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Application of series resonance is
Oscillators
Q meter
Induction Heating
Tuned Tank Circuit
Q meter
A Q meter utilizes the principle of series resonance to measure the Quality Factor (Q) of a coil. At resonance, the voltage magnification property of a series RLC circuit allows for the precise determination of the coil's inductive reactance relative to its resistance.
A Q meter utilizes the principle of series resonance to measure the Quality Factor (Q) of a coil. At resonance, the voltage magnification property of a series RLC circuit allows for the precise determination of the coil's inductive reactance relative to its resistance.
f0тАЛ=2╧АLCтАЛ1тАЛ тАФ Resonant frequency of the series circuit
Q=R1тАЛCLтАЛтАЛ тАФ Definition of Quality Factor at resonance
In a series RLC circuit, at the resonant frequency f0тАЛ=2╧АLCтАЛ1тАЛ, the inductive and capacitive reactances cancel out. The circuit impedance becomes purely resistive (Z=R), leading to a maximum current for a fixed applied voltage. The Q meter measures the voltage across the capacitor, which is Q times the input voltage, thereby providing a direct measurement of the quality factor.
Series resonance produces minimum impedance and maximum current.
The Q meter is specifically designed to measure the efficiency of components like inductors at high frequencies.
Voltage magnification is the core phenomenon exploited in Q meters.
Direct reading of Q factor
High sensitivity for radio frequency measurements
Limited frequency range
Requires high-precision variable capacitors
Measurement of coil resistance
Determination of self-capacitance of coils
Oscillators typically use parallel resonance (tank circuits) for frequency stability.
Induction heating primarily relies on high-frequency electromagnetic energy transfer, often using load-matching networks.
A Tuned Tank Circuit is generally parallel resonant, used for filtering or frequency selection.
B is correct тАФ The Q meter operates by measuring the voltage magnification across a capacitor in a series resonant RLC circuit.
Remember that 'Series Resonance' acts as a voltage magnifier, whereas 'Parallel Resonance' (Tank Circuit) acts as a current magnifier and impedance maximizer.