A liquid flow meter calibration system based on electrical parameter acquisition and analysis

Abstract

The present invention relates to the field of liquid flow meter calibration, and is used to solve the problem that the calibration result of the flow meter is deviated due to the lack of detection of the error cause and the power supply environment during the measurement of the liquid flow meter. The present invention is specifically a liquid flow meter calibration system based on electrical parameter acquisition and analysis. In the present invention, the electrical parameters of the liquid flow meter are acquired, and the stability of the electrical parameters is analyzed to ensure that the stability of the electrical parameters of the liquid flow meter meets the requirements. After the operating stability of the liquid flow meter meets the standards, the flow accuracy result is judged and output, so as to avoid the calibration of the liquid flow meter being disturbed by the electrical parameters and causing errors in the judgment result. The judgment of the stability of the electrical parameters includes the stability of the power supply and the stability of the coil, so as to facilitate the maintenance and calibration of the liquid flow meter by the staff. When the liquid calibration of the liquid flow meter is performed, the mass method, the static volume method and the dynamic volume method are combined to ensure the accuracy of the calibration result.

Description

Technical Field

[0001] The invention relates to the field of liquid flow meter calibration, and in particular to a liquid flow meter calibration system based on electrical parameter acquisition and analysis. Background Art

[0002] A flow meter is an instrument that measures the total amount of fluid within a selected time interval. Simply put, it is an instrument used to measure the flow rate of fluid in a pipeline or open channel. Flow meters are divided into differential pressure flow meters, rotor flow meters, throttling flow meters, slit flow meters, volumetric flow meters, electromagnetic flow meters, ultrasonic flow meters, etc. Classified by medium: liquid flow meters and gas flow meters. In daily use, electromagnetic flow meters are widely used because their measurements are not affected by changes in fluid density, viscosity, temperature, pressure, and conductivity. There are no flow-blocking parts in the measuring tube, no pressure loss, and low straight pipe section requirements. They have unique adaptability to slurry measurements and their product performance can remain stable for a long time. Liquid flow meters are important monitoring instruments in production and life, and their accuracy is the most important point of liquid flow meters. Therefore, liquid flow meters need to be calibrated regularly to ensure the normal operation of liquid flow meters.

[0003] At present, the existing calibration system of liquid flowmeter still has shortcomings. When calibrating, the existing liquid flowmeter generally adopts the volume method or mass method for measurement, that is, by measuring the volume of fluid flowing through the flowmeter within a certain period of time, and comparing it with the actual fluid mass or fluid volume flowing into the container, the accuracy of the flowmeter is calculated. This method can judge the measurement result of the liquid flowmeter during measurement, but lacks analysis of the error cause of the liquid flowmeter, which is not conducive to the calibration of the liquid flowmeter. At the same time, the power supply environment of the liquid flowmeter during calibration lacks detection, which is easy to cause measurement errors in the liquid flowmeter due to power supply parameters, thereby causing the calibration result of the liquid flowmeter to be misjudged;

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] In the present invention, when calibrating the liquid flow meter, the electrical parameters of the liquid flow meter are collected to analyze the stability of the electrical parameters, and whether the operating stability of the liquid flow meter itself meets the requirements is judged based on the stability of the electrical parameters. After the operating stability of the liquid flow meter meets the standards, the flow accuracy result is judged and output, thereby ensuring that the calibration of the liquid flow meter will not cause errors in the judgment results due to interference from the liquid flow meter's own electrical parameters or external electrical parameters, and solving the problem of lack of detection of error causes and power supply environment during liquid flow meter measurement, resulting in deviations in the flow meter calibration results, and proposing a liquid flow meter calibration system based on electrical parameter collection and analysis.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A liquid flow meter calibration system based on electrical parameter acquisition and analysis includes a response acquisition and analysis unit, which can count the response time of the liquid flow meter and determine whether the response time meets the requirements;

[0008] A real-time parameter acquisition unit, wherein the real-time parameter acquisition unit is used to acquire the electromagnetic stability and voltage stability of the liquid flow meter;

[0009] A parameter analysis unit, wherein the parameter analysis unit comprehensively analyzes electromagnetic stability, voltage stability, and response time to determine whether the operating environment of the liquid flow meter is normal, thereby outputting a judgment result of the liquid flow meter;

[0010] A result generating unit, which controls the measurement operation of the liquid flow meter and outputs the measurement result of the liquid flow meter;

[0011] The review and monitoring unit compares and analyzes the liquid input and liquid output during the test of the liquid flow meter to ensure that the test of the liquid flow meter is accurate.

[0012] As a preferred embodiment of the present invention, the result generating unit generates a test calibration signal, and controls the liquid flow meter to work through the test calibration signal. When the liquid flow meter is calibrated, the liquid inlet of the liquid flow meter is connected to the outlet of a liquid pump having a constant speed of outputting liquid through a pipeline, and the outlet of the liquid flow meter is connected to a liquid collecting device, which has the ability to measure the weight and volume of the liquid. The result generating unit simultaneously sends the test calibration signal to the parameter analyzing unit;

[0013] The result generating unit generates a test end signal after the test reaches a preset time. After the test end signal is generated, the measurement result obtained by the liquid flow meter is acquired and the measurement result is sent to the parameter analyzing unit.

[0014] As a preferred embodiment of the present invention, the review and monitoring unit obtains the liquid output volume through a liquid pump and obtains the liquid collection volume through a liquid collection device. The review and monitoring unit calculates the difference between the liquid output volume and the liquid collection volume. If the difference between the liquid output volume and the liquid collection volume is not greater than a preset difference, a measurement valid signal is generated. If the difference between the liquid output volume and the liquid collection volume is greater than the preset difference, a measurement invalid signal is generated. The review and detection unit sends the measurement valid signal or the measurement invalid signal to the result generation unit. After obtaining the measurement valid signal, the result generation unit sends an analysis signal to the parameter analysis unit.

[0015] As a preferred embodiment of the present invention, the review monitoring unit obtains the liquid output volume in the following manner: the review monitoring unit obtains the liquid output speed preset by the liquid pump, and multiplies the liquid output speed by the liquid output time to obtain the liquid output volume;

[0016] The way in which the verification and detection unit obtains the liquid collection amount is as follows: the verification and detection unit obtains the liquid weight by weight weighing, obtains the liquid volume reading by visual acquisition equipment, and at the same time obtains the density and temperature of the test liquid, obtains the theoretical volume by formula calculation, and performs arithmetic averaging of the theoretical volume and the liquid volume reading to obtain the liquid collection amount.

[0017] As a preferred embodiment of the present invention, the response acquisition and analysis unit collects the response time of the liquid flow meter, records the collected response time as the response interval, and compares the response interval with the preset response interval. If the response interval is not greater than the preset interval threshold, a normal response signal is generated; if the response interval is greater than the preset interval threshold, an abnormal response signal is generated. After the response acquisition and analysis unit generates the abnormal response signal, it is sent to the abnormal response reminder, and the abnormal response signal is sent to the parameter analysis unit at the same time.

[0018] As a preferred embodiment of the present invention, the real-time parameter acquisition unit performs real-time electrical parameter acquisition on the liquid flow meter, wherein the collected electrical parameters include voltage stability and electromagnetic stability, and the method for the real-time parameter acquisition unit to obtain voltage stability is: measuring the input voltage of the liquid flow meter to obtain the real-time voltage, and performing formula analysis on the maximum value of the real-time voltage, the minimum value of the real-time voltage, and the arithmetic mean of all real-time voltages to generate voltage stability;

[0019] The method for the real-time parameter acquisition unit to obtain electromagnetic stability is: the voltage and current applied to the excitation coil are collected multiple times, and the resistance values ​​of multiple groups of excitation coils are obtained by calculation according to the results of each collection, and the electromagnetic stability is generated by formula analysis through the resistance value and the arithmetic mean of all resistance values;

[0020] The real-time parameter acquisition unit sends the electromagnetic stability and the voltage stability to the parameter analysis unit, and the response acquisition and analysis unit sends the response time to the parameter analysis unit.

[0021] As a preferred embodiment of the present invention, the parameter analysis unit calculates the ratio of the electromagnetic stability to a preset electromagnetic stability threshold to obtain the electromagnetic stability coverage rate;

[0022] The parameter analysis unit calculates the ratio of the voltage stability to a preset voltage stability threshold to obtain a voltage stability coverage rate;

[0023] The parameter analysis unit performs a ratio analysis on the response time and the response time threshold to obtain a response time ratio;

[0024] The parameter analysis unit comprehensively calculates the electromagnetic stability coverage, voltage stability coverage and response time ratio to obtain a qualified total ratio. The parameter analysis unit compares the qualified total ratio with a preset ratio threshold. If the qualified total ratio is greater than the preset ratio threshold, a qualified operating parameter signal is generated. If the qualified total ratio is less than the preset ratio threshold, an unqualified operating parameter signal is generated.

[0025] As a preferred embodiment of the present invention, the parameter analysis unit obtains the liquid output through the review monitoring unit, and compares the liquid output with the measurement result. If the difference between the liquid output and the measurement result is within the allowable error range, a liquid flow meter qualified signal is generated; if the difference between the liquid output and the measurement result is outside the allowable error range, a liquid flow meter unqualified signal is generated;

[0026] The parameter analysis unit outputs a liquid flow meter qualified signal or a liquid flow meter unqualified signal after obtaining the operating parameter qualified signal and the measurement effective signal;

[0027] After obtaining the measurement invalid signal, the parameter analysis unit directly outputs a measurement failure signal;

[0028] After generating the operating parameter unqualified signal, the parameter analysis unit directly outputs a circuit abnormality signal.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] In the present invention, when calibrating the liquid flow meter, the electrical parameters of the liquid flow meter are collected to analyze the stability of the electrical parameters, and whether the operating stability of the liquid flow meter itself meets the requirements is judged based on the stability of the electrical parameters. After the operating stability of the liquid flow meter meets the requirements, the flow accuracy result is judged and output, thereby ensuring that the calibration of the liquid flow meter will not cause errors in the judgment results due to interference from the liquid flow meter's own electrical parameters or external electrical parameters.

[0031] In the present invention, when judging the stability of the electrical parameters of the liquid flow meter, the stability of the external power supply is judged, and the stability of the working environment of the liquid flow meter is ensured according to the judgment result. By judging the operation stability of the coil itself, it is avoided that the excitation coil part of the liquid flow meter has a short circuit or the like, which causes the magnetic field to change and thus affects the reading of the liquid flow meter. The diversity of the judgment of the calibration result of the electromagnetic flow meter is improved, and it is convenient for the staff to maintain and calibrate the liquid flow meter.

[0032] In the present invention, when the liquid flow meter is calibrated, the mass method and the static volume method are combined to ensure that the reading of the collected liquid volume is accurate, providing reliable data support for the calibration of the liquid flow meter. The static volume method and the dynamic volume method are combined to ensure the sealing of the liquid flow meter calibration system itself and the accuracy of the calibration result. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0034] Figure 1 is a system block diagram of the present invention;

[0035] Figure 2 It is a system flow chart of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0037] See also Figure 1 - Figure 2 As shown, a liquid flow meter calibration system based on electrical parameter acquisition and analysis includes a response acquisition and analysis unit, a real-time parameter acquisition unit, a parameter analysis unit, a result generation unit and a review monitoring unit. When calibrating the liquid flow meter, the liquid inlet of the liquid flow meter is connected to the outlet of a liquid pump that outputs liquid at a constant speed through a pipeline, and a liquid collection device is connected to the outlet of the liquid flow meter. The liquid collection device has the ability to measure the weight and volume of the liquid. The result generation unit can generate a test calibration signal by manual input, and control the liquid flow meter to work through the test calibration signal, and control the liquid pump to output the liquid at the same time. The result generation unit sends the test calibration signal to the parameter analysis unit at the same time;

[0038] After the test reaches the preset time, the result generation unit generates a test end signal and controls the liquid pump to stop working through the test end signal. After generating the test end signal, the result generation unit obtains the measurement results obtained by the liquid flow meter and sends the measurement results to the parameter analysis unit.

[0039] The review monitoring unit obtains the liquid output volume through the liquid pump and obtains the liquid collection volume through the liquid collection device;

[0040] The way in which the review monitoring unit obtains the liquid output volume is as follows: the review monitoring unit obtains the liquid output speed preset by the liquid pump, and multiplies the liquid output speed by the liquid output time to obtain the liquid output volume;

[0041] The way in which the review and detection unit obtains the liquid collection amount is as follows: the review and detection unit obtains the liquid weight M by weight weighing, obtains the liquid volume reading V0 by visual acquisition equipment, and at the same time, the review and detection unit obtains the density ρ and temperature T of the test liquid, and obtains the theoretical volume V1 by formula calculation, where q is a preset coefficient, and the value of q is related to the temperature expansion coefficient of the liquid. The theoretical volume V1 and the liquid volume reading V0 are arithmetic averaged to obtain the liquid collection amount.

[0042] The review and monitoring unit calculates the difference between the liquid output and the liquid collection volume. If the difference between the liquid output and the liquid collection volume is not greater than the preset difference, a measurement valid signal is generated. If the difference between the liquid output and the liquid collection volume is greater than the preset difference, it indicates that during the measurement process of the liquid flow meter, the difference between the liquid input and output results is too large. In order to avoid leakage in the liquid flow meter, liquid pipeline and its connections that affects the calibration results, a measurement invalid signal is generated. The review and detection unit sends the measurement valid signal or the measurement invalid signal to the result generating unit. After obtaining the measurement invalid signal, the result generating unit sends an invalid measurement reminder to the management personnel. After obtaining the measurement valid signal, the result generating unit sends an analysis signal to the parameter analysis unit. Example

[0043] See also Figure 1 - Figure 2 As shown, the response acquisition and analysis unit collects the response time of the liquid flow meter, records the collected response time as the response interval, and compares the response interval with the preset response interval. If the response interval is not greater than the preset interval threshold, a normal response signal is generated. If the response interval is greater than the preset interval threshold, a response abnormality signal is generated. The method for the response acquisition and analysis unit to obtain the response time is:

[0044] The response acquisition and analysis unit starts timing when the liquid pump starts working, and ends timing when the liquid flow meter detects the passage of liquid, and records the interval between the start timing and the end timing as the response time;

[0045] After the response collection and analysis unit generates a response abnormality signal, it sends a corresponding abnormality reminder to the management personnel through the network, and at the same time sends the response abnormality signal to the parameter analysis unit;

[0046] The real-time parameter acquisition unit acquires electrical parameters of the liquid flow meter in real time, wherein the acquired electrical parameters include voltage stability and electromagnetic stability. The method for the real-time parameter acquisition unit to acquire voltage stability is as follows: measuring the input voltage of the liquid flow meter to obtain the real-time voltage Vi, i=1, 2, 3…, n, and generating voltage stability VW through formula analysis, wherein Vmax is the maximum value of the real-time voltage, Vmin is the minimum value of the real-time voltage, and V0 is the arithmetic mean of all real-time voltages;

[0047] The method for the real-time parameter acquisition unit to obtain electromagnetic stability is: collect the voltage and current applied to the excitation coil multiple times, calculate according to the results of each collection, obtain the resistance values ​​of multiple groups of excitation coils, record the resistance values ​​as Ωi, and generate electromagnetic stability CW through formula analysis, where Ω0 is the arithmetic mean of all resistance values ​​Ωi;

[0048] The real-time parameter acquisition unit sends the electromagnetic stability CW and the voltage stability VW to the parameter analysis unit, and the response acquisition and analysis unit sends the response time to the parameter analysis unit;

[0049] The parameter analysis unit calculates the ratio of the electromagnetic stability CW to the preset electromagnetic stability threshold CW0 to obtain the electromagnetic stability coverage rate CP, CP=CW / CW0;

[0050] The parameter analysis unit calculates the ratio of the voltage stability VW to the preset voltage stability threshold VW0 to obtain the voltage stability coverage ratio VP, VP=VW / VW0;

[0051] The parameter analysis unit records the response time as S, and performs a ratio analysis between the response time S and the response time threshold S0 to obtain a response time ratio SP, SP=S / S0;

[0052] The parameter analysis unit performs comprehensive calculation on the electromagnetic stability coverage ratio CP, the voltage stability coverage ratio VP and the response time ratio SP to obtain a qualified total ratio X, and the parameter analysis unit compares the qualified total ratio with a preset ratio threshold. If the qualified total ratio is greater than the preset ratio threshold, a qualified operation parameter signal is generated; if the qualified total ratio is less than the preset ratio threshold, an unqualified operation parameter signal is generated;

[0053] The parameter analysis unit obtains the liquid output through the review monitoring unit, and compares the liquid output with the measurement result. If the difference between the liquid output and the measurement result is within the allowable error range, a liquid flow meter qualified signal is generated; if the difference between the liquid output and the measurement result is outside the allowable error range, a liquid flow meter unqualified signal is generated;

[0054] After obtaining the qualified signal of the operating parameters and the effective signal of the measurement, the parameter analysis unit outputs the qualified signal of the liquid flow meter or the unqualified signal of the liquid flow meter to complete the measurement of the liquid flow meter;

[0055] After obtaining the measurement invalid signal, the parameter analysis unit directly outputs the measurement failure signal, and does not output the liquid flow meter qualified signal or liquid flow meter unqualified signal, so as to avoid the interference of the test environment and test equipment failure, error, etc. on the measurement result of the liquid flow meter;

[0056] After generating an operating parameter unqualified signal, the parameter analysis unit directly outputs a circuit abnormality signal, and does not output a liquid flow meter qualified signal or a liquid flow meter unqualified signal, thereby reminding the management personnel that the metering error of the liquid flow meter is caused by the power supply parameters or the short circuit of the excitation coil.

[0057] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A liquid flow meter calibration system based on electrical parameter acquisition and analysis, characterized in that: It includes a response acquisition and analysis unit, which can collect statistics on the response time of the liquid flow meter and determine whether the response time meets the requirements; A real-time parameter acquisition unit, wherein the real-time parameter acquisition unit is used to acquire the electromagnetic stability and voltage stability of the liquid flow meter; A parameter analysis unit, wherein the parameter analysis unit comprehensively analyzes electromagnetic stability, voltage stability, and response time to determine whether the operating environment of the liquid flow meter is normal, thereby outputting a judgment result of the liquid flow meter; A result generating unit, which controls the measurement operation of the liquid flow meter and outputs the measurement result of the liquid flow meter; The review and monitoring unit compares and analyzes the liquid input and liquid output during the test of the liquid flow meter to ensure that the test of the liquid flow meter is accurate.

2. A liquid flow meter calibration system based on electrical parameter acquisition and analysis according to claim 1, characterized in that: The result generating unit generates a test calibration signal, and controls the liquid flow meter to work through the test calibration signal. When the liquid flow meter is calibrated, the liquid inlet of the liquid flow meter is connected to the outlet of a liquid pump that outputs liquid at a constant speed through a pipeline, and the outlet of the liquid flow meter is connected to a liquid collecting device, which has the ability to measure the weight and volume of the liquid. The result generating unit simultaneously sends the test calibration signal to the parameter analyzing unit; The result generating unit generates a test end signal after the test reaches a preset time. After the test end signal is generated, the measurement result obtained by the liquid flow meter is acquired and the measurement result is sent to the parameter analyzing unit.

3. A liquid flow meter calibration system based on electrical parameter acquisition and analysis according to claim 1, characterized in that: The review and monitoring unit obtains the liquid output volume through the liquid pump and obtains the liquid collection volume through the liquid collection device. The review and monitoring unit calculates the difference between the liquid output volume and the liquid collection volume. If the difference between the liquid output volume and the liquid collection volume is not greater than the preset difference, a measurement valid signal is generated. If the difference between the liquid output volume and the liquid collection volume is greater than the preset difference, a measurement invalid signal is generated. The review and detection unit sends the measurement valid signal or the measurement invalid signal to the result generation unit. After obtaining the measurement valid signal, the result generation unit sends an analysis signal to the parameter analysis unit.

4. A liquid flow meter calibration system based on electrical parameter acquisition and analysis according to claim 3, characterized in that: The review monitoring unit obtains the liquid output volume in the following manner: the review monitoring unit obtains the liquid output speed preset by the liquid pump, and multiplies the liquid output speed by the liquid output time to obtain the liquid output volume; The way in which the verification and detection unit obtains the liquid collection amount is as follows: the verification and detection unit obtains the liquid weight by weight weighing, obtains the liquid volume reading by visual acquisition equipment, and at the same time obtains the density and temperature of the test liquid, obtains the theoretical volume by formula calculation, and performs arithmetic averaging of the theoretical volume and the liquid volume reading to obtain the liquid collection amount.

5. The liquid flow meter calibration system based on electrical parameter acquisition and analysis according to claim 1 is characterized in that: The response collection and analysis unit collects the response time of the liquid flow meter, records the collected response time as the response interval, and compares the response interval with the preset response interval. If the response interval is not greater than the preset interval threshold, a normal response signal is generated; if the response interval is greater than the preset interval threshold, an abnormal response signal is generated. After the response collection and analysis unit generates the abnormal response signal, it is sent to the abnormal response reminder, and the abnormal response signal is sent to the parameter analysis unit at the same time.

6. The liquid flow meter calibration system based on electrical parameter acquisition and analysis according to claim 1, characterized in that: The real-time parameter acquisition unit acquires electrical parameters of the liquid flow meter in real time, wherein the acquired electrical parameters include voltage stability and electromagnetic stability. The method for the real-time parameter acquisition unit to acquire voltage stability is: measuring the input voltage of the liquid flow meter to obtain the real-time voltage, and performing formula analysis on the maximum value of the real-time voltage, the minimum value of the real-time voltage, and the arithmetic mean of all the real-time voltages to generate voltage stability; The method for the real-time parameter acquisition unit to obtain electromagnetic stability is: the voltage and current applied to the excitation coil are collected multiple times, and the resistance values ​​of multiple groups of excitation coils are obtained by calculation according to the results of each collection, and the electromagnetic stability is generated by formula analysis through the resistance value and the arithmetic mean of all resistance values; The real-time parameter acquisition unit sends the electromagnetic stability and the voltage stability to the parameter analysis unit, and the response acquisition and analysis unit sends the response time to the parameter analysis unit.

7. The liquid flow meter calibration system based on electrical parameter acquisition and analysis according to claim 1, characterized in that: The parameter analysis unit calculates the ratio of the electromagnetic stability to a preset electromagnetic stability threshold to obtain an electromagnetic stability coverage rate; The parameter analysis unit calculates the ratio of the voltage stability to a preset voltage stability threshold to obtain a voltage stability coverage rate; The parameter analysis unit performs a ratio analysis on the response time and the response time threshold to obtain a response time ratio; The parameter analysis unit comprehensively calculates the electromagnetic stability coverage, voltage stability coverage and response time ratio to obtain a qualified total ratio. The parameter analysis unit compares the qualified total ratio with a preset ratio threshold. If the qualified total ratio is greater than the preset ratio threshold, a qualified operating parameter signal is generated. If the qualified total ratio is less than the preset ratio threshold, an unqualified operating parameter signal is generated.

8. The liquid flow meter calibration system based on electrical parameter acquisition and analysis according to claim 1, characterized in that: The parameter analysis unit obtains the liquid output through the review monitoring unit, and compares the liquid output with the measurement result. If the difference between the liquid output and the measurement result is within the allowable error range, a liquid flow meter qualified signal is generated; if the difference between the liquid output and the measurement result is outside the allowable error range, a liquid flow meter unqualified signal is generated; The parameter analysis unit outputs a liquid flow meter qualified signal or a liquid flow meter unqualified signal after obtaining the operating parameter qualified signal and the measurement effective signal; After obtaining the measurement invalid signal, the parameter analysis unit directly outputs a measurement failure signal; After generating the operating parameter unqualified signal, the parameter analysis unit directly outputs a circuit abnormality signal.

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