The number of stirrer positions vs power
Testing time is valuable, so this post provides tips on optimising the number of stirrer positions in your reverberation chamber to fit your budget and test requirements. “There is a delicate balance between the number of stirrer positions and the amplifier power for a given reverberation chamber,” explains our R&D Consultant, Dimitrios Barakos. By collaborating with EMC test solution provider Rohde & Schwarz, we aim to find the most efficient solution for our clients. “
13/11/2024
Can you upgrade an EMC chamber and keep the old, glued ferrite tiles? “It’s possible”, says Uliana Trucchi, one of our technical consultants. “Say you want to replace your old absorbers because you need to meet performances over 1GHz, and you wish to keep the ferrite tiles because they are glued to the chamber’s walls and ceiling. That is exactly what the people from Nemko in Germany asked us for the chamber upgrade in the photo.”
Uliana was in charge of upgrading this room, which is ready to go into operation as we speak. Uliana: “Ferrite tiles are made from ceramic materials used since the late 60s to absorb magnetic waves. They come in different thicknesses from different suppliers, which makes it difficult for us to work with because the impedance between the ferrite tiles and the absorbers we use for EMC chambers must match when working between 80-240 MHz. Our R&D specialists, Dimitrios Barakos and Dmitriy Penkin, made the necessary calculations for this project to see if we could match our new absorbers with the existing tiles, and they came up with a solution.”
Nicola Baus, responsible for marketing at Nemko, recalls a challenging process. Nicola: “Keeping the existing tiles was a huge relief for us. It saves costs and extra downtime for the chamber, which is just as valuable. The working conditions were not ideal for the Comtest installation team due to the lack of storage space, but we finally solved this by working with containers outside our building. Despite these challenges, they delivered the upgraded chamber in time for us to resume testing.”
We advise companies that rent their buildings to use dismountable tiles instead of glued, non-removable tiles. Contact Uliana Trucchi for more information on both options.