92 results about "Measuring output" patented technology

The invention provides a metering data automatic calibration method and system, and the method comprises the steps: obtaining an actual measurement output value of a target intelligent sensor for a measured physical quantity in a normal operation process of metering equipment, accessing a standard reference signal outputted by an external standard device subjected to the traceability of the quantity value, reading a pre-stored standard reference value and a standard threshold value, and carrying out the calibration of the measured physical quantity. According to the actually measured output value, the standard reference value and the standard reference signal, obtaining a standardized output value through a fitting mode; when the standardized output value exceeds a standard threshold value, switching to a calibration mode, providing forward and reverse standard input quantities by an external standard device, acquiring a response signal, and calculating a nonlinear compensation coefficient and a hysteresis correction coefficient; and updating the output correction parameter according to the compensation coefficient. By adopting the scheme of the invention, the cost constraint of different error attention in measurement data calibration can be realized, and the calibration robustness is improved.

The invention discloses a dynamic virtual impedance control method for multi-machine parallel connection of a network construction type energy storage converter, and belongs to the technical field of power electronics. The method aims to solve the problem that accurate reactive power distribution, circulating current suppression, dynamic response and voltage precision are difficult to consider in a multi-machine parallel system through fixed parameter virtual impedance. A dynamic adjustable virtual impedance module is introduced into the voltage outer loop output end of each converter, and virtual resistance and virtual inductance are calculated in real time based on locally measured output current, bus voltage change rate and adjacent machine reactive power deviation information; and the average reactive power of the system is estimated through a phase synchronization mechanism under the condition of no communication so as to realize multi-machine cooperation. According to the method, the reactive power distribution error is less than 5%, the bus voltage drop is less than 3%, the high-frequency circulating current is controlled within 5% of the rated current under all working conditions, and the dynamic performance and robustness of the system are remarkably improved.

Disclosed is a system for zero voltage switching in a power converter with a first half-bridge and a second half-bridge. The first half-bridge has a first set of transistors and output inductor. The second half-bridge has a second set of transistors and auxiliary inductor. A current sensing means measures, at switching cycle scale, average and maximum current values of output inductor and average, minimum and maximum current values of auxiliary inductor. A voltage sensing means measures input and output voltages of first and second half-bridge. A controller is configured to compute dead times of pulse width modulation control signal of second half-bridge, generate pulse width modulation control signal of second half-bridge and to adapt dead times of first half-bridge.

The invention discloses a spurious suppression method based on random phase shift, and the method comprises the steps: adjusting the amplitude and phase of each channel, enabling the amplitude and phase of each channel to be consistent, synthesizing the signals of each channel, and measuring the SFDR value S1 of a system; phase shifting is carried out on the input signal M1, the spurious phase in the output signal is measured, the spurious phase change M2 before and after phase shifting of the input signal is calculated, and the multiple relation n between M2 and M1 is calculated; all channels are divided into two groups randomly, the first group of channels does not change the phase of the input signal, and the second group of channels shifts the phase of the input signal, that is, the input signal is respectively input into a digital-to-analog converter; performing reverse phase shift on the output signals of the second group of channels in a digital domain, namely, recovering the phase of the output signals to be consistent with the phase of the first group of output signals, and outputting the phase difference pi between spurious output and spurious output of the first group of channels; and synthesizing two groups of signals, measuring the SFDR value S2 of the system, and comparing the SFDR value S2 with S1.

The present application relates to a device for testing electrical performance parameters of bipolar transistors, comprising a test fixture for operatively mechanically and electrically coupling a bipolar transistor to be tested, a test circuit for applying a test input signal to the transistor under test, a measurement circuit for measuring an output signal of the transistor and determining electrical performance parameters thereof, and a controller for automating the testing process and analyzing the measurement data, wherein the test fixture has fluid cavities formed through its length by one or more flow holes, and at least one cooling section in the form of a uniform or non-uniform spiral is arranged in each fluid cavity to extend along the corresponding fluid cavity. The test circuit comprises a signal generator for generating the input signal and a power supply for providing necessary bias voltages to the transistor; the measurement circuit comprises an oscilloscope for measuring the output signal and a computer for processing the measurement data; the controller is capable of automatically acquiring and analyzing the measurement data of the transistor to determine the electrical performance parameters.

The invention discloses a temperature monitoring system suitable for a fusion reactor low-clutter system and an over-temperature protection method. The temperature monitoring system comprises a high-speed temperature acquisition unit, a thermocouple sensor, an industrial control upper computer and a database server. A microwave excitation signal of the microwave excitation source is amplified by the microwave source klystron and then transmitted to the low-clutter coupled antenna through the microwave transmission line, and a plurality of temperature measuring points are arranged on the waveguide surface of the microwave transmission line and the end face of the low-clutter coupled antenna. Measurement output ends of the thermocouple sensors are uniformly accessed and gathered into the high-speed temperature acquisition unit and are uploaded to the industrial control upper computer, and the industrial control upper computer records and stores acquired multi-channel real-time temperature data, control signal output values and alarm events into the database server. The method has the advantages that early warning and temperature regulation are carried out for potential thermal runaway faults, so that the equipment safety of a high-power microwave transmission device and the normal operation of a low-clutter current driving system are guaranteed.

A method for detecting a deviation of a position sensor is provided, which detects a deviation in the mounting positions of position sensors of a motor. The invention is a method for detecting a deviation of a position sensor, wherein the method includes: switching on an energy supply to a U-phase conductor wire, a V-phase conductor wire and a W-phase conductor wire.-Conductor wire of a motor to rotate a rotor of the motor; switching off the power supply to the U-phase conductor wire, the V-phase conductor wire and the W-phase conductor wire when a rotor speed reaches a predetermined speed; measuring induced voltages generated in the U-phase conductor wire, the V-phase conductor wire and the W-phase conductor wire in the off state, calculating the positions of a U-phase tooth, a V-phase tooth and a W-phase tooth of the motor based on the induced voltages and measuring outputs from a U-phase position sensor, a V-phase position sensor and a W-phase position sensor; and calculating differences between intended and actual mounting positions of the U-phase position sensor, the V-phase position sensor, and the W-phase position sensor by comparing the calculated positions with the outputs. [Selected drawing].

Embodiments of the present application disclose a current measurement method and device, computer equipment and a computer readable storage medium. The method comprises obtaining a measurement range corresponding to a plurality of measurement ranges in a current measurement device and a calibration point, the calibration point comprising a calibration input value corresponding to each range and a corresponding calibration output value; inputting a plurality of input currents within the measurement range in the current measurement device to obtain a measurement output value corresponding to a current input value of the measurement range based on the input current; determining a linear mapping relationship corresponding to each range based on the calibration input value and the calibration output value, and calculating an input error corresponding to the current input value based on the linear mapping relationship; constructing an error mapping relationship corresponding to each range according to the measurement output value and the input error; and measuring a to-be-measured current based on the linear mapping relationship and the error mapping relationship. In this way, the accuracy of current measurement is improved, the measurement range of current measurement is improved, and the efficiency of current measurement is improved.

The application provides a differential pressure transmitter comprehensive compensation method based on Kriging interpolation and cubic spline interpolation, which comprises the following steps: measuring the calibration output voltage of a differential pressure transmitter at multiple temperature calibration points, static pressure calibration points and differential pressure calibration points to obtain data calibration points; fitting a variogram function theoretical model by using Kriging interpolation and obtaining a compensation matrix; establishing an output voltage model by using cubic spline interpolation; when the measured value of the ambient temperature is a temperature calibration point, the measured value of the static pressure is directly brought into the output voltage model to obtain a theoretical voltage, three calibration output voltages adjacent to the theoretical voltage are selected, a differential pressure function relationship is established by using cubic spline interpolation, and the measured output voltage is brought into the differential pressure function relationship to obtain a to-be-measured differential pressure; when the measured value of the ambient temperature is not a temperature calibration point, a compensation coefficient is determined by using the variogram function theoretical model, and the to-be-measured differential pressure is calculated by using the compensation coefficient. The application adopts cubic spline interpolation at the modeling temperature and adopts Kriging interpolation at the non-modeling temperature, so that the algorithm with large calculation amount can be used to improve the compensation precision, the repeated interpolation at each temperature and static pressure interval is avoided, the workload is reduced, and the real-time performance of the compensation is improved.

This utility model relates to a six-dimensional torque sensor system. Through integrated circuit design and packaging within the six-dimensional torque sensor, high-precision and highly sensitive deformation sensing and electrical signal conversion output are achieved via strain gauges on the elastic beams of the main frame structure. After specific measurement using a half-bridge differential Wheatstone bridge, the measured signal is amplified, filtered, and converted from digital to analog data by an ADC chip before being sent to a lower-level computer. The lower-level computer then reads the acquired sensor measurement signal, forming a high-precision circuit design specifically matched to the six-dimensional torque sensor. The coordinated installation of the strain gauges, half-bridge differential Wheatstone bridge, and ADC chip makes it less susceptible to environmental factors and effectively suppresses noise interference while achieving high signal gain, effectively realizing the measurement output function of the six-dimensional torque sensor.

The invention discloses a digital twinborn model construction method and device of a coal-fired power generation unit. The method comprises the steps that a mechanism model used for describing the running state of a coal-fired unit is constructed based on the structure and the running mechanism of the coal-fired unit; predicting historical input data based on the mechanism model to obtain mechanism prediction outputs corresponding to the historical input data; based on the actual measurement output and the mechanism prediction output of the same historical input data and the feature vector of unit operation, performing model training on the initial data driving model to obtain a target data driving model; and constructing a target digital twin model based on the mechanism model and the target data driving model. According to the method, the digital twinborn model of the coal-fired power generation unit can be accurately and reasonably constructed, and a foundation is laid for subsequent accurate prediction of the running state of the coal-fired power generation unit.

A technique for recursively determining the modulation index for controlling a DC-AC inverter is disclosed. The modulation index can first be selected. The input voltage to the power inverter can be measured. Based on the input voltage and the selected modulation index, the output voltage of the power inverter may be estimated. The output current of the power inverter can be measured. Using the estimated output voltage and the measured output current, the active power and reactive power can be determined. Using the active power and reactive power, the updated modulation index can be determined. The updated modulation index coefficient can be used to generate a pulse-width modulated signal used to control the power inverter.

To provide a force measuring device of sufficient accuracy combined with an appropriate and simple configuration.SOLUTION: A force-measuring device based on the principles of electromagnetic force compensation, comprising an electronic circuit driven by a direct current, the electronic circuit comprising an inductor, in particular a coil, a control unit for controlling a compensation force by controlling a current through the inductor as a function of a force to be measured, and means for providing a measurement output indicative of the force to be measured, wherein the control of the current comprises a dynamic switching of two switch states associated with two conducting directions of the inductor (1L, 2L).SELECTED DRAWING: Figure 2

The invention relates to the technical field of intelligent detection, particularly discloses an automatic detection system and method for optical characteristics of a semiconductor laser, and aims to solve the problems of lack of automatic wavelength test, poor multi-device collaboration and insufficient data quality control in the prior art. A laser driver, a power meter and a spectrograph are automatically identified and stable communication is established by scanning a communication port and inquiring equipment identifiers, test types, current sequence parameters and temperature setting parameters input by a user are received, equipment is controlled to execute automatic test according to the test types, output power and working voltage are measured through power test, and the output power and the working voltage are measured through temperature control. The wavelength test measures the output wavelength, collects data after the output of the laser is stable during the test, carries out signal-to-noise ratio screening on the wavelength data, generates a PIV characteristic curve and a wavelength tuning curve based on the processed data, and displays the PIV characteristic curve and the wavelength tuning curve on a user interface. According to the invention, cooperative detection of PIV and wavelength characteristics can be realized, data reliability and test efficiency are improved, and scene requirements of precise spectral analysis are met.

The invention discloses a calculation graph compilation error attribution method, system and equipment based on a benchmark reference model and a medium, belongs to the technical field of computers, and aims to solve the technical problem that in the model compilation optimization process of an AI compiler, when end-to-end test results are inconsistent, error sources are difficult to effectively attribut and position, and the calculation graph compilation error attribution accuracy is poor. According to the technical scheme, a reference path, an isolation to-be-measured path and an accumulation to-be-measured path are cooperatively executed for each node in a calculation graph, corresponding reference output, isolation to-be-measured output and accumulation to-be-measured output are respectively obtained, and differential analysis is carried out on the reference output, the isolation to-be-measured output and the accumulation to-be-measured output, so that the calculation graph is obtained. Compiling errors are accurately attributed to function errors of operators, internal calculation errors or transmission characteristics accumulated to the errors, and accurate positioning and quantitative analysis of the compiling errors are achieved; the method specifically comprises the following steps: constructing an initial calculation graph; initializing node attributes; and constructing a benchmark reference model.

The invention provides an environmental factor compensation method, device and equipment for a gallium nitride Hall current sensor, and relates to the technical field of sensors. The method comprises the following steps: acquiring an actually measured output voltage of a gallium nitride Hall current sensor under a current environmental condition; wherein the environmental conditions comprise temperature, humidity and electromagnetic interference intensity; inputting the actually measured output voltage and the current environmental condition into a trained environmental error compensation model to obtain current measurement compensation amounts corresponding to the actually measured output voltage and the current environmental condition; wherein the environmental error compensation model is used for representing a mapping relation between a current measurement error of the gallium nitride Hall current sensor and various environmental conditions; and compensating the output current corresponding to the actually measured output voltage based on the current measurement compensation amount to obtain an accurate current measurement value. According to the invention, on the premise that the hardware cost is not increased, the gallium nitride Hall current sensor can maintain excellent measurement performance in a full temperature range, a complex electromagnetic environment and a humidity condition.

The application discloses a chip buffer modeling method, system, device and circuit, obtains a measured output waveform of a chip to be modeled, and takes the measured output waveform as a simulation voltage source; obtains an actual output impedance of the chip to be modeled, and takes the actual output impedance as an impedance value of a simulation output resistance; establishes a buffer model of the chip to be modeled according to the simulation voltage source and the simulation output resistance; and the simulation output resistance in the buffer model is connected to an output end of the simulation voltage source. It can be seen that the application can establish a chip buffer model based on chip measured parameters in the case of lacking a chip model, thereby ensuring that simulation work is smoothly carried out, and helping to improve the PCB design effect; moreover, the chip buffer model established based on the chip measured parameters has a smaller difference from an actual chip buffer and higher accuracy; in addition, the chip buffer model has a simple structure and is easy to obtain, and compared with a complex model provided by a manufacturer, the complexity of model verification is lower.

The embodiment of the application provides a kind of controller test system, the overcurrent protection method of controller test system, belong to test technical field.The system includes the controller to be measured, load module, arbitration module, host computer, control module and power module, wherein: the output end of the controller to be measured outputs first branch current;Arbitration module is arranged between the controller to be measured and load module, is connected with output end and load respectively, and outputs second branch current.Determine arbitration by at least one of first branch current and second branch current, when arbitration result of determination represents that system exists exception, generate control instruction, to make at least one of arbitration module and load module and the controller to be measured disconnected, can realize the real-time monitoring of the controller to be measured, abnormality determination and fast protection, improve the accuracy and reliability of test system, meet the demand of frequent fault injection test scene.

The present invention relates to a substrate processing equipment, and more particularly, to a substrate processing equipment equipped with a current / voltage / power measurement module for measuring the current / voltage applied for generating and maintaining plasma during substrate processing using plasma, and further for measuring the power of incident and reflected waves. The present invention discloses a substrate processing equipment comprising a process chamber forming a sealed processing space in which plasma is formed to perform substrate processing; a substrate support unit disposed in the processing space on which a substrate is seated; and a gas injection unit for injecting a process gas into the processing space, wherein the substrate support unit includes a heater for heating the seated substrate, and a current / voltage / power measurement module for measuring an RF voltage, current, and power of an incident wave and a reflected wave generated by plasma in the processing space is installed adjacent to a heater power line for supplying power to the heater.

A quantum computing task processing method includes: performing transformation processing on input quantum states of n+m qubits through a parameterized quantum circuit, the n+m qubits including n task bits and m auxiliary bits; measuring output quantum states of the n+m qubits to obtain a bit string of the n+m qubits; updating parameters of the parameterized quantum circuit based on output quantum states of the n task bits when an auxiliary substring satisfies a post-selection condition and the parameterized quantum circuit has not converged, the auxiliary substring being a substring corresponding to the m auxiliary bits in the bit string; and obtaining a computing result of the target quantum computing task based on the output quantum states of the n task bits when the auxiliary substring satisfies the post-selection condition and the circuit has converged.

Contactless energy transfer device (1), comprising: a transmitter (2); and a receiver (3) which is configured to receive electrical energy from the transmitter (2) in a contactless manner, where the transmitter (2) has: a transmitting coil (14) which is set up to supply electrical energy to the receiver (3), a power supply circuit (10) which is set up to supply alternating current energy to the transmitting coil (14) with an adjustable switching frequency and an adjustable voltage, a current sensing circuit (16) which is set up to measure a current through the transmitting coil (14) and to determine a measured value of the current, a control circuit (19) which is set up to control the switching frequency and the voltage of the alternating current energy which is supplied to the transmitting coil (14) by the power supply circuit (10), and a first communication device (17) that is set up to communicate with the receiver (3), where the receiver (3) has: a resonant circuit (20) comprising a receiving coil (21) configured to receive electrical energy from the transmitter (2) and a resonant capacitor (22) configured to resonate with the receiving coil (21) in response to electrical energy from the transmitter (2), a rectifier circuit (24) which is set up to rectify electrical energy output by the resonant circuit (20), a short-circuit circuit (30) which is configured to switch between short-circuiting and opening the resonant circuit (20), a voltage detection circuit (28) which is set up to measure an output voltage of an electrical energy output by the resonant circuit (20) and to determine a measured value of the output voltage, a second communication device (31) which is set up to communicate with the transmitter (2), and a determination circuit (29) configured to determine whether the measured output voltage is within a predetermined permissible voltage range, and to cause the short-circuiting circuit (30) to short-circuit the resonant circuit (20), and to cause the second communication device (31) to transmit determination information indicating that the contactless power transfer device (1) is not performing a constant voltage output operation in which the output voltage from the rectifier circuit (24) is a constant voltage, even if a resistance of a load circuit (27) connected to the rectifier circuit (24) changes when the measured output voltage is outside the predetermined permissible voltage range, and wherein the control circuit (19) in the transmitter (2) detects a switching frequency of the alternating current energy in response to the determination information received by the receiver (3) through the first communication device (17), which indicates that the contactless energy transfer device (1) is not performing a constant voltage output operation, at which the contactless energy transfer device (1) performs the constant voltage output operation according to the measured current.

The present invention relates to a substrate processing equipment, and more particularly, to a substrate processing equipment equipped with a current / voltage / power measurement module for measuring the current / voltage applied for generating and maintaining plasma, and further for measuring the power of incident and reflected waves. The present invention discloses a substrate processing equipment comprising a process chamber, a substrate support unit, a gas injection unit, and at least one RF power source. The substrate support unit includes a heater and an RF energy blocking part installed above the heater. A current / voltage / power measurement module is installed adjacent to a grounding wire, which is connected to the RF energy blocking part, to measure the RF voltage, current, and power of an incident wave and a reflected wave generated by the plasma.

The application provides an electrical performance test method and device, a test machine and a storage medium, and relates to the technical field of integrated circuit testing. The method comprises: performing initial parameter configuration matched with a test scene, so that a source measurement output unit outputs an excitation signal according to an expected excitation value contained in the initial parameters, and the output process of the excitation signal comprises an excitation signal establishment stage and an excitation signal execution stage; in the excitation signal establishment stage, the source measurement output unit is controlled to perform stability adjustment on the output excitation signal until the excitation signal is successfully established; if it is detected that the excitation signal is successfully established, the excitation signal execution stage is entered, and based on the excitation signal output by the source measurement output unit, electrical performance testing related to the test scene is performed on a measured object. The application solves the problem of insufficient reliability of an excitation signal in electrical performance testing in the related art.

The application provides a kind of ambient temperature self-adaptive output compensation method and device of power electronic conversion device, comprising: every interval first preset length, determine the reference compensation amount of current time power electronic conversion device, reference compensation amount is in the process of normalizing power electronic conversion device measured output value, the difference between the measured output value under the measured ambient temperature and the measured output value under the reference ambient temperature;Based on reference compensation amount, calibrate the expected output value, sampling output value of power electronic conversion device, respectively obtain new expected output value, actual output value;Expected output value and actual output value are sent to operation module, so that operation module determines output compensation value based on expected output value and actual output value, and output compensation value is used to control module to regulate the output of power electronic conversion device.The application makes the output of power electronic conversion device dynamically adjusted with internal environment temperature in the calibration process, so as to improve the output accuracy of power electronic conversion device.

The invention discloses a calibration method and device of a digital-to-analog converter chip, electronic equipment and a storage medium, and belongs to the technical field of computers. The method comprises the following steps: respectively converting different digital quantities into control instructions and inputting the control instructions into a digital-to-analog converter chip of the high-voltage terminal equipment; measuring the output voltage of a high-voltage plate in the high-voltage terminal equipment after each digital quantity is input into the digital-to-analog converter chip; fitting each digital quantity and the output voltage corresponding to each digital quantity to obtain a relation model representing the relation between the digital quantity and the output voltage; and storing parameters of the relation model into a nonvolatile memory. The digital quantity and the output voltage are fitted to establish the relation model of the digital quantity and the output voltage, the obtained relation model can accurately reflect the characteristics in the actual conversion process, and the digital-to-analog converter chip can be corrected according to the relation model in the subsequent work, so that the conversion error is reduced, the precision of the digital-to-analog converter chip is improved, and the conversion efficiency is improved. Accurate control of the output of the high-voltage terminal equipment is realized.

The invention discloses a high-frequency signal measuring device and method based on a programmable Josephson voltage standard. Comprising a high-frequency to-be-measured signal source and a programmable Josephson voltage standard source, the high-frequency to-be-measured signal source outputs a to-be-measured high-frequency periodic voltage signal and a same-frequency and same-phase clock signal, and the device further comprises a latch comparison probe, a phase adjusting module and a microprocessor. A to-be-measured high-frequency periodic voltage signal output by the high-frequency to-be-measured signal source and a standard source signal of the programmable Josephson voltage standard source are simultaneously connected with two comparison signal input ends of the latch comparison probe, and a clock signal of the high-frequency to-be-measured signal source is connected with the phase adjusting module. An output pulse signal of the phase adjusting module is connected with a control input of the latch comparison probe, and the microprocessor is respectively connected with the phase adjusting module, the latch comparison probe, the programmable Josephson voltage standard source and the upper computer. According to the invention, a novel measurement scheme with higher precision and stronger realizability is provided for high-frequency voltage calibration and quantum metering application.

A method for determining a temperature of an Insulated-Gate Bipolar Transistor (“IGBT”) driver, the IGBT driver may include two Metal-Oxide-Semiconductor Field-Effect Transistor (“MOSFET”) elements, two direct voltage terminals for providing a base direct voltage for the two MOSFET elements, two gate terminals for providing two control voltages for the two MOSFET elements, a measurement output for outputting an output voltage, and an alternating voltage source for providing an alternating voltage, the method may include providing the control voltages, the base direct voltage, and the alternating voltage, superimposing the alternating voltage with the base direct voltage, capturing the output voltage at the measurement output of the IGBT driver, and determining the temperature of the respective MOSFET elements from the captured output voltage.

The utility model discloses a kind of backlash detection clamps of robot joint speed reducer, belong to robot precision transmission technical field.The fixture includes bottom plate, fixed mechanism, input end locking mechanism, output end loading mechanism and detection mechanism.Fixed mechanism is used to install measured speed reducer.Input end locking mechanism is used to lock speed reducer input end.Output end loading mechanism is connected to output end, for applying preset torque of clockwise and counterclockwise.Detection mechanism is also connected to output end, for measuring the angular displacement difference of output end according to above-mentioned torque, to obtain backlash value.The utility model directly locks input end and quantitative loading by mechanical structure, directly measures in combination with high-precision angle sensor, effectively eliminates the hunting and transmission error in measurement process, realizes high-precision, high repeatability fast detection to speed reducer backlash under low-cost premise, structure is solid, easy to operate, especially suitable for batch inspection in production site.

An electronic device with a power output from a power source configured to provide a voltage. A device may include a current sensor configured to measure the output current. A device may include a power switching network electrically connected between the power source and the power output. A device may include a controller electrically connected to the current sensor and the power switching network, the controller being configured to determine the output current using the current sensor.A device can include comparing the output current with a predetermined load current threshold, determining a voltage limit of the power source voltage depending on the difference between the output current and the predetermined load current threshold, and controlling the output current to drive the load via the power switching network based on the voltage limit.

An assembly includes at least three strain gauges and is attached to an elastic transmission element of a strain wave gearing. The assembly is designed to measure a torque acting on the elastic transmission element. Output signals from each of the strain gauges are measured. The output signal of one of the strain gauges is predicted from the measured output signals of the other strain gauges. An error message is output based on the predicted output signal deviating from the respective measured output signal by more than a predetermined tolerance.