Frequency measurement with an avometer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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With sufficient accuracy for amateur purposes (approximately ± 10%), the frequency of electrical oscillations in the range of 50 Hz - 200 kHz can be measured using an RC chain and a conventional avometer. A series-connected capacitor and a variable resistor are connected to an alternating voltage source, the frequency of which is to be measured. Then measure the voltage drop across the resistor and capacitor separately.
By rotating the variable resistor slider, they ensure that the voltage drops across the resistor and capacitor become equal. After that, the resistance of the inserted part of the resistor is measured and the frequency f is calculated using the formula
f=1/(2pRC), Hz,
where R is the resistance of the input part of the variable resistor, Ohm; C - capacitance of the capacitor, f.
To improve the accuracy of measurements, capacitors with a permissible deviation from the rated capacity of no more than ± 5% should be used. When measuring high frequencies, it is desirable that the capacitor and resistor have as little self-inductance as possible. In addition, in this case, it is recommended to use a high-frequency AC voltmeter.
Author: V. Bukhevich; Publication: N. Bolshakov, rf.atnn.ru
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