SU855547A1 - Device for locating short circuit - Google Patents

Description

one

The invention relates to a measurement technique and can be used to automatically determine the location of a short circuit of two conductors of a printed circuit board with or without radio elements.

A device for determining the location of short-circuiting of conductors in multilayer printed circuit boards is known, comprising a generator, a magneto-sensitive probe, an amplifier, an indicator C 1.

A disadvantage of this device is the manual mode of operation, since the magnetically sensitive% itd is necessary to move along the path of the conductor being monitored, following all its bends.

The closest in technical essence to the present invention is a device for determining the short circuit location, containing a magnetically sensitive probe connected to the amplifier input, the output of which is connected to the indicator input, and a generator connected to a transformer, the secondary winding of which is connected to one pair of ends of monitored conductors L2.

The disadvantages of the known device are the manual mode of operation, since the magnetic sensor of the probe must be moved along the conductor route, and the reliability of determining the short-circuit location cannot be seen.

The purpose of the invention is to increase the reliability of determining the location of a short

ten . circuit two circuit board conductors.

 This goal is achieved by the fact that in a device containing a generator, the output of which is shunted by the transformer primary winding, the main secondary system is connected to one pair of ends of controlled conductors, a magnetically sensitive

20 probe connected to the input amplifier, the output of which is connected to the indicator, the transformer is provided with an additional secondary winding that is connected in a phased phase to the main

25 by the secondary winding, and the conclusions of the additional secondary winding are connected to the second pair of ends of the monitored conductors.

The drawing shows the structure30 of the electric circuit of the device.

The device consists of a generator 1, a transformer 2, a magnetically sensitive probe 3, an amplifier 4 and an indicator 5.

The device works as follows.

The variable signal of the generator 1 is supplied to the primary winding of the transformer 2 and excites alternating signals on its secondary windings. The secondary windings of the transformer 2 are connected to the monitored conductors anti-phase, the beginning of each secondary winding ncmKjnoKieHO to the different ends of one monitored conductor, and the end of each secondary winding to the different ends of the second controlled lead. With such a connection of the secondary windings of the transformer 2 controlled circuit forms two circuits with loop currents 1 and Igi. Circuit currents Ts and 1,2, flowed through a short-circuiting conductor, Cy1, are located in it and create a maximum electromagnetic field, which is detected by the magnetically sensitive probe 3, amplified by amplifier 4 and indicated by an inductor 5. The local maximum of the signal created by the short-circuiting conductor allows using a mechanical raster scan of a magnetically sensitive probe, to carry out, with a sufficiently high degree of reliability, an automated search and detection of a short circuit of two wires arrester PCB.

The proposed device provides an increase in labor productivity as a result of automating the process of determining the location of a short circuit of the conductors of a printed circuit board.

Claims (2)

1.Patent of France No. 2220796, cl. G 01 R 31/08, 1974. 2. Exchange of experiments in the radio industry, 1975, 1, pp.52-53 (prototype). WITH