Vaclav Ruzek

Influence of the probe position to disturbance measurement in the Workbench Faraday Cage

The Workbench Faraday Cage measurement method is a well known way, how to measure disturbance caused by integrated circuits mounted on PCB. This paper deals with simulation of this method provided by FORTRAN FDTD code. This work explores the influence of harmfull signals to measurement probe position and proposes a main theses, how to connect measure probes properly. Effect of opened Faraday Cage is also simulated.

Feature Selective Validation of Automotive EMC Pre-compliance Tests

The pre-compliance tests of electromagnetic immunity are at present a crucial issue for all major automotive manufacturers. In current practice, there are two basic ways to implement these tests. The first one is based on significant simplification of measurement methods and the subsequent transformation of results for relevant estimation of certification measurement results. The second is based on the application of numerical methods and the calculation of the electric field intensity distribution in the car body. The question, however, remains the degree of correlation between these methods, especially when confronting the results of certification measurement. This article provides an overview of the results obtained using both methods and offers an innovative view of the method of comparison using the FSV.

Modification of approximate worst-case measurement system for EMI filters

This paper deals with the approximate worst-case test method for testing the insertion loss of the EMI filters. The systems with 0.1 Ω and 100 Ω impedances are usually used for this testing. These measuring systems are required by the international CISPR 17 standard. The main disadvantage of this system is the 0.1 Ω impedance transformer. The dynamic range for the transformation from the 50 Ω, which is most common matched impedance for the measurement setups, to 0.1 Ω is very large. It is no easy to produce such transformers with this high impedance transformation ratio. These transformers have usually very narrow bandwidth. This paper discusses the alternative system with 1 Ω and 100 Ω impedances. The performance of these systems was tested on several filters and the obtained data are depicted, too. The performance comparison of several filters in several systems is also included. The performance of alternate worst-case system is discussed in the conclusion.