A helpful article from In-Compliance magazine describing the practical implications of skin effect on product design, particularly sheilding.
Understanding skin effect and surface currents saves us a lot of time and cost in the design of our product’s shielding and filtering, especially for tough EMC standards such as automotive, military or aerospace. It also helps us to more quickly achieve many other issues in cost-effective EMC design.
This extensive tutorial provides a thorough foundation for the understanding of piezoelectric/crystal resonators properties and behaviors. The table of contents provides insight into just how comprehensive this tutorial is:
1. Applications and Requirements
2. Quartz Crystal Oscillators
3. Quartz Crystal Resonators
4. Oscillator Stability
5. Quartz Material Properties
6. Atomic Frequency Standards
7. Oscillator Comparison and Specification
8. Time and Timekeeping
9. Related Devices and Applications
In this practical tip from InCompliance magazine, instructor Arturo Mediano discusses the importance of using the actual load of your device rather than substituting and equivalent resistor when testing for EMI.
Successfully troubleshooting EMI/EMC problems isn't easy. You need time, you need a strategy, and you need to remain calm. Sometimes, you need a special "sixth sense" that only comes from experience because in some cases, your problems aren't even related with the EUT (equipment under test).
Article by instructor Arturo Mediano about near-field scanners.
I love near field probes because they let me "see" magnetic and electric fields with an oscilloscope or with a spectrum analyzer. They let locate sources of emissions in board, cables, and systems. Near-field scanners also let you see emissions, particularly all over a board. That's hard to do with a single probe.
Arturo Mediano teaches courses on EMC/EMI and Signal Integrity for Besser Associates. He is a frequent contributor to industry magazines and journals on these topics. This article appears in the "Practical Tips" section of InCompliance magazine.
Ferrites for EMI suppression are usually chosen looking for high (resistive) impedance at the frequency of interest; but, sometimes, that ferrite is not working as expected. Perhaps you have saturation effects?