Patent ID: 6600380
Filing Date: 2003-07-29
Classification: G01R,H03K

Abstract:
A method for the measurement of the damping of an LC-resonant circuit, comprising the steps of:generating a reference current (IREF) by applying a reference voltage (UREF) across a shunting resistor (Rp*), connecting the LC resonant circuit with an exciting circuit to form an electronic oscillating circuit, the exciting circuit (3) being supplied with a DC control current, which is proportional to said reference current, thereby generating an oscillation voltage (us) across the LC-resonant circuit, the oscillation voltage being proportional to said control current and an equivalent damping resistance (Rp) of the LC-resonant circuit, and altering the reference current (IREF) by variation of the shunting resistance (Rp*) in such a manner, that the amplitude of said oscillation voltage (us) is equal to the reference voltage (UREF), said shunting resistor (Rp*) then being a measure for the equivalent damping resistance (Rp).