CN111308256A - Error analysis test system and method for degaussing system - Google Patents
Error analysis test system and method for degaussing system Download PDFInfo
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Abstract
The invention relates to a degaussing system error analysis test system and test method, the error test system has increased the electric current calibration port, before testing the error of the degaussing system, measure the error of the error test system oneself through the calibration port, after measuring the error of the whole system, get the error of the degaussing system after removing the error of the error test system oneself, has dispelled the zero offset error of the whole system effectively, has increased the signal filtering algorithm on the signal processing of the withdrawal current at the same time, dispel the noise interference of the withdrawal current, has improved the test accuracy of the degaussing system; meanwhile, the working time delay of the demagnetization system can be measured; the improved current acquisition unit can simultaneously meet the degaussing systems with different output current specifications, and when the same error test system is used for carrying out error measurement on the degaussing systems with different specifications, the degaussing system can work without changing hardware setting. The invention improves the error measurement precision of the whole system and reduces the system time delay.
Description
Technical Field
The invention relates to a detection technology, in particular to a demagnetization system error analysis test system and a demagnetization system error analysis test method.
Background
When a ship sails on the sea for a long time, due to the magnetization of the geomagnetic field, the ship can carry a certain amount of magnetic field, and the ship with the magnetic field can have adverse effects on the working precision of the gyroscope, so that the sailing safety of the ship is affected, and therefore, a demagnetization system is required to be installed on the ship to counteract and eliminate the magnetic field of the ship. The precision control precision of the demagnetization system determines whether the magnetic field of the ship can be eliminated, and the precision of the demagnetization system depends on the precision and the control method of the demagnetization system error analysis test system. The control error of the ship demagnetization system is corrected regularly through the demagnetization system error analysis test system, and the performance of the ship demagnetization system is ensured.
Disclosure of Invention
The invention provides a demagnetization system error analysis test system and a demagnetization system error analysis test method aiming at the problem of obtaining accurate demagnetization system errors.
The technical scheme of the invention is as follows: a degaussing system error analysis test system comprises a signal conditioning unit, a controller unit, a current acquisition unit, a direct current power supply module and a current acquisition box signal conversion module; the current acquisition unit comprises a sensor driving module and a current sensor;
the controller unit sends a current control signal through the first signal conditioning unit, the current control signal is input into the controller unit again through the second signal conditioning unit, and the controller unit acquires a real-time current control signal through extraction; the current control signal is output through the current calibration port and connected with a current sensor of the current acquisition unit, the output signal of the current sensor is transmitted to the signal conversion module of the current acquisition box through the sensor driving module, the signal conversion module of the current acquisition box outputs a recovery current signal which is transmitted to the controller unit through the third signal conditioning unit, and the current control signal and the recovery current signal form a calibration error of the test system;
the current control signal is connected with the current input end of the device to be tested through the current signal port, the current output end of the device to be tested is connected with the current sensor of the current acquisition unit, the output signal of the current sensor is transmitted to the signal conversion module of the current acquisition box through the sensor driving module, the signal conversion module of the current acquisition box outputs a recovery current signal which is transmitted to the controller unit through the third signal conditioning unit, the demagnetization controller transmits the magnetic signal of the device to be tested to the controller unit through the Ethernet, and the current control signal and the recovery current signal form the whole demagnetization system test system error;
the direct current power supply module converts alternating current 220V into working voltage of the sensor driving module to supply power to the sensor driving module, and the sensor driving module drives signals for the current sensor; the alternating current 220V supplies power to the controller unit through the power adapter.
The controller unit sends out current control signals including constant control signals, step control signals and sine control signals.
The current acquisition box signal conversion module is a filter for removing noise interference band signal filtering algorithm.
The method for testing the error analysis test system of the demagnetization system comprises the following steps:
the first step is as follows: error analysis and testing system error calibration:
1) the controller unit outputs various current control signals from the DA0 through the first signal conditioning unit, the current control signals are recovered to the controller unit from the AD0 through the second signal conditioning unit to obtain real-time current control signals, and the signals are output through a control DA0 port;
2) the current control signal is transmitted to a current sensor of the current acquisition unit through a current calibration port, a sensor driving module transmits a recovery current signal acquired by the current sensor to a current acquisition box signal conversion module, a direct-current power supply module converts alternating current 220V into working voltage of the sensor driving module to supply power to the sensor driving module, and the sensor driving module supplies a current sensor driving signal;
3) the method comprises the following steps that a back-mining current signal is subjected to noise interference in the current signal in a signal conversion module of a current acquisition box through a signal filtering algorithm of a filter, the back-mining current signal is transmitted to a controller unit AD1 through a third signal conditioning unit, the controller unit compares a back-mining current control signal in AD0 with a back-mining current signal in AD1 to obtain the self error and the working time delay of an error analysis test system, and the controller unit respectively sends a constant value control signal, a step control signal and a sine control signal to sequentially obtain the normal state error, the transient state error, the static state error and the dynamic state error of the error analysis test system;
the second step is that: and (3) error analysis and test of a demagnetization system:
4) the controller unit outputs a current control signal from the DA0 through the first signal conditioning unit, the current control signal is recovered to the controller unit from the AD0 through the second signal conditioning unit to obtain a real-time current control signal, the current control signal is respectively given out a constant value control signal for measuring the normal state error of the tested equipment according to the test requirement and the process, a step control signal is given out for measuring the transient error of the tested equipment, a step control signal is given out for measuring the static error of the tested equipment, and a sine control signal is given out for measuring the dynamic error of the tested equipment;
5) respectively transmitting different types of current control signals to a current input end of a demagnetization system through a current signal port according to test requirements, converting the current control signals into magnetic signals by a magnetic signal conversion module in the demagnetization system, and receiving the magnetic signals by a magnetometer module;
6) the magnetometer module transmits the received magnetic signal to the demagnetization controller, the demagnetization controller transmits the value to the controller unit through the Ethernet, and the controller unit receives the value of the magnetic signal and calculates the value to obtain a current control value required by the demagnetization system;
7) the demagnetization controller transmits a current control value required by the demagnetization system to a demagnetization system power supply through a CAN bus, the demagnetization system power supply distributes a current value, the CAN bus is connected with a CAN port of an error tester, the error tester CAN monitor the output of the demagnetization controller through CAN bus data, and the output of the demagnetization controller CAN be simulated to test the demagnetization system power supply;
8) the current sensor receives a current value distributed by a power supply of a demagnetization system, the number of core penetrating turns of a current lead of the current acquisition unit is configured through demagnetization test software, a proportionality coefficient of the current acquisition unit is calculated according to a current sensor coefficient and the number of core penetrating turns of the current lead, and the current acquisition unit receives the configured number of core penetrating turns of the current lead and automatically changes a core penetrating loop so as to meet the configured number of core penetrating turns; converting the input demagnetizing system power supply current into a fixed value stoping current signal value, transmitting the fixed value stoping current signal value to a current acquisition box signal conversion module through a sensor driving module, acquiring a stoping current signal by test software, and multiplying the stoping current signal by a proportionality coefficient of a current acquisition unit to obtain an actual current value;
9) the stoping current signal value is subjected to a signal filtering algorithm of a filter in a signal conversion module of the current acquisition box, noise interference in the current is removed, and the stoping current value is input into the AD1 through a signal conditioning unit;
10) the total error and time delay of the whole demagnetization system and the error analysis test system are obtained by comparing the current control signal acquired by the AD0 with the constant value acquired current signal value in the AD1, wherein the error comprises a normal error, a transient error, a static error and a dynamic error;
the third step: and (3) error judgment:
removing the total error and the time delay obtained in the second step from the error value and the time delay of the error analysis test system obtained in the first step to obtain the error value and the time delay of the tested equipment, and when the error value and the time delay do not exceed the error range, judging that the hardware equipment to be tested of the demagnetization system is tested to be qualified under the error condition; and when the calculated error and the calculated time delay exceed the error range, judging that the hardware equipment to be tested of the demagnetization system is unqualified in the test under the error condition.
The invention has the beneficial effects that: the error analysis test system and the test method of the demagnetization system have high precision, the error test system is additionally provided with the current calibration port, the error of the error test system is measured through the calibration port before the error test of the demagnetization system, after the error of the whole system is measured, the error of the demagnetization system is obtained after the error of the error test system is removed, the zero offset error of the whole system is effectively eliminated, meanwhile, the signal filtering algorithm is added on the signal processing of the recovery current, the noise interference of the recovery current is eliminated, and the test precision of the demagnetization system is improved; the real-time performance is strong: the self error of the error test system is measured and the self working time delay is measured at the same time by adding a current calibration port, and the self time delay is removed after the working error and the time delay of the whole system are measured, so that the working time delay of the demagnetization system is obtained; the commonality is good, and the degaussing system of different output current specifications can be satisfied simultaneously to modified current acquisition unit, when using same kind of error test system to carry out the error measurement to different specification degaussing systems, need not change the hardware setting and can work.
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FIG. 1 is a schematic diagram of an error analysis test system of the demagnetization system of the present invention.
Detailed Description
The precision of the ship demagnetizing system is partially determined by the accuracy of the demagnetizing algorithm, and partially determined by the error of the hardware equipment of the demagnetizing system, the accuracy of the demagnetizing algorithm can be improved by program modification, the hardware error of the demagnetizing system can be measured by the demagnetizing error analysis system and method, and after the errors are obtained, the error can be made up by the error analysis algorithm, so that the precision of the demagnetizing system is improved, and the navigation safety of the ship is further ensured.
The error analysis and test system for the demagnetization system mainly comprises a signal conditioning unit, a controller unit, a current acquisition unit, a direct-current power supply module and a current acquisition box signal conversion module. The current acquisition unit comprises a sensor driving module and a current sensor. The controller unit sends a current control signal through the first signal conditioning unit, the current control signal is input into the controller unit again through the second signal conditioning unit, and the controller unit acquires a real-time current control signal through extraction; the current control signal is connected with the current input end of the equipment to be tested through the current signal port and is also connected with the current sensor of the current acquisition unit through the output of the current calibration port; the current output end of the device to be tested is also connected with a current sensor of the current acquisition unit, the sensor driving module is respectively connected with the current acquisition box signal conversion module, the current sensor and the direct current power supply module, the output signal of the current sensor is transmitted to the current acquisition box signal conversion module through the sensor driving module, the current acquisition box signal conversion module transmits the back-mining current signal to the controller unit through the third signal conditioning unit, and the direct current power supply module converts alternating current 220V into working voltage of the sensor driving module to supply power to the sensor driving module; the alternating current 220V supplies power to the controller unit through the power adapter, the demagnetization controller transmits a magnetic signal of the device to be tested to the controller unit through the Ethernet, and fig. 1 is a schematic structural diagram of the demagnetization error analysis system during testing.
The test system has two working modes, one is a calibration mode, and the other is a test mode. In the calibration mode, in order to calibrate the self error of the test system, a calibration cable is connected with the current calibration port and the current acquisition unit, the calibration current outputs a standard current signal through the current calibration port, and the self error of the test system is obtained through a calibration program. In the test mode, the test cable is used for connecting the current signal port with the tested equipment, meanwhile, the calibration cable is removed, the error of the tested equipment is obtained through the test program, and the error of the tested equipment is only the error of the real tested equipment when the error of the tested equipment is calculated by deducting the self error of the test equipment.
The method for analyzing and testing the error of the demagnetization system, which is realized by the demagnetization system error analysis and test system, comprises the steps of calibrating and testing the error of the demagnetization system and analyzing and testing the error of the demagnetization system:
the error calibration testing steps of the error analysis testing system are as follows:
step 1: the controller unit outputs a current control signal from the DA0 through the first signal conditioning unit, the current control signal is recovered to the controller unit from the AD0 through the second signal conditioning unit to obtain a real-time current control signal, and the current control signal unit can output various current signals including a constant control signal, a step control signal and a sine control signal by controlling the output signal of the DA0 port;
step 2: the current control signal is transmitted to a current sensor of the current acquisition unit through a current calibration port, a sensor driving module transmits a recovery current signal acquired by the current sensor to a current acquisition box signal conversion module, a direct-current power supply module converts alternating current 220V into working voltage of the sensor driving module to supply power to the sensor driving module, and the sensor driving module supplies a current sensor driving signal;
and step 3: the noise interference in the current signal is removed by the extraction current signal in the signal conversion module of the current acquisition box through a signal filtering algorithm of a filter, the extraction current signal is transmitted to a controller unit AD1 through a third signal conditioning unit, the controller unit compares the extraction current control signal in AD0 with the extraction current signal in AD1 to obtain the error and the working time delay of the error analysis test system, the error comprises a normal error, a transient error, a static error and a dynamic error, and the zero offset error of the error analysis test system can be measured through the measurement method. The normal state error, i.e., the zero offset error, is a fixed error of the signals AD1 and AD0 when the given signal output is 0. The transient error is the error between the extraction signals AD1 and AD0 when the given signal is a step signal. The static error is a step wave which changes from 0 to full value and is output at a given signal, and after the recovery signal is stable, the AD1 and AD0 are fixed errors. The dynamic error is the error between the signals AD1 and AD0, wherein the signals are sinusoidal signals with fixed frequency. The errors are errors of the test system, and the errors of the tester need to be deducted when the actual equipment is tested, so that the actual errors of the tested equipment are obtained.
The error analysis and test steps of the demagnetization system comprise the following steps:
step 1: the controller unit outputs a current control signal from the DA0 through the first signal conditioning unit, the current control signal is acquired from the AD0 to the controller unit through the second signal conditioning unit to obtain a real-time current control signal, the current control signal is respectively used for determining the normal state error of the tested equipment according to the test requirement and the process, the constant control signal is given out according to the test requirement and the process, the step control signal is used for determining the transient error of the tested equipment, the step control signal is used for determining the static error of the tested equipment, and the sine control signal is used for determining the dynamic error of the tested equipment.
Step 2: respectively transmitting different types of current control signals to a current input end of a demagnetization system through a current signal port according to test requirements, converting the current control signals into magnetic signals by a magnetic signal conversion module in the demagnetization system, and receiving the magnetic signals by a magnetometer module;
and step 3: the magnetometer module transmits the received magnetic signal to the demagnetization controller, the demagnetization controller transmits the value to the controller unit through the Ethernet, and the controller unit receives the value of the magnetic signal and calculates the value to obtain a current control value required by the demagnetization system;
and 4, step 4: the demagnetization controller transmits a current control value required by the demagnetization system to a demagnetization system power supply through a CAN bus, the demagnetization system power supply distributes a current value, the CAN bus is connected with a CAN port of an error tester, the error tester CAN monitor the output of the demagnetization controller through CAN bus data, and the output of the demagnetization controller CAN be simulated to test the demagnetization system power supply;
and 5: the current sensor receives a current value distributed by a power supply of the demagnetization system, the number of the core penetrating turns of a current lead of the current acquisition unit is configured through demagnetization test software, the proportionality coefficient of the current acquisition unit can be calculated according to the current sensor coefficient and the number of the core penetrating turns of the current lead, and the core penetrating loop is automatically changed by the current acquisition unit after the current acquisition unit receives the configured number of the core penetrating turns of the current lead so as to meet the configured requirement of the number of the core penetrating turns. Converting the input demagnetizing system power supply current into a fixed value stoping current signal value, transmitting the fixed value stoping current signal value to a current acquisition box signal conversion module through a sensor driving module, acquiring a stoping current signal by test software, and multiplying the stoping current signal by a proportionality coefficient of a current acquisition unit to obtain an actual current value;
the sensor driving module coil fixes the turn ratio of the input and output current coil, and converts the power supply current of the degaussing systems with different specifications into a standard current recovery signal through different input and output current proportionality coefficients.
Step 6: the stoping current signal value is subjected to a signal filtering algorithm of a filter in a signal conversion module of the current acquisition box, noise interference in the current is removed, and the stoping current value is input into the AD1 through a signal conditioning unit;
and 7: the total error and time delay of the whole demagnetization system and the error analysis test system are obtained by comparing the current control signal acquired by the AD0 with the constant value acquired current signal value in the AD1, wherein the error comprises a normal error, a transient error, a static error and a dynamic error;
and 8: and (4) removing the error value and the time delay obtained in the step (7) from the error value and the time delay obtained in the error calibration test step of the error analysis test system, so as to obtain the error value and the time delay of the tested equipment. When the obtained error value and the time delay do not exceed the error range, the hardware equipment to be tested of the demagnetization system is judged to be qualified in the test under the error condition; and when the calculated error and the calculated time delay exceed the error range, judging that the hardware equipment to be tested of the demagnetization system is unqualified in the test under the error condition.
Because the demagnetization power supply is a current signal obtained by PWM modulation through a power electronic device, the output current of the power supply contains a large amount of noise and interference, if the direct acquisition error is large, reasonable filtering is needed to be carried out, and the noise of the withdrawal current signal is filtered, so that the characteristics of the tested equipment can be accurately obtained. Because the filtering link is added, the delay of the noise current signal is inevitably generated, so that the error and the delay of the whole test system are all calibrated in the calibration link, and the error and the delay of the test system are removed. This is also the reason why the error calibration test step 3 is also filtered. The filtering step is to filter noise in the current signal output by the power supply of the demagnetization system, so as to better calculate the error of the equipment to be tested. In the error calibration testing step 3 and the error analysis testing step 6, the signal filtering algorithm is as follows:
the adaptive filter algorithm criterion is that the minimum mean square error, i.e., the desired value of the square of the difference e (n) between the ideal signal d (n) and the filter output y (n), is minimized and the rootModifying the weight coefficient w according to this criterioni(n)。
Let tap coefficient of N-order FIR filter be wi(n), i represents the number of taps, and the input and output of the filter are x (n) and y (n), respectively, then the filter equation can be expressed as:
wherein, the meaning of n represents the current time, namely the current input is x (n), and the input at the next time is x (n + 1);
d (n) represents the desired response, defining an error signal:
representing the weight coefficients and the inputs W and x (n) in vector form, the error signal e (n) can be written as:
e(n)＝d(n)-WTX(n)＝d(n)-XT(n)W (3)
the square of the error is:
e2(n)＝d2(n)-2d(n)XT(n)W+WTX(n)XT(n)W (4)
after mathematical expectation is taken at two sides of the above formula, the mean square error is obtained:
E{e2(n)}＝E{d2(n)}-2E{d(n)XT(n)}W+WTE{X(n)XT(n)}W (5)
defining a cross-correlation function vector:
and autocorrelation function matrix:
RXX＝E{X(n)XT(n)} (7)
the mean square error can be expressed as:
this indicates that the mean square error is a quadratic function of the weight coefficient vector W, which is a concave parabolic surface, which is a function with a unique minimum. Adjusting the weight coefficients to minimize the mean square error is equivalent to finding the minimum value along the parabolic curve, which can be found by gradient method.
Taking the derivative of the weight coefficient W according to the formula (8) to obtain the gradient of the mean square error function:
order to
The best weight coefficient vector can be found:
w is to beoptSubstituting formula (8) to obtain the minimum mean square error:
the formula (11) is used to find the exact solution of the optimal weight coefficient vector, and the steepest descent method is required. According to the steepest descent method, the weight coefficient vector W (n +1) at the next time should be equal to the current weight coefficient vector W (n) plus a negative mean square error gradient
Proportional term of (i), i.e.
Where μ is a constant that controls convergence rate and stability, and is called the convergence factor. By taking e directly2(n) as mean square error E { E }2(n) to solve for the estimated value of (n) }
Namely, it is
In the formula
Comprises the following steps:
the gradient estimate is obtained by substituting equation (14) into equation (13):
the next time weight vector coefficient and the current weight vector coefficient have the relation of
W(n+1)＝W(n)+2μe(n)X(n)。
Claims (4)
1. The error analysis and test system for the demagnetization system is characterized by comprising a signal conditioning unit, a controller unit, a current acquisition unit, a direct-current power supply module and a current acquisition box signal conversion module; the current acquisition unit comprises a sensor driving module and a current sensor;
the controller unit sends a current control signal through the first signal conditioning unit, the current control signal is input into the controller unit again through the second signal conditioning unit, and the controller unit acquires a real-time current control signal through extraction; the current control signal is output through the current calibration port and connected with a current sensor of the current acquisition unit, the output signal of the current sensor is transmitted to the signal conversion module of the current acquisition box through the sensor driving module, the signal conversion module of the current acquisition box outputs a recovery current signal which is transmitted to the controller unit through the third signal conditioning unit, and the current control signal and the recovery current signal form a calibration error of the test system;
the current control signal is connected with the current input end of the device to be tested through the current signal port, the current output end of the device to be tested is connected with the current sensor of the current acquisition unit, the output signal of the current sensor is transmitted to the signal conversion module of the current acquisition box through the sensor driving module, the signal conversion module of the current acquisition box outputs a recovery current signal which is transmitted to the controller unit through the third signal conditioning unit, the demagnetization controller transmits the magnetic signal of the device to be tested to the controller unit through the Ethernet, and the current control signal and the recovery current signal form the whole demagnetization system test system error;
the direct current power supply module converts alternating current 220V into working voltage of the sensor driving module to supply power to the sensor driving module, and the sensor driving module drives signals for the current sensor; the alternating current 220V supplies power to the controller unit through the power adapter.
2. The error analysis test system for degaussing system of claim 1, wherein the controller unit sends the current control signal comprises a constant control signal, a step control signal, a staircase control signal, and a sinusoidal control signal.
3. The error analysis and test system for the degaussing system of claim 1 or 2, wherein the signal conversion module of the current collection box is a filter for removing a noise interference signal filtering algorithm.
4. The method for testing the error analysis test system of the degaussing system of claim 3, comprising the steps of:
the first step is as follows: error analysis and testing system error calibration:
1) the controller unit outputs various current control signals from the DA0 through the first signal conditioning unit, the current control signals are recovered to the controller unit from the AD0 through the second signal conditioning unit to obtain real-time current control signals, and the signals are output through a control DA0 port;
2) the current control signal is transmitted to a current sensor of the current acquisition unit through a current calibration port, a sensor driving module transmits a recovery current signal acquired by the current sensor to a current acquisition box signal conversion module, a direct-current power supply module converts alternating current 220V into working voltage of the sensor driving module to supply power to the sensor driving module, and the sensor driving module supplies a current sensor driving signal;
3) the method comprises the following steps that a back-mining current signal is subjected to noise interference in the current signal in a signal conversion module of a current acquisition box through a signal filtering algorithm of a filter, the back-mining current signal is transmitted to a controller unit AD1 through a third signal conditioning unit, the controller unit compares a back-mining current control signal in AD0 with a back-mining current signal in AD1 to obtain the self error and the working time delay of an error analysis test system, and the controller unit respectively sends a constant value control signal, a step control signal and a sine control signal to sequentially obtain the normal state error, the transient state error, the static state error and the dynamic state error of the error analysis test system;
the second step is that: and (3) error analysis and test of a demagnetization system:
4) the controller unit outputs a current control signal from the DA0 through the first signal conditioning unit, the current control signal is recovered to the controller unit from the AD0 through the second signal conditioning unit to obtain a real-time current control signal, the current control signal is respectively given out a constant value control signal for measuring the normal state error of the tested equipment according to the test requirement and the process, a step control signal is given out for measuring the transient error of the tested equipment, a step control signal is given out for measuring the static error of the tested equipment, and a sine control signal is given out for measuring the dynamic error of the tested equipment;
5) respectively transmitting different types of current control signals to a current input end of a demagnetization system through a current signal port according to test requirements, converting the current control signals into magnetic signals by a magnetic signal conversion module in the demagnetization system, and receiving the magnetic signals by a magnetometer module;
6) the magnetometer module transmits the received magnetic signal to the demagnetization controller, the demagnetization controller transmits the value to the controller unit through the Ethernet, and the controller unit receives the value of the magnetic signal and calculates the value to obtain a current control value required by the demagnetization system;
7) the demagnetization controller transmits a current control value required by the demagnetization system to a demagnetization system power supply through a CAN bus, the demagnetization system power supply distributes a current value, the CAN bus is connected with a CAN port of an error tester, the error tester CAN monitor the output of the demagnetization controller through CAN bus data, and the output of the demagnetization controller CAN be simulated to test the demagnetization system power supply;
8) the current sensor receives a current value distributed by a power supply of a demagnetization system, the number of core penetrating turns of a current lead of the current acquisition unit is configured through demagnetization test software, a proportionality coefficient of the current acquisition unit is calculated according to a current sensor coefficient and the number of core penetrating turns of the current lead, and the current acquisition unit receives the configured number of core penetrating turns of the current lead and automatically changes a core penetrating loop so as to meet the configured number of core penetrating turns; converting the input demagnetizing system power supply current into a fixed value stoping current signal value, transmitting the fixed value stoping current signal value to a current acquisition box signal conversion module through a sensor driving module, acquiring a stoping current signal by test software, and multiplying the stoping current signal by a proportionality coefficient of a current acquisition unit to obtain an actual current value;
9) the stoping current signal value is subjected to a signal filtering algorithm of a filter in a signal conversion module of the current acquisition box, noise interference in the current is removed, and the stoping current value is input into the AD1 through a signal conditioning unit;
10) the total error and time delay of the whole demagnetization system and the error analysis test system are obtained by comparing the current control signal acquired by the AD0 with the constant value acquired current signal value in the AD1, wherein the error comprises a normal error, a transient error, a static error and a dynamic error;
the third step: and (3) error judgment:
removing the total error and the time delay obtained in the second step from the error value and the time delay of the error analysis test system obtained in the first step to obtain the error value and the time delay of the tested equipment, and when the error value and the time delay do not exceed the error range, judging that the hardware equipment to be tested of the demagnetization system is tested to be qualified under the error condition; and when the calculated error and the calculated time delay exceed the error range, judging that the hardware equipment to be tested of the demagnetization system is unqualified in the test under the error condition.
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