SU1413561A1 - Method of locating an unstable electric connection - Google Patents

Abstract

The invention relates to instrumentation engineering and can be used to search for unstable electrical connections. The circuit of the invention — an increase in the accuracy of determining the location of an unstable electrical connection — is achieved by increasing the noise immunity. Another circuit — an extension of functionality — is achieved by detecting unstable electrical connections located between parts of the monitored electrical circuit that have equal resistance. A device that implements the method contains a controlled electrical circuit 1, a vibro-stent 2, a two-channel capacitive sensor 3, a differential amplifier 4, an effort-; 5, indicator 6. When performing measurements, the monitored electrical circuit is subjected to vibration on the shaker table. The location of the unstable compound is determined by the indicator. 1 il. (L

Description

-

SA SP

The invention relates to instrumentation engineering and can be used to search for unstable electrical connections.

The aim of the invention is to improve the accuracy of determining the location of an unstable electrical connection by increasing noise immunity and expanding functional capabilities by detecting unstable electrical connections located between parts of the monitored electrical circuit having equal resistances.

The drawing shows the block diagram of the device that implements this method.

The device contains a controlled electrical circuit 1, a vibrostand 2, a two-channel capacitive sensor 3, a differential amplifier 4, an amplifier 5, an indicator 6, and the controlled electric circuit 1 is fixed on the vibrostand 2, the first and second outputs of the sensor 3 are connected respectively to the non-inverting and inverse vertically to the inputs of the differential amplifier 4, the output of which is connected to the input of the amplifier 5 whose output is connected to the input of indicator 6.

Monitored circuit 1 is put into working condition (supply voltage is applied) and is subjected to mechanical influence created by shaker 2, and capacitive sensor 3 is moved over different circuits of controlled circuit. In this case, a signal is induced in the electrodes of the sensor 3, the value of which is determined by the component of the electromagnetic radiation field of the circuit containing an unstable electrical connection. When both electrodes of the sensor are on one side oTj of the location of the unstable connection, a common-mode signal is induced in it, and in the case when the unstable connection falls into the gap between the electrodes. - antiphase ny. The signal from the sensor electrodes is fed to the direct and inverse No. 1 inputs

differential amplifier 4. Since differential amplifier 4 suppresses common-mode signals and amplifies antiphase signals, when sensor 3 assumes a position where a poor-quality connection is between its electrodes, a signal appears at the output of the differential amplifier signals at a different position of the sensor 3.

From the output of the differential amplifier, a 4-channel signal is amplified by amplifier 5 and fed to indicator 6, the maximum indication of which determines the location of the unstable connection.

Claims (1)

Invention Formula A method for determining the location of an unstable electrical connection, which consists in subjecting a controlled electrical circuit to mechanical stress, adopts an electrical component of electromagnetic radiation along a controlled electrical circuit, characterized in that, in order to improve the accuracy of determining the location of an unstable electrical connection by increasing the noise immunity and expansion functionality by detecting unstable electrical connections located between the sections of the monitored electrical circuit, having equal resistance, the electrical component is taken simultaneously at two adjacent points of the monitored electrical circuit, the first of the accepted components for cix is subtracted from the second component, the resulting difference is increased at a number of points along the controlled circuit, they compare with each other, and the location of the unstable electrical connection is determined by the maximum value from the obtained pa3HocTei.