SU1550444A1 - Device for checking contacting of electronic unit leads - Google Patents

Abstract

The invention relates to instrumentation technology and can be used in functional control systems of electronic components for pre-test control of the contacting of their outputs. The purpose of the invention is to improve the monitoring performance by simultaneously detecting failed contacts. The device contains a series of contact heads 1.1-1.N with a pair of contacts 2.1-2.N and 3.1-3.N on each contact pad 4 of the object 5 control, switch 6, logic unit 7 and elements 8.1-8.N of the display. Switch 6 contains keys 9.1-9.N with two groups of contacts each. Logic block 7 contains the source of the test signal (IMS) 10, the threshold element 11, the trigger circuit 12 and the sensor 13 of the presence of the object 5 control. Using switch 6, all monitored contacts 2.1-2.N and 3.1-3.N are combined in a series circuit to which test current is supplied from IMS 10. When contact 2.1-2.N or 3.1-3.N fails, test current flows through the shunting elements 8.1-8.N of the indication, indicating the failing contacts. With healthy contacts 2.1-2.N and 3.1-3.N, the trigger circuit 12 switches the switch 6, allowing further operation. When removing the object 5 of the control sensor 13 brings the device to its original position. 1 il.

Description

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The invention relates to instrumentation engineering and can be used in Functional control systems of electronic units for autonomous pre-test control of contacting of contact pads with the help of contact heads.

The purpose of the invention is to increase the productivity of the control while maintaining its reliability as a result of the simultaneous detection of failed contacts.

The drawing shows a diagram of the proposed device.

The device contains a series of contact heads 1.1-1.N with a pair of contacts 2.1-2.N and 3.1-3.N on each contact pad 4 of the object 5 control, switch 6, logic block 7 and

elements 8.1-8.N of the display, and contacts 3.1-2.N and 3.1-3.N are connected to the terminals of elements 8.1-8.N of the display and the corresponding inputs of the switch 6, two information outputs of which are connected to the corresponding inputs of the logic unit 7, N the outputs are connected to the outputs of the device, and the control input is connected to the output of logic block 7.

Switch 6 contains keys 9.1-9.N with two groups of contacts, and the control inputs of keys 9.1-9.N are connected to the control input of switch 6, the 2N inputs of which are connected to the corresponding moving contacts of keys 9.1-9.N the first and second normally open contacts of which are pairwise combined and connected to the corresponding N outputs of the switch 6, the first normally closed contact of the key 9.1 and the second of the key 9.N are connected respectively to

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five

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five

0

five

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DNOC 13, and the output - with the output of the logic unit 7.

Light-emitting AL307B diodes with a voltage drop at a junction not exceeding 2 V at a direct current of 10 mA were used as elements of the 8.1-8.N indications. The current of the IIS 10 is also chosen, which is simultaneously the indicator 8.1-8.N current and the control circuit current. IIS 10 is built on field-effect transistors of average power KP905A. As a threshold element 11, you can apply the comparator 521 series. The control unit 12 contains a photoresistor DNOC 13 amplifier, for example, an 140 series operational amplifier, a 561 or 564 series logic, and an output switch on a KT829 transistor. As keys 9.1-9.N miniature relays REC-11 can be used.

The device works as follows.

When the control object 5 is docked to the device, contacts 2 and 3 of each contact head 1 are contacted with the contact pads 4 of the electronic unit, and the first and second normally closed contacts of keys 9.1-9.N together with the moving contacts form in the initial state control circuit through which the current flows IIS 10.

Valid contacts 2.1-2.N, 3.1-3.N shunt the corresponding elements 8.1-8.N of the display, and if there is no contact on any of the contact pads 4, the current flows through the corresponding element 8.1-8.N display, causing it to glow.

Thus, simultaneous indication of all defective contacts detected during the connection

the first and second information outputs 45 of the object 5 controls. If the defective switches are switchboard 6, the second normally closed contacts of the keys 9.1-9, N-1 are connected to the second contacts of the same name of the keys 9.2-9.N.

Logic unit 7 contains a test signal source 10 (IMS),

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there are no contacts, the voltage on the IIS 10 is significantly less than the threshold for triggering the threshold element 1 1.

The trigger circuit 12 analyzes the output state of the threshold element 1 1 and, in the absence of a Disable potential, it includes keys 9.1-9. made direct access to the contact to the sites 4, objects 5, controls through the included normally open contacts of the keys 9.1-9.N.

the threshold element 11, the trigger circuit 1 2 and the sensor 13 of the presence of the control object 5 (DNOC), and the inputs of the logic unit 7 are connected to the outputs of IIS 10, one of which is connected to the installation input of the trigger circuit 12 through the threshold element 11, the reset input of which is connected to way out

object 5 control. If defective

there are no contacts, the voltage on the IIS 10 is significantly less than the threshold of the threshold element 1 1.

The trigger circuit 12 analyzes the output state of the threshold element 1 1 and, in the absence of a Disable potential, it includes keys 9.1-9.N, having made direct access to the contact areas 4 of object 5 of the control through the included normally open contacts of keys 9.1-9.N .

While the addresses of defective contacts are indicated by lightening the elements 8.1-8.N of the indication, the circuit

control of the remaining contacts continues to function normally, the test slip current flows to the non-disconnected contact pads 4 either through the working display elements or through the reliable contacts 2.1-2.N, 3.1-3.N heads 1 .1-1 .N while maintaining consistent control circuits.

In the presence of defective contacts, object 5 of the control is removed for correction. The device automatically permits testing of the control object 5 only if it is in reliable contact with all contact pads 4. When the control object is removed 5, the control station takes the device into the initial state (DN 9 I-9.N is de-energized).

The possible number of defective contacts detected during pre-test contact monitoring is significantly (by 1-2 times) less than good contacts. Therefore, the actual voltage acting on the contact pads 4 of the electronic unit, even if 2-3 defects are localized, is at the same time practically safe for the electronic unit itself.

In the event that the effect of a test current of the order of 10 mA can damage the electronic unit under test, it is necessary to reduce the current by several orders of magnitude and apply liquid crystal display elements that work, for example, on the lumen. When working with liquid crystal indicators, the IIS 10 should supply the control circuit with a small alternating current.

Thus, due to the simultaneous indication of all faulty contacts, the proposed device provides an increase in the control performance with a high degree of its

authenticity.

Claims (1)

Invention Formula A device for controlling the contacting of the electronic components, 0 five 0 containing N contact heads with a contact pair on each pin of the monitored block, a logic block, a switch whose information outputs are connected to the inputs of a logical 1 block, and N display elements, characterized in that, in order to increase the control performance while maintaining its reliability, N display elements are connected directly to the corresponding terminals of the N contact heads and to the corresponding inputs of the switch, the N outputs of which are connected to the corresponding outputs of the device, and the control the input is with the output of the logic unit, the switch contains N keys with two contact groups, the control inputs of the keys are connected to the control input of the switch, the moving contacts of the keys are connected to the corresponding inputs of the switch, the outputs of which are connected to the combined normally open contacts of the corresponding keys, the first normally closed contact of the first key and the second N-ro key are connected respectively to the first and second information outputs of the switch, the second normally closed contacts All keys, except N-ro, are connected respectively with the first keys of the same name with the following sequence number, the logic block contains a sensor for the test object, a test signal source, a threshold element and a trigger circuit, the first and second inputs of the logic block are connected to the first and second terminals of the test signal source, the first terminal of which is connected to the installation input of the trigger circuit via the threshold element, the reset input of which is connected to the output of the object presence sensor to ntrol and output - with output logic block. five 0 five 0