Resistance test assembly, test circuit board and test system

Abstract

The utility model discloses a resistor test assembly, a test circuit board and a test system, the assembly comprises a test circuit board, the test circuit board is provided with a fixing member, a first plug interface and a second plug interface, and the fixing member is used for fixing a resistor to be tested; the testing tool comprises a current measuring unit and a voltage measuring unit; wherein the current measuring unit is used for being electrically connected with the first plug interface so as to form a current detection loop with the resistor to be measured; the voltage measuring unit is used for being electrically connected with the second plugging port so as to form a voltage detection loop with the to-be-detected resistor. In this way, the measurement precision of the to-be-measured resistor can be improved.

Description

Technical Field

[0001] This application relates to the technical field of resistance testing, and particularly to a resistance testing component, a testing circuit board, and a testing system. Background Art

[0002] When developing and designing hardware products, the selection of resistance devices (mainly including resistance value, accuracy, maximum voltage, temperature drift coefficient, etc.) will be considered; during subsequent product verification, the testing work of resistance materials of different specifications will be mainly involved. Among them, during the verification process, how to ensure the accuracy of the resistance material test results has great guiding significance for the selection of resistance devices. Summary of the Utility Model

[0003] The main technical problem to be solved by this application is to provide a resistance testing component, a testing circuit board, and a testing system, which can improve the measurement accuracy of the resistance to be tested.

[0004] To solve the above technical problem, a technical solution adopted by this application is: to provide a resistance testing component, which includes: a testing circuit board, on which a fixing member, a first socket, and a second socket are arranged, and the fixing member is used to fix the resistance to be tested; a testing tooling, including a current measurement unit and a voltage measurement unit; wherein, the current measurement unit is used to be electrically connected to the first socket to form a current detection loop with the resistance to be tested; the voltage measurement unit is used to be electrically connected to the second socket to form a voltage detection loop with the resistance to be tested.

[0005] Wherein, the fixing member is arranged on the surface of the testing circuit board, and the fixing member is provided with at least one fixing position, and different fixing positions are used to fix different models of the resistance to be tested.

[0006] Wherein, different fixing positions are arranged side by side along the target direction, and the target direction is the length direction or the width direction of the testing circuit board; and / or the fixing position is in the shape of a groove.

[0007] Wherein, the fixing member is arranged on the surface of the testing circuit board, and the first socket and the second socket are arranged on the side surface of the testing circuit board close to the fixing member in the length direction or the width direction.

[0008] Wherein, the second socket is located between the first socket and the fixing member; the number of both the first socket and the second socket is two.

[0009] Among them, the current measurement unit includes a power supply and an ammeter, and the voltage measurement unit includes a voltmeter; one end of the ammeter is electrically connected to one end of the power supply, and the other end of the ammeter is used to be electrically connected to one of the two first jacks, and the other end of the power supply is used to be electrically connected to the other of the two first jacks; one end of the voltmeter is electrically connected to one of the two second jacks, and the other end of the voltmeter is used to be electrically connected to the other of the two second jacks; the fixing member includes two connection ends, and different first jacks are respectively connected to the connection ends of the fixing member through the first wire and the second wire on the test circuit board, and different second jacks are respectively connected to the connection ends of the fixing member through the third wire and the fourth wire on the test circuit board.

[0010] Among them, the current measurement unit further includes a fuse provided between the power supply and the ammeter.

[0011] Among them, the current measurement unit includes a power supply and an ammeter, and the voltage measurement unit includes a voltmeter for measuring the voltage of the resistor to be measured; the power supply is a regulated voltage source; the regulated voltage source is used to provide a measurement voltage matching the resistor to be measured.

[0012] To solve the above technical problems, another technical solution adopted by this application is: to provide a test circuit board, the test circuit board is provided with a fixing member, a first jack and a second jack, the fixing member is used to fix the resistor to be measured, and the test circuit board is used to be electrically connected to the test tooling.

[0013] To solve the above technical problems, yet another technical solution adopted by this application is: to provide a resistor test system, including: a resistor test component and a constant temperature box, the resistor test component includes a test circuit board and a test tooling, the test tooling includes a current measurement unit and a voltage measurement unit, the test circuit board is provided with a fixing member, a first jack and a second jack, and the fixing member is used to fix the resistor to be measured; the test circuit board is located inside the constant temperature box, the test tooling is located outside the constant temperature box, the current measurement unit is electrically connected to the first jack to form a current detection loop with the resistor to be measured, and the voltage measurement unit is electrically connected to the second jack to form a voltage detection loop with the resistor to be measured.

[0014] The above-mentioned resistance test component of the present application includes a test circuit board and a test tooling; wherein, a fixing member for fixing the resistance to be tested, a first insertion interface, and a second insertion interface are provided on the test circuit board, and the test tooling includes a current measurement unit and a voltage measurement unit. Among them, the current measurement unit is used to be electrically connected to the first insertion interface to form a current detection loop with the resistance to be tested, and the voltage measurement unit is used to be electrically connected to the second insertion interface to form a voltage detection loop with the resistance to be tested. The resistance test component in the present application combines the current measurement unit and the voltage measurement unit into a test tooling, and uses the test tooling to form a current detection loop and a voltage detection loop with the resistance to be tested respectively, improving the convenience of testing the current and voltage of the resistance to be tested; in addition, the fixing member provided on the test circuit board can fix the resistance to be tested, reducing the measurement error caused by the movement of the resistance to be tested; further, the first insertion interface and the second insertion interface are provided on the test circuit board, that is, the positions of the first insertion interface and the second insertion interface on the test circuit board are fixed. Therefore, when using the test tooling to measure the current and voltage of the resistance to be tested, the positions of the connections between the test tooling and the resistance to be tested are the same. Compared with the method of using alligator clips or probes to contact the wires on both sides of the resistance to be tested, the above-mentioned method of fixing the connection position in the present application can effectively reduce the measurement error caused by different contact positions, and thus can improve the measurement accuracy of the resistance to be tested. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of an embodiment of the resistance test component provided by the present application;

[0016] Figure 2 is a schematic structural diagram of another embodiment of the resistance test component provided by the present application;

[0017] Figure 3 is a schematic framework diagram of an embodiment of the resistance test system provided by the present application. Detailed Embodiments

[0018] To make the purpose, technical solutions and effects of the present application clearer and more definite, the following further describes the present application in detail with reference to the accompanying drawings and by way of examples.

[0019] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0020] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of a resistance test component provided by the present application. As Figure 1 shown, the resistance test component 100 includes a test circuit board 10 and a test tooling 20. A fixing member 11, a first socket 12 and a second socket 13 for fixing a resistance to be tested are arranged on the test circuit board 10. The test tooling 20 includes a current measuring unit and a voltage measuring unit. Among them, the current measuring unit is used to be electrically connected to the first socket 12 to form a current detection loop with the resistance to be tested, and the voltage measuring unit is used to be electrically connected to the second socket 13 to form a voltage detection loop with the resistance to be tested.

[0021] In the resistance test component 100 of this embodiment, the current measuring unit and the voltage measuring unit are combined into the test tooling 20. The test tooling 20 is respectively used to form a current detection loop and a voltage detection loop with the resistance to be tested, which improves the convenience of measuring the current and voltage of the resistance to be tested; in addition, the fixing member 11 arranged on the test circuit board 10 can fix the resistance to be tested, and the measurement error caused by the movement of the resistance to be tested can be reduced; further, the first socket 12 and the second socket 13 are arranged on the test circuit board 10, that is, the positions of the first socket 12 and the second socket 13 on the test circuit board 10 are fixed. Therefore, when the test tooling 20 is used to measure the current and voltage of the resistance to be tested, the positions of the connection points between the test tooling 20 and the resistance to be tested are the same. Compared with the method of using alligator clips or probes to contact the two sides of the wire of the resistance to be tested, the method of fixing the connection point positions in this embodiment can effectively reduce the measurement error caused by different contact positions, and thus can improve the measurement accuracy of the resistance to be tested.

[0022] Further, since the resistance to be tested in this case can be fixed on the fixing member 11, and the test tooling 20 forms a current measurement loop and a voltage measurement loop with the resistance to be tested through the first socket 12 and the second socket 13 fixed on the test circuit board 10, even for different resistances, or the same resistance tested at different times, no other errors will be introduced into the test results. Based on this, before testing the resistance to be tested, a resistance with high precision can be used for testing first, and then the error introduced by the resistance test component can be calculated by comparing the test results with the accurate parameters of this resistance. Then, during the subsequent testing of the resistance to be tested, the measurement result of the resistance to be tested can be calibrated by using the introduced error to further improve the accuracy of the test.

[0023] Please continue to refer to Figure 1, in some embodiments, the fixing member 11 is provided on the surface of the test circuit board 10, specifically, on the upper surface of the test circuit board 10. The fixing member 11 is provided with at least one fixing position 111, and different fixing positions 111 are used to fix resistors of different models to be tested. Exemplarily, fixing positions 111 suitable for fixing resistors with a length of 4 mm and a width of 2 mm, a length of 6 mm and a width of 3 mm, a length of 8 mm and a width of 5 mm, a length of 12 mm and a width of 6 mm, etc. can be respectively set. The specific number and size of the fixing positions 111 can be set according to actual measurement needs.

[0024] Optionally, different fixing positions 111 are arranged side by side in the target direction. Among them, the target direction can be the length direction of the test circuit board 10 or the width direction of the test circuit board 10. It can be specifically set according to the actual situation. In addition, the shape of the fixing position 111 is a groove shape, which can be but is not limited to a square groove shape, etc., so that the resistor to be tested can be fixed in position by being placed in the groove.

[0025] Please continue to refer to Figure 1 , in some embodiments, the first socket 12 and the second socket 13 are provided on the side surface of the test circuit board 10 close to the fixing member 11 in the length direction or the width direction.

[0026] Among them, in order to improve the accuracy of resistor measurement, the second socket 13 can be set between the first socket 12 and the fixing member 11. Further, the first socket 12 and the second socket 13 can be made as close to the fixing member 11 as possible to reduce the influence of the resistance of the wire itself on the measurement of the resistor to be tested.

[0027] In this embodiment, in order to form the above-mentioned current measurement loop and voltage measurement loop, and the current measurement loop and the voltage measurement loop are independent of each other, two first sockets 12 and two second sockets 13 can be set.

[0028] Further, please continue to refer to Figure 1 , the current measurement unit includes a power supply and an ammeter, and the voltage measurement unit includes a voltmeter. One end of the ammeter is electrically connected to one end of the power supply, and the other end of the ammeter is used to be electrically connected to one of the two first sockets 12, and the other end of the power supply is used to be electrically connected to the other of the two first sockets 12; and the fixing member 11 includes two connection ends, and different first sockets 12 are respectively connected to the connection ends of the fixing member 11 through the first wire and the second wire on the test circuit board 10, so that when the other end of the ammeter is electrically connected to one of the first sockets 12 and the other end of the power supply is electrically connected to the other first socket 12, a current measurement loop can be formed, and further the measurement of the current of the resistor to be tested can be realized.

[0029] In addition, one end of the voltmeter is electrically connected to one of the two second jacks 13, and the other end of the voltmeter is used to be electrically connected to the other of the two second jacks 13. Different second jacks 13 are respectively connected to the connection ends of the fixing member 11 through the third wire and the fourth wire on the test circuit board 10, so that when both ends of the voltmeter are electrically connected to the respective second jacks 13, a voltage measurement circuit can be formed to measure the voltage of the resistor under test, and then the measured resistance value of the resistor under test can be obtained by using the measured voltage and the measured current of the resistor under test.

[0030] In some embodiments, please refer to Figure 2 , Figure 2 which is a schematic structural diagram of another embodiment of the resistor test component provided by the present application. In this embodiment, the current measurement unit further includes a fuse disposed between the power supply and the ammeter, and the fuse is used to reduce the risk of burning out the ammeter or reducing the influence on the measurement accuracy of the ammeter when testing resistors under test with different resistance values before and after. When testing a resistor under test with a relatively small resistance value directly under the test conditions of a resistor under test with a relatively large resistance value, the fuse can play a role in protection.

[0031] It should be noted that the inventors of the present application have found in the long-term research process that during the measurement of the resistor under test, if the ratio of the measured voltage of the resistor under test to the resistor under test is within a certain ratio range, the difference between the measured resistance value of the resistor under test and the rated resistance value of the resistor under test is smaller, and the test result is more accurate.

[0032] Furthermore, even for a resistor under test with a rated resistance less than 300 ohms, after fixing the resistor under test on the fixing member 11 of the test circuit board 10 and placing the test circuit board 10 in a constant temperature oven at a relatively high temperature (155 - 160 degrees Celsius), the difference between the measured resistance of the resistor under test measured by using the above test tooling 20 and the rated resistance value of the resistor under test is very small (through experimental comparison, it is equivalent to the test result of the existing relatively expensive six and a half digit multimeter, and even higher than the accuracy of the test result of the six and a half digit multimeter). Moreover, the difference between the temperature coefficient of the resistor under test measured by the six and a half digit multimeter and the temperature coefficient measured by using the above method of the present application is also very small and can be ignored.

[0033] In a specific test, the rated resistance of the resistor under test is 60.4 ohms, the temperature coefficient is less than or equal to ±100 ppm / °C, the test temperature is 125°C. Under the test condition that the measured voltage of the resistor under test in the above test fixture 20 is adjusted to 61.5% of the rated voltage, the measured resistance value is 61.3913, and the measured temperature coefficient is 87.06603877; without adjusting the measured voltage of the resistor under test, the resistance value measured by a high-precision six-and-a-half-digit multimeter is 61.6522, and the measured temperature coefficient is 89.94873105.

[0034] Therefore, in some embodiments, to further improve the accuracy of resistance measurement, the above power supply can be set as an adjustable voltage source. Among them, the adjustable voltage source is used to provide a measurement voltage matching the resistor under test. Among them, the ratio of the measurement voltage matching the resistor under test to the rated voltage of the resistor under test satisfies a preset ratio. Optionally, the preset ratio is 30%-80%; preferably, the preset ratio is 40%-70%. Among them, the adjustable voltage source can adjust the measurement voltage provided by the adjustable voltage source by using the set adjustment knob.

[0035] It should be noted that in the case where the above current measurement unit includes an adjustable voltage source, a fuse, and an ammeter, the fuse can also reduce the phenomenon that the resistor under test is burned out due to excessive voltage adjustment.

[0036] In addition, it is found through experiments that the above resistance test component 100 of the present application can accurately measure the resistor under test in a test ambient temperature range of -60°C to 160°C.

[0037] Exemplarily, please refer to Table 1. Table 1 is the comparison data of the measurement data using the resistance measurement component provided by the present application and the measurement data using a high-precision six-and-a-half-digit multimeter:

[0038] Table 1

[0039]

[0040]

[0041] Please refer to Figure 3 , Figure 3It is a schematic framework diagram of an embodiment of the resistance testing system provided by this application. In this embodiment, the testing system 300 includes a resistance testing component 100 and a thermostat 200. Among them, the testing tooling 20 includes a current measurement unit and a voltage measurement unit. On the testing circuit board 10, there are a fixing member 11, a first socket 12 and a second socket 13. The fixing member 11 is used to fix the resistance to be tested. The testing circuit board 10 is located inside the thermostat, and the testing tooling 20 is located outside the thermostat. The current measurement unit is electrically connected to the first socket 12 to form a current detection loop with the resistance to be tested, and the voltage measurement unit is electrically connected to the second socket 13 to form a voltage detection loop with the resistance to be tested.

[0042] Among them, the thermostat 200 is used to adjust the test ambient temperature of the resistance to be tested, and the test ambient temperature is -60 degrees Celsius to 160 degrees Celsius.

[0043] It should be noted that the first socket and the second socket provided on the testing circuit board 10 in this embodiment can form a current measurement loop and a voltage measurement loop between the testing tooling 20 and the resistance to be tested in the thermostat through the first socket and the second socket during the measurement of the resistance to be tested in the thermostat.

[0044] The above resistance testing component of this application includes a testing circuit board and testing tooling. Among them, on the testing circuit board, there are a fixing member for fixing the resistance to be tested, a first socket and a second socket. The testing tooling includes a current measurement unit and a voltage measurement unit. Among them, the current measurement unit is used to be electrically connected to the first socket to form a current detection loop with the resistance to be tested, and the voltage measurement unit is used to be electrically connected to the second socket to form a voltage detection loop with the resistance to be tested. The resistance testing component in this application combines the current measurement unit and the voltage measurement unit into the testing tooling, and uses the testing tooling to form a current detection loop and a voltage detection loop with the resistance to be tested respectively, which improves the convenience of testing the current and voltage of the resistance to be tested. In addition, the fixing member provided on the testing circuit board can fix the resistance to be tested, which can reduce the measurement error caused by the movement of the resistance to be tested. Further, the first socket and the second socket are provided on the testing circuit board, that is, the positions of the first socket and the second socket on the testing circuit board are fixed. Therefore, when using the testing tooling to measure the current and voltage of the resistance to be tested, the positions of the connections between the testing tooling and the resistance to be tested are the same. Compared with the method of using alligator clips or probes to contact the two sides of the wire of the resistance to be tested, the above method of fixing the connection position in this application can effectively reduce the measurement error caused by different contact positions, and thus can improve the measurement accuracy of the resistance to be tested.

[0045] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. Their similarities or similarities can be referred to each other. For the sake of brevity, they will not be elaborated in this article.

[0046] The above are only the embodiments of the present application, and do not thus limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present application.

Claims

1. A resistance test assembly, characterized in that: The components include: A test circuit board, on which a fixing member, a first plug interface and a second plug interface are provided, wherein the fixing member is used to fix the resistor to be tested; The test tool comprises a current measuring unit and a voltage measuring unit; wherein the current measuring unit is used to be electrically connected to the first plug interface to form a current detection loop with the resistor to be measured; and the voltage measuring unit is used to be electrically connected to the second plug interface to form a voltage detection loop with the resistor to be measured.

2. The assembly according to claim 1, characterized in that The fixing member is arranged on the surface of the test circuit board, and the fixing member is provided with at least one fixing position, and different fixing positions are used to fix resistors to be tested of different types.

3. The assembly according to claim 2, characterized in that The different fixing positions are arranged in parallel along a target direction, and the target direction is a length direction or a width direction of the test circuit board; And / or, the fixing position is in the shape of a groove.

4. The assembly according to claim 1, characterized in that The fixing member is arranged on the surface of the test circuit board, and the first plugging interface and the second plugging interface are arranged on the side of the test circuit board close to the fixing member in the length direction or the width direction.

5. The assembly according to claim 4, characterized in that The second plug interface is located between the first plug interface and the fixing member; and the number of the first plug interface and the number of the second plug interface are both two.

6. The assembly according to claim 5, characterized in that The current measuring unit includes a power supply and an ammeter, and the voltage measuring unit includes a voltmeter; One end of the ammeter is electrically connected to one end of the power supply, and the other end of the ammeter is used to be electrically connected to one of the two first plug interfaces, and the other end of the power supply is used to be electrically connected to the other of the two first plug interfaces; one end of the voltmeter is electrically connected to one of the two second plug interfaces, and the other end of the voltmeter is used to be electrically connected to the other of the two second plug interfaces; The fixing member includes two connection ends, and the first plug interface is connected to each connection end of the fixing member through a first wire and a second wire on the test circuit board, and the second plug interface is connected to each connection end of the fixing member through a third wire and a fourth wire on the test circuit board.

7. The assembly according to claim 6, characterized in that The current measuring unit further includes a fuse disposed between the power source and the ammeter.

8. The assembly according to claim 1, characterized in that The current measuring unit includes a power supply and an ammeter, and the voltage measuring unit includes a voltmeter for measuring the voltage of the resistor to be measured; The power supply is a regulated voltage source; the regulated voltage source is used to provide a measurement voltage that matches the resistance to be measured.

9. A test circuit board, characterized in that: The test circuit board is provided with a fixing part, a first plug interface and a second plug interface. The fixing part is used to fix the resistor to be tested, and the test circuit board is used to be electrically connected to the test tooling.

10. A resistance testing system, characterized in that: The system comprises: A resistance test assembly and a constant temperature box, wherein the resistance test assembly includes a test circuit board and a test fixture, wherein the test fixture includes a current measuring unit and a voltage measuring unit, and the test circuit board is provided with a fixing member, a first plug interface and a second plug interface, wherein the fixing member is used to fix the resistance to be tested; The test circuit board is located inside the constant temperature box, the test tool is located outside the constant temperature box, the current measuring unit is electrically connected to the first plug interface to form a current detection loop with the resistor to be measured, and the voltage measuring unit is electrically connected to the second plug interface to form a voltage detection loop with the resistor to be measured.

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