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Screened-Room Measurements on the NIST Spherical-Dipole Standard Radiator.

G Koepke1, J Randa1

  • 1National Institute of Standards and Technology, Boulder, CO 80303.

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|July 5, 2023
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Summary
This summary is machine-generated.

Radiated emissions measurements using the NIST spherical-dipole standard radiator showed significant variability across different screened rooms and test days. These findings highlight challenges in standardized radiated emissions testing.

Keywords:
MIL-STD-462radiated emissionsscreened roomspherical dipolestandard radiator

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Area of Science:

  • Electromagnetic compatibility (EMC) testing
  • Metrology and measurement science

Background:

  • Screened rooms are essential for controlling electromagnetic interference during testing.
  • Standardized radiated emissions measurements are critical for regulatory compliance and product development.

Purpose of the Study:

  • To evaluate the performance of the NIST spherical-dipole standard radiator in screened rooms.
  • To investigate the variability of radiated emissions measurements in different screened room environments.
  • To compare screened room results with measurements from other test facilities.

Main Methods:

  • Measurements of radiated emissions were conducted using the NIST spherical-dipole standard radiator.
  • Tests were performed in multiple screened rooms following MIL-STD-462 (1967) guidelines.
  • Comparative measurements were made using a transverse electromagnetic (TEM) cell, open-area test site (OATS), and anechoic chamber.
  • OATS tests were used to assess the temporal stability of the radiator and the effect of a ground plane.

Main Results:

  • Significant variations in measured field intensity were observed between different laboratories and even on different days within the same laboratory.
  • A systematic low-frequency difference was noted between screened room results and those from TEM cells, OATS, and anechoic chambers.
  • The standard radiator demonstrated temporal stability, and its ground plane loading effect was quantified.

Conclusions:

  • The study identified substantial variability in screened room radiated emissions measurements, indicating potential challenges for standardization.
  • Discrepancies between screened room results and other test environments necessitate further investigation for accurate EMC testing.
  • The NIST spherical-dipole standard radiator is a stable and useful tool for characterizing measurement environments.