SU783697A1 - Method of automatic equalizing of a.c. bridge for measuring one component of wector admittance - Google Patents

Description

Delivered gel is achieved by the fact that in the known automatic method (Balancing an AC bridge to measure one component of complex conductivity, based on balancing the AC bridge by eMoI component of this conductivity with a current equal to the moduli of the difference of currents flowing through the measured and sample conductivity and including the operation of determining the direction of equilibration, in each step of balancing the AC bridge, the module of its CER signal is first measured equilibrate, and then make a regulating effect, the magnitude of which vibrates directly proportional to the result of the previous measurement.

In accordance with the proposed technical solution, in each discrete step of equilibrating the bridge, an equilibrium state is made not on an olive scale, but on a few steps at a time. In this case, to determine the required amount of LjaroB, the amplitude of the signal of the disequilibrium signal is initially measured, and then the required number of ions is directly proportional to the 1M measurement result.

: The drawing shows a flowchart of Jost, balanced by the proposed method.

The device contains a sinusoidal voltage generator 1, the pavement measuring circuit 2 itself, equalized by switching its elements, the analyzer 3 modulation increments of the waveform (for example, voltage) unbalance the measuring bridge cxeNsu, three: - reagent reverser 4, reversive the counter 5, the voltage converter b in the number of pulses, the modulator 7. The operation of the device is synchronized by the control unit 8.

Balancing the bridge circuit and the circuit 2 according to the proposed method is carried out in cycles. First, the analyzer 3 memorizes the current value of the modulus (amplitude) of the unbalance voltage of the bridge measuring circuit 2. When a signal appears, the modulator 7 is turned on at the output of the control j and the analyzer 3 determines the sign of the modulation prir1 ;; There is no imbalance in voltage. The positive sign of this increment means that the modulation effect on the pavement measuring circuit 2 is carried out by the modulator 7 in the direction away from the equilibrium state, and the negative sign in the direction close to equilibrium. Accordingly, the logic of the analyzer 3 is such that with a positive sign the modulation increment of the voltage unbalance of the bridge measuring circuit, trigger 4 reverses a pulse that changes the counting direction of the recursive counter 5 to the opposite, and The negative sign of the state of the reverse trigger remains unchanged. Thus, the pulse at the output of the control unit 8 ensures that the counting direction is set to sides of equilibrium for an arbitrary initial state of the trigger 4 reverse.

At the same time, a non-equilibrium signal is applied to the voltage converter 6 in the number of pulses, built, for example, on the basis of a variable frequency pulse generator controlled by the voltage. When a pulse appears at the output b of control unit 8, this converter produces a finite sequence of pulses, the number of which is proportional to the imbalance signal modules of the bridge measuring circuit 2. The pulses of the converter 6 are fed to the count input of the reversing counter. When the state of the reversible counter changes, the balancing elements in the bridge measuring circuit are switched, which brings the bridge closer to equilibrium. At the end of the pulse sequence counting, the device is ready to work out the next equilibration cycle, carried out by ALA to refine the state of equilibrium, if this clarification is necessary. A sign of attaining equilibrium is to reduce to zero, with a given accuracy, the imbalance of the bridge measurement circuit.

Using the proposed method of automatically balancing an AC bridge to measure one component of complex conductivity provides the following advantages over existing methods:

a) increase the speed of the bridge by 2 times,

b) ensuring the independence of the time of equalization from the degree of inequality within one decade.

Claims (2)

Invention Formula A method of automatically balancing an ac bridge for measuring one component of the complex conductivity, based on balancing the ac bridge with an immeasurable component of this conductor with a current equal to the modulus of the difference of the currents flowing through the measured and exemplary suspicion at which the direction balancing, in contrast to the fact that, with the aim of noBhiujeHHH Systromode, in each step of balancing an alternating-current motor is initially measured the modulus of its signal imbalance, and it is carried out regulating effect, whose magnitude is directly proportional to the selected measurement result produced earlier. Sources of information taken into account in the examination 1, Kneller V.Yu. Automatic meters of complex values with a coordinated equilibrium of M., Energii; 1975, p. 212. 2. Authors. USSR certificate number 481847, 1973, cl. G 01 R 17/10. .