CN103235189B - A kind of micro-resistance high-precision measuring method based on double-current voltage ratio method and realize the measuring system of the method - Google Patents
A kind of micro-resistance high-precision measuring method based on double-current voltage ratio method and realize the measuring system of the method Download PDFInfo
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Abstract
A kind of micro-resistance high-precision measuring method based on double-current voltage ratio method and realize the measuring system of the method, relate to a kind of high-precision measuring method and system thereof of resistance, be specifically related to a kind of detection method and system thereof of Minitype resistance, object is to solve in existing microresistivity survey technology power supply precision and be superimposed upon the problem of the DC influence in measured micro voltage signal on the impact of measuring accuracy, measuring system of the present invention comprises measured resistance, measuring resistance, adjustable current-limiting resistance, controllable electric power, filter amplifier, A/D converter, Single Chip Microcomputer (SCM) system, display and operation keyboard, first, voltage ratio method is adopted to eliminate power supply to the impact of measuring accuracy, secondly, the interference voltages in the resistance of measured resistance is eliminated by double current method, the present invention is applicable to microresistivity survey technical field.
Description
Technical field
The present invention relates to a kind of high-precision measuring method and system thereof of resistance, be specifically related to a kind of detection method and system thereof of Minitype resistance.
Background technology
In electrical engineering field, often run into the problem of microresistivity survey, as conductor material resistivity measurement, unit length conductor DC resistance measurement etc.Due to this slightly resistance be often in tens μ Ω to the tens m Ω orders of magnitude, measure more difficult.At present, microresistivity survey instrument market provided is generally direct-flow double bridge and digital micro-OHM meter.Direct-flow double bridge needs balance adjustment, and Automatic survey degree is low and easily change by adjustable element and human factor affects; Digital micro-OHM meter generally adopts constant current source and high accuracy number voltage measurement technologies, and Automatic survey degree, measuring speed and accuracy of measurement are high, has the trend progressively substituting direct-flow double bridge.In the development process of digital micro-OHM meter, Major Difficulties is the making of high precise current source, the data acquisition of high precision micro voltage signal and Anti-Jamming Technique.Wherein high precise current source makes difficulty, affects the class of accuracy of microresistivity survey always; The data acquisition of high precision micro voltage can utilize high performance operational amplifier and the solution of high-order A/D converter that market provides; Interference generally comprises electric jamming, magnetic interference and DC influence, the interference of electromagnetic field effectively can be suppressed by the method for shielding and filtering, DC influence is directly superimposed upon in measured micro voltage signal, accurately measure and produce very large impact, and rejection ratio is more difficult on micro-resistance.
Measure in ultimate principle in voltage ratio method, effectively can suppress AC influence by technology such as shielding and filtering, have ignored DC influence to the impact of measuring.The imbalance of the thermoelectrical potential of measuring circuit, amplifying circuit and temperature drift etc. form DC influence, and be superimposed upon in measured voltage drop, because measured voltage drop is faint, the DC influence of superposition can produce very large measuring error, and existing measuring method all cannot be eliminated.Found by actual measurement, see for a long time, this DC influence affects by factors such as temperature variation can produce certain fluctuation.
Summary of the invention
The object of the invention is to solve in existing microresistivity survey technology power supply precision and be superimposed upon the problem of the DC influence in measured micro voltage signal on the impact of measuring accuracy, the present invention proposes a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method and realize the measuring system of the method.
A kind of micro-resistance high-precision measuring method based on double-current voltage ratio method, detailed process is as follows, first, power supply outgoing side measured resistance, fixed value resistance and adjustable current-limiting resistance being connected on controllable direct current power supply forms series connection closed-loop path, the output voltage of described controllable direct current power supply is E, and the resistance of measured resistance is R
x, the resistance of fixed value resistance is R
0, the resistance of adjustable current-limiting resistance is R
1, adopt four-wire ohm measuring method to measure the measuring voltage U obtaining fixed value resistance two ends
1, measured resistance two ends measuring voltage U
2electric current I with series connection closed-loop path, calculates the resistance R of measured resistance
x,
Secondly, the resistance R of measured resistance is eliminated by double current method
xon interference voltages, obtain and eliminate the resistance R of measured resistance after interference
x.
Present embodiment adopts voltage ratio method to eliminate the output voltage E of controllable direct current power supply to the impact of measured resistance measuring accuracy, the resistance R of fixed value resistance
xknown, for demarcating the resistance R of measured resistance
x, adjustable current-limiting resistance is used for the size of control survey electric current I.
The described resistance calculating measured resistance, its detailed process is, according to formula
calculate the resistance R obtaining measured resistance
x.
Described formula
r
0according to formula
Derivation obtains.
The described resistance R being eliminated measured resistance by double current method
xon interference voltages, obtain and eliminate the resistance R of measured resistance after interference
x, its detailed process is as follows:
The output voltage arranging controllable direct current power supply is respectively E
1and E
2, and E
1be greater than E
2,
When the output voltage of controllable direct current power supply is E
1, electric current corresponding to this series connection closed-loop path is I
1, the voltage measuring fixed value resistance two ends obtains measuring voltage U
11, the voltage measuring measured resistance two ends obtains measuring voltage U
21,
When the output voltage of controllable direct current power supply is E
2, electric current corresponding to this series connection closed-loop path is I
2, the voltage measuring fixed value resistance two ends obtains measuring voltage U
12, the voltage measuring measured resistance two ends obtains measuring voltage U
22, according to formula
calculate the resistance R obtaining and eliminate the rear measured resistance of interference
x.
The resistance R being eliminated measured resistance by double current method described in present embodiment
xon interference voltages, obtain and eliminate the resistance R of measured resistance after interference
xprinciple be:
When the output voltage of controllable direct current power supply is E
1, electric current corresponding to this series connection closed-loop path is I
1, the voltage measuring fixed value resistance two ends obtains measuring voltage U
11, the voltage acquisition measuring voltage measuring measured resistance two ends is U
21,
Then have, U
11=U
01+ E
s1(3),
U
21=U
x1+E
s2（4），
Wherein, U
01for the virtual voltage at fixed value resistance two ends, U
x1for the virtual voltage at measured resistance two ends, E
s1for measuring voltage U
11on interference voltages, E
s2for measuring voltage U
21on interference voltages;
When the output voltage of controllable direct current power supply is E
2, electric current corresponding to this series connection closed-loop path is I
2, the voltage measuring fixed value resistance two ends obtains measuring voltage U
12, the voltage measuring measured resistance 1 two ends obtains measuring voltage U
22,
Then have, U
12=U
02+ E
s3(5),
U
22=U
x2+E
s4（6），
Wherein, U
02for the virtual voltage at fixed value resistance two ends, U
x2for the virtual voltage at measured resistance two ends, E
s3for measuring voltage U
12on interference voltages, E
s4for measuring voltage U
22on interference voltages;
Wherein, E
s1=E
s3, E
s2=E
s4;
Calculated by formula (3), (4), (5) and (6), U
11-U
12=U
01-U
02=R
0(I
1-I
2) (7),
U
21-U
22=U
X1-U
X2=R
x(I
1-I
2)（8），
Arrangement formula (7) and formula (8) obtain,
From formula
in can draw, adopt double current method eliminate interference voltages on the impact of measuring accuracy.
Described electric current I
1and I
2pulsewidth identical, be 1 second.
Described electric current I
1amplitude be 1A.
Described electric current I
2amplitude be 5A.
Described electric current I
1and I
2export continuously alternately, the cycle of constituting is the periodic current of 2 seconds.
Realize a kind of measuring system of the micro-resistance high-precision measuring method based on double-current voltage ratio method, described measuring system comprises measured resistance, fixed value resistance, adjustable current-limiting resistance, controllable electric power, filter amplifier, A/D converter, Single Chip Microcomputer (SCM) system, display and operation keyboard, one end ground connection of described measured resistance, the other end of measured resistance is connected with one end of fixed value resistance, the other end of this fixed value resistance is connected with one end of adjustable current-limiting resistance, the other end of adjustable current-limiting resistance is connected with the positive source output terminal of controllable electric power, the power cathode input end of controllable electric power is connected with the voltage control signal output terminal of Single Chip Microcomputer (SCM) system, four-wire ohm measuring method is adopted to gather the terminal voltage signal of fixed value resistance, and this voltage signal is sent to filter amplifier, adopt four-wire ohm measuring method to gather the terminal voltage signal of measured resistance, and this voltage signal is sent to filter amplifier, the signal output part of filter amplifier is connected with the input end of analog signal of A/D converter, the digital signal output end of described A/D converter is connected with the collection signal input end of Single Chip Microcomputer (SCM) system, the display output terminal of described Single Chip Microcomputer (SCM) system is connected with the signal input part of display, and described operation keyboard signal output part is connected with the signal input part of Single Chip Microcomputer (SCM) system.
The beneficial effect that a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method of the present invention and the measuring system realizing the method are brought is: adopt voltage ratio method to eliminate power supply to the impact of measuring accuracy, double current method is adopted to eliminate DC influence to the impact of measuring accuracy, it has the advantages that antijamming capability is strong and measurement is accurately high, its antijamming capability improves more than 30%, and accuracy of measurement can reach 0.1 micro-ohm level.
Accompanying drawing explanation
Fig. 1 is a kind of described in embodiment one equivalent circuit diagram of the micro-resistance high-precision measuring method based on double-current voltage ratio method.
Fig. 2 is in embodiment three, when the output voltage of controllable direct current power supply is E
1time, the equivalent circuit diagram of described a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method.
Fig. 3 is for realizing the theory diagram of the measuring system of a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method described in embodiment one.
Embodiment
Embodiment one: a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method described in present embodiment, detailed process is as follows, first, power supply outgoing side measured resistance 1, fixed value resistance 2 and adjustable current-limiting resistance 3 being connected on controllable direct current power supply forms series connection closed-loop path, the output voltage of described controllable direct current power supply is E, and the resistance of measured resistance 1 is R
x, the resistance of fixed value resistance 2 is R
0, the resistance of adjustable current-limiting resistance 3 is R
1, adopt four-wire ohm measuring method to measure the measuring voltage U obtaining fixed value resistance 2 two ends
1, measured resistance 1 two ends measuring voltage U
2electric current I with series connection closed-loop path, calculates the resistance R of measured resistance 1
x,
Secondly, the resistance R of measured resistance 1 is eliminated by double current method
xon interference voltages, obtain and eliminate the resistance R of measured resistance 1 after interference
x.
Present embodiment adopts voltage ratio method to eliminate the output voltage E of controllable direct current power supply to the impact of measured resistance 1 measuring accuracy, the resistance R of fixed value resistance 2
xknown, for demarcating the resistance R of measured resistance 1
x, adjustable current-limiting resistance 3 is for the size of control survey electric current I.
Embodiment two: present embodiment is described see Fig. 1, the difference of present embodiment and a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method described in embodiment one is, the described resistance calculating measured resistance 1, its detailed process is, according to formula
calculate the resistance R obtaining measured resistance 1
x.
Described formula
r
0according to formula
Derivation obtains.
Embodiment three: present embodiment is described see Fig. 2, the difference of present embodiment and a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method described in embodiment one is, the described resistance R being eliminated measured resistance 1 by double current method
xon interference voltages, obtain and eliminate the resistance R of measured resistance 1 after interference
x, its detailed process is as follows:
The output voltage arranging controllable direct current power supply is respectively E
1and E
2, and E
1be greater than E
2,
When the output voltage of controllable direct current power supply is E
1, electric current corresponding to this series connection closed-loop path is I
1, the voltage measuring fixed value resistance 2 two ends obtains measuring voltage U
11, the voltage measuring measured resistance 1 two ends obtains measuring voltage U
21,
When the output voltage of controllable direct current power supply is E
2, electric current corresponding to this series connection closed-loop path is I
2, the voltage measuring fixed value resistance 2 two ends obtains measuring voltage U
12, the voltage measuring measured resistance 1 two ends obtains measuring voltage U
22, according to formula
calculate the resistance R obtaining and eliminate the rear measured resistance 1 of interference
x.
The resistance R being eliminated measured resistance 1 by double current method described in present embodiment
xon interference voltages, obtain and eliminate the resistance R of measured resistance 1 after interference
xprinciple be:
When the output voltage of controllable direct current power supply is E
1, electric current corresponding to this series connection closed-loop path is I
1, the voltage measuring fixed value resistance 2 two ends obtains measuring voltage U
11, the voltage acquisition measuring voltage measuring measured resistance 1 two ends is U
21,
Then have, U
11=U
01+ E
s1(3),
U
21=U
x1+E
s2（4），
Wherein, U
01for the virtual voltage at fixed value resistance 2 two ends, U
x1for the virtual voltage at measured resistance 1 two ends, E
s1for measuring voltage U
11on interference voltages, E
s2for measuring voltage U
21on interference voltages;
When the output voltage of controllable direct current power supply is E
2, electric current corresponding to this series connection closed-loop path is I
2, the voltage measuring fixed value resistance 2 two ends obtains measuring voltage U
12, the voltage measuring measured resistance 1 two ends obtains measuring voltage U
22,
Then have, U
12=U
02+ E
s3(5),
U
22=U
x2+E
s4（6），
Wherein, U
02for the virtual voltage at fixed value resistance 2 two ends, U
x2for the virtual voltage at measured resistance 2 two ends, E
s3for measuring voltage U
12on interference voltages, E
s4for measuring voltage U
22on interference voltages;
Wherein, E
s1=E
s3, E
s2=E
s4;
Calculated by formula (3), (4), (5) and (6), U
11-U
12=U
01-U
02=R
0(I
1-I
2) (7),
U
21-U
22=U
X1-U
X2=R
x(I
1-I
2)（8），
Arrangement formula (7) and formula (8) obtain,
From formula
in can draw, adopt double current method eliminate interference voltages on the impact of measuring accuracy.
Embodiment four: present embodiment is described see Fig. 2, the difference of present embodiment and a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method described in embodiment three is, described electric current I
1and I
2pulsewidth identical, be 1 second.
Embodiment five: present embodiment is described see Fig. 2, the difference of present embodiment and a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method described in embodiment three is, described electric current I
1amplitude be 1A.
Embodiment six: present embodiment is described see Fig. 2, the difference of present embodiment and a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method described in embodiment three is, described electric current I
2amplitude be 5A.
Embodiment seven: present embodiment is described see Fig. 2, the difference of present embodiment and a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method described in embodiment three is, described electric current I
1and I
2export continuously alternately, the cycle of constituting is the periodic current of 2 seconds.
Embodiment eight: present embodiment is described see Fig. 3, present embodiment realizes the measuring system of a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method described in embodiment one, described measuring system comprises measured resistance 1, fixed value resistance 2, adjustable current-limiting resistance 3, controllable electric power 9, filter amplifier 4, A/D converter 5, Single Chip Microcomputer (SCM) system 6, display 7 and operation keyboard 8, one end ground connection of described measured resistance 1, the other end of measured resistance 1 is connected with one end of fixed value resistance 2, the other end of this fixed value resistance 2 is connected with one end of adjustable current-limiting resistance 3, the other end of adjustable current-limiting resistance 3 is connected with the positive source output terminal of controllable electric power 9, the power cathode input end of controllable electric power 9 is connected with the voltage control signal output terminal of Single Chip Microcomputer (SCM) system 6, four-wire ohm measuring method is adopted to gather the terminal voltage signal of fixed value resistance 2, and this voltage signal is sent to filter amplifier 4, adopt four-wire ohm measuring method to gather the terminal voltage signal of measured resistance 1, and this voltage signal is sent to filter amplifier 4, the signal output part of filter amplifier 4 is connected with the input end of analog signal of A/D converter 5, the digital signal output end of described A/D converter 5 is connected with the collection signal input end of Single Chip Microcomputer (SCM) system 6, the display output terminal of described Single Chip Microcomputer (SCM) system 6 is connected with the signal input part of display 7, and described operation keyboard 8 signal output part is connected with the signal input part of Single Chip Microcomputer (SCM) system 6.
Claims (3)
1. the micro-resistance high-precision measuring method based on double-current voltage ratio method, it is characterized in that, detailed process is as follows, first, power supply outgoing side measured resistance (1), fixed value resistance (2) and adjustable current-limiting resistance (3) being connected on controllable direct current power supply forms series connection closed-loop path, the output voltage of described controllable direct current power supply is E, and the resistance of measured resistance (1) is R
x, the resistance of fixed value resistance (2) is R
0, the resistance of adjustable current-limiting resistance (3) is R
1, adopt four-wire ohm measuring method to measure the measuring voltage U obtaining fixed value resistance (2) two ends
1, measured resistance (1) two ends measuring voltage U
2electric current I with series connection closed-loop path, calculates the resistance R of measured resistance (1)
x,
Secondly, the resistance R of measured resistance (1) is eliminated by double current method
xon interference voltages, obtain and eliminate the resistance R of measured resistance (1) after interference
x ';
The described resistance R being eliminated measured resistance (1) by double current method
xon interference voltages, obtain and eliminate the resistance R of measured resistance (1) after interference
x ', its detailed process is as follows:
The output voltage arranging controllable direct current power supply is respectively E
1and E
2, and E
1be greater than E
2,
When the output voltage of controllable direct current power supply is E
1, electric current corresponding to this series connection closed-loop path is I
1, the voltage measuring fixed value resistance (2) two ends obtains measuring voltage U
11, the voltage measuring measured resistance (1) two ends obtains measuring voltage U
21,
When the output voltage of controllable direct current power supply is E
2, electric current corresponding to this series connection closed-loop path is I
2, the voltage measuring fixed value resistance (2) two ends obtains measuring voltage U
12, the voltage measuring measured resistance (1) two ends obtains measuring voltage U
22, according to formula
calculate the resistance R obtaining and eliminate the rear measured resistance (1) of interference
x ';
Described electric current I
1and I
2pulsewidth identical, be 1 second;
Described electric current I
1amplitude be 1A;
Described electric current I
2amplitude be 5A;
Electric current I
1and I
2export continuously alternately, the cycle of constituting is the periodic current of 2 seconds.
2. a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method according to claim 1, it is characterized in that, the described resistance calculating measured resistance (1), its detailed process is, according to formula
calculate the resistance R obtaining measured resistance (1)
x.
3. realize the measuring system of a kind of micro-resistance high-precision measuring method based on double-current voltage ratio method according to claim 1, it is characterized in that, described measuring system comprises measured resistance (1), fixed value resistance (2), adjustable current-limiting resistance (3), controllable electric power (9), filter amplifier (4), A/D converter (5), Single Chip Microcomputer (SCM) system (6), display (7) and operation keyboard (8), one end ground connection of described measured resistance (1), the other end of measured resistance (1) is connected with one end of fixed value resistance (2), the other end of this fixed value resistance (2) is connected with one end of adjustable current-limiting resistance (3), the other end of adjustable current-limiting resistance (3) is connected with the positive source output terminal of controllable electric power (9), the power cathode input end of controllable electric power (9) is connected with the voltage control signal output terminal of Single Chip Microcomputer (SCM) system (6), four-wire ohm measuring method is adopted to gather the terminal voltage signal of fixed value resistance (2), and this voltage signal is sent to filter amplifier (4), adopt four-wire ohm measuring method to gather the terminal voltage signal of measured resistance (1), and this voltage signal is sent to filter amplifier (4), the signal output part of filter amplifier (4) is connected with the input end of analog signal of A/D converter (5), the digital signal output end of described A/D converter (5) is connected with the collection signal input end of Single Chip Microcomputer (SCM) system (6), the display output terminal of described Single Chip Microcomputer (SCM) system (6) is connected with the signal input part of display (7), and described operation keyboard (8) signal output part is connected with the signal input part of Single Chip Microcomputer (SCM) system (6).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103412191B (en) * | 2013-08-26 | 2015-07-01 | 甘肃农业大学 | Minitype resistance measurement system |
| CN105021944B (en) * | 2015-07-17 | 2018-01-16 | 上海斐讯数据通信技术有限公司 | A kind of low resistance connectivity testing device and method |
| CN106645955A (en) * | 2016-09-20 | 2017-05-10 | 青岛时创智能技术有限公司 | Test circuit for measuring relay contact ultralow impedance |
| CN106291066B (en) * | 2016-10-31 | 2019-02-05 | 西安交通大学 | A kind of DC high voltage measurement and correction system and method based on divider time sharing sampling |
| CN108152592B (en) * | 2017-12-27 | 2020-04-03 | 北京航天测控技术有限公司 | Lead impedance measurement system |
| CN109854414B (en) * | 2018-12-11 | 2021-05-04 | 西安航天动力测控技术研究所 | Safety ignition mechanism unit tester |
| CN111830322B (en) * | 2020-05-28 | 2022-12-16 | 江苏省送变电有限公司 | GIL conductor electric connection state evaluation device |
| CN112327057A (en) * | 2020-12-03 | 2021-02-05 | 常州同惠电子股份有限公司 | On-resistance testing method for wire tester |
| CN113589046A (en) * | 2021-09-06 | 2021-11-02 | 天津津航计算技术研究所 | High-precision resistance signal acquisition circuit applied to aviation electromechanical products |
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