CN107064781A - A kind of simple resistor network automatic test approach - Google Patents
A kind of simple resistor network automatic test approach Download PDFInfo
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- CN107064781A CN107064781A CN201710492432.2A CN201710492432A CN107064781A CN 107064781 A CN107064781 A CN 107064781A CN 201710492432 A CN201710492432 A CN 201710492432A CN 107064781 A CN107064781 A CN 107064781A
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- Prior art keywords
- test
- digital multimeter
- resistor network
- computer
- network automatic
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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
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
Abstract
The invention discloses a kind of simple resistor network automatic test approach, the two ends for the different aisle resistances tested needed for the red test pencil of digital multimeter is shorted into circuit-under-test from black meter pen；Conducting and closure that the low and high level control relay that computer is exported by data collecting card is switched, realize that the red test pencil of digital multimeter and the selection of black meter pen switch；Computer is controlled by instrument controlling card to digital multimeter, digital multimeter is controlled to read circuit-under-test resistivity measurements, and measured result is returned to by computer by the gpib interface of digital multimeter, LabVIEW test softwares on computer are contrasted the resistance value collected and parameter area, judge whether the aisle resistance is qualified.The method of the present invention greatly reduces the workload of tester, improves operating efficiency and reliability, simplifies test process；Do not need additional single machine unit, keyboard unit etc., it is not necessary to manual intervention, improve the reliability of system.
Description
Technical field
The present invention relates to a kind of resistor network automatic test approach, belong to circuit testing technology field.
Background technology
With extensively should for the fast development of science and technology, particularly digital technology and various super large-scale integration
With the structure of hydrid integrated circuit becomes increasingly complex, and function is more and more perfect.Although the performance of circuit system is improved,
It is that testing process complexity, high testing time length, human cost, maintenance support difficulty, dimension are also generated to test and maintenance support
A series of problems, such as repairing costly, these problems have had a strong impact on the integrity and life cycle of circuit.Traditional circuit test
System, it is low to there is speed, the problems such as reliability, maintainability, Sustainable Exploitation, visual difference, seeks a kind of simple, side
Just, efficiently circuit board detection method becomes particularly important, so by the virtual instrument skill of LabVIEW graphical programming languages
Art realizes that circuit test turns into a kind of urgent requirement.
The content of the invention
The technical problems to be solved by the invention are to overcome the defect of prior art there is provided a kind of simple resistor network is automatic
Method of testing, simplifies test process, reduces test job amount, improves reliability.
In order to solve the above technical problems, the present invention provides a kind of simple resistor network automatic test approach, it is characterized in that,
The two ends for the different aisle resistances tested needed for the red test pencil of digital multimeter is shorted into circuit-under-test from black meter pen；
Conducting and closure that the low and high level control relay that computer is exported by data collecting card is switched, by relay switch
Conducting and closure realize that the red test pencil of digital multimeter and the selection of black meter pen switch；
Computer is controlled by instrument controlling card to digital multimeter, and control digital multimeter reads circuit-under-test resistance and surveyed
Value, and measured result is returned to by computer by the gpib interface of digital multimeter, the LabVIEW on computer
Test software is contrasted the resistance value collected and parameter area, if being judged as that this leads within the difference range of setting
Road resistance is qualified, otherwise is judged as unqualified.
To after being measured of all aisle resistances, the corresponding test mould of test event selection in resistance test
Plate, according to test template and circuit-under-test product batch number, serial number gencration test report.
Relay switch provides power supply by constant-current source.
Drive circuit is connected between data collecting card and relay switch.
The drive circuit is driving chip ULN2803A.
Data collecting card uses multifunctional digital capture card PCI-6503.
Instrument controlling card is PCI-GPIB transition cards.
The beneficial effect that the present invention is reached：
（1）The present invention is the resistor network automatic test approach based on LabVIEW, and tester need to only configure the ginseng of test product
Number scope, resistor network testing process can be completed in a short time by clicking on test button.Greatly reduce the work of tester
Measure, improve operating efficiency and reliability, simplify test process, while realizing the collection of resistor network test data, place
Reason and storage, provide foundation for follow-up data analysis, guarantee are provided for the volume production of product.
（2）Proprietary resistance automatic test system based on network of the present invention, using common hardware collecting unit, it is not necessary to additional monolithic
Machine unit, keyboard unit etc., it is not necessary to manual intervention, improve the reliability of system.
Brief description of the drawings
Fig. 1 testboard theory diagrams；
Fig. 2 relay switching circuits；
Fig. 3 resistance test flow charts.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
Auto-Test System hardware is by constant current source current, digital multimeter, relay switch, data collecting card, instrument control
The part such as fabrication, computer is constituted, and its test principle block diagram is shown in Fig. 1.Computer passes through data collecting card control relay
What is switched opens closure, so as to realize red, black meter pen the selection switching of universal meter；Computer is by instrument controlling card to numeral
Universal meter is controlled, and reads circuit-under-test resistivity measurements.The resistance passback display of measurement is on computers, automatic to remember
Data are recorded, while generating testing journal sheet.
Auto-Test System is selected using controlling switch, it is necessary to automatically select measurement resistor network in the design
Resistance.Controlling switch can be by two kinds of building forms：One kind is made up of analog switch, it is another be by relay group into.Mould
Intend switch composition advantage be that can save big metering device, save chip area, but test system measurement contain less resistive,
It is larger in view of analog switch conducting resistance, the measurement accuracy of small resistor is influenceed, so from relay group into switch.While after
Electric switch has the advantages that relatively low cost, measurement dynamic range be wide, versatility is preferable, in middle-size and small-size Auto-Test System
In switch designs, relay switch is optimal selection.
According to the operation principle of relay, conventional relay can be divided into solid-state relay, electromagnetic relay, temperature relay
Device etc..Requirement and cost in view of test, have selected electromagnetic relay, and its operation principle is that coil two ends have pressure difference, line
Electric current will be produced in circle, electric current flows through coil generating electromagnetic sensing, and armature will be drawn to iron core in the presence of suction, and contact is closed
Close.Otherwise pressure differential collapses, then armature will return to original position under the pulling force effect of spring, contact disconnects.
, it is necessary to which larger current, drives because data collecting card digital I/O port exports Transistor-Transistor Logic level when relay adhesive action
Kinetic force is poor, it is impossible to directly export low and high level by digital I/O port come the folding of direct control relay.So defeated
Going out before control signal reaches relay needs to add drive circuit.From drive chip of high-power ULN2803A.The main of it should
There are relay driving, illuminating lamp driving, solenoid-driven, servomotor and pipe driving stepper motor etc. with field.ULN2803A
It is the darlington array of high withstand voltage high current, every is made up of 7 Darlington transistors, each Darlington transistor is connected a 2.7K
Base resistance, it can be joined directly together with TTL and COMS circuits under 5V operating voltage, and its export structure is opened for colelctor electrode
Road.When exporting relay termination as load, if input is low level, output end is then high level.If conversely, input is
High level, output end is then low level, and now electric current is to be loaded to pour into Darlington transistor by relay by power supply, and sink current is most
High reachable 500mA.In the present embodiment, the G6V-2 relays of electromagnetic relay selection OMRON companies, 5V powers, relay switch
Circuit diagram is shown in Fig. 2.
The need for controlling multicircuit relay according to Auto-Test System, the multi-functional of NI companies of the U.S. is selected in the present embodiment
Data Acquisition Card PCI-6503.PCI-6503, which possesses 24 programmable peripheral interfaces, can obtain 24 railway digital input/output ports,
Voltage range 5VTTL, open state is input high-impedance state, and maximum output current 4mA, peak transfer rate is 50kb/s, static
Speed is continuously transmitted in 1kb/s to 10kb/s.
Instrument controlling card is PCI-GPIB transition cards, and its communications protocol is IEEE488.1, and transmission rate reaches 1.5Mb/s.
As long as possessing the instrument of gpib interface can be attached with instrument controlling card.Gpib interface be at present it is the most frequently used, most into
The interface of ripe intelligence instrument, is a critically important part of automatic monitored control system, for by all intelligence of system
Instrument and equipment connects into an organic whole.
In the present embodiment, six Semi-digital multimeters of keithley2000 types are selected to carry out resistance measurement, according to electricity
Standard resistance range, uses twin wire resistance measurement mode.Keithley company provides universal meter and uses the equipment under LabVIEW environment
Driving, so programming are just easily quick, it should be noted that each GPIB equipment has a uniquely address, GPIB addresses by
Two parts are constituted, and a part is main address, and another part is sub-address, are " main address+sub-address " in literary style.For example
GPIB0::1::, main address is 0, represents the address of board, sub-address is 1, the address of controlled device is represented, when there is polylith GPIB
When board, it should be pointed out that main address, otherwise it can omit.Keithley2000 gpib interface default address is 16, ground
Location can be checked and change in instrument front panel.
Resistor network test flow chart is as shown in Figure 3.Initialization test instrument is configuration universal meter first
Keithley2000 and capture card PCI-6503.Universal meter is configured to twin wire resistance measurement pattern, PCI- by this secondary design
6503 capture cards are configured to numeral output pattern.After the completion of configuration, the height that computer software passes through capture card digital output
Level carries out relay conducting and closure, and the red-black test pencil of universal meter is shorted to the different passages electricity tested needed for circuit-under-test
The two ends of resistance, universal meter reads resistance value, and measured result then is returned into computer by the gpib interface of universal meter,
Then LabVIEW test softwares contrast the resistance value collected and parameter area, if be judged as within the scope of it is qualified, instead
Be judged as it is unqualified.Circulate successively, complete the measurement to all aisle resistances, after being measured, software is according to resistance test
In test event select corresponding test template, according to test template and circuit product batch number, serial number gencration word forms
Test report, preserves test data, supplies the work such as access, the data statistics of tester.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these improve and deformed
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of simple resistor network automatic test approach, it is characterized in that,
The two ends for the different aisle resistances tested needed for the red test pencil of digital multimeter is shorted into circuit-under-test from black meter pen；
Conducting and closure that the low and high level control relay that computer is exported by data collecting card is switched, by relay switch
Conducting and closure realize that the red test pencil of digital multimeter and the selection of black meter pen switch；
Computer is controlled by instrument controlling card to digital multimeter, and control digital multimeter reads circuit-under-test resistance and surveyed
Value, and measured result is returned to by computer by the gpib interface of digital multimeter, the LabVIEW on computer
Test software is contrasted the resistance value collected and parameter area, if being judged as that this leads within the difference range of setting
Road resistance is qualified, otherwise is judged as unqualified.
2. a kind of simple resistor network automatic test approach according to claim 1, it is characterized in that, to all aisle resistances
Be measured after, test event in resistance test selects corresponding test template, according to test template and tested electricity
Road product batch number, serial number gencration test report.
3. a kind of simple resistor network automatic test approach according to claim 1, it is characterized in that, relay switch is by perseverance
Stream source provides power supply.
4. a kind of simple resistor network automatic test approach according to claim 1, it is characterized in that, data collecting card with after
Drive circuit is connected between electric switch.
5. a kind of simple resistor network automatic test approach according to claim 4, it is characterized in that, the drive circuit is
Driving chip ULN2803A.
6. a kind of simple resistor network automatic test approach according to claim 1, it is characterized in that, data collecting card is used
Multifunctional digital capture card PCI-6503.
7. a kind of simple resistor network automatic test approach according to claim 1, it is characterized in that, instrument controlling card is
PCI-GPIB transition cards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710492432.2A CN107064781A (en) | 2017-06-26 | 2017-06-26 | A kind of simple resistor network automatic test approach |
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| CN201710492432.2A CN107064781A (en) | 2017-06-26 | 2017-06-26 | A kind of simple resistor network automatic test approach |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111830392A (en) * | 2020-06-18 | 2020-10-27 | 中国船舶重工集团公司第七0七研究所 | Method for screening quartz flexible accelerometer servo plate based on HP3458A digital multimeter |
| CN112114244A (en) * | 2020-09-08 | 2020-12-22 | 深圳市拓普泰克电子有限公司 | Automatic test circuit, automatic test instrument and automatic test system |
| CN113515419A (en) * | 2021-06-29 | 2021-10-19 | 北京航天光华电子技术有限公司 | Automatic multi-channel data acquisition system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111830392A (en) * | 2020-06-18 | 2020-10-27 | 中国船舶重工集团公司第七0七研究所 | Method for screening quartz flexible accelerometer servo plate based on HP3458A digital multimeter |
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| CN113515419A (en) * | 2021-06-29 | 2021-10-19 | 北京航天光华电子技术有限公司 | Automatic multi-channel data acquisition system and method |
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Application publication date: 20170818 |