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measuring of an inductivity by means of a measuring instrument of immittance Е7-20 and phase-sensitive measuring instrument Вектор-175

The dielectric properties were explored by means of a measuring instrument of immittance Е7-20 (THOUGHT) also a phase-sensitive measuring instrument the VECTOR - 175.

In a bottom of operation of device E7-20 the method of the voltmeter - of the ampermeter is figured.

The voltage of working frequency from the generator moves on measured object. The transformer shapes two voltages, one of which (Ut) another is proportional to a current proceeding through measured object, (Uh) - to a voltage on it. The relation of these voltages of equally complex admittance (Y) or to complex resistance (Z) object.

At measuring of high-resistance objects (limits of measurings ∣Z ∣ from 1 clod to 10 MOm) when the signal generator is a voltage radiant, it is more preferable to carry out measurings in the form of conductivity components (Ux-Ur. Uo-Ut).

In case of measuring nizkoomnyh volume objects, the signal works as the current generator (limits of measurings ∣Z ∣ from 1 Ohm to 100 Ohm) and more convenient is measuring in the form of components of the full resistance (Ux-U τ. Uo-Ut).trebuemaja the immittance shape is reached by recalculation from the primary shape and carried out by the controller. Expansion of limits of measuring is reached at the expense of change of a transfer ratio of an intensifying path of a logometer at measuring of components of numerator Ux in 10, 100 and 1000 times.

The jet component of complex resistance was measured in the given operation. Also it was calculated imaginary and the real an inductivity builder.

Quantity of the real builders ε ' paid off under the formula:

For calculation imaginary inductivity builders the formula was used:

ВЕКТОР-175 - The independent measuring device with one day off and two input channels which gang of functions is intended for carrying out of trials of electronic devices.

The exit of the built in broadband generator is used as the generator of exploring signals of the sinusoidal and rectangular shape. To an exploring signal it is possible to add a constant component.

Two inlets ВЕКТОР-175 differential, broadband. Signals of a voltage submitted on inlets are handled by a method of direct numeral transformation on low frequencies, for accuracy pinch on high frequencies the heterodyne method is used.

In device VEKTOR-175 two processors are erected:

TSSP (the numeral alarm processor), carrying out data processing;

The CENTRAL PROCESSING UNIT (the central processor), used for guidance and information mapping.

The measuring system bottom is made BY COTTON VELVET-MATRIX (the programmed logic integrated plan) to which various functional devices of the plan are connected.

Such universal block diagramme provides the functional flexibility allowing, not mentioning the hardware, programmno to realise in the device following functions:

• the Generator of exploring signals.

• the Two-channel voltmeter of true srednekvadraticheskih (true rms) values.

• the Phase-sensitive voltmeter (the vector voltmeter).

• the Analyzer of frequency characteristics (the analyzer it is peak - the frequency and fazo-frequency performance).

• the Fourier analysis.

At use of additional accessories, for example, current shunts, in the device following functions are realised:

• Measuring of true srednekvadraticheskih (true rms) values of a current.

• Measuring of parametres LCR.

• power Measuring.

The target sinusoidal signal is shaped by a method of direct numeral synthesis (DDS). The amplitude is erected in 2 stages - by means of exact and a coarse adjustment that allows to achieve the optimum resolution within all gamut. The signal of the rectangular shape is gained by transformation of a sinusoidal signal by means of the high-speed comparator. The target signal can be added by a constant component then he is filtrated and moves on the high-speed buffer amplifier with high loading ability.

Also it is possible to use inlets as one differential inlet on which the auxiliary is subtracted from the basic signal.

The signal after blocks geterodinirovanija and filtrations arrives on intensifying stages, and then in block ATSP. The select of a transfer ratio of an inlet, geterodinirovanija and frequencies of digitization ATSP is carried out by means of commands from TSSP.

In the given operation of measuring were carried out in a mode of measuring of an impedance (LCR).

2.1.2.

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A source: Gavaljan Mamikon JUrevich. Influence of crystallographic orientation and the impurity composition on optical, the dielectric and teplofizicheskie performances of crystals of germanium and paratellurita. The dissertation on competition of a scientific degree of the candidate of physical and mathematical sciences. Tver - 2016. 2016

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