Special performance detection testboard for thermocouple sensor and test method thereof
By using an integrated thermocouple sensor testing platform with automated control and dual stability judgment logic, the problems of complex processes, long time consumption and low accuracy in traditional testing are solved, and efficient and safe thermocouple sensor testing is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WUXI VALEO AUTOMOTIVE COMPONENTS & SYST CO LTD
- Filing Date
- 2026-01-22
- Publication Date
- 2026-04-21
AI Technical Summary
Existing thermocouple sensor testing suffers from problems such as complex workflow, long processing time, low accuracy, and difficulty in ensuring consistency, mainly due to reliance on manual operation and experience-based judgment.
An integrated thermocouple sensor performance testing bench was designed, which adopts a main control terminal, a temperature control heating device, a reference measurement unit and a data acquisition unit to realize automated temperature control, judgment and data acquisition. Combined with dual stability judgment logic and safety interlock mechanism, the accuracy and safety of the test are ensured.
It has achieved a fully automated testing process, reducing manpower consumption, improving testing efficiency and accuracy, ensuring data reliability and security, and avoiding human error and burn accidents.
Smart Images
Figure CN121898643A_ABST
Abstract
Description
Technical Field
[0001] This invention generally relates to the field of sensor performance testing technology. More specifically, this invention relates to a dedicated performance testing bench and testing method for thermocouple sensors. Background Technology
[0002] In the field of thermocouple sensor performance testing, the commonly used technical solution currently relies on independent, separate equipment. The specific configuration typically includes a separate high-temperature furnace (for providing the heat source) and a separate data acquisition device (for reading data).
[0003] Traditional testing processes mainly rely on manual control, and the specific steps are as follows: (1) Manual setting: The tester needs to manually set the target temperature point on the high temperature furnace.
[0004] (2) Manual monitoring: The testers read the temperature readings of the thermocouples on the high-temperature furnace with the naked eye.
[0005] (3) Manual judgment: Based on the temperature value read, the tester judges manually whether the temperature inside the furnace has reached the target value and is in a stable state.
[0006] (4) Manual data collection: After the temperature is confirmed to be within the standard, the tester manually operates the data collection device to collect, record and save the data of the sample.
[0007] However, the aforementioned traditional testing methods have significant technical drawbacks: (1) Complex workflow: There is no linkage between the equipment, and personnel need to frequently operate between different equipment.
[0008] (2) Huge workload: The whole process cannot be unattended and consumes a lot of human resources.
[0009] (3) Too long: Manual judgment and manual operation lead to a longer time for waiting for the temperature to stabilize and for recording data, resulting in low testing efficiency.
[0010] (4) Accuracy and consistency are difficult to guarantee: Since it relies on manual judgment to determine whether the temperature has reached the target value (rather than algorithm-based quantitative judgment), it is easy to introduce human error and it is difficult to accurately capture the true thermal equilibrium point.
[0011] Therefore, how to solve the problems of low accuracy and low efficiency of current thermocouple sensor testing is one of the key research directions. Summary of the Invention
[0012] To address the aforementioned technical problems of low accuracy and low efficiency in current thermocouple sensor testing, this invention proposes a solution. Therefore, this invention provides solutions in the following aspects.
[0013] In a first aspect, the present invention provides a dedicated performance testing bench for thermocouple sensors, comprising: a main control terminal (1) for sending temperature control commands, receiving feedback data and performing logical operations; a temperature-controlled heating device (3) for communicating with the main control terminal and providing a controlled temperature environment to accommodate the thermocouple (8) under test; a reference measurement unit including a reference thermocouple (6) placed in the temperature-controlled heating device and a temperature measuring instrument (5) connected thereto, for measuring the actual temperature inside the temperature-controlled heating device in real time; and a data acquisition unit (2) connected to the temperature measuring instrument (5), the thermocouple (8) under test and the main control terminal (1) respectively; the main control terminal (1) is configured to execute closed-loop control logic: automatically determine whether the ambient temperature has reached a stable state based on the reference thermocouple temperature value fed back by the data acquisition unit, and automatically trigger data acquisition and recording of the thermocouple (8) under test after determining that it is stable.
[0014] In one embodiment, the temperature control heating device (3) adopts a composite thermal environment structure, including: a high-temperature oven as a basic heating source; a specially made temperature equalization block placed inside the high-temperature oven for inserting thermocouples and using its heat equalization characteristics to reduce temperature fluctuations; and a heat preservation component wrapped around the heating area to reduce the influence of the external environment on the temperature inside the oven.
[0015] In one embodiment, the temperature measuring instrument (5) is a digital multimeter, which transmits the temperature value of the reference thermocouple (6) to the data acquisition unit (2) through a communication interface. The reference thermocouple (6) is located in the central temperature measuring area of the temperature control heating device.
[0016] In one embodiment, the test bench further includes a safety interlock mechanism, wherein the main control terminal or temperature control heating device is configured to automatically lock the door of the test bench when the temperature of the temperature control heating device exceeds a preset safety threshold; the preset safety threshold is 150°C.
[0017] In one embodiment, the data acquisition unit (2) and the test bench interface are configured to have at least 12 test channels, which can simultaneously connect to and acquire the output signals of 12 thermocouples under test.
[0018] In one embodiment, a power supply (4) is also included, which is connected to the product connection port (7) through the data acquisition unit (2) to provide working voltage to the thermocouple under test (8) during the test.
[0019] In a second aspect, the present invention also provides a testing method based on the dedicated performance testing bench described in one or more of the foregoing embodiments, comprising the following steps: a main control terminal sends a target temperature setting command to a temperature-controlled heating device to control the heating device to heat up; a reference measurement unit measures the temperature inside the heating device in real time and feeds the temperature data back to the main control terminal through a data acquisition unit; the main control terminal performs stability calculations on the fed-back temperature data to determine whether the temperature has reached a stable state; if and only if the temperature is determined to have reached a stable state, the main control terminal instructs the data acquisition unit to acquire the output signal of the thermocouple under test and record and save it; the main control terminal automatically sets the next target temperature point and repeats the above steps until all preset temperature points are tested.
[0020] In one embodiment, the determination of whether the temperature has reached a stable state is specifically implemented using a dual stability determination logic: Level 1 determination: determine whether the real-time temperature has entered the set error range of the target temperature. If it has, it is determined to be initially stable; Level 2 determination: after determining that it is initially stable, continue to monitor the temperature data. If the temperature fluctuation in the subsequent preset time period meets the thermal equilibrium condition, it is determined to be completely stable; data acquisition is only performed after determining that it has reached complete stability.
[0021] In one embodiment, the thermal equilibrium condition includes a temperature stability value less than a set value, and the formula for calculating the temperature stability index is: .
[0022] In the formula, For temperature stability, The number of sampling points within the sliding time window. For the first in the window Reference temperature values at each sampling point This represents the arithmetic mean of the temperatures within the window. For the rate of temperature change, This is a weighting coefficient used to balance the effects of volatility variance and linear drift.
[0023] In one embodiment, an initialization self-test step is also included: the system automatically checks the connection status of the thermocouple under test, the temperature control heating device, and the data acquisition unit; the heating process is started only after all connection statuses are confirmed to be normal.
[0024] The beneficial effects of this invention are as follows: According to the solution of this invention, a fully automated testing process is achieved through closed-loop integration of the main control terminal with the temperature control equipment and data acquisition equipment. The system can automatically set the target temperature, automatically determine the temperature, and automatically acquire and record data. This not only greatly saves the time waiting for the temperature to stabilize, but also saves a lot of manpower and material resources, achieving unattended operation. At the same time, by determining that data acquisition is performed after reaching a stable state, the detection accuracy is effectively improved.
[0025] Furthermore, a dual-judgment logic is employed. After the temperature reaches the target value (initial stabilization), the system continues to monitor and waits for the temperature to reach true thermal equilibrium (complete stabilization) before collecting data. This data-driven quantitative judgment mechanism effectively eliminates measurement errors introduced by temperature fluctuations, ensuring high reliability of the test data.
[0026] Furthermore, this invention integrates a safety interlock mechanism. When the oven temperature exceeds 150°C, the test bench door automatically locks. This effectively prevents burns caused by operators accidentally opening the oven door during high-temperature testing, meeting industrial safety standards. Attached Figure Description
[0027] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 This is a schematic diagram illustrating the composition of a dedicated performance testing bench for thermocouple sensors according to an embodiment of the present invention; Figure 2 This is a flowchart schematically illustrating a test method for a dedicated performance testing bench according to an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the operation flowchart of the test bench according to an embodiment of the present invention; Figure 4 This is a schematic diagram illustrating the test results of a method in which an embodiment of the present invention is applied; Figure 5 This is a schematic diagram illustrating test result data of a method in which an embodiment of the present invention is applied. Detailed Implementation
[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0029] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0030] Figure 1 This is a schematic diagram illustrating the composition of a dedicated performance testing bench for thermocouple sensors according to an embodiment of the present invention.
[0031] like Figure 1 As shown, the present invention provides a dedicated performance testing platform for thermocouple sensors, including a main control terminal 1, a temperature control heating device 3, a reference measurement unit and a data acquisition unit 2.
[0032] The main control terminal 1 is used to send temperature control commands, receive feedback data, and perform logical operations. In some embodiments, the main control terminal can be a computer, tablet, or other smart device to control the heating device and measure data. As the core control unit, the main control terminal can communicate with other parts via RS232, USB, or TCP / IP protocols.
[0033] The temperature-controlled heating device 3 is communicatively connected to the main control terminal to provide a controlled temperature environment for accommodating the thermocouple 8 under test. In some embodiments, the temperature-controlled heating device 3 may employ a composite thermal environment structure, including a high-temperature oven, a specially designed temperature equalization block, and a heat insulation component. Specifically, the high-temperature oven serves as the basic heat source and is communicatively connected to the main control terminal 1 via an RS232 interface to receive the target temperature setting command issued by the main control terminal. Using the high-temperature oven can provide stable temperature conditions.
[0034] A specially designed temperature-equalizing block is placed inside the high-temperature oven to insert thermocouples, utilizing its heat-equalizing properties to reduce temperature fluctuations. The probes of the reference thermocouple 6 and all the thermocouples under test 8 are inserted into the heat-equalizing holes of this specially designed temperature-equalizing block. The specially designed temperature-equalizing block, with its high heat capacity and good thermal conductivity, effectively suppresses temperature fluctuations caused by airflow inside the oven, significantly improving the uniformity of the temperature field. Using this specially designed temperature-equalizing block can improve the influence of thermocouples on oven temperature uniformity and reduce the impact of temperature fluctuations on thermocouples, while also making the test environment more temperature-uniform.
[0035] Insulation components are wrapped around a specially designed temperature equalization block or heating zone to reduce the impact of the external environment on the furnace temperature. These insulation components can be, for example, made of insulating cotton. Insulating cotton is used to reduce the influence of the external environment on the furnace temperature.
[0036] The reference measurement unit includes a reference thermocouple 6 placed inside the temperature-controlled heating device and a temperature measuring instrument 5 connected thereto, used to measure the actual temperature inside the temperature-controlled heating device in real time. In some embodiments, the temperature measuring instrument 5 can be a digital multimeter, such as a Millik multimeter, which transmits the temperature value of the reference thermocouple 6 to the data acquisition unit 2 via a communication interface. The reference thermocouple 6 is located in the central temperature measuring area of the temperature-controlled heating device.
[0037] The data acquisition unit 2 is connected to the temperature measuring instrument 5, the thermocouple under test 8, and the main control terminal 1, respectively. In some embodiments, the data acquisition unit 2 and the test bench interface are configured to have at least 12 test channels, capable of simultaneously connecting to and acquiring the output signals of 12 thermocouples under test (DUTs). Compared to single-item testing, these multiple test channels greatly improve the efficiency of batch product verification and shipment inspection.
[0038] The main control terminal 1 is configured to execute closed-loop control logic: based on the reference thermocouple temperature value fed back by the data acquisition unit, it automatically determines whether the ambient temperature has reached a stable state, and after determining that it is stable, it automatically triggers the data acquisition and recording of the thermocouple 8 under test.
[0039] The aforementioned test bench also includes a power supply 4. This power supply 4 is connected to the product connection port 7 via the data acquisition unit 2 and is used to provide operating voltage to the thermocouple 8 under test during the test.
[0040] Furthermore, the aforementioned test bench also includes a safety interlock mechanism. The main control terminal or temperature-controlled heating device is configured to automatically lock the test bench door when the temperature of the temperature-controlled heating device exceeds a preset safety threshold. This preset safety threshold can be 150℃. This effectively prevents burns caused by operators accidentally opening the furnace door during high-temperature testing.
[0041] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "linked" should be interpreted broadly. For example, the term "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0042] Figure 2 This is a flowchart illustrating, schematically, a test method for a dedicated performance testing bench according to an embodiment of the present invention.
[0043] like Figure 2As shown, in step S201, the main control terminal sends a target temperature setting command to the temperature-controlled heating device to control the heating device to heat up. In some embodiments, an initialization self-test step is included before sending the target temperature setting command. Specifically, the system automatically checks the connection status of the thermocouple under test, the temperature-controlled heating device, and the data acquisition unit; the heating process is started only after confirming that all connection statuses are normal. In one application scenario, before the test begins, the thermocouple under test 8 is connected to the product connection port 7. After the system starts, the main control terminal 1 first executes a self-test program to check the connection status of the high-temperature oven, the precision temperature measuring instrument 5, the data acquisition unit 2, and the thermocouple under test 8. If the connection is abnormal, the system reports an error; if the connection is normal, the automatic test process begins.
[0044] The main control terminal 1 reads the first target temperature point (e.g., Set_T=100℃) according to the preset test plan, and sends the set temperature command to the high-temperature oven through the communication interface. The high-temperature oven starts heating after receiving the command.
[0045] In step S202, the reference measurement unit measures the temperature inside the heating device in real time and feeds the temperature data back to the main control terminal through the data acquisition unit.
[0046] In step S203, the main control terminal performs stability calculations on the feedback temperature data to determine whether the temperature has reached a stable state. In some embodiments, the determination of whether the temperature has reached a stable state specifically employs a dual stability determination logic: Level 1 Detection: Determines whether the real-time temperature has entered the set error range of the target temperature. If it has, it is considered to be initially stable. For example, the real-time temperature can be calculated. With target temperature The absolute value of the deviation. When the absolute value of the deviation is less than the first threshold for a continuous period of time. At that time, it was determined to be initially stable.
[0047] Secondary determination: After initial stabilization is determined, temperature data continues to be monitored. If the temperature fluctuations within a subsequent preset time period meet the thermal equilibrium condition, it is determined to be completely stable. Data acquisition is only performed after complete stabilization is determined. This preset time period can be, for example, 3 minutes, and can be set by those skilled in the art according to actual needs.
[0048] The thermal equilibrium condition includes a temperature stability value less than a set value. This set value is a preset, small threshold, typically close to 0. The formula for calculating the temperature stability index is: .
[0049] In the formula, For temperature stability, The number of sampling points within the sliding time window. For the first in the window Reference temperature values at each sampling point This represents the arithmetic mean of the temperatures within the window. For the rate of temperature change, This is a weighting coefficient used to balance the effects of volatility variance and linear drift.
[0050] In the above calculation formula, the smaller the dispersion of temperature data around the mean (first term), and the closer the linear drift of temperature over time (second term) is to zero, the better the calculated result. The smaller the value, the better. With the second threshold Compare. If If the duration reaches a preset time, the system is determined to have reached a completely stable state. Preferably, the preset value... The value range can be 0.01. 0.05.
[0051] In step S204, only after the temperature is determined to have reached a stable state, the main control terminal instructs the data acquisition unit to acquire and record the output signal of the thermocouple under test. The main control terminal 1 immediately triggers the data acquisition command. The data acquisition unit 2 scans all channels, synchronously records the temperature value of the reference thermocouple 6 and the output signals of all thermocouples under test 8, and saves the data to the database or generates a test report.
[0052] In step S205, the main control terminal automatically sets the next target temperature point and repeats steps S202 to S204 until all preset temperature points have been tested. After the current temperature point is collected, the main control terminal 1 automatically determines whether there are any untested temperature points. If so, it automatically sets the target temperature of the high-temperature oven to the next temperature point (e.g., Set_T=200℃) and repeats steps S202 to S204; if all temperature points have been tested, the test ends and the operator is notified.
[0053] The present invention will now be described in detail with reference to specific embodiments. Figure 3 This is a schematic diagram illustrating the operation flowchart of the test bench according to an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating the test results of a method in which an embodiment of the present invention is applied. Figure 5 This is a schematic diagram illustrating test result data of a method in which an embodiment of the present invention is applied.
[0054] like Figure 3As shown, first check whether all the tested components (thermocouples under test) and equipment are in normal condition, such as whether the connection status is normal. If not, end the process, recheck the status of each component and connection status, and if normal, start a new temperature set point (target temperature point) measurement.
[0055] Next, the system waits for the reference sensor to stabilize initially, and then determines whether the reference sensor is fully stable based on the aforementioned judgment logic. Once the reference sensor is fully stable, data recording and processing begin. In one application scenario, the computer automatically sets the temperature point of the high-temperature furnace based on the input set temperature, and the furnace heats to the target temperature. A digital multimeter is connected to the reference thermocouple sensor to measure the thermocouple's temperature value. After heating for a certain period, the data acquisition card reads the temperature from the digital multimeter multiple times and inputs it into the computer. The computer calculates and determines whether the temperature has reached initial stability. After initial stabilization, the system continues to wait for complete stabilization. Once fully stable, the data acquisition card automatically acquires the sample's signal output and records and saves it to the computer.
[0056] Finally, after completing the test at one temperature point, the above process is repeated to begin measuring at a new set point. After data collection, the computer sets the next temperature point for the high-temperature furnace, repeating the heating and data collection process until all temperature points have been tested.
[0057] like Figure 4 and Figure 5 As shown, the temperature was measured at multiple time points using the above method, and the data was recorded and plotted as a line graph. Figure 4 As can be seen, the heating furnace heats up relatively quickly, reaching the set temperature rapidly. The temperature within the isothermal block gradually reaches the furnace temperature over time. The software interface records the reference thermocouple temperature (Ref TEMP), the furnace temperature (Oven TEMP), and the product's real-time detected temperature (Ch1_Fc1, Ch1_Fc2, Ch2_Fc1, Ch2_Fc2) in real time. If there is a significant temperature difference between the reference thermocouple and the target temperature, the control system will adjust the furnace temperature after a specified waiting time until the reference thermocouple temperature meets the target requirement, before resuming product temperature detection. Figure 5 As you can see, after the product test is completed, the system will automatically determine the results to confirm whether the product's test results meet the accuracy requirements. Meas_T is the actual measured temperature of the product, Ref_T is the temperature of the reference thermocouple for comparison, Err_T is the temperature difference between the product and the reference thermocouple, Tol- is the lower limit error value for judgment, Tol+ is the upper limit error value for judgment, and the Result column displays the judgment results.
[0058] By employing the test bench and testing method described in the above embodiments, the present invention achieves the advantages of full-process automation and high data accuracy. It eliminates the need for manual adjustment of oven knobs and manual monitoring of thermometer readings, enabling one-button start-up and unattended operation, thus solving the pain points of complex processes and long processing times in the prior art. Through the dual protection of physical homogenization by a specially designed temperature-equalizing block and dual stability algorithm determination, the arbitrariness of manual judgment is eliminated, ensuring that every data acquisition occurs when the system is in true thermal equilibrium, greatly improving the confidence level of the test data.
[0059] While this specification has shown and described numerous embodiments of the invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of this invention.
Claims
1. A dedicated performance testing bench for thermocouple sensors, characterized in that, include: The main control terminal (1) is used to send temperature control commands, receive feedback data, and perform logical operations; Temperature control heating device (3) is connected to the main control terminal to provide a controlled temperature environment to accommodate the thermocouple under test (8). The reference measurement unit includes a reference thermocouple (6) placed inside the temperature control heating device and a temperature measuring instrument (5) connected thereto, used to measure the actual temperature inside the temperature control heating device in real time; The data acquisition unit (2) is connected to the temperature measuring instrument (5), the thermocouple to be tested (8), and the main control terminal (1), respectively; The main control terminal (1) is configured to execute closed-loop control logic: based on the reference thermocouple temperature value fed back by the data acquisition unit, it automatically determines whether the ambient temperature has reached a stable state, and after determining that it is stable, it automatically triggers the data acquisition and recording of the thermocouple under test (8).
2. The dedicated performance testing bench for thermocouple sensors according to claim 1, characterized in that, The temperature-controlled heating device (3) adopts a composite thermal environment structure, including: High-temperature ovens serve as the primary heat source; A specially designed temperature equalization block is placed inside the high-temperature oven to insert thermocouples and utilize its temperature equalization characteristics to reduce temperature fluctuations. The insulation component, which wraps around the heating area, is used to reduce the impact of the external environment on the furnace temperature.
3. The dedicated performance testing bench for thermocouple sensors according to claim 1, characterized in that, The temperature measuring instrument (5) is a digital multimeter, which transmits the temperature value of the reference thermocouple (6) to the data acquisition unit (2) through the communication interface. The reference thermocouple (6) is located in the central temperature measuring area of the temperature control heating device.
4. The dedicated performance testing bench for thermocouple sensors according to claim 1, characterized in that, The test bench also includes a safety interlock mechanism. The main control terminal or temperature control heating device is configured to automatically lock the door of the test bench when the temperature of the temperature control heating device exceeds a preset safety threshold. The preset safety threshold is 150°C.
5. The dedicated performance testing bench for thermocouple sensors according to claim 1, characterized in that, The data acquisition unit (2) and the test bench interface are configured to have at least 12 test channels, which can simultaneously connect to and acquire the output signals of 12 thermocouples under test.
6. The dedicated performance testing bench for thermocouple sensors according to claim 1, characterized in that, It also includes a power supply (4), which is connected to the product connection port (7) through the data acquisition unit (2) to provide working voltage to the thermocouple under test (8) during the test.
7. A testing method based on the dedicated performance testing bench according to any one of claims 1 to 6, characterized in that, Includes the following steps: The main control terminal sends a target temperature setting command to the temperature-controlled heating device to control the heating device to raise the temperature; The reference measurement unit measures the temperature inside the heating device in real time and feeds the temperature data back to the main control terminal through the data acquisition unit; The main control terminal performs stability calculations on the feedback temperature data to determine whether the temperature has reached a stable state. The main control terminal instructs the data acquisition unit to acquire and record the output signal of the thermocouple under test only when the temperature is determined to have reached a stable state. The main control terminal automatically sets the next target temperature point and repeats the above steps until all preset temperature points have been tested.
8. The test method according to claim 7, characterized in that, The determination of whether the temperature has reached a stable state employs a dual stability assessment logic: Level 1 judgment: Determine whether the real-time temperature has entered the set error range of the target temperature. If it has, it is judged as initially stable. Secondary judgment: After initial stabilization is determined, temperature data continues to be monitored. If the temperature fluctuations within the subsequent preset time period meet the thermal equilibrium condition, it is judged to be completely stable. Data collection is performed only after the system is determined to be fully stable.
9. The test method according to claim 8, characterized in that, The thermal equilibrium condition includes a temperature stability value less than a set value, and the formula for calculating the temperature stability index is as follows: 。 In the formula, For temperature stability, The number of sampling points within the sliding time window. For the first in the window Reference temperature values at each sampling point This represents the arithmetic mean of the temperatures within the window. For the rate of temperature change, This is a weighting coefficient used to balance the effects of volatility variance and linear drift.
10. The test method according to claim 7, characterized in that, It also includes an initial self-test step: The system automatically checks the connection status of the thermocouple under test, the temperature control heating device, and the data acquisition unit; The heating process should only be started after confirming that all connections are in good working order.