SU761914A1 - Measuring circuit - Google Patents

Description

The invention relates. to electrical measuring equipment, intended for the simultaneous conversion of the measured components (complex resistance into active value.

A measuring circuit is known, (containing a branch composed of subsequently connected measured impedance and a sample element, homogeneous to one of the components of the measured impedance, free, the terminals of which are connected to a harmonic source [G].

The disadvantage of this measuring chain is that the accuracy of converting the absolute value, absolute change and relative change to the active value of the measured component of the impedance, which is not homogeneous to the model Element, depends on the frequency deviation of the power supply of the measuring circuit, which places high demands on the frequency stability harmonic source. .

The purpose of the present invention is. improving the accuracy of simultaneous conversion into the active value of both components of the measured complex resistance.

2

This goal is achieved by the fact that a second exemplary element is inserted into a measuring circuit containing a branch composed of a series-connected measured complex resistance and a sample element that is uniform to one of the measured components of the resistance, the other terminal of which is connected to one of the harmonic signal generator terminals. Uniform other measurable component of the impedance, included. Between · the second clamp of the harmonic signal generator AND another clamp measured complex resistance. ,

The introduction of a second exemplary element, uniform with another measurable component of the impedance, connected between the free clamps of the harmonic source / impulse source and the measured impedance, allows one to increase the accuracy of the conversion of the second measured (homogeneous newly introduced exemplary element) component of the impedance by eliminating the accuracy conversion from the frequency deviation of the harmonic signal generator and reduce frequency stability requirements * this generator.

761914

FIG. 1 shows a measuring circuit, in FIG. 2 - its circular diagram. The measuring chain contains an exemplary element. homogeneous active component 2. of the measured complex 5 resistance 2, 3, exemplary element 4, homogeneous reactive component 3 of the measured complex • resistance 2,

3, and a harmonic generator 5.

By removing various stresses from a ^7- dimensional solid circuit and appropriately treating them, one can obtain in one way information about the magnitudes of both components of the complex resistance, and their relation Oego; and a b blu change 15. As can be seen from the analysis of the pie chart (Fig. 2), the output signal proportional to the magnitude of any measurable component, as well as the magnitude of абсолют ee absolute or относ relative change 20 depends on the size of the other measurable component or its changes. In addition, The “dependence on the magnitude, frequency,” and ““ D0v'i'aggy ",“ amy DyudyG and ”ChaitoD ^7th ~ 'Nrn'atho ^ T ^ Zhb'ny-” 25 / Chssnoy is connected

........... The use of the proposed "measure-

body circuit for simultaneous use of measured components

of development, which is especially important in the development of secondary i.e0brazo © for the process control system.

Claims (1)

Claim "" A measuring circuit containing a branch composed of a series-connected measured resistance and an exemplary element, homogeneous to one of the measured components of the complex resistance, the other clip of which is connected to one of the terminals of the harmonic signal generator, that, in order to improve the accuracy of the simultaneous conversion of the two components of the measured complex resistance, a second exemplary element is introduced into it, which is homogeneous to the other measured component ompleksnogo resistance included .mezhdu second / per zhimom harmonic signal generator and another clamp komlleksnogo measured resistance.