SU819745A1 - Method of measuring component values of two-terminal network complex resistance - Google Patents

Description

(54) METHOD OF MEASURING THE VALUE OF COMPONENTS OF THE COMPLEX RESISTANCE OF THE TWO-POLE

The invention relates to a measurement technique, namely to the field of measurement and control of the components of the impedance of a two-pole network, and can be used to build automatic meters for the absolute value of any of the components,

There is a known method for separately measuring active and reactive components of an impedance using an AC bridge, in which an exemplary element is connected in series with the measured impedance into an AC power supply circuit l.

However, a significant drawback of the method is the dependence of the measurement results on the frequency instability and voltage amplitude of the source, power, on the change in the unmeasurable component of the bipolar impedance.

The closest to the invention is a method for measuring the values of the components of the two-pole complex, allowing chthium to simultaneously and separately measure the active and reactive

the active components of the complex two-pole regardless of the absolute value and change of the non-measurable component, as well as regardless of the instability of the amplitude and frequency of the supply voltage of the measuring circuit And

According to the method, the type of conductivity of an exemplary two-pole uniform type of conductivity of the measured component of the studied bipolar circuit is selected, a signal is formed (with a sequential replacement circuit of the measured two-terminal network, proportional to the projection of the voltage vector removed from the tested two-pole network of the sample vector of a two-terminal network). The relation of this signal to amplitude 0, the value of the voltage on an exemplary two-terminal network, the value of which determines the value of the measured composition kvdey. In the measurement of two-terminal integrated component kitsey performed in parallel displacement, form a signal vector projection proporg aionalny voltage taken from the two-pole model, a vector voltage UA

0, the following two-terminal and determine the ratio of this signal to the amplitude value of the voltage on the measured two-terminal. In addition, an increase in speed and measurement is achieved by measuring the second component of the two-port circuit being studied with a sequential replacement circuit, when the phase of the voltage vector taken from the sample two-port is turned on Ill / 2 to form a signal proportional to the projection of the voltage vector taken from the two-pole network being studied the rotated voltage vector determines the ratio of this signal to the amplitude value of the voltage on the sample two-pole, and when measuring the second component, we investigate th ka integrated bipolar performed in parallel cx IU substitution vector phase voltage taken from the test two -pole, rotated ± 1c / 2 for1Airuyut; The signal proportional to the projection of the voltage vector ::, taken from the model two-terminal device to the rotated voltage vector from the two-terminal device under study, determines the ratio of this signal to the amplitude value of the voltage on the two-terminal network under study. measurements, obuszh) injected by finding the projection of the stress vectors. The aim of the invention is to reduce the measurement time. This is achieved by forming two signals, the first of which is proportional to the instantaneous value of the voltage taken from the tested two-port, and the second from the exemplary two-pole, when it reaches the extreme value of the voltage on the outgoing two-pole. signals, the value of which is judged on the value of the measured component. In addition, when measuring the second component of the studied complex resistance of a two-pole, the first signal is generated when the extreme value of the voltage on the measured two-pole is reached, and the second is at the time of transition through the zero level on the measured two-terminal. Figure 1 shows the structural a diagram of a device for measuring the magnitudes of the components of a two-pole shlex pole that implements the method of FIG. 2 is a 14-loop circuit for sequential replacement of a complex two-pole network and its circles agramma; in FIG. 3, the same for a circuit for replacing a two-port cell and its circular amma; Fig. 4 shows timelines for a sequential allelic replacement circuit of a lump two-terminal network, L is the voltage vector of the measuring circuit; c is the vector of voltage drop taken from the model two-port circuit with a sequential replacement circuit or a measured complex two-pole circuit under a parallel replacement circuit; e is the vector of voltage drop taken from the measured complex two-terminal circuit with a serial replacement circuit or an exemplary two-pole circuit with a parallel replacement circuit; C is the potential point corresponding to the top of the measuring circuit; , circles equilibrating in generalized terms; C is the phase shift of the voltage drop vector across the sample (measured) bipolar circuit relative to the voltage supply vector; the phase shift of the voltage drop vector on the sample (measured) two-pole relative to the voltage drop vector on the measured (sample) two-pole; - the point corresponding to the moment. a voltage value with a sequential replacement circuit of the measured complex two-pole, or an instantaneous voltage U with a parallel replacement circuit, taken at the time the voltage reaches UQC with a series cxeivts replacement, or a voltage U = jp with a parallel replacement circuit of its extreme value }, is the point corresponding to the instantaneous value of the voltage and with the convincing scheme of replacing apr of jUg while parallelly replacing the complex lHter taken at the time of the ode through the zero level, Uotc 5 sequence or replacement scheme or U-LO. The measurement of the component of the two-pole network, the proportion of the in-phase component relative to the model nickname, will be

1 about

hu

Where

be cos Ts1 ku,

ace

and for a complex two-pole component proportional to the square component relative to the reference element, will be

1-P

Ci

be sin (

Kfi

ace

Equations (1) and (2) will also be valid for a parallel replacement scheme with the only difference that the C, 5 and y parameters will have the dimensions of conductivities, and in the measuring circuit the bipolar networks must be reversed.

The device contains a measuring circuit 1 composed of serially connected exemplary (measurable) two-terminal 2 and measurable (exemplary) two-terminal 3, a sinusoidal voltage generator 4, matching blocks 5.6; pulse shaping unit 7, key 8, switching unit 9, dividing units 10, 11.

The device operates as follows: the voltage and taken from the model, for example, with a sequential replacement scheme of the bipolar 2, through the matching unit 5 is fed simultaneously to the inputs of the key 8 and the forming unit of pulses 7, and the voltage taken from the measured two-pole 3, through the matching unit

6 is provided to the information input of the casing unit 9. From the first output of the pulse shaping unit

A 7-bit pulse generated when the voltage Uoic reaches its extreme value goes to the control input of the key

8 and the switching unit 9, and a narrow pulse from the second output of the pulse shaping unit 7 is fed to the second control input of the switching unit 9. At the output of the key 8, we receive a signal in the form of a narrow pulse proportional to DOIC so that it simultaneously arrives at the first. the inputs of the dividing units 10, 11, and from the first output of the switching unit 9 a signal in the form of a narrow pulse proportional to. cosci. formed at the time when the voltage Ugc reaches its extreme value, is fed to the second input of the division unit 10, from the second output

: switching unit 9 narrow pulse.

proportional U.-s i PC) is supplied to the second input of the division unit 11.

As can be seen from the time diagram shown in Fig. 4 (a, b), the formation of instantaneous values of voltages taken from an exemplary measurable two-pole circuit is carried out during a half-period of the supply voltage, which significantly increases the measurement speed. complex bipolar.

0

At the output of dividing unit 10, a signal is obtained that is proportional to the in-phase component of the complex two-terminal device relative to the model two-terminal device / a at the output of the unit

The 5 divisions 11 are proportional to the quadrature component of the complex two-terminal network relative to the model two-terminal network.

To obtain information on the absolute value of the measured component of the complex two-terminal network, it is necessary to multiply the resistance value of the model two-terminal network by the value of the numerical value obtained from the output of the unit.

5 divisions.

The use of the proposed method for measuring the component values of a complex two-pole provides a high

0 measurement speed, which allows the use of devices developed on the basis of this method in the systems of automated control and management of technological processes.

Claims (2)

1. A method for measuring the components of the complex resistance of a two-port network, which consists in that between a series power supply and an exemplary two-circuit network, the conductivity type of which is uniform to the conductivity type of the measured resistance component of the two-pole system, made according to a parallel replacement circuit, connects the two-pole component under study, connected to the test two-pole component made according to a parallel replacement circuit, connects the test two-pole component of the two-pole system, which is made in a parallel replacement circuit, connects the test two-pole component of the two-pole system, which is made according to a parallel replacement circuit, connects the test two-pole component of the two-pole system, which is made according to a parallel replacement circuit, connects the test two-pole component of the two-pole system that is made according to a parallel replacement circuit and connects the test two-pole component to the two-pole system that is being measured according to a parallel replacement circuit. characterized in that, in order to reduce the measurement time, two signals are generated, the first of which is proportional to the instantaneous value voltage removed from the second bipolar circuit being studied, and the second one - from the model bipolar circuit and the moment of reaching the extreme voltage value on the measured bipolar circuit, determine the ratio of the first and second signals, by the value of which the value of the measured component is judged. 2. Method according to Claim 1, characterized in that, when measuring the components of the impedance of the bipolar circuit under investigation, the first signal is formed when the extreme value of the voltage is reached on the measured two-pole, and the second is at the time of passing through the zero voltage level on the two-port being measured. Sources of information taken into account in the examination 1. Authors certificate of the USSR 121862, G 01 R 17/10, 1957. 2. USSR author's certificate on application 2380702/21, Cl. 01 R 27/02, g Fp Fig-3 BUT