical measurement example.
Main Results:
- The significance test effectively identifies the dominant uncertainty component (sampling vs. uniformity).
- Expressions for uncertainty were derived for both finite sampling and spatial non-uniformity.
- A method was demonstrated to estimate the minimum required samples for dominant spatial uniformity uncertainty.
Conclusions:
- The developed significance test provides a robust tool for understanding measurement uncertainty in mode-stirring chambers.
- Optimized sampling strategies can be implemented based on the test results, simplifying uncertainty calculations.
- This work enhances the reliability and efficiency of EMC testing procedures.
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