SU613252A1 - Electric circuitry testing arrangement - Google Patents

Description

one

The invention relates to the field of electrical measuring equipment and can be used to create devices for monitoring the electrical compatibility of electrical circuits.

It is known a device for measuring the parameters of the complex resistance, which contains a comunor of currents, one winding of which is indicator, the common point of opposite ends of the other two windings is connected to the junction of the sample elements, and the fourth is connected to its sample element and one end of the HIbibimpi terminal of the measured object with side of the power supply. The auxiliary winding is connected to the additional reference element and the potential clamp of the object to be measured 1.

A disadvantage of this device is the low reliability of the control.

Closest to the invention is to the technical essence of the device for testing electrical circuits, which contains a power source to which the power diagonal of the first measuring bridge is connected, containing in its arms clamps for connecting the measuring resistor and main resistors, parallel to one of which in one arm of the first measuring bridge through the key element includes the first bypass resistor, and a null-organ 2 is included in the measuring diagonal of the measuring bridge.

A disadvantage of this device is the impossibility of determining the nature of the damage while monitoring several circuits.

The purpose of the invention is to extend the functionality while monitoring several circuits.

For this purpose, additional measuring bridges, analogous to the first measuring bridge, and a switching unit are introduced into the proposed device, and the two adjacent arms of each measuring bridge are inserted via an additional resistor, the first terminals of which are connected to one of the measuring diagonal ends of this bridge, the second output of the first an additional resistor is connected to the main resistor of this

shoulder, and the second output of the second additional resistor through the switching unit and the measuring resistor is connected to the main resistor of this shoulder, and in this loop the series connected in parallel

to the switching unit, measuring and basic resistors, a second shunt resistor is connected through the second key element. In the drawing, a functional diagram of the device for checking electrical

chains.

It contains: power supply 1; measuring bridges 2, 2, ..., null-bodies 3, 3, ..., switching unit 4; control unit 5; key elements 6, 6, ..., b, 1, 1, .... 7.

The first measuring bridge 2 consists of the main resistor R of the first shoulder, the first additional resistor of the second additional resistor K, the main resistors 4, n 5 in the arms of the bridge. Similar to bridge 2 measuring bridge 2 contains a main resistor, the first additional resistor 7 of the second bridge, the second additional resistor 8 of the second bridge; main resistors and -R10 in the shoulders of the second bridge.

Resistor 11 is measuring and input to control object 5. Resistor 12 is the main resistor of the other pole of measuring bridge 2, and resistors H13-16 serve to bypass the shoulders of measuring bridge 2.

The device works as follows.

If the circuits of the control object 5 are intact, then after connecting it through the switching unit 4 to the measuring bridges 2-2, the latter are balanced, and the voltage on the resistors and 7 to 12 arms of the bridge, and also on the measuring resistor 11 is

, K2 ikz, ki, k12, (1)

where

Upon a command from a null organ 3 to dry, the transition to checking the next group of chains is made.

When all or part of the object 5 of the control is faulty, the balance of the corresponding measuring bridges 2-2 is disturbed.

If there is a malfunction of the type of excess connection between simultaneously tested circuits, the above relation of voltages will change, which the nullorgan 3 will fix.

For example, with .RQ and R7 R8, the difference in voltage drops in the arms of the measuring bridge ... 2 at the above-mentioned security connection with measuring bridge 2 will be

d

 (). () +

. (), (2)

+ Rl-R6 + 4: Rl-R2-R6

where E is the voltage of the power source; where

D UKI + UK - UK UKU - URU.

For measuring bridge 1

BUT./

(3)

R

where

W., and KB + Uji7 - URZ - UKU - UKU If additional resistors 2 and 3 or 7 and 8 are missing, then AL / i AL2 0 and the fault will not be detected.

The application of the proposed device allows to significantly speed up the search and elimination of damage to electrical devices and circuits.

Claims (2)

Invention Formula A device for checking electrical circuits, containing a power source to which the diagonal of the power supply of the first measuring bridge is connected, containing in its arms clamps for connecting the measuring resistor and main resistors, parallel to one of which in the first measuring bridge the first shunt resistor is connected The measuring diagonal of the first measuring bridge includes a nullorgan, characterized in that, in order to expand the functionality with one time control of several chains, introduces additional device measuring bridges similar to implement a first measurement bridge and the switching unit, and in the two adjacent arm of each measuring bridge introduced by a further resistor, the first terminals of which are connected with one of the vertices of the measuring the diagonal of this bridge, the second output of the first additional resistor is connected to the main resistor of this shoulder, and the second output of the second additional resistor through the switching unit and the measuring resistor connect to the main resistor of this shoulder, and in this shoulder in parallel to the series-connected switching unit, measuring and main resistors through the second key element included the second shunt resistor. Sources of information taken into account in the examination 1. USSR author's certificate №437970, cl. G OIR 17/10, 1972. 2. USSR author's certificate No. 427286, cl. G 01R 1/02, 1972.