CN110780187A - Small-size DMM test board card and PCBA test system - Google Patents
Small-size DMM test board card and PCBA test system Download PDFInfo
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- CN110780187A CN110780187A CN201911288839.9A CN201911288839A CN110780187A CN 110780187 A CN110780187 A CN 110780187A CN 201911288839 A CN201911288839 A CN 201911288839A CN 110780187 A CN110780187 A CN 110780187A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2818—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP] using test structures on, or modifications of, the card under test, made for the purpose of testing, e.g. additional components or connectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/12—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
- G01R15/125—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will for digital multimeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention discloses a small DMM test board and a PCBA test system, wherein the DMM test board comprises a current analog-to-digital conversion branch, a power supply module and a voltage analog-to-digital conversion branch, the PCBA test system based on the DMM board comprises a PCBA switching board, a switching connector, a total switching board, a board-to-board connector, a motherboard, a DMM board, an MCU board, an industrial personal computer, a power connector and a power supply, the PCBA switching board transmits a voltage current signal of the PCBA to be tested to the DMM board through the total switching board, the DMM board converts the voltage current signal into a digital signal and transmits the digital signal to the MCU board through the motherboard, and the MCU board is in telecommunication connection with the industrial personal computer through an RJ45 network port on the. The DMM board card and the testing system are small in size, low in cost, simple and easy to operate in the detection method and convenient to popularize and apply.
Description
Technical Field
The invention relates to the technology of electronic and electrical equipment, in particular to a small DMM test board and a PCBA test system, and belongs to a board-level voltage and current test instrument.
Background
At present, most of tests of voltage and current by an intelligent test terminal are carried out by using large-scale instruments, the tests are complete equipment instruments in the current market, the test process is complex, the instruments are expensive, the current situation that the current situation is not easy to approach the daily life of people is caused, the volume of automatic test equipment cannot be reduced, the production cost of the automatic test equipment cannot be reduced, and the low cost of customers cannot be met more and more; when the test fixture needs to test a plurality of products simultaneously, a greater number of DMMs are needed to meet the test requirement, the volume of the test fixture can be increased in multiples, the production cost can be greatly increased, and the defect is more obvious. Therefore, the voltage and current test board card which is small in size, low in cost and capable of stably meeting the measurement requirements is very urgent in demand.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a small-sized DMM test board and a PCBA test system, which can solve the above related problems.
The purpose of the invention is realized by adopting the following technical scheme:
a small-sized DMM (Digital Multimeter, DMM for short) test board card comprises a current analog-to-Digital conversion branch circuit, a power supply module and a voltage analog-to-Digital conversion branch circuit.
The current Analog-to-Digital conversion branch circuit comprises a current acquisition input end, a sampling resistor, an instrument operational amplifier, an Analog-to-Digital Converter (ADC) and a Digital isolator which are sequentially connected; the current to be measured flows through the sampling resistor through the current acquisition input end, weak voltage is formed at two ends of the sampling resistor, the weak voltage at two ends of the sampling resistor is amplified by the instrument operational amplifier and then is transmitted to the analog-to-digital converter, the analog-to-digital converter converts the amplified voltage into a digital signal, and the digital signal is transmitted to a Micro Control Unit (MCU) through the digital isolator.
The power supply module comprises a power supply input end, an isolation power supply, an amplifier power supply end, a first low dropout linear regulator, a second low dropout linear regulator and a reference voltage supply end; the power supply input end supplies power to the isolation power supply, the isolation power supply supplies power to the instrument operational amplifier through the amplifier power supply end, and supplies first low-voltage electricity, second low-voltage electricity and reference voltage to the analog-to-digital converter through the first low-voltage difference linear voltage stabilizer, the second low-voltage difference linear voltage stabilizer and the reference voltage supply end.
The voltage analog-to-digital conversion branch comprises a voltage acquisition input end, an analog-to-digital converter and a digital isolator which are sequentially connected; the voltage to be measured is directly input to the analog-to-digital converter through the voltage acquisition input end, and the analog-to-digital converter converts the input voltage into a digital signal and transmits the digital signal to the micro control unit through the digital isolator.
Preferably, the weak voltage across the sampling resistor is amplified by 10 times by the instrumentation operational amplifier.
Preferably, the digital isolator adopts a 4-channel digital isolator.
Preferably, the power supply input end supplies 12V voltage, the amplifier power supply end of the isolation power supply outputs ± 12V voltage, the first low dropout regulator of the isolation power supply outputs 3V voltage, the second low dropout regulator of the isolation power supply outputs 5V voltage, and the reference voltage supply end of the isolation power supply outputs 5V voltage.
Preferably, the digital isolator is in signal transmission with the micro control unit through an SPI communication protocol.
A PCBA test system based on a DMM board card comprises a PCBA (Printed Circuit board assembly, PCBA for short) switching board card, a switching connector, a total switching board card, a board-to-board connector, a mother board, a DMM board card, an MCU board card, an industrial personal computer, a power connector and a power supply, wherein the PCBA switching board card is in telecommunication connection with the total switching board card through the switching connector, the DMM board card and the MCU board card are integrated onto the mother board, the mother board is in telecommunication connection with the total switching board card through the board-to-board connector, the power supply is in telecommunication connection with the total switching board card through the power connector, and the industrial personal computer is in telecommunication connection with the total switching board card through an RJ45 network interface; the PCBA switching board transmits a voltage current signal of the PCBA to be tested to the DMM board card through the total switching board card, the DMM board card converts the voltage current signal into a digital signal and transmits the digital signal to the MCU board card through the mother board, and the MCU board card is in telecommunication connection with the industrial personal computer through an RJ45 network port on the total switching board card.
Preferably, the DMM board card adopts any one of the small DMM test board cards described above.
Preferably, the total switching board card is in telecommunication connection with the PCBA switching board cards through a plurality of switching connectors, so that a plurality of PCBAs to be detected are detected simultaneously.
Compared with the prior art, the invention has the beneficial effects that: the DMM board card and the testing system are small in size, low in cost, simple and easy to operate in the detection method and convenient to popularize and apply.
Drawings
FIG. 1 is a schematic diagram of a small DMM test board of the present invention;
fig. 2 is a schematic diagram of a PCBA test system using a small DMM test board.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, a small DMM test board includes a current analog-to-digital conversion branch, a power supply module, and a voltage analog-to-digital conversion branch.
Current analog-to-digital conversion branch
The current analog-to-digital conversion branch comprises a current acquisition input end, a sampling resistor, an instrument operational amplifier, an analog-to-digital converter and a digital isolator which are sequentially connected; the current to be measured flows through the sampling resistor through the current acquisition input end, weak voltage is formed at two ends of the sampling resistor, the weak voltage at two ends of the sampling resistor is amplified by the instrument operational amplifier and then is transmitted to the analog-to-digital converter, and the analog-to-digital converter converts the amplified voltage into a digital signal and transmits the digital signal to the micro control unit through the digital isolator.
And the weak voltage at two ends of the sampling resistor is amplified by 10 times by the instrument operational amplifier.
Wherein, the digital isolator adopts a 4-channel digital isolator.
The digital isolator is in signal transmission with the micro control unit through an SPI communication protocol.
Power supply module
The power supply module comprises a power supply input end, an isolation power supply, an amplifier power supply end, a first low dropout linear regulator, a second low dropout linear regulator and a reference voltage supply end; the power supply input end supplies power to the isolation power supply, the isolation power supply supplies power to the instrument operational amplifier through the amplifier power supply end, and supplies first low-voltage electricity, second low-voltage electricity and reference voltage to the analog-to-digital converter through the first low-voltage difference linear voltage stabilizer, the second low-voltage difference linear voltage stabilizer and the reference voltage supply end.
The power supply input end supplies 12V voltage, the amplifier power supply end of the isolation power supply outputs +/-12V voltage, the first low-dropout linear regulator of the isolation power supply outputs 3V voltage, the second low-dropout linear regulator of the isolation power supply outputs 5V voltage, and the reference voltage supply end of the isolation power supply outputs 5V voltage.
Voltage analog-digital conversion branch
The voltage analog-to-digital conversion branch comprises a voltage acquisition input end, an analog-to-digital converter and a digital isolator which are sequentially connected; the voltage to be measured is directly input to the analog-to-digital converter through the voltage acquisition input end, and the analog-to-digital converter converts the input voltage into a digital signal and transmits the digital signal to the micro control unit through the digital isolator.
Parameters of each device are as follows:
an instrument operational amplifier: AD8422 BRMZ;
isolating a power supply: a1212XT-1WR 2;
first low dropout linear regulator (LDO-3V): ADP7118 ARDZ-3.3V-R7;
second low dropout linear regulator (LDO-5V): ADP7118 ARDZ-3.3V-R7;
reference voltage supply terminal (5V): ADR4550 BRZ;
an analog-to-digital converter: AD7175-2 BRUZ;
4-channel digital isolator: ADUM7441 CRQZ.
Referring to fig. 2, a PCBA test system based on a DMM board includes a PCBA adapter board, an adapter connector, a total adapter board, a board-to-board connector, a motherboard, a DMM board, an MCU board, an industrial personal computer, a power connector, and a power supply.
The system comprises a master board, a master adapter board, a power supply, a power connector, a PCBA adapter board card, a DMM board card and an MCU board card, wherein the PCBA adapter board card is in telecommunication connection with the master adapter board card through an adapter connector, the DMM board card and the MCU board card are integrated onto the master board, the master board is in telecommunication connection with the master adapter board card through a board-to-board connector, the power supply is in telecommunication connection with the master adapter board card through the power connector, and the; the PCBA switching board transmits a voltage current signal of the PCBA to be tested to the DMM board card through the total switching board card, the DMM board card converts the voltage current signal into a digital signal and transmits the digital signal to the MCU board card through the mother board, and the MCU board card is in telecommunication connection with the industrial personal computer through an RJ45 network port on the total switching board card.
During operation, can place PCBA and carry out automatic test simultaneously on a plurality of PCBA switching integrated circuit boards, easy operation, it is efficient, the good reliability.
The DMM board card adopts the small DMM test board card.
Test method
During testing, a product to be tested PCBA is placed into the fixture, a start button of a control software interface on a control interface of the industrial personal computer is clicked, and then the upper computer test software issues a command according to a program. Firstly, from an initial state, the forward cylinder can operate to bring the carrier plate into a light shielding environment, then the upward cylinder can be pressed down to supply power to a product to be detected through a power supply, and then the DMM board card collects and processes voltage and current data and returns the voltage and current data to the industrial personal computer so as to judge whether the product is normal or defective. The method is simple to operate and convenient to learn.
In conclusion, the product has the advantages of low cost, strong adaptability, easy operation and strong reliability.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a small-size DMM test board card, includes current analog-to-digital conversion branch road, power module and voltage analog-to-digital conversion branch road, its characterized in that:
the current analog-to-digital conversion branch comprises a current acquisition input end, a sampling resistor, an instrument operational amplifier, an analog-to-digital converter and a digital isolator which are sequentially connected; the current to be measured flows through the sampling resistor through the current acquisition input end, weak voltage is formed at two ends of the sampling resistor, the weak voltage at two ends of the sampling resistor is amplified by the instrument operational amplifier and then is transmitted to the analog-to-digital converter, and the analog-to-digital converter converts the amplified voltage into a digital signal and transmits the digital signal to the micro control unit through the digital isolator;
the power supply module comprises a power supply input end, an isolation power supply, an amplifier power supply end, a first low dropout linear regulator, a second low dropout linear regulator and a reference voltage supply end; the power supply input end supplies power to the isolation power supply, the isolation power supply supplies power to the instrument operational amplifier through the amplifier power supply end, and supplies first low-voltage electricity, second low-voltage electricity and reference voltage to the analog-to-digital converter through the first low-voltage difference linear voltage stabilizer, the second low-voltage difference linear voltage stabilizer and the reference voltage supply end;
the voltage analog-to-digital conversion branch comprises a voltage acquisition input end, an analog-to-digital converter and a digital isolator which are sequentially connected; the voltage to be measured is directly input to the analog-to-digital converter through the voltage acquisition input end, and the analog-to-digital converter converts the input voltage into a digital signal and transmits the digital signal to the micro control unit through the digital isolator.
2. The small DMM test board of claim 1, wherein: and weak voltage at two ends of the sampling resistor is amplified by 10 times by the instrument operational amplifier.
3. The small DMM test board of claim 1, wherein: the digital isolator adopts a 4-channel digital isolator.
4. The small DMM test board of claim 1, wherein: the power supply input end supplies 12V voltage, the amplifier power supply end of the isolation power supply outputs +/-12V voltage, the first low-dropout linear voltage regulator of the isolation power supply outputs 3V voltage, the second low-dropout linear voltage regulator of the isolation power supply outputs 5V voltage, and the reference voltage supply end of the isolation power supply outputs 5V voltage.
5. The small DMM test board of claim 1, wherein: and the digital isolator is in signal transmission with the micro control unit through an SPI communication protocol.
6. The utility model provides a PCBA test system based on DMM integrated circuit board which characterized in that: the system comprises a PCBA (printed circuit board assembly) switching board card, a switching connector, a total switching board card, a board-to-board connector, a motherboard, a DMM (digital multimedia module) board card, an MCU (microprogrammed control unit) board card, an industrial personal computer, a power connector and a power supply, wherein the PCBA switching board card is in telecommunication connection with the total switching board card through the switching connector, the DMM board card and the MCU board card are integrated onto the motherboard, the motherboard is in telecommunication connection with the total switching board card through the board-to-board connector, the power supply is in telecommunication connection with the total switching board card through the power connector, and the industrial; the PCBA switching board transmits a voltage current signal of the PCBA to be tested to the DMM board card through the total switching board card, the DMM board card converts the voltage current signal into a digital signal and transmits the digital signal to the MCU board card through the mother board, and the MCU board card is in telecommunication connection with the industrial personal computer through an RJ45 network port on the total switching board card.
7. The PCBA test system as recited in claim 6, wherein: the DMM board card adopts a small DMM test board card according to any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911288839.9A CN110780187A (en) | 2019-12-12 | 2019-12-12 | Small-size DMM test board card and PCBA test system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911288839.9A CN110780187A (en) | 2019-12-12 | 2019-12-12 | Small-size DMM test board card and PCBA test system |
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| CN110780187A true CN110780187A (en) | 2020-02-11 |
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| CN201911288839.9A Pending CN110780187A (en) | 2019-12-12 | 2019-12-12 | Small-size DMM test board card and PCBA test system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413608A (en) * | 2020-04-22 | 2020-07-14 | 苏州市运泰利自动化设备有限公司 | PCBA test system and method |
| CN112240974A (en) * | 2020-11-06 | 2021-01-19 | 苏州市运泰利自动化设备有限公司 | Multichannel board card-level BFT test platform |
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| CN102253270A (en) * | 2011-07-01 | 2011-11-23 | 厦门市老科学技术工作者协会 | Electronic AC (Alternating Current) nanovoltmeter |
| CN106094966A (en) * | 2016-08-25 | 2016-11-09 | 黄继颇 | A kind of linear voltage regulator of wideband high PSRR |
| CN208721737U (en) * | 2018-08-20 | 2019-04-09 | 广州思林杰网络科技有限公司 | A kind of ADC Acquisition Circuit applied in current-voltage measurement board |
| CN208795772U (en) * | 2018-08-20 | 2019-04-26 | 广州思林杰网络科技有限公司 | A kind of test board |
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2019
- 2019-12-12 CN CN201911288839.9A patent/CN110780187A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253270A (en) * | 2011-07-01 | 2011-11-23 | 厦门市老科学技术工作者协会 | Electronic AC (Alternating Current) nanovoltmeter |
| CN106094966A (en) * | 2016-08-25 | 2016-11-09 | 黄继颇 | A kind of linear voltage regulator of wideband high PSRR |
| CN208721737U (en) * | 2018-08-20 | 2019-04-09 | 广州思林杰网络科技有限公司 | A kind of ADC Acquisition Circuit applied in current-voltage measurement board |
| CN208795772U (en) * | 2018-08-20 | 2019-04-26 | 广州思林杰网络科技有限公司 | A kind of test board |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413608A (en) * | 2020-04-22 | 2020-07-14 | 苏州市运泰利自动化设备有限公司 | PCBA test system and method |
| CN112240974A (en) * | 2020-11-06 | 2021-01-19 | 苏州市运泰利自动化设备有限公司 | Multichannel board card-level BFT test platform |
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Application publication date: 20200211 |
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