CN201945637U - Resistance tester with wide temperature range, wide measuring range, high precision and low cost - Google Patents
Resistance tester with wide temperature range, wide measuring range, high precision and low cost Download PDFInfo
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- CN201945637U CN201945637U CN2010206939881U CN201020693988U CN201945637U CN 201945637 U CN201945637 U CN 201945637U CN 2010206939881 U CN2010206939881 U CN 2010206939881U CN 201020693988 U CN201020693988 U CN 201020693988U CN 201945637 U CN201945637 U CN 201945637U
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Abstract
The utility model relates to a resistance tester with wide temperature range, wide measuring range, high precision and low cost, which comprises a signal acquiring module and a measurement processing module, wherein the signal acquiring module samples forward voltage and backward voltage of two ends of a measured resistor Rx as well as forward voltage and backward voltage of two ends of a standard resistor Rs respectively under the control of a switch controlling signal sent by the measurement processing module and sends the forward voltage and the backward voltage of the two ends of the measured resistor Rx as well as the forward voltage and the backward voltage of the two ends of the standard resistor Rs to the measurement processing module to process; and the measurement processing module measures four acquired voltage signals sent by the signal acquiring module and finishes the calculation of the measured resistance values. The utility model improves the measuring method, and the resistance testing with high precision and low cost can be implemented.
Description
Technical field
The utility model relates to a kind of measuring instrument of resistance, and especially a kind of test environment range of temperature is big, carry out the resistance measuring instrument 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.
The utility model content
The technical problems to be solved in the utility model is: the resistance measuring instrument that proposes a kind of wide temperature wide-range high-precision low cost.
The technical scheme that the utility model adopted is: a kind of resistance measuring instrument 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, and the output terminal of described signal acquisition module connects the input end of measurement process 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 described in the utility model, 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.
The resistance measurement method that the utility model proposes 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 beneficial effects of the utility model are: 1, the voltage signal of measured device and current signal sampling in turn, reduced requirement to the test voltage source, and 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
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a structural representation block scheme of the present utility model;
Fig. 2 is a signal acquisition module fundamental diagram of the present utility model;
Fig. 3 is a measurement process module principle schematic of the present utility model.
Among the figure: 1, signal acquisition module; 2, measurement process module.
Embodiment
With preferred embodiment the utility model is described in further detail in conjunction with the accompanying drawings now.These accompanying drawings are the synoptic diagram of simplification, basic structure of the present utility model only is described in a schematic way, so it only show the formation relevant with the utility model.
The resistance measuring instrument 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 described in the utility model 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 stablely, they are patibhaga-nimitta etc. nearby; Δ U1～Δ U4 is respectively total imbalance of measuring four whole measurement passages of voltage sample output signal, and it comprises the gain of signal condition part and AD conversion portion, in like manner, and 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.
What describe in the above instructions is embodiment of the present utility model, various not illustrating is construed as limiting flesh and blood of the present utility model, 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 (2)
1. the resistance measuring instrument 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, and the output terminal of described signal acquisition module (1) connects the input end of measurement process module (2).
2. the resistance measuring instrument 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206939881U CN201945637U (en) | 2010-12-31 | 2010-12-31 | Resistance tester with wide temperature range, wide measuring range, high precision and low cost |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206939881U CN201945637U (en) | 2010-12-31 | 2010-12-31 | Resistance tester with wide temperature range, wide measuring range, high precision and low cost |
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| Publication Number | Publication Date |
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| CN201945637U true CN201945637U (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206939881U Expired - Fee Related CN201945637U (en) | 2010-12-31 | 2010-12-31 | Resistance tester with wide temperature range, wide measuring range, high precision and low cost |
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| CN (1) | CN201945637U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445252A (en) * | 2011-12-10 | 2012-05-09 | 河南科技大学 | Resistor type water-level digital sensor |
| CN102854386A (en) * | 2012-08-02 | 2013-01-02 | 深圳市明微电子股份有限公司 | Resistance test method |
| CN104991123A (en) * | 2015-04-27 | 2015-10-21 | 西安航空学院 | High temperature in-situ resistance measurement instrument with synchronous rapid water quenching function, and measurement method thereof |
| CN108693405A (en) * | 2017-04-07 | 2018-10-23 | 北京航天计量测试技术研究所 | A kind of two line test devices and method eliminated multichannel switching circuit and influenced |
-
2010
- 2010-12-31 CN CN2010206939881U patent/CN201945637U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445252A (en) * | 2011-12-10 | 2012-05-09 | 河南科技大学 | Resistor type water-level digital sensor |
| CN102854386A (en) * | 2012-08-02 | 2013-01-02 | 深圳市明微电子股份有限公司 | Resistance test method |
| CN102854386B (en) * | 2012-08-02 | 2015-08-05 | 深圳市明微电子股份有限公司 | A kind of method for testing resistance |
| CN104991123A (en) * | 2015-04-27 | 2015-10-21 | 西安航空学院 | High temperature in-situ resistance measurement instrument with synchronous rapid water quenching function, and measurement method thereof |
| CN108693405A (en) * | 2017-04-07 | 2018-10-23 | 北京航天计量测试技术研究所 | A kind of two line test devices and method eliminated multichannel switching circuit and influenced |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20131231 |