CN211123143U - Control box CPU veneer test bench - Google Patents

Abstract

The utility model discloses a control box CPU single board test bench, which comprises a cabinet, a test cable, a test unit and a power supply, wherein the front side of the cabinet is provided with a panel which is electrically connected with the test unit, one end of the test cable is inserted on the panel, the other end of the test cable is provided with a joint which is connected with the control box CPU board, and the power supply is arranged in the cabinet and is electrically connected with the test unit; the test unit comprises an optical code input circuit and an advance input circuit. Has the advantages that: through the interface design of convenient operation, the technical performance of the CPU board of the control box can be efficiently and accurately detected, the test flow is simplified, the detection precision is improved, the detection working hours are reduced, the convenience of detection operation is improved, and the professional requirements on detection personnel are reduced to a certain extent; the detection precision is high, and the test requirement of the product can be met; the manufacturing cost is low, and the production is convenient; an extended function is reserved, and testing of similar products can be achieved by replacing the switching cable.

Description

Control box CPU veneer test bench

Technical Field

The utility model relates to a for military use is equipped special detection technology field, concretely relates to control box CPU veneer test bench.

Background

In the prior art, detection and repair of a CPU board sensor of a control box depend on universal detection equipment such as an oscilloscope, a universal meter and the like, measurement needs to be carried out from the inside of a part to be detected, the detection procedure is complex and tedious, detection needs to be completed by professionals with abundant maintenance experience, and the detection is time-consuming, labor-consuming, large in detection error and low in precision.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a control box CPU veneer test bench just in order to solve above-mentioned problem, the utility model provides an among a great deal of technical scheme preferred technical scheme have: the technical performance of the CPU board of the control box can be efficiently and accurately detected, the test flow is simplified, the measurement precision is improved, and the like, and the technical effects are described in detail below.

In order to achieve the above purpose, the utility model provides a following technical scheme:

The utility model provides a control box CPU single board test bench, including rack, test cable, test unit and power, the rack is openly installed and is connected the panel of test unit electrically, test cable one end is pegged graft on the panel, and the other end is provided with the joint of connecting control box CPU board, the power set up in the rack and with the test unit electricity is connected;

The test unit comprises an optical code input circuit, an advance input circuit, an electric zero correction and working condition selection assembly and a display unit.

Preferably, a full-wave rectifying circuit consisting of diodes, a voltage stabilizing module and a filter circuit are arranged in the power supply;

the voltage stabilizing module selects L M317, L M7805, L M7812 and L M7912 to convert alternating current 220V voltage into +26V, +5V and +/-12V direct current respectively, and is connected with the test unit through a relay.

Preferably, the optical code input circuit comprises a pulse generating circuit, an optical code counting circuit, a gray code conversion circuit, an overflow limiting circuit and a display control and drive circuit.

Preferably, the nixie tube display assembly further comprises a display lamp interface circuit.

Preferably, the nixie tube display assembly is composed of four pieces of common cathode nixie tubes, and the display lamp interface circuit is composed of 3 pieces of 54HC373 data latches and 24 light emitting diodes.

Preferably, the back of the cabinet is provided with a socket connected with the power supply.

To sum up, the utility model has the advantages that: 1. through the interface design of convenient operation, the technical performance of the CPU board of the control box can be efficiently and accurately detected, the test flow is simplified, the detection precision is improved, the detection working hours are reduced, the convenience of detection operation is improved, and the professional requirements on detection personnel are reduced to a certain extent;

2. The detection precision is high, and the test requirement of the product can be met;

3. The manufacturing cost is low, and the production is convenient;

4. An extended function is reserved, and testing of similar products can be achieved by replacing the switching cable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic front view of the present invention;

Fig. 2 is a schematic view of the internal structure of the present invention;

Fig. 3 is a detection block diagram of the present invention.

The reference numerals are explained below:

1. A cabinet; 2. testing the cable; 3. a test unit; 4. a power source.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-3, the utility model provides a control box CPU single board test bench, including rack 1, test cable 2, test unit 3 and power 4, the back of rack 1 is provided with the backplate, is provided with the socket of connecting power 4 on the backplate, and the backplate can be dismantled with rack 1 and cooperate, and rack 1 openly installs the panel of electricity connection test unit 3, and test cable 2 one end pegs graft on the panel, and the other end is provided with the joint of connecting control box CPU board, and power 4 sets up in rack 1 inside and with test unit 3 electricity connection; the test cable 2 is used for realizing the electrical connection between equipment and a test part, and a test interface of the test bed is a universal D-shaped socket, a part of test ports are reserved, and the test cable can be used for system function expansion;

The test unit comprises an optical code input circuit, an advance input circuit, an electric zero correction and working condition selection assembly and a display unit, wherein the optical code input circuit mainly realizes the functions of simulating an actual optical code, controlling an optical code input value and providing control and driving for the digital display assembly; the lead input circuit is used for mainly simulating high and low aiming angles and azimuth leads, controlling input values of the high and low aiming angles and the azimuth leads and providing control and driving functions for the digital display assembly, and is similar to the optical code input circuit, except that the leads are ten-bit binary codes, and are not repeated; the electric zero correction and working condition selection component is used for simulating and controlling an electric zero correction value and a working condition selection value; the display unit includes: the digital display voltmeter is used for testing the precision of the proportional-integral signal; the nixie tube display component is used for displaying the optical code and the decimal advanced value; the optical code advance indicating window is used for indicating an input code;

The interface output value of the tested board is detected by taking hardware analog optical code, advance, electric zero correction, working condition selection, frame collision signal, shooting door blocking signal and the like as CPU board input quantity, the performance index of the tested board is detected item by item according to technical conditions by display lamp indication window, digital display and digital display meter measurement.

the voltage stabilizing module selects L M317, L M7805, L M7812 and L M7912 to respectively convert alternating current 220V voltage into +26V, +5V and +/-12V direct current, and is connected with the testing unit 3 through a relay so as to supply power to the testing unit 3 and a tested CPU board, and the power supply 4 is arranged at a position close to the rear side in the cabinet 1 so as to be convenient to disassemble and maintain in case of failure;

The optical code input circuit comprises a pulse generating circuit, an optical code counting circuit, a Gray code conversion circuit, an overflow limiting circuit and a display control and drive circuit; the pulse generating circuit consists of a NOT gate CD4069, a NAND gate CD4011, a resistor and a capacitor and provides pulses for subsequent circuits. Generating a pulse signal with a certain width by pressing a corresponding button switch on the panel once; the optical code counting circuit is divided into a horizontal optical code counting circuit and a high-low optical code counting circuit, wherein the horizontal optical code counting circuit is composed of three CDs 40193 and a peripheral circuit, the CDs 40193 are preset four-bit binary plus-minus counters which are connected in series, and pulse signals generated by keys are converted into ten-bit binary numbers through the CDs 40193; the actually input optical code is a binary gray code generated by a gray code disc; the binary to gray code conversion relationship is as follows:

Binary number: bn-1 Bn-2 … … B2B1B0

Gray code: gn-1Gn-2 … … G2G1G0

Wherein the high order is retained-Gn-1 ═ Bn-1

each of the other bits Gi ═ Bi +1 ⊕ Bii ═ 0, 1, 2, …, n-2;

A limit overflow circuit: consists of two six-inverter CD4069, 20 diodes 1N4148 and one CD 4011. The function of this circuit is to prevent the counter CD4069 from overflowing erroneously. When the tens digits output by the counter are all high level 1, namely the maximum value is reached, after the ten digits are processed by the logic circuit, the CPU pin of the CD40193 is low level 0, and at the moment, the counter does not perform addition counting any more. When the tens digits output by the counter are all low level 0, namely reaching the minimum value, the counter does not count down any more. Therefore, the circuit limits the counting range of the counter and prevents overflow errors;

The display control and drive circuit consists of three synchronous decimal reversible counters CD40192 and seven decoder CD4511 and peripheral circuit. The function of the circuit is to accumulate the number of plus and minus pulses in decimal form and drive a nixie tube display to display. The circuit is characterized in that: the pulse source, the zero clearing and the digit setting of the CD40192 are respectively shared with the optical code counting circuit, so that the output value of the nixie tube display and the output value of the optical code counting circuit are the same, but the nixie tube display is displayed in a decimal form, and the nixie tube display is more visual.

The nixie tube display component also comprises a display lamp interface circuit;

The nixie tube display component is composed of four pieces of common cathode nixie tubes and is used for displaying values of optical codes and lead, the display lamp interface circuit is composed of 3 pieces of 54HC373 data latches and 24 light-emitting diodes, a latch data input signal and a chip selection signal are controlled by a single chip microcomputer, each bit of an output end controls one light-emitting diode, and when the output is high level, the corresponding light-emitting diode is on.

Through the interface design of convenient operation, can be high-efficient, accurate detection control box CPU board's technical performance, simplify the test flow, improve and detect the precision, reduce and detect man-hour, improve the convenience of detection operation, reduce the professional demand to the measurement personnel to a certain extent.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (6)

1. A control box CPU single board test bed is characterized by comprising a cabinet (1), a test cable (2), a test unit (3) and a power supply (4), wherein a panel electrically connected with the test unit (3) is installed on the front surface of the cabinet (1), one end of the test cable (2) is inserted on the panel, a connector connected with a control box CPU board is arranged at the other end of the test cable, and the power supply (4) is arranged inside the cabinet (1) and electrically connected with the test unit (3);

The test unit (3) comprises an optical code input circuit, an advance input circuit, a zero position correction and working condition selection assembly, and the test unit (3) further comprises a display unit.

2. The control box CPU single board test bench of claim 1, characterized in that: a full-wave rectifying circuit, a voltage stabilizing module and a filter circuit which are composed of diodes are arranged in the power supply (4);

the voltage stabilizing module selects L M317, L M7805, L M7812 and L M7912 to convert alternating current 220V voltage into +26V, +5V and +/-12V direct current respectively, and is connected with the test unit (3) through a relay.

3. The control box CPU single board test bench of claim 1, characterized in that: the optical code input circuit comprises a pulse generating circuit, an optical code counting circuit, a Gray code conversion circuit, an overflow limiting circuit and a display control and drive circuit.

4. The control box CPU single board test bench of claim 1, characterized in that: the display unit includes: the digital display voltmeter, charactron display module and light code lead indicating window, the charactron display module still includes display lamp interface circuit.

5. The control box CPU single board test bench of claim 4, characterized in that: the nixie tube display component consists of four pieces of common-cathode nixie tubes, and the display lamp interface circuit consists of 3 pieces of 54HC373 data latches and 24 light-emitting diodes.

6. The control box CPU single board test bench of claim 1, characterized in that: and a socket connected with the power supply (4) is arranged on the back surface of the cabinet (1).

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