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.
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