126results about "Digital variable display" patented technology

A digital signal processing method is for enhancing fidelity of equivalent-time waveform measurements. The method includes receiving a digitized equivalent-time waveform of a repeating signal under test (SUT), applying a low-pass filter to the digitized equivalent-time waveform to obtain a smoothed waveform, generating a residual waveform by subtracting the smoothed waveform from the digitized equivalent-time waveform, estimating contributions of multiple noise sources in the residual waveform using a regression model, computing target noise and jitter values by removing known intrinsic contributions, and reconstructing a corrected waveform by combining the smoothed waveform with a scaled version of the residual waveform, wherein the scaling is based on the target noise source contributions.

The invention relates to the technical field of jitter analysis, in particular to a high-speed oscilloscope eye diagram real-time jitter detection method and system, and the method comprises the following steps: carrying out high-speed collection waveform zero-cross detection to obtain a timestamp, calculating offset grouping to obtain a cross-period edge time sequence, merging a jump cluster according to a sequence hierarchy cluster, calculating offset, obtaining a drift trend vector, and calculating the jitter of the drift trend vector; and based on the trend vector distribution compensation weight, weighting and correcting the time coordinate, calling a corrected coordinate detection period boundary to calculate a difference value exceeding a threshold value, triggering correction to obtain a period correction rear edge coordinate, and extracting a jitter frequency amplitude according to corrected coordinate Fourier analysis to generate an eye pattern jitter detection result. Phase correlation is established based on a cross-period sequence, an analyzable offset mode is formed through a clustering identification distribution structure, accumulated deviation is suppressed through a drift trend and weight correction, an abnormal period is calibrated through period dynamic discrimination, and the relation between a jitter structure and amplitude is separated through frequency analysis, so that the overall stability and integrity are enhanced.

A test and measurement device has a port to receive a signal from a device under test (DUT), one or more analog-to-digital converters (ADC) to digitize the signal to create one or more waveforms, a display, and one or more processors configured to execute code that causes the one or more processors to: generate a histogram from the waveform, the histogram having one or more dimensions; and calculate one or more entropy values for each of the one or more dimensions. A method includes receiving a signal from a device under test (DUT) at a test and measurement device, digitizing the signal using one or more analog-to-digital converters (ADC) to produce a waveform, generating a histogram from the waveform, the histogram having one or more dimensions, and calculating one or more entropy values for each of the one or more dimensions.

The invention relates to a power distribution network harmonic analysis method and system, and the method comprises the steps: constructing a digital twinborn model of a power distribution network region, and selecting transformers in the region as analysis objects one by one; for each analysis object, various working conditions are simulated by changing the transformation ratio of the analysis object in a digital twin model, and voltage and current waveforms are collected and subjected to Fourier decomposition to obtain harmonic phasors; thirdly, performing phase reduction on the phasor data, separating a real part from an imaginary part to construct a matrix, and solving a harmonic coefficient matrix by using a least square method to realize error minimization; separating linear and nonlinear parts of the harmonic current, and calculating a harmonic emission capability parameter and a harmonic current risk parameter for quantitative evaluation; according to the method, all transformers are traversed and analyzed, and systematic harmonic evaluation of the whole power distribution network area is finally realized.

A test and measurement device comprises two or more channels to enable the test and measurement device to connect to a device under test (DUT), each channel comprising an analog-to-digital converter (ADC) and one or more trigger devices, each trigger device determining one or more trigger conditions, a display to enable the test and measurement device to display data from the ADC, a user interface, and one or more processors configured to execute code to cause the one or more processors to acquire data from the two or more channels at a different time than other two or more channels in response to one or more trigger conditions.A test and measuring instrument similar to the one mentioned above, except that in addition to one or more channels with ADCs, it includes at least one channel with an auxiliary input and a threshold detector instead of an ADC.

The application discloses a digital oscilloscope variable sampling rate acquisition and storage device, which comprises a data acquisition module, an upper computer, a data preprocessing module and a data cache module. The data acquisition module acquires data and sends the data to the data preprocessing module. The upper computer sets a threshold start position, a threshold end position and a sampling rate increase multiple according to user needs, and sets parameters for the data preprocessing module and the data cache module. According to control signals of the upper computer and the data cache module, the data preprocessing module changes the data extraction multiple, thereby changing the data sampling rate, and sends the data after the extraction to the data cache module. The data cache module caches the data, and sends control signals to the data preprocessing module according to the data cache condition. The application can adopt the variable sampling rate in the same waveform data, so that the user can observe the waveform details without wasting the storage space.

The invention discloses a full-parameter automatic test system suitable for a dual three-channel RD converter. The system sets and controls a tested product and a test instrument through computer control software, and realizes automatic test of performance parameters and functions of the to-be-tested dual three-channel RD converter under different temperature conditions according to a full-parameter automatic test process set by the computer control software. And automatically recording the test data and storing the test data to form a test record table. According to the invention, the test efficiency and test coverage of the dual three-channel RD converter can be effectively improved, and the actual result shows that a single converter can complete the test of all parameters within 5 minutes and automatically form a test record. Compared with a traditional manual test, the method has better efficiency and consistency, and is suitable for batch production test of the dual three-channel RD converter.

The invention relates to the technical field of pulse trigger circuits, in particular to a transient high-frequency pulse waveform capturing method of a pulse trigger circuit, which comprises the following steps: acquiring a first sampling signal sequence and a second sampling signal sequence; determining a plurality of prediction sampling signals in a future preset time period based on the first sampling signal sequence so as to determine a prediction trigger characterization value; determining a plurality of key sampling signals in a target time period based on the second sampling signal sequence so as to determine a key trigger characterization value; judging whether a pre-trigger signal is generated or not based on the predicted trigger characterization value and the key trigger characterization value; in response to generation of the pre-trigger signal, obtaining a plurality of continuous sampling signals based on the second sampling signal sequence to determine a signal stability degree value; and determining a waveform generation mode based on a comparison result of the signal stability degree value and a preset stability degree value. The transient high-frequency pulse waveform capture false triggering rate can be reduced, and the waveform capture rate and the waveform integrity are ensured.

To improve measurement speed.SOLUTION: A test and measurement device 20 receives a signal from a device 10 under test through a probe 32. One or more processors 38 generate a waveform from the signal, apply an equalizer to the waveform, receive an input identifying one or more measurements to be made on the waveform from a user interface device 44, select the number of unit intervals (UIs) for a known data pattern, scan the waveform for the known data patterns having a length of the number of UIs, identify the known data patterns as short pattern waveforms, apply a machine learning system 46 to the short pattern waveforms to obtain a value for the one or more measurements, and supply the values of the one or more measurements for the waveform.SELECTED DRAWING: Figure 8

The invention relates to a method, a system and a probe for measuring and visualizing values of electromagnetic parameters of a PCB, wherein a probe head of the probe non-contact measures values of at least one electromagnetic parameter at at least two different locations of the PCB; a camera fixed in place relative to the probe head records an image of an area of the PCB around the probe head for each of the different locations; for each of the different locations, the measured values of the electromagnetic parameter are associated with the recorded image of the area of the PCB around the probe head; a position of each recorded image of the area on a map representation of the PCB is determined; the map representation of the PCB is overlaid with the measured values of the electromagnetic parameter, and the map representation of the PCB is visualized together with the overlaid measured values of the electromagnetic parameter.

The application discloses a digital oscilloscope frequency domain trigger method based on a direct digital integration method, a group of cosine waves of specific frequencies are generated through self-defined analysis frequency bands and frequency resolutions, then a measured signal is multiplied by the cosine waves of the specific frequencies and integrated, energy of the signal on the frequency component is directly obtained, and finally the analysis result is used for a frequency domain trigger function in the oscilloscope.

A measurement apparatus for measuring signals from a DUT includes a time domain receiver for receiving from the DUT a DUT time domain output signal in a time domain and providing a time domain input signal; a logic domain receiver for receiving from the DUT a DUT logic domain output signal including logic levels over time; an LO for generating an LO signal; a mixer for receiving from the DUT a DUT frequency domain output signal in a frequency domain and for mixing the DUT frequency domain output signal and the LO signal to provide a frequency downconverted frequency domain signal; a frequency domain receiver for receiving the frequency downconverted frequency domain signal and providing a frequency domain input signal; and a controller for determining control signals in response to the logic levels from the DUT logic domain output signal for controlling at least one operation of the LO.

The embodiment of the present disclosure provides a signal processing device, a signal processing method, an electronic device and a storage medium. The signal processing device comprises: a signal processing circuit, configured to receive a first transmission parameter of an input signal associated transmission path through an input interface; perform frequency resampling on the first transmission parameter to obtain a second transmission parameter based on a predetermined frequency parameter, and determine a first frequency response of the transmission path based on the second transmission parameter; wherein the first frequency response is associated with embedded processing or de-embedded processing of the input signal; perform conjugate symmetric processing on the first frequency response to obtain a second frequency response which is a complex conjugate symmetric of the first frequency response; perform frequency domain to time domain conversion on the second frequency response to obtain an impulse response of the transmission path; determine a filter parameter of a digital filter based on the impulse response; and the digital filter is configured to process the input signal based on the filter parameter to obtain an output signal.

The present application relates to the technical field of jitter analysis, in particular to a high-speed oscilloscope eye diagram real-time jitter detection method and system, comprising the following steps: high-speed acquisition waveform zero-crossing detection obtains timestamp calculation offset, grouping obtains cross-period edge time sequence, according to sequence hierarchical clustering merges jump cluster, calculates deviation, obtains drift trend vector, based on trend vector, assigns compensation weight, weightedly corrects time coordinate, calls corrected coordinate to detect period boundary, calculates difference, triggers correction when difference exceeds threshold, obtains period-corrected edge coordinate, and according to correction coordinate, Fourier analysis is carried out to extract jitter frequency and amplitude to generate eye diagram jitter detection result, in the present application, phase correlation is established based on cross-period sequence, and a resolvable offset mode is formed by identifying the distribution structure through clustering, the cumulative deviation is suppressed through drift trend and weight correction, the abnormal period is calibrated through period dynamic discrimination, and the jitter structure and amplitude relationship are separated through frequency analysis, so that the overall stability and integrity are strengthened.

The invention provides a high-precision eye pattern jitter analysis method for a sampling oscilloscope. The high-precision eye pattern jitter analysis method comprises the following steps: collecting a high-speed serial signal to be detected, an orthogonal sine wave signal and a data signal; performing time base correction on the orthogonal sine wave signal, and reconstructing a precise time base; carrying out jitter measurement on the high-speed serial signal to be measured by selecting an oscilloscope mode to obtain first root-mean-square jitter and first peak-to-peak value jitter, and carrying out jitter measurement on the data signal by selecting an eye pattern mode to obtain second root-mean-square jitter and second peak-to-peak value jitter; generating a high-resolution eye pattern based on the data signal and the reconstructed precise time base, and calculating eye pattern parameters based on the form of the high-resolution eye pattern; and outputting an analysis result. According to the high-precision eye pattern jitter analysis method for the sampling oscilloscope, harmonic waves can be suppressed, the purity of time sequence reference signals can be ensured, a precise time base can be reconstructed, jitter characteristics of signals of a high-speed communication system can be comprehensively reflected, quantitative evaluation of analysis results is achieved, the measurement precision is high, and the measurement mode adaptability is high.

The present disclosure provides a main measurement device (100, 300) for simultaneously measuring signals with at least one secondary measurement device (220, 320), the main measurement device (100, 300) comprising a reference signal output port (101, 222, 301) configured to couple to the at least one secondary measurement device (220, 320), a reference signal generator (102, 223) coupled to the reference signal output port (101, 222, 301) and configured to generate a reference signal (103, 224), a measurement port (105, 225) configured to receive a signal to be measured, a trigger output port (111, 311) configured to couple to a trigger input port (231, 331) of the at least one secondary measurement device (220, 320) and to output a trigger signal, and a controllably switchable internal signal path (106, 226) configured to selectively couple the reference signal generator (102, 223) with the measurement port (105, 225). Further, the present invention discloses a respective secondary measurement device, a respective measurement system, and a respective method.

Signal Processing Apparatus and Method, Digital Oscilloscope, The signal processing apparatus is configured to output one of two types of target signals based on a trigger signal and a trigger level, and includes a trigger comparison unit (100) configured to extract a low-frequency component signal of the trigger signal, a controller (200) electrically connected to the trigger comparison unit (100) and configured to generate a trigger comparison signal based on the relationship between the low-frequency component signal and the trigger signal, and output one of the target signals obtained based on the trigger comparison signal according to a preset, and a trigger display unit (500) electrically connected to the controller (200) and configured to receive the target signal and display it on a target interaction interface.

An eye margin test method includes receiving an analog input signal, receiving an analog input signal, generating a recovery clock signal based on the digital input signal, delaying the recovery clock signal by adjusting a first delay control code, obtaining a first delay margin code based on the delayed recovery clock signal, delaying the digital input signal by adjusting a second delay control code, obtaining a second delay margin code based on the delayed digital input signal, and obtaining an eye margin code by adding the first delay margin code and the second delay margin code.

The utility model relates to the technical field of circuit measurement, and provides a voltage measuring circuit, which comprises an input module, the input module is connected with a test module, the test module is connected with an output module, the input module comprises an input terminal, and at least two pins are arranged in the input terminal and are respectively used for connecting the test module and grounding. According to the device, the precision of voltage sampling is improved through an effective filtering unit in the test assembly, stable power supply is provided for an internal processor by utilizing a multiple protection unit integrated by the power supply assembly, meanwhile, damage caused by reverse voltage or abnormal high voltage is effectively prevented, the output module can stably present a measurement result, and the measurement accuracy is improved. Clear and accurate reading can be kept even in long-time operation.

The application discloses a sampling synchronization method of multiple digital oscilloscopes, which mainly comprises two steps of clock synchronization and trigger synchronization; in the clock synchronization part, a master device crystal oscillator provides a source clock and outputs a synchronization clock signal to a slave device, the slave device obtains a transmission delay time of the synchronization clock signal through an internal counter and performs phase compensation to realize sampling clock synchronization; in the trigger synchronization part, the master and slave devices set the same trigger depth, the slave device establishes a trigger system through FIFO read-write enable signals and intermediate control signals FIFO_MID generated by the master device, read-write operations of trigger data are realized, then FPGA performs delay processing on the collected data, compensates for the determinate delay of edge detection and the indeterminate delay of a transmission path, and finally, timing adjustment is performed on the slave trigger signal FIFO_MID to complete trigger synchronization; when the digital oscilloscopes connected in series complete the sampling clock synchronization and the trigger synchronization in turn, the sampling synchronization of the multiple digital oscilloscopes is finally realized.

To provide an electric leakage detection system and an electric leakage detection method applied to a circuit board including a plurality of traces.SOLUTION: The system includes a plurality of parallel switch loops, a voltage generator, a controller, and a decision device. Providing a plurality of parallel switch loops, each switch loop being disposed with a first switch, a second switch, and a probe connected to a node between the first switch and the second switch, the probe corresponding to one of the plurality of traces of the circuit board, inputting a voltage to the first switch of each of the plurality of parallel switch loops, controlling conduction of each of the first switch and the second switch of each of the plurality of parallel switch loops to generate an electrical signal between two of the plurality of traces of the circuit board, and receiving the electrical signal and determining whether the electrical signal exceeds a preset threshold.SELECTED DRAWING: Figure 2

The application discloses a testing device and testing equipment, the testing device is used in combination with an oscilloscope, comprising a base, a first test module and a second test module, the first test module comprises a signal pin and a first driving assembly, the first driving assembly drives the signal pin to move, the second test module comprises a grounding pin and a second driving assembly, the second driving assembly drives the grounding pin to move; the testing equipment comprises the above testing device. In the application, the first driving assembly drives the signal pin to pierce a point at a testing position, at the same time, the grounding pin pierces a point at a suitable position of a to-be-tested member at the side of the signal pin. Since the signal pin and the grounding pin are connected with two pole bases of the oscilloscope respectively, various electrical signals at the testing point, such as voltage, current and phase difference, are shown in the form of waveforms on the oscilloscope, so that the signal waveforms of different testing points are convenient to observe, and the analysis and research of detection data are facilitated.

The invention discloses a multi-domain parameter adaptive adjustment method for a digital oscilloscope matched with signal frequency characteristics, and the method comprises the steps: firstly sampling an unknown input signal through a high-speed data collection system, obtaining a digital parallel sampling signal, and transmitting the digital parallel sampling signal to a multi-information-domain data processing module in an FPGA (Field Programmable Gate Array); in the multi-information-domain data processing module, time-frequency graph data acquisition of unknown signals is completed based on accurate control, fast Fourier transform and data delay feedback of time-domain data required by each frame of frequency spectrum, and the time-frequency graph data is transmitted to an industrial personal computer through a high-speed interface after being acquired. The method comprises the following steps: performing data analysis, obtaining a maximum value of spectrum energy and calculating an effective frequency index value to obtain a maximum effective frequency index value and a minimum effective frequency index value, then obtaining a multi-domain analysis parameter center frequency and an analysis bandwidth through calculation, and setting, feeding back and adjusting a multi-domain analysis processing module on a user interface of a digital oscilloscope.

The present invention provides improved testing of complex devices under test, particularly parallel analysis of signals of the device under test. Multiple signals of the device under test can be acquired, and characteristic parameters of the acquired signals can be determined. The determined characteristic parameters of the multiple signals can be stored. In particular, the characteristic parameters can be stored in the form of an array, a table, or a spreadsheet.

This application provides an analog front-end chip, an analog front-end circuit, and a signal processing device, including: a first operational amplifier module for amplitude adjustment of an electrical signal connected to a first input impedance network; and a second operational amplifier module for amplitude adjustment of an electrical signal connected to a second input impedance network. The second input impedance network has a different impedance than the first input impedance network. The first and second operational amplifier modules are integrated within the same chip. This solves the problem of parasitic capacitance and resistance sensitivity caused by external chip interconnections; avoids the influence of process deviations on the bandwidth of the signal transmission path; and easily achieves high bandwidth performance for the analog front-end circuit. Simultaneously, since all critical signal paths are within a single chip, the temperature characteristics are consistent, resulting in minimal system temperature drift.

The invention discloses a waveform data display method and device, equipment and a medium. The method comprises the following steps: uniformly dividing each signal into a plurality of signal groups according to the level of each signal of a target digital circuit in a signal tree, and determining the number of the signal groups; for each signal group, storing each waveform data sequence of the signals in the signal group to a disk space matched with the data size of each waveform data sequence; storing the signal group information of each signal group to a preset storage position; and when a waveform data display request corresponding to the waveform data of the target signal at the target moment is obtained, displaying a waveform data sequence containing the waveform data of the target signal at the target moment in a target display window. According to the embodiment of the invention, based on the signal group information of each signal group, the waveform data sequence containing the waveform data of the specified signal needing to be checked by a technician at the specified moment can be quickly and accurately displayed in the window of the interaction page.

The invention relates to the technical field of power system relay protection, in particular to a secondary circuit important node maintenance state voltage monitoring method and a monitoring device, and the method comprises the steps: connecting multiple paths of voltage detection channels which are high in input impedance and isolated from one another into a secondary circuit node, synchronously collecting voltage signals, carrying out the voltage division, isolation and differential amplification, and carrying out the voltage detection; and the main control module carries out real-time analysis and dynamic threshold judgment. When voltage abnormity is detected, the device automatically triggers audible and visual alarm and starts high-precision wave recording, meanwhile, a defect feature library is called for intelligent diagnosis, and finally a comprehensive evaluation report is generated. The corresponding device comprises a multi-path voltage sampling module, a signal conditioning module, an MCU main control module, a man-machine interaction module and a power supply module. According to the invention, the multi-channel, automatic and intelligent monitoring of the maintenance state of the secondary circuit is realized, the problems that the traditional manual measurement efficiency is low and hidden defects are difficult to find in time are effectively solved, and the maintenance safety and the working efficiency are remarkably improved.

The present application discloses a waveform selection method, a waveform selection device, a device, and a storage medium. The selection method comprises: determining a click position on a display in response to a user's click action; determining a waveform selection area based on the click position; determining waveform energies of multiple channel waveforms within the waveform selection area; and selecting a target waveform from multiple channel waveforms based on the waveform energies of multiple channel waveforms.

The invention discloses an ideal waveform recovery method and device, a terminal and a medium, and the method comprises the steps: obtaining a reference cross time point data sequence corresponding to an input serial signal, and enabling the reference cross time point data sequence to comprise at least two cross points; based on high and low level voltage values corresponding to input serial signals and the cross points, traversing the reference cross time point data sequence, and determining ideal waveform data corresponding to a target search value; and determining a target ideal waveform data sequence based on the ideal waveform data. According to the method, the ideal reference waveform is recovered according to the reference cross time point data sequence obtained by actually collecting the serial signals, the recovered ideal waveform is compared with the actually collected serial signal waveform, and the signal deterioration degree caused by links and the like can be visually obtained.

A probe for use with a transcranial magnetic stimulation (TMS) device can include a coil having a first end and a second end. A first lead wire electrically coupled to the first end of the coil, and a second lead wire electrically coupled to the second end portion of the coil. The coil has a central axis and a major dimension from 2 mm to 8 mm measured perpendicularly to the central axis. The coil can have from about five to about twenty turns.