Testing tool and testing method for differential pressure sensor core.

Abstract

A tool and a method for testing differential pressure sensor cores 4 are provided. The differential pressure sensor cores are mounted between an upper mounting socket 3 and a lower mounting socket 1 o

Description

[0002] This application relates to the field of pressure testing devices, and in particular, to a testing tool and a testing method for a differential pressure sensor core. '10 BACKGROUND OF THE INVENTION I

[0003] A differential pressure sensor core testing tool is an essential device in a differential I pressure sensor core test. Design quality of the testing tool determines testing accuracy and , efficiency for the differential pressure sensor core. ।

[0004] Currently, most differential pressure sensor core testing tools use a testing 15 configuration with a single core, and each testing tool can test only one sensor core at one time. To test a plurality of differential pressure sensor cores simultaneously, a plurality of identical testing tools needs to be used. As a result, workload for mounting respective differential pressure sensor cores is heavy, and testing efficiency is not high. More unfavorable, due to use of a plurality of single-core testing tools, a lot of intake pipe joints are needed to be connected 20 in series or in parallel, resulting in stress between various joints. Meanwhile, a differential pressure sensor core test may perform under a low temperature as -60°C, and under a high temperature over 200°C. Because there are a lot of intake pipe joints and the stress exists between these joints, gas leakage may occur in the intake pipe joints, which affects testing accuracy of the differential pressure sensor core and may even cause a failure of the entire 25 testing.

[0005] On one hand, in known tools, an existing design for a testing tool is such that one ends of each of a plurality of differential pressure sensor cores are assembled onto a structural component to share one gas inlet, while the other ends of these differential pressure sensor cores are connected to respective connection structures in one-to-one relationship so that a plurality of gas inlets are adopted. Although this testing tool may partially improve the testing efficiency, 5 there is still a problem of gas leakage in gas inlets because there still exists a large number of intake pipe joints in the testing tool.

[0006] The foregoing solution cannot completely resolve problems of heavy workload involved in mounting a differential pressure sensor core testing tool, low testing efficiency, and air leakage at intake pipe joints, which affects the testing accuracy and even causes a failure of 10 the testing.

[0007] On the other hand, current testing methods for differential pressure sensor core are not standardized, resulting in poor testing quality and low testing efficiency. Existence of these problems may inevitably affect product quality and production efficiency of differential । pressure sensor cores. 15

[0008] In view of the above, it would be of great significance to develop a differential ► pressure sensor core testing tool with high testing efficiency that is easy to assemble, simple to , operate, and convenient for use, as well as an optimized differential pressure sensor core testing । method. SUMMARY OF THE INVENTION 20

[0009] Embodiments of this application provide a testing tool and a testing method for a differential pressure sensor core, to resolve problems of heavy workload involved in mounting a core and low testing efficiency for an existing testing tool with a single core structure, or a testing tool of which one end is assembled on a structural component to share one gas inlet while the other end uses an one-to-one connection structure; and to resolve a problem that a 25 plurality of intake pipe joints may easily result in air leakage, which affects testing accuracy and even cause testing work to fail.

[0010] According to a first aspect, a testing tool for differential pressure sensor core is provided in accordance with claim 1..

[0011] In some embodiments of this application, the tool further includes two screws, wherein

[0012] the upper mounting socket is further provided with two screw through holes for the screws to pass through, and the screw through holes are located between the guide-shaft through holes along the short side plate of the upper mounting socket;

[0013] two screw nuts with an internal thread structure matching with an external thread of 5 the screw are correspondingly provided to cover the respective screw through hole on the upper mounting socket; the screw nuts cover the screw through holes and are fixed on the upper mounting socket;

[0014] the lower mounting socket is provided with an upper tapered roller bearing mount and a lower tapered roller bearing mount; and each of the upper tapered roller bearing mount and the 10 lower tapered roller bearing mount is of a cylindrical bored-configuration;

[0015] an upper tapered roller bearing is mounted in the upper tapered roller bearing mount, and a lower tapered roller bearing is mounted in the lower tapered roller bearing mount; and

[0016] each screw is screwed into respective screw nut via thread, sequentially passes through ' 1 i I, . , , , , „ , .--ill,. । the upper tapered roller bearing and the lower tapered roller bearing, and is tightly locked 15 together with the lower tapered roller bearing at a bottom end of the screw by using a fixing nut. ►

[0017] In some embodiments of this application, the two screws are further provided with , keyways; each of the two screws is sleeved with a sprocket; the sprocket is provided with a । keyway structure that matches the keyway on the screw; a square key is disposed in a space enclosed by the key way on the sprocket and the keyway on the screw; and the sprocket is 20 connected to the screw by using the square key; and

[0018] a chain is sleeved between the two sprockets, and the chain meshes with the sprocket.

[0019] In some embodiments of this application, one of the two screws is further provided with a handwheel; and

[0020] a center of the handwheel is of a circular ring structure; a keyway structure that 25 matches the keyway on the screw is disposed in a circular ring; a square key is disposed in a space enclosed by a keyway on the handwheel and the keyway on the screw; and the handwheel is connected to the screw by using the square key. A tester may move the upper mounting socket upward and downward by rotating the handwheel, to make the upper mounting socket engaged with or separated from the lower mounting socket. In this embodiment, the handwheel may be 30 mounted in any one of the two screws.

[0021] In some embodiments of this application, an internal thread is disposed in the lower positioning pin base;

[0022] the upper positioning pin base and the lower positioning pin base are positioned by using positioning pins; 5

[0023] one end of the positioning pin is provided with an external thread that matches the internal thread of the lower positioning pin base; and

[0024] the positioning pin is connected to the lower positioning pin base through the thread.

[0025] According to a second aspect, a testing method for differential pressure sensor core using the testing tool for differential pressure sensor core according to any item of the first 10 aspect, wherein the method includes:

[0026] obtaining all differential pressure sensor cores to-be-tested, where for each differential pressure sensor core to-be-tested, one end thereof is a positive chamber, and the other end is a negative chamber; j

[0027] for all differential pressure sensor cores to-be-tested, mounting the chambers of one 15 pressure characteristic into a lower mounting socket, and mounting the chambers of the other ► pressure characteristic into an upper mounting socket;

[0028] fastening the upper mounting socket and the lower mounting socket to ensure that all । the differential pressure sensor cores to-be-tested are in a clamped state;

[0029] adjusting a position of the testing tool, so that the upper mounting socket and the lower 20 mounting socket are both horizontally oriented; and

[0030] injecting a test gas with a set pressure into a gas inlet, to perform tests on the differential pressure sensor cores to-be-tested.

[0031] In some embodiments, the step of testing the differential pressure sensor core to-be-tested further includes: 25

[0032] performing a mechanical fatigue screening test, a temperature shock aging screening test, an electrical shock aging screening test, an overload test, a bidirectional static pressure error test, a static performance test, a temperature compensation test, a temperature compensation verification test, and a stability test.

[0033] In some embodiments, a method for the mechanical fatigue screening test includes: 30

[0034] mounting the differential pressure sensor core to-be-tested at room temperature; connecting two gas inlets to a fatigue generator, wherein one of the gas inlets communicates with the positive chambers of the differential pressure sensor cores to-be-tested, and the other gas inlet communicates with the negative chambers of the differential pressure sensor cores to-be-tested; adjusting an output of the fatigue generator to a full scale pressure of the 5 differential pressure sensor cores to-be-tested; setting time intervals for pressure application and pressure relief to be 2 seconds; and performing pressure application and pressure relief alternatively for 5000 times for the two gas inlets.

[0035] In some embodiments, a method for the temperature shock aging screening test includes: 10

[0036] placing the testing tool assembled with the differential pressure sensor core to-be-tested into a high-low temperature test chamber; controlling temperature of the high-low temperature test chamber; and after the temperature is stabilized at each temperature point, controlling a high-precision digital multimeter to measure an output signal of the differential । pressure sensor core to-be-tested, controlling an insulation resistance tester to measure an 15 insulation resistance of the differential pressure sensor core to-be-tested, and controlling a ► leakage current tester to measure a leakage current of the differential pressure sensor core , to-be-tested, where a temperature rise and fall rate is remained at 5°C / min, and a testing । temperature point and temperature stabilization duration are set according to the following processes: 20

[0037] maintaining at 25°C for 2 hours; maintaining at -55°C for 2 hours; and maintaining at +150°C for 2 hours; repeating this temperature cycling for four times;

[0038] maintaining at 25°C for 1.5 hours; maintaining at -55°C for 2 hours; and maintaining at +150°C for 2 hours; repeating this temperature cycling for five times; and

[0039] maintaining at 25°C for 1.5 hours; maintaining at -55°C for 12 hours; maintaining at 25 25°C for 2 hours; maintaining at 150°C for 12 hours; and maintaining at 25°C for 12 hours; repeating this temperature cycling twice.

[0040] In some embodiments, a method for the electrical shock aging screening test includes:

[0041] placing the testing tool assembled with the differential pressure sensor core to-be-tested into a high-low temperature test chamber; subsequently, controlling the high-low 30 temperature test chamber, so that temperature thereof is stabilized at 60°C; and controlling output voltage of an adjustable direct current power according to the following processes:

[0042] SI: controlling the output voltage of the adjustable direct current power, so that the adjustable direct current power keeps outputting upper power voltage of the differential pressure sensor core to-be-tested for 2 hours; 5

[0043] S2: controlling the output voltage of the adjustable direct current power, so that the adjustable direct current power keeps outputting rated power voltage of the differential pressure sensor core to-be-tested for 4 hours;

[0044] S3: controlling the output voltage of the adjustable direct current power, so that the adjustable direct current power keeps outputting lower power voltage of the differential pressure 10 sensor core to-be-tested for 2 hours;

[0045] S4: repeating the processes of SI to S3 for 3 times, and powering off for 1 hour;

[0046] S5: repeating the process of S4 for 5 times; and

[0047] S6: controlling a high-precision digital multimeter to measure an output signal of the j differential pressure sensor core to-be-tested, controlling an insulation resistance tester to 15 measure an insulation resistance of the differential pressure sensor core to-be-tested, and 1 controlling a leakage current tester to measure a leakage current of the differential pressure , sensor core to-be-tested. ।

[0048] In some embodiments, a method for the static performance test includes: a static performance test without static pressure for positive chamber, a static performance test with 20 static pressure for positive chamber, a static performance test without static pressure for negative chamber, and a static performance test with static pressure for negative chamber. Content of the performance test includes nonlinearity, temperature hysteresis, repeatability, and comprehensive precision of the differential pressure sensor core to-be-tested.

[0049] A process of the static performance test without static pressure for positive chamber 25 includes:

[0050] connecting the gas inlet that communicates with the positive chamber of the differential pressure sensor core to-be-tested to a gas pressure controller, and enabling the gas inlet that communicates with the negative chamber of the differential pressure sensor core to-be-tested to communicate with the atmosphere; adjusting an output of the gas pressure 30 controller to apply 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of a full scale pressure to the positive chamber of the differential pressure sensor core to-be-tested; controlling a high-precision digital multimeter to measure an output value of the differential pressure sensor core to-be-tested and recording the output value; repeating the foregoing testing process with pressure applied twice for a total of three times; recording the output value of the 5 differential pressure sensor core to-be-tested; and calculating static performance indicators of the nonlinear, the temperature hysteresis, the repeatability, and the comprehensive precision of the positive chamber without static pressure of the differential pressure sensor core to-be-tested.

[0051] A process of the static performance test with static pressure for positive chamber includes: 10

[0052] connecting the gas inlet of the upper mounting socket and the gas inlet of the lower mounting socket to a same gas pressure controller; adjusting an output of the gas pressure controller to pressure required by a static-pressure indicator of the differential pressure sensor core to-be-tested; applying static pressure to the two gas inlets simultaneously; after the static ' • I. , ,, , • . . . i । pressure is reached, turning oft a valve or the gas inlet that communicates with the negative 15 chamber of the differential pressure sensor core to-be-tested; continuing to apply pressure to the 1 gas inlet that communicates with the positive chamber of the differential pressure sensor core , to-be-tested; based on the static pressure, applying additional 0%, 20%, 40%, 60%, 80%, 100%, । 80%, 60%, 40%, 20%, and 0% of full-scale differential pressure to the positive chamber of the differential pressure sensor core to-be-tested; controlling a high-precision digital multimeter to 20 measure an output value of the differential pressure sensor core to-be-tested and recording the output value; repeating the foregoing testing process with pressure applied twice for a total of three times; recording the output value of the differential pressure sensor core to-be-tested; and calculating static performance indicators of the nonlinear, the temperature hysteresis, the repeatability, and the comprehensive precision of the positive chamber with static pressure of 25 the differential pressure sensor core to-be-tested.

[0053] A process of the static performance test without static pressure for negative chamber includes:

[0054] connecting the gas inlet that communicates with the negative chamber of the differential pressure sensor core to-be-tested to a gas pressure controller, and enabling the gas 30 inlet that communicates with the positive chamber of the differential pressure sensor core to-be-tested to communicate with the atmosphere; adjusting an output of the gas pressure controller to apply 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of a full scale pressure to the negative chamber of the differential pressure sensor core to-be-tested; controlling a high-precision digital multimeter to measure an output value of the differential 5 pressure sensor core to-be-tested and recording the output value; repeating the foregoing testing process with pressure applied twice for a total of three times; recording the output value of the differential pressure sensor core to-be-tested; and calculating static performance indicators of the nonlinear, the temperature hysteresis, the repeatability, and the comprehensive precision of the negative chamber without static pressure of the differential pressure sensor core to-be-tested. 10

[0055] A process of the static performance test with static pressure for negative chamber includes:

[0056] connecting the gas inlet of the upper mounting socket and the gas inlet of the lower mounting socket to a same gas pressure controller; adjusting an output of the gas pressure j controller to pressure required by a static-pressure indicator of the differential pressure sensor 15 core to-be-tested; applying static pressure to the two gas inlets simultaneously; after the static 1 pressure is reached, turning off a valve of the gas inlet that communicates with the positive , chamber of the differential pressure sensor core to-be-tested; continuing to apply pressure to the । gas inlet that communicates with the negative chamber of the differential pressure sensor core to-be-tested; based on the static pressure, applying additional 0%, 20%, 40%, 60%, 80%, 100%, 20 80%, 60%, 40%, 20%, and 0% of full-scale differential pressure to the negative chamber of the differential pressure sensor core to-be-tested; controlling a high-precision digital multimeter to measure an output value of the differential pressure sensor core to-be-tested and recording the output value; repeating the foregoing testing process with pressure applied twice for a total of three times; recording the output value of the differential pressure sensor core to-be-tested; and 25 calculating static performance indicators of the nonlinear, the temperature hysteresis, the repeatability, and the comprehensive precision of the negative chamber with static pressure of the differential pressure sensor core to-be-tested.

[0057] In some embodiments, a method for the temperature compensation test includes:

[0058] placing the testing tool assembled with the differential pressure sensor core 30 to-be-tested into a high-low temperature test chamber; connecting the gas inlet that communicates with the positive chamber of the differential pressure sensor core to-be-tested to a gas pressure controller, and enabling the gas inlet that communicates with the negative chamber of the differential pressure sensor core to-be-tested to communicate with the atmosphere; controlling the high-low temperature test chamber, so that temperature thereof is 5 stabilized at -55°C, 25°C, and 150°C, respectively; after the temperature is maintained at each temperature point for 2 hours, controlling the gas pressure controller to output 0 MPa; testing and recording a zero-load output value of the differential pressure sensor core to-be-tested and resistance values of four resistors; controlling the gas pressure controller to output a full scale pressure; testing and recording an output of the differential pressure sensor core to-be-tested and 10 the resistance values of the four resistors at full scale after stabilization; and unloading the pressure after the test ends; and

[0059] based on the outputs of the differential pressure sensor core to-be-tested at the three temperature points that are recorded in the foregoing tests and the resistance values of the four । resistors, calculating a compensation resistance value according to a temperature compensation 15 formula. ►

[0060] It may be learned from the foregoing technical solutions that, beneficial effects of this , application are as follows. ।

[0061] 1) According to the testing tool and the testing method for differential pressure sensor core that are provided in this application, the differential pressure sensor core to-be-tested is 20 mounted between the upper mounting socket and the lower mounting socket of the tool, and the upper mounting socket and the lower mounting socket are fastened, so that the differential pressure sensor core to-be-tested is ensured to be in a clamped state. Subsequently, the test gas is injected through the gas inlet disposed outside the differential pressure sensor core testing tool, to perform a test on the differential pressure sensor core to-be-tested and obtain a test result. 25 According to this application, the upper mounting socket and the lower mounting socket are used for clamping the differential pressure sensor core to-be-tested, and the venting holes and the gas-guide holes that communicate with each other are disposed in the upper mounting socket and the lower mounting socket. Each of the upper mounting socket and the lower mounting socket has only one gas inlet, so that the operator may perform tests on a plurality of 30 differential pressure sensor cores to-be-tested at the same time after the test gas is injected into the gas inlet. In this way, problems that heavy workload involved in mounting differential pressure sensor cores and air leakage caused due to a plurality of intake pipe joints are resolved, thereby improving testing precision and efficiency for the differential pressure sensor core.

[0062] 2) Guide shafts are used together with positioning pins to realize a guidance and 5 positioning for the upper mounting socket and the lower mounting socket during engagement and separation thereof, which can greatly improve alignment precision between the upper mounting socket and the lower mounting socket, thereby ensuring accurate engagement and separation of the upper mounting socket and the lower mounting socket. In this way, it is ensured that the differential pressure sensor cores to-be-tested can be accurately and smoothly 10 pressed into the upper differential pressure sensor core testing seats and the lower differential pressure sensor core testing seats.

[0063] 3) A configuration in which the guide shaft is inserted into the linear bearing is used to convert linear motion into rolling motion, which greatly reduces friction force when the guide । shaft moves relative to the upper mounting socket, making motion of the upper mounting socket 15 more labor-saving and smoother. 1

[0064] 4) A configuration in which the sprocket is driven by the chain to further drive the , screw is used. In this way, it may be ensured that the two screws rotate synchronously, so that । the upper mounting socket is raised or lowered smoothly and horizontally, thereby ensuring that the differential pressure sensor core to-be-tested is pressed into the upper mounting socket and 20 the lower mounting socket of the testing tool synchronously.

[0065] 5) Tapered roller bearings are used, which may ensure smooth rotation of the screw, making motion of the upper mounting socket of the tool more labor-saving and smoother.

[0066] 6) The handwheel is used for driving, making mounting and disassembly of the differential pressure sensor core to-be-tested more convenient and labor-saving. 25

[0067] 7) Mechanical fatigue screening tests, temperature shock aging screening tests, and electrical shock aging screening tests are performed, which may effectively release stress generated during a process of producing the differential pressure sensor core, thereby improving various performance of the differential pressure sensor core.

[0068] 8) Mechanical fatigue screening tests and temperature shock aging screening tests are 30 performed, so that a differential pressure sensor core with a damaged membrane and oil leakage may be effectively found and picked out at an early stage during testing of the differential pressure sensor core. Electrical shock aging screening tests are performed, so that a differential pressure sensor core with unqualified electrical parameters may be effectively found at an early stage during testing of the differential pressure sensor core. In this way, testing efficiency for the 5 differential pressure sensor core may be improved, product quality of the differential pressure sensor core maybe improved, and production costs may be reduced.

[0069] 9) Temperature compensation tests are used to perform temperature compensation for the differential pressure sensor core, which may greatly improve measurement precision for the differential pressure sensor core. 10 BRIEF DESCRIPTION OF THE DRAWINGS

[0070] To more clearly describe the technical solutions of this application, the accompanying drawings to be used in the embodiments will be briefly illustrated below. Obviously, persons of j ordinary skills in the art can also derive other accompanying drawings according to these accompanying drawings without an inventive effort. >15

[0071] FIG. 1 is a three-dimensional view of a differential pressure sensor core testing tool , according to an embodiment of this application; ।

[0072] FIG. 2 is a cross-sectional view of a differential pressure sensor core testing tool according to an embodiment of this application;

[0073] FIG. 3 is a side view of a differential pressure sensor core testing tool according to an 20 embodiment of this application;

[0074] FIG. 4 is a top view of a differential pressure sensor core testing tool according to an embodiment of this application;

[0075] FIG. 5 is a schematic diagram of a structure of a lower mounting socket according to an embodiment of this application; 25

[0076] FIG. 6 is a schematic diagram of a structure of an upper mounting socket according to an embodiment of this application; and

[0077] FIG. 7 is an exploded schematic diagram of a structure of a screw according to an embodiment of this application.

[0078] In the figures: 1. Upper mounting socket; 2. Guide shaft; 3. Lower mounting socket; 4. differential pressure sensor core to-be-tested; 5. First sealing ring; 6. Second sealing ring; 7. Gas inlet; 8. Linear bearing; 9. Screw; 10. Handwheel; 11. Chain; 12. Upper tapered roller bearing; 13. Lower tapered roller bearing; 14. Upper tapered roller bearing mount; 15. Lower tapered roller bearing mount; 16. Screw nut; 17. Fixing nut; 18. Sprocket; 21. Guide-shaft fixing base; 5 23. Lower differential pressure sensor core testing seat; 24. Lower positioning pin base; 26. Guide-shaft through hole; 27. Screw through hole; 28. Upper differential pressure sensor core testing seat; 29. Upper positioning pin base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0079] This application is described below in detail with reference to accompanying drawings 10 in conjunction with various embodiments. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other if they are not in conflict with each other. The technical solutions in the embodiments of this application are । clearly described below in combination with the accompanying drawings in the embodiments of this application. Obviously, the embodiments described herein are merely illustrative and are >15 not exhaustive. According to the embodiments of this application, other embodiments derived , by persons of ordinary skills in the art without creative efforts all fall within the protection । scope of this application.

[0080] It should be noted that brief descriptions of the terms in this application are merely for ease of understanding the implementations described below, and are not intended to limit the 20 implementations of this application. Unless otherwise stated, these terms should have common and ordinary meanings as understood by one of ordinary skills in the art.

[0081] Currently, most differential pressure sensor core testing tools use a testing configuration with a single core, and each testing tool can test only one sensor core at one time. To test a plurality of differential pressure sensor cores simultaneously, a plurality of identical 25 testing tools needs to be used. As a result, workload for mounting respective differential pressure sensor cores is heavy, and testing efficiency is not high.

[0082] For a testing tool in which one ends of each of a plurality of differential pressure sensor cores are assembled onto a structural component to share one gas inlet, while the other ends of these differential pressure sensor cores are connected to respective connection structures in one-to-one relationship so that a plurality of gas inlets are adopted, though the testing efficiency may be partially improved, there is still a problem of gas leakage in gas inlets because there still exists a large number of intake pipe joints in the testing tool.

[0083] The foregoing solution cannot completely resolve problems of heavy workload 5 involved in mounting a differential pressure sensor core testing tool, low testing efficiency, and air leakage at intake pipe joints, which affects the testing accuracy and even causes a failure of the testing.

[0084] On the other hand, current testing methods for differential pressure sensor core are not standardized, resulting in poor testing quality and low testing efficiency. Existence of these 10 problems may inevitably affect product quality and production efficiency of differential pressure sensor cores.

[0085] To resolve the foregoing problems, according to a first aspect, a differential pressure sensor core testing tool is provided in this application. The tool includes a lower mounting j socket 3 and an upper mounting socket 1 that may be coupled with each other, and several guide 15 shafts 2. The upper mounting socket 1 and the lower mounting socket 3 are configured to clamp ► a plurality of differential pressure sensor cores to-be-tested 4. Both a positive chamber and a , negative chamber of a differential pressure sensor core to-be-tested 4 can be in good । communication with test gas, yielding a good testing effect.

[0086] The differential pressure sensor core to-be-tested 4 is a device configured to measure a 20 difference between two pressures, where one end thereof is a positive chamber, and the other end is a negative chamber. There are four resistors within the differential pressure sensor core to-be-tested 4. Signals of the four resistors are led out via signal output lines. The differential pressure sensor core to-be-tested 4 has five signal output lines.

[0087] As shown in FIG. 1 and FIG. 3, when the upper mounting socket 1 is coupled with the 25 lower mounting socket 3, several apertures will be formed on two opposite sides to reduce weight of the testing tool.

[0088] In some embodiments, the lower mounting socket 3 and the upper mounting socket 1 are both provided with gas inlets 7 in a direction parallel to the apertures.

[0089] One of the gas inlets 7 penetrates through one long side plate of the lower mounting 30 socket 3, and terminates at another long side plate of the lower mounting socket 3.

[0090] The other gas inlet 7 penetrates through one long side plate of the upper mounting socket 1, and terminates at another long side plate of the upper mounting socket 1.

[0091] The two gas inlets 7 are connected to valves, respectively. One end of the valve is connected to the gas inlet 7. The gas inlet 7 is configured to inject a test gas with a set pressure 5 into the testing tool. The other end of the valve is connected to a gas outlet of a gas pressure controller through a pipeline.

[0092] The guide shaft 2 may be a circular cylinder with a smooth surface, providing guidance and positioning for the upper mounting socket 1 and the lower mounting socket 3 during engagement / coupling. During a process of mounting the guide shaft 2, the guide shaft 2 10 perpendicularly passes through the upper mounting socket 1 and is mounted into the lower mounting socket 3.

[0093] In some embodiments of this application, guide-shaft fixing bases 21 for mounting the guide shafts 2 are provided on a bottom portion of the lower mounting socket 3. The guide-shaft । fixing base 21 is of a cylindrical recess structure. After the guide shaft 2 is inserted into the 15 guide-shaft fixing base 21, to prevent the guide shaft 2 from loosening and a mis-alignment of 1 the upper mounting socket 1 and the lower mounting socket 3, in the embodiments, the guide , shaft 2 may be fixed within the guide-shaft fixing base 21 by using a fixing component, or may । alternatively be fixed within the guide-shaft fixing base 21 via interference fit.

[0094] Corresponding to a guide-shaft fixing base 21 of the lower mounting socket 3, a 20 guide-shaft through hole 26 for the guide shaft 2 to pass through is provided in a base portion of the upper mounting socket 1. A position of the guide-shaft through hole 26 is corresponded to that of the guide-shaft fixing base 21.

[0095] In some embodiments, as shown in FIG. 5, each of the lower mounting socket 3 and the upper mounting socket 1 includes two long side plates and two short side plates. Several 25 lower differential pressure sensor core testing seats 23 are provided at four corners of the lower mounting socket 3 and along the long side plates of the lower mounting socket 3. A quantity of the lower differential pressure sensor core testing seats 23 is the same as that of the differential pressure sensor cores to-be-tested 4, for mounting the differential pressure sensor cores to-be-tested 4. 30

[0096] As shown in FIG. 6, corresponding to the lower differential pressure sensor core testing seats 23, the upper mounting socket 1 is also provided with several upper differential pressure sensor core testing seats 28. A position of the upper differential pressure sensor core testing seat 28 is corresponded to that of the lower differential pressure sensor core testing seat 23. A quantity of the upper differential pressure sensor core testing seats 28 is the same as that 5 of the differential pressure sensor cores to-be-tested 4. When mounting the differential pressure sensor cores to-be-tested 4, an operator may mount same ends of all differential pressure sensor cores to-be-tested 4, such as the positive chambers of all differential pressure sensor cores to-be-tested 4, into the lower differential pressure sensor core testing seats 23. When coupling the upper mounting socket 1 and the lower mounting socket 3, the upper differential pressure 10 sensor core testing seats 28 on the upper mounting socket 1 may be engaged onto the other ends of all differential pressure sensor cores to-be-tested 4, such as the negative chambers of all differential pressure sensor cores to-be-tested 4. In this case, all the differential pressure sensor cores to-be-tested 4 are in a clamped state. j

[0097] In the foregoing embodiments, there are two mounting strategies. A first one is that the 15 positive chambers of all differential pressure sensor cores to-be-tested 4 are mounted in the 1 lower mounting socket 3. To be specific, the positive chambers of all differential pressure sensor , cores to-be-tested 4 are assembled in the lower differential pressure sensor core testing seats 23, । and the negative chambers of all differential pressure sensor cores to-be-tested 4 are assembled in the upper differential pressure sensor core testing seats 28. A second one is that the positive 20 chambers of all differential pressure sensor cores to-be-tested 4 are mounted in the upper mounting socket 1. To be specific, the positive chambers of all differential pressure sensor cores to-be-tested 4 are assembled in the upper differential pressure sensor core testing seats 28, and the negative chambers of all differential pressure sensor cores to-be-tested 4 are assembled in the lower differential pressure sensor core testing seats 23. 25

[0098] It should be noted that in the embodiments, it only requires that the same ends of all differential pressure sensor cores to-be-tested 4 are mounted / placed in the same mounting socket. For example, the positive chambers of all differential pressure sensor cores to-be-tested 4 are mounted in the lower mounting socket 3, and the negative chambers of all differential pressure sensor cores to-be-tested 4 are mounted in the upper mounting socket 1. 30

[0099] In some embodiments of this application, as shown in FIG. 2, a linear bearing 8 is provided in the guide-shaft through hole 26. The guide shaft 2 passes through the linear bearing 8 to ensure a stable and smooth relative motion between the guide shaft 2 and the upper mounting socket 1. The linear bearing 8 is a device for linear movement, and is used in conjunction with a cylindrical shaft for linear travel. During mounting of the linear bearing 8, 5 the linear bearing 8 may extend across the guide-shaft through hole 26. The linear bearing 8 is fixed on the upper mounting socket 1 via a hexagon socket-head cap bolt. A configuration in which the guide shaft 2 is fitted in the linear bearing 8 is used to convert linear motion into rolling motion, which reduces friction force when the guide shaft 2 moves relative to the upper mounting socket 1, making a process of mounting the differential pressure sensor core 10 to-be-tested 4 more labor-saving.

[00100] In some embodiments, as shown in FIG. 3, a first sealing ring 5 is further disposed at a lower end of the differential pressure sensor core to-be-tested 4, and a second sealing ring 6 is further disposed at an upper end of the differential pressure sensor core to-be-tested 4, to । produce a buffering effect on the differential pressure sensor core to-be-tested 4 during fastening. 15 According to another aspect, a provision of the first sealing ring 5 and the second sealing ring 6 ► also yield a sealing effect during a test of the differential pressure sensor core to-be-tested 4. ,

[00101] Referring to FIG. 5 and FIG. 6, two lower positioning pin bases 24 are respectively । disposed on a short side plate of the lower mounting socket 3. Along the short side plate, the guide-shaft fixing bases 21 are connected to each other via a plate-like structure. Two upper 20 positioning pin bases 29 are respectively disposed on a short side plate of the upper mounting socket 1. A position of the upper positioning pin base 29 is corresponded to that of the lower positioning pin base 24.

[00102] In some embodiments of this application, an internal thread is provided in the lower positioning pin base 24. A lower end of the positioning pin is provided with an external thread 25 that matches with the internal thread of the lower positioning pin base 24. The lower end of the positioning pin is connected to the lower positioning pin base 24 through the thread.

[00103] After the upper mounting socket 1 is engaged with the lower mounting socket 3, an upper end of the positioning pin enters into the upper positioning pin base 29 to further improve alignment precision between the upper mounting socket 1 and the lower mounting socket 3, 30 thereby ensuring that all differential pressure sensor cores to-be-tested 4 can be accurately pressed within the testing tool.

[00104] As shown in FIG. 7, in some embodiments of this application, the testing tool further includes two screws 9. The screw 9 is of a cylindrical structure, where a top end and a bottom end thereof are slightly smaller, while a middle portion is relatively larger. Keyways are 5 disposed at the top end of the screw, and an external screw thread structure is provided at the bottom end.

[00105] In some embodiments, as shown in FIGs. 1-3, the upper mounting socket 1 is further provided with two screw through holes 27 for the screws 9 to pass through. The screw through hole 27 is located between two guide-shaft through holes 26 along the short side plate of the 10 upper mounting socket 1. A screw nut 16 with an internal thread structure matching with an external thread of the screw 9 is provided on the upper mounting socket 1 at a position to cover the screw through hole 27. The screw nut 16 covers the screw through hole 27, and is fixed on the upper mounting socket 1. j

[00106] In some embodiments of this application, the lower mounting socket 3 is further 15 provided with an upper tapered roller bearing mount 14 and a lower tapered roller bearing 1 mount 15. Each of the upper tapered roller bearing mount 14 and the lower tapered roller , bearing mount 15 has a cylindrical bored-configuration. ।

[00107] An upper tapered roller bearing 12 is mounted in the upper tapered roller bearing mount 14, and a lower tapered roller bearing 13 is mounted in the lower tapered roller bearing 20 mount 15. The upper tapered roller bearing 12 is subjected to a force directing downwardly, and the lower tapered roller bearing 13 is subjected to a force directing upwardly.

[00108] Inner and outer rings of the upper tapered roller bearing 12 and the lower tapered roller bearing 13 all have conical tracks.

[00109] The screw 9 is screwed into the screw nut 16 via its thread, sequentially passes 25 through the upper tapered roller bearing 12 and the lower tapered roller bearing 13, and is tightly locked together with the lower tapered roller bearing 13 at a bottom end of the screw 9 via a fixing nut 17.

[00110] In some embodiments of this application, the two screws 9 are further provided with keyways. Each of the two screws 9 is sleeved with a sprocket 18. The sprocket 18 is provided 30 with a keyway structure that matches with the keyway on the screw 9. Square keys are disposed in spaces enclosed by the key ways on the sprocket 18 and the keyways on the screw 9. The sprocket 18 is connected to the screw 9 via the square keys. The screw 9 and the sprocket 18 may rotate synchronously. Two sprockets 18 are mounted at the same height on the two screws 9, and a chain 11 is disposed between the two sprockets 18. The chain 11 wraps around the two 5 sprockets 18 to form a structure similar to a conveyor belt. The chain 11 meshes with the sprockets 18. When the chain 11 turns around, the sprockets 18 may also drive the screw 9 to rotate synchronously. According to the embodiments, the screw 9 is driven when the chain 11 drives the sprockets 18, so that the upper mounting socket 1 may be raised or lowered smoothly, thereby ensuring that all differential pressure sensor cores to-be-tested 4 are pressed into the 10 testing tool synchronously.

[00111] In some embodiments of this application, referring to FIG. 4, one of the two screws 9 is further provided with a handwheel 10. A circular ring structure is provided at the center of the handwheel 10. A keyway structure that matches with the keyways on the screw 9 is provided on j the circular ring. Square keys are disposed in spaces enclosed by key ways on the handwheel 10 15 and the keyways on the screw 9. The handwheel 10 is connected to the screw 9 via the square 1 keys. An operator may move the upper mounting socket 1 upward and downward by turning the , handwheel 10, to make the upper mounting socket 1 couple with or separate from the lower । mounting socket 3. In the embodiments, the handwheel 10 may be mounted onto any one of the two screws 9. 20

[00112] In some embodiments of this application, a lower venting hole is provided in a lower differential pressure sensor core testing seat 23, and an upper venting hole is provided in an upper differential pressure sensor core testing seat 28. The short side plate of the upper mounting socket 1 is further provided with upper gas-guide holes, and the short side plate of the lower mounting socket 3 are further provided with a lower gas-guide holes. 25

[00113] Further, the upper mounting socket 1 and the lower mounting socket 3 of the testing tool are respectively provided with one gas inlet 7. Therefore, regarding the two gas inlets 7 described above, one of the gas inlets 7 forms an airtight communication chamber with the upper venting holes and the upper gas-guide holes; and the other gas inlet 7 forms an airtight communication chamber with the lower venting holes and the lower gas-guide holes. In this way, 30 it is ensured that the test gas is injected from the gas inlet 7, and reaches the differential pressure sensor core to-be-tested 4 for testing after passing through the upper gas-guide hole and the upper venting hole, or the lower gas-guide hole and the lower venting hole. It is ensured that the upper mounting socket 1 and the lower mounting socket 3 respectively have only one gas inlet 7, thereby facilitating injection of the test gas and reducing a risk of air leakage at joints of the 5 testing tool.

[00114] It should be noted that during practical processing, after the upper gas-guide holes are drilled to penetrate the two short side plates on the upper mounting socket 1, and after the lower gas-guide holes are drilled to penetrate the two short side plates on the lower mounting socket 3, openings of the upper gas-guide holes on the two short side plates of the upper mounting socket 10 I and openings of the lower-gas guide hole on the two short side plates of the lower mounting socket 3 may be sealed via welding, so as to ensure that one gas inlet 7 forms an airtight communication chamber with the lower venting holes and the lower gas-guide holes, and the other gas inlet 7 forms an airtight communication chamber with the upper venting holes and the । upper gas-guide holes. In the embodiments, the lower differential pressure sensor core testing 15 seat 23 is configured to test one chamber of the differential pressure sensor core to-be-tested 4, ► and the upper differential pressure sensor core testing seat 28 is configured to test the other , chamber of the differential pressure sensor core to-be-tested 4, so as to ensure that when a । differential pressure sensor core to-be-tested 4 is clamped by the upper mounting socket 1 and the lower mounting socket 3, both the upper end and the lower end of the differential pressure 20 sensor core to-be-tested 4 can be in good communication with the test gas. As for which chamber of the differential pressure sensor core to-be-tested 4 is to be tested by the low differential pressure sensor core testing seat 23 and the upper differential pressure sensor core testing seat 28 respectively, there is no limitation herein. However, it needs to be ensured that chambers of the same type for all differential pressure sensor cores to-be-tested 4 are pressed 25 into the lower differential pressure sensor core testing seat 23 or the upper differential pressure sensor core testing seat 28, respectively.

[00115] In some embodiments of this application, a method of applying the foregoing testing tool is as follows. The handwheel 10 is rotated clockwise, so that the screw 9 synchronously rotates clockwise under driving of the handwheel 10, so as to drive the chain II and the 30 sprocket 18 to rotate; by this, the upper mounting socket 1 may be raised slowly, so that the lower mounting socket 3 is separated from the upper mounting socket 1. Rotation of the handwheel 10 is stopped when a distance between the lower mounting socket 3 and the upper mounting socket 1 reaches a distance sufficient for mounting differential pressure sensor cores to-be-tested 4, and a preset number of differential pressure sensor cores to-be-tested 4 are 5 mounted in the lower differential pressure sensor core testing seat 23. The number of the differential pressure sensor cores to-be-tested 4 needs to be equal to that of the lower differential pressure sensor core testing seats 23. Subsequently, the handwheel 10 is rotated counterclockwise, and the upper mounting socket 1 is lowered slowly until the differential pressure sensor cores to-be-tested 4 are pressed into the upper differential pressure sensor core 10 testing seats 28. By this, a mounting of the differential pressure sensor cores to-be-tested 4 is completed. Finally, test gas is injected into the testing tool through the gas inlets 7, so as to complete the testing of differential pressure sensor cores to-be-tested 4.

[00116] A process of disassembling differential pressure sensor cores to-be-tested 4 is a j process reverse to the mounting process, and details thereof are not described herein. 15

[00117] In some embodiments of this application, the two gas inlets 7 are respectively J connected to valves. One ends of the valves are connected to the gas inlets 7, and the other ends , of the two valves share one gas inlet via a tee joint and are connected to the gas pressure । controller, so that the gas pressure controller may provide a gas with a certain pressure to the two gas inlets 7 simultaneously or one at a time. 20

[00118] In some embodiments of this application, the valve described above may be a valve configuration such as an electromagnetic valve, a hydraulic valve, or a pneumatic valve.

[00119] In some embodiments of this application, the testing tool further includes an adjustable direct current power, to provide power for the differential pressure sensor cores to-be-tested 4.

[00120] According to a second aspect, an embodiment of this application further provides a 25 differential pressure sensor core testing method that is applied to any differential pressure sensor core testing tool described above. The method includes the following steps.

[00121] SI00. Obtaining all differential pressure sensor cores to-be-tested.

[00122] S200. For all differential pressure sensor cores to-be-tested, mounting the chambers of one pressure characteristic into a lower mounting socket 3, and mounting the chambers of the 30 other pressure characteristic into an upper mounting socket 1.

[00123] S300. Fastening the upper mounting socket 1 and the lower mounting socket 3 to ensure that all differential pressure sensor cores to-be-tested are clamped tightly.

[00124] S400. Adjusting a position of the testing tool, so that the upper mounting socket 1 and the lower mounting socket 3 are both horizontally oriented. 5

[00125] S500. Injecting a test gas with a set pressure into gas inlets 7 to test the differential pressure sensor cores to-be-tested.

[00126] In some embodiments of this application, tests are performed on the differential pressure sensor cores according to the following order: a mechanical fatigue screening test, a temperature shock aging screening test, an electrical shock aging screening test, an overload test, 10 a bidirectional static pressure error test, a static performance test, a temperature compensation test, compensation resistance welding, a temperature compensation verification test, and a stability test.

[00127] For ease of description, the testing processes are all described below by using an j example in which positive chambers of all differential pressure sensor cores to-be-tested 4 are 15 assembled into lower differential pressure sensor core testing seats 23, and negative chambers I of all differential pressure sensor cores to-be-tested 4 are assembled into upper differential , pressure sensor core testing seats 28. ।

[00128] A process of the foregoing mechanical fatigue screening test is as follows: mounting the differential pressure sensor cores to-be-tested 4 at room temperature; connecting two gas 20 inlets 7 to a fatigue generator, where one of the gas inlets 7 communicates with the positive chambers of the differential pressure sensor cores to-be-tested 4, and the other gas inlet 7 communicates with the negative chambers of the differential pressure sensor core to-be-tested 4; adjusting an output of the fatigue generator to a full scale pressure of the differential pressure sensor cores to-be-tested; and setting time intervals for pressure application and pressure relief 25 to be 2 seconds. After pressure application and pressure relief are alternatively performed for 5000 times for the two gas inlets 7, the tool is disassembled, and differential pressure sensor cores to-be-tested 4 with a damaged membrane and oil leakage are picked out. Moreover, the lower differential pressure sensor core testing seats 23 and the upper differential pressure sensor core testing seats 28 for the removed differential pressure sensor cores to-be-tested 4 are sealed 30 via choke plugs, so as to avoid gas leakage. In this way, mechanical fatigue screening for the differential pressure sensor cores to-be-tested 4 is completed.

[00129] A process of the foregoing temperature shock aging screening test is as follows: placing the testing tool assembled with the differential pressure sensor cores to-be-tested 4 into a high-low temperature test chamber; controlling the temperature in the high-low temperature 5 test chamber to make it change at a certain rate; at each set temperature point, after the temperature is stabilized, controlling a high-precision digital multimeter to measure an output signal of the differential pressure sensor cores to-be-tested 4, controlling an insulation resistance tester to measure insulation resistances of the differential pressure sensor cores to-be-tested 4, and controlling a leakage current tester to measure leakage currents of the differential pressure 10 sensor cores to-be-tested 4. Among which, the rate at which the temperature rises and falls is kept at 5°C / min, and a testing temperature and temperature stabilization duration are set according to the following processes:

[00130] maintaining at 25°C for 2 hours, maintaining at -55°C for 2 hours, and maintaining at +150°C for 2 hours; repeating this temperature cycling for four times;

[00131] maintaining at 25°C for 1.5 hours, maintaining at -55°C for 2 hours, and maintaining at +150°C for 2 hours; repeating this temperature cycling for five times; and

[00132] maintaining at 25°C for 1.5 hours, maintaining at -55°C for 12 hours, maintaining at 25°C for 2 hours, maintaining at 150°C for 12 hours; and maintaining at 25°C for 12 hours; repeating this temperature cycling twice. 20

[00133] The tool is disassembled after the temperature shock aging screening test, and differential pressure sensor cores to-be-tested 4 with oil leakage and unqualified electrical parameters are picked out. Moreover, the lower differential pressure sensor core testing seats 23 and the upper differential pressure sensor core testing seats 28 for the removed differential pressure sensor cores to-be-tested 4 are sealed via choke plugs, so as to avoid gas leakage. In 25 this way, temperature shock aging screening test for the differential pressure sensor cores to-be-tested 4 is completed.

[00134] A process of the foregoing electrical shock aging screening test is as follows: placing the testing tool assembled with the differential pressure sensor cores to-be-tested 4 into the high-low temperature test chamber; subsequently, controlling the high-low temperature test 30 chamber, so that temperature thereof is maintained at 60 °C; and controlling output voltage of an adjustable direct current power according to the following processes:

[00135] SI: controlling an output voltage of the adjustable direct current power, so that an upper power voltage limit of the differential pressure sensor cores to-be-tested 4 is continuously output for 2 hours; 5

[00136] S2: controlling the output voltage of the adjustable direct current power, so that a rated power voltage of the differential pressure sensor cores to-be-tested 4 is continuously output for 4 hours;

[00137] S3: controlling the output voltage of the adjustable direct current power, so that a lower power voltage limit of the differential pressure sensor cores to-be-tested 4 is continuously 10 output for 2 hours;

[00138] S4: repeating the processes of SI to S3 for 3 times, and cutting off power supply for 1 hour;

[00139] S5: repeating the process of S4 for 5 times; j

[00140] S6: controlling a high-precision digital multimeter to measure an output signal of the 15 differential pressure sensor core to-be-tested 4, controlling an insulation resistance tester to 1 measure an insulation resistance of the differential pressure sensor core to-be-tested 4, and , controlling a leakage current tester to measure a leakage current of the differential pressure । sensor core to-be-tested 4; and

[00141] S7: disassembling the tool and pick out differential pressure sensor cores to-be-tested 20 4 with unqualified electrical parameters; the lower differential pressure sensor core testing seats 23 and the upper differential pressure sensor core testing seats 28 for the removed differential pressure sensor cores to-be-tested 4 are sealed via choke plugs, so as to avoid gas leakage. In this way, the electrical shock aging screening test for the differential pressure sensor cores to-be-tested 4 is completed. 25

[00142] A method of employing the mechanical fatigue screening test, the temperature shock aging screening test, and the electrical shock aging screening test as described above may effectively release stress generated during a process of producing differential pressure sensor cores to-be-tested 4, thereby improving various performance parameters of the differential pressure sensor cores to-be-tested 4. 30

[00143] A process of the foregoing overload test is as follows: mounting the differential pressure sensor cores to-be-tested 4 at room temperature; measuring an output of the differential pressure sensor core to-be-tested 4 at zero-load first, and setting said output as a reference standard for an overload error. The overload test includes a positive-chamber overload test and a negative-chamber overload test. 5

[00144] Regarding the positive-chamber overload test: the gas inlet 7 of the lower mounting socket 3 is connected to the gas pressure controller, and the gas inlet 7 of the upper mounting socket 1 communicates with the atmosphere; an output of the gas pressure controller is adjusted to be twice of a full scale pressure of the differential pressure sensor core to-be-tested 4; maintaining said pressure for 5 minutes and then releasing the pressure; a zero-load output value 10 after overload is measured and recorded; and a change in the zero-load output of the differential pressure sensor core to-be-tested 4 before and after the overload test is collated to calculate an overload error of the positive chamber.

[00145] Regarding the negative-chamber overload test: the gas inlet 7 of the upper mounting j socket 1 is connected to the gas pressure controller, and the gas inlet 7 of the lower mounting 15 socket 3 communicates with the atmosphere; the output of the gas pressure controller is adjusted 1 to be twice of the full scale pressure of the differential pressure sensor core to-be-tested 4; , maintaining said pressure for 5 minutes and then releasing the pressure; a zero-load output value । after overload is measured and recorded; and a change in the zero-load output of the differential pressure sensor core to-be-tested 4 before and after the overload test is collated to calculate an 20 overload error of the negative chamber.

[00146] A process of the foregoing bidirectional static pressure error test is as follows.

[00147] Before the static pressure test, a zero-load output and a full-scale output of the differential pressure sensor core to-be-tested 4 are measured first, to serve as reference standards for a static pressure error. 25

[00148] The gas inlet 7 of the upper mounting socket 1 and the gas inlet 7 of the lower mounting socket 3 are connected to the same gas pressure controller. The output of the gas pressure controller is adjusted to a pressure required by a static-pressure index of the differential pressure sensor core to-be-tested 4. Static pressure is applied to the two gas inlets 7 simultaneously. A zero-load output value when the static pressure is applied is measured and 30 recorded. A change in the zero-load output of the differential pressure sensor core to-be-tested 4 before and after the static pressure is applied is collated to calculate a zero-load static pressure error.

[00149] The gas inlet 7 of the upper mounting socket 1 and the gas inlet 7 of the lower mounting socket 3 are connected to the same gas pressure controller. The output of the gas 5 pressure controller is adjusted to pressure required by a static-pressure index of the differential pressure sensor core to-be-tested 4. Static pressure is applied to the two gas inlets 7 simultaneously. After the static pressure is reached, the valve for the gas inlet 7 of the upper mounting socket 1 is turned off. Keeping applying pressure to the gas inlet 7 of the lower mounting socket 3 till full scale pressure is reached. A full-scale output value when the static 10 pressure is applied is measured and recorded. A change in full-scale output of the differential pressure sensor core to-be-tested 4 before and after the static pressure is applied is collated to calculate a full-scale static pressure error.

[00150] A method for the static performance test includes: a static performance test without static pressure for positive chamber, a static performance test with static pressure for positive chamber, a static performance test without static pressure for negative chamber, and a static performance test with static pressure for negative chamber. Items of the performance test includes nonlinearity, temperature hysteresis, repeatability, and comprehensive precision of the differential pressure sensor core to-be-tested 4.

[00151] Regarding the static performance test without static pressure for positive chamber: 20

[00152] At room temperature, the gas inlet 7 that communicates with the positive chamber of the differential pressure sensor core to-be-tested 4 is connected to a gas pressure controller, and the gas inlet 7 that communicates with the negative chamber of the differential pressure sensor core to-be-tested 4 communicates with the atmosphere. An output of the gas pressure controller is adjusted to apply 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of a full 25 scale pressure to the positive chamber of the differential pressure sensor core to-be-tested 4. A high-precision digital multimeter is controlled to measure and record an output value of the differential pressure sensor core to-be-tested 4. The foregoing pressurization testing process is further repeated twice for a total of three times. The output value of the differential pressure sensor core to-be-tested 4 is recorded. Static performance indexes of the nonlinearity, 30 temperature hysteresis, repeatability, and comprehensive precision of the positive chamber without static pressure of the differential pressure sensor core to-be-tested 4 are calculated.

[00153] Regarding the static performance test with static pressure for positive chamber:

[00154] At room temperature, the gas inlet 7 of the upper mounting socket 1 and the gas inlet 7 of the lower mounting socket 3 are connected to the same gas pressure controller. An output of 5 the gas pressure controller is adjusted to the pressure required by a static-pressure index of the differential pressure sensor core to-be-tested 4. Static pressure is applied to the two gas inlets 7 simultaneously. After the static pressure is reached, the valve for the gas inlet 7 that communicates with the negative chamber of the differential pressure sensor core to-be-tested 4 is turned off. Keeping applying pressure to the gas inlet 7 that communicates with the positive 10 chamber of the differential pressure sensor core to-be-tested 4. Based on the static pressure, additional 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of the full-scale differential pressure is applied to the positive chamber of the differential pressure sensor core to-be-tested 4. A high-precision digital multimeter is controlled to measure and record an output value of the differential pressure sensor core to-be-tested 4. The foregoing pressurization testing process is further repeated twice for a total of three times. The output value of the differential pressure sensor core to-be-tested 4 is recorded. Static performance indexes of the nonlinearity, temperature hysteresis, repeatability, and comprehensive precision of the positive chambers under static pressure of the differential pressure sensor core to-be-tested 4 are calculated.

[00155] Regarding the static performance test without static pressure for negative chamber: 20

[00156] At room temperature, the gas inlet 7 that communicates with the negative chamber of the differential pressure sensor core to-be-tested 4 is connected to a gas pressure controller, and the gas inlet 7 that communicates with the chamber chamber of the differential pressure sensor core to-be-tested 4 communicates with the atmosphere. An output of the gas pressure controller is adjusted to apply 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of a foil 25 scale pressure to the negative chamber of the differential pressure sensor core to-be-tested 4. A high-precision digital multimeter is controlled to measure and record an output value of the differential pressure sensor core to-be-tested 4. The foregoing pressurization testing process is further repeated twice for a total of three times. The output value of the differential pressure sensor core to-be-tested 4 is recorded. Static performance indexes of the nonlinearity, 30 temperature hysteresis, repeatability, and comprehensive precision of the negative chamber without static pressure of the differential pressure sensor core to-be-tested 4 are calculated.

[00157] Regarding the static performance test with static pressure for negative chamber:

[00158] At room temperature, the gas inlet 7 of the upper mounting socket 1 and the gas inlet 7 of the lower mounting socket 3 are connected to the same gas pressure controller. An output of 5 the gas pressure controller is adjusted to the pressure required by a static-pressure index of the differential pressure sensor core to-be-tested 4. Static pressure is applied to the two gas inlets 7 simultaneously. After the static pressure is reached, the valve for the gas inlet 7 that communicates with the positive chamber of the differential pressure sensor core to-be-tested 4 is turned off. Keeping applying pressure to the gas inlet 7 that communicates with the negative 10 chamber of the differential pressure sensor core to-be-tested 4. Based on the static pressure, additional 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of the full-scale differential pressure is applied to the negative chamber of the differential pressure sensor core to-be-tested 4. A high-precision digital multimeter is controlled to measure and record an output । value of the differential pressure sensor core to-be-tested 4. The foregoing pressurization testing 15 process is further repeated twice for a total of three times. The output value of the differential ► pressure sensor core to-be-tested 4 is recorded. Static performance indexes of the nonlinearity, , temperature hysteresis, repeatability, and comprehensive precision of the negative chamber । under static pressure of the differential pressure sensor core to-be-tested 4 are calculated.

[00159] A process of the foregoing temperature compensation test is as follows: 20

[00160] Placing the testing tool assembled with the differential pressure sensor core to-be-tested 4 into a high-low temperature test chamber; connecting the gas inlet 7 that communicates with the positive chamber of the differential pressure sensor core to-be-tested 4 to a gas pressure controller, while enabling the gas inlet 7 that communicates with the negative chamber of the differential pressure sensor core to-be-tested 4 to communicate with the 25 atmosphere; controlling the high-low temperature test chamber, so that temperature thereof is maintained at -55°C, 25°C, and 150°C, respectively; at each specific temperature, after the temperature has been maintained for 2 hours, controlling the gas pressure controller to output a pressure of 0 MPa; measuring and recording a zero-load output value of the differential pressure sensor core to-be-tested 4 and the resistance values of four resistors thereof; controlling the gas 30 pressure controller to output a full scale pressure; measuring and recording an output of the differential pressure sensor core to-be-tested 4 and the resistance values of the four resistors at full scale after the full scale pressure has been stabilized; and releasing the pressure after the test ends; and

[00161] based on the outputs of the differential pressure sensor core to-be-tested 4 and the 5 resistance values of the four resistors at the three specific temperatures that have been recorded in the foregoing tests, calculating a compensation resistance value according to a temperature compensation formula, and disassembling the sensor testing tool.

[00162] A process of the foregoing compensation resistance welding is as follows:

[00163] welding a compensation resistor onto the differential pressure sensor core to-be-tested 10 4 based on the compensation resistance value obtained from the temperature compensation test.

[00164] A process of the foregoing temperature compensation verification test is as follows:

[00165] Placing the differential pressure sensor core to-be-tested 4 welded with the compensation resistor into the testing tool, then placing the testing tool into the high-low temperature test chamber; connecting the gas inlet 7 of the lower mounting socket 3 to the gas pressure controller, while communicating the gas inlet 7 of the upper mounting socket 1 with the atmosphere; controlling the high-low temperature test chamber, so that temperature thereof is controlled according to a sequence of -55 °C, 25 °C, 150 °C, and 25 °C, where the temperature is kept constant for two hours at each temperature point; controlling the gas pressure controller to output a zero-load pressure and a full scale pressure of the differential 20 pressure sensor core to-be-tested 4 at each temperature point; and controlling the high-precision digital multimeter to measure a zero-load output and a full-scale output of the differential pressure sensor core to-be-tested 4, so as to calculate a sensitivity of the differential pressure sensor core to-be-tested 4.

[00166] A zero-load temperature drift of the differential pressure sensor core to-be-tested 4 is 25 calculated based on the zero-load output value of the differential pressure sensor core to-be-tested 4 that is tested at temperature conditions of -55 °C, 25 °C, and 150 °C.

[00167] A sensitivity temperature drift of the differential pressure sensor core to-be-tested 4 is calculated based on a sensitivity output value of the differential pressure sensor core to-be-tested 4 that is tested at temperature conditions of -55 °C, 25 °C, and 150 °C. 30

[00168] A temperature hysteresis of the differential pressure sensor core to-be-tested 4 is calculated based on a difference between the two zero-load outputs at 25 °C that are measured above.

[00169] The foregoing stability test includes a zero-load stability test and a full-scale stability test. The testing process is as follows.

[00170] Regarding the zero-load stability test: the high-low temperature test chamber is controlled, so that the temperature thereof is controlled according to a sequence of -55°C, 25°C, and 150°C, where the temperature is kept constant for eight hours at each temperature point. A zero-load output of the differential pressure sensor core to-be-tested 4 is measured at each temperature point, and the zero-load output is recorded every one hour; and the zero-load stability of the differential pressure sensor core to-be-tested 4 is calculated based on these test data.

[00171] Regarding the full-scale stability test: the gas inlet 7 of the lower mounting socket 3 is connected to the gas pressure controller, while the gas inlet 7 of the upper mounting socket 1 is communicated with the atmosphere. The high-low temperature test chamber is controlled, so that the temperature thereof is controlled according to a sequence of -55 °C, 25 °C, and 150 °C, where the temperature is kept constant for eight hours at each temperature point. The full scale pressure of the differential pressure sensor core to-be-tested 4 is applied to the gas inlet 7 of the lower mounting socket 3 at each temperature point; a full-scale output of the differential pressure sensor core to-be-tested 4 is measured, and the zero-load output is recorded every one hour; the full-scale stability of the differential pressure sensor core to-be-tested 4 is calculated based on these test data.

[00172] It may be learned from the foregoing solutions that according to the testing tool and the testing method for a differential pressure sensor core that are provided in this application, the differential pressure sensor core to-be-tested 4 is mounted between the upper mounting socket 1 and the lower mounting socket 3 of the tool, and the upper mounting socket 1 and the lower mounting socket 3 are fastened so as to ensure that the differential pressure sensor core to-be-tested 4 is in a clamped state. Subsequently, the test gas is injected through the gas inlet 7 disposed outside the differential pressure sensor core testing tool to perform a test on the differential pressure sensor core to-be-tested 4 and obtain a testing result. According to this application, the upper mounting socket 1 and the lower mounting socket 3 are used for clamping the differential pressure sensor core, and venting holes as well as gas-guide holes that communicate with each other in an airtight way are provided in the upper mounting socket 1 and the lower mounting socket 3, so that the operator can perform tests on a plurality of differential pressure sensor cores to-be-tested 4 at the same time after the test gas is injected into 5 the gas inlet. In this way, testing precision and efficiency are improved, and the problem that air leakage is easily caused due to a plurality of intake pipe joints is resolved,

[00173] The terms "a plurality of embodiments", "some embodiments", "one embodiment", or "embodiment" mentioned throughout this specification mean that a component or a feature described in combination with the embodiments is included in at least one embodiment. 10 Therefore, the phrases such as "in a plurality of embodiments", "in some embodiments", "in at least one another embodiment", or "in an embodiment" that appear throughout this specification may not necessarily refer to same embodiments. In addition, in one or more embodiments, CM specific features, components, or features can be combined in any suitable manner. Therefore, without limitation, specific features, components, or features illustrated or described in combination with one embodiment can be entirely or partially combined with features, components, or features of one or more other embodiments. Such modification and variation are intended to fall within the scope of this application.

[00174] For similar parts between the embodiments provided in this application, reference can be made to each other. The specific implementations described above are merely some 20 examples under a general concept of this application, and do not constitute any limitation to the protection scope of this application. For a person skilled in the art, any other implementations derived according to the solutions of this application without an effective effort all fall within the protection scope of this application.

Claims

1. A testing tool for differential pressure sensor core, wherein the tool comprises a lower mounting socket (3) and an upper mounting socket (1) that can be engaged with each other, and a 5 plurality of guide shafts (2); wherein the lower mounting socket (3) comprises two opposite long side plates, two opposite short side plates, and a bottom plate, and the upper mounting socket (1) comprises other two opposite long side plates, other two opposite short side plates, and a top plate; when the lower mounting socket (3) is engaged with the upper mounting socket (1), the two long side plates of the lower mounting socket (3) are engaged with the corresponding two 10 long side plates of the upper mounting socket (1) to form several apertures , and the two short side plates of the lower mounting socket (3) are engaged with the corresponding two short side plates of the upper mounting socket (1) to form more apertures;wherein the guide shafts (2) perpendicularly pass through the upper mounting socket (1)and are mounted onto the lower mounting socket (3); guide-shaft through holes (26) for the( Q15 guide shafts (2) to pass through are provided in a base portion of the upper mounting socket (1);guide-shaft fixing bases (21) for mounting the guide shafts (2) are provided on a base portion of the lower mounting socket (3); positions of the guide-shaft through holes (26) are corresponded to those of the guide-shaft fixing bases (21), respectively; a linear bearing (8) is further provided in the guide-shaft through hole (26) such that the guide shaft (2) runs through the linear bearing20(8);the guide-shaft fixing base (21) is of a cylindrical recess structure; the guide-shaft fixing bases (21) are connected to each other via a plate-like structure along the short side plate of the lower mounting socket (3);the upper mounting socket (1) is provided with a plurality of upper differential pressure 25 sensor core testing seats (28) that are provided with upper venting holes; a plurality of lower differential pressure sensor core testing seats (23) are provided on four corners of the lower mounting socket (3) and on the long side plates of the lower mounting socket (3); positions of the upper differential pressure sensor core testing seats (28) are corresponded to these of the lower differential pressure sensor core testing seats (23), respectively; and a number of the upperdifferential pressure sensor core testing seats (28) is same as that of differential pressure sensor cores to-be-tested (4);two lower positioning pin bases (24) are respectively disposed on a short side plate of the lower mounting socket (3); two upper positioning pin bases (29) are respectively disposed on a 5 short side plate of the upper mounting socket (1); and positions of the upper positioning pin bases (29) are corresponded to those of the lower positioning pin bases (24), respectively;lower venting holes are provided on the lower differential pressure sensor core testing seat (23); and a number of the lower differential pressure sensor core testing seats (23) is same as that of the differential pressure sensor cores to-be-tested (4);10 the lower mounting socket (3) and the upper mounting socket (1) are both provided with gas inlets (7) in a direction parallel to the apertures;one of the gas inlets (7) passes through one long side plate of the lower mounting socket (3), and terminates at the other long side plate of the lower mounting socket (3);the other gas inlet (7) passes through one long side plate of the upper mounting socket (1), and terminates at the other long side plate of the upper mounting socket (1);the two gas inlets (7) are connected to respective valves, wherein one end of respective valves is connected to the gas inlet (7), and the other end is connected to a gas pressurecontroller;the plurality of the differential pressure sensor cores to-be-tested (4) are mounted between 20 the lower mounting socket (3) and the upper mounting socket (1); upper gas-guide holes are further provided on the short side plates of the upper mounting socket (1), and lower gas-guide holes are further provided on the short side plates of the lower mounting socket (3); one of the gas inlets (7) forms an airtight communication chamber with the respective upper venting holes and the upper gas-guide holes; and the other gas inlet (7) forms an airtight communication 25 chamber with the respective lower venting holes and lower gas-guide holes;one end of each differential pressure sensor core to-be-tested (4) is provided with a positive chamber, and the other end is provided with a negative chamber; four resistors are provided within each differential pressure sensor core to-be-tested (4), and signals of the four resistors areled out via signal output lines; and each differential pressure sensor core to-be-tested (4) has five signal output lines;the testing tool further comprises an adjustable direct current power that provides power for the differential pressure sensor cores to-be-tested (4);5 at room temperature, when the testing tool performs a mechanical fatigue screening test, the two gas inlets (7) are respectively connected to a fatigue generator, wherein one of the gas inlets (7) communicates with the positive chamber of the differential pressure sensor core to-be-tested (4), and the other gas inlet (7) communicates with the negative chamber of the differential pressure sensor core to-be-tested (4); the fatigue generator outputs a foil scale pressure for the 10 differential pressure sensor core to-be-tested (4); and a time interval for pressure application andpressure relief of the fatigue generator is set to be 2 seconds; andwherein during the mechanical fatigue screening test, the testing tool alternately performs pressure application and pressure relief for 5000 times respectively on the two gas inlets (7) via ' the fatigue generator.115j 2. The testing tool for differential pressure sensor core according to claim 1, wherein thetesting tool further comprises two screws (9);the upper mounting socket (1) is further provided with two screw through holes (27) for the screws (9) to pass through, with respective screw through holes (27) being located between the 20 guide-shaft through holes (26) along the short side plate of the upper mounting socket (1);two screw nuts (16) with an internal thread structure matching with an external thread of the screw (9) are correspondingly provided to cover the respective screw through hole (27) on the upper mounting socket (1); the screw nuts (16) cover the screw through holes (27) and are fixed on the upper mounting socket (1);25 the lower mounting socket (3) is provided with upper tapered roller bearing mounts (14) and lower tapered roller bearing mounts (15); each upper tapered roller bearing mounts (14) and each lower tapered roller bearing mount (15) has a cylindrical bored-configuration;an upper tapered roller bearing (12) is provided in each upper tapered roller bearing mount(14), and a lower tapered roller bearing (13) is provided in each lower tapered roller bearing mount (15); andeach screw (9) is screwed into respective screw nut (16) via thread, sequentially passes through the upper tapered roller bearing (12) and the lower tapered roller bearing (13), and is 5 tightly locked together with the lower tapered roller bearing (13) at a bottom end of the screw (9) via a fixing nut (17).

3. The testing tool for differential pressure sensor core according to claim 2, wherein the two screws (9) are both further provided with keyways; each one of two screws (9) is provided 10 with a sprocket (18) fitted therearound, with each sprocket (18) being provided with a keyway structure that matches with the keyway on the corresponding screw (9); for each screw (9), a square key is disposed in a space enclosed by the keyway structure on the sprocket (18) and the keyway on the screw (9), and the sprocket (18) is connected to the screw (9) via the square key;Iand►15 a chain (11) wraps around the two sprockets (18), wherein the chain (11) meshes with the , sprocket (18).I4. The testing tool for differential pressure sensor core according to claim 2, wherein one of the two screws (9) is further provided with a handwheel (10); and20 a circular ring structure is provided at the center of the handwheel (10); a key way structure that matches with the keyway on the screw (9) is provided on the circular ring; a square key is disposed in a space enclosed by the keyway structure on the handwheel (10) and the keyway on the screw (9); and the handwheel (10) is connected to the screw (9) via the square key.25 5. The testing tool for differential pressure sensor core according to claim 1, wherein aninternal thread is provided in each lower positioning pin base (24);each upper positioning pin base (29) is aligned with respect to the corresponding lower positioning pin base (24) via a positioning pin;one end of the positioning pin is provided with an external thread that matches the internal thread of the lower positioning pin base (24); andthe positioning pin is connected to the lower positioning pin base (24) via the thread.5 6. A testing method for differential pressure sensor core using the testing tool for differentialpressure sensor core according to any one of claims 1 to 5, wherein the method comprises;obtaining all differential pressure sensor cores to-be-tested (4), wherein for each differential pressure sensor core to-be-tested (4), one end thereof is a positive chamber, and the other end is a negative chamber;10 for all differential pressure sensor cores to-be-tested (4), mounting the chambers of one pressure characteristic into a lower mounting socket (3), and mounting the chambers of the other pressure characteristic into an upper mounting socket (1);'M"CM fastening the upper mounting socket (1) and the lower mounting socket (3) to ensure that allCO differential pressure sensor cores to-be-tested (4) are clamped tightly;5 adjusting a position of the testing tool, so that the upper mounting socket (1) and the lower CM mounting socket (3) are both horizontally oriented; andinjecting a test gas with a set pressure into a gas inlet (7) to perform a mechanical fatigue screening test on the differential pressure sensor core to-be-tested (4), whereinat room temperature, when the testing tool performs the mechanical fatigue screening test, 20 all differential pressure sensor cores to-be-tested (4) are mounted such that two gas inlets (7) are connected to a fatigue generator, wherein one of the gas inlets (7) communicates with the positive chambers of the differential pressure sensor cores to-be-tested (4), and the other gas inlet (7) communicates with the negative chambers of the differential pressure sensor cores to-be-tested (4); an output of the fatigue generator is adjusted to a full scale pressure of the 25 differential pressure sensor core to-be-tested (4); a time interval for pressure application and pressure relief is set to be 2 seconds; and pressure application and pressure relief are alternatively performed for 5000 times via the two gas inlets (7).

7. The testing method for differential pressure sensor core according to claim 6, wherein the method further comprises:performing a temperature shock aging screening test, an electrical shock aging screening test, an overload test, a bidirectional static pressure error test, a static performance test, a 5 temperature compensation test, a temperature compensation verification test, and a stability test on the differential pressure sensor cores to-be-tested (4).

8. The testing method for differential pressure sensor core according to claim 7, wherein a method for the temperature shock aging screening test comprises:10 placing the testing tool assembled with the differential pressure sensor cores to-be-tested (4) into a high-low temperature test chamber; controlling temperature of the high-low temperature test chamber; and at each temperature point, after the temperature is stabilized, controlling a। high-precision digital multimeter to measure output signals of the differential pressure sensor cores to-be-tested (4), controlling an insulation resistance tester to measure insulation resistances►15 of the differential pressure sensor cores to-be-tested (4), and controlling a leakage current tester , to measure leakage currents of the differential pressure sensor cores to-be-tested (4), wherein a । temperature rise and fall rate is kept at 5°C / min, and a testing temperature point and temperature stabilization duration are set according to the following processes:maintaining at 25°C for 2 hours; maintaining at -55°C for 2 hours; and maintaining at 20 +150°C for 2 hours; repeating this temperature cycling for four times;maintaining at 25°C for 1.5 hours; maintaining at -55°C for 2 hours; and maintaining at +150°C for 2 hours; repeating this temperature cycling for five times; andmaintaining at 25°C for 1.5 hours; maintaining at -55°C for 12 hours; maintaining at 25°C for 2 hours; maintaining at 150°C for 12 hours; and maintaining at 25°C for 12 hours; repeating 25 this temperature cycling twice.

9. The testing method for differential pressure sensor core according to claim 7, wherein a method for the electrical shock aging screening test comprises:placing the testing tool assembled with the differential pressure sensor cores to-be-tested (4) into a high-low temperature test chamber; subsequently, controlling the high-low temperature test chamber, so that a temperature thereof is stabilized at 60°C; and controlling output voltage of an adjustable direct current power according to the following processes:5 SI: controlling the output voltage of the adjustable direct current power, so that an upper power voltage limit for the differential pressure sensor cores to-be-tested (4) is continuously output for 2 hours;S2: controlling the output voltage of the adjustable direct current power, so that a rated power voltage for the differential pressure sensor cores to-be-tested (4) is continuously output for 10 4 hours;S3: controlling the output voltage of the adjustable direct current power, so that a lower power voltage limit for the differential pressure sensor cores to-be-tested (4) is continuously output for 2 hours;IS4: repeating the processes of SI to S3 for 3 times, then turning off power supply for 1 115 hour;j S5: repeating the process of S4 for 5 times; andS6: controlling a high-precision digital multimeter to measure output signals of the differential pressure sensor cores to-be-tested (4), controlling an insulation resistance tester to measure insulation resistances of the differential pressure sensor cores to-be-tested (4), and 20 controlling a leakage current tester to measure leakage currents of the differential pressure sensor cores to-be-tested (4).

10. The testing method for differential pressure sensor core according to claim 7, wherein a method for the static performance test comprises a static performance test without static pressure 25 for positive chamber, a static performance test with static pressure for positive chamber, a static performance test without static pressure for negative chamber, and a static performance test with static pressure for negative chamber; wherein items of the performance test comprises nonlinearity, temperature hysteresis, repeatability, and comprehensive precision of thedifferential pressure sensor cores to-be-tested (4), whereina process of the static performance test without static pressure for positive chamber comprises:connecting the gas inlet (7) that communicates with the positive chambers of the5 differential pressure sensor cores to-be-tested (4) to a gas pressure controller, and enabling the gas inlet (7) that communicates with the negative chambers of the differential pressure sensor cores to-be-tested (4) to communicate with the atmosphere; adjusting an output of the gas pressure controller to apply 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of a full scale pressure to the positive chambers of the differential pressure sensor10 cores to-be-tested (4); and controlling a high-precision digital multimeter to measure and record output values of the differential pressure sensor cores to-be-tested (4) and recording the output value; andrepeating the foregoing pressurization testing process twice for a total of three times,C\Jrecording the output values of the differential pressure sensor cores to-be-tested (4), and ^^15 calculating static performance indexes of the nonlinear, the temperature hysteresis, the repeatability, and the comprehensive precision of the positive chambers without staticCM pressure for the differential pressure sensor cores to-be-tested (4);a process of the static performance test with static pressure for positive chamber comprises:connecting the gas inlet (7) of the upper mounting socket (1) and the gas inlet (7) of the20 lower mounting socket (3) to the same gas pressure controller; adjusting an output of the gas pressure controller to a pressure required by a static-pressure index of the differential pressure sensor cores to-be-tested (4); applying static pressure to the two gas inlets (7) simultaneously; after the static pressure is reached, turning off a valve of the gas inlet (7) that communicates with the negative chambers of the differential pressure sensor cores25 to-be-tested (4); continuing to apply pressure to the gas inlet (7) that communicates with the positive chambers of the differential pressure sensor cores to-be-tested (4); based on the static pressure, applying additional 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of the full-scale differential pressure to the positive chambers of the differential pressure sensor cores to-be-tested (4); controlling a high-precision digital multimeter tomeasure and record output values of the differential pressure sensor cores to-be-tested (4); repeating the foregoing pressurization testing process twice for a total of three times; recording the output values of the differential pressure sensor cores to-be-tested (4); and calculating static performance indexes of the nonlinear, temperature hysteresis, repeatability,5 and comprehensive precision of the positive chambers under static pressure for the differential pressure sensor core to-be-tested (4);a process of the static performance test without static pressure for negative chamber comprises:10connecting the gas inlet (7) that communicates with the negative chambers of the differential pressure sensor cores to-be-tested (4) to a gas pressure controller, and enabling the gas inlet (7) that communicates with the positive chambers of the differential pressure sensor cores to-be-tested (4) to communicate with the atmosphere; adjusting an output of the gas pressure controller to apply 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of a full scale pressure to the negative chambers of the differential pressure sensor cores to-be-tested (4); controlling a high-precision digital multimeter to measure and record output values of the differential pressure sensor cores to-be-tested (4); repeating the foregoing pressurization testing process twice for a total of three times; recording the output values of the differential pressure sensor core to-be-tested (4); and calculating static performance indexes of the nonlinear, temperature hysteresis, repeatability, and comprehensive precision of the negative chamber without static pressure for the differential pressure sensor cores to-be-tested (4); anda process of the static performance test with static pressure for negative chamber comprises:connecting the gas inlet (7) of the upper mounting socket (1) and the gas inlet (7) of the lower mounting socket (3) to the same gas pressure controller; adjusting an output of the gas25 pressure controller to a pressure required by a static-pressure index of the differential pressure sensor cores to-be-tested (4); applying static pressure to the two gas inlets (7) simultaneously; after the static pressure is reached, turning off a valve of the gas inlet (7) that communicates with the positive chambers of the differential pressure sensor cores to-be-tested (4); continuing to apply pressure to the gas inlet (7) that communicates with thenegative chambers of the differential pressure sensor cores to-be-tested (4); based on the static pressure, applying additional 0%, 20%, 40%, 60%, 80%, 100%, 80%, 60%, 40%, 20%, and 0% of a full-scale differential pressure to the negative chambers of the differential pressure sensor cores to-be-tested (4); controlling a high-precision digital multimeter to5 measure and record output values of the differential pressure sensor cores to-be-tested (4); repeating the foregoing pressurization testing process twice for a total of three times; recording the output values of the differential pressure sensor cores to-be-tested (4); and calculating static performance indexes of the nonlinear, temperature hysteresis, repeatability, and comprehensive precision of the negative chamber under static pressure for the10 differential pressure sensor cores to-be-tested (4).

11. The testing method for differential pressure sensor core according to claim 7, wherein amethod for the temperature compensation test comprises:placing the testing tool assembled with the differential pressure sensor cores to-be-tested (4) into a high-low temperature test chamber; connecting the gas inlet (7) that communicates with the positive chambers of the differential pressure sensor cores to-be-tested (4) to a gas pressure controller, and enabling the gas inlet (7) that communicates with the negative chambers of thedifferential pressure sensor cores to-be-tested (4) to communicate with the atmosphere; controlling the high-low temperature test chamber, so that temperature thereof is stabilized at 20 -55°C, 25°C, and 150°C, respectively; at each temperature point, after the temperature has beenmaintained for 2 hours, controlling the gas pressure controller to output a pressure of 0 MPa; for each differential pressure sensor core to-be-tested (4), measuring and recording a zero-load output value and resistance values of four resistors thereof; controlling the gas pressure controller to output a full scale pressure, and for each differential pressure sensor core 25 to-be-tested (4), measuring and recording an output thereof and the resistance values of the four resistors at full scale after the full scale pressure has been stabilized; and releasing the pressure after the test ends; andfor each differential pressure sensor core to-be-tested (4), based on the recorded outputs thereof at the three specific temperature points and the resistance values of the four resistors,calculating a compensation resistance value according to a temperature compensation formula.CM

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