206 results about "Digital storage oscilloscope" patented technology

The simulating experiment equipment for local discharge in gas insulated combined electric appliance consists of inducing pressure regulator, no-corona experiment transformer, no-local discharge protecting resistor, standard capacity voltage divider, GIS simulating experimental device, internal UHF antenna sensor and external UHF antenna sensor, microstrip line filtering amplifier, intelligent UHF multiplexer, wide band high speed ultrahigh capacirty digital storage oscilloscope and microcomputer. The simulating experiment equipment and method for local discharge in gas insulated combined electric appliance may be used for simulating various defaults inside GIS to obtain PD experiment data reflecting various kinds of insulation defaults and distinguish the PD modes of the insulation defaults in GIS, so that the present invention may be used widely in relevant theoretical analysis and application research.

A Composite Trigger for a DSO provisionally honors a conventional hardware trigger by algorithmically investigating the content of the associated Acquisition Record for a selected signal attribute (a S / W Trigger). If found, the hardware trigger is fully honored by displaying the Acquisition Record with a previously selected time scale and with the time reference set to where in the trace the selected signal attribute occurs. The selected attribute may include the occurrence of a stated value or stated range of values for any automatic measurement upon a trace that the 'scope is otherwise equipped to perform. In addition to being based on existing automatic measurements, the Composite Trigger can also be satisfied whenever subsequent investigation determines that a segment of trace described by the Acquisition Record does or does not pass through one or more zones defined relative to an existing time reference. The Composite Trigger can also be based on whether a trace can be interpreted as exhibiting a selected serial bit pattern, or, upon whether the trace represents an edge that is not monotonic.

The invention discloses a partial discharging experiment device of a structure-variable combined electrical gas-insulated apparatus and a method thereof, and belongs to the technical field of insulation online detection of electrical equipment. The partial discharging experiment device mainly comprises a GIS simulating element, a digital storage oscillograph and a signal generator, etc. By utilizing the device, the partial discharging experiment method carries out a pressurized experiment so as to collect ultrahigh frequency PD signals, carries out a signal injecting experiment, collects and corrects the ultrahigh frequency PD signals through programs, thus obtaining real waveform of the ultrahigh frequency PD signals. The device can simulate the T-shaped, L-shaped and bar-shaped structures of real GIS equipment. The method can carry out the experiment to the T-shaped, L-shaped or bar-shaped GIS structures by one to four insulated defect models, and the experiment is real, accurate and wide in range. The device and the method can be widely applied to the experimental research of the insulated state online monitoring of GIS equipments in teaching practices, scientific research institutions and equipment manufacturing plants, and the detected PD signals can be used for theoretical analysis and applied research.

A sulfur hexafluoride gaseous discharge micro component infrared detection device and method relates to a sulfur hexafluoride gaseous infrared absorption spectrum analysis device and method. The device of the invention mainly comprises an induction voltage regulator, a corona free experimental transformer, a non local discharge protective resistor, a standard capacitance voltage divider, a GIS analogue element, a non inductive resistance, a Fourier transform infrared spectrometer and a wideband high speed super capacity digital storage oscilloscope; wherein the gas tank in the Fourier transform infrared spectrometer is a long optical distance one. The method of the invention includes that discharge micro component detection is carried out on SF6 gas sample in GIS by utilizing the device ofthe invention. The invention can accurately detect various products produced by gas discharge decomposition of SF6 and has the characteristics of high detection precision, high spectrum resolution, good absorption peak symmetry, high signal to noise ratio and the like. The invention can be widely applicable to GIS equipment online running local discharge and provides reliable data for GIS equipment online running state analysis.

The invention discloses a portable universal digital storage oscilloscope. The passive probe connects with the signal transforming conditioning circuit, analog-digital conversion ADC circuit, data path and high frequency control module, DSP processor system, data interface, and the signal transforming conditioning circuit connects with the trigger function generating circuit, data path and high frequency control module, and ADC circuit, and digital signal LCD display connects with the DSP processor system, and the signal transforming conditioning circuit, and the rechargeable battery and AC-DC power module connect with the intelligent power switch and distribution circuit, and DSP processor system. The invention uses four ADC chips to phase interleaving sampling, which increasing bandwidth, and lower cost; the external power and internal battery can automatically switch to supply power, to intelligently control the power distribution, with low power, small size, and can be used in various testing field handheld; the single machine completes the signal processing result and displaying, audio recording and storing the output, which can set up and update procedures through data interface, and it is a portable universal digital storage oscilloscope.

The invention relates to a microprocessor or computer-based digital oscilloscope and a method for manipulating and displaying waveforms in the digital oscilloscope, the digital oscilloscope and the method are characterized in that the digital oscilloscope is provided with a bar-shaped touch device (11) for waveform selection, the coordinates of two key points on the top and the bottom part of each displayed waveform on a display screen are taken as fixation points, a touch point in the bar-shaped touch device (11) is mapped in the display screen by the linear corresponding relation to obtain a mapping position along the vertical direction, and the waveform represented by the fixation points which are most close to the mapping position is selected as the current waveform. When in waveform section, the digital oscilloscope has the advantages of faster, more intuitive and more difficult in making mistakes; the method does not need the precise positioning, the waveform selection device occupies smaller space, thereby being capable of reducing the operation range and reducing the hand fatigue; the placement of the waveform selection device is more flexible, and the waveform selection device can be moved relative to the waveform display screen.

The present invention discloses a digital storage oscillograph which has a very high waveshape catching rate. A test signal is inputted and is transmitted to an ADC converting module for sampling after regulation, and is transmitted to a caching of a collecting memorizer under the controlling of triggering and time-base circuit. When a one-time waveform collection is completed, a parallel coprocessor collects data and maps to a waveshape lattice data corresponding with the lattice of the display screen, and starts a new round of collection and mapping when the mapping is completed. At the same time, a microprocessor executes the management operation, and when a timing refreshing time of the display screen is obtained, a display refreshing control logic is instantaneously activated for automatically combining the waveshape lattice data with lattice data in the display memorizer and updating the display of the display screen. The invention adopts a framework that a signal waveform collecting procession and the micro-processor operate parallelly to free the micro-process from the burdensome waveshape processing and display. The time of blind zone is reduced and the catching rate of waveshape is increased. The probability for discovering the transient abnormal signal and the test efficiency are increased.

The invention discloses a complex synchronous ultrasonic vibration micro-electrolytic machining method. A micro pressure adjustment device is used to keep the micro pressure contact of workpieces with the micro cathode; a micro displacement laser sensor is used for rapid dynamic measurement of the location of the ultrasonic vibrations, and to convert the vibrations into electrical signals carrying ultrasonic frequencies, phases and amplitudes, then the signals are transmitted to a chopper circuit for processing and conversion to produce chopping signals to turn on and shut off the electrolytic power source, thus achieving the synchronization of the electrolytic electrification and ultrasonic vibration of the cathode; a current sensor converts electrolytic signals into voltage signals, which are displayed, measured and storage by a digital storage oscillograph and then are transmitted to a control computer for automatic adjustment of the ultrasonic parameters and the electrical parameter. The method reasonably combines micro electrolysis with ultrasonic vibration in synchronization and in the same frequency, and eliminates passivation of the electrolysis through the function of ultrasonic vibration, thus improving accuracy of the machining and the quality of the surface and reducing the cost; and the invention can achieve micro machining of micro-structures of any type.

The invention discloses a single-ended active probe circuit of a digital oscilloscope, which combines high-speed signal completeness test requirements and combines an existing component based on a broadband testing principle for analyzing a single-ended active probe. Through an impedance conversion module, the requirements of the single-ended active probe in high input impedance, smallest input capacitance and small output impedance are realized; simultaneously, through an output circuit, the single-ended active probe circuit can be matched with the input impedance of 50 ohm of the oscilloscope.

The invention discloses a digital oscilloscope with an equivalent sampling function. The digital oscilloscope comprises a clock source module for generating a sampling clock signal, a triggering module for generating a triggering signal, a sampling module for receiving a measured signal and the sampling clock signal and generating a plurality of sampled data, a phase difference measuring module for generating a phase adjusting signal, and a phase adjusting module for adjusting the displayed positions of the plurality of sampled data according to the phase adjusting signal, wherein the phase difference measuring module comprises a delay chain module for receiving the triggering signal, delaying the triggering signal according to a plurality of different delay values and generating a plurality of delayed signals and a triggering output module for receiving the delayed signals and the sampling clock signal, and outputting the phase adjusting signal according to levels of the delayed signals at the triggering moment of the sampling clock signal under the triggering of the sampling clock signal. The digital oscilloscope consists of digital circuits, and cannot be influenced by factors, such as noise and the like; and the waveform fluctuation degree is low.

A system, apparatus and method for performing differential return loss measurements and other measurements as a function of frequency uses a digital storage oscilloscope (DSO) having spectral analysis functions. A waveform generator generates a differential test signal in the form of a series of pulses where each pulse includes spectral components associated with each of a plurality of frequencies of interest. A test fixture presents the differential test waveform to a load including at least one of a device under test (DUT), a short circuit, an open circuit and a balanced load. A signal acquisition device differentially measures the test waveform during each of the load conditions. The signal acquisition device computes an error correction parameter using measurements made during the short circuit, open circuit and balanced load conditions. The correction parameter tends to offset signal acquisition errors within measurements made during the DUT load condition.

A digital storage oscilloscope having a display screen to display a waveform, and a mask defining compliant and non-compliant regions. A method of operating the oscilloscope includes receiving a signal, processing the signal, and displaying the signal on the screen. Portions of signals occupying the non-compliant region are displayed with a flashing illumination. The flashing illumination may be manually invoked to reveal small and inconspicuous violations.

The invention disclosed a multifunctional tester, comprising a digital storage oscilloscope module, a digital multimeter module, a function signal generator module and a frequency meter module, which is characterized in that, the control plate of the digital storage oscilloscope is used as the motherboard of the multifunctional tester, and is provided with a multi-computer communication module and a display calculation module which are used to communicate with the data of the digital multimeter module, the function signal generator module and the frequency meter module and display the calculation. The digital multimeter module, the function signal generator module and the frequency meter module acquire the input commands of users by the communication of the motherboard, interact the output data with the motherboard, and then display the output data by the display screen. The invention has the advantages that the invention provides a multifunctional tester covering the common electronic testing devices acquired by the field monitoring which is convenient for the electronic engineers to do common tests, and sets up a testing platform which is convenient for the electronic engineers to do common tests.

This invention provides an intelligent synthesized electronic gauge. It integrates the storage oscillograph, digital frequency meter, signal generator, RLC detecting device, two-circuits stabilized voltage supply which are commonly used for electric experiment with the technology of microprocessor, EDA and flat display. It also adopts the colorful liquid crystal display (LCD) and the grade menu operation of touch screen to realize intelligent detecting. It has the merits of integrated function, an integrated unit of storage oscillograph, digital frequency meter, signal generator, RLC detecting device, two-circuits stabilized voltage supply which are commonly used for electric experiment, on-line update of the device via programmable logic device which is convenient for the production update. It also supports TFT high- resolution LCD with the technology of flush-bonding MPU providing touching screen control to make the device screen of high-definition and simple operation.

The invention provides an automatic setting method of a digital oscilloscope. The method comprises the following steps that in step S1, an analogue input signal channel at the front end is set into an AC coupling mode, the DC level in the input signal is filtered, the trigger signal level in a trigger system is set into zero level, the input signal is converted into a trigger signal in a square wave method, and the frequency of the trigger signal in the square wave method is fx; in step S2, the time base shift of the digital oscilloscope is set, and the intermediate frequency fm is set to f0 * fc, wherein, f0 is the fixed timer frequency. The fixed timer frequency f0 can satisfy that at least the input signal of one cycle is displayed on the display screen. The invention simultaneously carry out frequency measurement and amplitude measurement on the input signals of multiple paths to enhance the automatically set frequency; the method of combining and simultaneously carrying out the direct frequency measurement and the multiple-cycle measurement is adopted during automatic frequency measurement, thus the accuracy and efficiency of the frequency measurement are enhanced.

A digital oscilloscope comprises a sampling unit configured to sample an input signal received from an oscilloscope probe to produce a first stream of digital samples, a first acquisition system configured to store and process the stream of digital samples to produce a first data set, a second acquisition system configured to store and process the first stream of digital samples independent of the first acquisition system to produce a second data set, and a display system configured to concurrently display the first data set in a first format and the second data set in a second format different from the first format.

The invention relates to a method for measuring impulse grounding resistance of an electric power system, in particular to an improved method for measuring the impulse grounding resistance of the electric power system, which is used for researching the impulse characteristics of concentrated grounding electrodes with different structures. Transient stable-state impulse grounding resistance is defined as the resistance of a grounding body at the half-peak moment of impulse current. The improved method for measuring the impulse grounding resistance of the electric power system comprises the following steps: firstly, generating the impulse current by an impulse current generator and injecting the impulse current into the earth; acquiring voltages at both ends of the concentrated grounding electrodes with different structures and voltage electrodes and current at a current injection point by taking an impulse voltage divider and a current sensor as conversion devices by utilizing a digital storage oscilloscope; and processing acquired data through matrix laboratory (MATLAB) software to obtain the transient stable-state impulse grounding resistance of the grounding electrode under certain impulse current. The transition-state impulse grounding resistance disclosed by the invention is capable of actually reflecting the current dispersing capacity of the grounding body under the impulse current and is capable of actually describing the maximum potential rise of the grounding body under the amplitude of the impulse current.

The invention discloses an automatic testing system of characteristic parameters of a direct-current breaker, which consists essentially of an analyzing and managing system controlled by a computer, a digital storage oscillograph and a program-controllable direct-current power source. 12-bit digital values that are output by a single chip microcomputer output 0 to 5V voltage through a digital-to-analog converting circuit, and the voltage is output to a phase-shifting-control full-bridge zero-voltage switching and a pulse modulation converting circuit through an isolating amplifier as well as to an EA+ end of a main chip, thus changing output current. The electromagnetic tripping action time is measured by a waveform breaking method and taking the largest constant short-circuit current in electromagnetic instantaneous acting tripping as the starting point of timing, thus having the advantages of high accuracy, efficiency and reliability.

A frequency hopping pattern of a frequency hopping signal is detected by use of spectrogram-generating software in a digital storage oscilloscope. By using a spectrogram, a hopping pattern can be determined without having to demodulate the signal, recover the phase or frequency of the carrier, determine optimal sample timing, or determine system timing. A block of data that contains at least one repetition of the hopping pattern in analyzed with respect to known hopping patterns as well as with respect to the duration in time of the relevant symbols of that data.

The invention discloses a bandwidth compensating device of a channel of a digital oscilloscope, which comprises a frequency-amplitude characteristic channel compensating filter of which the frequency response is reciprocal with that of an input channel and which compensates for the frequency response for waveform data output by a high-speed analogue-to-digital converter and then outputs the waveform data, and a low pass filter designed according to indexes required by a needed channel for performing secondary filtration of the waveform data after the frequency response compensation and compensating for the input channel response to form an ideal channel response to correct the frequency response of the input channel to increase the bandwidth of the channel. The bandwidth compensating device of the channel of the digital oscilloscope compensates for the frequency of the digital waveform data after digital-to-analogue conversion of the input channel, so the bandwidth compensating device does not introduce signal overswing when compensating for the digital oscilloscope channel.

The invention discloses a dual time base digital storage oscilloscope comprising a microprocessor, an ADC conversion module, a master time base programmable data check point controller and a slave time base programmable data check point controller; an acquisition controller and a trigger event management controller generate writeable signals and readable signals with lower or higher frequency, the storage of a master time base waveform data memory and a slave time base waveform data memory is controlled, waveform data with lower or higher sampling rate can be obtained, the waveform data is displayed in a window by the processing of the microprocessor after the completion of the master and the slave time base waveform data acquisition; in addition, the dual time base digital storage oscilloscope further comprises a trigger module, the trigger event management controller and a gate circuit for generating the master and the slave trigger signals and controlling the data acquisition. The dual time base digital storage oscilloscope combines the check point controller and the memory, the dual time base waveform data acquisition is realized through the control of the reading and the writing modes of the controller without the need of an independent data extractor, the circuit is relatively simple and the cost is low.

The invention relates to a digital oscilloscope and a data processing method thereof. The digital oscilloscope comprises a data acquisition module, a data processing module, a memory module, a local video memory and a display module; the data processing module is used for temporarily storing the digital signal output by the data acquisition module in the memory module, judging whether the data volume temporarily stored by the memory module equals to a preset value, reading the temporarily stored data from the memory module and carrying out waveform processing when the data volume temporarily stored by the memory module equals to the preset value, reading waveform data from the local video memory and controlling the display module to display the waveform. The data processing method of the digital oscilloscope comprises the following steps: S1, acquiring data; S2, temporarily storing data; S3, judging whether the temporarily stored data volume equals to the preset value, if yes, executing S4, otherwise, executing S1; S4, reading the temporarily stored data and carrying out waveform processing; and S5, displaying waveform. The digital oscilloscope and the data processing method thereof improve waveform refresh rate.

A method is provided for characterizing emulsion stability to evaluate suitability of the emulsion for use as a drilling fluid in drilling subterranean boreholes. The method provides a supplement or alternative to the standard method of determining Electrical Stability of the emulsion. In the method of the invention, Breakdown Energy is calculated. Breakdown Energy can be measured at the same test point as Electrical Stability. A digital storage oscilloscope and a computer are used in addition to an electrical stability meter.

The calibration method for frequency bandwidth of digital oscillograph is to use the oscillograph prover controlled by computer to set and calibrate the digital oscillograph. The two parameters of oscillograph prover signal: f and Uf are input into the input ends of every channel in calibrated digital oscillograph. When the f is 50kHz, the frequency is keep out and Uf is adjusted finely to make the digital oscillograph display 6 grids of waveform and corresponding to the Uf0 -3dB; the frequency is near the modeling frequency bandwidth field and keep the amplitude to adjust the frequency value, while every changing the frequency value, the oscillograph will detect the present amplitude. After many comparing, the amplitude of digital oscillograph is Uf0.

The invention relates to a device for detecting instantaneous strong electromagnetic pulse. The device comprises an instantaneous strong electromagnetic pulse detecting probe, an instantaneous strong electromagnetic pulse detecting host machine and a digital memory oscillograph. Wherein the instantaneous strong electromagnetic pulse detecting probe includes antenna and a full screening probe box which is equipped with a resistance varying circuit, a tracking circuit and a electricity-photo converting circuit; the instantaneous strong electromagnetic pulse detecting host machine includes a photo-electricity converting circuit, a signal processing circuit; the instantaneous strong electromagnetic pulse detecting host machine and the instantaneous strong electromagnetic pulse detecting probe are connected via fiber; the output end of the instantaneous strong electromagnetic pulse detecting host machine is connected with the digital memory oscillograph.

The invention discloses a waveform three-dimensional imaging method. The compression depth H is obtained according to the horizontally compressed waveform length obtained through the set widening ratio, every H sampling points are compressed on one time point, and the occurrence number of the amplitude value of the H sampling points on the time point is superposed, so the probability that the H sampling points are in different amplitude values on the time point is obtained, and the time-amplitude two-dimension sampling information is mapped into time-amplitude-amplitude occurrence probability three-dimensional data, wherein the color shades is adopted for representing the amplitude occurrence probability value. When the waveform three-dimensional imaging method is adopted, the waveform three-dimensional imaging can be realized in the traditional serial architecture DSO (digital storage oscilloscope), the information loss caused by snapshot sampling processing is avoided, and the trapping capacity of low repeated signals and random signals is improved.

The invention discloses a digital storage oscilloscope with a function of time base fine tuning, which comprises a high-speed ADC, a data storage device, a processor and a programmable data real-time extraction module, wherein the high-speed ADC outputs acquisition data to the programmable data real-time extraction module to perform real-time extraction, and the extraction proportion is set according to extraction proportion control words from the processor; the acquisition data after the real-time extraction is sent into the data storage device for storage; and the extraction proportion control words are determined by the fine tuning of time base shifts as required. The digital storage oscilloscope adopts a method for performing the real-time extraction on the acquisition data by using the programmable data real-time extraction module so as to change the sampling rate of an acquisition system. In the digital storage oscilloscope, the extraction proportion can be changed by only changing the extraction proportion control words of the programmable data real-time extraction module by the processor, more and more intensive sampling rates can be generated, and particularly slow time base shifts can be generated, so the function of the time base fine tuning of the digital storage oscilloscope is achieved.

The present disclosure provides an acquisition system for oscilloscopes having n input channels. The acquisition system comprises n A / D converters (2.1, 2.2, . . . , 2.n) with each of the n A / D converters receiving a signal under test from one of n channels and digitizing the received signal into digital samples; an acquisition memory for storing the digitized samples from the n A / D converters; and a memory allocation processor for dynamically allocating memory lengths (or memory depths) for the selected n input channels within an acquisition memory based on the user setting from the oscilloscope. To efficiently use the acquisition memory, the acquisition system does not allocate any memory areas for the input channels that are not selected. In addition, the acquisition system can set up sampling rates for the n input channels based on the frequencies of the signals under test received from the n input channels.

The invention discloses an FPGA-based multiprocessor digital storage oscilloscope. The FPGA-based multiprocessor digital storage oscilloscope can effectively increase overall measuring efficiency, reduces ''dead time'', increases waveform capture rate, and accelerates debugging speed of faults in a circuit. The FPGA-based multiprocessor digital storage oscilloscope comprises a signal conditioning and triggering module, a parallel waveform acquisition module, a waveform co-processing module, a core processor and a display module. The structural features of the FPGA-based multiprocessor digital storage oscilloscope are that: the signal conditioning and triggering module comprises an amplifier, an A / D acquisition device and a triggered time base; the parallel waveform acquisition module comprises a first path sampling processor, a second path sampling processor and FIFOs connected with the processors, and sends signals output by the FIFOs to the core processor; and the display module comprises a waveform display memory, a display processor, a video memory and a display, and the waveform co-processing module is connected with the waveform display memory.