CN107741511B - Convenient joint for resistance measurement by four-lead method - Google Patents
Convenient joint for resistance measurement by four-lead method Download PDFInfo
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- CN107741511B CN107741511B CN201711189294.7A CN201711189294A CN107741511B CN 107741511 B CN107741511 B CN 107741511B CN 201711189294 A CN201711189294 A CN 201711189294A CN 107741511 B CN107741511 B CN 107741511B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
Abstract
The invention discloses a convenient joint for resistance measurement by a four-lead method, wherein a to-be-tested piece is fixed on a test platform in the resistance measurement process, and then measurement is carried out by a measuring device; the device comprises a support and a contact, wherein the support is connected with a test platform, the contact is connected with a test piece, and the support presses the contact on the test piece. The resistance tester has a simple structure and accurate measurement, can be flexibly designed according to requirements, is suitable for different test objects, and can be used for measuring the resistance of special-shaped test pieces and small test pieces; and welding is not required when the test piece is connected, and high electrical connection stability is still achieved.
Description
Technical Field
The invention relates to a device for measuring resistance, in particular to a convenient joint for resistance measurement by a four-lead method, and belongs to the technical field of resistance measurement.
Background
The four-lead method is a high-precision measurement method for measuring electronic devices, in particular small-resistance electronic devices. When measuring the resistance value of a test piece by the four-lead method, two current leads and at least two voltage leads need to be fixed on the test piece, and the leads, especially the voltage leads, need to be in good contact with the test piece to ensure the accuracy of measurement, so welding is generally adopted. Electronic devices are various in forms, some devices are not provided with reserved terminals for welding, direct welding is inconvenient, and therefore preliminary preparation work needs to be carried out for a long time when the four-lead method is used for measurement, the working efficiency is influenced, and even the reliability of a measurement result is influenced due to the problem of welding quality.
In the prior art, researches on resistance measurement by a four-lead method include an electric transport characteristic measuring device and a measuring method (patent publication number: CN103941117A) of Shanghai transportation university, and discloses an electric transport characteristic measuring device which can measure the anisotropic electric transport characteristic of a crystal material through a plurality of steps, so that the problem that the traditional four-probe transport testing device cannot conveniently measure the anisotropic electric transport characteristic is solved, the operation process is greatly simplified, and the experiment efficiency is improved. In addition, "a four-lead battery clamp" (patent publication No. CN205506870U) of zhhai vertical flight technical service limited discloses a four-lead battery clamp, which can realize four-lead connection without welding battery end leads, thereby improving efficiency. In addition, the ' steering column switch welding on-off detection device ' of the Fraleio automobile internal control (Shanghai) ' Limited company (patent publication No. CN206378567U) discloses a utility model applied to the technical field of automobile part assembly, in particular to a steering column switch welding on-off detection device, which adopts a four-lead method of oppositely inserting a test point probe and a wire harness end connector and is connected with a universal meter in series to measure impedance, detects the on-off of a welding point, is applicable to various PCBAs of Volvo and Geely, is convenient, efficient and saves cost.
The above inventions and utility model patents are applied to respective fields to improve the measurement efficiency to achieve excellent technical effects, but they can be applied only to specific measurement objects. And the devices and joint structures are complex, so that the sizes of the devices and the joint structures are large relative to each other, and the test objects with small sizes are not easy to measure.
In order to solve the technical problems, the invention needs to provide a convenient joint which has a simple structure and accurate measurement and can be applied to resistance measurement of a precise device.
Disclosure of Invention
The invention discloses a convenient joint for resistance measurement by a four-lead method, which can be used for measuring the resistance of a special-shaped test piece and a small test piece, omits a welding process, improves the measurement efficiency, and has a simple structure and high measurement accuracy.
A convenient joint for resistance measurement by a four-lead method is characterized in that a to-be-tested piece is fixed on a test platform in the resistance measurement process, and then measurement is carried out by a measuring device; the device is characterized by comprising a support and a contact, wherein the support is connected with the test platform, the contact is connected with the test piece, and the support tightly presses the contact on the test piece.
Further, the support comprises a platform connecting portion and a contact pressing portion, the platform connecting portion is detachably connected with the test platform, and the contact pressing portion is in contact with the contact.
Preferably, the platform connecting part is connected with the test platform through bonding, rivets or bolts.
Preferably, the contact pressing part comprises an adjusting bolt, and the bottom of the adjusting bolt is in contact with the contact.
Further, the contact comprises an insulating block, an arched guide vane and a lead; the insulating block is contacted with the contact pressing part; the concave surface of the arched guide piece is connected with the insulating block, the convex surface of the arched guide piece is connected with the test piece, and the arched guide piece is connected with one end of a lead; the other end of the wire is connected with the measuring device.
Preferably, the arc-shaped guide vane is connected with the insulating block through bonding, rivets or bolts.
Further, the contact is connected with the test piece through silver colloid.
Further, the convenient joint comprises a bracket and four contacts; the bracket is of an integrated structure and comprises a platform connecting part and a contact pressing part; the platform connecting part consists of two connecting plates corresponding to each other in position, and the connecting plates are respectively connected with the test platform through bolts; the contact pressing part comprises a pressing plate and two supporting plates, one end of each of the two supporting plates is vertically connected with one end of each of the two connecting plates, the two ends of each of the pressing plates are vertically connected with one end, far away from the connecting plate, of each of the two supporting plates, a screw hole is formed in each of the pressing plates, an adjusting bolt is installed in each screw hole, and the bottom of each adjusting bolt is in contact with the contact; the contact comprises an insulating block, an arched guide vane and a wire, the insulating block is of a rectangular structure, and the top surface of the insulating block is in contact with the bottom of the adjusting bolt; the concave surface of the arched guide piece is connected with the bottom surface of the insulating block, the convex surface of the arched guide piece is connected with the test piece, the arched guide piece is connected with one end of the lead in a welding mode, and the other end of the lead is connected with the measuring device.
Further, the test piece is provided with leads, and the sum of the number of the contacts and the number of the leads of the test piece is greater than or equal to four.
The convenient joint for resistance measurement by the four-lead method disclosed by the invention has the advantages of simple structure and accurate measurement, can be flexibly designed according to needs, is suitable for different test objects, and can be used for measuring the resistance of special-shaped test pieces and small test pieces; and welding is not required when the test piece is connected, but high electrical connection stability is still achieved.
According to the convenient joint disclosed by the invention, the contact is designed to be contacted with the to-be-tested piece through the arc-shaped guide sheet, so that the contact is more reliable, the provided contact area is larger, and lower contact resistance can be obtained, so that a smaller resistance value can be measured; and the contact area of the arc-shaped guide piece and the test piece is adjustable, so that different measurement requirements can be met. Simultaneously, even if external condition changes, when leading to pressure between support and the contact to increase by a wide margin, this structure also can alleviate the power of acting on the test piece to a certain extent, avoids the test piece to be destroyed.
The platform connecting part of the bracket is detachably connected with the test platform, so that the bracket can be stably connected with the test platform in the measuring process, and the stability of electrical connection in the measuring process is ensured. The detachable connection can facilitate the detachment of the support after the measurement is finished, and the detachable connection mode can meet different test requirements.
The interval between every contact and the support can all finely tune with structures such as bolt alone to adjust the pressure between each contact and the test piece, and then adjust the area of contact between bow-shaped guide plate and the test piece, with the demand that satisfies the test in-process.
The four contacts can be used for measuring the resistance by a four-lead method. Compared with the measuring instrument in the prior art, the convenient joint provided by the invention has the advantages of simple structure and high measurement accuracy, and can be used for measuring the resistance of small test pieces and precise components. And smearing the silver glue between the contact and the test piece to ensure that the contact resistance can approach the welding resistance; meanwhile, the silver colloid is used, and can be washed away by an organic solvent after testing, so that the requirements on the test piece are low, and the pollution is low.
The four-lead method is a high-precision measurement method for measuring electronic devices, in particular small-resistance electronic devices. When the resistance is measured by using the four-lead method, two current leads and at least two voltage leads are needed, and when the test piece is provided with the leads, the resistance of the test piece can be measured by using the four-lead method as long as the number of contacts in the convenient joint and the number of the leads of the test piece are ensured to be more than four. And when the resistance between different points on the test piece needs to be measured, the number of leads can be increased to be used as additional voltage leads, so that the number of convenient joints can be increased when the resistance between different points of the test piece is measured.
Drawings
FIG. 1 is a schematic diagram of a convenient joint for four-lead resistance measurement;
FIG. 2 is a cross-sectional view of a convenient joint for four-lead method resistance measurement;
FIG. 3 is a schematic diagram of a convenient joint for four-lead resistance measurement;
FIG. 4 is a first RT curve of measuring the resistance of a superconducting thin film as a function of temperature;
FIG. 5 is a second RT curve of measuring the resistance of the superconducting thin film with temperature;
fig. 6 is a RT curve of resistance of a superconducting thin film measured with temperature using a conventional four-lead method.
Description of the drawings: 1. a support; 2. a contact; 3. a connecting plate; 4. a compression plate; 5. a support plate; 6. adjusting the bolt; 7. an insulating block; 8. an arcuate guide vane; 9. a wire; 10. a test piece; 11. and (7) testing the platform.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1, a convenient joint for resistance measurement by a four-lead method comprises a bracket 1 and four contacts 2; the resistance measurement is to fix the tested piece to be tested in a test platform for measurement.
The bracket 1 is an integrated structure and comprises a platform connecting part and a contact pressing part; the platform connecting part consists of two connecting plates 3 corresponding to each other in position, and the connecting plates 3 are respectively connected with the test platform through bolts; the contact pressure part comprises a pressure plate 4 and two supporting plates 5, one ends of the two supporting plates 5 are respectively and vertically connected with one ends of the two connecting plates 3, two ends of the pressure plate 4 are respectively and vertically connected with one ends of the two supporting plates 5 far away from the connecting plates 3, four screw holes are formed in the pressure plate 4, adjusting bolts 6 are respectively installed in the screw holes, and the bottoms of the adjusting bolts 6 are respectively contacted with the contacts 2 to achieve the technical effect that the contacts 2 are pressed on the test platform.
The contact 2 comprises an insulating block 7, an arched guide vane 8 and a lead 9, wherein the insulating block 7 is of a cuboid structure, and the top surface of the insulating block 7 is in contact with the bottom surface of the adjusting bolt 6; the concave surface of the arched guide sheet 8 is connected with the bottom surface of the insulating block 7, the convex surface of the arched guide sheet 8 is connected with the test piece, the arched guide sheet 8 is connected with one end of the lead 9 through welding, and the other end of the lead 9 is connected with the measuring device.
Further, the arc-shaped guide vane 8 is connected with the insulating block 7 through a bolt.
Further, the convex surface of the arc-shaped guide sheet 8 is connected with the test piece through silver colloid.
In the using process, firstly, preparing a contact: cutting the long-strip-shaped epoxy board into insulating blocks according to the required size, then adhering the insulating blocks with a copper sheet to enable the copper sheet to form an arched guide sheet, and then welding the arched guide sheet with a lead to obtain a contact; then, installation is carried out: firstly, adhering a test piece on a low-temperature platform by using low-temperature glue; then, sequentially adhering the four contacts on the test piece by using silver adhesive; the mounting bracket is provided with an adjusting bolt at a position corresponding to the contact for fixing each contact; the contact area between each contact and a piece to be tested is adjusted through the adjusting bolt, and silver colloid can be added in the process, so that the contact resistance is reduced; after the adjustment is finished, the wires connected with the contacts are respectively connected into the current source and the nanovolt meter to measure the resistance.
Example 2
As shown in fig. 2, the convenient joint for resistance measurement by a four-lead method is used for fixing a piece to be tested 10 in a testing platform 11 for measurement, and comprises a bracket 1 and a contact.
The bracket 1 is an integrated structure and comprises a platform connecting part and a contact pressing part; the platform connecting part consists of two connecting plates 3 corresponding to each other in position, and the connecting plates 3 are respectively connected with the test platform 11 through bolts; the contact pressing portion comprises a pressing plate 4 and two supporting plates 5, one ends of the two supporting plates 5 are connected with one ends of the two connecting plates 3 respectively, two ends of the pressing plate 4 are perpendicularly connected with one ends, far away from the connecting plates 3, of the two supporting plates 5 respectively, screw holes are formed in the pressing plate 4, adjusting bolts 6 are installed in the screw holes, and the bottoms of the adjusting bolts 6 are in contact with the contacts 2 to achieve the technical effect that the contacts 2 are pressed on the test platform 11.
The contact 2 comprises an insulating block 7, an arched guide vane 8 and a lead 9, wherein the insulating block 7 is of a cuboid structure, and the top surface of the insulating block 7 is in contact with the bottom surface of the adjusting bolt 6; the concave surface of the arched guide sheet 8 is connected with the bottom surface of the insulating block 7, the convex surface of the arched guide sheet 8 is connected with the test piece 10, the arched guide sheet 8 is connected with one end of the lead 9 through welding, and the other end of the lead 9 is connected with the measuring device.
Further, the arc-shaped guide vane 8 is connected with the insulating block 7 through a rivet.
Further, the convex surface of the arc-shaped guide vane 8 is connected with the test piece 10 through silver glue.
The convenient joint for resistance measurement by the four-lead method only consists of one support and one contact, but the number and the relative position of the convenient joint can be determined according to requirements in the use process, so that different measurement requirements are met.
The resistance is measured by using a four-lead method, two current leads and at least two voltage leads are needed, and when the resistance between different points on a test piece is measured, the number of the leads can be increased to be used as additional voltage leads; the convenient joint for measuring the resistance by using the four-lead method disclosed by the embodiment 2 is used for measuring the resistance, and the specific steps are as follows:
(1) firstly, determining whether a current lead and/or a voltage lead exist in a piece to be tested, determining the number of leads according to measurement requirements, and further determining the number of convenient joints;
(2) preparing a contact: cutting the long-strip-shaped epoxy board into insulating blocks according to the required size, then adhering the insulating blocks with a copper sheet to enable the copper sheet to form an arched guide sheet, and then welding the arched guide sheet with a lead to obtain a contact; (ii) a
(3) Installation and adjustment: firstly, adhering a test piece on a low-temperature platform by using low-temperature glue; then, adhering the contact on the test piece by using silver adhesive; installing a bracket at a position corresponding to the contact, and installing an adjusting bolt for fixing each contact; adjusting the contact area of each contact and a piece to be tested through an adjusting bolt, and adding silver colloid in the process to reduce contact resistance;
(4) after the installation and the adjustment are finished, the wires connected with the contacts are respectively connected into a current source and a nanovolt meter to measure the resistance;
example 3
A convenient joint for resistance measurement by a four-lead method is used for fixing a to-be-tested piece in a test platform for measurement in the resistance measurement process and comprises a support 1 and three contacts 2.
The bracket 1 is an integrated structure and comprises a platform connecting part and a contact pressing part; the platform connecting part consists of two connecting plates 3 corresponding to each other in position, and the connecting plates 3 are respectively connected with the test platform through bolts; the contact pressure part comprises a pressure plate 4 and two supporting plates 5, one ends of the two supporting plates 5 are respectively connected with one ends of the two connecting plates 3, two ends of the pressure plate 4 are respectively perpendicularly connected with one ends, far away from the connecting plates 3, of the two supporting plates 5, a plurality of screw holes are formed in the pressure plate 4, adjusting bolts 6 are installed in the screw holes, and the bottoms of the adjusting bolts 6 are in contact with the contacts 2 to achieve the technical effect that the contacts 2 are pressed on the test platform.
The contact 2 comprises an insulating block 7, an arched guide vane 8 and a lead 9, wherein the insulating block 7 is of a cuboid structure, and the top surface of the insulating block 7 is in contact with the bottom surface of the adjusting bolt 6; the concave surface of the arched guide sheet 8 is connected with the bottom surface of the insulating block 7, the convex surface of the arched guide sheet 8 is connected with the test piece, the arched guide sheet 8 is connected with one end of the lead 9 through welding, and the other end of the lead 9 is connected with the measuring device.
Furthermore, be equipped with a plurality of screws on the pressure strip 4 to can be at different position installation adjusting bolt 6, and then set up the contact in different positions, with the measurement demand that satisfies the difference.
Further, the arc-shaped guide vane 8 is connected with the insulating block 7 through bonding.
Further, the convex surface of the arc-shaped guide vane 8 is connected with the test piece 10 through silver glue.
The resistance is measured by using a four-lead method, two current leads and at least two voltage leads are needed, and when the resistance between different points on a test piece is measured, the number of the leads can be increased to be used as additional voltage leads; the convenient joint for measuring the resistance by using the four-lead method disclosed by the embodiment 3 is used for measuring the resistance, and the specific steps are as follows:
(1) firstly, determining whether a current lead and/or a voltage lead exist in a piece to be tested, determining the number of leads according to measurement requirements, and further determining the number of convenient joints;
(2) preparing a contact: cutting the long-strip-shaped epoxy board into insulating blocks according to the required size, then adhering the insulating blocks with a copper sheet to enable the copper sheet to form an arched guide sheet, and then welding the arched guide sheet with a lead to obtain a contact; (ii) a
(3) Installation and adjustment: firstly, adhering a test piece on a low-temperature platform by using low-temperature glue; then, adhering the contact on the test piece by using silver adhesive; installing a bracket at a position corresponding to the contact, and installing an adjusting bolt for fixing each contact; the contact area between each contact and a piece to be tested is adjusted through the adjusting bolt 6, and silver colloid can be added in the process to reduce the contact resistance;
(4) after the installation and the adjustment are finished, the wires connected with the contacts are respectively connected into a current source and a nanovolt meter to measure the resistance;
example 4
The convenient joint for resistance measurement by the four-lead method disclosed in embodiment 1 is used for resistance measurement, and specifically comprises the following steps:
in the experiment of measuring the change of the resistance of the superconducting film along with the temperature by using the electric transportation method, the measured superconducting film has the size of 10 × 10mm2Therefore, the handy joint of the present invention is suitable for measuring the resistance of the superconducting thin film by the four-lead method.
The main structural parameters of the joint are as follows:
the stent material is as follows: an epoxy resin; the span of the bracket: 12 mm; the total height of the bracket is as follows: 10 mm; the arch height of the bracket is as follows: 4 mm; insulating block material: an epoxy resin; thickness of the insulating block: 2 mm; length of the insulating block: 5 mm; an arched guide sheet: red copper; width of the arcuate piece: 1.2 mm; thickness of the arch piece: 0.4 mm; arch height of the arch sheet: 1 mm; contact pitch: 1.2 mm.
The contact processing, the joint mounting and dismounting steps are as follows:
(1) preparing a contact:
when the contact is manufactured, the strip-shaped epoxy board is cut into the insulating blocks according to the required size, then the insulating blocks are bonded with the copper sheet, so that the copper sheet forms the arched guide sheet, and then the arched guide sheet is welded with the lead to obtain the contact.
(2) Installation:
firstly, adhering a test piece on a low-temperature platform by using low-temperature glue; then, sequentially adhering the four contacts on the test piece by using silver adhesive; a mounting bracket for fixing each contact; the contact surfaces of the contacts and the superconducting film are adjusted through the adjusting bolts, and the silver colloid can be added in the process, so that the contact resistance is reduced; and after the adjustment is finished, connecting the wires connected with the four contacts into a current source and a nanovolt meter respectively.
(3) Disassembling:
after the experiment is finished, the support is taken down firstly, and then the four contacts are disassembled in sequence. When the contact is disassembled, the silver colloid needs to be dissolved by an organic solvent. And after the contacts are completely removed, the test piece is detached from the low-temperature platform.
The joint is used for measuring the RT curve of the resistance of the superconducting thin film along with the temperature change, and the results of two measurements are shown in the attached figures 4 and 5, and the stability of the joint is illustrated. Fig. 6 shows the RT curve of the same superconducting thin film measured by the conventional four-lead method, and the result is slightly different from the resistance value before transition of the curves of fig. 4 and 5 because the voltage extraction points of the two experiments are different.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the examples shown herein, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several modifications and decorations within the scope of the invention are possible to those skilled in the art without departing from the principle of the invention.
Claims (6)
1. A convenient joint for resistance measurement by a four-lead method is characterized in that a to-be-tested piece is fixed on a test platform in the resistance measurement process, and then measurement is carried out by a measuring device; the device is characterized by comprising a support and a contact, wherein the support is connected with the test platform, the contact is connected with the test piece, and the support tightly presses the contact on the test piece;
the support comprises a platform connecting part and a contact pressing part, the platform connecting part is detachably connected with the test platform, and the contact pressing part is contacted with the contact;
the contact comprises an insulating block, an arched guide vane and a lead; the insulating block is contacted with the contact pressing part; the concave surface of the arched guide piece is connected with the insulating block, the convex surface of the arched guide piece is connected with the test piece, and the arched guide piece is connected with one end of a lead; the other end of the wire is connected with the measuring device.
2. The easy connection for four-lead resistance measurement according to claim 1, wherein the platform connection portion is connected to the test platform by bonding, riveting or bolting.
3. The convenient joint for resistance measurement by the four-lead method according to claim 1, wherein the contact pressing portion comprises an adjusting bolt, and the bottom of the adjusting bolt is in contact with the contact.
4. A convenient joint for four-lead resistance measurement according to claim 1, wherein the arcuate tabs are bonded, riveted or bolted to the insulator block.
5. The convenient joint for resistance measurement by the four-lead method according to claim 1, wherein the contact and the test piece are connected by silver adhesive.
6. A handy joint for resistance measurement by four-lead method according to any one of claims 1 to 5, characterized in that the handy joint comprises a bracket and four contacts; the bracket is of an integrated structure and comprises a platform connecting part and a contact pressing part; the platform connecting part consists of two connecting plates corresponding to each other in position, and the connecting plates are respectively connected with the test platform through bolts; the contact pressing part comprises a pressing plate and two supporting plates, one end of each of the two supporting plates is vertically connected with one end of each of the two connecting plates, the two ends of each of the pressing plates are vertically connected with one end, far away from the connecting plate, of each of the two supporting plates, a screw hole is formed in each of the pressing plates, an adjusting bolt is installed in each screw hole, and the bottom of each adjusting bolt is in contact with the contact; the contact comprises an insulating block, an arched guide vane and a wire, the insulating block is of a rectangular structure, and the top surface of the insulating block is in contact with the bottom of the adjusting bolt; the concave surface of the arched guide piece is connected with the bottom surface of the insulating block, the convex surface of the arched guide piece is connected with the test piece, the arched guide piece is connected with one end of the lead in a welding mode, and the other end of the lead is connected with the measuring device.
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| CN201711189294.7A CN107741511B (en) | 2017-11-24 | 2017-11-24 | Convenient joint for resistance measurement by four-lead method |
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| CN201711189294.7A CN107741511B (en) | 2017-11-24 | 2017-11-24 | Convenient joint for resistance measurement by four-lead method |
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| CN110068712A (en) * | 2019-04-28 | 2019-07-30 | 昆明理工大学 | A kind of four probe tester of buckle-type |
| CN114137312B (en) * | 2020-11-02 | 2023-12-22 | 国网冀北电力有限公司检修分公司 | Loop resistance test assembly |
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| CN107741511A (en) | 2018-02-27 |
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