SU1228041A1 - Apparatus for measuring impedance - Google Patents

Abstract

The invention can be used to measure impedances, including those under high voltage. The purpose of the invention is to improve the measurement accuracy. The device contains measurable impedance 1, 2, adjustable impedance 3, 4, load resistance 5, switch 6, source 7 of charged particles, accelerator electrode 8, systems, electrodes 9, 10 of the energy analyzer, beam position sensors 11-14, amplifiers 15-18, null indicator 19, phase meter 20, power supply 21. Accuracy increase is achieved by introducing amplifiers 15-18, load resistance 5, key 6, null indicator 19, phase meter 20, and the indicator of the voltage dividing coefficient is fulfilled as a source of charged particles 7 and a charged particle energy analyzer. 1 il. from € (L

Description

The invention relates to electrical engineering and can be used to measure impedances, including those under high voltage.

The purpose of the invention is to improve measurement accuracy.

The drawing shows a block diagram of the device.

The device contains measurable impedance ,, 2, adjustable impedance 3.5 resistance 5 load, key 65 source 7 charged particles electrode 8 accelerating system 1 edge electrodes 9 and 10 analyzer energide sensors beam position 11-14 amplifiers, null indicator 195 Phase meter 20 and a power source 21,. A power source 21 through a source of charged particles 7 J measured 1 ,, 2 and adjustable 3.4 impedances and resistance 5 load shunt key 6, is connected to the common bus device. The first electrode 9 is connected to the common point of the measured 1.2 and adjustable 3.4 impedances and the second input of the phase meter 20, the sensors 11-14 of the beam position are connected to the inputs of two groups of two ISIS amplifiers, and the outputs of the amplifiers 15 and 16 are connected to the resistance 5 loads and a key in, and the outputs of the usteers 17 and 18 are connected to each other, first by the input of the phase meter 20 and the input of the null indicator.

The common bus of the device is connected by the first output of the power supply 21, the electrode 85 by the second electrode 10, the common input of the amplifier 15-1 b, a phase meter and a zero indicator

The device works as follows.

When measuring the impedance Z on an alternating current, the source 7 of charged particles must ensure the emission of positive and negative parts. Up to measurements on the direct current, the source 7 may be an electron gun

As an energy analyzer, a high-energy cylindrical energy analyzer is used.

It is known that in the energy analyzer of a cylindrical type, the beam trajectory is located on. arc of average radius, if a deflecting voltage is applied between its electrode 9 and 10: SU ,, determined by the energy of charged particles qU (where q is the charge of particles in the beam) and the energy analyzer conversion coefficient

S 21p (1 f)

2d R

0

five

0

five

0

where d is the distance between the electrodes

9 and 10:

 L. - the radius of the internal electrode 10.

1: When increasing, the voltage U of the source 21 enters the divider from impulses 1-4 and load 5 and the accelerating system from source 7 and electrode 8. A beam of charged particles enters the energy analyzer,

The position sensors of the beam 11-14 are placed in the span of the analyzer, as well as relative to the arc of average radius so that when the differences between the transfer coefficient K of the divider and the conversion factor S of the energy analyzer are reduced, the beam falls on the sensors located farther from the input of the energy detector , and did not fall on the sensors placed in front of them.

By ensuring the condition K - S, the beam shifts towards the electrode 9, and at K S towards the electrode 10, so that the phases of the voltages acting at the outputs of the amplifier 15 or

,; 16, and also 17 or 18, in these cases are close to opposite

in the process of measuring the impedance 1, 2 Zp of adjusting the components R, C of the adjustable shoulder of impedances 3.4

q dekl el provide beam offset to the path of the arc of the average radius of the energy analyzer, while in the process of this adjustment the signal at the input of the amplifier 15 disappears, and then when the beam is placed between sensors 13 and 14, the signal disappears, acting at the input of the amplifier 16. Indication of the weekend; the voltages of the amplifiers 15 and 16 and the beam offsets are carried out

By means of a null indicator 19 and a phase meter 20e measuring, a phase shift occurring between the EXTERNAL voltage of the amplifiers 17 and 18 and the voltage on the electrode 9 of the energy analyzer.

S When establishing zero or small readings of the null indicator 19, the load resistance 5 is short-circuited with a clamp 6, and then complete

31228041

The adjustment of R, C in the shoulder of the impedances 3.4 of the divider from the impedances 1-4, providing zero readings of the azometer 20 and the zero indicator 19.

Equality between the voltage divider K and the voltage divider and the energy analyzer S conversion coefficient

But you are still in a position of at least two days after another, and one day after another.

S

Zh

+ Zh

which takes place while providing zero indications of the null indicator 19, allows to determine

g „

1-s

D)

(2)

By rewriting this equality separately for real and imaginary parts, we find the active and reactive impedance values in the shoulder from impedances 1.2 and the voltage divider from impedances 1–4.

When equating the real components of the left and right parts (2) have

Rx

1-s

R,

Cx

with.

and equating the imaginary parts indicates the constant equality of time Cj, R CR of the divider, so that

S 1-S

Claims (1)

Invention Formula A device for measuring impedances containing a divider with measured and adjustable impedances, an indicator of the division factor ten 15 20 25 thirty five four voltage source, one output of which is connected to a common bus device, which is different in that, in order to improve accuracy, two groups of two amplifiers are introduced into it, the load resistance, the key, the zero indicator and the phase meter, and the coefficient indicator dividing the voltage is made in the form of a source of charged particles and an energy analyzer of charged particles, the second output of the voltage source being connected to the first input terminal through a source of charged particles, the second input terminal being connected to the first deflecting electrode, The first output of the regulated impedance and the second input of the phase meter, the other output of the adjustable impedance are connected to the key, the load resistance and the outputs of the first amplifiers, the outputs of the second group of amplifiers are connected to each other by the first input of the phase meter and the input of the null indicator, the first inputs of the first amplifiers of both groups are interconnected and The first sensor of the position of the trajectory of charged particles, respectively, connects the second inputs of both groups of first amplifiers with the second sensor of the position of the trajectory, the first and second inputs of amplifiers of both groups with the third and fourth trajectory position sensors, the common bus is connected to another deflecting electrode of the analyzer of the energy of charged particles, the common outputs of all amplifiers, the second output of the load resistance, the key, the common inputs of the phase meter, zero 40 system indicator. and an accelerating electrode