Abstract: Provided is a self-calibrating time code generator and method for generating an accurate time code (e.g., an accurate IRIG waveform). The self-calibrating time code generator includes a phase-locked loop configured to provide a generated output signal based on a phase difference between an absolute time reference signal and a compensated generated input signal, an IRIG encoder configured to couple a present time value with the generated output signal to form an IRIG waveform, a delay difference indicator configured to provide a time interval value based on a comparison of corresponding pulse edges of the generated output signal and the IRIG waveform, and a numerical delay component configured to delay the generated output signal by the time interval value to form the compensated generated input signal used to time-align the IRIG waveform with the absolute time reference signal to form the accurate IRIG waveform.

Abstract: A system and method for controlling a mass flow controller to have a constant control loop gain under a variety of different types of fluids and operating conditions, and for configuring the mass flow controller for operation with a fluid and/or operating conditions different from that used during a production of the mass flow controller. Further, the system and method includes providing control by reducing the effects of hysteresis in solenoid actuated devices by providing a non-operational signal to the solenoid actuated device.

Abstract: An analog-to-digital converter (ADC) exhibiting an uncorrected non-linear transfer function receives measured analog voltage amplitudes and outputs uncorrected digital values. A calibration circuit receives each uncorrected digital value and outputs a corrected digital value. The measured analog voltage amplitudes received by the ADC and the corresponding corrected digital values output by the calibration circuit define points approximating an ideal linear transfer function of the ADC. The calibration circuit performs piecewise-linear approximation of the uncorrected transfer function and associates each uncorrected digital value with one of N linear segments that join at inflection points on the uncorrected transfer function. The inflection points are determined using the second derivative of the uncorrected transfer function. The calibration circuit calculates each corrected digital value using no more than 2N+2 stored calibration coefficients.

Abstract: Calibration of a sensor circuit that includes a sensor, a temperature measurement circuit and a signal processing path. The sensor senses a physical parameter to be measured and generates an electrical sensor output signal representing the physical parameter. The temperature measurement circuit outputs a measured temperature. The signal processing path is coupled to the sensor so as to receive the electrical sensor output signal and use the measured temperature to compensate for temperature variations in the electrical sensor output signal. During calibration, the output voltage of the signal processing path is measured at multiple temperatures, and at multiple values of the physical parameter being measured at each temperature while the signal processing path is disconnected from using the measured temperature of the temperature measurement circuit.

Abstract: Systems and methods for compressing and encoding data are disclosed. According to one embodiment, a method is provided for communicating known calibration data for a microsurgical cassette to a surgical console with which the cassette will be used.

Abstract: The present invention is directed to a diagnostic compiler for use with a pipeline analog-to-digital converter (ADC) having code sequences corresponding to stages thereof. In one embodiment, the diagnostic compiler includes a transition locator configured to determine transition locations for the code sequences. The diagnostic compiler also includes a characteristics indicator coupled to the transition locator and configured to provide at least one characteristic of the ADC based on the transition locations.

Abstract: A method of signal processing includes receiving an unknown signal having a distorted component and an undistorted component, the distorted component and the undistorted component having a nonlinear relationship; and separating from the unknown signal a reference component and a target component. A signal processing system includes an input terminal configured to receive an unknown signal having a distorted component and an undistorted component, the distorted component and the undistorted component having a nonlinear relationship; and a separation block coupled to the input terminal, configured to separate from the unknown signal a reference component and a target component.

Abstract: A method and apparatus adapted to calibrate a signal path of a signal analysis system such that loading effects of the system are substantially removed from measurements of a device under test. A signal under test from the device under test is coupled to a test probe in the signal path and used with selectable impedance loads in the test probe to characterize transfer parameters of the device under test. An equalization filter in either the frequency or time domain is computed from the device under test transfer parameters for reducing in signal error attributable to the measurement loading of the device under test.

Abstract: Calibration of a sensor circuit that includes a sensor, a temperature measurement circuit and a signal processing path. The sensor senses a physical parameter to be measured and generates an electrical sensor output signal representing the physical parameter. The temperature measurement circuit outputs a measured temperature. The signal processing path is coupled to the sensor so as to receive the electrical sensor output signal and use the measured temperature to compensate for temperature variations in the electrical sensor output signal. During calibration, the output voltage of the signal processing path is measured at multiple temperatures, and at multiple values of the physical parameter being measured at each temperature while the signal processing path is disconnected from using the measured temperature of the temperature measurement circuit.

Abstract: A Bemf detect circuit is configured for modeling Bemf error via calculation of time correlations associated with two or more different non-calibrated sense resistor gain values to derive a calibrated sense resistor gain value. A method is provided for calibrating a Bemf detector circuit by setting a sense resistor gain to a plurality of different gain values, observing Bemf sample values for each of the gain values, and deriving a calibrated gain value by non-iteratively modeling the relationship between the gain values and the associated Bemf sample values.

Abstract: A method and system for providing a linear signal from mass flow transducer approximates the error from the original raw signal using discrete sine functions and subtracts the approximated error from the original raw signal. The method and system can be implemented using an ASIC (Application Specific Integrated Circuit) mated with a raw mass flow transducer. The method and system for linearizing the signal can be contained in the ASIC, and allows for improved accuracy in the linear signal with few coefficients and mathematical steps.

Abstract: A flexible process optimizer for recording and analyzing various parameters to improve the efficiency of a production process. The flexible process optimizer acquires and conditions signals from a variety of transducers mounted on a production machine. Through qualitative and quantitative data analysis, specific aspects are of the production process which need improvement are identified. The qualitative evaluation looks at the presence, absence, or duration of certain features of the production cycle as revealed by the sensor data. The quantitative evaluation of data involves the computation of certain data attributes. By providing useful data acquisition and data analysis tools, necessary adjustments are made to the required parameters of the production process to provide improved efficiency. The results of the changes are immediately verifiable using the flexible process optimizer.

Abstract: A system for training a linearization compensation model includes a tone generator for providing at least two different RF tones, receiver path components for processing the RF tones, an analog-to-digital converter for converting the processed RF tones into digital signals, and a processor for using the digital signals to generate the linearization error compensation model. The resulting compensation model is particularly useful in a linearization system which includes a receiver for measuring a signal, an electro-optical modulator configured for converting the measured signal to an optical signal, an optical-electrical detector configured for converting the optical signal to an analog electrical signal, an analog-to-digital converter for converting the analog electrical signal into a digital signal with the processor being used for removing linearization errors from the digital signal.

Abstract: The present invention provides methods for high throughput analysis of analytes in complex mixtures for unresolved chromatographic peaks including specific embodiment for summing intensities for each mass transition of interest over a selected chromatographic peak (50) to generate a signal corresponding to total intensity for each transition (55, 60). The intensities are deconvoluted into intensities of individual analytes (65, 70), based on branching ratios acquired from authentic standards, and a comparison to calibration curve is performed to obtain a quantitative concentration measurement of a particular analyte in a sample.

Abstract: The position of an object, which may be a user's finger, along a body is sensed capacitively. A measurement circuit meters the simultaneous injection of electrical charge into the two ends of the body, which may be shaped as a straight line or as a curve. A computing device computes the ratio of the relative changes in the amount of charge injected into each end of the element. The result of this computation is a one dimensional coordinate number plus a detection state indication, both of which can be fed to another functional element, such as an appliance controller, which interprets the coordinate and detection state as a command or measurement.

Abstract: A calibration unit and technique for calibrating A/D systems (e.g., data acquisition devices) using a pulse-width modulation (PWM) circuit to reduce nonlinearity. The calibration unit may be coupled to an analog-to-digital module (ADM) of the A/D system. The PWM circuit may generate a calibration signal with intentional ripple, which may exercise a region of a transfer curve of the ADM to reduce local nonlinearities in measurements associated with the calibration of the system. Pulse trains of varying frequency and duty cycle may be generated to sweep the PWM circuit through an ADM range and to calculate an ADM linearity correction function, which may be used to perform gain and offset correction with respect to a best-fit line through an ADM transfer curve to reduce large signal nonlinearities. The PWM circuit may include a resistor divider circuit including a plurality of taps to calibrate small input ranges.

Abstract: According to one aspect of the present invention, there is provided a method of calibrating an oscillator within a radio-frequency identification (RFID) circuit for use in an RFID tag. A plurality of calibration values is stored within a memory structure associated with the RFID circuit. Each of the calibration values corresponds to a respective oscillation frequency of the oscillator. A selected calibration value is selected from the plurality of calibration values stored within the memory structure, according to a first selection criterion. The oscillator is then calibrated in accordance with the selected calibration value.

Abstract: A method for processing measuring data and a device to perform the method, wherein the measuring data can be determined by using a measurement system, more particularly a chromatographic analyzing system, for the measurement of measuring values that correspond to certain information about, or of, a technical process and that depend on at least two variables.

Abstract: An apparatus for improving the procedure for quantifying the volume of liquid dispensed by a liquid-dispensing mechanism of an analytical instrument. The apparatus of this invention comprises (a) at least one weigh cup; (b) at least one standard mass; (c) at least one transducer assembly to convert a value of weight to an electrical response; and (d) at least one electronic circuit for converting the electrical response to a measurement of volume. This invention provides a method for calibrating readings of the volume of liquid dispensed by a liquid-dispensing mechanism of an analytical instruments so that absolute measurements of the volume of liquid dispensed can be obtained.

Abstract: Above a measuring object (2), an LEDs (4) for use in light irradiation and a CMOS area sensor (8) with an image-forming lens (6) interpolated in between are installed. In order to detect the quantity of light from the LEDs (4), a photodetector (10) is further placed. A personal computer (28) carries out a linearizing process which, upon variation of the quantity of light, corrects the output of the area sensor (8) so as to make the output from the area sensor (8) proportional to the output of the photodetector (10), and a light-irregularity correction process which, when a flat plate having even in-plane density is measured as the measuring object (2), corrects the resulting output of each pixel in the area sensor (8) that has been corrected by the linearizing process to have in-plane evenness. It becomes possible to achieve a convenient two-dimensional reflection factor measuring method which does not need any mechanical driving system.

Abstract: A predistorter (26) comprises an array (44) of band pass filters (46 to 52) which divide an input signal into components. Each of the components is manipulated using coefficients retrieved from respective look-up tables (54 to 60). The amplitude of each component is used to retrieve a coefficient from its respective look-up table. The amplitude of each component is then multiplied with its respective retrieved coefficient to generate a predistorted amplitude for that component. The predistorted amplitudes are summed (at 80) to produce a predistorted input signal. The predistortion of the input signal is arranged to counter the distortion characteristic of a signal handling element (such as non-linear power amplifier 22 in FIG. 1) to which the predistorted input signal is subsequently supplied. The coefficients in the look-up tables (54 to 60) can be adapted using feed back from the output of the signal handling means (FIG. 5).

Abstract: A method for linearizing a nonlinear curve with a linearization circuit (1), wherein the curve represents the relationship between input signals and output signals of a sensor. An output signal (100, 110, 120) of the sensor, which is respectively associated with an input signal, is displayed with respect to a simple and cost favorable linearization such that the adjustment of the linearization circuit (1) essentially occurs in an automated way utilizing sequence controller (2). A corresponding circuit is also described for practicing the method.

Abstract: Disclosed herein is a method and system for calibrating line drive currents in systems that generate data signals by varying line drive currents and that interpret the data signals by comparing them to one or more reference voltages. The calibration includes varying the line drive current at a transmitting component. At different line drive currents, a receiver reference voltage is varied while the transmitting component transmits data to a receiving component. At each line drive current, the system records the highest and lowest receiver reference voltages at which data errors do not occur. The system then examines the recorded high and low receiver reference voltages to determine a desirable line drive current.

Abstract: A method for testing the linearity or non-linearity of an actual analyte concentration and a test result, where the actual concentration of the analyte and a test result are determined so that a computation based upon an algorithm may be performed, which allows computation of various variables so that regression may be performed and the linear significance may be determined.

Abstract: Described is a method for calibrating a spectrophometric apparatus. This method involves obtaining a first set of absorbance measurements of a set of calibrators on a First Apparatus that is in control at wavelengths from a first wavelength calibration table. A second wavelength calibration table on a second apparatus is established, wherein the first and the second wavelength calibration tables may be the same or different. A second set of absorbance measurements of the set of calibrators is obtained on the Second Apparatus, at wavelengths from the second wavelength calibration table. First and second interpolated absorbances are determined, for the first and the second absorbance measurement, respectively, for at least one wavelength of a Standard Set of Wavelengths. Using the first and the second interpolated absorbances, a linear regression equation for each wavelength of said Standard Set of Wavelengths is determined.

Abstract: In a signal acquisition system in accordance with the principles of the present invention, a digital signal acquisition system includes a front end, an equalizer and an output system. The front end typically includes an input amplifier and may include one or more preamplifiers, and any one of various input probes. The probes may be directed toward different applications, that is, voltage probes or current probes, for example, and may include preamplifiers that adjust the range of input signals. The output of the probe is typically routed to an input amplifier, which may include various filters and/other signal conditioning circuitry. The system also includes an analog to digital converter that is arranged to receive a conditioned analog input signal from the input amplifier. The analog to digital converter converts the conditioned analog input signal to digitized input signal.

Abstract: The A/D-converter with optional analog preprocessing comprises two analog inputs (I1, I2), wherein a converter (1, 2) is connected to each input for generating a first and a second digital value (D1, D2) respectively. These are fed to a table (3) for generating a lookup value (D). A decimation filter (4) processes several such lookup values and generates an output value (O). With this arrangement the table can be kept comparatively small while it is still possible to reach high resolution and precision. The A/D-converter is especially suited for applications where two or more analog signals have to be combined and digitized.

Abstract: A power meter is provided having an auto-calibration feature and a data acquisition node for measuring the power usage and power quality of electrical power in an electrical power distribution network. The auto-calibration feature calibrates the power meter at predetermined time increments and as a function of temperature changes.

Abstract: Electron beam (e-beam) shot linearity monitoring is disclosed. A pattern is written that has a predetermined size and a predetermined form in a predetermined position on a substrate, such as a semiconductor wafer, a reticle, or a photomask. The pattern writing fixes the e-beam shot size, as located along one or more critical dimensions of the pattern. The critical dimensions are then measured, where their variations reflect the e-beam shot size linearity. Thereafter, deficiencies in the e-beam shot size linearity can be compensated for, to allow for properly produced semiconductor patterns.

Abstract: Described is a method for calibrating a spectrophotometric apparatus. This method involves obtaining a first set of absorbance measurements of a set of calibrators on a First Apparatus that is in control at wavelengths from a first wavelength calibration table. A second wavelength calibration table on a second apparatus is established, wherein the first and the second wavelength calibration tables may be the same or different. A second set of absorbance measurements of the set of calibrators is obtained on the Second Apparatus, at wavelengths from the second wavelength calibration table. First and second interpolated absorbances are determined, for the first and the second absorbance measurement, respectively, for at least one wavelength of a Standard Set of Wavelengths. Using the first and the second interpolated absorbances, a linear regression equation for each wavelength of said Standard Set of Wavelengths is determined.

Abstract: Above a measuring object (2), an LEDs (4) for use in light irradiation and a CMOS area sensor (8) with an image-forming lens (6) interpolated in between are installed. In order to detect the quantity of light from the LEDs (4), a photodetector (10) is further placed. A personal computer (28) carries out a linearizing process which, upon variation of the quantity of light, corrects the output of the area sensor (8) so as to make the output from the area sensor (8) proportional to the output of the photodetector (10), and a light-irregularity correction process which, when a flat plate having even in-plane density is measured as the measuring object (2), corrects the resulting output of each pixel in the area sensor (8) that has been corrected by the linearizing process to have in-plane evenness. It becomes possible to achieve a convenient two-dimensional reflection factor measuring method which does not need any mechanical driving system.

Abstract: A system and method for improving linearity of data outputted from an analog-to-digital converter and reducing digitization artifacts, is provided. A noise generator is provided for generating noise and adding the noise to at least one code word that is introduced to the system, wherein the at least one code word comprises a unitary portion and a fractional portion, the noise being added to the fractional portion of the at least one code word. A storage device is also located within the system for storing the at least one code word, and a high threshold and a low threshold for each of the at least one code word. The storage device is capable of outputting the high threshold and the low threshold of the at least one code word as a result of receiving the unitary portion of the at least one code word, wherein the low threshold and the high threshold, in combination with the fractional portion, are utilized to derive linear digital data having a uniform resolution.

Abstract: A compensated sensor includes a sensor, a relatively fast feedthrough path, and a relatively slow compensation path. The relatively fast feedthrough path includes a summer and output circuitry, such as a summing amplifier. The relatively slow compensation path includes circuitry that produces one or more correction factors for such sensor deficiencies as temperature dependency, or nonlinearity effects, for example. These one or more correction factors are fed to the summer for summing with the uncompensated sensor output. Additionally, the output of the output circuitry (e.g., summing amplifier), is fed back to the compensation circuitry where it is compared to a compensated sensor output developed by the compensation circuitry. The difference between the compensated sensor signal developed in the compensation circuitry and the output signal fed back to the compensation circuitry is also provided to the summer for summing with the one or more correction factors and the uncompensated sensor output.

Abstract: A calibration system for a platesetter or imagesetter is applicable to systems that have a media drum and a carriage, including a light source and a spatial light modulator for selectively exposing the media that is held against the drum. The invention can be applied to internal or external drum systems. The calibration system comprises a calibration sensor that is scanned relative to the spatial light modulator. The controller then analyzes the response of the calibration sensor to generate calibration information that is used to configure the spatial light modulator. The use of this calibration sensor allows for job-to-job calibration of the spatial light modulator, in one example, that ensures; the generation of a high quality images, without banding, for example, on the media. This calibration system is also used to detect a best focus position for projection optics by measuring a contrast ratio between exposure and dark levels for various focus settings.

Abstract: A method for correcting non-linearities of an output signal of an electrical component with the aid of a characteristics map that is defined by discrete interpolation points. In this context, the adjacent interpolation points of the characteristics map are ascertained as a function of at least one signal influencing the non-linearities of the output signal. Interpolation is carried out between these interpolation points, and a corresponding correction signal is ascertained as a function of the or each signal by an interpolation. The output signal of the electrical component is corrected as a function of the correction signal. To improve the correction of non-linear transfer characteristics and/or temperature responses of the electrical component, it is proposed that the or each signal for addressing the characteristics map be high-pass filtered, and the correction signal be ascertained as a function of the or each signal by the interpolation and a subsequent low-pass filtering.

Abstract: In a signal acquisition system in accordance with the principles of the present invention, a digital signal acquisition system includes a front end, an equalizer and an output system. The front end typically includes an input amplifier and may include one or more preamplfiers, and any one of various input probes. The probes may be directed toward different applications, that is, voltage probes or current probes, for example, and may include preamplifiers that adjust the range of input signals. The output of the probe is typically routed to an input amplifier, which may include various filters and/other signal conditioning circuitry. The system also includes an analog to digital converter that is arranged to receive a conditioned analog input signal from the input amplifier. The analog to digital converter converts the conditioned analog input signal to digitized input signal.

Abstract: Apparatus and method having a probe and readout for taking electromagnetic field measurements by acquiring raw data and linearizing the data either during processing or after processing by using a curve-fitting equation to non-linearly interpolate between calibration data points. A curve-fitting equation of the form V/m=a+bxc is used for selected segments of the data and the invention requires only the retention of numerical values for the coefficients a, b, and c for each data segment. The coefficient values are stored in the probe and used either by the probe or the readout to construct calibrated data in volts per meter (V/m).

Abstract: A digital electronic control unit that provides an efficient, miniature, reliable and cost-effective control mechanism for use in household and commercial appliances. It further is capable of real-time-based control, remote control and networking.

Abstract: A method is provided to determine an rpm profile for a turbine pump from pulse train data obtained from a sensor at the pump. The method eliminates ramp-up spikes from the pulse train by comparing the spike pulse count to the surrounding pulse counts and replacing data points responsible for abnormal pulse count increases/decreases between data points with interpolated values. The method similarly replaces data points that lie outside statistically acceptable pulse rate variations. A rough rpm plot is then generated, which must be smoothed to obtain the final rpm profile. Data points are infused between sensor data points to achieve an acquisition rate of approximately 1000 points per second. The infusion is accomplished by interpolating between sensor data points and equally spacing the infused data points along the interpolated curve. A smoothing function is then applied to the infused data set.

Abstract: The invention refers to a method for calibrating the control of a radiation device producing electromagnetic radiation or particle radiation in a rapid prototyping system.

Abstract: A method for linearizing an amplifier to produce an amplified output signal from a set of carrier frequencies is disclosed in which a set of digital baseband signals corresponding to the set of carrier frequencies are combined to produce an extended digital baseband signal. Look-up values are then derived from the power values of the extended digital baseband signal and applied to a look-up table to obtain predistortion values. One or more predistorted signals are then produced by complex mixing the predistortion values with one of the set of extended digital baseband signals. The predistorted signal(s) are then amplified to produced an output signal which is linearly related to the set of digital baseband signals.

Abstract: A system and method for generating a linearized sensor signal p from a sensor signal m using a kth-degree polynomial The coefficients of the kth-degree polynomial can be calculated using a least-squares method by a computer. The computer can calculate for 1<j≦k the (2j−1) root of the jth coefficient aj of the kth-degree polynomial and download the coefficients and the resulting roots rj to a storage device in a digital signal processor (DSP).

Abstract: A method for calibrating analog sensor measurements within a computer system is disclosed. The method includes the steps of generating an analog sensor measurement result, reading at least two values that define a curve from a memory device, and calculating a calibrated result using the analog sensor measurement result and the values that define the curve.

Abstract: A torsional vibration measuring instrument which can be placed in a narrow space to measure the torsional vibration of a rotated object, is portable, avoids the possibility of occurrence of unrecorded data, stores recorded data in a detachable storage means, can be attached to a portable data analyzing/processing device, and can transmit the analyzed data. A portable torsional vibration measuring instrument (data logger) has a display means which can display at least the rotational speed and the torsional amplitude and a storage means in which recorded data are stored and which is detachably attached to the casing of the instrument. By attaching the storage means to a portable data analyzing/processing device (notebook personal computer), frequency analysis can be carried out and the recorded data stored in the storage means can be transmitted.

Abstract: A linearization circuit includes a sensor circuit having a first terminal receiving an excitation voltage, and second and third terminals producing a sensor output voltage therebetween. A differential amplifier circuit produces a linearization current, and a scaling circuit operates to produce a scaled linearization current in response to the linearization current. A current direction switch circuit includes a fourth terminal receiving the scaled linearization current, a fifth terminal and conducting a correction current proportional to the linearization current, and a control terminal receiving a polarity control signal to determine the direction of flow of the correction current through the fifth terminal in response to the sensor output voltage.

Abstract: A computer-implemented statistical technique is provided for normalizing the response curves of multiple measurement methods. The end result is a group of response curves, one for each measurement method under consideration, which depend on a common independent variable—the actual physical property being measured by the methods. The results are provided as a collection of equations, curves, and/or tables (a “nomogram”) to facilitate conversion of measured values from one method to measured values from a second method. In the technique, data is provided for each of the methods being normalized. The input data includes measured values from common samples which are analyzed by two or more of the methods under consideration. The technique also requires assumptions or approximations of the true physical property values for each of the samples used to generate the data. Still further, the technique requires assumptions of the mathematical form of the response curves (e.g., linear, sigmoidal, etc.

Abstract: A signal converter which receives signals from a plurality of sensor terminal ends to detect physical quantities in a plant and conducts a necessary correction for the signals to send the signals to a host computer or which transmits signals from the host computer to operation terminal ends in the plant includes a sensor terminal end amplifier including a processing unit for receiving a signal from a sensor terminal end and conducting a predetermined amplifying operation for the signal and a storage unit in which information items related to the sensor terminal and the processing unit are stored, an operation terminal end amplifier including a converting unit for converting signals into predetermined control signals which can be received by the operation terminal end and a storage unit in which information items related to the operation terminal end and the converting unit are stored, and a signal converting section including a connecting unit for connecting the sensor terminal amplifier section to the operat

Abstract: The method of self-calibrating for a sensor without using an additional device by using data sampling, an approximate value of linear errors obtained by performing the numerical integration of approximate values of a linear-error derivative, correcting the approximate value of the input value at each sampling point, and repeating the processing for correcting the approximate value of the linear error by necessary times.

Abstract: An acceleration sensor includes a sensing unit for detecting impact acceleration and a signal processing unit for measuring the magnitude of the detected acceleration. The signal processing unit has functions of calculating the sensitivity of the sensing unit when specific acceleration is applied to the sensing unit in an inspection stage, storing the calculated sensitivity, and correcting the output of the sensing unit according to the stored sensitivity in actual operation.

Abstract: In a method for calibrating the deflection control of a laser beam a light-sensitive medium (5) is exposed to a laser beam (2) at predetermined positions for generating a test pattern (20), thereafter digitized partial pictures of pattern portions (21) of the test pattern (20) are produced and the digitized partial pictures are composed to a digitized overall picture of the test pattern (20). The correction data for the control (4) for deflecting the laser beam (2) are calculated on the basis of a comparison of actual positions of the laser beam (2) on the digitized overall picture with predetermined desired coordinates.