CN101887092A - Resistance measurement method with wide temperature range, wide measurement range, high precision and low cost - Google Patents
Resistance measurement method with wide temperature range, wide measurement range, high precision and low cost Download PDFInfo
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- CN101887092A CN101887092A CN 201010211613 CN201010211613A CN101887092A CN 101887092 A CN101887092 A CN 101887092A CN 201010211613 CN201010211613 CN 201010211613 CN 201010211613 A CN201010211613 A CN 201010211613A CN 101887092 A CN101887092 A CN 101887092A
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Abstract
The invention relates to a resistance measurement method with wide temperature range, wide measurement range, high precision and low cost, which adopts a signal acquisition module and a measurement processing module. The signal acquisition module respectively samples a forward voltage and a backward voltage at two ends of a measured resistance Rx and the forward voltage and the backward voltage at two ends of a standard resistance Rs under the control of a switching control signal sent by the measurement processing module, and sends the sampled voltages to the measurement processing module for processing; and the measurement processing module measures four acquired voltage signals sent by the signal acquisition module and completes calculation of the measured resistance value. The resistance measurement method of the invention improves the measurement method and achieves high-precision and low-cost resistance measurement.
Description
Technical field
The present invention relates to a kind of measuring method of resistance, especially a kind of test environment range of temperature is big, carry out the resistance measurement method of high-precision low cost under the condition of measured resistance value wider range.
Background technology
The measuring method of resistance mainly contains multimeter mensuration, four-wire system constant flow method, constant voltage method of testing and big impulse current measurement method etc. at present.The multimeter mensuration adopts two-wire system to measure, and measured resistance is connected with test lead, and slotted line resistance and contact resistance just can not be left in the basket when measured resistance is smaller; The four-wire system constant flow method can be got rid of the influence to measurement result of test lead resistance and contact resistance, but measuring accuracy depends on the stability of constant current source, measuring current required when particularly high value is measured is very little, be subjected to the influence of variation of ambient temperature to be difficult to keep stable, so this method only is fit to the high-acruracy survey to low resistance and middle resistance; The constant voltage method of testing can produce very big electric current when measuring small resistor, cause the measured resistance self-heating to cause change in resistance and reduce measuring accuracy, so be not suitable for the measurement of low resistance; Big impulse current measurement method can be controlled the average current that flows through measured resistance, the problem that reduces the measured resistance self-heating and cause, but owing to flow through the electric current of measured device is a pulsating current, and this method only is suitable for the measurement of pure resistance, is not suitable for the test to perceptual device; In addition, the general mode that applies direct current signal that adopts of resistance is measured, and have imbalance in the DC channel inevitably, and it is quite responsive to environment temperature to lack of proper care, and can only use expensive device or adopt complicated temperature compensation measure in order to improve measuring accuracy.
Summary of the invention
The technical problem to be solved in the present invention is: the resistance measurement method that proposes a kind of wide temperature wide-range high-precision low cost.
The technical solution adopted in the present invention is: a kind of resistance measurement method of wide temperature wide-range high-precision low cost, comprise signal acquisition module and measurement process module, described signal acquisition module comprises test voltage source Es, current-limiting resistance Ro, four line measuring junctions, amplifier, current drives, measuring resistance Rs, change-over switch and measured resistance Rx; Measurement process module comprises signal condition, AD conversion, keyboard and demonstration and main control unit, signal acquisition module under the control of switch controlling signal that measurement process module is sent, sample respectively measured resistance Rx two ends forward voltage, reverse voltage, measuring resistance Rs two ends forward voltage, reverse voltage and send measurement process module to handle; The calculating of measured resistance value is measured and finished to four collection voltage signals that measurement process module is sent into signal acquisition module.
Further specifically, test voltage source Es and the HD terminal that is connected to four line measuring junctions after current-limiting resistance Ro connects in the signal acquisition module of the present invention, the LD end of four line measuring junctions is connected to "-" end of amplifier and the end of measuring resistance Rs simultaneously, connect a current driver between the other end of measuring resistance Rs and the output terminal of amplifier, "+" end of amplifier links to each other with ground, measured resistance Rx is connected across the high-end HD of four line measuring junctions, HS and low side LS, between the LD, four line measuring junction HS, the two ends of the two ends of LS and measuring resistance Rs are connected respectively to the Vx1 of change-over switch, Vx2, Vs1, four input ends of Vs2, the switch controlling signal end of change-over switch links to each other with the main control unit in the measurement process module, and the voltage signal U1 of change-over switch output partly links to each other with the signal condition in the measurement process module.
Further, the resistance measurement method of the present invention's proposition is to finish one-shot measurement by following 5 steps:
(1) main control unit sends switch controlling signal and makes change-over switch select forward voltage signal U1 between Vx1 and the Vx2 two ends, it is sent to the signal condition section processes, and is converted to measurement result Ud1 by AD;
(2) main control unit sends switch controlling signal and makes change-over switch select reverse voltage signal U1 between Vx2 and the Vx1 two ends, it is sent to the signal condition section processes, and is converted to measurement result Ud2 by AD;
(3) main control unit sends switch controlling signal and makes change-over switch select forward voltage signal U1 between Vs1 and the Vs2 two ends, it is sent to the signal condition section processes, and is converted to measurement result Ud3 by AD;
(4) main control unit sends switch controlling signal and makes change-over switch select reverse voltage signal U1 between Vs2 and the Vs1 two ends, it is sent to the signal condition section processes, and is converted to measurement result Ud4 by AD;
(5) main control unit utilizes formula Rx=(Ud1-Ud2)/(Ud3-Ud4) * Rs to calculate measured resistance.
The invention has the beneficial effects as follows: 1, the voltage signal of measured device and current signal sampling in turn, reduced requirement to the test voltage source, improved the stability of measurement result; 2, adopt the forward and reverse measurement simultaneously of signal, can effectively eliminate the influence that causes the variation of metering circuit parameter that measurement result is produced because of variation of ambient temperature; 3, can come measuring resistance with less measuring current, reduce measured resistance self-heating problem, improve measuring accuracy; 4, can adopt low-cost device to realize high-acruracy survey.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a structural representation block scheme of the present invention;
Fig. 2 is a signal acquisition module fundamental diagram of the present invention;
Fig. 3 is a measurement process module principle schematic of the present invention;
Among the figure: 1, signal acquisition module; 2, measurement process module.
Embodiment
The present invention is further detailed explanation with preferred embodiment in conjunction with the accompanying drawings now.These accompanying drawings are the synoptic diagram of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
The framework of the resistance measurement method of a kind of wide temperature wide-range high-precision low cost as shown in Figure 1 comprises signal acquisition module and measurement process module.Wherein signal acquisition module under the control of switch controlling signal that measurement process module is sent, sample respectively measured resistance Rx two ends forward voltage, reverse voltage, measuring resistance Rs two ends forward voltage, reverse voltage and send measurement process module to handle; The calculating of measured resistance value is measured and finished to four collection voltage signals that measurement process module is sent into signal acquisition module.
Signal acquisition module fundamental diagram of the present invention is as shown in Figure 2:
Measured resistance two ends forward voltage+Ux=Vx1-Vx2=Ix * Rx (1)
Measured resistance two ends forward voltage-Ux=Vx2-Vx1=-Ix * Rx (2)
Measured resistance two ends forward voltage+Us=Vs1-Vs2 ≈ Ix * Rs (3)
Measured resistance two ends forward voltage-Us=Vs2-Vs1 ≈-Ix * Rs (4)
Under the effect of switch controlling signal, send above-mentioned four voltage sample output signal U 1 in turn by change-over switch.Current-limiting resistance Ro among Fig. 2 can limit the maximum measuring current that allows, and reduces measured resistance self-heating problem; Standard resistance range according to measured resistance Rx can be realized the wide-range measurement by the different measuring resistance Rs of main control unit control access; Short for the void that guarantees amplifier, empty disconnected characteristic has increased the current drives part to improve the driving force of amplifier between the output terminal of amplifier and measuring resistance Rs.
And measurement process module 2 comprises signal condition, AD conversion, keyboard and parts such as demonstration and main control unit, as shown in Figure 3:
Four voltage sample output signal U 1 that the signal condition part is sent signal acquisition module 1 here under the control of main control unit are carried out suitable processing and amplifying, to satisfy the required voltage amplitude of AD conversion portion, are used to improve measuring accuracy; The AD conversion portion obtains four voltage measuring values after changing under the coordination control of main control unit, be respectively:
Ud1＝(+Ux×K1+ΔU1)/Er1(5)
Ud2＝(-Ux×K2+ΔU2)/Er2(6)
Ud3＝(+Us×K3+ΔU3)/Er3(7)
Ud4＝(-Us×K4+ΔU4)/Er4(8)
Wherein: K1～K4 is respectively the full gain of whole measurement passage when measuring four voltage sample output signals, it comprises the gain of signal condition part and AD conversion portion, because of four same measurement passage processing of measuring-signals process, as long as guarantee to measure in the short time relatively stable, they are respectively total imbalance of measuring four whole measurement passages of voltage sample output signal like equal delta U1～Δ U4 nearby, it comprises the gain of signal condition part and AD conversion portion, in like manner, their also approximately equals during the measurement; Er1～Er4 is respectively the reference voltage that offers AD when measuring four voltage sample output signals, in like manner, and their also approximately equals during the measurement.Separate by the system of equations that above-mentioned formula (1)～(8) obtain, be not difficult to obtain following formula:
Rx＝(Ud1-Ud2)/(Ud3-Ud4)×Rs (9)
Obviously, the measurement result of measured resistance Rx is only relevant with four voltage measuring value Ud1～Ud4 and measuring resistance Rs, and it is irrelevant with other parameter of circuit, always lacked of proper care by the circuit full gain and the circuit of temperature variation sensitivity, so can use low-cost device to realize high-precision resistance measurement.In addition, measured resistance Rx and test voltage source Es, current-limiting resistance Ro are irrelevant as can be known to utilize formula (9), so can adopt less measuring current Ix to come measuring resistance, reduce measured resistance self-heating problem, improve measuring accuracy.
Just the specific embodiment of the present invention of describing in the above instructions, various not illustrating is construed as limiting flesh and blood of the present invention, the person of an ordinary skill in the technical field after having read instructions can to before described embodiment make an amendment or be out of shape, and do not deviate from essence of an invention and scope.
Claims (3)
1. the resistance measurement method of one kind wide temperature wide-range high-precision low cost, comprise signal acquisition module (1) and measurement process module (2), it is characterized in that: described signal acquisition module (1) comprises test voltage source Es, current-limiting resistance Ro, four line measuring junctions, amplifier, current drives, measuring resistance Rs, change-over switch and measured resistance Rx; Measurement process module (2) comprises signal condition, AD conversion, keyboard and demonstration and main control unit, signal acquisition module (1) under the control of switch controlling signal that measurement process module (2) is sent, sample respectively measured resistance Rx two ends forward voltage, reverse voltage, measuring resistance Rs two ends forward voltage, reverse voltage and send measurement process module (2) to handle; The calculating of measured resistance value is measured and finished to four collection voltage signals that measurement process module (2) is sent into signal acquisition module (1).
2. the resistance measurement method of wide temperature wide-range high-precision low cost as claimed in claim 1, it is characterized in that: test voltage source Es and the HD terminal that is connected to four line measuring junctions after current-limiting resistance Ro connects in the described signal acquisition module (1), the LD end of four line measuring junctions is connected to "-" end of amplifier and the end of measuring resistance Rs simultaneously, connect a current driver between the other end of measuring resistance Rs and the output terminal of amplifier, "+" end of amplifier links to each other with ground, measured resistance Rx is connected across the high-end HD of four line measuring junctions, HS and low side LS, between the LD, four line measuring junction HS, the two ends of the two ends of LS and measuring resistance Rs are connected respectively to the Vx1 of change-over switch, Vx2, Vs1, four input ends of Vs2, the switch controlling signal end of change-over switch links to each other with main control unit in the measurement process module (2), and the voltage signal U1 of change-over switch output partly links to each other with the signal condition in the measurement process module (2).
3. the resistance measurement method of wide temperature wide-range high-precision low cost as claimed in claim 1, it is characterized in that: described measurement process module (2) is finished a resistance measurement by 5 steps: the 1st step was that main control unit sends switch controlling signal and makes change-over switch select forward voltage signal U1 between Vx1 and the Vx2 two ends, it is sent to the signal condition section processes, and is converted to measurement result Ud1 by AD; The 2nd step was that main control unit sends switch controlling signal and makes change-over switch select reverse voltage signal U1 between Vx2 and the Vx1 two ends, it is sent to the signal condition section processes, and is converted to measurement result Ud2 by AD; The 3rd step was that main control unit sends switch controlling signal and makes change-over switch select forward voltage signal U1 between Vs1 and the Vs2 two ends, it is sent to the signal condition section processes, and is converted to measurement result Ud3 by AD; The 4th step was that main control unit sends switch controlling signal and makes change-over switch select reverse voltage signal U1 between Vs2 and the Vs1 two ends, it is sent to the signal condition section processes, and is converted to measurement result Ud4 by AD; The 5th step was that main control unit utilizes formula Rx=(Ud1-Ud2)/(Ud3-Ud4) * Rs to calculate measured resistance.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262176A (en) * | 2011-06-16 | 2011-11-30 | 深圳市科陆电子科技股份有限公司 | Method for measuring channel data of feeder terminal unit of power system |
| CN103235189A (en) * | 2013-04-28 | 2013-08-07 | 哈尔滨理工大学 | High-precision micro resistor measurement method based on double-current voltage ratio method and measurement system for realizing method |
| CN103675461A (en) * | 2013-12-20 | 2014-03-26 | 北京航天测控技术有限公司 | Resistance measurement method and device based on adjustable current source |
| CN104422852A (en) * | 2013-08-27 | 2015-03-18 | 中国船舶重工集团公司第七研究院 | Superconducting magnet coil interturn insulation detecting device and method |
| CN104535843A (en) * | 2015-01-14 | 2015-04-22 | 秦辉 | Intelligent direct current stabilized power supply internal resistance measuring device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006109896A1 (en) * | 2005-04-11 | 2006-10-19 | In Kye Choe | Converter for resistive sensors of high sensitivity |
| CN101498749A (en) * | 2008-02-01 | 2009-08-05 | 凯迈（洛阳）测控有限公司 | Accurate resistor measuring apparatus and method thereof |
| CN201335870Y (en) * | 2008-12-10 | 2009-10-28 | 河南电力试验研究院 | DC circuit fault detection system |
-
2010
- 2010-06-25 CN CN 201010211613 patent/CN101887092A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006109896A1 (en) * | 2005-04-11 | 2006-10-19 | In Kye Choe | Converter for resistive sensors of high sensitivity |
| CN101498749A (en) * | 2008-02-01 | 2009-08-05 | 凯迈（洛阳）测控有限公司 | Accurate resistor measuring apparatus and method thereof |
| CN201335870Y (en) * | 2008-12-10 | 2009-10-28 | 河南电力试验研究院 | DC circuit fault detection system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262176A (en) * | 2011-06-16 | 2011-11-30 | 深圳市科陆电子科技股份有限公司 | Method for measuring channel data of feeder terminal unit of power system |
| CN103235189A (en) * | 2013-04-28 | 2013-08-07 | 哈尔滨理工大学 | High-precision micro resistor measurement method based on double-current voltage ratio method and measurement system for realizing method |
| CN103235189B (en) * | 2013-04-28 | 2015-12-02 | 哈尔滨理工大学 | A kind of micro-resistance high-precision measuring method based on double-current voltage ratio method and realize the measuring system of the method |
| CN104422852A (en) * | 2013-08-27 | 2015-03-18 | 中国船舶重工集团公司第七研究院 | Superconducting magnet coil interturn insulation detecting device and method |
| CN103675461A (en) * | 2013-12-20 | 2014-03-26 | 北京航天测控技术有限公司 | Resistance measurement method and device based on adjustable current source |
| CN103675461B (en) * | 2013-12-20 | 2016-03-30 | 北京航天测控技术有限公司 | Based on the resistance measurement method of adjustable current source |
| CN104535843A (en) * | 2015-01-14 | 2015-04-22 | 秦辉 | Intelligent direct current stabilized power supply internal resistance measuring device |
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Application publication date: 20101117 |