Analysis and evaluation of uncertainty for conducted and radiated emissions tests
Whenever an EMC measurement is made, there are numerous uncertainties in different parts of the measurement system and even in the EMC performance of the equipment under test (EUT) which is being measured. It is important to be able to estimate the overall uncertainty, in particular, the test set...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1963/1/24p%20MOHAMED%20EMHEMED%20ABDURRAHIM.pdf http://eprints.uthm.edu.my/1963/2/MOHAMED%20EMHEMED%20ABDURRAHIM%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1963/3/MOHAMED%20EMHEMED%20ABDURRAHIM%20WATERMARK.pdf |
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| Summary: | Whenever an EMC measurement is made, there are numerous uncertainties in different
parts of the measurement system and even in the EMC performance of the equipment
under test (EUT) which is being measured. It is important to be able to estimate the
overall uncertainty, in particular, the test setup and measurement equipment uncertainty.
However, making repetitive measurements can reduce the measurement uncertainty, but
often economics of time do not permit that. Therefore, a practical process, which is used
to evaluate uncertainty in EMC measurement a, according to the principle of uncertainty
and conditions in EMC measurement is presented. In this study, an efficient analysis of
uncertainty for both radiated and conducted emissions tests is performed. The
uncertainty of each contributor had been calculated and evaluating the reported
expanded uncertainty of measurement is stated as the standard uncertainty of
measurement. This standard uncertainty is multiplied by the coverage factor k=2, which
for a normal distribution corresponds to a coverage probability of approximately 95%.
The result of calculating the uncertainty for both conducted and radiated emission tests
showed that the overall uncertainty of the system is high and it must be lowered by
reducing the expanded uncertainty for the dominant contributors for both tests. In
addition, the result of applying the concept of CISPR uncertainty for both conducted and
radiated emission tests showed that non-compliance is deemed to occur for both EUT of
both tests. This is due to the result that the measured disturbances increased by
(
), above the disturbance limit. |
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