SU569968A1 - Impedance gauge - Google Patents

Description

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The invention relates to a measuring equipment and is intended for the purpose of imperial & nB ON mainly at high frequencies.

A meter is known; a resonant-type impedance, consisting of a generator-high frequency voltage, a resonant measuring circuit, shunted by an exemplary active conductivity variable, and an indicator, based on the method of replacing the total measured wiring DI1; hold i. Its disadvantage is low measurement accuracy, especially for high conductivities.

The purpose of the invention is to increase: productivity and accuracy of measurements.

This is achieved by the fact that an impedance meter, containing an alternating voltage generator, connected through a first detector and an exemplary potentiometer to the 20th first harmonic indicator, and a bridge formed by the indicated exemplary pattern. meter and divider 5I containing series-connected exemplary resistor and oscillating circuit with parallel iod- and

The measured impedance to it is equipped with a second detector, a varicap and a second harmonic voltage indicator, the latter of which is connected to the first harmonic voltage indicator and, through the second detector, simultaneously with the reference resistor, the oscillating circuit and the varicap, the latter being connected to the model potentiometer and the first detector

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The drawing shows a schematic diagram of the proposed device.

The impedance meter consists of an alternating voltage generator 1, a measurement of a potential impedance 2, an exemplary resistor 3 of an oscillatory circuit 4, consisting of inductance 5 and an exemplary capacitor 6, first harmonic detector 7, varicap 8, second harmonic detector 9, standard potentiometer 10, indicator 11 of the first harmonic and indicator 12 of the second harmonic ,.

The work of such a meter is as follows.

Initially, the measurement impedance is 2 off. The signal from the generator I is fed through the sample resistor 3 to the circuit 4, which is simultaneously highlighted by the amplitude modulation voltage through the detector 7 through the potentiometer 10 to the first harmonic controller 11. The same voltage through the varicap 8 is applied to the tunable circuit 4 Changing the capacitance of the varicap 8 causes the deviation of the resonant frequency of the tunable circuit 4. By adjusting it to resonance, the capacitor 6 achieves the maximum amplitude modulation voltage at the output of the detector 9 according to the indicator 12 , and using a potentiometer 10, the indicator 11 is rolled to zero. Then, the measured impedance 2 is connected to the oscillating circuit 4, which leads to a circuit 4. By changing the value of the condensation The torus 6 again adjusts the circuit 4 to the resonance according to the indicator 12. The magnitude and the sign of the change in the capacitance of the capacitor 6 correspond to the reactive component of the measured impedance, and the change in the magnitude of the potentiometer 10 necessary to reduce to zero, the indicator 11, proportional to the value of the active component measured impedance.

Since the 1O potentiometer operates at a low frequency, M05KHo j ony43iTb BbicoK: yra. Accuracy measurement of the active component of impedance 2. Adjusting the second harmonic of the modulation frequency to the maximum ensures high sensitivity and, therefore, tuning accuracy for resonance (thereby measuring the reactive component) even at relatively small values of the active component of the measured impedance. Indication and adjustment of the reactive component by the second harmonic measurer, and the active component — by the first harmonic measurer, increase the measurement performance, since there is no need for multiple adjustments.

Claims (1)

1. Chebatarev, B.F. Resonant Measuring Components of Total Conductivity. Exchange of experience in the electronic field, № 9, 1963 ,: p. 32-33,