CN104407222A - Method for measuring electrical resistivity of irregular small-section copper bar material - Google Patents
Method for measuring electrical resistivity of irregular small-section copper bar material Download PDFInfo
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- CN104407222A CN104407222A CN201410723800.6A CN201410723800A CN104407222A CN 104407222 A CN104407222 A CN 104407222A CN 201410723800 A CN201410723800 A CN 201410723800A CN 104407222 A CN104407222 A CN 104407222A
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Abstract
The invention discloses a method for measuring electrical resistivity of irregular small-section copper bar material. The method mainly comprises the following steps: measuring a gauge length L of a test sample by using a vernier caliper, and obtaining a gauge resistance R of the measured test sample through bridge measurement; measuring by using the vernier caliper and a precision electronic balance respectively to obtain the length l and the mass m of the test sample; according to the Archimedes law, measuring the density <Rho test sample> of the test sample; substituting the length l, the mass m and the density <Rho test sample>, which are obtained through measuring, of the test sample into a sectional area calculating formula which is shown in the Specification to obtain the sectional area A of the test sample; substituting the gauge length L and the gauge resistance R measured in the first step, of the test sample and the calculated sectional area A of the test sample into the formula (R=<Rho test sample>L/A) to obtain the electrical resistivity Rho of the test sample. Through practical application, electrical resistivity data, measured by the method, of the irregular small-section copper bar material is identical with data, measured by an electrical resistivity instrument, of an extruded copper product and is consistent with a testing result of goods requiring people, so that requirements of customers are met.
Description
Technical field
The present invention relates to a kind of metal material method of measuring resistivity, particularly a kind of irregular small bore copper bar material method of measuring resistivity.
Background technology
Metal material resistivity determines that it conducts the important indicator of performance, the raising required the busbar conductivity of material general character along with electrical apparatus industry, and especially nuclear power enterprise requires that the resistivity of copper material product is higher especially and (is not more than 1.724 × 10
-8Ω .m), this just proposes very high requirement to raw-material resistivity measurement precision.At present, a lot of enterprise generally all adopts the conductance of conductivity meter measuring metallic materials to be converted into resistivity again, this method of testing requires that there are certain area and probe contacts in metal surface, and during, along its length outside surface irregular metal material test less for sectional area, just can not obtain data accurately.
In addition, what Most current busbar adopted is by after continuously extruded for small bore copper bar material shaping, then makes busbar, in order to ensure the performance of bus bar products, carries out resistivity measurement with regard to needing to continuously extruded front copper bar material.Because the copper bar material before continuously extruded adopts up-drawing method to make, most diameter≤25mm, not only sectional area is less, and draw in stepping in forming process, the transient of pitch causes copper bar material outside surface rough, there is microscopic differences in corresponding cross section, so, use conductivity meter not accurately measure resistivity.Therefore, the resistivity measurement problem solving irregular small bore copper bar material is very important.
Summary of the invention
The present invention is directed to existing issue, propose a kind of convenient irregular small bore copper bar material method of measuring resistivity accurately.
In order to achieve the above object, technical scheme of the present invention is: a kind of irregular small bore copper bar material method of measuring resistivity, mainly comprises the steps:
Step one, recorded the gauge length L of sample by vernier caliper, utilize bridge measurement to draw the gauge length resistance R of tested sample;
Step 2, to measure by vernier caliper and precision electronic balance respectively, draw length l and the quality m of sample;
Step 3, measure the density p of sample according to Archimedes' principle
sample;
Step 4, length l, the quality m of sample that step 2, three is measured and density p
samplesubstitute into sectional area computing formula
the area of section A of sample can be drawn; Gauge length L, the gauge length resistance R of sample step one measured and the specimen cross section area A calculated, substitute into formula R=ρ
samplel/A, can calculate the electricalresistivityρ of sample.
Described on base, in step 3, the concrete measuring method of the density d of sample is: get the test specimen identical with sample, surveys its quality m in atmosphere by precision electronic balance
1, in the water that then submerged, survey its quality m
2, according to formula G
1=m
1g=ρ
test specimenv
test specimeng, G
1-G
2=(m
1-m
2) g=ρ
waterv
rowg, obtains
wherein, ρ
waterfor the density of pure water, ρ
water=1, the data recorded are substituted into formula (1) sample density ρ can be obtained
sample.
Described on base, in order to reduce measuring error, making multiple Specimen Determination density, getting the density of its arithmetic mean as test specimen.
The invention has the beneficial effects as follows: 1) method of measuring resistivity provided by the invention accurately can calculate the resistivity of irregular small bore metal material.By practical application, the irregular small bore copper bar material resistivity data that the method records, the data using conductivity meter to record with the copper material product after extrusion process are coincide, and consistent with needing the testing result of cargo interests, meet the requirement of client; 2) adopt the method, can also classify in advance to the starting material of different conductance, process corresponding product by performance requirement, avoid the production of performance inconsistency lattice.
Embodiment
Design of the present invention is as follows:
According to law of resistance R=ρ L/A, calculating is drawn copper bar material electricalresistivityρ and need three parameters: gauge length L, the gauge length resistance R of tested sample and sectional area A.Wherein gauge length can record with vernier caliper, and gauge length resistance utilizes bridge measurement to draw, key issue determines sectional area.On draw copper bar cross section be irregular inpolygon from microcosmic, if by measuring specimen finish area formula of circle π r
2substitute into calculate and can introduce comparatively big error undoubtedly, the measuring accuracy of resistivity cannot be ensured.
In order to obtain more accurate area of section, the method by measuring specimen length, quality and density is adopted to obtain accurate area of section, wherein specimen length and quality are measured by vernier caliper and precision electronic balance respectively, density then obtains by the following method: get the solid being made into rule with sample with the test specimen criticizing (secondary), weigh in air and water respectively by precision electronic balance and measure its density, in order to reduce measuring error as far as possible, multiple Specimen Determination density can be made, get the density of its arithmetic mean as test specimen.
The piece lengths the above obtained, quality and density substitute into formula
the area of section of sample can be drawn.
The sectional area A gauge length of sample, gauge length resistance and above formula obtained substitutes into the resistivity that formula R=ρ L/A can calculate sample.
According to above-mentioned design, concrete steps of the present invention are as follows:
Step one, recorded the gauge length L of sample by vernier caliper, utilize bridge measurement to draw the gauge length resistance R of tested sample;
Step 2, to measure by vernier caliper and precision electronic balance respectively, draw length l and the quality m of sample;
Step 3, measure the density p of sample according to Archimedes' principle
sample;
Step 4, length l, the quality m of sample that step 2, three is measured and density p
samplesubstitute into sectional area computing formula
the area of section A of sample can be drawn; Gauge length L, the gauge length resistance R of sample step one measured and the specimen cross section area A calculated, substitute into formula R=ρ
samplel/A, can calculate the electricalresistivityρ of sample.
Wherein, in step 3, the concrete measuring method of the density d of sample is: get the test specimen identical with sample, surveys its quality m in atmosphere by precision electronic balance
1, in the water that then submerged, survey its quality m
2, according to formula G
1=m
1g=ρ
test specimenv
test specimeng, G
1-G
2=(m
1-m
2) g=ρ
waterv
rowg, obtains
wherein, ρ
waterfor the density of pure water, ρ
water=1, the data recorded are substituted into formula (1) sample density ρ can be obtained
sample, in order to reduce measuring error, also can make multiple Specimen Determination density, getting the density of its arithmetic mean as test specimen.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (3)
1. an irregular small bore copper bar material method of measuring resistivity, is characterized in that, mainly comprise the steps:
Step one, recorded the gauge length L of sample by vernier caliper, utilize bridge measurement to draw the gauge length resistance R of tested sample;
Step 2, to measure by vernier caliper and precision electronic balance respectively, draw length l and the quality m of sample;
Step 3, measure the density p of sample according to Archimedes' principle
sample;
Step 4, length l, the quality m of sample that step 2, three is measured and density p
samplesubstitute into sectional area computing formula
the area of section A of sample can be drawn; Gauge length L, the gauge length resistance R of sample step one measured and the specimen cross section area A calculated, substitute into formula R=ρ
samplel/A, can calculate the electricalresistivityρ of sample.
2. irregular small bore copper bar material method of measuring resistivity according to claim 1, it is characterized in that, in step 3, the concrete measuring method of the density d of sample is: get the test specimen identical with sample, surveys its quality m in atmosphere by precision electronic balance
1, in the water that then submerged, survey its quality m
2, according to formula G
1=m
1g=ρ
test specimenv
test specimeng, G
1-G
2=(m
1-m
2) g=ρ
waterv
rowg, obtains
wherein, ρ
waterfor the density of pure water, ρ
water=1, the data recorded are substituted into formula (1) sample density ρ can be obtained
sample.
3. irregular small bore copper bar material method of measuring resistivity according to claim 2, is characterized in that, in order to reduce measuring error, making multiple Specimen Determination density, getting the density of its arithmetic mean as test specimen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410723800.6A CN104407222A (en) | 2014-12-02 | 2014-12-02 | Method for measuring electrical resistivity of irregular small-section copper bar material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410723800.6A CN104407222A (en) | 2014-12-02 | 2014-12-02 | Method for measuring electrical resistivity of irregular small-section copper bar material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104407222A true CN104407222A (en) | 2015-03-11 |
Family
ID=52644867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410723800.6A Pending CN104407222A (en) | 2014-12-02 | 2014-12-02 | Method for measuring electrical resistivity of irregular small-section copper bar material |
Country Status (1)
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| CN (1) | CN104407222A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612422A (en) * | 2018-12-18 | 2019-04-12 | 吴江变压器有限公司 | A kind of the actual average area of section and measurement of length method of transformer conducting wire |
| CN109991474A (en) * | 2019-03-06 | 2019-07-09 | 合肥国轩高科动力能源有限公司 | A kind of foil resistivity measurement method |
| CN117347721A (en) * | 2023-10-07 | 2024-01-05 | 河北华伦线缆有限公司 | Quality control method for high-conductivity cable |
Citations (4)
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|---|---|---|---|---|
| CN2063641U (en) * | 1989-12-13 | 1990-10-10 | 王嘉贤 | Dynamometer type densimeter |
| US20130043893A1 (en) * | 2010-02-25 | 2013-02-21 | Evonik Degussa Gmbh | Use of specific resistivity measurement for indirect determination of the purity of silanes and germanes and a corresponding process |
| CN202994906U (en) * | 2012-11-29 | 2013-06-12 | 中国科学院山西煤炭化学研究所 | An apparatus having four probes for measuring resistivity of graphite fibers |
| CN104090164A (en) * | 2014-04-22 | 2014-10-08 | 河海大学 | Conductor conductivity one-dimension distribution measurement method and device based on compression perception principle |
-
2014
- 2014-12-02 CN CN201410723800.6A patent/CN104407222A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2063641U (en) * | 1989-12-13 | 1990-10-10 | 王嘉贤 | Dynamometer type densimeter |
| US20130043893A1 (en) * | 2010-02-25 | 2013-02-21 | Evonik Degussa Gmbh | Use of specific resistivity measurement for indirect determination of the purity of silanes and germanes and a corresponding process |
| CN202994906U (en) * | 2012-11-29 | 2013-06-12 | 中国科学院山西煤炭化学研究所 | An apparatus having four probes for measuring resistivity of graphite fibers |
| CN104090164A (en) * | 2014-04-22 | 2014-10-08 | 河海大学 | Conductor conductivity one-dimension distribution measurement method and device based on compression perception principle |
Non-Patent Citations (2)
| Title |
|---|
| 刘增利 等: "《倍速学习法 高中物理》", 30 April 2013, 开明出版社 * |
| 孙玉勤: "用阿基米德定律测固体的密度", 《物理教学》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612422A (en) * | 2018-12-18 | 2019-04-12 | 吴江变压器有限公司 | A kind of the actual average area of section and measurement of length method of transformer conducting wire |
| CN109612422B (en) * | 2018-12-18 | 2020-11-24 | 吴江变压器有限公司 | Method for measuring actual average cross-sectional area and length of transformer wire |
| CN109991474A (en) * | 2019-03-06 | 2019-07-09 | 合肥国轩高科动力能源有限公司 | A kind of foil resistivity measurement method |
| CN117347721A (en) * | 2023-10-07 | 2024-01-05 | 河北华伦线缆有限公司 | Quality control method for high-conductivity cable |
| CN117347721B (en) * | 2023-10-07 | 2024-04-30 | 河北华伦线缆有限公司 | Quality control method for high-conductivity cable |
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Application publication date: 20150311 |