SU1211656A1 - Apparatus for measuring parameters of complex non-resonance two-terminal network - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to expand the functional capabilities by measuring the parameters of the impedance of a two-element H-resonance two-pole network. The device is. holds a harmonic signal generator 1, exemplary two-terminal 2, 3 and 6, switches 4.1 and 4.2, researched two-terminal 5, matching blocks 8.1 and 8.2, block 9 synchronization, amplitude converters 10.1, 10.2 and 10.3, analog-digital converters 11. 1.11.2 and 1.1.3, interfacing units 12.1, 12.2, 12.3, microcomputer 13 and bus 14 for setting programs. The description shows a bridge measuring circuit and a vector diagram of voltages for a measuring circuit in the case of a capacitive sequence of a two-pole equivalent circuit, taking into account the complex load, 3 sludge.

Description

The invention relates to electrical measuring equipment, namely, devices for measuring two-terminal parameters,.

The purpose of the invention is to extend the functionality by measuring the impedance (conductivity) parameters of a two-element nonresonant two-pole.

FIG. 1 shows a pavement measuring circuit; in fig. 2 is a voltage vector diagram for a measuring circuit in the case of a capacitive series replacement circuit of a two-port network taking into account the complex load in FIG. 3 is a block diagram of a device for measuring parameters of a complex two-port network.

The measuring circuit contains a harmonic signal generator 1 connected in parallel to a branch made up of consecutively arranged homogeneous reference two

polar poles 2 and 3 (z (i (, and, og,) for switches 4.1 and 4.2, connected in series and model two-terminal 5 and 6 (z /} + jjj; Zj), load resistance 7

 J g De / y are the measurement parameters of the measuring circuit in generalized notation, Ugg, dL ED, and the voltages on the test 5 and exemplary 6 double poles before switching, Uj, j, the unbalance voltage before switching, and. , U., - voltage drop on the model 6 and 5 bipolar networks under study after switching, U, - unbalance voltage after switching; cf,, phase shifts U (.j and relative to Ifqf

A device for measuring the parameters of a complex two-terminal network (Fig. 3) contains a harmonic signal generator 1 connected in parallel to a branch composed of series-connected homogeneous model two-terminal networks 2 and 3, switches 4.1 and 4.2, series-connected two and two models 2 and 6, blocks 8.1 and 8.2 matching, block 9 summation, three amplitude converters 10.1, 10.2 and 10.3, three analog-1Ц1 fryovyh pre 11656

About the former 11.1, 11.2 and 11.3, three blocks 12.1, 12.2 and 12.3 interfacing, the micro-computer 13 and the bus i And the setting of programs.

5 The device works as follows.

In the first measurement cycle, when the harmonic signal generator 1 is connected to the measuring

10 circuit, the contacts of the switches 4.1 and 4.2 are in the initial position 1.

From the measuring diagonal, the unbalance voltage U is fed one time temporarily to one of the inputs of the summation unit 9 and through the matching unit 8.1. To the input of the amplitude converter 10.1, the voltage U

Bc}

common mode with power supply

and taken from the model two-terminal 3, is fed to the second input of the summation unit 9 and through the matching unit 8.2 to the input of the amplitude converter 10.3.

The signals from the outputs of the amplitude converters 10.1 and 10.3, proportional to the effective values of the voltages / th, / and, respectively, are fed to the inputs of the analog-to-digital converters 11.1 and 11.3, where they are converted into codes and through the blocks 12.1 and 12.3 mates enter the first and second microcomputer memory cells 13, respectively.

The output signal from the summation block 9, proportional to (Uj, i + U (jj), is fed to the input of the amplitude converter 10.2. From the output of the amplitude converter 10.2, the effective value of the voltage / i, 1 + + Uj, (. {, /, Converted analog -digital converter 11.2 into the code, through the block 12.2 interface

enters the next memory cell of the microcomputer 13.

After entering the information on the effective values of the voltages / Ucj / v / Ubd / into the corresponding memory cells of the microcomputer 13, it issues a command to transfer the contacts of the switches 4.1 and 4.2 to the position P,

The voltages U (.j, Uy, taken from the measuring circuit, and the voltage cot generated in the conversion cycle are subjected to transformations similar to that described, and.

the codes and the subsequent cells of the microcomputer memory 13 are brought in as codes.

In accordance with the program entered via the program setting bus 14, the microcomputer 13 calculates the parameters of the complex two-terminal networks using the algorithms described above and outputs the measurement result to an indication (digital printing)

Thus, a device for measuring the parameters of complex two-terminal systems compared with the prototype provides greater functionality, which allows them to be used in automated control control systems; quality technological processes.

Claims (1)

Invention Formula A device for measuring the parameters of a complex two-element non-resonant two-port network, comprising a harmonic signal generator, the outputs of which are connected to the first branch of the bridge consisting of two series-connected homogeneous first and second two-terminal networks, and through the first contacts of the first and second switches to the second branch consisting of serially connected terminals for connecting the tested two-port and the third model two-port, the second contact of the first switch is connected the first contact of the second switch and the second contact of the second switch connected to the first contac to The volume of the first switch, the output of the measuring diagonal of the bridge is connected to the input of the matching unit, characterized in that, in order to expand its functionality, a summation unit, a second matching unit, three amplitude converters, three analog-digital converters, three interface blocks, are entered into it, a microcomputer, the first top of the measuring diagonal of the bridge is connected to a common bus, the first input of the summation unit is connected to the second 15 top of the measuring diagonal of the bridge, and the second input is connected to the input of the second block matching and the first contact of the second switch, the output of the first matching unit through serially connected first amplitude converter, analog-digital converter and interface block is connected to the first input of micro-computer, the output of the summation unit through serially connected second amplitude converter, analog-digital converter and the interface unit of the sub-to the second input of the microcomputer, the output of the second matching unit through the serially connected third amplitude converter, nalogo-digital converter and interface unit connected to the third input of the microcomputer, controlled by the input of a microcomputer connected to the bus specifying programs, and a control output coupled to the controllable inputs of the first and second switches. 20 25 thirty 35 Editor M, Petrova Order 636 / A9 Compiled by V.Semenchuk Tehred 3.Paly Corrector and Circulation 730 Subscription VNIIPI USSR State Committee for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab, 4/5 Branch ShSh Patent, Uzhgorod, st. Project, 4 Phie. Z Proof-reader I.Erdeyi