CN206740861U - A kind of Milliohm resistance tester - Google Patents
A kind of Milliohm resistance tester Download PDFInfo
- Publication number
- CN206740861U CN206740861U CN201720562133.7U CN201720562133U CN206740861U CN 206740861 U CN206740861 U CN 206740861U CN 201720562133 U CN201720562133 U CN 201720562133U CN 206740861 U CN206740861 U CN 206740861U
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- CN
- China
- Prior art keywords
- signal
- phase shift
- msp430 single
- circuit
- chip microcomputers
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
A kind of Milliohm resistance tester, the alternating current that signal generator produces 1KHz measures measured resistance as sinusoidal constant current drive, high resistant difference amplifier forms the preposition amplification of small-signal, digital phase shift can realize the scanning phase shift function of 0 180 degree, the reference signal input as lock phase amplifying circuit.Lock phase amplifying circuit and input signal is amplified into conditioning, the storage and processing of data signal input MSP430 single-chip microcomputer progress data are converted into by serial a/d converter.Control signal is inputted MSP430 single-chip microcomputers by keyboard circuit, and MSP430 single-chip microcomputers are shown after input data is handled by display circuit；Utility model works are stable to have higher accuracy of measurement, in test process, replace manual phase shift that tester can be made more intelligent using automatic shifting phase, the power consumption of test system is reduced simultaneously, optimize systematic function, test system is set to support battery powered, it is easy to operate and use, and the miniaturization of micro resistance tester facilitates daily carrying and use.
Description
Technical field
Test equipment technology is the utility model is related to, for the measurement of milliohm rank Minitype resistance, more particularly to one
Kind Milliohm resistance tester.
Background technology
In industrial production and scientific research, the measurement problem of Minitype resistance is frequently encountered, also often resistivity measurement
The means being monitored as a kind of structure to material and physical form change.To battery in military, industrial and civilian
The measurement of internal resistance, the internal resistance size of battery is to reflect that can it normally provide the important parameter of electric current output, due to battery
Internal resistance is milliohm level, and in general pointer and digital multimeter can not be measured.The conventional method of microresistivity survey has bridge method and straight
Connect mensuration.Bridge measurement is more accurate, but this measuring method is cumbersome, it is impossible to on-line measurement and can not directly read quilt
Measuring resistance resistance.The direct method of measurement is simple and quick, but it can not overcome the influence of lead resistance and contact resistance to measurement result,
It is unsuitable for being used in the occasion of measurement Minitype resistance.
The content of the invention
The defects of in order to overcome prior art, the purpose of this utility model are to provide a kind of Milliohm resistance tester, energy
Enough overcome the influence of internal noise and external electromagnetic interference, realize the accurate measurement to Minitype resistance.
In order to achieve the above object, the technical solution of the utility model is：
A kind of Milliohm resistance tester, including signal generator 1-1, signal generator 1-1 produce 1KHz alternating current
Stream is connected to measured resistance 1-3, measured resistance 1-3 connection high resistant difference amplifier 1-4, high resistant as sinusoidal constant current drive 1-2
Difference amplifier 1-4 signal output part connection lock phase amplifying circuit 1-5, signal generator 1-1 signal end connection numeral are moved
Phase 1-6, digital phase shift 1-6 realize that scanning phase shift function connects lock phase amplifying circuit 1-5 as reference signal, lock phase amplifying circuit
1-5 is connected by A/D converter 1-7 with MSP430 single-chip microcomputers 1-8, and MSP430 single-chip microcomputer 1-8 signal ends are connected to display
Circuit 1-9 and keyboard circuit 1-10.
Described MSP430 single-chip microcomputers 1-8 DAC7811 chips carry out voltage stabilizing power supply using LM1117-3.3 voltage stabilizing chips.
Described display circuit 1-9, as controller, the signal that modulate circuit exports is sent using MSP430 single-chip microcomputers 1-8
The I/O mouths for entering single-chip microcomputer carry out A/D conversions, are as a result shown by QC12864B liquid crystal displays.
Control signal is inputted MSP430 single-chip microcomputers 1-8 to complete the storage of data, processing by described keyboard circuit 1-10
And display etc..
The beneficial effects of the utility model are：The utility model is reasonably connected hardware circuit unit, is added
Digital phase shift 1-6, manual phase shift is replaced using automatic shifting phase, makes it more intelligent, while reduce its power consumption, optimization systematicness
Can, and battery powered is supported, it is easy to operate and use.By testing utility model works stabilization, have higher measurement accurate
Exactness, it is convenient for carrying and uses；Described signal generator 1-1 uses the ac-excited sources of 1kHz, overcome exchange injection method because
Interference of the 50Hz power frequency components to test equipment；Response signal is amplified by high resistant low-noise preamplifier, and modulate circuit uses
Integrated phase lock amplifying technology, restrained effectively noise and external interference.
Brief description of the drawings
Fig. 1 is Tthe utility model system structural representation.
Fig. 2 is digital phase shift 1-6 program flow diagrams.
Fig. 3 is that LCD shows subfunction program flow diagram.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
The utility model is further elaborated.
Reference picture 1, a kind of Milliohm resistance tester, including signal generator 1-1, signal generator 1-1 produce 1KHz
Alternating current be connected to measured resistance 1-3, measured resistance 1-3 connection high resistant difference amplifiers as sinusoidal constant current drive 1-2
1-4, high resistant difference amplifier 1-4 signal output part connection lock phase amplifying circuit 1-5, signal generator 1-1 signal end connect
Digital phase shift 1-6 is met, digital phase shift 1-6 realizes that scanning phase shift function connects lock phase amplifying circuit 1-5 as reference signal, locks phase
Amplifying circuit 1-5 is connected by A/D converter 1-7 with MSP430 single-chip microcomputers 1-8, and lock phase amplifying circuit 1-5 puts input signal
Big conditioning, by serial a/d converter 1-7 be converted into data signal input MSP430 single-chip microcomputers 1-8 carry out the storages of data with
Processing, MSP430 single-chip microcomputer 1-8 signal ends are connected to display circuit 1-9 and keyboard circuit 1-10,
Described MSP430 single-chip microcomputers 1-8 DAC7811 chips carry out voltage stabilizing power supply using LM1117-3.3 voltage stabilizing chips.
Described display circuit 1-9, as controller, the signal that modulate circuit exports is sent using MSP430 single-chip microcomputers 1-8
The I/O mouths for entering single-chip microcomputer carry out A/D conversions, are as a result shown by QC12864B liquid crystal displays.
Control signal is inputted MSP430 single-chip microcomputers 1-8 to complete the storage of data, processing by described keyboard circuit 1-10
And display etc..
Operation principle of the present utility model is：The alternating current that signal generator 1-1 produces 1KHz swashs as sinusoidal constant current
Encourage 1-2 measurements measured resistance 1-3, high resistant difference amplifier 1-4 and form the preposition amplification of small-signal, digital phase shift 1-6 can be with
The scanning phase shift function of 0-180 degree is realized, the reference signal input as lock phase amplifying circuit 1-5.Locking phase amplifying circuit 1-5 will
Input signal amplification conditioning, it is converted into data signal input MSP430 single-chip microcomputers 1-8 by serial a/d converter 7 and carries out data
Storage and processing.Keyboard circuit 1-10 will input control signal input MSP430 single-chip microcomputers 1-8, MSP430 single-chip microcomputer 1-8
Shown after data processing by display circuit 1-9.
Reference picture 2, the utility model realize that digital phase shift 1-6 program circuits are：Opened into digital phase shift subprogram task
Beginning 2-1, initiating port 2-2 complete the subprogram port and assign initial value, and clock initialization 2-3 completes clock and assigns initial value, at the beginning of button
Beginningization 2-4 completes key assignments and assigns initial value, selects two branch roads into whether decision block button interrupts 2-5, a keys interrupt enters
Branch road adjusts phase shift time delay 2-6, and another button does not interrupt into branch road and rejudge whether button interrupts 2-5.Adjust
Enter whether decision block P1.7 is that high level 2-7 selects two branch roads after the completion of whole phase shift time delay 2-6, a P1.7 is height
It is that low level enters branch road P1.1 output low levels 2-9 that level, which enters branch road P1.1 output high level 2-8, another P1.7,.
Enter delay X cycle 2-10 processes after the completion of P1.1 output high level 2-8, be returned to and sentence after the completion of delay X cycle 2-10 processes
Whether disconnected frame P1.7 is that subsequent content is completed in circulation until hardware sub-routine ends at high level 2-7.
Reference picture 3, the utility model realize that LCD display subroutine flows are：Start 3-1 into display subroutine task,
Close WatchDog Timer 3-2, setting clock is 8MHz3-3, initialization P3, P4 mouth 3-4, LCD initialization subroutine 3-5 processes
The subprogram is completed to assign initial value and test whether LCD viewing hardwares circuit function is normal, and cls 3-6 processes make LCD display clear
Zero, wait test data to be shown.Call subfunction function 3-7 to complete test data display function, terminate 3-8 into task and enter
Journey, terminate the subroutine flow.
Based on above-mentioned implementation, the utility model has carried out a series of tests, and choice accuracy is surveyed up to 0.05% special impedance
Try instrument and this tester.It is the experimental data for being tested to obtain below：
The utility model is tested micro resistance using exchange constant current drive method, and the system in measurement process that reduces produces
Error, design requirement can be reached substantially, system can measure to 100m Ω~10m Ω resistance, and test performance is stable.
Claims (2)
1. a kind of Milliohm resistance tester, it is characterised in that including signal generator (1-1), signal generator (1-1) produces
1KHz alternating current is connected to measured resistance (1-3), measured resistance (1-3) connection high resistant as sinusoidal constant current drive (1-2)
Difference amplifier (1-4), the signal output part connection lock phase amplifying circuit (1-5) of high resistant difference amplifier (1-4), signal occur
The signal end connection digital phase shift (1-6) of device (1-1), digital phase shift (1-6) realize that scanning phase shift function connects as reference signal
Lock phase amplifying circuit (1-5) is connect, lock phase amplifying circuit (1-5) passes through A/D converter (1-7) and MSP430 single-chip microcomputers (1-8) phase
Even, MSP430 single-chip microcomputers (1-8) signal end is connected to display circuit (1-9) and keyboard circuit (1-10).
2. a kind of Milliohm resistance tester, it is characterised in that the DAC7811 chips of described MSP430 single-chip microcomputers (1-8) are adopted
Voltage stabilizing power supply is carried out with LM1117-3.3 voltage stabilizing chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720562133.7U CN206740861U (en) | 2017-05-19 | 2017-05-19 | A kind of Milliohm resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720562133.7U CN206740861U (en) | 2017-05-19 | 2017-05-19 | A kind of Milliohm resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206740861U true CN206740861U (en) | 2017-12-12 |
Family
ID=60567198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720562133.7U Expired - Fee Related CN206740861U (en) | 2017-05-19 | 2017-05-19 | A kind of Milliohm resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206740861U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112292605A (en) * | 2018-04-24 | 2021-01-29 | 豪夫迈·罗氏有限公司 | Method for determining system resistance of handheld medical device |
-
2017
- 2017-05-19 CN CN201720562133.7U patent/CN206740861U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112292605A (en) * | 2018-04-24 | 2021-01-29 | 豪夫迈·罗氏有限公司 | Method for determining system resistance of handheld medical device |
| US11747377B2 (en) | 2018-04-24 | 2023-09-05 | Roche Diagnostics Operations, Inc. | Method for determining the system resistance of a handheld medical device |
| CN112292605B (en) * | 2018-04-24 | 2024-05-07 | 豪夫迈·罗氏有限公司 | Method for determining system resistance of handheld medical device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171212 Termination date: 20180519 |