210results about "Digital variable display" patented technology

A test and measurement device has an input port to receive a signal from a device under test (DUT), the signal having a symbol rate, one or more analog-to-digital converters (ADC) to convert the signal to waveform samples at a sampling rate, and one or more processors, when aliasing is present: up-sample a portion of the signal having aliased samples to produce up-sampled samples; use the up-sampled samples to produce a real-time waveform; perform clock recovery on the real-time waveform to produce a recovered clock; and resample the aliased samples to produce a non-aliased waveform.

The invention provides a frequency converter embedded current waveform analysis method and system and a medium, and relates to the technical field of current waveform analysis, and the method comprises the steps: obtaining a sampling circuit configured in a current path of a frequency converter; calculating the required total gain based on the original output voltage signal of the sampling resistor and the required input voltage of the analog-to-digital converter; the signal quality of the original output voltage signal is evaluated, the required total gain is dynamically distributed to an instrument amplifier and a programmable gain amplifier, the original output voltage signal is amplified and then passes through an analog-to-digital converter, and current waveform data is obtained for current anomaly analysis; when the signal quality is lower than a first threshold value, the gain share of the instrument amplifier is increased preferentially; when the signal quality is higher than a second threshold, the gain share of the programmable gain amplifier is increased preferentially. According to the invention, the technical problem of low accuracy of current waveform analysis in the prior art can be solved, and the technical effect of improving the accuracy of waveform analysis is achieved.

The invention belongs to the technical field of lightning current monitoring, and particularly discloses an intelligent lightning arrester capable of monitoring lightning current and a monitoring method, which have the beneficial effects that localized operation calculation is performed through a rule engine, the diagnosis time consumption can be reduced, sampling can be quickly triggered through a dynamic threshold value, communication is performed through a dual-mode communication module, and the intelligent lightning arrester capable of monitoring the lightning current can be used for monitoring the lightning current. Therefore, timely data detection and real-time alarm can be realized, the characteristic extraction unit is used for extracting peak current Ip, wavefront time Tf, wave tail time Tt and oscillation index Oi to realize full coverage of waveform characteristics, and the life evaluation unit is used for calculating accumulated damage and residual life percentage of the equipment to realize full coverage of the waveform characteristics. The trigger threshold value of the current is calculated through the threshold value calculation formula according to the environment temperature and the relative humidity detected by the temperature and humidity sensor, accurate monitoring is achieved, and the situation of false alarm is avoided.

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 discloses a power supply detection device and a test method thereof, particularly relates to the field of power electronic control, and is used for solving the problems of high-frequency phase distortion and incapability of reflecting a stability boundary under a real load dynamic state in an open-loop state caused by introduction of additional impedance due to disconnection of a loop in an existing open-loop injection test method. A switching node voltage ripple signal is synchronously collected as a disturbance input signal and an output voltage feedback signal is synchronously collected as a response output signal in a power supply closed-loop state; performing time domain alignment on the two signals to generate a time correlation signal pair; fourier transform is carried out on the signal pair to extract open-loop transfer function characteristics; mapping the characteristics to an intersection phase angle of a Nyquist plane identification curve and a unit circle; generating a chaos distortion index based on the local curvature change characteristics of the Nyquist curve of the intersection neighborhood; and correcting the phase angle of the intersection point by using a chaotic distortion index, and outputting a loop stability evaluation conclusion according to a correction result, thereby realizing high-precision stability evaluation of uninterrupted closed-loop control.

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.

The invention relates to a method for acquiring on-site observed quantity by an oscillographic device and the oscillographic device, and belongs to the technical field of oscilloscopes. The method specifically comprises the steps that field equipment is used for collecting field observed quantity, the collected field observed quantity is transmitted to an oscillographic device through a communication interface of the field equipment, and when the field observed quantity is analog quantity, the analog quantity is transmitted to the oscillographic device after being subjected to sampling conditioning and analog-to-digital conversion of the field equipment; dozens or even hundreds of conditioning circuits and analog-to-digital conversion circuits do not need to be additionally configured, so that the analog quantity acquisition cost of the oscillographic device is reduced, and the debugging cost of field equipment is further reduced; meanwhile, digital quantity parameters such as control parameters in the field observed quantity collected by the field equipment can be directly transmitted to the oscillographic device through a communication interface of the field equipment, so that the oscilloscope can collect analog quantity and also can collect digital quantity, and the debugging efficiency of the field equipment is improved.

The utility model discloses a shielding device for electrical calibration, which belongs to the field of electrical calibration and comprises a movable box body, a cavity is arranged on the upper surface of the movable box body, an electrical shielding tube interface is fixedly mounted on the front surface of the movable box body, a through hole is arranged on one side of the electrical shielding tube interface, and a through hole is formed in the other side of the electrical shielding tube interface. A through hole in one side of the electric shielding pipe connector penetrates into the movable box body, a cover plate is connected to the upper surface of the movable box body in a penetrating mode, an inserting part is arranged on one side of the lower surface of the cover plate, a finger-shaped part is arranged on the other side of the lower surface of the cover plate and is of an arc-shaped structure, and the lower surface of the inserting part is connected to the inner side wall of the movable box body in a penetrating mode. The cover plate is stably and fixedly installed on the surface of the movable box body through the two acting points, a stable, reliable and convenient-to-disassemble structure is constructed, a continuous and stable protection environment is provided for precise elements in the box body, the risk of equipment failures caused by environmental factors is greatly reduced, daily protection requirements are met, and emergency maintenance convenience is achieved.

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 device for testing a voltage level in an electrical terminal cavity including a testing body and a probe for contacting the electrical terminal cavity. The probe includes a tip portion having a first cross-sectional area, a base portion having a second cross-sectional area, and an intermediate portion extending from the tip portion to the base portion having a third cross-sectional area. The first cross-sectional area is smaller than the third cross-sectional area, the third cross-sectional area is smaller than the second cross-sectional area, and the intermediate portion is concentric with the tip portion and the base portion. An axis extends between a center of the tip portion, a center of the intermediate portion, a center of the base portion, and a center of the testing body. The device also includes a circuit operatively coupled with the probe to sense the voltage level in the electrical terminal cavity.

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 discloses an adaptive vertical resolution enhancement method based on a digital oscilloscope, and the method comprises the steps: constructing a coefficient table composed of different types of prototype low-pass filter coefficients and corresponding different enhancement resolution digits and index values through designing different types of low-pass filter time domain coefficients; then sampling input data in real time, estimating an index value and a frequency shift point number of a resolution enhancement digit corresponding to a sampling signal through a library function in an upper computer, calling a corresponding prototype low-pass filter coefficient from a coefficient table according to the index value, issuing the prototype low-pass filter coefficient to the FPGA, and then generating a target band-pass filter in the FPGA by combining the frequency shift point number; and finally, performing frequency domain filtering to obtain an output signal after adaptive resolution enhancement so as to realize resolution enhancement.

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 belongs to the technical field of high-speed data testing, and discloses a high-speed signal eye pattern testing method and system based on automatic testing equipment, and the method comprises the steps that a high-speed signal configuration vector is divided into a configuration section and an action section, the configuration section is used for rapidly configuring a testing environment, and the action section is used for controlling a testing action; in the action section, constructing a virtual clock as a reference Trigger signal, and synchronizing the virtual clock and a high-speed signal to be detected to the same sequence group; performing waveform capture on the synchronized high-speed signal to be detected, and generating a two-dimensional array formed by sampling time and level values; the two-dimensional array is processed by a difference peak-valley segmentation method, the eye height, the rising / falling time and the jitter are measured based on a processing result, automatic control, measurement and output of test data can be realized through testing of automatic test equipment, data analysis and processing are facilitated, the test efficiency is improved, and interference of human factors is avoided.

The present invention relates to a method, device, and system for monitoring a fault current. A method according to an embodiment of the present invention comprises the steps in which: a fault detection device determines whether an overcurrent occurs in each line for a reference time period, on the basis of a sensing signal for each AC current flowing through a plurality of lines of a power system; and when an overcurrent occurs, the fault detection device separately stores, in a memory, data on a type of an overcurrent line and current data for the overcurrent among current data that is data on an AC current waveform according to the sensing signal.

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.