The Resonance Bridge is used to inductance measurements and needs a signal source with frequency determined by the magnitude of the measured quantities. The circuit is shown in figure bellow and there two elements to be adjusted for balance: C and R3. C4 and R4 are the capacitance and resisitance associated to the inductance to be measured.
Formula:
Condiction to balance:
Where:
ω is 2 x π x f (f is the frequency in hertz - Hz)
R1, R2, R3 and R4 are the resistances in ohm (ohms)
C is the capacitance in farads (F)
L is the inductance in henry (H)
