SU783722A2

SU783722A2 - Apparatus for monitoring electric wiring of printed circuit boards

Info

Publication number: SU783722A2
Application number: SU772481658A
Authority: SU
Inventors: Юрий Анатольевич Раутенберг; Самуил Исаакович Береславский; Александр Самуилович Береславский
Original assignee: Предприятие П/Я Г-4728
Priority date: 1977-05-03
Filing date: 1977-05-03
Publication date: 1980-11-30

Description

Изобретение относится к области электроизмерительной техники и может быть использовано для автоматизированного контроля печатных плат.The invention relates to the field of electrical engineering and can be used for automated control of printed circuit boards.

Известно контактное устройство, в котором контакты изолированы друг от друга и имеют отдельные отводящие проводники [1] .A contact device is known in which the contacts are isolated from each other and have separate outlet conductors [1].

Недостаток известного устройства сложность конструкции.A disadvantage of the known device is the complexity of the design.

Известно устройство для контроля электрического монтажа по основному авт.св. № 648919, содержащее блок последовательного переключения и замыкания испытуемых точек, блок измерения сопротивлений, состоящий из двух измерительных элементов с различными порогами срабатывания, логический блок, соединенный с выходами измерительных элементов, блок синхронизации, подключенный к блоку последовательного переключения и замыкания испытуе№лх точек и к блоку измерения сопротивлений, блок оператйвной памяти и переключатель, при этом выходы блока последовательного переключения и замыкания испытуемых точек подключены к адресным входам блока оперативной памяти, воспроизводящий выход которого соединен с переключа2 телем, записывающий вход с выходбм измерительного элемента, имеющего меньший порог срабатывания, а входы измерительных элементов соединены с 5 переключающим выходом блока последовательного переключения и замыкания испытуемых точек через переключатель [2] .A device for controlling electrical installation on the main ed. No. 648919, comprising a block for sequential switching and closing the test points, a block for measuring resistance, consisting of two measuring elements with different thresholds, a logic block connected to the outputs of the measuring elements, a synchronization unit connected to a block for sequential switching and closing the test points and to the resistance measurement unit, the operative memory unit and the switch, while the outputs of the sequential switching unit and the closure of the test points are connected to the address RAM th input unit that reproduces the output of which is connected to pereklyucha2 Telem, vyhodbm recorder input with a measuring element having a lower threshold, and inputs the measuring elements are connected to the switching output 5 sequential switching unit and the circuit test points through [2] switch.

Недостаток известного устройства 10 сложность конструкции.A disadvantage of the known device 10 is the complexity of the design.

Цель изобретения - упрощение устройства для контроля печатных плат.The purpose of the invention is the simplification of the device for monitoring printed circuit boards.

Это достигается тем, что в устройстве для контроля электрического мон15 тажа блок последовательного переключения и замыкания испытуемых точек выполнен в виде приводного узла, соприкасающихся с проверяемой платой прижимных контактов, которые располо2Q жены в одной плоскости перпендикулярно направлению перемещения проверяемой платы, соприкасающегося с нею •сплошного контактного поля, которое соединено с общим полюсом источника 15 питания, последовательного переключателя, который соединен с прижимными контактами и переключающим выходом блока, и делителя частоты, при этом к адресным входам блока операнд ;тивной памяти подключены выходы пос шедовательного переключателя и приходного узла, а к блоку синхронизации подключены последовательный переключатель и черезделитель частоты приводной узел, а также тем,что сплошное контактное поле выполнено в виде встречно расположенных проволочных щеток с приводным узлом для их взаимного поджатия, который соединен с делителем частоты и что сплошное контактное поле выполнено в виде токопроводящей жидкости, а прижимные контакты выполнены с приводным узлом для их командного поджатия к проверяемой плате и прижимные контакты и сплошное контактное поле разделены между собой перегородками.This is achieved by the fact that in the device for monitoring electrical installation, the block for sequential switching and closing of the test points is made in the form of a drive unit in contact with the tested circuit board of pressure contacts, which are located in the same plane perpendicular to the direction of movement of the tested circuit board in contact with it • solid contact field, which is connected to the common pole of the power source 15, a serial switch, which is connected to the pressure contacts and the switching output of the unit and the frequency divider, while the outputs of the serial switch and the input node are connected to the address inputs of the operand memory, and the serial switch and the frequency splitter of the drive node are connected to the synchronization block, as well as the fact that the solid contact field is made in the form of located wire brushes with a drive unit for their mutual preload, which is connected to a frequency divider and that the continuous contact field is made in the form of a conductive fluid, and the pressure contacts Nena with the driving unit to command them to compression of the tested circuit board and spring contacts and continuous contact field separated from each other by partitions.

На фиг. 1 изображена структурная электрическая схема устройства с ис-. .пользованием проволочных щеток в качестве сплошного контактного поля; на фиг. 2 изображена структурная электрическая схема устройства с использованием сплошного контактного поля в виде токопроводящей жидкости.In FIG. 1 shows a structural electrical diagram of a device with is-. . using wire brushes as a continuous contact field; in FIG. 2 shows a structural electrical diagram of a device using a continuous contact field in the form of a conductive fluid.

Устройство (см.фиг. 1) содержит проверяемую плату 1, блок 2 последовательного переключения и замыкания испытуемых точек, блок 3 измерения сопротивлений с.измерительными элементами 4 и 5, имеющими различные пороги срабатывания, логический блок 6, соединенный с выходами измерительных элементов 4 и 5, блок синхронизации 7, подключенный к блокам 2 и 3, блок 8 оперативной памяти и переключатель 9, причем выходы блока 2 подключены к адресным входам 10 блока 8 оперативной памяти, воспроизводящий выход 11 которого соединен с переключате. лем 9, записывающий вход 12 соединен с выходом измерительного элемента 4, имеющего меньший порог срабатывания, входы измерительных элементов 4 и 5 соединены с переключающим выходом 13 блока 2.The device (see Fig. 1) contains a test board 1, a block 2 for sequential switching and closing of the test points, a block 3 for measuring resistance with measuring elements 4 and 5 having different thresholds, a logic block 6 connected to the outputs of the measuring elements 4 and 5, a synchronization unit 7 connected to blocks 2 and 3, a RAM block 8 and a switch 9, and the outputs of block 2 are connected to the address inputs 10 of the RAM block 8, the reproducing output of which 11 is connected to the switch. Lemma 9, the recording input 12 is connected to the output of the measuring element 4 having a lower threshold, the inputs of the measuring elements 4 and 5 are connected to the switching output 13 of block 2.

Блок 2 последовательного переключения и замыкания испытуемых точек выполнен в виде приводного узла 14 для механического шагового перемещения проверяемой платы 1, соприкасающихся с нею прижимных контактов 15, расположенных в одной плоскости перпендикулярно направлению перемещения проверяемой платы (см.фиг. 2), соприкасающегося с нею сплошного контактного поля 16, последовательного переключателя 17 с замыкателем на общий зажим, .соединенного с прижимными контактами 15 и переключающим выходом 13 блока 2, и делителя 18 частоты. При этом к адресным входам 10 блока 8 оперативной памяти подключены выходы 19 и 20 последовательного переключателя 17 и приводного узла 14, а к блоку синхронизации 7 подключены последовательный переключатель 17 и через делитель 18 частоты приводной узел 14.Block 2 sequential switching and closing of the test points is made in the form of a drive unit 14 for mechanical stepwise movement of the tested board 1, contacting with it clamping contacts 15, located in the same plane perpendicular to the direction of movement of the tested board (see figure 2), in contact with it solid a contact field 16, a serial switch 17 with a contact to a common terminal, connected to the pressure contacts 15 and the switching output 13 of block 2, and a frequency divider 18. At the same time, the outputs 19 and 20 of the serial switch 17 and the drive unit 14 are connected to the address inputs 10 of the RAM 8, and the serial switch 17 and the drive unit 14 are connected to the synchronization unit 7.

Сплошное контактное поле 16 на фиг. 1 выполнено в виде встречно расположенных проволочных щеток 21 и 22 с приводным, узлом 23 для их взаимного поджатия, соединенным с делителем 18 частоты.The continuous contact field 16 in FIG. 1 is made in the form of oncoming wire brushes 21 and 22 with a drive unit 23 for their mutual preload connected to a frequency divider 18.

Сплошное контактное поле 16 на фиг. 2 выполнено в виде токопроводящей жидкости 24, размещенной в сосуде 25 с токопроводящими стенками, соединенным с общим зажимом устройства и образующими узкую щель для прохождения проверяемой платы 1. Для сохранения постоянного промежутка между прижимными контактами 15 и поверхностью токопроводящей жидкости 24 дополнительно предусмотрены сливная трубка 26, буферная камера 27, а для последующего возврата избыточной жидкости в сосуд 25 предусмотрены насос 28 с клапаном 29 и приводом 30.The continuous contact field 16 in FIG. 2 is made in the form of a conductive fluid 24 located in a vessel 25 with conductive walls connected to a common clamp of the device and forming a narrow slot for passing the test board 1. To maintain a constant gap between the pressure contacts 15 and the surface of the conductive fluid 24, a drain pipe 26 is additionally provided, a buffer chamber 27, and for the subsequent return of excess fluid to the vessel 25, a pump 28 with a valve 29 and an actuator 30 is provided.

Для зашиты проверяемой платы 1 при ее перемещении соприкасающиеся с нею прижимные контакты 15 выполнены с переменным поджатием. В варианте, показанном на фиг, 1, это достигается тем, что щетки 21 и 22 со своими перегородками 31 и контактами 15 для каждой половины контактного поля 16 выполнены скрепленными воедино и их поджатие происходит совместно с взаимным поджатием щеток 21 и 22 приводным узлом 23. В варианте показанном на фиг. 2, предполагается использование отдельного приводного узла для поджатия контактов 15 (на чертеже не показан).To protect the tested board 1 when moving it, the contacting contacts 15 in contact with it are made with alternating compression. In the embodiment shown in FIG. 1, this is achieved by the fact that the brushes 21 and 22 with their partitions 31 and contacts 15 for each half of the contact field 16 are made fastened together and they are pre-pressed together with the mutual pressing of the brushes 21 and 22 by the drive unit 23. In the embodiment shown in FIG. 2, it is intended to use a separate drive unit for preloading contacts 15 (not shown in the drawing).

Устройство работает следующим образом .The device operates as follows.

Проверяемая плата 1 устанавливается в крайнее верхнее положение, прижимные контакты 15 приводным узлом 23 прижимаются к испытуемым точкам платы 1, расположенным по линии расположения контактов 15, последовательным переключателем 17 данные точки поочередно через переключатель 9 подключаются к блоку 3 измерения сопротивлений, а все предшествующие им точки замыкаются на общий зажим источника питания устройства. По окончании проверки одной линии проверяемая плата 1 приводным узлом 14 перемещается вниз и останавливается в новом положении. При этом испытанные ранее точки платы 1 соприкасаются со Сплошным контактным полем 16 и через него замыкаются на общий зажим, а прижимные контакты 15 соприкасаются с другими испытуемыми точками платыThe tested board 1 is set to its highest position, the pressure contacts 15 of the drive unit 23 are pressed against the test points of the board 1 located along the location line of the contacts 15, the serial switch 17, these points are connected alternately through the switch 9 to the resistance measurement unit 3, and all the points preceding them close to the common terminal of the device’s power source. At the end of the test of one line, the tested board 1 drive unit 14 moves down and stops in a new position. In this case, the previously tested points of the board 1 are in contact with the Continuous contact field 16 and through it are closed to a common clip, and the pressure contacts 15 are in contact with other tested points of the board

1. Дальнейшая работа'происходит аналогичным образом. Таким образом, в результате последовательного шагового перемещения проверяемой платы все ее испытуемые точки через переключатель 9 поочередно подключаются к блоку 3 измерения сопротивлений, а предшествующие им точки замыкаются на общий зажим.1. Further work takes place in a similar way. Thus, as a result of sequential stepwise movement of the tested board, all of its test points through the switch 9 are alternately connected to the resistance measurement unit 3, and the points preceding them are closed to a common terminal.

При проверке заведомо исправной платы, принятой за эталон, на адресные входы 10 блока 8 оперативной памяти поступает информация о положении последовательного переключателя 17 и приводного узла 14. При проверке испытуемой платы, исправность которой требуется определить, должна обеспечиваться идентичность ее адресов относительно записанных ранее по эталонной плате. Достигается это точностью начальных установок платы 1 и точностью ее шагов перемещения путем применения известных зажимных и перемещающих устройств соответствующей точности (порядка десятой доли миллиметра) .When checking a known-good board accepted as a standard, the address inputs 10 of the RAM block 8 receive information about the position of the serial switch 17 and the drive unit 14. When checking a test board, the health of which is required to be determined, the identity of its addresses relative to those recorded earlier on the reference circuit board. This is achieved by the accuracy of the initial settings of the board 1 and the accuracy of its movement steps by using the known clamping and moving devices of the corresponding accuracy (of the order of a tenth of a millimeter).

Перед началом перемещения платы 1 щетки 22 и 23 раздвигаются и поджатие контактов 15 снимается приводным узлом 23, управляемым синхронизирующими импульсами, поступающими с делителя 18 частоты. Приводной узел 14 управляется с того же делителя 18 частоты соответственно задержанными импульсами. Коэффициент деления делителя 18 частоты равен числу прижимных контактов 15 в линиях по обе стороны проверяемой платы 1.Before moving the board 1, the brushes 22 and 23 move apart and the preload of the contacts 15 is removed by the drive unit 23, controlled by synchronizing pulses from the frequency divider 18. The drive unit 14 is controlled from the same frequency divider 18, respectively, by delayed pulses. The division ratio of the frequency divider 18 is equal to the number of pressure contacts 15 in the lines on both sides of the tested board 1.

При использовании сплошного контактного поля 16 в варианте, показанном на фиг. 2, работа происходит аналогичным образом. Проверенная прижимными контактами 15 и последовательным переключателем 17 линия испытуемых точек платы 1 при ее перемещении погружается в токопроводящую жидкость 24 и через нее и токопроводящие стенки сосуда 25 замыкается на общий зажим. При погружении платы 1 излишняя жидкость через сливную трубку 26 стекает в буферную камеру 27, тем самым сохраняется на одном уровне поверхность токопроводящей жидкости 24. После окончания проверки плата 1 из сосуда 25 извлекается и насосом 28, работающим от привода 30, клапан 29 перекрывается и жидкость возвращается из буферной камеры 27 в сосуд 25. При этом перегородки 31 предохраняют контакты 15 от попадания на них токопроводящей жидкости 24 при перемещении платы 1. Аналогичным образом перегородки 31 в варианте, представленном на фиг. 1, предохраняют от замыканий контакты 15 с токопроводящими щетинками щеток 21 и 22. Это позволяет значительно уменьшить шаг перемещения платы 1.When using the continuous contact field 16 in the embodiment shown in FIG. 2, work is done in a similar way. Checked by the clamping contacts 15 and the serial switch 17, the line of the test points of the board 1 when it moves is immersed in the conductive fluid 24 and through it and the conductive walls of the vessel 25 is closed to a common clip. When the circuit board 1 is immersed, excess liquid flows through the drain tube 26 into the buffer chamber 27, thereby maintaining the surface of the conductive liquid 24. The circuit 1 is removed from the vessel 25 after the test is completed and the pump 28 running from the actuator 30 closes the valve 29 and the liquid returns from the buffer chamber 27 to the vessel 25. In this case, the partitions 31 protect the contacts 15 from the ingress of conductive liquid 24 upon moving the board 1. Similarly, the partitions 31 in the embodiment of FIG. 1, the contacts 15 with the conductive bristles of the brushes 21 and 22 are protected from short circuits. This can significantly reduce the step of moving the board 1.

В остальном устройство работает аналогично прототипу.The rest of the device works similarly to the prototype.

Устройство по существу исключает необходимость применения специальных контактирующих устройств для одновременного контактирования со всеми испытуемыми точками проверяемых плат, причем оно в принципе универсально:The device essentially eliminates the need for special contacting devices for simultaneous contact with all test points of the boards under test, and it is, in principle, universal:

ограничение имеет место только по предельным размерам проверяемых плат, которые естественно не могут превышать предельные размеры линий контактов 15 и размеров сплошного контактного поля 16.the restriction takes place only on the limiting dimensions of the tested boards, which naturally cannot exceed the limiting dimensions of the contact lines 15 and the dimensions of the continuous contact field 16.

⁵ Применение устройства позволяет использовать последовательный переключающий блок с замыкателем на несколько десятков (в крайнем случае, на две-три сотни) положений, что упрощает и удешевляет устройство. ⁵ The use of the device allows the use of a sequential switching unit with a contactor for several tens (in extreme cases, two to three hundred) positions, which simplifies and cheapens the device.

Claims

The invention relates to the field of electrical measuring equipment and can be used for the automated control of printed circuit boards. A contact device is known in which the contacts are insulated from each other and have separate discharge conductors 1. A disadvantage of the known device is the complexity of the design. A device for controlling electrical installation in the main ed. No. 648919, containing a sequential switching unit and testing of test points, a resistance measuring unit consisting of two measuring elements with different response thresholds, a logic unit connected to the outputs of the measuring elements, a synchronization unit connected to the sequential switching and shorting unit of their test points and to the unit of measurement of resistance, the block of RAM and the switch, while the outputs of the block of sequential switching and closure of the subjects are connected to the addr The common inputs of the RAM block, which reproduces the output of which is connected to the switch, records the input to the output of the measuring element, which has a lower threshold, and the inputs of the measuring elements are connected to the switching output of the sequential switching unit and closure of the test points through switch 2. A disadvantage of the known device is the complexity of the design. The purpose of the invention is to simplify the device for controlling printed circuit boards. This is achieved by the fact that in the device for controlling electrical installation, the sequential switching and closing unit of the test points is designed as a drive unit in contact with the board of pressure contacts being tested, which are located in one plane perpendicular to the direction of movement of the tested card in contact with it. a contact field, which is connected to the common pole of the power source, of a series switch, which is connected to the pressure contacts and the switching output b Lok, and frequency divider, while the outputs of the sequential switch and the POSITIONAL node are connected to the address inputs of the operative memory block, and the synchronous block is connected to the serial switch and frequency separator of the drive node, as well as by the continuous contact field arranged wire brushes with a drive unit for I; - mutual preload, which is connected to a frequency divider and that a solid contact field is made in the form of a conductive liquid, and pressure contacts are They are equipped with a drive unit for their command clamping to the tested board. And the pressure contacts and the solid contact field are separated by partitions. FIG. 1 shows a structural electrical circuit of the device using wire brushes as a solid contact field; in fig. Figure 2 shows the structural electrical circuit of the device using a solid contact field in the form of a conductive liquid. The device (see Fig. 1) contains a test board 1, a block 2 of sequential switching and loop testing of 1 points, a block 3 measuring resistances with measuring elements 4 and 5, which have different response horns, logic block 6 connected to the outputs of measuring elements 4 and 5, a synchronization unit 7 connected to blocks 2 and 3, a RAM block 8 and a switch 9, the outputs of block 2 connected to the address inputs 10 of the RAM block 8, which reproduces the output 11 of which is connected to the switch. Lem 9, recording input 12 is connected to the output of the measuring element 4 having a lower response threshold, the inputs of measuring elements 4 and 5 are connected to the switching output 13 of unit 2. The unit 2 of sequential switching and shorting of test points is made in the form of a drive unit 14 for mechanical step motion the test board 1, which is in contact with it, the pressure contacts 15, which are located in one plane perpendicular to the direction of movement of the test board (see fig. 2), in contact with its solid contact floor 16, the serial intersection breakers contactor 17 with a common terminal, with compounds of the pressing strokes to output 15 and a switching unit 2, and a frequency divider 18. At the same time, the outputs 19 to 20 of the sequential switching of the bodies 17 and the drive unit 14 are connected to the address inputs 10 of the operating memory unit 8, and the synchronization unit 7 is connected via the research switch 17 and the drive unit 14 through the frequency divider 18. The solid contact field 16 is ig. 1 is made in the form of counter-spaced wire brushes 21 and 22 driven, by a unit 23 for their mutual pressing, connected to a frequency divider 18. The solid contact field 16 in FIG. 2 is made in the form of a conductive liquid 24 placed in a vessel 25 with a conductor:.: These walls are connected to the common clamp of the device and form a narrow slit for passing the tested board 1. To maintain a constant gap between The pressure contacts 15 and the hoses of the liquid 24 are additionally provided with a drain tube 26 / buffer chamber 27, and a pump 28 with a valve 29 and an actuator 30 is provided for the subsequent return of the excess fluid to the vessel 25. The armor 1, when it is moved, the contacting contacts 15 in contact with it are made with variable preload. In the embodiment shown in FIG. 1, this is achieved in that the brushes 21 and 22 with their partitions 31 and contacts 15 for each half of the contact field 16 are bonded together and they are pressed together with the mutual pressing of the brushes 21 and 22 by the drive unit 23. In the embodiment shown in FIG. 2, it is intended to use a separate drive unit to press the contacts 15 (not shown in the drawing). The device works as follows. The checked board 1 is set to the uppermost position, the pressure contacts 15 are pressed by the drive unit 23 to the test points of the board 1, located along the line of the contacts 15, the sequential switch 17 connects these points alternately through the switch 9 to the resistance measurement unit 3, and all previous ones the points are closed on the common terminal of the device power source. Upon completion of testing one line, the checked card 1, drive 1: m, node 14 moves down and stops in a new position. In this case, the previously tested points of the board 1 are in contact with the continuous contact field 16 and through it are pinned to the common clamp, and the pressure contacts 15 are in contact with the other test points of the board 1. Further work proceeds in the same way. Thus, as a result of the sequential step-by-step movement of the board under test, all of its test points are alternately connected to the resistance measurement unit 3 via switch 9, and the points preceding them are connected to a common terminal. When checking a known serviceable board, taken as a standard, the position inputs 10 of the RAM 8 receive information about the position of the sequential switch 17 and the drive unit 14. When testing a test card, the health of which needs to be determined, it must ensure that its addresses are identical to those previously written on the reference board. This is achieved by the accuracy of the initial settings of the board 1 and the accuracy of its movement steps by applying known clamping and moving devices of appropriate accuracy (in the order of a tenth of a millimeter). Before the beginning of the movement of the board 1, the brushes 22 and 23 are moved apart and the preload of the contacts 15 is removed by the drive unit 23 controlled by the synchronizing pulses coming from sharing the frequency bodies 18. The drive unit 14 is controlled by the same frequency divider 18, respectively, with delayed pulses. The division factor of the frequency divider 18 is equal to the number of pressure contacts 15 in the lines on both sides of the tested card 1. When using a solid contact field 16 in the variant shown in FIG. -2, the work is done in a similar way. The tested clamping contacts 15 and the sequential switch 17 of the line of the test points of the board 1, when it is moved, is immersed in the conductive liquid 24 and through it and the conductive walls of the vessel 25 is closed to a common terminal. When the board 1 is immersed, the excess liquid through the drain pipe 26 flows into the buffer chamber 27, thereby keeping the surface of the conductive fluid 24 at the same level. After the test is completed, the board 1 is removed from the vessel 25 and the pump 28, driven by the actuator 30, is closed and the liquid returns from the buffer chamber 27 to the vessel 25. At the same time, the partitions 31 prevent the contacts 15 from falling on them from the conductive liquid 24 when the board 1 is moved. Similarly, the partitions 31 in the embodiment shown in FIG. 1, the contacts 15 with the current-conductive bristles of the brushes 21 and 22 are prevented from hiccups. This makes it possible to significantly reduce the step of moving the board 1. Otherwise, the device works similarly to the prototype. The device essentially eliminates the need to use special contacting devices for simultaneous contact with all the tested points of the tested boards, and it is in principle universal: the restriction only applies to the size limits of the tested boards, which naturally cannot exceed the limit sizes of the contact lines 15 and the dimensions of the continuous contact field 16. The use of the device allows the use of a serial switching unit with a contactor for several tens (at the extreme case, two or three hundred) provisions, which simplifies and cheapens the device. Claim 1. Device for controlling electrical installation of printed circuit boards according to author. W 648919, characterized in that, in order to simplify the device, the sequential switching and closing unit of the test points is designed as a drive unit in contact with the board of pressure contacts being checked, which are located in one plane perpendicular to the direction of movement of the board under test, which is in contact with thereto is a solid contact field, which is connected to the common pole of the power source, a series switch, which is connected to the pressure contacts and the switching output of the unit, and a divider simplicity, the address inputs to the RAM memory unit are connected sequentially switches and outputs the drive unit, and synchronization unit connected to the serial switch and a frequency divider via a drive assembly. 2. The device according to claim 1, characterized in that the solid contact field is made in the form of counter-spaced wire brushes with a drive unit for their mutual pressing, which is connected to a frequency divider. 3. The device according to claim 1, about tl and that the continuous contact field is made in the form of a conductive liquid. 4. The device according to claim 1, characterized in that the clamping contacts are made with the drive unit l command them to the board to be tested. 5. The device according to claim 1, distinguished by the fact that the pressure contacts and the solid contact field are separated by partitions. Sources of information taken into account in the examination 1. USSR author's certificate number 524540, cl. G 01 R 31/02, 1970.

2. USSR author's certificate number 648919, cl. G 01 R 31/02, 1976 (prototype).

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