An uncertainty model of a non-ideal open area test site for electromagnetic measurement
An open area test site (OATS) is a standard facility to perform electromagnetic compatibility (EMC) compliance testing of electrical and electronic products. An ideal OATS is a flat area, free of any obstructions and external signals. Precompliance testing in a non-ideal OATS is an economical way...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/193/1/24p%20IGNITIUS%20AGUNG%20WIBOWO.pdf http://eprints.uthm.edu.my/193/2/IGNATIUS%20AGUNG%20WIBOWO%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/193/3/IGNATIUS%20AGUNG%20WIBOWO%20WATERMARK.pdf |
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| Summary: | An open area test site (OATS) is a standard facility to perform electromagnetic
compatibility (EMC) compliance testing of electrical and electronic products. An
ideal OATS is a flat area, free of any obstructions and external signals. Precompliance
testing in a non-ideal OATS is an economical way to prepare a product
for compliance testing. However, measurements in the non-ideal OATS have higher
uncertainty. In addition, the existing model to analyse the measurement uncertainty is
not adequate. Therefore, this research proposes an uncertainty model of a non-ideal
OATS for electromagnetic measurement to analyse the measurement uncertainty
components in the non-ideal OATS. In this research a normalized site attenuation
(NSA) measurement uncertainty model was derived. A 3-m non-ideal OATS has
been designed and built. The suitability of the location to build the OATS has been
evaluated. To evaluate the measurement uncertainty in the site and the closeness of
the site NSA to the ideal NSA, a series of NSA measurements in the non-ideal OATS
were performed in the frequency range of 300 MHz to 1000 MHz. From the analysis,
the expanded uncertainties of the OATS with a coverage factor of 2 were in the range
of ±1.68 dB to ±1.98 dB. Besides, the OATS NSA values were inside ±4 dB margins
as specified in CISPR 16-1-4:2010 standard. Therefore, the non-ideal OATS is
eligible for pre-compliance testing. Based on many factors investigated in the
sensitivity analysis, it was found that the dominant factor that contributed to the
measurement uncertainty in the non-ideal OATS came from the antennas. In
summary, this research mainly contributes to the development and evaluation of a
low cost non-ideal OATS for pre-compliance testing. |
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