CN110501572A - A kind of test method of Wheatstone bridge resistance - Google Patents
A kind of test method of Wheatstone bridge resistance Download PDFInfo
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- CN110501572A CN110501572A CN201910918816.5A CN201910918816A CN110501572A CN 110501572 A CN110501572 A CN 110501572A CN 201910918816 A CN201910918816 A CN 201910918816A CN 110501572 A CN110501572 A CN 110501572A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a kind of test methods of Wheatstone bridge resistance, the both ends of four arm resistances in wheatstone bridge circuits, and respectively parallel a branch being made of concatenated ammeter and switch；It is respectively closed the switch of each road, connects the ammeter of the branch road；It is measured when each closing the switch corresponds to the electric current on arm resistance；Compensation resistance values are calculated by the current value and supply voltage that measure.Test method of the invention is accurate, and error is smaller, and the programmable value of calculation method is high, is easy to test development.
Description
Technical field
The present invention relates to electronic circuit test fields, and in particular to a kind of test method of Wheatstone bridge resistance.
Background technique
In the products such as integrated circuit, MEMS sensor, often uses one kind and be called wheatstone bridge circuits structure, such as
Shown in Fig. 1.In actual use, due to the influence of the factors such as process conditions, the resistance value of tetra- resistance of R1, R2, R3, R4 has difference
It is different, cause output voltage Vout not equal to 0.Existing technological means is by manual adjustment parallel resistance R, so that output voltage
Vout is equal to 0, then tests the numerical value of R, as compensation resistance values.Such method is inaccurate, and there are errors for measurement.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, a kind of Wheatstone bridge resistance is provided
Test method.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
A kind of test method of Wheatstone bridge resistance, the both ends of four arm resistances in wheatstone bridge circuits,
Respectively parallel a branch being made of concatenated ammeter and switch；
It is respectively closed the switch of each road, connects the ammeter of the branch road；It is measured when each closing the switch
Electric current on corresponding arm resistance；
By testing to obtain four current values I1, I2, I3 and I4 above；
If voltage at the node 2 that the first arm resistance R1, the second arm resistance R2 connect altogether be greater than third arm resistance R3,
When voltage at the node 4 that four bridge legs resistance R4 connects altogether, formula is utilizedCompensation resistance is calculated
The resistance value of R, and by the compensation resistor coupled in parallel at the second both ends arm resistance R2；V is the voltage of power supply VCC in formula；
If voltage at the node 2 that the first arm resistance R1, the second arm resistance R2 connect altogether be less than third arm resistance R3,
When voltage at the node 4 that four bridge legs resistance R4 connects altogether, formula is utilizedCompensation resistance is calculated
The resistance value of R, and by the compensation resistor coupled in parallel at the both ends third arm resistance R3.
Further, node 1 connects power supply VCC；Node 3 is grounded.
Further, access concatenated first ammeter A1 and first switch S1 between node 1 and node 2, formed with
The branch of first arm resistance R1 parallel connection；
Concatenated second ammeter A2 and second switch S2 is accessed between node 2 and node 3, is formed and the second bridge arm electricity
Hinder the branch of R2 parallel connection；
Concatenated third ammeter A3 and third switch S3 is accessed between node 3 and node 4, is formed and third bridge arm electricity
Hinder the branch of R3 parallel connection；
Concatenated 4th ammeter A4 and the 4th switch S4 is accessed between node 4 and node 1, is formed and four bridge legs electricity
Hinder the branch of R4 parallel connection.
Further, first switch S1 closure rest switch is all off, the first ammeter A1 measures the first current value
I1, and
Further, second switch S2 closure rest switch is all off, the second ammeter A2 measures the second current value
I2, and
Further, third switch S3 closure rest switch is all off, third ammeter A3 measures third current value
I3, and
Further, the 4th switch S4 closure rest switch is all off, the 4th ammeter A4 measures the 4th current value
I4, and
Advantageous effects of the invention:
The present invention complete by Wheatstone bridge be basic structure electronic product compensation resistance test, can
It is converted by electrical testing circuit and mathematical formulae, calculates the resistance value for needing to compensate on bridge arm, calculation method is programmable
Value is high, is easy to test development, and test is accurate, and error is smaller, thus efficiently solve Wheatstone bridge resistance test it is inaccurate,
There are problems that error.
Detailed description of the invention
Fig. 1 is the circuit of Wheatstone bridge in the prior art；
Fig. 2 is the test circuit diagram of Wheatstone bridge compensation resistance of the invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
The test method of Wheatstone bridge compensation resistance of the invention, comprising the following steps:
A. in each arm resistance both ends of Wheatstone bridge, the branch in parallel of respectively parallel an ammeter and switch composition
Road；
Concatenated ammeter A1 and switch S1 are accessed between node 1 and node 2, form the branch in parallel with resistance R1；
Concatenated ammeter A2 and switch S2 are accessed between node 2 and node 3, form the branch in parallel with resistance R2；
Concatenated ammeter A3 and switch S3 are accessed between node 3 and node 4, form the branch in parallel with resistance R3；
Concatenated ammeter A4 and switch S4 are accessed between node 4 and node 1, form the branch in parallel with resistance R4；
B. only one ammeter connects work every time, measures the corresponding electric current of each arm resistance respectively in four times
I1, I2, I3 and I4；
That is switch S1 closure rest switch is all off in Fig. 2, and it is I1 that ammeter A1, which measures numerical value, as shown in Figure 2
That is switch S2 closure rest switch is all off in Fig. 2, and it is I2 that ammeter A2, which measures numerical value, as shown in Figure 2
That is switch S3 closure rest switch is all off in Fig. 2, and it is I3 that ammeter A3, which measures numerical value, as shown in Figure 2
That is switch S4 closure rest switch is all off in Fig. 2, and it is I4 that ammeter A4, which measures numerical value, as shown in Figure 2
By testing to obtain four current values I1, I2, I3 and I4 above.
If 2 voltage of node is greater than 4 voltages of node, that is, V24 > 0, formula is utilizedR is calculated
Resistance value and be connected in parallel on the both ends resistance R2；V is the voltage of power supply VCC in formula；
If 4 voltage of node is greater than 2 voltage of node, that is, V24 < 0, utilize formulaIt is calculated
The resistance value of R and it is connected in parallel on the both ends resistance R3.
The R being calculated is compensation resistance values, is connected in parallel on the both ends arm resistance R2 or R3 according to the actual conditions of circuit.
Essence of the invention is the characteristics of being much smaller than testing resistance using amperemeter inner resistance, will to compensate the test job of resistance
It is transferred in the test job of each bridgc arm short electric current of Wheatstone bridge, then is converted by electricity theory deduction and mathematical formulae,
Calculate the exact value of compensation resistance.
Since 2 voltage of Wheatstone bridge node and 4 voltage of node that need to compensate resistance are unequal, therefore with 3 voltage of node
For reference voltage.The calculating of specific compensation resistance values are as follows:
If 2 voltage of node is greater than 4 voltage of node, referring to scheme 1.
If 4 voltage of node is greater than 2 voltage of node, referring to scheme 2.
Scheme 1: if 2 voltage of node is greater than 4 voltages of node, that is, V24 > 0, the both ends shunt compensation resistance R in R2 is needed, such as
Shown in Fig. 2, due to be added compensate resistance R after Vout=0,
By what is obtained beforeBring formula (1) into, abbreviation obtains
The R being calculated is compensation resistance values.
Scheme 2: if 4 voltage of node is greater than 2 voltage of node, that is, V24 < 0, the both ends shunt compensation resistance R in R3 is needed,
As shown in Fig. 2, due to Vout=0 after addition compensation resistance R,
By what is obtained beforeBring formula (2) into, abbreviation obtains
The R being calculated is compensation resistance values.
Since the characteristics of amperemeter inner resistance is far smaller than measured resistance is utilized in this method, i.e. arm resistance must be greater than electric current
Two orders of magnitude of table internal resistance.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of test method of Wheatstone bridge resistance, characterized in that four arm resistances in wheatstone bridge circuits
Both ends, respectively parallel one by concatenated ammeter and the branch that forms of switch；
It is respectively closed the switch of each road, connects the ammeter of the branch road；Its correspondence is measured when each closing the switch
Electric current on arm resistance；
By testing to obtain four current values I1, I2, I3 and I4 above；
If the voltage at the node 2 that the first arm resistance R1, the second arm resistance R2 connect altogether is greater than third arm resistance R3, the 4th
When voltage at the node 4 that arm resistance R4 connects altogether, formula is utilizedIt is calculated compensation resistance R's
Resistance value, and by the compensation resistor coupled in parallel at the second both ends arm resistance R2；V is the voltage of power supply VCC in formula；
If the voltage at the node 2 that the first arm resistance R1, the second arm resistance R2 connect altogether is less than third arm resistance R3, the 4th
When voltage at the node 4 that arm resistance R4 connects altogether, formula is utilizedIt is calculated compensation resistance R's
Resistance value, and by the compensation resistor coupled in parallel at the both ends third arm resistance R3.
2. a kind of test method of Wheatstone bridge resistance according to claim 1, characterized in that node 1 connects power supply
VCC；Node 3 is grounded.
3. a kind of test method of Wheatstone bridge resistance according to claim 2, characterized in that in node 1 and node 2
Between access concatenated first ammeter A1 and first switch S1, form the branch in parallel with the first arm resistance R1；
Concatenated second ammeter A2 and second switch S2 is accessed between node 2 and node 3, is formed and the second arm resistance R2
Branch in parallel；
Concatenated third ammeter A3 and third switch S3 is accessed between node 3 and node 4, is formed and third arm resistance R3
Branch in parallel；
Concatenated 4th ammeter A4 and the 4th switch S4 is accessed between node 4 and node 1, is formed and four bridge legs resistance R4
Branch in parallel.
4. a kind of test method of Wheatstone bridge resistance according to claim 3, characterized in that close first switch S1
Conjunction rest switch is all off, and the first ammeter A1 measures the first current value I1, and
5. a kind of test method of Wheatstone bridge resistance according to claim 3, characterized in that close second switch S2
Conjunction rest switch is all off, and the second ammeter A2 measures the second current value I2, and
6. a kind of test method of Wheatstone bridge resistance according to claim 3, characterized in that close third switch S3
Conjunction rest switch is all off, and third ammeter A3 measures third current value I3, and
7. a kind of test method of Wheatstone bridge resistance according to claim 3, characterized in that close the 4th switch S4
Conjunction rest switch is all off, and the 4th ammeter A4 measures the 4th current value I4, and
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112810547A (en) * | 2020-12-31 | 2021-05-18 | 宁波宝贝第一母婴用品有限公司 | Power supply control device and method for supplying power to child seat |
| CN115335667A (en) * | 2020-04-16 | 2022-11-11 | 威辛斯公司 | Weighing apparatus and method |
| WO2023041030A1 (en) * | 2021-09-16 | 2023-03-23 | 歌尔微电子股份有限公司 | Detection circuit and detection method for piezoresistive pressure sensor, and electronic device |
| WO2024001883A1 (en) * | 2022-06-30 | 2024-01-04 | 深圳市中兴微电子技术有限公司 | Interconnection structure impedance measurement circuit and measurement apparatus, and measurement method |
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| CN102368086A (en) * | 2011-08-31 | 2012-03-07 | 华东光电集成器件研究所 | Wheatstone bridge compensation resistance test method |
| CN102419393A (en) * | 2011-12-30 | 2012-04-18 | 江苏多维科技有限公司 | Current sensor |
| CN206292307U (en) * | 2016-11-16 | 2017-06-30 | 李卓昊 | A kind of device of utilization Wheatstone bridge measuring resistance |
| CN110244125A (en) * | 2019-03-12 | 2019-09-17 | 南京晓庄学院 | A kind of self shifter precision resister measuring device and method |
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2019
- 2019-09-26 CN CN201910918816.5A patent/CN110501572A/en active Pending
Patent Citations (4)
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| CN102368086A (en) * | 2011-08-31 | 2012-03-07 | 华东光电集成器件研究所 | Wheatstone bridge compensation resistance test method |
| CN102419393A (en) * | 2011-12-30 | 2012-04-18 | 江苏多维科技有限公司 | Current sensor |
| CN206292307U (en) * | 2016-11-16 | 2017-06-30 | 李卓昊 | A kind of device of utilization Wheatstone bridge measuring resistance |
| CN110244125A (en) * | 2019-03-12 | 2019-09-17 | 南京晓庄学院 | A kind of self shifter precision resister measuring device and method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115335667A (en) * | 2020-04-16 | 2022-11-11 | 威辛斯公司 | Weighing apparatus and method |
| CN115335667B (en) * | 2020-04-16 | 2023-06-27 | 威辛斯公司 | Weighing device and method |
| CN112810547A (en) * | 2020-12-31 | 2021-05-18 | 宁波宝贝第一母婴用品有限公司 | Power supply control device and method for supplying power to child seat |
| CN112810547B (en) * | 2020-12-31 | 2023-01-20 | 宁波宝贝第一母婴用品有限公司 | Power supply control device and method for supplying power to child seat |
| WO2023041030A1 (en) * | 2021-09-16 | 2023-03-23 | 歌尔微电子股份有限公司 | Detection circuit and detection method for piezoresistive pressure sensor, and electronic device |
| WO2024001883A1 (en) * | 2022-06-30 | 2024-01-04 | 深圳市中兴微电子技术有限公司 | Interconnection structure impedance measurement circuit and measurement apparatus, and measurement method |
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Application publication date: 20191126 |