abstract:A Q meter is a piece of equipment used in the testing of radio frequency circuits. It has been largely replaced in professional laboratories by other types of impedance measuring device, though it is still in use among radio amateurs.
The mainfeaturesof the meterareas follows: The cylinder TE011 cavitywith high Q is used as the sensor of the thickness. Ittransforms the thicknessintoresonantfrequencyshift.