SU566205A1 - Converter of parameters of three-component two- - Google Patents

Description

(54) CONVERTER PARAMETERS OF TWO-TEMPEREMENT TEAMS

.

The scientific research institute, an amplifier whose input is connected to one of the terminals for connecting the object under investigation and one of the terminals of the first exemplary capacitor and the second exemplary capacitor, another output of the first exemplary capacitor is connected to the output of the main controlled voltage divider, the control input of which is connected to the amplitude output. the envelope detector with the amplifier output connected to one of the inputs of the voltage ratio meter and one of the inputs of the phase-sensitive indicator, the output of which is connected a control input of an additional control voltage divider, and a voltmeter, a third exemplary capacitor and an exemplary resistor, as well as a current ratio meter, are introduced, the source output of the frequency-modulated signal is connected to a terminal to connect the object under test and to the input of the main controlled voltage divider, and the output the latter is connected to a vertical meter, in addition, the output of the amplifier is connected to one of the inputs of an additional controllable divider | voltage and to another input of a voltage adder, in the course of which is connected to one of the inputs of the current ratio meter and to the other input of the phase sensitive indicator through an exemplary resistor, while another input of the current ratio meter over the third exemplary capacitor is connected to another input of the voltage ratio meter and to the output of an additional controlled voltage divider, moreover, the specified output of the latter is connected to another output of the second exemplary capacitor, in addition, the output of the current ratio meter is connected to the input of the amplitude detector s.

On the whole, there is a structured electrical circuit for converting parameters of three-element two-terminal networks.

The device (Contains-source 1 of the frequency-modulated signal connected to the inputs of the main controlled divider 2 voltage, adder 3 voltages and through the studied two-terminal 4 (containing conversion elements, such as capacitor 5, resistor 6 and capacitor 7) to the input of the amplifier 8. Input the amplifier 8 is connected through the first exemplary capacitor 9 to the output of the main controlled voltage divider 2 and the input of a voltmeter 10, and through the second exemplary capacitor 11 to the output of the additional controlled voltage divider 12 1 Valid ratio meter 13 voltage. The output of amplifier 8 is connected

with the input of an additional controlled voltage divider 12, another input. the voltage ratio meter 13, the phase-sensitive indicator 14 input and another voltage adder input 3, the output of which is connected to another phase-sensitive indicator 14 input and an azcase resistor 15 to the current ratio meter input 16, another input of which is connected to the third reference capacitor 17 the output of an additional controllable voltage divider 12, the control input of which is connected to the output of the phase-sensitive indicator 14. The output of the meter 16 is the ratio of currents through the amplitude detector 18 round the is connected to the control input of the main controlled voltage divider.

The Converter operates as follows.

When satisfied

U, j (oC5 + irj (-K, j) J6 :) C9 0, (j, :)

where IT is the voltage source of 1 frequency modulated signal. ;

Cj is the capacity of the element 5 to be converted;

C - e psos exemplary capacitor 9,

K --N,

g if /

(2)

k.

ij is the transfer coefficient of the main controlled voltage divider 2 j

 the voltage at the output of the main controlled voltage divider 2; The output voltage of the amplifier 8 is:

. - icOCa u

(3) g -U, Vji3c;

the capacitance of the exemplary condensateNncocTb condenser 7; resistance of resistor 6; the transfer coefficient of the supplemented divider is 12 eg.

k

.

(four)

fulfilling the conditions

(five)

; iz + th

(6)

Claims (2)

Uj- voltage at the output of the adder 3 voltages achieved by adjusting the transfer coefficient Kjj of the additional controlled depot 12 is strained by the signal from the output of the phase-sensitive indicator 14, the expression 1 1 JWC JWC, jt ,, j -TJ. “Juc. Output signal A of the meter 13. Ratio of the voltage measuring ratio) taking into account expressions (8) and (4). Output signal A of the meter 16 current ratio, measuring module P current ratio DJ and 3ifi current respectively through the sample resistor 15 and samples the capacitor 17 is equal to A - lilJ | 7 T, 5U, 2JWC, 7 Substituting expressions (3), (4) and (9) into equality (11), we obtain As can be seen from expressions (10) and (12), Both the output signal of the meter 13 is relative to the voltages and the output signal of the gauge 16 of the current ratio are frequency independent when the condition (1) is met. If condition (1) is not met, then the output signals A and A become frequency-dependent, and the amplitude envelope detector 18 with its output signal changes the transmission coefficient K o of the main controlled voltage divider 2 until condition (1) is satisfied A and A are frequency independent. The voltage and at the output of the main control of the voltage divider 2, measured by a voltmeter 1O, taking into account (1) and (2) is J. 2 - g; 9 (1 3) As can be seen from the expressions (Yu), (12 ) and (13), the converter allows to obtain output signals proportional to the magnitude of CT, R and Su, respectively. If the transformable element 5 of the two-port 4 under study is active resistance or inductance, then element 9 must be active or inductive, respectively. Claims of parameters of three-element two-terminal network, containing a source of a frequency-modulated signal connected to one of the inputs of a voltage adder, an amplifier whose input is connected to one of the terminals for connecting the object under study and one of the terminals of the first exemplary capacitor and the second exemplary capacitor, another output of the first reference capacitor is connected to the output of the main controlled voltage divider, the control input of which is connected to the output of the amplitude an envelope detector, wherein the amplifier output is connected to one of the inputs of a voltage relation meter and to one of the inputs of a phase-sensitive indicator, whose input is connected to the controller of an additional controlled voltage divider, and a voltmeter, characterized in that, in order to improve the measurement accuracy , a third exemplary capacitor and an exemplary resistor, as well as a current ratio meter, are inserted into it, the output of the frequency modulated-sigpal source being connected to a terminal for connecting the object under study and with the input of the main controlled voltage divider, and the output of the latter is connected to a voltmeter, in addition, the output of the amplifier is connected to one of the inputs of an additional controlled voltage divider and to another input of the voltage adder, the output of the latter is connected through one of the reference resistors to one of inputs of the current ratio meter and with another input of the phase-sensitive indicator, while the other input of the current ratio meter is connected to the other input of the voltage ratio meter via the third exemplary capacitor swing additional controllable voltage divider, said last output connected to the other terminal of the second capacitor model, in addition, the output current ratio measurer connected to an input of an amplitude envelope detector. Sources of information taken into account in the examination: 1. USSR author's certificate number 248065, class (t O1 R 27/02, 20.O2.68. 2.Avtorskoe SBIdedelstvo USSR № 538302 class. O-01 R 17/00, 21.05.74.  itS- G I1 5iiffit№ I fO w