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a practical Q-meter circuit is shown in picture.The wide-range oscillator with a frequency range from 50 kHz to 50 MHz delivers current to a low-value shunt resistance R.The value of this shunt is very low, typically on the order of 0.02 ohms.It introduces almost no resistance into the oscillatory circuit and it therefore represents a voltage source of magnitude E with a very small (in most cases negligible) internal resistance.The voltage E across the shunt ; corresponding to E in picture , is measured with a thermocouple meter, marked “multiply Q by .”The voltage across the variable capacitor, corresponding to Ec in picture, is measured with and electronic voltmeter whose scale is calibrated directly in Q values.
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