Select a short piece of semi rigid (5 cm is adequate) with a suitable connector at one end. The size of the sample can be selected by using the PCB Sample Size Calculator for relative dielectric constant measurements. The sample shall have one fine hole at the centre, just large enough to insert the centre conductor of a piece of semi rigid coax. It may assist to put small circles at the corners of the PCB in order to define the boundaries. The sample shall be surrounded by at least 1 cm of bare dielectric. Prepare a sample PCB which shall have a circular sample on the top and a concentric mirrored ground on the bottom. By using the method shown here, these errors will be removed and a more accurate result obtained. Relative dielectric constant is traditionally measured at 1 MHz on a sheet of PCB material and this produces erroneous results because skin effect and fringing are not taken into account. Chemandy Electronics Logo Chemandy Electronics Logo CHEMANDY ELECTRONICS Suppliers of the Unusual Show navigation Hide navigationĪccurate Method for Measuring Relative Dielectric Constant of a PCB Using a Vector Network Analyser and parallel plates. Accurate Method for Measuring Relative Dielectric Constant of a PCB Using a Vector Network Analyser analyzer and parallel plates.
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