Temperature coefficient testing tool and system

Abstract

The utility model relates to the technical field of temperature coefficient measurement, in particular to a temperature coefficient test tool and system, which comprises a test board, a band switch and a connecting line which are placed in a high-low temperature test box during test, the test board placed in the high and low temperature test box is connected with the wave band switch through a connecting line during testing; the test plate comprises a fixed plate, a grounding plate and a test port. The connecting wire is a shielding wire and comprises a core wire, an insulating layer located on the periphery of the core wire and a shielding layer located on the periphery of the insulating layer. A first end of a core wire of the connecting wire is electrically connected with the test port, and a second end of the core wire is electrically connected with at least one gear knob of the band switch; the shielding layer of the connecting line is fixed on the grounding plate. According to the utility model, the measurement accuracy and the measurement efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature coefficient measurement, in particular to a temperature coefficient testing tool and system. Background Art

[0002] The temperature coefficient is a key parameter indicative of sample material performance. Testing requires measuring the change in a product's inductance or capacitance at different temperatures and calculating the temperature coefficient. Currently, temperature coefficient measurements are performed using a temperature test chamber and an inductance / capacitance tester. The test piece is then connected to aviation or enameled wire and directly led out of the chamber for testing. This method can only measure one temperature coefficient per sample at a time, making it inefficient. Incorporating other test fixtures can introduce significant errors, significantly impacting test results.

[0003] Therefore, there is an urgent need for a temperature coefficient testing tool and system. Utility Model Content

[0004] (1) Technical issues to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a temperature coefficient testing tool and system, which solves the technical problem of being unable to measure the temperature coefficients of multiple products at the same time, improves the measurement efficiency, and increases the measurement accuracy.

[0006] (2) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0008] In a first aspect, an embodiment of the present invention provides a temperature coefficient test tool, comprising:

[0009] The test board, band switch, and connecting wires are placed in a high and low temperature test chamber during testing;

[0010] During the test, the test board placed in the high and low temperature test chamber is connected to the band switch via a connecting line;

[0011] The test board includes: a fixing plate, a grounding plate and a test port;

[0012] The connecting wire is a shielded wire, comprising: a core wire, an insulating layer located outside the core wire, and a shielding layer located outside the insulating layer;

[0013] The first end of the core wire of the connecting wire is electrically connected to the test port, and the second end is electrically connected to at least one gear knob of the band switch; the shielding layer of the connecting wire is fixed on the ground plate.

[0014] Optionally, the length and width of the fixing plate are both smaller than the length and width of the high and low temperature test chamber;

[0015] The fixing plate is provided with a plurality of test ports, and the sum of the lengths of all the test ports is less than the length of the fixing plate.

[0016] Optionally, the test board further comprises: a wire fixing clamp; the wire fixing clamp is arranged on the fixing plate;

[0017] The connecting wires are fixed via wire fixing clips and then electrically connected to the different gear knobs of the band switch in sequence.

[0018] Optionally, the test tool further includes:

[0019] Ground wire;

[0020] One end of the grounding wire is fixed to the grounding plate, and the other end is grounded.

[0021] Optionally, the test port includes: a first calibration port, a second calibration port, a first open port, a second open port and N sample test ports;

[0022] The N is an even number greater than or equal to 2.

[0023] Optionally, the test fixture further comprises: a calibration line;

[0024] The calibration line is a shielded line; one end of the calibration line is electrically connected to the first calibration port, and the other end of the calibration line is electrically connected to the second calibration port.

[0025] Optionally, the N sample test ports are grouped in pairs, and the first sample test port in each group of sample test ports is electrically connected to a first test end of the sample, and the second sample test port is electrically connected to a second test end of the sample.

[0026] Optionally, the connecting wires are grouped in pairs, and the second end of each connecting wire in each group of connecting wires is electrically connected to the gear knob corresponding to the band switch;

[0027] The number of band switch positions is greater than or equal to half the number of test ports.

[0028] In a second aspect, an embodiment of the present invention provides a temperature coefficient testing system, comprising:

[0029] Temperature coefficient test fixtures, test instruments, and high and low temperature test chambers;

[0030] The test instrument is electrically connected to the temperature coefficient test fixture; the test board of the temperature coefficient test fixture is placed in the high and low temperature test chamber during testing;

[0031] The temperature coefficient test tool is any of the temperature coefficient test tools described above; the test instrument is a capacitance tester or an inductance tester.

[0032] Optionally, the temperature control range of the high and low temperature test box is -70°C to 150°C.

[0033] (3) Beneficial effects

[0034] The beneficial effects of the present invention are as follows: a temperature coefficient testing tool and system of the present invention, due to the provision of a test board and N sample test ports on the test board, and the addition of open circuit calibration and short circuit calibration, can measure the temperature coefficients of multiple products at the same time compared to the prior art, and can also reduce measurement errors, thereby increasing measurement accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of a temperature coefficient test fixture according to an embodiment of the present utility model;

[0036] Figure 2 This is a schematic diagram of a temperature coefficient testing system according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of connecting wires in a temperature coefficient testing tool in an embodiment of the present invention.

[0038] [Description of Reference Numerals]

[0039] 1: First calibration port; 2: Second calibration port; 3: First open-circuit port; 4: Second open-circuit port; 5: Sample test port; 6: Calibration line; 7: Fixing plate; 8: Grounding plate; 9: Grounding wire; 10: Wire fixing clamp; 11: Band switch; 12: Test instrument; 13: Insulation layer; 14: Shielding layer; 15: Core wire. DETAILED DESCRIPTION

[0040] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0041] The present invention proposes a temperature coefficient test fixture and system. In order to solve the technical problem of low efficiency in measuring the sample temperature coefficient, a temperature coefficient test fixture is introduced, and multiple sample test ports are set on the test board. At the same time, grounding, open circuit calibration and short circuit calibration are set, which reduces measurement errors and improves measurement efficiency.

[0042] To better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0043] Specific embodiment description part

[0044] Example 1

[0045] See also Figure 1 A temperature coefficient test tool according to an embodiment of the present invention includes:

[0046] During the test, the test board, band switch 11, and connecting wires are placed in the high and low temperature test chamber;

[0047] During the test, the test board placed in the high and low temperature test chamber is connected to the band switch 11 via a connecting line;

[0048] The test board includes: a fixing plate 7, a grounding plate 8 and a test port;

[0049] See also Figure 3 The connecting wire is a shielded wire, comprising: a core wire 15, an insulating layer 13 located outside the core wire 15, and a shielding layer 14 located outside the insulating layer 13;

[0050] A first end of the core wire 15 of the connecting wire is electrically connected to the test port, and a second end is electrically connected to at least one gear knob of the band switch 11 ; a shielding layer 14 of the connecting wire is fixed on the grounding plate 8 .

[0051] In the specific implementation process, the length of the innermost core wire 15 of the connecting wire is greater than the length of the outer insulating layer 13 and the shielding layer 14, and the core wire 15 slightly extends out of the insulating layer 13 and the shielding layer 14. Through such a design, the core wire 15 can first contact the test port and the band switch 11 during the connection process, thereby reducing the physical impact on the shielding layer 14; at the same time, the extension of the core wire 15 can ensure the establishment of a stable and reliable electrical connection. If the insulating layer 13 and the shielding layer 14 are the same length as the core wire 15, it may cause the core wire 15 to have insufficient space to fully enter the electrical connection contacts, thereby affecting the quality of the electrical connection.

[0052] In this embodiment, the outermost shielding layer 14 of the connecting wire is fixed at one point on the grounding plate 8 .

[0053] In this embodiment, by providing a fixing plate 7, the entire test tooling is made stable and convenient for placement and operation in a high and low temperature test chamber; and by providing a grounding plate 8, a stable grounding point can be provided to ensure electrical safety and minimize signal interference during the test process.

[0054] In a specific implementation process, by setting the connecting wire as a shielded wire, the shielding layer 14 located outside the insulating layer 13 in the shielded wire can effectively block external electromagnetic interference.

[0055] In this embodiment, the length and width of the fixing plate 7 are both smaller than the length and width of the high and low temperature test chamber.

[0056] The fixing plate 7 is provided with a plurality of test ports, and the sum of the lengths of all the test ports is smaller than the length of the fixing plate 7 .

[0057] For example, when the high and low temperature test box is 70 cm long and 40 cm wide, and there are 10 test ports, the sum of the lengths of all test ports is 50 cm. At this time, the length range of the fixing plate 7 is 50 cm to 70 cm, and the width is less than 40 cm.

[0058] In a specific application process, the test board further includes: a wire fixing clamp 10; the wire fixing clamp 10 is arranged on the fixing plate 7;

[0059] The connecting wires are fixed via the wire fixing clamp 10 and are electrically connected to the different gear knobs of the band switch 11 in sequence.

[0060] In this embodiment, by providing the wire fixing clamp 10, the connecting wires can be effectively organized and fixed, preventing the wires from becoming entangled with each other due to looseness or swinging during the test process, thereby keeping the test tooling neat and orderly.

[0061] At the same time, during the test process, the connecting wires may expand and contract due to changes in high and low temperatures. The wire fixing clamp 10 can help maintain the fixed position of the connecting wires, prevent the connecting wires from contacting other components or the walls of the high and low temperature test chamber, reduce the risk of accidental short circuits or damage, and thus improve the safety of the test tooling.

[0062] In the specific implementation process, the test tooling also includes:

[0063] Ground wire 9.

[0064] One end of the grounding wire 9 is fixed to the grounding plate 8 and the other end is grounded.

[0065] In this embodiment, by providing the grounding wire 9, the influence of electromagnetic interference and electrical noise on the test results can be reduced, thereby improving the accuracy and stability of the test data and making the test results more accurate and reliable.

[0066] In this embodiment, the test ports include: a first calibration port 1 , a second calibration port 2 , a first open port 3 , a second open port 4 and N sample test ports 5 .

[0067] N is an even number greater than or equal to 2.

[0068] In this embodiment, the testing tool further includes a calibration line 6 .

[0069] The calibration line 6 is a shielded line; one end of the calibration line 6 is electrically connected to the first calibration port 1 , and the other end is electrically connected to the second calibration port 2 .

[0070] In this embodiment, by setting a calibration line 6 between the first calibration port 1 and the second calibration port 2 to form a short circuit, and forming an open circuit between the first open port 3 and the second open port 4, the measurement accuracy of the temperature coefficient test tool can be effectively improved, errors can be eliminated, and the reliability and consistency of the data can be ensured.

[0071] In a specific implementation process, the N sample test ports 5 are grouped in pairs, and the first sample test port of each group of sample test ports 5 is electrically connected to the first test end of the sample, and the second sample test port is electrically connected to the second test end of the sample.

[0072] The connecting wires are grouped in pairs, and the second end of each connecting wire in each group of connecting wires is electrically connected to the gear knob corresponding to the band switch 11.

[0073] The number of gear positions of the band switch 11 is greater than or equal to half the number of test ports.

[0074] For example, a temperature coefficient test fixture has 10 sample test ports, or five groups of sample test ports, capable of simultaneously measuring the temperature coefficients of five samples. During testing, the two sample test ports in each group are connected to the two test ends of the sample, respectively.

[0075] The temperature coefficient test fixture in this embodiment is used to measure the temperature coefficients of products such as soft ferrite materials, metal magnetic powder core materials, and capacitor materials. It can also be used to measure the performance parameters of transformers and inductors at different temperatures.

[0076] A temperature coefficient testing tool of this embodiment can improve measurement efficiency and measurement accuracy at the same time.

[0077] Example 2

[0078] See also Figure 2 A temperature coefficient testing system according to an embodiment of the present invention includes:

[0079] Temperature coefficient test fixture, test instrument 12 and high and low temperature test chamber;

[0080] The test instrument 12 is electrically connected to the temperature coefficient test fixture; the test board of the temperature coefficient test fixture is placed in a high and low temperature test chamber during testing;

[0081] The temperature coefficient test tool is any one of the temperature coefficient test tools described in Example 1; the test instrument 12 is a capacitance tester or an inductance tester.

[0082] The temperature control range of the high and low temperature test chamber is -70℃~150℃.

[0083] In this embodiment, the test board of the temperature coefficient test fixture is placed in a high and low temperature test chamber during testing to achieve measurement of the temperature coefficient of the product at different temperatures.

[0084] The temperature coefficient testing system of this embodiment is low-cost and can simultaneously measure the characteristics of multiple products by using any temperature coefficient testing tool in Example 1, thereby improving measurement efficiency and increasing measurement accuracy.

[0085] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0086] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0087] In the present invention, unless otherwise expressly specified or limited, when a first feature is “above” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0088] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0089] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A temperature coefficient test tool, characterized in that: include: During the test, the test board, the band switch (11), and the connecting wires are placed in a high and low temperature test chamber; During testing, the test board is placed in a high and low temperature test box and connected to the band switch (11) via a connecting line; The test board comprises: a fixing plate (7), a grounding plate (8) and a test port; The connecting wire is a shielded wire, comprising: a core wire (15), an insulating layer (13) located outside the core wire (15), and a shielding layer (14) located outside the insulating layer (13); A first end of a core wire (15) of the connecting wire is electrically connected to the test port, and a second end is electrically connected to at least one gear knob of the band switch (11); a shielding layer (14) of the connecting wire is fixed on the grounding plate (8).

2. A temperature coefficient test fixture according to claim 1, characterized in that: The length and width of the fixing plate (7) are both smaller than the length and width of the high and low temperature test box; The fixing plate (7) is provided with a plurality of test ports, and the sum of the lengths of all the test ports is less than the length of the fixing plate (7).

3. A temperature coefficient test tool according to claim 1, characterized in that: The test plate further comprises: a wire fixing clamp (10); the wire fixing clamp (10) is arranged on the fixing plate (7); The connecting wire is fixed via a wire fixing clamp (10) and then electrically connected to the different gear knobs of the band switch (11) in sequence.

4. The temperature coefficient test tool according to claim 1, characterized in that: The test fixture also includes: Ground wire (9); One end of the grounding wire (9) is fixed on the grounding plate (8), and the other end is grounded.

5. The temperature coefficient test tool according to claim 2, characterized in that: The test port comprises: a first calibration port (1), a second calibration port (2), a first open-circuit port (3), a second open-circuit port (4), and N sample test ports (5); The N is an even number greater than or equal to 2.

6. The temperature coefficient test tool according to claim 5, characterized in that: The test fixture further comprises: a calibration line (6); The calibration line (6) is a shielded line; one end of the calibration line (6) is electrically connected to the first calibration port (1), and the other end is electrically connected to the second calibration port (2).

7. The temperature coefficient test tool according to claim 5, characterized in that: The N sample test ports (5) are grouped in pairs, and the first sample test port of each group of sample test ports (5) is electrically connected to the first test end of the sample, and the second sample test port is electrically connected to the second test end of the sample.

8. The temperature coefficient test tool according to claim 1, characterized in that: The connecting wires are arranged in groups of two, and the second end of each connecting wire in each group of connecting wires is connected to the gear knob corresponding to the band switch (11); The number of gear positions of the band switch (11) is greater than or equal to half the number of the test ports.

9. A temperature coefficient testing system, characterized in that: include: Temperature coefficient test fixture, test instrument (12) and high and low temperature test chamber; The test instrument (12) is electrically connected to the temperature coefficient test tool; The test board of the temperature coefficient test fixture is placed in the high and low temperature test chamber during testing; The temperature coefficient test tool is the temperature coefficient test tool according to any one of claims 1 to 8; the test instrument (12) is a capacitance tester or an inductance tester.

10. The temperature coefficient testing system according to claim 9, characterized in that: The temperature control range of the high and low temperature test box is -70°C to 150°C.

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