Q Meter Circuit Diagram

Circuit diagram of a q meter is shown is figure. The ratio of the inductive reactance to the effective resistance of the coil is called the quality factor or q factor of the coil. May be had by reference to the patent to h.

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The circuit diagram of the q meter is shown below.

Q meter circuit diagram. A wide range os cillator with frequency range from 50 khz to 50 mhz is used as a power supply to the cir cuit. It is designed with an oscillator that uses the frequency that ranges from 50 khz 50 mhz. A q meter measures the quality factor of a circuit q which expresses how much energy is dissipated per cycle in a non ideal reactive circuit. For a verbal description click here.

This expression applies to an rf and microwave filter bandpass lc filter or any resonator it also can be applied to an inductor or capacitor at a chosen frequency. So q x l r ωl r. The output of the oscillator is shorted by a low value resistance r sh usually of the or der of 0 02 ohm. If a fixed voltage is applied to the circuit a voltmeter across the capacitor can be calibrated to read.

The voltage drop across the coil or capacitor is q times the applied voltage where q is the ratio of reactance to resistance x l r. The q meter working principle is based on series resonance. R13 0 2 ω is five 1 ω composition resistors in parallel. And provides current to a shunt resistance rsh with 0 02 ohms value.

We know that every inductor coil has a certain amount of resistance and the coil should have lowest possible resistance. Figure 2 q meter circuit diagram. The q meter may be one of the simplest pieces of test equipment in existence. A more detailed explanation of q and of the basic q meter circuit.

To calibrate set sig gen level for half scale on m1. Q meter is also known as rlc meter. Figure 3 functional block diagram of the boonton q meter. Questions answers 3 1.

Q meter circuit and theory. It has 3 basic parts an oscillator a calibrated variable capacitor and an rf voltmeter. 2 137 787 november 22 1938 and basic electrical measurements by m. Q meter is an instrument designed for measuring quality factor q of a coil as well as for the measurement of inductance capacitance and resistance of an electric circuit at radio frequency.

Test terminals 1 4 are to connect lx and cx. Applications of q meter 3. Circuit diagram of q meter 2. The boonton q meter.

The instrument which measures the storage factor or quality factor of the electrical circuit at radio frequencies such type of device is known as the q meter the quality factor is one of the parameters of the oscillatory system which shows the relation between the storage and dissipated energy. For inductors where is the reactance of the inductor is the.