An electronic product test and measurement system precision calibration device

Abstract

The utility model discloses a kind of electronic product test measurement system precision calibration device, including with the upper test seat and lower test seat of test machine cooperation, detection groove is opened in the lower test seat middle part, still including simulation calibration plate made according to product to be detected, the upper test seat bottom is provided with and the contact of several test heads of the simulation calibration plate cooperation, detection, the simulation calibration plate is set in the detection groove;Simulation calibration plate is provided with four groups of detection parts, precision determination resistor is detachably arranged on the detection part, by using high-precision low-temperature drift high-power non-inductive resistance to make a profiled "false piece" of adaptive test fixture, to carry out data acquisition and calibration to test measurement system, the false piece is mainly adaptive different test interfaces provided by test equipment, to ensure that can complete evaluation entire test system, obtain real test system evaluation.

Description

Technical Field

[0001] This utility model relates to the field of electronic product testing and calibration technology, and in particular to an accuracy calibration device for electronic product testing and measurement systems. Background Technology

[0002] Test and measurement systems for electronic products (such as those for MOSFETs / IGBTs) generally consist of three important components (testing equipment): a host computer, source meters, and test fixtures. The host computer is the primary human-machine interface, determining the user's acceptance level. The accuracy of the source meters determines the upper limit of the test and measurement system's accuracy / stability. The test fixtures determine the actual performance of the test and measurement system. Test and measurement system designers must clearly understand that the accuracy of the source meters is greater than the accuracy of the fixtures / test fixtures. For example, most source meters on the market can be labeled with an accuracy of 0.01%, but the accuracy at the fixtures / test fixtures may only reach 0.5% or even 1%. To make the test and measurement system parameters look good, most suppliers emphasize the labeling of source meter parameters. When calibrating and verifying the equipment, the method used is to calibrate and verify from the output of the source meters. However, in reality, there will be some differences between the values ​​at the source meters and the performance at the fixtures / test fixtures. These differences are unacceptable in some high-precision measurements, causing users to be unable to accurately evaluate the true accuracy of the test system. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose an accuracy calibration device for electronic product testing and measurement system. By using a high-precision, low-temperature drift, high-power non-inductive resistor to create a shaped "dummy" that fits the test fixture, the device can be used to collect data and calibrate the testing and measurement system.

[0004] To achieve this objective, the present invention adopts the following technical solution: This utility model provides an accuracy calibration device for an electronic product testing and measurement system, including an upper test stand and a lower test stand that cooperate with a testing machine. The lower test stand has a detection slot in its center and also includes a simulation calibration board made according to the product to be tested. The bottom of the upper test stand has several test heads that cooperate with contacts on the simulation calibration board. During testing, the simulation calibration board is placed in the detection slot. The simulation calibration board has four sets of detection sections, namely, a high-side gate-source leakage current detection position, a high-side drain-source leakage current detection position, a low-side gate-source leakage current detection position, and a low-side drain-source leakage current detection position. The simulation calibration board also has detection contacts that cooperate with the four sets of detection sections. One end of the simulation calibration board has a power contact, and the other end has a detection mode switching contact. A precision determining resistor is detachably mounted on each detection section. The precision determining resistor is a high-precision, low-temperature drift, high-power, non-inductive resistor. The simulation calibration board also has a thermistor to monitor the temperature of the testing environment.

[0005] The detection position is provided with a socket slot at both ends, and the precision determining resistor is provided with a plug post at both ends that cooperates with the socket slot. After the plug post is inserted into the socket slot, the circuit connection on the simulation calibration board is completed.

[0006] The beneficial effects of this utility model are as follows: (1) Abandon the existing method of evaluating the equipment from the common end of the equipment (i.e., without including the error generated by the test fixture), and instead evaluate the equipment from the test end. Specifically, make a "dummy chip" that is similar in appearance to the product under test, i.e., a simulation calibration board. Use a high-precision, low-temperature drift, high-power non-inductive resistor to make a shaped "dummy chip" that is compatible with the test fixture. In this way, data acquisition and calibration of the test measurement system can be performed. The dummy chip is mainly compatible with the different test interfaces provided by the test equipment to ensure that the entire test system (including the error at the test fixture end) can be completely evaluated and a true test system evaluation can be obtained. (2) The precision determination resistor and circuit board in this case are more modular by using a plug-in method, which allows multiple measurements to be performed using a single simulation calibration board, increasing the comparison and ensuring the measurement effect. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of an accuracy calibration device for an electronic product testing and measurement system provided in a specific embodiment of this utility model; Figure 2 This is a schematic diagram of another perspective of the precision calibration device for an electronic product testing and measurement system provided in a specific embodiment of this utility model; Figure 3 This is a schematic diagram of the structural principle of the simulation calibration board after placement in a specific embodiment of this utility model; Figure 4 This is a schematic diagram of the structural principle of the simulation calibration board (without a precision-defined resistor) provided in a specific embodiment of this utility model; Figure 5 This is a schematic diagram illustrating the structural principle of the simulation calibration board provided in a specific embodiment of this utility model when replacing a resistor without precise determination.

[0008] In the picture: 1. Upper test socket; 11. Test head; 2. Lower test stand; 21. Detection slot; 3. Simulation calibration board; 31. Detection section; 32. Precision determining resistor; 33. Connecting slot; 321. Connecting post; HS-IGSS: High-side gate-source-drain current detection bit; HS-IDSS: High-side drain-source-drain current detection bit; LS-IGSS: Low-side gate-source-drain current detection bit; LS-IDSS: Low-side drain-source-drain current detection bit; AC: Detection mode switching contact; NTC: Thermistor. Detailed Implementation

[0009] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0010] To address the discrepancy between the values ​​at the source meter and the performance at the tooling / test end in practical applications—a discrepancy that is unacceptable in certain high-precision measurements and prevents users from accurately evaluating the true accuracy of the test system (i.e., the source meter error is not equal to the system error)—this invention provides an accuracy calibration device for electronic product test and measurement systems. It abandons existing methods that evaluate the equipment from its common end (i.e., excluding errors generated by the test fixture) and instead evaluates the equipment from the test end. This involves creating a "dummy chip" that closely resembles the product under test. Specifically, a high-precision, low-temperature drift, high-power non-inductive resistor is used to create a sculpted "dummy chip" adapted to the test fixture. This dummy chip is used to collect and calibrate data from the test and measurement system. It is primarily adapted to the different test interfaces provided by the test equipment to ensure a complete evaluation of the entire test system (including errors at the test fixture end), thus obtaining a true evaluation of the test system.

[0011] Further detailed description of the device: This device includes an upper test stand 1 and a lower test stand 2 that cooperate with the testing machine. The upper test stand 1 and lower test stand 2 are connected to the testing machine. A detection slot 21 is provided in the middle of the lower test stand 2. It also includes a simulation calibration board 3 made according to the product to be tested. The simulation calibration board 3 is a calibration piece with a similar appearance to the product under test and the test points of the testing machine. The simulation calibration board 3 provides the same test points as the product under test. Several test heads 11 are provided at the bottom of the upper test stand 1, which cooperate with the contacts on the simulation calibration board 3. During testing, the simulation calibration board 3 is placed in the detection slot 21. The simulation calibration board 3 is provided with four sets of detection sections 31. Specifically, the four sets of detection sections 31 are: high-side gate-source-drain current detection position HS-IGSS, high-side drain-source-drain current detection position HS-IDSS, low-side gate-source-drain current detection position LS-IGSS, and low-side drain-source-drain current detection position LS-IDSS (Note: high-side / low-side). The simulation calibration board 3 (i.e., the upper and lower bridges of the half-bridge structure) is also equipped with detection contacts that cooperate with the four sets of detection units 31. At the same time, one end of the simulation calibration board 3 is equipped with a power contact, and the other end is equipped with a detection mode switching contact AC. A precision determining resistor 32 is detachably installed on the detection unit 31. The precision determining resistor 32 is a high-precision, low-temperature drift, high-power non-inductive resistor. With such a known / fixed / stable resistance value, the test results are predictable and highly repeatable, which can accurately and truly evaluate the capability of the test system. That is, the test circuit obtains planned and stable target data through the known / fixed precision determining resistor 32, which is then compared and calibrated with the data of the product under test. Furthermore, the simulation calibration board 3 is also equipped with a thermistor NTC to monitor the temperature of the test environment.

[0012] Preferably, to provide greater flexibility during testing, different precision measuring resistors 32 can be flexibly replaced for testing to increase the comparison ratio and ensure accurate calibration of the measurement results. The two ends of the testing position are provided with insertion slots 33, and the two ends of the precision measuring resistor 32 are provided with insertion posts 321 that cooperate with the insertion slots 33. After the insertion posts 321 are inserted into the insertion slots 33, the circuit connection on the simulation calibration board 3 is completed. Compared with the traditional method of using solder paste to connect the resistor 32 to the circuit, the insertion method in this case is more modular, allowing multiple measurements to be performed using a single simulation calibration board 3, increasing comparison and ensuring measurement effectiveness.

[0013] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A precision calibration device for an electronic product testing and measurement system, characterized in that, The test set includes an upper test stand (1) and a lower test stand (2) that work with the test machine. The lower test stand (2) has a test slot (21) in the middle. The test set also includes a simulation calibration board (3) made according to the product to be tested. The bottom of the upper test stand (1) is provided with several test heads (11) that work with the contacts on the simulation calibration board (3). During testing, the simulation calibration board (3) is placed in the test slot (21). The simulation calibration board (3) is provided with four sets of test sections (31). The test sections (31) are detachably provided with precision determining resistors (32).

2. The accuracy calibration device for an electronic product testing and measurement system according to claim 1, characterized in that: The precision-determining resistor (32) is a high-precision, low-temperature drift, high-power non-inductive resistor.

3. The accuracy calibration device for an electronic product testing and measurement system according to claim 2, characterized in that: The four sets of detection units (31) are respectively the high-side gate-source leakage current detection bit (HS-IGSS), the high-side drain-source leakage current detection bit (HS-IDSS), the low-side gate-source leakage current detection bit (LS-IGSS), and the low-side drain-source leakage current detection bit (LS-IDSS). The simulation calibration board (3) is also provided with detection contacts that cooperate with the four sets of detection units (31).

4. The accuracy calibration device for an electronic product testing and measurement system according to claim 3, characterized in that, The detection position is provided with a plug slot (33) at both ends, and the precision determination resistor (32) is provided with a plug post (321) that cooperates with the plug slot (33) at both ends. After the plug post (321) is inserted into the plug slot (33), the circuit connection on the simulation calibration board (3) is completed.

5. The accuracy calibration device for an electronic product testing and measurement system according to claim 3, characterized in that, The simulation calibration board (3) has a power contact at one end and a detection mode switching contact (AC) at the other end.

6. The accuracy calibration device for an electronic product testing and measurement system according to claim 1, characterized in that, The simulation calibration board (3) is also equipped with a thermistor (NTC) to monitor the temperature of the test environment.

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