A parameter-adjustable square wave pressure calibration device and method

Abstract

The application discloses a parameter-adjustable square wave pressure calibration device and method, and relates to the technical field of pressure calibration devices, which can realize high-pressure, high-frequency and large-amplitude regular pressure square waves.

Description

Technical Field

[0001] This invention belongs to the field of pressure calibration technology, and more specifically, relates to a square wave pressure calibration device and method with adjustable parameters. Background Technology

[0002] Currently, pressure sensors, pressure vessels, pressure valves and other pressure equipment are widely used in various industries. In order to ensure that their values ​​are accurate and reliable, these instruments, sensors and transmitters need to be calibrated and tested regularly before and after leaving the factory. This includes pressure resistance performance, fatigue life test, reliability test and qualification. The pressure resistance, life, reliability and other performance are tested by alternating high and low pressure.

[0003] Dynamic pressure calibration typically employs two methods: step pressure and sinusoidal pressure. Square wave pressure calibration offers a novel approach to dynamic pressure calibration, combining the advantages of both methods. Step pressure calibration can only test the rise time, resonant frequency, and static sensitivity of a pressure sensor, while sinusoidal pressure calibration can only test the amplitude and phase of a single frequency point. Square wave pressure calibration, however, can test not only the rise time, resonant frequency, and static sensitivity, but also the amplitude at multiple frequency points. However, current technology struggles to produce high-pressure, high-frequency, and regularly amplitude square waves, hindering the effective application of square wave pressure calibration. Summary of the Invention

[0004] The purpose of this invention is to provide a square wave pressure calibration device and method with adjustable parameters, which can solve the problem that it is difficult to achieve high pressure, high frequency, and large amplitude regular pressure square waves in the prior art.

[0005] To achieve the above objectives, one aspect of the present invention provides a square wave pressure calibration device with adjustable parameters, comprising: a gas source assembly for providing the gas required for calibration; a first pressure regulator disposed on an upper pressure line and connected to the gas source assembly for adjusting the gas provided by the gas source assembly to an upper pressure standard gas; a second pressure regulator disposed on a lower pressure line and connected to the gas source assembly for adjusting the gas provided by the gas source assembly to a lower pressure standard gas, wherein the lower pressure line and the upper pressure line are connected in parallel; and a square wave generating assembly for generating square waves. The pressure generating component includes a two-position three-way valve and a signal generating element. The downstream ends of the upper limit pressure line and the lower limit pressure line are respectively connected to the two-position three-way valve. The signal generating element is electrically connected to the two-position three-way valve and is used to control the periodic opening and closing of the two-position three-way valve, so that the upper and lower limit standard gases are output alternately to form a square wave pulsating pressure. The output component includes an output line and a test port. One end of the output line is connected to the two-position three-way valve, and the other end is provided with a test port. The part to be calibrated is connected to the test port. The pressure relief and exhaust line has one end connected to the second pressure regulating element and the other end provided with an exhaust port.

[0006] Furthermore, the square wave pressure calibration device also includes a first gas container, which is disposed between the first pressure regulator and the two-position three-way valve.

[0007] Furthermore, the square wave pressure calibration device also includes a second gas container, which is disposed between the second pressure regulator and the two-position three-way valve.

[0008] Furthermore, the square wave pressure calibration device also includes a vacuum pump, which is installed on the pressure relief and exhaust pipeline.

[0009] Furthermore, the square wave pressure calibration device also includes a third gas container, which is located on the depressurization exhaust pipe and upstream of the vacuum pump.

[0010] Furthermore, the square wave pressure calibration device also includes a first pressure sensor, which is located downstream of the gas source assembly and is used to detect the output pressure of the gas source assembly.

[0011] Furthermore, the square wave pressure calibration device also includes a second pressure sensor, which is located downstream of the two-position three-way valve and is used to detect the pressure at the test port.

[0012] Furthermore, the square wave pressure calibration device also includes a controller, which is electrically connected to the first pressure regulator, the second pressure regulator, and the signal generating element.

[0013] Furthermore, the gas source assembly includes a high-pressure gas source and a pressure reducing valve. The high-pressure gas source provides high-pressure gas as input to the first pressure regulator and the second pressure regulator, and the pressure reducing valve reduces the pressure of the gas output from the high-pressure gas source.

[0014] Another aspect of the present invention provides a square wave pressure calibration method with adjustable parameters, which uses the above-mentioned square wave pressure calibration device to perform square wave pressure calibration. The square wave pressure calibration method includes: Step S1: Adjusting the output pressure of the first pressure regulator to the upper limit pressure value of the square wave, so that the gas in the upper limit pressure pipeline is adjusted to the upper limit standard gas, and adjusting the output pressure of the second pressure regulator to the lower limit pressure value of the square wave, so that the gas in the lower limit pressure pipeline is adjusted to the lower limit standard gas; Step S2: Controlling a two-position three-way valve to connect separately to the upper limit pressure pipeline through a signal generating element, so that the upper limit standard gas enters the output pipeline and outputs the upper limit pressure of the square wave; Step S3: Controlling a two-position three-way valve to connect separately to the lower limit pressure pipeline through a signal generating element, so that the upper limit standard gas in the output pipeline enters the lower limit pressure pipeline and is depressurized and discharged through the depressurization and exhaust pipeline until the lower limit pressure pipeline returns to the lower limit pressure value of the square wave, and the lower limit standard gas enters the output pipeline and outputs the lower limit pressure of the square wave; Step S4: Repeating steps S2 and S3 according to a preset square wave signal, thereby outputting a square wave pulse pressure to perform square wave pressure calibration on the part to be calibrated.

[0015] According to the adjustable square wave pressure calibration device and method of the present invention, the upper and lower limits of the square wave pulse pressure and the frequency and other parameters can be adjusted according to the usage requirements, thereby obtaining the required high pressure, high frequency and large amplitude regular pressure square wave, solving the problem that it is difficult to achieve high pressure, high frequency and large amplitude regular pressure square wave in the prior art. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0017] Figure 1 This is a schematic diagram of the structure of a parameter-adjustable square wave pressure calibration device according to an embodiment of the present invention;

[0018] Figure 2 This is a flowchart of a parameter-adjustable square wave pressure calibration method according to an embodiment of the present invention;

[0019] The above figures include the following reference numerals:

[0020] 1. Gas source port; 2. First pressure sensor; 3. First pressure regulator; 4. First gas container; 5. Two-position three-way valve; 6. Second pressure sensor; 7. Second pressure regulator; 8. Second gas container; 9. Third gas container; 10. Vacuum pump; 11. Signal generating element; 12. Exhaust port; 13. Test port; 14. Upper limit pressure pipeline; 15. Lower limit pressure pipeline; 16. Pressure relief exhaust pipeline; 17. Output pipeline. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] One embodiment of the present invention provides a square wave pressure calibration device with adjustable parameters. For example... Figure 1 As shown, the adjustable square wave pressure calibration device of this invention includes a gas source assembly, a first pressure regulator 3, a second pressure regulator 7, a square wave generator assembly, and an output assembly. The gas source assembly provides the gas required for calibration. The first pressure regulator 3 is located on the upper limit pressure line 14 and connected to the gas source assembly, used to adjust the gas provided by the gas source assembly to the upper limit standard gas. The second pressure regulator 7 is located on the lower limit pressure line 15 and connected to the gas source assembly, used to adjust the gas provided by the gas source assembly to the lower limit standard gas. The lower limit pressure line 15 is connected in parallel with the upper limit pressure line 14. The square wave generator assembly includes a two-position three-way valve 5 and a signal generating element 11. The downstream ends of the upper limit pressure line 14 and the lower limit pressure line 15 are connected to the two-position three-way valve 5. The signal generating element 11 is electrically connected to the two-position three-way valve 5, used to control the periodic opening and closing of the two-position three-way valve 5, so that the upper and lower limit standard gases are output alternately to form a square wave pulsating pressure. The output assembly includes a test port 13, and the device to be calibrated is connected to the test port 13.

[0023] By utilizing a high-pressure gas source to generate high-pressure output gas, two pressure pipelines can output upper and lower limit standard gases respectively, thereby outputting square wave upper and lower limit pressures. The signal generating element 11 periodically controls the opening and closing of the two-position three-way valve 5 according to a preset square wave signal, causing the upper and lower limit standard gases to be output alternately, forming an accurate and distortion-free square wave pulse pressure. The upper and lower limits of the square wave pulse pressure, as well as parameters such as frequency, can be automatically adjusted according to usage requirements, thereby obtaining the required high-pressure, high-frequency, and large-amplitude regular pressure square wave. This allows for the use of a reliable square wave pulsating pressure source in pressure resistance performance, fatigue life testing, and reliability testing of various pressure equipment such as pressure sensors, pressure vessels, and pressure valves. Furthermore, when the square wave pulsating pressure source is used for dynamic pressure calibration, it can not only test the rise time, resonant frequency, and static sensitivity of the pressure sensor, but also test the amplitude of multiple frequency points of the pressure sensor.

[0024] In this embodiment, the gas source assembly includes a high-pressure gas source and a pressure reducing valve. The high-pressure gas source provides a high-pressure gas medium as the input to the first pressure regulator 3 and the second pressure regulator 7. Specifically, the high-pressure gas source is typically an industrial gas cylinder, a screw compressor, or other high-pressure gas supply equipment. The pressure reducing valve reduces the pressure of the gas output from the high-pressure gas source to provide a suitable input gas source pressure to the first pressure regulator 3 and the second pressure regulator 7. The square wave pressure calibration device has a gas source port 1, and the gas source assembly is connected to the upper limit pressure line 14 and the lower limit pressure line 15 through the gas source port 1.

[0025] It is understood that in this embodiment, the first pressure regulating component 3 is a pressure boosting control, which adjusts the pressure in the upper limit pressure pipeline 14 upward to the square wave upper limit pressure. Correspondingly, the second pressure regulating component 7 is a pressure depressurizing control, which adjusts the pressure in the lower limit pressure pipeline 15 downward to the square wave lower limit pressure.

[0026] In this embodiment, the signal generating element 11 controls the opening and closing of the two-position three-way valve 5, the action time and the action frequency through PWM control, so as to generate square wave pulse pressure.

[0027] like Figure 1 As shown, the output component also includes an output line 17. One end of the output line 17 is connected to a two-position three-way valve 5, and the other end has a test port 13. Specifically, the two-position three-way valve 5 has three ports: a, b, and c. The downstream ends of the upper limit pressure line 14 and the lower limit pressure line 15 are connected to ports a and c, respectively, while the output line 17 is connected to port b. In other words, the upper limit pressure line 14 and the lower limit pressure line 15 are selectively connected to the output line 17 through the two-position three-way valve 5, thereby enabling the alternating output of square wave upper and lower limit pressures.

[0028] like Figure 1As shown, the square wave pressure calibration device also includes a first pressure sensor 2, which is located downstream of the gas source assembly and is used to detect the output pressure of the gas source assembly. Specifically, the first pressure sensor 2 is located at the parallel connection point of the upper limit pressure line 14 and the lower limit pressure line 15 upstream, or between the gas source port 1 and the upstream parallel connection point. By setting the first pressure sensor 2, the gas source pressure can be monitored in real time to ensure that the gas source pressure is higher than the upper limit pressure of the square wave, thereby achieving a stable high-pressure square wave pulse pressure.

[0029] like Figure 1 As shown, the square wave pressure calibration device also includes a first gas container 4, which is disposed between the first pressure regulating component 3 and the two-position three-way valve 5. Furthermore, the square wave pressure calibration device also includes a second gas container 8, which is disposed between the second pressure regulating component 7 and the two-position three-way valve 5. By setting the gas container, the adjusted upper and lower limit standard gases are stored within, thereby stabilizing the airflow, preventing airflow oscillations, ensuring sufficient gas supply to the upper limit pressure pipeline 14 and the lower limit pressure pipeline 15, and ensuring that the upper and lower limit pressure waveforms of the square wave are stable and oscillating, thus forming an accurate and undistorted square wave pulse pressure.

[0030] like Figure 1 As shown, the square wave pressure calibration device also includes a second pressure sensor 6, which is located downstream of the two-position three-way valve 5 and is used to detect the pressure at the test port 13. In other words, the second pressure sensor 6 is an output pressure sensor.

[0031] like Figure 1 As shown, the square wave pressure calibration device also includes a pressure relief exhaust pipe 16. One end of the pressure relief exhaust pipe 16 is connected to the second pressure regulating element 7, and the other end of the pressure relief exhaust pipe 16 has an exhaust port 12. Specifically, when the signal generating element 11 controls the two-position three-way valve 5 to connect ports a and b and disconnect port c, the upper limit standard gas enters the output pipe 17, thereby outputting the upper limit pressure of the square wave. Then, the signal generating element 11 controls the two-position three-way valve 5 to connect ports b and c and disconnect port a. At this time, since the pressure in the output pipe 17 is the upper limit pressure of the square wave, and the upper limit pressure of the square wave is greater than the lower limit pressure of the square wave, the upper limit standard gas in the output pipe 17 will enter the lower limit pressure pipe 15, and then be depressurized and discharged to the outside atmosphere through the exhaust port 12 via the pressure relief exhaust pipe 16, until the pressure in the lower limit pressure pipe 15 returns to the lower limit pressure of the square wave. It can be understood that a part of the lower limit pressure pipe 15 also belongs to the pressure relief exhaust pipe 16.

[0032] like Figure 1As shown, the square wave pressure calibration device also includes a vacuum pump 10, which is installed on the pressure relief and exhaust pipe 16. By installing the vacuum pump 10, the lower limit pressure pipe 15 and the pressure relief and exhaust pipe 16 can be quickly vented, thereby rapidly reducing the pressure in the lower limit pressure pipe 15 to the lower limit pressure of the square wave, ensuring that the lower limit pressure output waveform of the square wave is stable and oscillating.

[0033] like Figure 1 As shown, the square wave pressure calibration device also includes a third gas container 9, which is installed on the pressure relief exhaust pipe 16 and located upstream of the vacuum pump 10. By setting the third gas container 9, the airflow can be stabilized and airflow oscillation can be prevented. By pumping air through the vacuum pump 10, a negative pressure chamber is formed, which allows the lower limit pressure pipe 15 and the pressure relief exhaust pipe 16 to be discharged quickly. This causes the pressure in the lower limit pressure pipe 15 to drop rapidly to the lower limit pressure of the square wave, ensuring that the lower limit pressure output waveform of the square wave is stable and oscillating.

[0034] In this embodiment, the square wave pressure calibration device also includes a controller, which is electrically connected to the first pressure regulator 3, the second pressure regulator 7, and the signal generating element 11. Furthermore, the controller is also electrically connected to components such as the first pressure sensor 2, the second pressure sensor 6, and the vacuum pump 10, thereby automatically controlling the opening and closing of each component as needed, and realizing automatic control of operations such as pressure increase / decrease, pressure release / exhaust, and square wave formation of the square wave pressure calibration device in this embodiment.

[0035] Specifically, the working process of the square wave pressure calibration device in this embodiment of the invention is as follows:

[0036] A high-pressure gas source is input through gas source inlet 1, and the gas source pressure must be higher than the upper limit pressure of the square wave. The first pressure sensor 2 monitors the gas source pressure in real time and issues an alarm when the pressure falls below the upper limit pressure of the square wave, increasing the gas source input. The first pressure regulator 3 adjusts the pressure in real time according to the set upper limit pressure of the square wave, outputting the upper limit pressure of the square wave, and the gas is stored in the first gas container 4. The second pressure regulator 7 adjusts the pressure in real time according to the set lower limit pressure of the square wave, outputting the lower limit pressure of the square wave, and the gas is stored in the second gas container 8. According to the preset square wave signal pattern, the signal generating element 11 generates a PWM control signal to control the opening and closing of the two-position three-way valve 5 to generate square wave pulsating pressure. The signal generating element 11 first controls the connection of ports a and b of the two-position three-way valve 5 and disconnects port c. The gas in the first gas container 4 of the upper limit pressure pipeline 14 quickly passes through the two-position three-way valve 5 and enters the output pipeline 17, outputting the upper limit pressure of the square wave. The second pressure sensor 6 monitors the output pressure value in real time. Then connect ports c and b of the two-position three-way valve 5 and disconnect port a. The gas in the output pipeline 17 flows towards the second gas container 8 to relieve pressure. The second pressure regulator 7 adjusts the lower limit pressure value in real time. In order to reach the lower limit pressure more quickly and output smoothly, a third gas container 9 and a vacuum pump 10 are set on the pressure relief exhaust pipeline 16. The vacuum pump 10 is always working and pumping out gas. The interior of the third gas container 9 is close to a vacuum state. When the second pressure regulator 7 adjusts the exhaust, due to the pressure difference and the pumping effect, the gas can quickly enter the third gas container 9. In this way, the second gas container 8 and the output pipeline 17 can quickly reach the lower limit pressure and output a square wave lower limit pressure. The second pressure sensor 6 monitors the output pressure value in real time.

[0037] like Figure 2 As shown, embodiments of the present invention also provide a square wave pressure calibration method with adjustable parameters, which uses the above-described square wave pressure calibration device to perform square wave pressure calibration. The square wave pressure calibration method includes:

[0038] Step S1: Adjust the output pressure of the first pressure regulator 3 to the upper limit pressure value of the square wave, so that the gas in the upper limit pressure pipeline 14 is adjusted to the upper limit standard gas, and adjust the output pressure of the second pressure regulator 7 to the lower limit pressure value of the square wave, so that the gas in the lower limit pressure pipeline 15 is adjusted to the lower limit standard gas; Step S2: Control the two-position three-way valve 5 to connect to the upper limit pressure pipeline 14 separately through the signal generating element 11, so that the upper limit standard gas enters the output pipeline 17 and outputs the upper limit pressure of the square wave; Step S3: Control the two-position three-way valve 5 to connect to the lower limit pressure pipeline 15 separately through the signal generating element 11, so that the upper limit standard gas in the output pipeline 17 enters the lower limit pressure pipeline 15 and is discharged through the pressure relief and exhaust pipeline 16 until the lower limit pressure pipeline 15 returns to the lower limit pressure value of the square wave, and the lower limit standard gas enters the output pipeline 17 and outputs the lower limit pressure of the square wave; Step S4: Repeat steps S2 and S3 according to the preset square wave signal, so as to output the square wave pulse pressure and perform square wave pressure calibration on the part to be calibrated.

[0039] Specifically, the gas source is connected and turned on, ensuring that the gas source pressure is higher than the upper limit pressure of the square wave and that the gas supply is sufficient; the target upper and lower limit pressures and duty cycle of the square wave to be output are set; the device starts working, the first pressure regulator 3 adjusts the pressure according to the set upper limit pressure of the square wave, outputs the upper limit pressure of the square wave, and the gas is stored in the first gas container 4; the second pressure regulator 7 adjusts the pressure according to the set lower limit pressure of the square wave, outputs the lower limit pressure of the square wave, and the gas is stored in the second gas container 8. According to the preset square wave signal pattern, the signal generating element 11 generates a PWM control signal to control the opening and closing of the two-position three-way valve 5 to generate square wave pulsating pressure. When ports a and b of the two-position three-way valve 5 are connected and port c is disconnected, the gas in the first gas container 4 of the upper pressure pipeline 14 quickly passes through the two-position three-way valve 5 and enters the output pipeline 17, outputting a square wave upper pressure. The second pressure sensor 6 monitors the output pressure value in real time. Then, ports c and b of the two-position three-way valve 5 are connected again and port a is disconnected. The gas in the output pipeline 17 flows towards the second gas container 8 to relieve pressure. The second pressure regulator 7 adjusts the lower pressure value in real time. At the same time, the vacuum pump 10 on the pressure relief exhaust pipeline 16 is constantly working, evacuating gas outward. The third gas container 9 is close to a vacuum state. When the second pressure regulator 7 adjusts the exhaust, due to the pressure difference and the evacuation effect, the gas can quickly enter the third gas container 9. In this way, the second gas container 8 and the output pipeline 17 can quickly reach the lower pressure limit and output a square wave lower pressure limit. The second pressure sensor 6 monitors the output pressure value in real time. This cycle repeats until the control ends.

[0040] In summary, the above embodiments of the present invention achieve the following technical effects: They can generate accurate and distortion-free square wave pulse pressure; the upper and lower limits of the square wave pulse pressure, as well as parameters such as frequency, can be adjusted according to usage requirements, thereby obtaining the required high-pressure, high-frequency, and regularly amplitude pressure square wave. This allows for the use of a reliable square wave pulsating pressure source in pressure resistance performance, fatigue life testing, and reliability testing of various pressure equipment such as pressure sensors, pressure vessels, and pressure valves. Furthermore, when the square wave pulsating pressure source is used for dynamic pressure calibration, it can not only test the rise time, resonant frequency, and static sensitivity of the pressure sensor, but also measure the amplitude at multiple frequency points of the pressure sensor.

[0041] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A square wave pressure calibration device with adjustable parameters, characterized in that, include: Gas supply assembly, used to provide the gas required for calibration; The first pressure regulator (3) is disposed on the upper limit pressure pipeline (14) and connected to the gas source assembly, and is used to regulate the gas provided by the gas source assembly to the upper limit standard gas. The second pressure regulator (7) is disposed on the lower limit pressure pipeline (15) and connected to the gas source assembly, and is used to adjust the gas provided by the gas source assembly to the lower limit standard gas. The lower limit pressure pipeline (15) is connected in parallel with the upper limit pressure pipeline (14). The square wave generating component includes a two-position three-way valve (5) and a signal generating element (11). The downstream ends of the upper limit pressure line (14) and the lower limit pressure line (15) are respectively connected to the two-position three-way valve (5). The signal generating element (11) is electrically connected to the two-position three-way valve (5) and is used to control the two-position three-way valve (5) to periodically open and close according to a preset square wave signal, so that the upper and lower limit standard gas is alternately output to form a square wave pulsating pressure. The output component includes an output pipe (17) and a test port (13). One end of the output pipe (17) is connected to the two-position three-way valve (5), and the other end is provided with the test port (13). The part to be calibrated is connected to the test port (13). The pressure relief exhaust pipe (16) is connected at one end to the second pressure regulating component (7) and at the other end is provided with an exhaust port (12).

2. The square wave pressure calibration device according to claim 1, characterized in that, The square wave pressure calibration device also includes a first gas container (4), which is disposed between the first pressure regulating element (3) and the two-position three-way valve (5).

3. The square wave pressure calibration device according to claim 2, characterized in that, The square wave pressure calibration device also includes a second gas container (8), which is disposed between the second pressure regulator (7) and the two-position three-way valve (5).

4. The square wave pressure calibration device according to any one of claims 1-3, characterized in that, The square wave pressure calibration device also includes a vacuum pump (10), which is installed on the pressure relief exhaust pipe (16).

5. The square wave pressure calibration device according to claim 4, characterized in that, The square wave pressure calibration device also includes a third gas container (9), which is disposed on the pressure relief exhaust pipe (16) and located upstream of the vacuum pump (10).

6. The square wave pressure calibration device according to any one of claims 1-3, characterized in that, The square wave pressure calibration device also includes a first pressure sensor (2), which is located downstream of the gas source component and is used to detect the output pressure of the gas source component.

7. The square wave pressure calibration device according to any one of claims 1-3, characterized in that, The square wave pressure calibration device also includes a second pressure sensor (6), which is located downstream of the two-position three-way valve (5) and is used to detect the pressure at the test port (13).

8. The square wave pressure calibration device according to any one of claims 1-3, characterized in that, The square wave pressure calibration device also includes a controller, which is electrically connected to the first pressure regulator (3), the second pressure regulator (7) and the signal generating element (11).

9. The square wave pressure calibration device according to any one of claims 1-3, characterized in that, The gas source assembly includes a high-pressure gas source and a pressure reducing valve. The high-pressure gas source provides high-pressure gas as input to the first pressure regulator (3) and the second pressure regulator (7). The pressure reducing valve reduces the pressure of the gas output from the high-pressure gas source.

10. A square wave pressure calibration method with adjustable parameters, characterized in that, Square wave pressure calibration is performed using the square wave pressure calibration device according to any one of claims 1-9, wherein the square wave pressure calibration method comprises: Step S1: Adjust the output pressure of the first pressure regulator (3) to the upper limit pressure value of the square wave so that the gas in the upper limit pressure pipeline (14) is adjusted to the upper limit standard gas. Adjust the output pressure of the second pressure regulator (7) to the lower limit pressure value of the square wave so that the gas in the lower limit pressure pipeline (15) is adjusted to the lower limit standard gas. Step S2: Control the two-position three-way valve (5) to be connected separately to the upper limit pressure pipeline (14) through the signal generating element (11) so that the upper limit standard gas enters the output pipeline (17) and outputs a square wave upper limit pressure; Step S3: Control the two-position three-way valve (5) to be connected to the lower limit pressure pipeline (15) separately through the signal generating element (11), so that the upper limit standard gas in the output pipeline (17) enters the lower limit pressure pipeline (15) and is discharged through the depressurization and exhaust pipeline (16) until the lower limit pressure pipeline (15) is restored to the square wave lower limit pressure value, and the lower limit standard gas enters the output pipeline (17) to output the square wave lower limit pressure; Step S4: Repeat steps S2 and S3 according to the preset square wave signal to output square wave pulse pressure and perform square wave pressure calibration on the part to be calibrated.

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