CN105588967A - Wheatstone bridge for multi-core cable on-state resistance measurement - Google Patents
Wheatstone bridge for multi-core cable on-state resistance measurement Download PDFInfo
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- CN105588967A CN105588967A CN201410552759.0A CN201410552759A CN105588967A CN 105588967 A CN105588967 A CN 105588967A CN 201410552759 A CN201410552759 A CN 201410552759A CN 105588967 A CN105588967 A CN 105588967A
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- operational amplifier
- wheatstone bridge
- resistance measurement
- power supply
- brachium pontis
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- Measurement Of Resistance Or Impedance (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a Wheatstone bridge for multi-core cable on-state resistance measurement, which comprises four bridge arm resistors forming the Wheatstone bridge, wherein the middle nodes of the first bridge arm and the second bridge arm are respectively connected with a first operational amplifier and a second operational amplifier; the middle node of the first bridge arm is also connected with a sliding contact of a sliding resistor connected between a power supply and the ground; the top end of the first bridge arm is directly connected with the power supply; the top end of the second bridge arm is connected with the power supply via an adjustment resistor; and the output ends of the first operational amplifier and the second operational amplifier are respectively connected with the reverse phase input end and the positive phase input end of the third operational amplifier. According to the Wheatstone bridge for multi-core cable on-state resistance measurement, two arms of the Wheatstone bridge react to tiny changes of the power supply at the same time, outputted signals are fed in a differential amplifier, common mode interference is thus eliminated, and the measurement accuracy is improved.
Description
Technical field
The present invention relates to electronic circuit field, particularly, relate to a kind of multicore cable conducting resistance measurement Wheatstone bridge.
Background technology
Along with improving constantly of air equipment automaticity, multicore cable has obtained application more and more, and the performance of cable also affects the normal work of equipment largely. Because multicore cable core number increases, it is more complicated that its interconnecting relation also becomes, and this just requires cable testing equipment to possess more number of test points. Traditional manual test method wastes time and energy, and poor accuracy can not meet through engineering approaches, the needs of batch production.
Wheatstone bridge (claiming again wheatstone bridge) is a kind of accurately instrument of measuring resistance. By setting in advance a certain proportion of resistance, regulate measured resistance to make bridge balance, thereby calculate testing resistance resistance. Between each cable core of Aviation cable, resistance is very little, and traditional Wheatstone bridge is very little at the resistance of measuring, and while arriving ohm level, is easily subject to the impact of external interference.
Summary of the invention
The technological deficiency that is easily subject to external interference for overcoming the Wheatstone bridge of prior art in the little resistance of measurement, the invention discloses a kind of multicore cable conducting resistance measurement Wheatstone bridge.
Multicore cable conducting resistance measurement Wheatstone bridge of the present invention, comprise four arm resistances that form Wheatstone bridge, wherein the intermediate node of the first brachium pontis, the second brachium pontis is connected with the first operational amplifier and the second operational amplifier respectively, the intermediate node of described the first brachium pontis is also connected with the slider that is connected to the swept resistance between VDD-to-VSS, described the first brachium pontis is directly connected with power supply with top, and the second brachium pontis top is connected with power supply by regulating resistance;
The output of described the first operational amplifier and the second operational amplifier is connected with inverting input and the normal phase input end of the 3rd operational amplifier respectively; The output of each operational amplifier is all also connected with its inverting input, and described the 3rd operational amplifier output terminal is also connected with sampling amplifier input.
Concrete, the first operational amplifier and the second operational amplifier are OP497.
Concrete, described the 3rd operational amplifier output terminal is also connected described sampling amplifier with sampling amplifier input be MAX197.
Concrete, described the 3rd operational amplifier is INA145.
Concrete, two resistance of described the first brachium pontis equate.
Multicore cable conducting resistance measurement Wheatstone bridge of the present invention, two arms of Wheatstone bridge are made a response to the minor variations of power supply simultaneously, and output signal is sent into difference amplifier, thereby have eliminated common mode disturbances, have improved test accuracy.
Brief description of the drawings
Fig. 1 is a kind of detailed description of the invention schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is done to detailed description further, but embodiments of the present invention are not limited to this.
Multicore cable conducting resistance measurement Wheatstone bridge of the present invention, comprise four arm resistances that form Wheatstone bridge, wherein the intermediate node of the first brachium pontis, the second brachium pontis is connected with the first operational amplifier and the second operational amplifier respectively, the intermediate node of described the first brachium pontis is also connected with the slider that is connected to the swept resistance between VDD-to-VSS, described the first brachium pontis is directly connected with power supply with top, and the second brachium pontis top is connected with power supply by regulating resistance;
The output of described the first operational amplifier and the second operational amplifier is connected with inverting input and the normal phase input end of the 3rd operational amplifier respectively; The output of each operational amplifier is all also connected with its inverting input, and described the 3rd operational amplifier output terminal is also connected with sampling amplifier input.
As shown in Figure 1, R1, R2 and R3 composition reference circuit; R4, R5 and Rx are together in series and form main test loop. In the time that testing resistance Rx is zero, adjust R1 and make electric bridge in poised state, i.e. U1=U2, circuit output is about zero, produces benchmark comparative voltage U1 simultaneously. Under circuit normal operation, Rx series connection enters after circuit, and the balance of electric bridge is broken, and U2 diminishes, U1 and U2 send into difference amplifier INA145 and amplify after the isolation of amplifier OP497, and the MAX197 that the voltage signal after amplification is sent into 12 precision samples. Two arms of Wheatstone bridge are made a response to the minor variations of power supply simultaneously, and output signal is sent into difference amplifier, thereby have eliminated common mode disturbances, have improved test accuracy.
As mentioned above, can realize preferably the present invention.
Claims (5)
1. multicore cable conducting resistance measurement Wheatstone bridge, it is characterized in that, comprise four arm resistances that form Wheatstone bridge, wherein the intermediate node of the first brachium pontis, the second brachium pontis is connected with the first operational amplifier and the second operational amplifier respectively, the intermediate node of described the first brachium pontis is also connected with the slider that is connected to the swept resistance between VDD-to-VSS, described the first brachium pontis is directly connected with power supply with top, and the second brachium pontis top is connected with power supply by regulating resistance;
The output of described the first operational amplifier and the second operational amplifier is connected with inverting input and the normal phase input end of the 3rd operational amplifier respectively; The output of each operational amplifier is all also connected with its inverting input.
2. multicore cable conducting resistance measurement Wheatstone bridge according to claim 1, is characterized in that, the first operational amplifier and the second operational amplifier are OP497.
3. multicore cable conducting resistance measurement Wheatstone bridge according to claim 1, is characterized in that, described the 3rd operational amplifier output terminal is also connected described sampling amplifier with sampling amplifier input be MAX197.
4. multicore cable conducting resistance measurement Wheatstone bridge according to claim 1, is characterized in that, described the 3rd operational amplifier is INA145.
5. multicore cable conducting resistance measurement Wheatstone bridge according to claim 1, is characterized in that, two resistance of described the first brachium pontis equate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410552759.0A CN105588967A (en) | 2014-10-19 | 2014-10-19 | Wheatstone bridge for multi-core cable on-state resistance measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410552759.0A CN105588967A (en) | 2014-10-19 | 2014-10-19 | Wheatstone bridge for multi-core cable on-state resistance measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105588967A true CN105588967A (en) | 2016-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410552759.0A Pending CN105588967A (en) | 2014-10-19 | 2014-10-19 | Wheatstone bridge for multi-core cable on-state resistance measurement |
Country Status (1)
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| CN (1) | CN105588967A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761205A (en) * | 2018-05-21 | 2018-11-06 | 中国电建集团河南工程有限公司 | Cable through and the test method and tester of insulation |
| CN115454193A (en) * | 2022-08-16 | 2022-12-09 | 四川泛华航空仪表电器有限公司 | Simple adjustable Wheatstone bridge voltage stabilizing circuit |
-
2014
- 2014-10-19 CN CN201410552759.0A patent/CN105588967A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761205A (en) * | 2018-05-21 | 2018-11-06 | 中国电建集团河南工程有限公司 | Cable through and the test method and tester of insulation |
| CN115454193A (en) * | 2022-08-16 | 2022-12-09 | 四川泛华航空仪表电器有限公司 | Simple adjustable Wheatstone bridge voltage stabilizing circuit |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160518 |