CN101013142A - Portable universal digital storage oscillograph - Google Patents
Portable universal digital storage oscillograph Download PDFInfo
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Abstract
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.
Description
Technical field
The present invention relates to a kind of oscillograph, relate in particular to a kind of portable universal digital storage oscillograph.
Background technology
Scientific technological advance impels hi-tech industry to emerge rapidly, has created high commercial value and huge economic benefit, and the scientific and technological content in the product is more and more higher.The scientific instrument of various discriminatings and test usefulness also are one of condition precedents that ensures national sustainable development.
Oscillograph is basic, the most general and the most primary electronic device in current electronic measuring instrument, and application industry and scope are very extensive; Oscillograph can be observed the instantaneous voltage with respect to the time, but but parameters such as shape of its display waveform and survey frequency and phase place.Oscillograph is technology-intensive, knowledge-intensive products, it is one of instrument the most general in the electronic measuring instrument, be the pacing items and the means of all electronic product scientific researches, production, test, maintenance, because diversity, suitability and the necessity of its purposes, be widely used in wide electronics and electric measurement field, such as electric power, electronics, the manufacturing, material and structure, building, space flight and aviation, biomedicine, national defense industry etc., be the supporting and indispensable important component parts of economic construction of many Important Project.Especially observe the place of the waveform of circuit voltage, electric current and debugging, analysis, decision circuitry fault at needs, oscillograph generally is indispensable; Oscillograph and some suitable cooperations such as sensor can also be observed the variation of some non electrical quantities.
The oscillograph of Cun Zaiing in the market, generally target localization on the competitive edge of the high-performance of product and power, cause the simulation on the market and the digital oscilloscope price general charged is high, volume is bigger and a lot of specialized function is very practical.Oscillograph more cheap, faster, more convenient use becomes the main flow of current market sale, and the field engineer need verify and solve increasing high complexity problem by having various functions, convenient and practical, small and exquisite testing tool of whipping.As everyone knows, oscillograph is the important tool of testing at the scene, does not have which slip-stick artist to be ready lifting an oscillograph and a pile power supply to on-the-spot, so the portable digital storage oscilloscope that can observe complicated dynamic waveform just arises at the historic moment; In addition, though the less high-end hand-held instrument of some volumes has been arranged abroad, price is high, is unfavorable for promoting.
Summary of the invention
The objective of the invention is to overcome the above-mentioned shortcoming and defect that existing oscillograph exists, a kind of portable universal digital storage oscillograph is provided.
Portable universal digital storage oscillograph: passive probe and signal transformation modulate circuit, analog to digital conversion adc circuit, data channel and high frequency control module, dsp processor system, data-interface join, the signal transformation modulate circuit produces circuit, data channel and high frequency control module, analog to digital conversion adc circuit with the triggering function and joins, the digital signal LCD display is joined with dsp processor system, signal transformation modulate circuit, and chargeable battery, AC-DC power module and intelligent power switch and distribute control circuit, dsp processor system to join.
The beneficial effect that the present invention has:
The present invention is all electronic circuit technology designs on functional circuit, adopt the mechanical devices that separates hardly, have dwindled volume greatly; Adopt the ADC chip of 4 economical and efficients that same signal is carried out high-speed sampling, cost is low, power consumption is little; Fpga chip can be finished complicated data logical process function, and the double-nuclear DSP chip ADSP561 that has the high-speed parallel data port has powerful system's control and digital signal processing function, has strengthened system's control and signal handling capacity greatly; The various data communication interfaces of apparatus preparation also can be made damascene structures, are configured on the various large-scale measuring systems, can realize the intelligence instrument combination of flexible configuration with lower cost, smaller volume.
Realized the function of automatic switchover power supply between AC-DC power module and the internal battery, unit is finished sampling and digital signal processing work, having easily, data recording, data indicate (eigenwert and audio frequency etc.) and data storage function, data communication interface is many, is particularly suitable for on-the-spot test and equipment debugging; This oscillograph volume is little, in light weight, be convenient to carry conveniently, and all occasions of measuring, debugging and overhauling of needing can conveniently be used.
Because this oscillograph is often manipulated conveniently, on structure and layout, make every effort to compact, each is formed the module strictness tests and analyzes to avoid various careless mistakes and to disturb and damage, Safety Design is also paid the utmost attention to, and implemented system radiating analysis and design, measurement performance has obtained reliable checking and guarantee.
The present invention has realized the oscillographic 26S Proteasome Structure and Function of similar typical case, and has the very high ratio of performance to price, be adapted to contemporary science and technology especially and develop the measurement demand that deepens constantly " more Gao Gengxin is faster " that proposed with scientific research rapidly, therefore have good market outlook.
Description of drawings
Fig. 1 is oscillographic basic structure schematic diagram;
Fig. 2 is the portable universal digital storage oscillograph circuit block diagram;
Fig. 3 is a signal transformation modulate circuit block diagram of the present invention;
Fig. 4 is multi-path attenuator circuit figure of the present invention;
Fig. 5 is that trigger pip of the present invention produces circuit block diagram;
Fig. 6 is an analog to digital conversion adc circuit block diagram of the present invention;
Fig. 7 is the logic function schematic diagram of data channel of the present invention and high frequency control module;
Fig. 8 is the circuit block diagram of data channel of the present invention and high frequency control module;
Fig. 9 is the logical circuitry of trigger pip logic processing module of the present invention;
Figure 10 is the logical circuitry of data buffering processing logic module of the present invention;
Figure 11 is a dsp processor systemic-function circuit block diagram of the present invention;
Figure 12 is that intelligent power of the present invention switches and the distributor circuit block diagram;
Figure 13 is a double loop power supply control switching circuit block diagram of the present invention;
Figure l4 is sampling of the present invention and data processing flow graph;
Figure l5 is a software flow pattern of the present invention.
Embodiment
General purpose oscialloscope relies on high input impedance to show and the measuring-signal waveform, as its name suggests, it not only is suitable for observing the electronic signal of a certain particular category, but can observe and a kind of device of measuring from direct current to the digital and analog signaling that exchanges, has certain big voltage amplitude according to certain mode.In order to realize these targets, the oscilloscope design complexity of Cun Zaiing, exhaustive in the market, and from a structural point, generally to adopt some mechano-electronic class controls and regulate parts, volume is huge relatively, also have problems such as power consumption and interference, all causes the popularization that is difficult to emerge of low cost, convenient practical, small and exquisite testing tool of whipping.Therefore, the present invention has changed the mentality of designing of traditional oscillograph, realized the low power dissipation design of general purpose oscialloscope, innovated a kind of circuit function of the power supply of can between AC-DC power module and internal battery, automaticallying switch, be convenient to various indoor, outdoor measurements and use; It mainly adopts modern integrated circuit to constitute each chief component of instrument, signal measurement feature at general purpose oscialloscope, dexterous modelled signal conversion and modulate circuit, cooperate circuit compensation and safe handling technology, under the prerequisite of guaranteed performance index, develop low cost, volume is little and lightweight general digital storage oscilloscope.
As Fig. 1, shown in 2, the annexation of portable universal digital storage oscillograph internal module is: passive probe 1 and signal transformation modulate circuit 2, analog to digital conversion adc circuit 3, data channel and high frequency control module 5, dsp processor system 6, data-interface 8 joins, signal transformation modulate circuit 2 produces circuit 4 with the triggering function, data channel and high frequency control module 5, analog to digital conversion adc circuit 3 joins, digital signal LCD display 7 and dsp processor system 6, signal transformation modulate circuit 2 joins, chargeable battery 11, AC-DC power module 10 switches and distributor circuit 9 with intelligent power, dsp processor system 6 joins.
The present invention the same with other universal digital storage oscillographs on design concept (as Fig. 1), the translation circuit of oscillograph input signal is made of mimic channel and digital circuit mixing, under the system operating state parameter control, finish signal transformation and conditioning, and be input to analog/digital converter (ADC) so that these momentary signals are sampled and digital quantization.A large amount of sampled data at a high speed will be stored the DSP storer by logic gate buffer, and the waveform that the data that the waveform that oscillograph LCD shows is always collected are rebuild not is a waveform input signal immediately, continuous.Therefore, a sampling data passageway and a high frequency control module (as Fig. 7,8) have been designed especially based on fpga logic according to the instant work of trigger message, the complete collection of sampled data before and after guaranteeing to trigger by cache control logic meets the principle of work and power and the essential characteristic of digital storage oscilloscope; The processing of signal data, conversion and expressive function thereof are finished on the double-nuclear DSP chip, show the signal waveform under certain trigger condition, in real time various information are extracted effectively, set up high-level data processing widely, analyze storehouse and tool storage room (for example signal data analysis of spectrum, fast fourier transform, digital filtering, process of convolution, related function processing, infinitesimal analysis, regretional analysis, numerical operation, time and frequency domain analysis etc.); Abundant outbound data communication interface configuration also is beneficial to instrument and develops into a kind of device that can set up very complicated Auto-Test System, has expanded its application aspect system testing and data management better.
As shown in Figure 2, take formula universal digital storage oscillograph input signal source one by one by passive probe, signal transformation modulate circuit, analog to digital conversion adc circuit, data channel and high frequency control module, dsp processor system and digital signal LCD display, these electronic circuit modules are electrically connected successively forms a whole set of signal Processing and display instrument; Signal transformation modulate circuit signal or external trigger signal are through after triggering the conversion of function generation circuit, the pulse that generation can be processed into the circulating sampling trigger pip for data channel and the high frequency control module based on FPGA, instrument is controlled the data acquisition action of analog to digital conversion adc circuit again by data channel and high frequency control module, sampled data is buffered to dsp processor, handles through DSP and revert to original signal and be presented on the LCD, perhaps export by data-interface.Oscillograph of the present invention is equipped with optionally signal source probe 1 of series, the safety of guarantee to be linked into oscillographic height, pressing signal and various current signals; Functional module 2 is signal transformation and the modulate circuits that carry out specification handles to measured signal; Module 3 transforms sample quantization unit---the analog to digital conversion adc circuit that the ADC chip is formed by array mould/number, each the conditioning after the channel signal source all respectively gating be linked in 4 road ADC sampling thiefs, they carry out interlaced sampling mutually according to the frequency doubling clock that differs 90 or 45 degree, synthesize continuous sampled data in the data flow logic processing module; The signal source of triggering function generation circuit 4 comprises the outer triggering signal source and through the channel signal source after the characteristic conversion process, is strobed into the trigger pip (not all signal of module 3 that is connected to is all as the triggering source) that needs take place the triggering for generating circuit according to parameter is set; Module 5 is to have data channel and the high frequency control module that pivot function is coordinated at the center in this oscillograph, adopt the high-performance fpga chip of Altera, finish by the hardware design language programmed, the data channel that is mainly used to finish the multipath high-speed data is with buffer memory work and control flow process and the state that sampled data is communicated by letter to DSP, finish some data logical process algorithms simultaneously, as shown in Figure 8, the trigger pulse that triggers the output of function generation circuit also is delivered to this module and handles, formation impels the triggering signal on opportunity of data sampling do action, and this module the ADC array chip also will take place carries out needed time clock of data sampling and control signal; Dsp processor system 6 is mainly used to the platform of construction system operation control, dsp processor adopts the BLACKFIN family chip ADSP561 of ADI company, this chip is the DSP device with super digital signal processing and Media Stream processing power, inside is furnished with 2 DSP nuclears, can the dynamic adjustments power consumption, being fit to product of the present invention uses, this system receives data channel and the next sampled data of high frequency control module buffering by one of them PPI interface in the dsp processor chip, through being reduced into original signal after the interpolation operation processing, and by another one PPI interface display waveform and metrical information on digital signal LCD, so far, the processing of whole data-signal and flow for displaying are finished substantially and are finished; The dsp processor system also comprises other design function modules as system operation control platform, as shown in figure 11, the relevant I/O circuit of dsp processor operation control can control signal conversion modulate circuit on-off circuit, some of switching of control intelligent power and distributor circuit enable and switch motion, accept various buttons and push-botton operation order, comprise also that wherein oscillographs such as storage of real-time clock, CF card and audio recording and reproducing use new function; Data-interface 8 is designated lanes of system's high amount of traffic output and input, comprise that USB2.0, UART, Ethernet interface and 1394 live wires etc. are to adapt to the application of different field, but the present invention takes the multiclass communication interface optionally can topology expansion design thinking, like this, the user can select wherein one or more data communication mouths as required.
Because this oscillograph can adopt the use of powering of the battery of limited power, in the entire circuit design, consider the various strict demands of oscillograph universal telecommunication measurement function and aspect of performance, the concrete function design of binding signal conversion modulate circuit, reduce the power consumption of each device and active driving link in the translation circuit as far as possible, fully analyze ADC, the electricity consumption standard of function circuit such as FPGA and DSP, form intelligent power control and management technical scheme, therefore the direct current DC-DC translation circuits at different levels that adopt and design are all divided in function, performance, conversion efficiency, tightly design on control effect and the economic rationality, guaranteed the general purpose oscialloscope function and the superperformance of 6 watts of power consumptions.As shown in Figure 2, the present invention has designed AC-DC power module and internal battery can the automatically switch power conversion and the control device of power supply especially according to above-mentioned requirements and feature, concentrated reflection is that a cover intelligent power switches and distributor circuit 9, comprises that also the AC-DC power module of standard and 7.2 V Li-ion batteries constitute whole distribution system in the lump; The core control section of power conversion and control device---intelligent power switches and distributor circuit, but mainly be made up of lithium cell charging and testing circuit, double loop power supply switching and control circuit conserver power source switches set, low-tension supply DC-DC conversion chipset, they are connected to each power consumption equipment and link by distribution network; These power supply controls efficiently and translation circuit are under the execution control signal effect that dsp processor takes place, the power supply that strict proportional distribution battery or AC-AC come between described each power unit of oscillograph, equipment and link, reach system's super low-power consumption design object, product structure simple layout compactness makes instrument of the present invention be applicable to the portable application of various on-the-spot test more.
As Fig. 3; shown in 4; signal transformation modulate circuit 2 is: external signal inserts holding circuit and hyperchannel attenuator circuit; signal conversion circuit; the echo signal switching switch circuit; internal signal protection and compensating circuit; buffer circuits; the trigger pip gating circuit; the AD8564 interface circuit joins; trigger pip gating circuit and gating signal distributor circuit; the AD9288 interface circuit is electrically connected; carry out the control signal interface and connect the dsp processor system, act on the gating signal distributor circuit; the trigger pip gating circuit; echo signal switching switch circuit and signal conversion circuit.
Described signal conversion circuit is electrically connected mutually and is formed by ac-coupled circuit, DC coupling circuit, HF reject circuit, low-pass filter circuit, bandwidth-limited circuit, trigger pip selection circuit.
Outside source is input to oscillograph Q9 connector through probe, enters the preceding elder generation of inner transformation circuit and forms the primary circuit protection by a suitable overvoltage su re or of frequency characteristic.Connect the hyperchannel attenuator circuit then one by one; signal conversion circuit; the echo signal switching switch circuit; internal signal protection and compensating circuit; because the high-voltage signal that oscillograph may insert can produce the overvoltage infringement to the device work of back; even circuit takes place, and overvoltage or higher gradient are pressed to cash and are resembled a little; because the non-linear of circuit impedance characteristic must cause the non-linear of back buffer circuits (current feedback integrated operational amplifier AD8001) potential change; the authenticity of infringement measured signal; at echo signal frequency content complexity; the characteristics that voltage amplitude variation is big, oscillograph have designed a cover safe and reliable attenuation transform and switch protection circuit conscientiously especially.As shown in Figure 4, adopt in the circuit design and separate parallel attenuator circuit, rather than traditional multichannel resistance cascade bleeder circuit, so as not to being difficult to search suitable build-out resistor and electric capacity; 1,2,3,4 road deamplifications are extracted out in the middle of 2 grades of different divider resistances respectively, rather than draw between cascade bleeder circuit R1, R2, R3 and the R4 above from Fig. 4, such circuit is difficult to accomplish voltage amplitude is carried out good impedance match and signal compensation than broad and the long signal of frequency band, very difficult assurance is all undistorted, also be difficult to guarantee to insert the accuracy of resistance, the electric capacity of plural serial stage has maximum overvoltage potential safety hazard especially.On-off circuit is selected the small size relay of PANASONIC, can resist high voltage impacts, responsiveness is also very fast, first order direct circuit only connects several ohm resistance as voltage stabilizing current limliting and circuit compensation device like this, second level circuit is realized the tenth of the point pressure by 2 grades of capacitance-resistance attenuator circuits, tertiary circuit is realized one of the percentage dividing potential drop by 2 grades of capacitance-resistance attenuator circuits, fourth stage circuit is realized the per mille dividing potential drop by 2 grades of capacitance-resistance attenuator circuits, comes the suitable circuit signal of gating rank---the design concept that the echo signal switching switch circuit comes to this by relay switch then; Internal signal protection and compensating circuit comprise bilateral diode holding circuit and high frequency compensation two parts, select and coupling according to concrete circuit characteristic in design and debugging.Oscillographic input impedance wants standardized designs in 1M ohm (error range about in the of 2%), so this circuit adopts the attenuator circuit of the about 3M ohm of three covers to realize three grades of dividing potential drops, otherwise, if adopt traditional dividing potential drop attenuator circuit, the attenuation level of series connection is too many, though designed building-out capacitors such as C1, C2, C3 and C4 in the circuit, is unfavorable for also reliably guaranteeing that the undistorted of complicated radio-frequency component passes through in the signal, and, be easy to cause the electric capacity punch-through.Like this, system just can specific aim select the signal below 10 volts to lead directly to the connection buffer circuits, even the overvoltage phenomenon is arranged, only otherwise the infringement attenuator circuit, also can be by the diode circuit release of on-off circuit back, satisfy general purpose oscialloscope and can directly import, measure higher piezoelectricity, particularly had the measurement demand of the higher piezoelectricity of many uncertain radio-frequency components.
The trigger pip gating circuit is exactly the MUX AD8184 under dsp processor control, forms the on-off circuit of conversion process signals such as gating signal interchange, DC coupling.Buffer circuits is a buffering device of finishing impedance conversion, adopts the current feedback chip AD8001 with good high frequency performance, has characteristics such as low noise, high Slew Rate.The gating signal distributor circuit is high speed, the high resistant buffering input four-way MUX under dsp processor control, is used for program control gating to be fit to one road signal of ADC sampling input standard, becomes to deliver to sampling thief AD9288 simulating signal and quantize interface.In the circuit, also designing datum and the pulse signal that has system self-calibration to use, to realize the program control and manual calibration function of circuit error, is general oscillograph circuit design standard, does not reflect in the drawings.
As shown in Figure 5, trigger function and produce the signal that circuit 4 receives the output of trigger pip gating circuit, inserting terminal by the trigger pulse of signal Processing and translation circuit, comparator array AD8564, data channel and high frequency control module 5 is connected and forms, the DAC of dsp processor system interface control ratio is than level generating circuit (DAC) and be connected to comparator array AD8564 as the reference level, and the external trigger signal is communicated to comparator array AD8564 in order to produce a kind of trigger pulse through the external trigger signal conversion circuit.
This oscillograph triggers function generation circuit and comprises comparative level and parts such as comparer, trigger pip processing, there is nothing different with the general purpose oscialloscope circuit, trigger signal source can be from two channel signals any one, no matter be direct current or AC coupling, high frequency still is low frequency inhibition etc., all pass through the trigger pip gating circuit and be linked in high-speed comparator (AD8564) array and compare, generate the high speed logic pulse signal with triggering level; Data channel and high frequency control module receive this trigger pulse and differentiate processing, triggering state and sampling do action signal on opportunity are through the triggering status signal after the multiple signals ADC sampling phase recognition sequence, so just will trigger the moment and the data sampling error that do not match constantly and be reduced to a minimum sampling interval---the magnitude of 1.25ns, make full use of the aggregate bandwidth of multi-channel A C, improved the sampling degree of accuracy greatly; Capture predetermined triggering state constantly after, data channel and high frequency control module just drive thereupon samples, communicates by letter and synchronous logical process function such as data algorithm processing.Because trigger signal source can be by gating and conversion, so, just strengthened the dirigibility that the system triggers mode is selected more, can trigger display waveform according to this channel signal, also can select other any passages even improper signal to be used as the triggering source, enrich oscillographic application function, do not need the user to carry out technical finesse and manual adjustment again, just can finish the logical combination of multiple triggering and metering system, reduce the difficulty that program is adjusted, target effect is better.High-speed comparator among the design also compatibility has designed more high level comparer chip (ADCMP580, only 80ps time-delay) application, has improved measurement accuracy more.
As shown in Figure 6, analog to digital conversion adc circuit 3 is connected and composed by signaling interface, analog to digital conversion ADC chip array circuit, the ADC array periphery compensating circuit of gating signal distributor circuit, the sampling pulse of ADC array chip need of work and control signal are connected to FPGA (data channel and high frequency control module) by sampling pulse and control signal interface, by its generation and affact analog to digital conversion ADC chip array circuit.
The analog-to-digital conversion adc circuit is finished signal sampling and quantification work, the present invention has designed the array circuit of 4 road ADC chip clock phase-splitting interleaving techniques samplings, just to same one road signal, sample respectively by 4-8 ADC at different clocks, collect the continuous data of segmentation continuously by multi-disc ADC phase-splitting interlaced sampling technology, realized adopting cheaper ADC to finish the high-speed sampling function tasks, the signal Processing bandwidth improves greatly; Design has internal protection circuitry and peripheral signal compensating circuit (diode circuit voltage-limiting protection and RC high-frequency compensation) on the circuit; dsp processor also will carry out filtering and algorithm compensation to be handled; signal quality also is guaranteed; solved the dependency problem that oscillograph is used the high-speed ADC of costliness; the ADC chip (AD9288) of four 8 road 100M bandwidth; just realize 800M bandwidth sampling function, reduced the manufacturing cost of instrument.The control clock of ADC array chip need of work, 8 fens phase clocks are to be exported by synchronous clock generation and the divider of FPGA, the analog-to-digital conversion adc circuit is finished sampling and quantification work under this signal effect.
As Fig. 7,8,9, shown in 10, data channel and high frequency control module 5 based on FPGA comprise sampling pulse and control signal interface and sampling data passageway interface and data buffering processing logic module, synchronous clock takes place and divider, the eye diagram data logic module, data flow algorithm is handled and computing module, low-speed clock takes place and divider, system's signalization processor, the encoded keyboard signal processor, encoded keyboard interface logic successively connects, synchronous clock takes place and divider acts on the trigger pip logic processing module, and with data buffering processing logic module, trigger pulse inserts the terminal logic interconnection, data stream behind the data buffering processing logic module buffer memory is connected to the PPI of dsp processor system functions of modules interface through data channel, IIC functions of modules interface, the IlC data communication module, encoded keyboard signal processor and data buffering processing logic module be logic interconnection successively, the functions of modules interface, system's signalization processor, the trigger pip logic processing module is interconnection successively also.
Data channel and high frequency control module are based upon on the digital logic chip based on the FPGA technology, are this oscillograph function design cells of centralization the most, also are the cores of system data coordination and State Control.It mainly comprises, one trigger pip logic processing module, be used for accepting the trigger pulse that trigger pulse inserts the terminal input, triggering mode and trigger mode according to system's signalization processor are provided with parameter, finish the logical process process of trigger pip and produce triggering pulse on opportunity---the cycle criterion of circulating sampling action need, as shown in Figure 9, after the channel trigger signal that the trigger pulse input terminal inserts is eliminated the circuit logic processing through burr, enter the hold-off condition handler, its output outputs to MUX or sampling phase recognition logic module after the status register isolation is temporary, after the video trigger pip that the trigger pulse input terminal inserts is eliminated the circuit logic processing through burr, enter row, line is counted processor, its output outputs to MUX or sampling phase recognition logic module after the status register isolation is temporary, after the pulse width trigger pip that the trigger pulse input terminal inserts is eliminated the circuit logic processing through burr, enter pulse width measuring and processing logic module, its output outputs to MUX or sampling phase recognition logic module after the status register isolation is temporary, the trigger module distribution network that resets, clock distribution network is to take place and divider by resetting, the signal network that affacts each logic function module of inside modules that clock takes place and divider produces, trigger enable register and receive the triggering status signal of MUX and the relevant parameter state generation of register triggering cycle criterion is set, and whether decision-making produces states such as forced-triggered according to the trigger module parameter; One data buffering processing logic module, it can receive status signals such as triggering cycle criterion that the trigger pip logic processing module produces and forced-triggered, phase identification data mode in conjunction with the generation of sampling phase recognition logic module, produce ADC chip array sampling pulse and control signal, and each road ADC sampled data received inner logical data buffer channel by interface, as shown in figure 10, the data-signal of sampling data passageway interface at first is input to 8 groups of register arrays by data selector, in synchronization caching device array and the output register array, under the coordination control of fifo status datacycle control and cache element, sampled data is selected regularly, combination, be buffered to the high capacity synchronization fifo DCU data control unit of alternation, then according to the input data of trigger data output interface and the data processed result of trigger data compensation processor, the sampled data stream of generation dsp processor communication in the past, by PPI interface communication controller data stream is outputed to the PPI functional module interface of FSP processor system again, same, state exchange and controller signals, the data buffering module distribution network that resets, data buffering module clock distribution network all is state and the control signal net that acts on the module overall situation; Data channel and high frequency control module also comprise other standard logic processing capacity circuit such as unit such as system encryption processing module, IIC data communication module, system's signalization processor, encoded keyboard signal processor, and the part DSP algorithm process of finishing sampled data stream of also will walking abreast and computing function (as FFT) and multiple oscillometric data logical process function such as emerging " eye pattern " are measured oscillography function, video or audio standard Data Stream Processing function etc.; This module fpga chip also has an application configuration chip, can realize the soft configuration of hardware capability by communication mode down loading updating logical codes such as USB interface, the expansion, the upgrading performance good.The flogic system of these logical relation complexity, time sequence status strictness, high-frequency data Control on Communication, described data channel and the high frequency control module finishing whole oscillograph work control and need to coordinate have just been constituted based on FPGA, as shown in Figure 7, be its logic function flow process and schematic diagram.
As shown in figure 11; dsp processor system 6, but comprise PPI functions of modules interface, carry out the control signal interface, button control port and circuit, reset and holding circuit, real-time clock and battery charger, audio recording and reproducing circuit, logical encrypt control interface, system are provided with I/O interface, IIC functions of modules interface expanded scope interface, CF card memory, optional extendible data communication interface (USB, UART, Eth-net and 1394 live wires), flash memory, dynamic storage and system clock circuit.Design has functional modules such as CF card memory, optional extendible data communication interface (USB, UART, Eth-net and 1394 live wires are optional), real-time clock and audio recording and reproducing circuit in the dsp processor system, these all are the new design functions that is different from traditional oscillograph, and interfaces such as USB can also carry out system software and FPGA code update; Greatly facilitate use, sign, record and storage, the back-up job of all types of user, also be convenient to new function expansion and renewal in various test occasions.
As shown in figure 12, intelligent power switching and distributor circuit 9 are by standard A C-DC power module, lithium cell charging and testing circuit, lithium battery, the double loop power supply control switching circuit, but conserver power source switches set, low-tension supply DC-DC conversion chip [DC-DC chip (5V), DC-DC chip (3V), DC-DC chip (5V), LDO low-tension supply module] the mutual composition that is electrically connected of group, they are connected to each power unit and module by distribution network, and the execution control signal that dsp processor takes place acts on the power switch group, double loop power supply switches and control circuit, lithium cell charging and testing circuit.Having finished to automatically switch uses standard power frequency AC-DC modular power source and internal battery power supply to come function as circuit system and module for power supply, expanded the usage space (use of instrument is no longer dependent on AC Power supply socket) of instrument greatly, also possesses the online and off-line charging design of battery, two batteries can satisfy workaday surveying work demand of outdoor subscriber, have also adopted energy-efficient controlling Design technology on intelligent energy-saving.These power supply controls efficiently and translation circuit under the execution control signal effect of dsp processor generation, the power supply that strict proportional distribution battery or AC-AC come between each power unit of oscillograph, equipment and link.
As shown in figure 13; double loop power supply switches and control circuit comprises that external power supply inserts the detection logical circuit; the lithium battery testing circuit; delay switch machine logical circuit; the switch control logic circuit; switching controls chip 1473; change-over switch MOSFET pipe is right; internal protection circuitry also is connected to each DC-DC translation circuit successively; external power supply; the lithium cell charging control circuit; lithium battery; the lithium battery testing circuit is electrically connected successively, lithium battery; change-over switch MOSFET pipe is right; switching controls chip 1473; the switch control logic circuit; external power supply inserts the detection logical circuit and change-over switch MOSFET pipe interconnects to circulating successively.Wherein, power supply signal and LM393 comparator level that external power supply access detection logical circuit picks up access relatively produce logical pulse; be transported to logic chip 7402 actions; the main devices of switch control logic circuit also is these logic chips; switching signal generation chip 1473 connects control high performance switch MOSFET pipe to NTMD6N02R2; quick action is beneficial to protection inner power unit and link.Lithium battery testing circuit and lithium cell charging control circuit have all adopted the high performance chips of Linear Tech and have designed the battery detecting and the charging control circuit of standard.
As shown in figure 14, the flow process relation of oscillographic ADC sampling and data processing flow graph are clear and definite sampled data stream processing and some main system parameter setting, Figure 15 is a software flow pattern of the present invention.Software section will finish the storage of system state configuration, adjusting and control, Date Communication at High Speed, sampled data and processing, waveform show and DSP handles and some other subsidiary function.As shown in figure 15, after instrument started, system can finish serial initial work according to detected status of equipment, needed to download new procedures or carried out system again when being provided with, and repeated aforesaid operations; Hardware configuration and in stable condition after, system enters sampling operation and data communication state automatically, requires the implementation data signal Processing, display waveform and result of calculation according to user's operation.These operating functions all are to finish on powerful double-core (the BLACKFIN digital signal processor of ADI) chip ADSP561, and dispose rich in natural resources, can finish a lot of desk-top oscillographs and not have data processing, calculating and analytic function; Instrumental function of the present invention comprises: the number percent of video data and sampled data, about during up and down cursor magnitude of voltage, triggering level, cycle, dutycycle, rise time, fall time, frequency, maximal value, mean value, minimum value, peak-to-peak value, positive pulse width, negative pulse width, root-mean-square value, frequency spectrum divide the width of cloth-frequency characteristic, mutually-frequency characteristic, auto-power spectrum function, cross-power spectrum function and autocorrelation function, cross correlation function etc., and not as wherein several parameters of a traditional oscillograph demonstration.
A kind of portable universal digital storage oscillograph that the present invention relates to has realized measuring various power supply signals, power and chopping signal, fixed frequency signal, direct current signal, Digital Logic, width modulation, amplitude modulation and frequency modulation, audio frequency and video and serial communication various general purpose oscialloscope functions such as " eye patterns "; Its application characteristic shows that mainly total system mostly adopts integrated circuit and high efficiency electronic devices and components, there are not several discrete physical construction electrical equipments, saved electric energy, dwindled volume, reduced cost, realized exchanging AC-DC power module and the changeable power supply of internal battery, unit finish that complicated signal Processing and result of calculation show, can be widely used in the various operating environments of various industrial circles, a kind of universal measurement instrument---portable universal digital storage oscillograph.Particularly, it comprises:
The optional passive probe of one cover is used for inserting various industry spot electric signal;
One cover can decay to the electric signal of input, along separate routes and the signal transformation modulate circuit of conditioning;
One triggers function produces circuit, and it can cooperate the clock selecting of high frequency logic control module according to different signal waveforms and corresponding disposal route, produces the needed trigger pip of waveform capture-process;
One analog to digital conversion adc circuit, each road input signal can be equipped with 4 road ADC and carry out interlaced sampling;
One data channel and high frequency control module based on FPGA has data logical algorithm processing capacity;
One dsp processor system finishes the digital signal processing function, as the systemic-function platform of whole instrument;
One digital signal LCD display is used for shows signal waveform and other service datas;
One cover outbound data interface comprises USB, UART, Eth-net and 1394 live wires, also is used for finishing the updating task of systemic-function software;
One intelligent power switches and distributor circuit, finishes power supply switching, the online charging of battery and power distribution function;
One standard power frequency AC-DC power module is furnished with a power frequency supply socket and power lead;
One chargeable battery external member comprises two 7.2 volts of lithium batteries and a charger, but instrument adopts monocell continuous working 4 hours.
Indicate that this oscillographic the key technical indexes is:
(1) maximum real-time sampling rate 800MS/s and 400MS/s;
(2) maximum input voltage is 500 volts;
(3) vertical sensitivity is 5 millivolts/lattice, until 50 volts/lattice;
(4) two passages, input impedance: 1Mohm/20pF ± 2%;
(5) power frequency AC-DC power module and the internal battery double loop power supply power supply of can automaticallying switch;
(6) multiple advanced person's triggering mode;
(7) the multiple calculation process of sampled data and measurement function automatically;
(8) the multiple storage mode of sampled data and waveform and soft, hard copy function;
(9) volume is little, and is in light weight, less than 2000 grams.
The foregoing description is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (9)
1, a kind of portable universal digital storage oscillograph, it is characterized in that, passive probe (1) and signal transformation modulate circuit (2), analog to digital conversion adc circuit (3), data channel and high frequency control module (5), dsp processor system (6), data-interface (8) joins, signal transformation modulate circuit (2) produces circuit (4) with the triggering function, data channel and high frequency control module (5), analog to digital conversion adc circuit (3) joins, digital signal LCD display (7) and dsp processor system (6), signal transformation modulate circuit (2) joins, chargeable battery (11), AC-DC power module (10) switches and distributor circuit (9) with intelligent power, dsp processor system (6) joins.
2; a kind of portable universal digital storage oscillograph according to claim 1; it is characterized in that; described signal transformation modulate circuit (2) is: external signal inserts holding circuit and hyperchannel attenuator circuit; signal conversion circuit; the echo signal switching switch circuit; internal signal protection and compensating circuit; buffer circuits; the trigger pip gating circuit; the AD8564 interface circuit joins; trigger pip gating circuit and gating signal distributor circuit; the AD9288 interface circuit is electrically connected; carry out the control signal interface and connect the dsp processor system, act on the gating signal distributor circuit; the trigger pip gating circuit; echo signal switching switch circuit and signal conversion circuit.
3, a kind of portable universal digital storage oscillograph according to claim 2, it is characterized in that described signal conversion circuit is electrically connected mutually and is formed by ac-coupled circuit, DC coupling circuit, HF reject circuit, low-pass filter circuit, bandwidth-limited circuit, trigger pip selection circuit.
4, a kind of portable universal digital storage oscillograph according to claim 1, it is characterized in that, described triggering function produces the signal that circuit (4) receives the output of trigger pip gating circuit, by signal Processing and translation circuit, comparator array AD8564, the trigger pulse of data channel and high frequency control module (5) inserts the terminal composition that is connected, dsp processor system (6) DAC interface control ratio is than level generating circuit (DAC) and be connected to comparator array AD8564 as the reference level, and the external trigger signal is communicated to comparator array AD8564 in order to produce a kind of trigger pulse through the external trigger signal conversion circuit.
5, a kind of portable universal digital storage oscillograph according to claim 1, it is characterized in that, described analog to digital conversion adc circuit (3) is connected and composed by signaling interface, analog to digital conversion ADC chip array circuit, the ADC array periphery compensating circuit of gating signal distributor circuit, the sampling pulse of ADC array chip need of work and control signal are connected to FPGA (data channel and high frequency control module) by sampling pulse and control signal interface, by its generation and affact analog to digital conversion ADC chip array circuit.
6, a kind of portable universal digital storage oscillograph according to claim 1, it is characterized in that, described data channel and high frequency control module (5) based on FPGA comprises sampling pulse and control signal interface and sampling data passageway interface and data buffering processing logic module, synchronous clock takes place and divider, the eye diagram data logic module, data flow algorithm is handled and computing module, low-speed clock takes place and divider, system's signalization processor, the encoded keyboard signal processor, encoded keyboard interface logic successively connects, synchronous clock takes place and divider acts on the trigger pip logic processing module, and with data buffering processing logic module, trigger pulse inserts the terminal logic interconnection, data stream behind the data buffering processing logic module buffer memory is connected to the PPI of dsp processor system functions of modules interface through data channel, IIC functions of modules interface, the IIC data communication module, encoded keyboard signal processor and data buffering processing logic module be logic interconnection successively, the functions of modules interface, system's signalization processor, the trigger pip logic processing module is interconnection successively also.
7; a kind of portable universal digital storage oscillograph according to claim 1; it is characterized in that; described dsp processor system (6) comprises PPI functions of modules interface; carry out the control signal interface; button control port and circuit; reset and holding circuit; real-time clock and battery charger; the audio recording and reproducing circuit; the logical encrypt control interface; system is provided with the I/O interface; IIC functions of modules interface; but expanded scope interface; the CF card memory; optional extendible data communication interface (USB; UART; Eth-net and 1394 live wires); flash memory; dynamic storage and system clock circuit.
8, a kind of portable universal digital storage oscillograph according to claim 1, it is characterized in that, described intelligent power switching and distributor circuit (9) are by standard A C-DC power module, lithium cell charging and testing circuit, lithium battery, the double loop power supply control switching circuit, but conserver power source switches set, low-tension supply DC-DC conversion chip [DC-DC chip (5V), DC-DC chip (3V), DC-DC chip (5V), LDO low-tension supply module] the mutual composition that is electrically connected of group, they are connected to each power unit and module by distribution network, and the execution control signal that dsp processor takes place acts on the power switch group, double loop power supply switches and control circuit, lithium cell charging and testing circuit.
9; a kind of portable universal digital storage oscillograph according to claim 8; it is characterized in that; described double loop power supply control switching circuit comprises that external power supply inserts the detection logical circuit; the lithium battery testing circuit; delay switch machine logical circuit; the switch control logic circuit; switching controls chip 1473; change-over switch MOSFET pipe is right; internal protection circuitry also is connected to each DC-DC translation circuit successively; external power supply; the lithium cell charging control circuit; lithium battery; the lithium battery testing circuit is electrically connected successively, lithium battery; change-over switch MOSFET pipe is right; switching controls chip 1473; the switch control logic circuit; external power supply inserts the detection logical circuit and change-over switch MOSFET pipe interconnects to circulating successively.
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| CN 200610155604 CN101013142A (en) | 2006-12-29 | 2006-12-29 | Portable universal digital storage oscillograph |
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| CN 200610155604 CN101013142A (en) | 2006-12-29 | 2006-12-29 | Portable universal digital storage oscillograph |
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