Small pressure sensor precision test tool
By designing a small pressure sensor accuracy testing fixture, the problems of time-consuming, labor-intensive, and high false positive rates in traditional testing were solved, enabling automated batch testing of various types of sensors and improving testing efficiency and accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING RUNKE GENERAL TECH
- Filing Date
- 2025-07-07
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional pressure sensor accuracy testing suffers from problems such as being time-consuming and labor-intensive, having a high rate of false readings, poor versatility, and being unable to perform batch testing. Furthermore, human interpretation is prone to errors, affecting work efficiency and delivery schedules.
A small pressure sensor accuracy testing fixture was designed, including a PCB test board and a sealed fixing structure. It supports multiple types of pressure sensor interfaces, can test 30 sensors simultaneously, and achieves automated interpretation through a host computer processor.
It implements a universal interface for various types of pressure sensors, enabling simultaneous testing of 30 sensors, simplifying operation, reducing human error, shortening the testing cycle, and improving testing efficiency and accuracy.
Smart Images
Figure CN224398880U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sensor accuracy testing technology, and more specifically, to a small pressure sensor accuracy testing fixture. Background Technology
[0002] Sensor accuracy needs to be tested before leaving the factory or before use. For example, in land equipment systems, atmospheric pressure and internal pressure are detected, and pressure sensors are generally used for testing. Therefore, there are high accuracy requirements for the pressure sensors in each product, so it is necessary to carry out accuracy testing of pressure sensors. The accuracy of pressure sensors is generally required to be no more than 0.05 kPa. Through accuracy measurement, a reasonable judgment can be made to confirm whether the pressure sensor is qualified.
[0003] Traditional pressure sensor accuracy testing primarily relies on the product carrier to detect pressure sensor accuracy and read data from the carrier to confirm the sensor's accuracy. If device damage occurs, the product must be reworked, which is time-consuming and labor-intensive. Furthermore, pressure sensor accuracy measurement under pressure requires a sealed environment. The product with the pressure sensor is placed inside, and different pressure values are applied, data is read, and manually interpreted. The readings are then compared to a pressure standard to determine the accuracy. Specifically, the test environment involves placing the product with the pressure sensor inside a sealed enclosure. A pressurization device uses a vent hose to pressurize the sealed enclosure. A wireless module reads the pressure sensor readings, and the feedback value is compared to a standard pressure value to calculate the error and determine if the pressure sensor's accuracy is acceptable.
[0004] Because the accuracy testing of pressure sensors is a delayed process compared to the product manufacturing process, the testing environment for pressure sensors is singular, and only one unit is tested at a time, resulting in poor versatility and making batch testing impossible. Furthermore, the sensor installation interface is limited, and real-time manual monitoring and interpretation lead to high false readings and errors, resulting in lengthy testing times that impact work efficiency. Additionally, the repair of faulty components is cumbersome, time-consuming, and labor-intensive, affecting delivery schedules. Utility Model Content
[0005] This application provides a small pressure sensor accuracy testing fixture to solve at least one of the problems in the prior art.
[0006] According to an embodiment of this application, a small pressure sensor accuracy testing fixture is provided, comprising:
[0007] A PCB (Printed Circuit Board) test board, wherein one end of the PCB test board is provided with multiple sensor slots, and the pressure sensor to be tested is inserted into the sensor slots; the other end of the PCB test board is provided with a data interface, and the PCB test board is electrically connected to a host computer processor through the data interface.
[0008] The PCB test board has a sealed and fixed structure. One end of the PCB test board with the sensor slot is fixed and sealed by the sealed and fixed structure. The other end of the PCB test board with the data interface is placed outside the sealed and fixed structure. The sealed and fixed structure has a vent hole. The vent hole is connected to a pressurizing device through a vent hose to apply pressure to the pressure sensor under test inside the sealed and fixed structure.
[0009] In some embodiments of this application, a probe mounting module is further included, which is disposed within the sealed fixing structure and is used to supply power to the pins of the PCB test board.
[0010] In some embodiments of this application, the sealing and fixing structure includes a first sealing and fixing plate and a second sealing and fixing plate; the first sealing and fixing plate is sealed and fixedly connected to a first end face of the PCB test board, and the second sealing and fixing plate is sealed and fixedly connected to a second end face of the PCB test board. Both the first sealing and fixing plate and the second sealing and fixing plate are located at the end of the PCB test board where the sensor slots are located. The first sealing and fixing plate and the second sealing and fixing plate together seal the pressure sensors to be tested in the plurality of sensor slots.
[0011] In some embodiments of this application, the first sealing fixing plate includes a module fixing plate and a back plate; the module fixing plate is provided with a module mounting groove, the module mounting groove extends through opposite end faces of the module fixing plate, and the shape and size of the module mounting groove match the shape and size of the probe mounting module, the probe mounting module is fixedly installed in the module mounting groove; the back plate is fixedly connected to one end face of the module fixing plate, sealing one open end of the module mounting groove; the PCB test board is sealed and fixedly connected to the other end face of the module fixing plate, and in the direction perpendicular to the PCB test board, the projections of all the sensor slots on the module fixing plate are located within the other open end of the module mounting groove.
[0012] In some embodiments of this application, a first sealing groove is provided on the end face of the module fixing plate near the PCB test board, and the first sealing groove is located on the outer periphery of the module mounting groove; a first sealing ring is provided in the first sealing groove, and the first sealing ring seals the module fixing plate and the PCB test board.
[0013] In some embodiments of this application, the vent is disposed on the outer surface of the back plate, the vent communicates with the module mounting slot, and the probe mounting module is provided with at least one communicating hole.
[0014] In some embodiments of this application, a plurality of air gap channels are arranged on the end face of the back plate near the module fixing plate. Each air gap channel is connected to the vent hole, and in the direction perpendicular to the PCB test board, the projection of all the air gap channels on the module fixing plate is located in one open end of the module mounting slot.
[0015] In some embodiments of this application, the module fixing plate, the back plate, and the second sealing fixing plate are all rectangular structures.
[0016] In some embodiments of this application, the module fixing plate has a plurality of first mounting holes on its end face near the PCB test board, and the plurality of first mounting holes are evenly arranged along the four sides of the module fixing plate; the PCB test board has a plurality of second mounting holes on one end where the sensor slot is located, each second mounting hole penetrating the first end face and the second end face of the PCB test board, and the plurality of second mounting holes are respectively arranged in a one-to-one correspondence with the plurality of first mounting holes; the second sealing fixing plate has a plurality of third mounting holes, each third mounting hole penetrating the opposite two end faces of the second sealing fixing plate, and the plurality of third mounting holes are respectively arranged in a one-to-one correspondence with the plurality of first mounting holes; the second sealing fixing plate, the PCB test board and the module fixing plate are fixedly connected by first bolts passing through the third mounting holes, the second mounting holes and the first mounting holes in sequence;
[0017] The module fixing plate has multiple fourth mounting holes on its end face near the back plate, and the multiple fourth mounting holes are evenly arranged along the four sides of the module fixing plate; the back plate has multiple fifth mounting holes, each of which penetrates through the opposite two end faces of the back plate, and the multiple fifth mounting holes are respectively arranged in a one-to-one correspondence with the multiple fourth mounting holes; the back plate and the module fixing plate are fixedly connected by second bolts that are sequentially passed through the fifth mounting holes and the fourth mounting holes.
[0018] In some embodiments of this application, a second sealing groove is provided on the second end face of the PCB test board, and the second sealing groove is located on the outer periphery of all the sensor slots. A second sealing ring is provided in the second sealing groove. A third sealing groove is provided on the end face of the second sealing fixing plate near the PCB test board, and the third sealing groove is corresponding to the second sealing groove. A third sealing ring is provided in the third sealing groove. The PCB test board and the second sealing fixing plate are sealed together by the second sealing ring and the third sealing ring.
[0019] The beneficial effects of the embodiments of this application are as follows:
[0020] The PCB test board of this small pressure sensor accuracy testing fixture has reserved interfaces for various types of 6-pin pressure sensors available on the market, which can realize the universality of the interface, the mass production of supporting products, and can perform accuracy testing on 30 sets of pressure sensors at the same time. It can test a large number of sensors, is simple to operate, and can realize automated pass / fail judgment, avoiding human error, making it more convenient and greatly shortening the product testing cycle. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of a small pressure sensor accuracy testing fixture provided in an embodiment of this application;
[0023] Figure 2 An exploded view of a small pressure sensor accuracy testing fixture provided in an embodiment of this application;
[0024] Figure 3 This application provides a schematic diagram of the structure of a PCB test board in a small pressure sensor accuracy testing fixture.
[0025] Figure 4 This application provides a schematic diagram of the structure of the backplate in a small pressure sensor accuracy testing fixture.
[0026] Figure 5 This application provides a schematic diagram of the structure of a module fixing plate in a small pressure sensor accuracy testing fixture.
[0027] Figure 6A schematic diagram of the probe mounting module in a small pressure sensor accuracy testing fixture provided in this application embodiment;
[0028] Figure 7 This is a schematic diagram of the structure of the second sealing fixing plate in a small pressure sensor accuracy testing fixture provided in an embodiment of this application;
[0029] Explanation of reference numerals in the attached drawings: 1 is the PCB test board, 11 is the sensor slot, 12 is the data interface, 13 is the second end face of PCB test board 1, 14 is the second mounting hole, 15 is the second sealing groove, 2 is the sealing and fixing structure, 21 is the second sealing and fixing plate, 211 is the third mounting hole, 22 is the first sealing and fixing plate, 221 is the module fixing plate, 2211 is the module mounting groove, 2212 is the first sealing groove, 2213 is the first mounting hole, 222 is the back plate, 2221 is the vent hole, 2222 is the air gap channel, 2223 is the fifth mounting hole, 2224 is the connection hole, 3 is the probe mounting module, 31 is the connecting hole, 32 is the probe, 4 is the first sealing ring, 5 is the second sealing ring, 6 is the third sealing ring, 7 is the first bolt, and 8 is the second bolt. Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0031] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, it may include a series of structures, without being limited to the structures listed, but may optionally include structures not listed, or may optionally include other components inherent to these structures.
[0032] This application discloses a small pressure sensor accuracy testing fixture, which is connected to a host computer processor to automate test result interpretation and can simultaneously perform accuracy tests on multiple pressure sensors. Detailed descriptions follow.
[0033] Figure 1 – Figure 7 A small pressure sensor accuracy testing fixture according to an embodiment of this application is shown. Figure 1 – Figure 7As shown, this small pressure sensor accuracy testing fixture mainly includes: a PCB test board 1 and a sealing and fixing structure 2. The PCB test board 1 is mainly used to connect the test circuit board, facilitating the installation and fixing of the pressure sensor. The sealing and fixing structure 2 only fixes and seals the pressure sensor test area on the PCB test board 1. Specifically, the PCB test board 1 is provided with multiple sensor slots 11 and a data interface 12. The pressure sensor to be tested is inserted into the sensor slot 11 to achieve the installation and fixing of the pressure sensor to be tested on the PCB test board 1. The data interface 12 realizes the electrical connection between the PCB test board 1 and the host computer processor. Multiple sensor slots 11 and data interfaces 12 are respectively disposed at both ends of the PCB test board 1. Multiple sensor slots 11 are arranged at one end of the PCB test board 1, and the data interface 12 is disposed at the other end. The end of the PCB test board 1 with the sensor slots 11 is fixed and sealed by a sealing structure 2, while the other end with the data interface 12 is placed outside the sealing structure 2. This means that the multiple sensor slots 11 are disposed in different areas from other components on the PCB test board 1, allowing the sealing structure 2 to seal only the pressure sensor area on the PCB test board 1 with the multiple sensor slots 11, while exposing other components on the PCB test board 1 to the outside of the sealing structure 2. Simultaneously, the sealing structure 2 is provided with a vent 2221, which is connected to a pressurizing device via a ventilation hose to apply pressure to the pressure sensor inside the sealing structure 2.
[0034] In the specific implementation process, the pressure sensor under test can be a cylindrical sensor with a diameter of 5mm and 6 different pins at the bottom. Correspondingly, each sensor slot 11 has 6 pin slots. Furthermore, 30 sensor slots 11 can be arranged at equal intervals on the PCB test board 1, for example, 5 rows and 6 columns. Thus, the PCB test board 1 realizes device power supply and signal acquisition, and one test fixture can simultaneously install 30 pressure sensors under test, thereby simultaneously testing 30 pressure sensors under test. Therefore, this small pressure sensor accuracy test fixture can meet the testing of various types of 6-pin pressure sensors, is easy to operate, can verify up to 30 pressure sensors at the same time, and can automatically give judgment results according to different pressure values. It can detect pressure test operations of different product components and solve the problem of board rework due to components after soldering.
[0035] In the embodiments of this application, such as Figure 2 and Figure 6As shown, the accuracy testing fixture for this small pressure sensor also includes a probe mounting module 3. The probe mounting module 3 is housed within the sealed fixing structure 2 and is used to power the pins of the PCB test board 1. Power is supplied to the device via the probes 32 mounted on the probe mounting module 3 after they are plugged in.
[0036] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the sealing and fixing structure 2 includes a first sealing and fixing plate 22 and a second sealing and fixing plate 21 to seal the two end faces of the PCB test board 1 at the pressure sensor test area, respectively. Specifically, the PCB test board 1 includes a first end face and a second end face 13, and the components on the PCB test board 1 are disposed on the second end face 13. The first sealing and fixing plate 22 is sealed and fixedly connected to the first end face of the PCB test board 1, and the second sealing and fixing plate 21 is sealed and fixedly connected to the second end face 13 of the PCB test board 1. Both the first sealing and fixing plate 22 and the second sealing and fixing plate 21 are located at the end of the PCB test board 1 where the sensor slots 11 are located, so that the first sealing and fixing plate 22 and the second sealing and fixing plate 21 together seal the pressure sensors to be tested in multiple sensor slots 11. In specific implementation, the PCB test board 1 can be fixedly connected to the first sealing and fixing plate 22 and the second sealing and fixing plate 21 by means of integral screw fastening.
[0037] In some specific embodiments, such as Figure 2 – Figure 7 As shown, the first sealing and fixing plate 22 includes a module fixing plate 221 and a back plate 222. The module fixing plate 221 is used to fix the probe mounting module 3, facilitating alignment and fixing with the pressure sensor test area on the PCB test board 1. The back plate 222 is used to fix the entire small pressure sensor accuracy testing fixture and to install and fix other components. Specifically, the module fixing plate 221 is provided with a module mounting groove 2211, which penetrates both opposite end faces of the module fixing plate 221. The shape and size of the module mounting groove 2211 match the shape and size of the probe mounting module 3, thereby fixing the probe mounting module 3 within the module mounting groove 2211. The backplate 222 is fixedly connected to one end face of the module fixing plate 221, and closes one open end of the module mounting slot 2211. The probe 32 on the probe mounting module 3 is located at the other open end of the module mounting slot 2211. The PCB test board 1 is sealed and fixedly connected to the other end face of the module fixing plate 221. In the direction perpendicular to the PCB test board 1, the projections of all sensor slots 11 on the module fixing plate 221 are located inside the other open end of the module mounting slot 2211, thereby ensuring that the probe 32 supplies power to the pins of the pressure sensor test area on the PCB test board 1.
[0038] Furthermore, such as Figure 2 and Figure 5 As shown, a first sealing groove 2212 is provided on the end face of the module fixing plate 221 near the PCB test board 1. The first sealing groove 2212 is located on the outer periphery of the module mounting groove 2211. At the same time, a first sealing ring 4 is provided in the first sealing groove 2212. Thus, when the PCB test board 1 and the module fixing plate 221 are assembled, the first sealing ring 4 completely seals the module fixing plate 221 and the PCB test board 1, ensuring the sealing performance between the structures, preventing air leakage during the test pressurization process, and ensuring the reliability of the test.
[0039] In other embodiments, such as Figure 2 – Figure 7 As shown, a vent 2221 is disposed on the outer surface of the back plate 222. The vent 2221 connects to the module mounting slot 2211, and the probe mounting module 3 is provided with at least one connecting hole 31, so that the sealing cavity of the sealing and fixing structure 2 and the PCB test board 1 are interconnected. This allows for pressure testing of the sealing and fixing structure 2 through a vent hose and a pressurizing device to ensure that the sealing cavity of the sealing and fixing structure 2 reaches the specified air pressure value. Furthermore, multiple air gap channels 2222 are arranged on the end face of the back plate 222 near the module fixing plate 221. Each air gap channel 2222 is connected to the vent 2221, and in the direction perpendicular to the PCB test board 1, the projections of all air gap channels 2222 on the module fixing plate 221 are all located within one open end of the module mounting slot 2211. Within this area, all air gap channels 2222 are evenly distributed, thereby ensuring that pressurized gas can circulate to all parts and achieve a uniform pressurization effect.
[0040] In some specific embodiments, such as Figure 2 – Figure 7As shown, the module fixing plate 221, the back plate 222, and the second sealing fixing plate 21 are all rectangular structures. Furthermore, the module fixing plate 221, the back plate 222, the second sealing fixing plate 21, and the PCB test board 1 are bolted together. In detail, the module fixing plate 221 has multiple first mounting holes 2213 on the end face near the PCB test board 1, and the multiple first mounting holes 2213 are evenly arranged along the four sides of the module fixing plate 221. Correspondingly, the PCB test board 1 has multiple second mounting holes 14 on one end of the sensor slot 11. Each second mounting hole 14 penetrates the first end face and the second end face 13 of the PCB test board 1, and the multiple second mounting holes 14 are respectively set one-to-one with the multiple first mounting holes 2213. At the same time, the second sealing fixing plate 21 has multiple third mounting holes 211. Each third mounting hole 211 penetrates the opposite two end faces of the second sealing fixing plate 21, and the multiple third mounting holes 211 are respectively set one-to-one with the multiple first mounting holes 2213. Thus, the first bolt 7 passes through the third mounting holes 211, the second mounting holes 14 and the first mounting holes 2213 in sequence and fixes them, so that the second sealing fixing plate 21, the PCB test board 1 and the module fixing plate 221 are fixedly connected. In addition, the module fixing plate 221 has multiple fourth mounting holes (not shown in the figure) on its end face near the back plate 222, and these fourth mounting holes are evenly arranged along the four sides of the module fixing plate 221. Correspondingly, the back plate 222 has multiple fifth mounting holes 2223, each of which penetrates through the opposite two end faces of the back plate 222. Each of the fifth mounting holes 2223 corresponds one-to-one with a number of fourth mounting holes. The second bolt 8 is then passed through the fifth mounting holes 2223 and the fourth mounting holes in sequence and fixed in place, thus securing the back plate 222 and the module fixing plate 221. This configuration securely connects the PCB test board 1 and the second sealing fixing plate 21 to one end face of the module fixing plate 221, and the back plate 222 to the other end face of the module fixing plate 221. In the specific implementation process, there are twelve mounting holes: the first mounting hole 2213, the second mounting hole 14, the third mounting hole 211, the fourth mounting hole, and the fifth mounting hole 2223. In the direction perpendicular to the PCB test board 1, the multiple first mounting holes 2213, the multiple second mounting holes 14, the multiple third mounting holes 211, the multiple fourth mounting holes, and the multiple fifth mounting holes 2223 are respectively set one at each of the four corners of the rectangular structure, and two at equal intervals on each of the other sides.
[0041] In other specific embodiments, such as Figure 2 – Figure 7As shown, a second sealing groove 15 is provided on the second end face 13 of the PCB test board 1, and the second sealing groove 15 is located on the outer periphery of all sensor slots 11. At the same time, a second sealing ring 5 is provided in the second sealing groove 15. In addition, a third sealing groove (not shown in the figure) is provided on the end face of the second sealing fixing plate 21 near the PCB test board 1, and the third sealing groove is corresponding to the second sealing groove 15. At the same time, a third sealing ring 6 is provided in the third sealing groove. When the PCB test board 1 and the second sealing fixing plate 21 are assembled, the PCB test board 1 and the second sealing fixing plate 21 are sealed by the second sealing ring 5 and the third sealing ring 6. Thus, the second sealing ring 5 and the third sealing ring 6 completely seal the PCB test board 1 and the second sealing fixing plate 21, ensuring the airtightness between the structures, preventing air leakage during the test pressurization process, and ensuring the reliability of the test.
[0042] The above describes the various components of the small pressure sensor accuracy testing fixture provided in the embodiments of this application and their connection relationships. The following section, in conjunction with... Figure 1 – Figure 7 The working principle of the small pressure sensor accuracy testing fixture is described in detail.
[0043] In this embodiment, the module fixing plate 221 and the back plate 222 are assembled and fixed together. The probe mounting module 3 is placed inside the module fixing plate 221, and the pressure sensor to be tested is placed inside the small pressure sensor accuracy testing fixture. The fixture is then sealed by the second sealing fixing plate 21. The host computer processor supplies power to all components through the PCB test board 1 and receives returned data through the data interface 12. It reads the pressure value of each component, displays and judges the pressure value of the pressure sensor to be tested, inputs a standard value according to the standard table, compares it with the test value to obtain the difference, and then displays the test error. If the error exceeds the judgment standard, the host computer processor's display interface highlights it in red and indicates that the pressure sensor at the corresponding position is unqualified; otherwise, it is qualified and recorded. This achieves automatic pressure testing, reduces test errors, and achieves accurate judgment.
[0044] In summary, this application discloses a small pressure sensor accuracy testing fixture. Its PCB test board has reserved interfaces for various types of 6-pin pressure sensors available on the market, which can realize the universality of the interface, the mass production of supporting products, and can simultaneously perform accuracy testing on 30 sets of pressure sensors. It can test a large number of sensors, is simple to operate, and can realize automated pass / fail judgment, avoiding human error, making it more convenient and greatly shortening the product testing cycle.
[0045] It will be understood by those skilled in the art that the accompanying drawings are merely schematic diagrams of one embodiment, and the components shown in the drawings are not necessarily essential for implementing this invention. It should also be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0047] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope described in the claims.
Claims
1. A fixture for testing the accuracy of a small pressure sensor, characterized in that, include: A PCB test board, wherein a plurality of sensor slots are arranged at one end of the PCB test board, and the pressure sensor to be tested is inserted into the sensor slots; and a data interface is provided at the other end of the PCB test board, through which the PCB test board is electrically connected to a host computer processor. The PCB test board has a sealed and fixed structure. One end of the PCB test board with the sensor slot is fixed and sealed by the sealed and fixed structure. The other end of the PCB test board with the data interface is placed outside the sealed and fixed structure. The sealed and fixed structure has a vent hole. The vent hole is connected to a pressurizing device through a vent hose to apply pressure to the pressure sensor under test inside the sealed and fixed structure.
2. The precision testing fixture for a small pressure sensor according to claim 1, characterized in that, Also includes: A probe mounting module, which is disposed within the sealed fixing structure, is used to supply power to the pins of the PCB test board.
3. The precision testing fixture for a small pressure sensor according to claim 2, characterized in that, The sealing and fixing structure includes a first sealing and fixing plate and a second sealing and fixing plate; the first sealing and fixing plate is sealed and fixedly connected to a first end face of the PCB test board, and the second sealing and fixing plate is sealed and fixedly connected to a second end face of the PCB test board. Both the first sealing and fixing plate and the second sealing and fixing plate are located at the end of the PCB test board where the sensor slots are located. The first sealing and fixing plate and the second sealing and fixing plate together seal the pressure sensors to be tested in the multiple sensor slots.
4. The precision testing fixture for a small pressure sensor according to claim 3, characterized in that, The first sealing and fixing plate includes a module fixing plate and a back plate; the module fixing plate is provided with a module mounting groove, which extends through both opposite end faces of the module fixing plate, and the shape and size of the module mounting groove matches the shape and size of the probe mounting module, and the probe mounting module is fixedly installed in the module mounting groove; the back plate is fixedly connected to one end face of the module fixing plate, sealing one open end of the module mounting groove; the PCB test board is sealed and fixedly connected to the other end face of the module fixing plate, and in the direction perpendicular to the PCB test board, the projections of all the sensor slots on the module fixing plate are located within the other open end of the module mounting groove.
5. The precision testing fixture for a small pressure sensor according to claim 4, characterized in that, A first sealing groove is provided on the end face of the module fixing plate near the PCB test board, and the first sealing groove is located on the outer periphery of the module mounting groove; a first sealing ring is provided in the first sealing groove, and the first sealing ring seals the connection between the module fixing plate and the PCB test board.
6. The precision testing fixture for a small pressure sensor according to claim 4, characterized in that, The vent is located on the outer surface of the back plate, the vent is connected to the module mounting slot, and the probe mounting module is provided with at least one connecting hole.
7. The precision testing fixture for a small pressure sensor according to claim 6, characterized in that, Multiple air gap channels are arranged on the end face of the back plate near the module fixing plate. Each air gap channel is connected to the vent hole. In the direction perpendicular to the PCB test board, the projection of all air gap channels on the module fixing plate is located in one opening end of the module mounting slot.
8. The precision testing fixture for a small pressure sensor according to claim 4, characterized in that, The module fixing plate, the back plate, and the second sealing fixing plate are all rectangular structures.
9. The precision testing fixture for a small pressure sensor according to claim 8, characterized in that, The module fixing plate has multiple first mounting holes on its end face near the PCB test board, and these first mounting holes are evenly arranged along the four sides of the module fixing plate. The PCB test board has multiple second mounting holes at the end where the sensor slot is located, each second mounting hole penetrating both the first and second end faces of the PCB test board, and each second mounting hole corresponds one-to-one with each of the first mounting holes. The second sealing fixing plate has multiple third mounting holes, each third mounting hole penetrating both opposite end faces of the second sealing fixing plate, and each third mounting hole corresponds one-to-one with each of the first mounting holes. The second sealing fixing plate, the PCB test board, and the module fixing plate are fixedly connected by first bolts that sequentially pass through the third mounting holes, the second mounting holes, and the first mounting holes. The module fixing plate has multiple fourth mounting holes on its end face near the back plate, and the multiple fourth mounting holes are evenly arranged along the four sides of the module fixing plate; the back plate has multiple fifth mounting holes, each of which penetrates through the opposite two end faces of the back plate, and the multiple fifth mounting holes are respectively arranged in a one-to-one correspondence with the multiple fourth mounting holes; the back plate and the module fixing plate are fixedly connected by second bolts that are sequentially passed through the fifth mounting holes and the fourth mounting holes.
10. The precision testing fixture for a small pressure sensor according to claim 3, characterized in that, A second sealing groove is provided on the second end face of the PCB test board, and the second sealing groove is located on the outer periphery of all the sensor slots. A second sealing ring is provided in the second sealing groove. A third sealing groove is provided on the end face of the second sealing fixing plate near the PCB test board, and the third sealing groove is corresponding to the second sealing groove. A third sealing ring is provided in the third sealing groove. The PCB test board and the second sealing fixing plate are sealed together by the second sealing ring and the third sealing ring.