CN2699308Y - Oscilloscope - Google Patents

Abstract

The utility model discloses a palm oscilloscope with current supply by USB bus, relating to an oscilloscope, which comprises a multi-level signal regulating device with entire integrated circuit, a trigger signal generator, an analog-digital conversion ADC device, a high-frequency controller based on FPGA, a USB communication control single chip machine and a set of power transfer and control devices; by the current supply of the USB bus, the utility model implements the function of measuring general oscilloscopes such as the alternating current power sign, the rectified waveform, the direct current and regular alternate current sign, the digital logic, the impulse-width modulation and chopped wave, the amplitude modulation and frequency adjustment, the image frequency and acoustic frequency, and also serial data. The utility model greatly decreases the volume, weight and manufacturing cost of the oscilloscope, and ensures the index of performance of the measure oscilloscope.

Description

Oscillograph

Technical field

The utility model relates to a kind of oscillograph, especially, relates to a kind of palm oscillograph of usb bus power supply.

Background technology

In recent decades, the electric technology of advancing by leaps and bounds is penetrated into the science and technology and the every field of social life gradually, and the development of all these relevant departments and industry all in a large number need be as the means of information measurement and control and the electronic measuring instrument of equipment; " just do not measure and do not differentiate that science and technology just can not be advanced ", competition unprecedented violent also makes various electronic surveying apparatuses more and more become the indispensable material base that research and production develop.Oscillograph is one of instruments the most general in the electronic measuring instrument as technology-intensive, knowledge-intensive products, is the pacing items and the means of all electronic and electrical equipment scientific researches, production, test, maintenance.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.This shows, the diversity of purposes, suitability and necessity, make oscillograph 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., become the supporting and indispensable important component part of economic construction of many Important Project, bringing into play huge day by day effect at aspects such as scientific research, national economy and social life.

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.Also have some digital storage oscilloscopes, though reduced price and easy to use to a certain extent, also be difficult to reach that similar multimeter carries equally conveniently, more cheap, better, faster, use target more easily; In addition, the less high-end hand-held instrument of indivedual volumes has been arranged abroad, but price is high, is unfavorable for promoting.

General purpose oscialloscope is to show instrument with measured waveform with high input impedance, as its name suggests, it just is not suitable for observing the electronic signal of a certain particular category, but can observe and measure a kind of device from direct current to the digital and analog signaling that exchanges, has certain big voltage amplitude in the same way.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, often need the mode of Industrial Frequency Transformer and Switching Power Supply to power, problems such as volume is huge relatively, power consumption and interference cause the popularization that is difficult to emerge of low cost, convenient practical, small and exquisite testing tool of whipping.

The utility model content

The purpose of this utility model is exactly to overcome the above-mentioned shortcoming and defect that existing oscillograph exists, the palm general purpose oscialloscope of the usb bus power supply of the very high shortage in weight of a kind of ratio of performance to price 200 grams is provided, because it shows the waveform of test signal by usb bus on PC, also be a kind of high performance virtual oscilloscope.

The purpose of this utility model is achieved in that

The utility model has been broken through the limitation of traditional instrument mentality of designing, the mode structure itself that adopts usb bus to power does not have the dummy general oscillograph of power module, is different from those similarly based on low pressure sampling card parallel interface or other high-speed buses, that be equipped with power supply or oscilloscope device yet; It adopts modern integrated circuit to constitute each chief component of instrument; popularity at the general purpose oscialloscope measuring-signal; dexterous design signal transformations at different levels and conditioning device; cooperate necessary circuit protection and safe handling technology; under the prerequisite of guaranteed performance index, develop Ultra Low Cost, volume is little and lightweight general limited power consumption figures storing virtual oscillograph.

Particularly, it comprises: an input end, comprise two BNC connectors, and be used for receiving measured electric signal; One is used for above-mentioned input electrical signal is nursed one's health the multilevel signal conditioning device of conversion; One trigger pip generating means is used for forming the trigger pip of unlike signal waveform display process process need; One digital-to-analog conversion ADC device has the differential amplification driving circuit that can well overcome common mode interference; One high frequency controller based on FPGA; One usb communication control single chip computer as usb communication driven end and Instrument working state configurator; One power conversion and control device; The multilevel signal conditioning device, comprise attenuator circuit, overvoltage crowbar switch, triode high frequency voltage stabilizer, contactor isolation controller, MUX, AC/DC change-over switch, impedance conversion impact damper U18, secondary extinction circuit and high speed No. four selector switchs, they are electrically connected successively; The trigger pip generating means, comprise ± 5 volts of reference sources, digital regulation resistance, four road comparers, trigger pips are nursed one's health strobe unit, external trigger signal regulating device, and the controller that links to each other with comparator output terminal, and they are electrically connected successively; Power conversion and control device, comprise USB port, 3.3 volts of electric power conversion apparatus, power switch, 1.5 volts of LDO devices, ± 5 volts of power generators, ± 12 volts of power generators and they are to the distribution network of each power consumption unit; They distribute 2.5 watts USB power supply between described each device of oscillograph and components and parts under the control of single-chip microcomputer.

Indicate that this oscillographic the key technical indexes is:

(1) maximum real-time sampling rate 100MS/s and 200MS/s (when two passages are merged into single channel), the input bandwidth is DC-20MHz;

(2) 500 volts of maximum input voltages (BNC connects, when adopting 1: 1 probe);

(3) vertical sensitivity is 10 millivolts/lattice, until 50 volts/lattice;

(4) two passages, input impedance: 1Mohm/20pF ± 2%;

(5) USB1.1 or 2.0 ports are connected to PC, the usb bus power supply;

(6) the equivalent sampling rate can reach 5GS/s;

(7) multiple advanced person's triggering mode;

(8) the multiple calculation process of sampled data and measurement function automatically;

(9) the multiple storage mode of sampled data and waveform and soft, hard copy function;

(10) volume 120mm * 85mm * 25mm only, shortage in weight 200 grams.

Characteristics and the advantage of the utility model in performance and application has:

Only need usb bus power supply, lightly portable, on PC, carry out complicated and detailed sampled data and digital signal processing work, be particularly suitable for the test and the equipment debugging of on-the-spot electric signal.

This oscillograph is all electronic in the functional circuit design, do not adopt the mechanical devices of separation, dwindled volume greatly, can be articulated in easily on USB or other interfaces, also can make damascene structures, dispose or be installed on the various surveying instruments, just can realize the intelligence instrument combination of flexible configuration with lower cost, smaller volume.

Because this oscillograph can often be manipulated conveniently, on structure and physical layout design, make every effort to compact, each is formed module has carried out electric measurement respectively and has analyzed to avoid various electrical Interference and infringement, Safety Design is also paid the utmost attention to, and implemented reliable analysis of heat transmission and topological design, measurement performance has obtained reliable checking and guarantee.

As everyone knows, oscillograph is the important tool of on-the-spot test, there is not which slip-stick artist to be ready lifting an oscillograph and a pile power supply to on-the-spot, this oscillograph only needs the USB cable power supply, volume is little, in light weight, be convenient to carry conveniently, all occasions of measuring, debugging and overhauling of needing can conveniently be used.

The utility model is similar has realized typical oscillographic 26S Proteasome Structure and Function, and has the very high ratio of performance to price, adapt to higher, upgrade, measure faster problem and measurement demand, therefore aspect education, scientific research, industrial manufacturing, family and individual's application or the like, all have good market outlook.

Description of drawings

Fig. 1 is oscillographic basic structure schematic diagram;

Fig. 2 is oscillographic circuit design block scheme;

Fig. 3 is the design frame chart and the local detail circuit diagram of multilevel signal conditioning device;

Fig. 4 is the design frame chart of trigger pip generating means;

Fig. 5 is an analog to digital conversion ADC Design of device block diagram;

Fig. 6 is based on the module of the high frequency controller of FPGA and forms and the functional circuit schematic diagram;

Fig. 7 is oscillograph power conversion and the synoptic diagram of control device on power distribution;

Fig. 8 is the flyback circuit schematic diagram that produces positive and negative 12 volts of power supplys in oscillograph power conversion and the control device;

Fig. 9 is the basic operation process flow diagram of oscillograph PC software.

Embodiment

As can be seen from Figure 1, the same with other universal digital storage oscillographs, circuit between oscillographic signal input connector and waveform demonstration is the mixture of mimic channel and digital circuit, at first want signal condition, conversion and input under the control of complete operation state parameter, use an analog/digital converter (ADC) then these momentary signal digitizings.Because sampled data will be stored subsequently in storer, the waveform that the waveform that we see on the oscillograph screen is always rebuild by collecting data, rather than the waveform immediately, continuous of institute's plus signal shows on the input link.Therefore, the usb communication module of a high speed of increase does not change principle, essential characteristic and the function of digital storage oscilloscope; On the contrary, processing at signal data, after expression and scaling function thereof have been transplanted to upper layer software (applications), utilize the powerful resource of PC, can in real time various information be extracted effectively, set up the advanced analysis storehouse of data processing and the tool storage room (analysis of spectrum of measurement result for example more widely, fast fourier transform, various digital filters, process of convolution and related function are handled, infinitesimal analysis, regretional analysis, numerical operation, time and frequency domain analysis etc.), make oscillograph might develop into the device of the very complicated Auto-Test System part of establishment simultaneously again, can expand its application in big system testing and data management better.

As shown in Figure 2, the importing and the multistage conditioning conversion fraction of oscillographic functional module 100 expression measured signals; 200 parts are the trigger pip generating meanss that produce trigger pulse from different signal sources; 300 is exactly that described the conversion by input signal differential driving unit and mould/number quantizes the analog to digital conversion ADC device that output unit constitutes, wherein the thick arrow of aterrimus is represented that simulating signal is connected to from input end and is nursed one's health conversion 100, is connected respectively to the flow process that produces trigger pip in 200 and be connected to sample quantization in 300 again; The 400th, described usb communication control single chip computer and relevant I/O control circuit part; The 500th, this oscillographic one high-frequency signal controller that has the center to coordinate pivot function, adopt the high-performance fpga chip programmed of Altera to finish, be mainly used to control communication and the system state of sampled data to single-chip microcomputer, hollow arrow among the figure is just represented the communication stream of sampled data, and other single solid arrows are represented the control signal that each intermodule is interconnected; Because this oscillograph is to power by 500 milliamperes of 5 volts of limited power power-supplies of USB interface, 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 conditioning converting means (breakthrough realized the high pressure input signal conversion of high relatively power consumption and the low power dissipation design of active driving circuit), the electricity consumption standard that also has circuit such as FPGA and single-chip microcomputer, the direct current DC-DC translation circuits at different levels that adopt and design are all divided in function, performance, conversion efficiency and control, tightly design on the economic rationality, the basic function and the superperformance of the general purpose oscialloscope of 2.5 watts of power consumptions have been guaranteed, 600 parts among Fig. 2 are the distribution system that described power conversion and control device constitute, and hollow empty arrow has characterized the assign direction of power supply substantially.The 700th, the measured signal input end.

As shown in Figure 3, be the design fundamentals figure of multilevel signal conditioning conversion fraction 100 among Fig. 2.This partial circuit is from the signal incoming end of bnc connector 700; by attenuator circuit 110, overvoltage crowbar switch 120, high frequency voltage stabilizer 130, contactor isolation controller 140, MUX 150, AC/DC change-over switch 160, impedance conversion impact damper U18, secondary extinction circuit 170 with element circuit such as No. four selector switchs 180 and some other devices are formed and electrical connection successively at a high speed.

Input signal inserts oscillographs through probe, 700, selects for use the suitable voltage dependent resistor (VDR) VR1 of frequency characteristic as first order circuit protection.The MUX 150 that the back connects metal-oxide-semiconductor contactor 120, triode high frequency voltage stabilizer 130 successively and constructed by HF switch, because the high-voltage signal that oscillograph may insert can produce overvoltage harm to the integrated device work of the whole electronics in back, so connected the custom-designed triode high frequency voltage stabilizer 130 of a cover on the channel signal line, the signal tie point voltage on the assurance MUX 150 is no more than the operating voltage in the design; But, in case the overvoltage phenomenon has taken place, because that the nonlinearities change of circuit impedance must cause from 700 potential change that insert device and 150 to each signal is non-linear, the authenticity of infringement measured signal; Therefore, adopted the parallel attenuator circuit 110 of separation as shown in Figure 3 in the circuit design, only connecting resistance R 30 grades in the ground floor circuit uses as voltage stabilizing current limliting and circuit compensation device, the second layer is by resistance R 1, R2 realizes the decay of tenth of the point pressure, the 3rd layer by resistance R 3, R4 realizes the decay of one of percentage dividing potential drop, when certain layer has the overvoltage phenomenon to take place, the input signal that just disconnects this layer metal-oxide-semiconductor switch connects, realize that signal imports after the decay on one deck down, avoided impedance to expect changing the access signal non-linear distortion that causes and the infringement of inner low-voltage circuit; Because oscillographic input impedance wants standardized designs in 1M ohm scope up and down, so this circuit adopts the attenuator circuit of two about 2M ohms to realize the two-stage dividing potential drop, otherwise, if attenuation level in parallel is too many, single-level circuit input impedance is just too big, though designed building-out capacitors such as C1, C2, C3 and C4 in the circuit, also be unfavorable for reliably guaranteeing undistorted the passing through of signal medium-high frequency composition; Like this, the threshold voltage of back MUX 150 just can design more than 10 volts, up to 15 volts, has satisfied general purpose oscialloscope and can directly import, measure the measurement demand that high-tension electricity particularly has many uncertain radio-frequency component high-tension electricities.Formed metal-oxide-semiconductor switch isolation controller by pulse signal generator and transformer in 140, controlled the action of metal-oxide-semiconductor according to overvoltage whether judgement by program, as shown in the figure, it has corresponding the electrical connection with high frequency controller 500 based on FPGA.

150 and 160 is that multiple signals selector switch under controller 500 operation control exchanges with gating signal, the on-off circuit of DC coupling.U18 is to the impedance conversion of gating signal and buffering device, has characteristics such as good high frequency performance and low noise.The output signal of impact damper U18 is done further dividing potential drop decay through 170 on one side, is also connected to 200 trigger pip generating meanss in addition and triggers the source as channel signal.The 180th, the high speed high resistant buffering input four-way MUX under the FPGA control is used for realizing that program control gating is fit to one road signal of ADC sampling input standard, becomes the sample quantization unit of delivering to 300 representatives.Wherein, 150 have also connected the calibration level reference signal that produces in the trigger pip generating means 200, to realize the program control calibration function of circuit error.Circuit among the above and Fig. 3 only is the description of a channels designs, and the another one passage has identical Design and Features, symmetry arrangement physically.

As shown in Figure 4, it is the design concept block diagram of this oscillograph trigger pip generating means 200, comprise that reference source and comparer, trigger pip handling part grade, do not adopt traditional dependence DAC chip to produce the method for adjustable trigger bit standard, but by ADR01 and INA105 combinational circuit 210 produce ± 5 volts of reference sources directly offer precision 1% with interior digital regulation resistance 220, parameter according to controller 500 is provided with accurate trigger bit standard of the generation of tap therebetween, shown in the thick arrow of the black among the figure, be connected to four road comparers 230 and produce the triggering logic.Certainly, trigger signal source can be from any one signal of handling through trigger pip conditioning strobe unit 240 in two channel signals of U18, no matter be direct current or AC coupling, high frequency still is low frequency inhibition etc., all be sent in the high-speed comparator in 230 and compare with the trigger bit standard, the high-speed logic signal that generates is connected to controller 500, handle complexity and degree of accuracy requires extra high triggering logical signal, response to trigger requirement by wherein state machine is unified, and sample, control signals such as communication and data algorithm processing.So, simplified circuit design, reduced power consumption and cost, also reduced programme controlled difficulty, target effect is better on the contrary.Equally, trigger signal source also can selection or the external signal of simulating signal or Digital Logic, is connected to comparer 230 through external trigger source interface and external trigger signal regulating device 250.

Analog-to-digital conversion ADC device 300 is mainly finished sampling and quantification work; circuit design is more unified mostly; as shown in Figure 5; main change is to connect a list/binary channels operation change-over switch 310 in two channel signals (180 output terminal) back of gating; carry out diode circuit voltage-limiting protection and RC high-frequency compensation for channel signal again by circuit 320 then; its driver output signal through the high frequency amplifier differential transformation in 330 after; the ADC chip in 340 be can enter, sampling and quantification work under the clock effect that the FPGA controller is set, finished immediately.The sampled data temporary cache is in controller FPGA, only carry out little hardware fast algorithm processing (as the FFT computing below 512 o'clock) in FPGA inside and just be sent in the internal memory in the usb communication control single chip computer 400, so that the data extract of PC program and processing are used.

500 representatives are this oscillograph function design cells of centralization the most based on the high-frequency signal controller of FPGA among Fig. 2, also are the cores of system coordination and control; Its program can be solidificated in the FPGA configuring chip in advance, also can in the PC software operation, download to single-chip microcomputer 400 by USB cable, and then program control initialization system and implement the program code of control function when being burnt in the configuring chip as each electrifying startup.Such design has realized the soft configuration of hardware capability, the expansion, the upgrading performance good.The basic function circuit design framework of this controller 500 as shown in Figure 6.

It mainly comprises, each decoding of module controls parameter and control state machine 570 between single-chip microcomputer 400 and the FPGA, be used for accepting the communication data of single-chip microcomputer and produce control signal and the parameter that other each unit, module need, as shown in the figure, having the control of a lot of needs and status signal to be connected to difference in functionality module in 100,200,300 and even 600, generally is exactly control, the status signal of finishing self-defining I2C protocol data communication and producing needs according to agreement transliteration sign indicating number; Clock multiplier is with phase-locked loop module 510, produces 100M clock CLK100 and 200M clock CLK200 based on the high frequency controller action need of FPGA by the 24M clock signal clk _ OUT from single-chip microcomputer; Sampling and data communication clock-signal generator 520, the external FIFO clock F_CLK that each built-in function clock that functions such as its generation coordination data sampling, signal shaping, metadata cache and data communication need and single-chip microcomputer 400 need; The sampled data fifo circuit 530 of two 2K * 8, also has corresponding data communication control state machine 540, the data communication state of this control module and fifo module 530 and single-chip microcomputer 400 has strict sequential relationship, and the thick arrow of the black shown in the figure has just been represented the flow direction of sampled data from analog to digital conversion adc circuit 300 to FIFO530 and single-chip microcomputer 400; Secondly be exactly to trigger logic, trigger pip according to mode and parameter generating that single-chip microcomputer 400 is set, generate necessary trigger point bit data, and according to the module 550 of calculating the sampled data FFT of some from 300 communication data---trigger logic, flip-flop number and fft algorithm part, design has a trigger pip treatment state machine, be used for specially being responsible for receiving the trigger pip that four road comparers (230) produce, and require to produce the triggering state and the control signal corresponding of measured signal under the various triggering modes according to program control operation; And with controller internal data and computing information and 400 mutual modules 560---counting and computational data Communications Processor Module.The logic control system of these logical relation complexity, time sequence status strictness, data high-frequency communication has just constituted the described high frequency controller based on FPGA of finishing whole oscillograph work control and need coordinating.

Also as can be seen, so a Circuits System is sought after the rational and effective power distribution network on the strict demand of top modular design and the intricate property, and detailed power consumption and effectiveness analysis are important.The power conversion that each ingredient of this oscillograph needs, distributor circuit synoptic diagram are as shown in Figure 7.In the design, the electric current that obtains from PC owing to the finiteness of USB interface power supply supply and when beginning to insert is only reasons such as 100 milliamperes, adopted synchro switch DC-DC chip MIC2204 efficiently to constitute the DC power supply of 3.3 volts of electric power conversion apparatus 620 as sampling A in single-chip microcomputer 400, the FPGA controller 500 and 300 etc.; Also have simultaneously one the tunnel after usb communication control single chip computer 400 operate as normal just the FPGA nuclear power of action power supply with 1.5 volts LDO devices 640, and the power switch 630 of closure just after digital display circuit operate as normal---open whole analog signal conditioner change and send working power partly (± 5 volts power generators 650 with ± 12 volts of power generators 660).Wherein, ± 5 volts of power generators 650 mainly are the power supply requirements of supplying in analog to digital conversion ADC device 300, multilevel signal conditioning device 100 and the trigger pip generating means 200, and ± 12 volts of power generators 650 mainly are the power supply requirements of supplying in multilevel signal conditioning device 100 and the trigger pip generating means 200.All circuit design have all adopted the technology of the most little power consumption to carry out, as described in above all the elements, 100,200, each analogy signal processing unit circuit in 300 and 600 has all carried out accurate measurement, calculate and debugging, satisfying function, the Total tune design of performance requirement down, the power consumption of system has been reduced to possible minimum point, wherein, 3.3 the power supply power consumption is below 200 milliamperes, 1.5 the power supply power consumption is below 40 milliamperes, ± 5 volts of power supply power consumptions are below 100 milliamperes, ± 12 volts of power supply power consumptions are below 120 milliamperes, oscillograph fully can be under 2.5 watts power consumption operate as normal.

Fig. 8 provided ± the flyback circuit design concept figure of 12 volts of power generators 660, and such topological structure circuit is succinct, cheap, efficient is high.RN5RY202 is the PWM main control chip of mapping function, is controlled the conducting of field effect transistor Q3 and is closed by it, during conducting, just there is input voltage at inductor L1 two ends, at this moment input current flows into load, C104 and 101 ,+12 volts of power supply effects of capacitor C and takes place through D103 and D102.At this moment diode D101 is back-biased, and the electric current in the inductor continues to increase, in case Q3 is closed, for holding current flows, the polarity of voltage at inductor L1 two ends is opposite, and D103 and D102 are closed, D101 is open-minded, and circuit produces-12 volts power supply under the driving of discharge capacity C101.The resistance of regulating resistance R 101 and R102 changes the PWM operating characteristic of RN5RY202, the suitable duty time that just can the work of controlling filed effect, reaches the effect of output supply voltage value flexible.

Software section will be finished storage and processing, waveform demonstration and mathematics manipulation and some other subsidiary function of system state configuration, adjusting and control, usb data communication, sampled data.As Fig. 9, provided the basic operation process flow diagram of PC software, under the prerequisite of software installation, when the USB oscillograph inserted PC, system can finish the initial work of seriation immediately according to detected device id load driver program and operating software; Hardware configuration and in stable condition after, system enters sampling operation and data communication state automatically, and requires to implement the work of data necessary signal Processing, display waveform and computational data on the PC software interface according to user's different operating.Owing to these operations have been transplanted on the computer with powerful resource and processing power, can have been finished more data processing, calculating and analytic function that a lot of desk-top oscillograph does not have; All design functions comprise: video data account for whole sampled data set percentage, about the width of cloth-frequency characteristic, phase-frequency characteristic, auto-power spectrum function, cross-power spectrum function and autocorrelation function, cross correlation function etc. during up and down time 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, the frequency spectrum of cursor divide, rather than can only show wherein several parameters as traditional desk-top oscillograph.

The foregoing description is used for the utility model of explaining; rather than the utility model limited; in the protection domain of spirit of the present utility model and claim, any modification and change to the utility model is made all fall into protection domain of the present utility model.

Claims (4)

1, a kind of palm oscillograph of usb bus power supply comprises:

One input end comprises two BNC connectors, is used for receiving measured electric signal;

One multilevel signal conditioning device is used for above-mentioned input electrical signal is nursed one's health conversion;

One trigger pip generating means is used for forming the trigger pip of unlike signal waveform display process process need;

One digital-to-analog conversion ADC device has the differential amplification driving circuit that can well overcome common mode interference;

One high frequency controller based on FPGA;

One usb communication control single chip computer is as usb communication driven end and Instrument working state configurator;

One power conversion and control device;

It is characterized in that:

The multilevel signal conditioning device, comprise attenuator circuit (110), overvoltage crowbar switch (120), triode high frequency voltage stabilizer (130), contactor isolation controller (140), MUX (150), AC/DC change-over switch (160), impedance conversion impact damper U18, secondary extinction circuit (170) and high speed No. four selector switchs (180), be electrically connected successively between them;

The trigger pip generating means, comprise ± 5 volts of reference sources (210), digital regulation resistance (220), four road comparers (230), trigger pip conditioning strobe unit (240), external trigger signal regulating device (250), and the controller (500) that links to each other with comparer (230) output terminal, be electrically connected successively between them;

Power conversion and control device, comprise USB port (610), 3.3 volts of electric power conversion apparatus (620), power switch (630), 1.5 volts of LDO devices (640), ± 5 volts of power generators (650), ± 12 volts of power generators (660) and they are to the distribution network of each power consumption unit, they distribute 2.5 watts USB power supply between described each device of oscillograph and components and parts under the control of single-chip microcomputer (400).

2, oscillograph according to claim 1; it is characterized in that; described digital-to-analog conversion ADC device has single binary channels switching operating device, backward dioded protective device and signal compensator, and has the differential amplification driving circuit that can overcome common mode interference substantially.

3, oscillograph according to claim 1, it is characterized in that described high frequency controller based on FPGA comprises each control module parameter decoding and control state machine, PLL module, clock-signal generator, sampled data FIFO, reading and writing data sequential control and logic state machine, triggering logical triggering counting and fft algorithm part; Also having one can download and the configuring chip of burning program under single-chip microcomputer (400) sequential control by the mode of usb communication.

4, oscillograph according to claim 1, it is characterized in that, the output signal of four road comparers (230) of described trigger pip generating means, be sent to the triggering logical triggering counting and fft algorithm part (550) of controller (500), produce corresponding triggering state and control signal according to the needs of running program by its inner trigger pip treatment state machine.

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