CN215728381U

CN215728381U - Universal direct current resistance test system

Info

Publication number: CN215728381U
Application number: CN202121359871.4U
Authority: CN
Inventors: 王垚; 段晓东; 李奕恒; 尹德帆; 李佳琳; 郭凯; 张翠芳
Original assignee: Beijing Aerospace Guanghua Electronic Technology Co Ltd
Current assignee: Beijing Aerospace Guanghua Electronic Technology Co Ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2022-02-01
Anticipated expiration: 2031-06-18

Abstract

The utility model relates to a universal direct current resistance testing system, which comprises an industrial personal computer module, a CPCI cage, a power supply module and a universal meter module, wherein the CPCI cage internally comprises a network switching module, a channel gating module and a testing switching module; the industrial personal computer module is a central control unit of the test system and is respectively connected with the universal meter module, the network switching module, the channel gating module and the test switching module; the universal meter module is connected with the industrial personal computer module through a PCI interface; the network switching module is used for completing signal connection with the industrial personal computer, is connected with the channel gating module and the test switching module, and transmits instruction conversion to the channel gating module and the test switching module after receiving an upper computer command so as to enable the channel gating module and the test switching module to work cooperatively to select a test point position. The utility model has large test coverage and can test the resistance between 300 point positions on the tested product at most.

Description

Universal direct current resistance test system

Technical Field

The utility model relates to a universal direct current resistance testing system, which is applied to the installation and debugging test occasions after the electric fitting of related products is completed, and belongs to the technical field of testing.

Background

With the continuous development of the technology in the aerospace field in China, the production tasks of related model products are multiplied, a plurality of related model products are produced to be tested, in order to ensure the production efficiency of the model products, after the production and assembly links are completed, the special equipment which is efficient, reliable, high in intelligent degree and strong in universality is needed, and the special equipment for automatically testing the resistance between the product connectors is particularly necessary.

The existing resistance testing system generally consists of three discrete parts (a desktop computer, a desktop multimeter and a point position switching module), and has the advantages of low integration level, large volume and high cost. The product is required to be close to the resistance tester during testing, or the three independent parts are respectively moved to positions close to the product, the product is not protected during testing, and protection circuits such as an anti-peak circuit and a voltage release circuit are not provided, so that great potential quality hazards are brought. In addition, the existing test system has low test efficiency and low intelligence level, and can not meet the increasingly developed production test requirements.

SUMMERY OF THE UTILITY MODEL

The technical problem solved by the utility model is as follows: the defects in the prior art are overcome, the universal direct current resistance testing system is provided, and the integrated resistance testing system is formed through modularization and integration design.

The technical scheme of the utility model is as follows:

a universal direct current resistance test system comprises an industrial personal computer module, a CPCI cage, a power supply module and a universal meter module,

the CPCI cage comprises a network switching module, a channel gating module and a test switching module inside, and all sub-modules are assembled in a chassis to form a whole machine system;

the industrial personal computer module is a central control unit of the test system and is respectively connected with the universal meter module, the network switching module, the channel gating module and the test switching module;

the universal meter module is connected with the industrial personal computer module through a PCI interface;

the network switching module is used for completing signal connection with an industrial personal computer, is connected with the channel gating module and the test switching module, and transmits instruction conversion to the channel gating module and the test switching module after receiving an upper computer command so as to enable the channel gating module and the test switching module to work cooperatively to select a test point position;

the channel gating module is matched with the test switching module to realize the switching between two test meter pens of the universal meter and each point position of the connector on the product so as to complete the switching action of the resistance test point positions;

the test switching module comprises a test meter pen positive and negative switching circuit, a voltage bleeder circuit and a peak clipping and inverting circuit, wherein the voltage bleeder circuit is connected in parallel to the test loop by a resistor and a diode.

Further, the multimeter module can perform AC/DC voltage, AC/DC current, and 2-wire or 4-wire resistance measurements as well as diode testing.

Further, the resistance measurement auto-ranging time of the multimeter module is no greater than 250 ms.

Further, the trigger delay of the multimeter module is <1 μ s.

Further, the maximum trigger frequency of the multimeter module is 2.5 kHz.

Furthermore, 4 relays are used for switching and testing 4 tested points.

Further, when the test loop is a capacitive load, the voltage can be quickly discharged through the resistor.

Furthermore, when the test loop is an inductive load, the test loop and the diode form a path to discharge the current in the inductive load.

Furthermore, the peak clipping and inverting circuit adopts a diode to be connected with an inductance coil in parallel to eliminate the peak inverting voltage.

Further, the network switching module converts the TCP/IP protocol into PC104 protocol level output.

Compared with the prior art, the utility model has the beneficial effects that:

(1) the utility model has large test coverage, and can test the resistance between 300 points on the tested product;

(2) the utility model has the protection circuits such as the anti-peak circuit, the voltage bleeder circuit and the like, so as to ensure that the damage to the tested product is reduced to the minimum in the test process;

(3) the utility model has high integration degree, all functional modules are concentrated in one case, and a CPCI cage in the case is a core part and mainly completes the switching of test point positions and the circuit protection function.

Drawings

FIG. 1 is a block diagram of the system components of the present invention;

FIG. 2 is a functional block diagram of measurement and control software according to the present invention.

Detailed Description

The utility model is further illustrated by the following examples.

As shown in fig. 1, the universal direct current resistance testing system of the present invention uses PC104 and RS232 as communication buses, divides a tester into various functional modules, and mainly comprises an industrial personal computer, a PCI-4065 universal meter module, and a CPCI cage (including functional modules and a backplane). The cage with the functional module and the bottom plate mainly completes the switching of test point positions and the circuit protection function.

The industrial personal computer module is a central control unit of the test system, is respectively connected with the PCI-4065 universal meter module, the network switching module, the gating module and the test switching module, coordinates the work of each module through an upper computer interface, and tests and records the resistance between the connectors of the tested products. In the embodiment, the computer module adopts an ARK-3500P-00A 1E type embedded industrial personal computer of the Hua science and technology, has compact structure, light weight and rich resources, and is very convenient for system integration.

The PCI-4065 universal meter module is connected with the computer module through a PCI interface, a PCI-4065 digital universal meter adopting NI has the reading range of 61/2 bits and the reading range of +/-1999999, and the universal meter equipment can be used for measuring alternating current/direct current voltage, alternating current/direct current and 2-wire or 4-wire resistance and testing a diode. The specific parameters are as follows:

(1) resistance measurement automatic range time: 250 ms;

(2) trigger delay <1 μ s;

(3) the maximum trigger frequency is 2.5 kHz;

(4) resistance test precision reference table 2-1 multimeter resistance test parameter table.

The network switching module mainly completes signal connection with an industrial personal computer and converts a TCP/IP protocol into a PC104 protocol level output function. In the embodiment, the network switching module is mainly connected with the channel gating module and the test switching module, and after receiving the command of the upper computer, the network switching module converts the command and transmits the command to the channel gating module and the test switching module so as to enable the channel gating module and the test switching module to work cooperatively, thereby achieving the purpose of selecting the test point location.

The channel gating module is mainly matched with the test switching module, and can realize switching between two test meter pens of the universal meter and each point position of the connector on the product so as to complete the switching action of the resistance test point positions. The design principle is that switching and testing among multiple points of positions are realized by using as few relays as possible. Aiming at the principle, the scheme of designing the relay array is to realize the switching and testing among 4 tested points by 4 relays. At present, the relay array scheme is an optimal scheme under the principle of 'using a small amount of relays to realize switching and testing among multiple points of bits'.

The test switching module mainly comprises a test meter pen positive and negative switching circuit, a voltage bleeder circuit and a peak clipping and inverting circuit so as to ensure that the damage to a tested product is reduced to the minimum in the test process. The voltage leakage circuit is formed by connecting a resistor and a diode SS18 in parallel to a test circuit, when the test circuit is a capacitive load, voltage can be quickly leaked through the resistor R16, and when the test circuit is an inductive load, the test circuit and the diode form a path to discharge current in the inductive load. The peak clipping circuit adopts a diode and an inductance coil which are connected in parallel to eliminate the peak clipping voltage.

The functions of the host computer interface of the present invention will be described with reference to fig. 2:

the upper computer (industrial personal computer) has the functions of data acquisition, data processing, communication, information display, information storage and the like. The data acquisition mainly completes the control of the tester to execute resistance data acquisition on specified test points according to the logic requirements of test tasks; the data processing finishes the judgment of the acquired data and makes a judgment on the test result; according to the communication requirement, completing data analysis of the tester and the tested module; the information display completes the display of the valid data; and the data storage completes the function of storing the test result and the test data by the tester. The specific functions are as follows:

1) user and rights management function: different users log in and have different use authorities, the administrator has the authority to establish, modify and open the test program, the operator only has the authority to open the program;

2) test information setting function: test point naming data, test parameters and data tables of various test types can be set;

3) test item selection function: corresponding test functions can be selected according to needs, and the power distributor module test, the safety control module test, the elasticity test module test, the time sequence control module test, the comprehensive control module test, the power supply module test and the switch amplification module test are realized;

4) the data viewing function: the parameter setting information of each test program and each test type data table can be checked;

5) an information display function: the method comprises the steps of testing information such as product numbers, testing stages, testing personnel, testing results, error information and testing duration, and state information such as storage states and program testing progress;

6) and a result counting function: and counting the number of unqualified tests of different test items and the number of total test unqualified items.

Further, in the embodiment, a specific channel for measurement is selected by the upper computer, the upper computer sends a channel gating command to the network switching board through the internet access, the network switching board sends the command to the channel gating module, the module completes channel switching, the upper computer sends a resistance test command, the network switching board sends the command to the test switching module, the module completes the action of accessing the multimeter pen to the corresponding channel, the measured value of the multimeter is returned to the upper computer through the PCI interface, and the upper computer performs reading; after reading, the test switching module firstly connects the voltage bleeder circuit and the inverse peak cutting circuit into the test loop, then separates the multimeter test pen from the corresponding channel, and then disconnects the corresponding channel through the channel gating module, thus completing a resistance test.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.

Claims

1. A universal direct current resistance test system is characterized by comprising an industrial personal computer module, a CPCI cage, a power supply module and a universal meter module,

the network switching module is used for completing signal connection with an industrial personal computer, is connected with the channel gating module and the test switching module, and transmits instruction conversion to the channel gating module and the test switching module after receiving an upper computer command so as to select a test point position;

2. A universal dc resistance test system according to claim 1, wherein the multimeter module is capable of ac/dc voltage, ac/dc current and 2 or 4 wire resistance measurements and diode testing.

3. A universal dc resistance test system according to claim 1, wherein the multimeter module has a resistance measurement auto-ranging time of no more than 250 ms.

4. A universal dc resistance test system according to claim 1, characterized in that the trigger delay of the multimeter module is <1 μ β.

5. A universal direct current resistance test system according to claim 1, wherein the maximum trigger frequency of the multimeter module is 2.5 kHz.

6. The universal direct current resistance test system according to claim 1, wherein 4 relays are used for switching and testing among 4 tested points.

7. A universal dc resistance test system according to claim 1, wherein when the test loop is a capacitive load, the voltage is quickly bled through the resistor.

8. A universal dc resistance test system according to claim 1, wherein when the test loop is an inductive load, the test loop and the diode form a path for discharging current from the inductive load.

9. A universal dc resistance test system according to claim 1, wherein the peak clipping circuit employs a diode in parallel with the inductor to remove the peak-to-peak voltage.

10. The universal dc resistance test system according to claim 1, wherein the network switch module converts TCP/IP protocol to PC104 protocol level output.