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Characterization of the measurement uncertainty for the electromagnetic conducted and radiated emission test

Ayob, Mohd Erdi (2017) Characterization of the measurement uncertainty for the electromagnetic conducted and radiated emission test. Masters thesis, Universiti Tun Hussein Onn Malaysia.


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Electromagnetic Compatibility or EMC is the ability for the product or equipment under test (EUT) able to operate in its intended environment with causing undue interference or being unduly affected by it. The requirement for non-interference has been known for many years but it is only now with the introduction of legislation that we are seeing a major growth in demand for testing. The USA with its FCC regulations has for some time tried to control emissions from certain types of equipment. Japan has also had a voluntary code (VCCI) and Europe, after some delay, fully introduced mandatory regulations at the end of 1996. The ultimate importance of an EMC testing is to ensure the EUT is not affected by the other operating EUT and vice versa. These conditions apply for both conducted (CE) and radiated emission (RE). Other areas are now introducing regulations and it seems likely that the system will spread to encompass the whole world in the future. Currently, measurement of an equipment under test (EUT) shall cast a doubt when the result is close to the specification limits. In the common practice, the MU is taken as an informational purpose only in the report and not for the EUT status. The implementation of the measurement uncertainty for the reporting is crucial since the EUT might fail the EMC test if the passing margin is below the International Special Committee on Radio Interference (CISPR) standards. In acquiring the MU for the judgement criteria, comparison with the standards and inter-laboratory comparison shall take place. These include the standard classification for the EUT type, expanded uncertainty estimation to the CISPR standard (UCISPR), EMC equipment factor estimation and proficiency test with the other accredited EMC laboratory using the Z-Score method. The inter-laboratory comparison used the same calibrated signal source which emits the stable broadband emission. Finally, the cumulative results are to be taken as a laboratory expanded uncertainty ULAB= 2uc(y). The thesis focused the application of the expanded uncertainty deployment for the judgement criteria for the finalize EUT status.

Item Type: Thesis (Masters)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK6540-6571 Radio
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 27 Mar 2018 04:31
Last Modified: 27 Mar 2018 04:31
URI: http://eprints.uthm.edu.my/id/eprint/9863
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