Working Principle of Q Meter
The basic working principle of Q meter is the series resonant that means the condition which exists in the circuit – the inductance and the capacitance reactance are equal in magnitude and induces the energy between their electric and magnetic field respectively. Mainly it depends on the features of some components: capacitance, inductance , resistance in the series circuit.
Let’s consider these components in resonance in the series circuit:
At resonant frequency:
capacitance = inductance
XC = XL
The value of XC and XL = 1/2πƒ0
Now the value of current at resonant frequency
I0 = E/R = V/R
where:
V or E = Incoming Voltage
R = Reactance
The voltage E across the capacitor is given as:
EC = I0 X0 = I0 X0 = I0 ωo L
Input Voltage EC = I0 R
EC/E = I0 ω0 L/I0 R
EC/E = ω0 L/R
EC/E = Q
At resonant frequency, the incoming voltage E or V is Q times the voltage passes across the capacitor.
E = E0Q
Now, we calculate the value of quality factor by attaching voltmeter across capacitor.
Q Meter
It is an electronic device used in communication like telecommunication in hardware and electronics to determine or calculate the value of the quality factor of the electrical system. It is also used in electric capacitors to measure the value of capacitance and in inductors to calculate the value of inductance. It works and runs on the principle of resonance. When the circuit is in the condition of resonance, the circuit’s impedance becomes resistive. It also measures or calculates the reactance of many unknown circuits by using the known reactance. It is also known as the Quality Factor Meter.
Table of Content
- What is Q Meter?
- Formula for Q Meter
- Components
- Q Meter Circuit
- Working Principle
- Applications of Q Meter
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