The determination of the first cavity resonance frequency of a PCB board.
Standard EIA Decade Values Table.
Here are the E12-E196 table and the complete description EXCEL file.
Resistors, Capacitors and Inductances.
The determination of the FR-4 material Dielectric Constant Ԑr by a cavity resonance.
If you have an ability to measure a PCB's cavity resonance, you can, with great accuracy, determinate the real relative permittivity Ԑr of your board material. To do this, take a piece of your FR-4 (or other) and seal (solder) all four ends with copper.
Next, measure the cavity resonance first frequency (the lowest) and use this calculator to find the real Ԑr of your PCB material.
All documents on this website belongs to Alex Lapayev. Usage is free, repost and publication is allowed only by providing document sourse (e.g. taken from lapayev.com).