What is a Digital Oscilloscope?
Digital oscilloscope is a high-performance oscilloscope manufactured by a series of technologies such as data acquisition, A / D conversion, and software programming. Digital oscilloscopes generally support multi-level menus, which can provide users with multiple choices and multiple analysis functions. Some oscilloscopes can provide storage to save and process waveforms. At present, high-end digital oscilloscopes mainly rely on American technology. For oscilloscopes with a bandwidth of 300MHz, domestic brands of oscilloscopes can already compete with foreign brands in terms of performance and have obvious cost-effective advantages.
- Chinese name
- Digital oscilloscope
- Foreign name
- Digital oscilloscope
- Use
- Digital waveform display and storage
- Digital oscilloscope is a high-performance oscilloscope manufactured by a series of technologies such as data acquisition, A / D conversion, and software programming. Digital oscilloscopes generally support multi-level menus, which can provide users with multiple choices and multiple analysis functions. Some oscilloscopes can provide storage to save and process waveforms. At present, high-end digital oscilloscopes mainly rely on American technology. For oscilloscopes with a bandwidth of 300MHz, domestic brands of oscilloscopes can already compete with foreign brands in terms of performance and have obvious cost-effective advantages.
Introduction to Digital Oscilloscope :
- Digital Oscilloscope, English: Digital Oscilloscope
- Digital oscilloscopes are an indispensable tool for designing, manufacturing, and servicing electronic equipment. With the rapid development of technology and market demand, engineers need the best tools to quickly and accurately solve the measurement challenges they face. As an engineer's eye, digital oscilloscopes are vital in meeting today's tough measurement challenges. [1]
- Digital oscilloscopes are widely used because of their unique advantages such as waveform triggering, storage, display, measurement, and waveform data analysis and processing. Due to the large performance difference between digital oscilloscopes and analog oscilloscopes, if used incorrectly, a large measurement error will occur, which will affect the test task.
Digital oscilloscope classification:
- Digital storage oscilloscope DSO, Digital Storage Oscilloscope: The signal is digitized and then the waveform is built. It has the function of memory and storage of the observed signal. It can be used to observe and compare single-shot and aperiodic phenomena, low-frequency and slow-speed signals, and different time Observed signal
- Digital Phosphor Oscilloscope (DPO, Digital Phosphor Oscilloscope): It can display the change of signal over a long time through multi-level brightness or color
- Mixed signal oscilloscope MSO, Mixed Signal Oscilloscope: Combines digital oscilloscope's ability to analyze signal details and logic analyzer's multi-channel timing measurement ability, which can be used to analyze digital-analog mixed signal interaction effects
Digital Oscilloscope Basic Concepts
Digital Oscilloscope Bandwidth
- Bandwidth is one of the most important specifications of an oscilloscope. The bandwidth of an analog oscilloscope is a fixed value, while the bandwidth of a digital oscilloscope has two types: analog bandwidth and digital real-time bandwidth. The highest bandwidth that digital oscilloscopes can achieve using sequential or random sampling for repeated signals is the digital real-time bandwidth of the oscilloscope. The digital real-time bandwidth is related to the highest digitized frequency and waveform reconstruction technology factor K (digital real-time bandwidth = highest digitized rate / K) , Generally not directly given as an indicator. From the definition of the two types of bandwidth, it can be seen that the analog bandwidth is only suitable for the measurement of repetitive periodic signals, and the digital real-time bandwidth is suitable for the measurement of repetitive and single-time signals. The manufacturer claims how many megabytes the oscilloscope's bandwidth can reach. In fact, it refers to the analog bandwidth, and the digital real-time bandwidth is lower than this value. For example, TEK's TES520B has a bandwidth of 500MHz, which actually means that its analog bandwidth is 500MHz, and the highest digital real-time bandwidth can only reach 400MHz, which is far lower than the analog bandwidth. Therefore, when measuring a single signal, be sure to refer to the digital real-time bandwidth of the digital oscilloscope, otherwise it will bring unexpected errors to the measurement.
- Bandwidth selection example:
- Known conditions: oscilloscope host 1GHz, probe configuration 1.5GHz, measured signal 200MHz (rise time 500ps).
- Oscilloscope Rise Time = 0.35 / 1GHz = 350ps
- Probe rise time = 0.35 / 1.5GHz = 233ps
- Rise time of the entire measurement system = 350² + 233² = 420ps = 420ps
- Actual measurement system bandwidth = 0.35 / 420 = 833MHz
- Rise time from measured signal = 420² + 500 = 653ps
- Actual measurement error = (653 500) / 500 = 30.6%
Digital oscilloscope sampling rate
- Sampling rate is an important index of digital oscilloscope. Sampling rate is also called digitizing rate. It refers to the number of sampling times of analog input signal per unit time, often expressed in MS / s. If the sampling rate is not enough, aliasing is likely to occur.
- If the input signal of the oscilloscope is a 100KHz sine signal, but the signal frequency displayed by the oscilloscope is 50KHz, what is going on? This is because the oscilloscope's sampling rate is too slow and aliasing occurs. Aliasing means that the frequency of the waveform displayed on the screen is lower than the actual frequency of the signal, or even if the trigger indicator on the oscilloscope is already on, the displayed waveform is still unstable. So, for a waveform of unknown frequency, how to determine whether the displayed waveform has aliased? You can slowly change the sweep speed t / dl to a faster time base to see whether the frequency parameters of the waveform have changed sharply. If it is, it means that waveform aliasing has occurred; or the wobble waveform is at a faster time base. Stabilization also indicates that waveform aliasing has occurred. According to Nyquist's theorem, the sampling rate is at least twice as high as the high frequency component of the signal, so that no aliasing occurs. For example, a 500MHz signal requires a sampling rate of at least 1GS / s. There are several ways to simply prevent aliasing:
- 1. Adjust the sweep speed;
- 2. Use Autoset;
- 3. Try to switch the collection mode to the envelope mode or peak detection mode, because the envelope mode is to find the extreme value in multiple collection records, and the peak detection mode is to find the maximum and minimum values in a single collection record. Either method can detect faster signal changes.
- 4. If the oscilloscope has the Insta Vu acquisition method, you can choose it because it is fast to acquire waveforms. The waveform displayed by this method is similar to the waveform displayed by an analog oscilloscope.
- Relationship between sampling rate and t / dl: The maximum sampling rate of each digital oscilloscope is a fixed value. However, at any scan time t / dl, the sampling rate fs is given by:
- fs = N / (t / dl) N is the sampling point per division
- When the number of sampling points N is a certain value, fs is inversely proportional to t / dl, the larger the scanning speed, the lower the sampling rate. The following is a set of scan speed and sampling data of TDS520B:
- In summary, when using a digital oscilloscope, in order to avoid aliasing, it is best to place the sweep speed in a faster sweep position. If you want to capture fleeting glitches, it is best to set the sweep speed to a slower main sweep speed.
- Storage depth
- Memory depth is also a relatively important technical indicator, a measure of how many sampling points a digital oscilloscope can store. If you need to capture a burst without interruption, you need sufficient oscilloscope memory to capture the entire event. Dividing the length of time you want to capture by the sampling speed required to accurately reproduce the signal, you can calculate the required memory depth, also called the record length. It is not that some domestic second-tier manufacturers claim that the memory depth refers to the longest record of the waveform that can be recorded during waveform recording. "Record length. That's why they don't say that the memory depth is the number of waveform points that can be stored in a real-time acquisition of a waveform under high-speed sampling. The eight-bit binary waveform information after A / D digitization is stored in the oscilloscope's high-speed CMOS memory. The amount of memory (storage depth) is important. For DSO (digital oscilloscope), the maximum memory depth is constant, but the memory length used in actual tests is variable. With a certain storage depth, the faster the storage speed, the shorter the storage time. There is an inverse relationship between them. At the same time, the sampling rate and the time base (timebase) are in a linked relationship, that is, the smaller the time base scale is, the higher the sampling rate is. The storage speed is equivalent to the sampling rate, and the storage time is equivalent to the sampling time. The sampling time is determined by the time represented by the display window of the oscilloscope, so; the storage depth = sampling rate × sampling time (distance = speed × time) due to the level of DSO The scale is divided into 12 divisions, and the length of time represented by each division is the timebase. The unit is s / dl, so the sampling time = timebase × 12. Knowing from the storage relationship: Increasing the storage depth of the oscilloscope can indirectly increase The oscilloscope's sampling rate, when measuring waveforms over a long period of time, can only be achieved by lowering the sampling rate because the storage depth is fixed, but this will inevitably result in a reduction in the quality of the waveform. Measure at high sample rates to obtain undistorted waveforms. For example, when the time base selects a 10us / dl file bit, the sampling time of the entire oscilloscope window is 10us / dl * 12 divisions = 120us. At a storage depth of 1Mpts, the current actual sampling rate is: 1M ÷ 120us8.3GS / s If the storage depth is only 250K, the current actual sampling rate is only 2.0GS / s! The memory depth determines the size of the actual sampling rate. In a word, the memory depth determines the DSO's ability to analyze both high-frequency and low-frequency phenomena, including high-frequency noise of low-speed signals and low-frequency modulation of high-speed signals.
Digital Oscilloscope Rise Time
- In analog oscilloscopes, rise time is an extremely important indicator of an oscilloscope. In digital oscilloscopes, the rise time is not even explicitly given as an indicator. Due to the digital oscilloscope measurement method, the automatically measured rise time is not only related to the position of the sampling point. In addition, the rise time is also related to the sweep speed.
Digital Oscilloscope Calibration System
- With the development of electronic technology, digital oscilloscopes have greatly expanded their working capabilities by virtue of digital technology and software. The early sampling of low sampling rates, large dead time, and low screen refresh rates have been greatly improved. Modulations that were previously difficult to observe are greatly improved. Signals, communication eye diagrams, and video signals are becoming easier to observe. Digital oscilloscopes can perform calculations and analysis on data, and are especially suitable for capturing all the details and abnormal phenomena generated in complex dynamic signals. Therefore, they have been widely used in scientific research and industrial production. In order to make the oscilloscope work in a qualified state, regular, fast and comprehensive verification of the oscilloscope and ensuring its traceability are an urgent task before the test engineer.
- Manual verification has low efficiency and is prone to errors. The verification of each type of oscilloscope requires the test engineer to read a large amount of information. The automatic test system has the characteristics of accurately and quickly measuring parameters, displaying test results intuitively, and automatically storing test data. It is a traditional manual test. The test cannot be reached. It is the trend of instrument verification to realize the program-controlled verification of the oscilloscope with the automatic test system.
- GPIB, VXI, and PXI are standard buses for automatic test systems. GPIB has won user recognition for its stable performance, convenient operation, and low price. GPIB is selected here as the bus of the test system.
How to use digital oscilloscope
- Digital oscilloscopes are widely used because of their unique advantages such as waveform triggering, storage, display, measurement, and waveform data analysis and processing. Due to the large performance difference between digital oscilloscopes and analog oscilloscopes, if used improperly, large measurement errors will occur, which will affect the test task [2] .
- Distinguish between analog and digital real-time bandwidth
- Bandwidth is one of the most important specifications of an oscilloscope. The bandwidth of an analog oscilloscope is a fixed value, while the bandwidth of a digital oscilloscope has two types: analog bandwidth and digital real-time bandwidth. The highest bandwidth that digital oscilloscopes can achieve using sequential or random sampling for repeated signals is the digital real-time bandwidth of the oscilloscope. The digital real-time bandwidth is related to the highest digitized frequency and waveform reconstruction technology factor K (digital real-time bandwidth = highest digitized rate / K) , Generally not directly given as an indicator. From the definition of the two types of bandwidth, it can be seen that the analog bandwidth is only suitable for the measurement of repetitive periodic signals, and the digital real-time bandwidth is suitable for the measurement of repetitive and single-time signals. The manufacturer claims how many megabytes the oscilloscope's bandwidth can reach. In fact, it refers to the analog bandwidth, and the digital real-time bandwidth is lower than this value. For example, TEK's TES520B has a bandwidth of 500MHz, which actually means that its analog bandwidth is 500MHz, and the highest digital real-time bandwidth can only reach 400MHz, which is far lower than the analog bandwidth. Therefore, when measuring a single signal, be sure to refer to the digital real-time bandwidth of the digital oscilloscope, otherwise it will bring unexpected errors to the measurement [2] .
- About the sampling rate
- The sampling rate is also called the digitization rate, which refers to the number of times the analog input signal is sampled per unit time, often expressed in MS / s. Sampling rate is an important indicator of digital oscilloscopes [2] .
- 1. If the sampling rate is not enough, it is prone to aliasing
- If the input signal of the oscilloscope is a 100KHz sinusoidal signal, but the signal frequency displayed by the oscilloscope is 50KHz, what is going on? This is because the oscilloscope's sampling rate is too slow and aliasing occurs. Aliasing means that the frequency of the waveform displayed on the screen is lower than the actual frequency of the signal, or even if the trigger indicator on the oscilloscope is already on, the displayed waveform is still unstable. The generation of aliasing is shown in Figure 1. So, for a waveform of unknown frequency, how to determine whether the displayed waveform has aliased? You can slowly change the sweep speed t / dl to a faster time base to see if the frequency parameters of the waveform have changed sharply. If it is, it means that waveform aliasing has occurred; or the wobble waveform is at a faster time base Stabilization also indicates that waveform aliasing has occurred. According to the Nyquist theorem, the sampling rate is at least twice as high as the high frequency component of the signal, so that no aliasing occurs. For example, a 500MHz signal requires a sampling rate of 1GS / s [2] . There are several ways to simply prevent aliasing:
- Adjust the sweep speed;
- · Autoset is used;
- · Try to switch the collection mode to envelope mode or peak detection mode, because the envelope mode is to find the extreme value in multiple collection records, and the peak detection mode is to find the maximum and minimum values in a single collection record Both methods can detect faster signal changes.
- · If the oscilloscope has the InstaVu acquisition method, it can be used because it is faster to acquire waveforms. The waveform displayed by this method is similar to the waveform displayed by an analog oscilloscope [2] .
- 2.Relationship between sampling rate and t / dl
- The maximum sampling rate of each digital oscilloscope is a fixed value. However, at any scan time t / dl, the sampling rate fs is given by:
- fs = N / (t / dl) N is the sampling point per division
- When the number of sampling points N is a certain value, fs is inversely proportional to t / dl, the larger the scanning speed, the lower the sampling rate [2] .
- In summary, when using a digital oscilloscope, in order to avoid aliasing, it is best to place the sweep speed in a faster sweep position. If you want to capture the transient glitches, it is best to put the sweep speed in a slower position [2] .
- Digital Oscilloscope Rise Time
- In analog oscilloscopes, rise time is an extremely important indicator of an oscilloscope. In digital oscilloscopes, the rise time is not even explicitly given as an indicator. Due to the digital oscilloscope measurement method, the automatically measured rise time is not only related to the position of the sampling point [2] .
- Although the rise time of the waveform is a fixed value, the results measured with a digital oscilloscope are very different due to the different sweep speeds. The rise time of an analog oscilloscope has nothing to do with the sweep speed, while the rise time of a digital oscilloscope is not only related to the sweep speed, but also to the location of the sampling point. When using a digital oscilloscope, we cannot use the analog oscilloscope to reflect the measured time. Infer the rise time of the signal [2] .
Digital Oscilloscope Hardware Design
- The hardware of the GPIB-based digital oscilloscope automatic verification system consists of a GPIB controller, FLUKE5500A, the verified digital oscilloscope, a PC, and peripheral equipment such as a printer.
Digital oscilloscope controller
- GPIB is a practical instrument interface system developed by HP in the late 1960s and early 1970s. Because the control of the test instrument is very convenient and has a high transmission speed (1Mbps), GPIB was established as the IEEE488 standard in 1975 and revised as IEEE488.1-1987 in 1987. GPIB bus is a digital 24-pin parallel bus. There are 8 wires are ground and shielded wires, and the other 16 wires are TTL level signal transmission lines, including 8 data lines, 5 interface management lines and 3 data transmission control lines. . GPIB uses 8-bit parallel, byte serial, and asynchronous communication methods, and all bytes are transmitted sequentially through the bus.
- GPIB system equipment has three attributes: controller, speaker and listener. Actual devices have one, two, or three of them. As the controller, it can specify the device connected to the bus with the speaker attribute as the speaker and the device with the listener attribute as the listener by addressing, including specifying itself. The speaker can send data to other devices via the bus. The listener can receive data from the speaker on the bus. Generally speaking, in the GPIB system, the computer is the controller, with three attributes: speaking, listening, and controlling. To avoid bus conflicts, IEEE488 stipulates that there can be only one speaker at a time, but there can be several listeners at the same time. Because the working speeds of various devices in the GPIB system may be very different, in order to ensure that multi-line messages can be transmitted bidirectionally, asynchronously, and reliably, three handshake lines are set in the GPIB bus, which are data valid lines, unready receive lines, and unreceived To the data line.
- The GPIB controller used in this system is the BC-1401-2 USB-GPIB interface controller developed by Beka Technology. It has a USB interface and converts the USB bus into a GPIB bus to operate GPIB instruments. Its characteristics are: fully comply with IEEE488.1 and IEEE488.2 international standards, support PCI, USB, Ethernet industrial standards; data transmission rate is 900kbps, suitable for high-speed data transmission between PC and instrument; provides a set of I / O GPIB operation function library, its functions are the same as the ES1400 series interface controller of the ISA bus; it provides a set of virtual instrument software architecture VISA (Virtual Instrument Software Architecture) function library that complies with the VPP specification, and realizes all applications developed using VISA functions When changing different types of GPIB interface controllers from different manufacturers, the application does not need to make any changes; the interface controller can use C / C ++, VC ++, VB, LabView, LabWindows / CVI, HP-VEE, Delphi, etc. It is convenient and flexible to compile test programs in multiple languages.
PC Digital Oscilloscope Master PC
- As the "master" of the system, the PC controls the FLUKE5500A and the tested oscilloscope by issuing commands to the GPIB interface controller, which mainly includes the following aspects: instrument initialization, reset, and instrument parameter setting; the command FLUKE5500A generates Standard signals are displayed by the oscilloscope at the same time; read / save the instrument data and transfer it to the PC.
Digital Oscilloscope Software Design
Digital Oscilloscope Platform Selection
- Software is the core of this digital oscilloscope automatic verification system. Whether the software and hardware can work in a stable and coordinated manner is the basis for the system to quickly and reliably verify the digital oscilloscope. This system uses the stable performance Windows2003 Server operating system, SQL Sever2005 (development version) database and Visual. NET2005 as the development platform, C / C ++ as the programming language, and at the same time, NI Labs / CVI7.0 Driver development of some programs. At the same time, MAX (Measurement & Automation) is used as the IVI driver configuration program.
VISAIVI Digital Oscilloscope VISA and IVI
- VISA is an I / O interface software standard formulated by the VXI plug & play alliance. The purpose of formulating VISA is to ensure that instruments from different manufacturers and different interface standards are compatible with each other, and can communicate and exchange data. Its significant features are: VISA is implemented using advanced object-oriented programming ideas; it is a super integration of all current instrument interface types and functions, and is very concise, with only more than 90 functions; VISA as a standard function, and the instrument's I / O interface type is irrelevant, which facilitates program migration. For driver and application developers, VISA library functions are a set of functions that can be easily called and can control various devices such as GPIB, VXI, PXI, etc.
- IVI (Interchangeable Virtual Instrument) is an instrument driver programming interface introduced by the IVI Foundation in order to further improve the executable performance of instrument drivers, achieve instrument interchange in the true sense, and implement applications completely independent of hardware. The IVI system consists of five parts: IVI driver, specific driver, IVI engine, IVI configuration utility, and IVI configuration information file. The class driver implements the encapsulation of the upper-level unified functions, facing the operator, and the specific driver completes the communication with the specific instrument. The test program calls the class driver, and the class driver calls the specific driver to achieve the independence of the test program and hardware. The IVI engine performs status caching, instrument attribute tracking, and classification driver-to-specific driver mapping. The IVI configuration utility program uses software MAX to create and configure IVI logical names. In the test program, the operations are mapped to specific instruments and instrument drivers by transmitting the logical names to a classification driver initialization function. The IVI configuration information file records all logical names and mapping information from class drivers to specific instrument drivers. Its structure is shown in Figure 2.
Digital oscilloscope test architecture
- Test software module:
- The test software is divided into a test data management module, a test parameter management module, and a test program module. The test data management module manages the date of verification of the instrument, the verification personnel, the verified items of the specific instrument, and the verification data. Test parameter management is to manage each test item of the specific instrument and the standard value of the test item in the database. The test program module is based on the test parameters selected by the user on the soft panel, calls the corresponding test instrument for testing, compares the test data with the standards in the database to determine whether it is qualified.
- Test software structured process:
- After starting the system self-test, the calibration operator selects / enters the model of the instrument to be calibrated on the software interface, and the program calls up the corresponding calibration items, standard values of the tested items, the tested instruments and FLUKE5500A Connection diagram of GPIB controller. The inspector connects the instrument according to the connection diagram (FLASH animation). After confirming that the connection is correct, check whether there is an IVI driver. After installing the driver, run the MAX configuration tool. After completing the configuration, you can run the corresponding test program and save the test results. Go to the database and print the corresponding pass / fail report. The flowchart is shown in Figure 3.
- Develop IVI driver:
- For IVI instruments, manufacturers will provide IVI driver programs that require only a small amount of code to implement instrument verification. The main program is simple and easy to manage. The IVI Foundation's goal is to support 95% of instruments. The verification of digital instruments based on IVI technology will be the inevitable way of instrument verification.
- But not all instruments support IVI. For non-IVI instruments, the IVI driver development wizard in LabWindows / CVI is used to encapsulate all low-level commands in the instrument program control command tree into a series of high-level functions with an image panel to complete the development of the IVI driver and make it an IVI instrument. It is characterized by a large workload in the early development of IVI drivers, but a small workload in the development and maintenance of later test procedures.
Digital Oscilloscope Database
- The database management mainly includes six modules: user management, management of the type of the tested instrument, management of the verification project, management of the verification report, management of the verification index of the verification project, and data query.
Digital oscilloscope application examples
- The test system set up by this method was used to verify IVI instruments Hp54815, etc., and IVI drivers were developed for non-IVI instruments XJ4321, etc., and its vertical sensitivity, transient response, steady state response, scan time factor error, and scan time factor were linear. Perform verification with 5 errors, save the verification result, and print the verification certificate. Practice has proved that the verification process becomes fast and simple; the results of automatic verification and manual verification are consistent.
- The digital oscilloscope verification system introduced in this article uses GPIB as the bus, and uses IVI technology and database technology to realize the automatic verification of the digital oscilloscope. It has the characteristics of convenient operation, strong expandability, and good working stability. Instrument, arbitrary waveform / function generator, digital multimeter automatic verification system for comprehensive digital instruments provides a reference.
Advantages and disadvantages of digital oscilloscope
: Digital oscilloscope advantages:
- 1. Small size, light weight, easy to carry, LCD display
- 2. It can store waveforms for a long time, and can perform various operations and analysis on the stored waveforms.
- 3. Particularly suitable for measuring single and low frequency signals. There is no analog flicker phenomenon when measuring low frequency signals.
- 4. More trigger methods, in addition to the pre-trigger that analog oscilloscopes do not have, there are logic triggers, pulse width triggers, etc.
- 5. Can connect with computer, printer, plotter through GPIB, RS232, USB interface, can print, archive and analyze files
- 6. Has powerful waveform processing capabilities, can automatically measure many parameters such as frequency, rise time, pulse width, etc.
: Disadvantages of digital oscilloscopes :
- 1. The distortion is relatively large, because the digital oscilloscope displays the waveform by sampling. The smaller the number of sampling points, the larger the distortion. Usually there are 512 sampling points in the horizontal direction, which is limited by the maximum sampling rate. There are fewer sampling points and therefore greater distortion at high speeds.
- 2. Poor ability to measure complex signals. Due to the limited number of sampling points of the digital oscilloscope and no change in brightness, many waveform details cannot be displayed. Although some may have two or more brightness levels, this is only a difference in a relative sense. Coupled with the limited display resolution of the oscilloscope, it still cannot reproduce the effect of the analog display.
- 3. There may be artifacts and confusing waveforms. When the sampling clock frequency is lower than the signal frequency, the displayed waveform may not be the actual frequency and amplitude. The bandwidth of a digital oscilloscope is closely related to the sampling rate. When the sampling rate is not high, interpolation calculation is needed, which is prone to confusing waveforms.
Digital Oscilloscope Well-known Products
Tektronix Digital Oscilloscope
- Tektronix TDS1000B digital oscilloscope is a digital oscilloscope launched by Tektronix Technology Co., Ltd. with a bandwidth of up to 100 MHz and a sampling rate of up to 1 GS / s, and has a lightweight design and economical features. The portable standard features of the TDS1000B series digital oscilloscope include USB connection Capabilities, 12 automatic measurements, simple user interface, context-sensitive help, probe check wizard, and lifetime warranty. [3]
Digital oscilloscope
- SIGLENT is the world's largest manufacturer of digital oscilloscopes and is the largest oscilloscope manufacturer in China.
- The international R & D concept creates a more powerful SDS1000CFL series with more humane operation! Adhering to the multifunctional and high performance of Dingyang products, this product provides up to four channels and an external trigger input channel, which can simultaneously capture and display multiple signals to meet the application requirements of product development and verification. At the same time, the product is equipped with a sampling rate of up to 2GSa / S and a 7-inch color TFT LCD liquid crystal screen, which meets the testing requirements of higher bandwidth and higher sampling rate in complex hardware designs. The single-channel 24K memory depth is ahead of domestic similar products, with longer signal observation time and deeper insight into signal details. Powerful triggering and analysis capabilities make it easy to capture and analyze waveforms, greatly improving test efficiency. The rich interface configuration realizes seamless connection with the PC to meet the processing needs of waveform data and quickly set up a test system.
Fluke Digital Oscilloscope
- FLUKE5500A is a high-performance multifunctional calibrator from Fluke Corporation in the United States.It can calibrate handheld and desktop multimeters, oscilloscopes, oscilloscopes, power meters, electronic thermometers, data collectors, power harmonic analyzers, and process calibration. And other instruments for calibration. FLUKE5500A provides three standard interfaces: GPIB (IEEE-488), RS-232, and 5725A; in terms of security, it meets IEC 1010-1 (1992-1), ANSI / ISA-S82.01-1994, CAN / CSA-C22 .2NO.1010.1-92 standard; FLUKE5500A output voltage can reach 1100V, current output can reach 11A, can provide a variety of waveforms and harmonics of DC voltage and current, AC voltage and current, and simultaneously output two voltages, or one voltage And a current, analog power, resistance, capacitive thermocouple and RTD. Its oscilloscope calibration kit also provides amplitude stabilized sine waves, fast edges, time stamps, and amplitude signals.
Digital Oscilloscope Technical Parameters
|
|
|
| |
|
|
|
|
|
|
| |||
|
| |||
|
| |||
|
| |||
|
|
|
|
|
|
|
| ||
|
|
|
|
|
| ||||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
|
| |||
Digital Oscilloscope References
- [1] Lab Windows / CVI Instrument Driver Developer Guide [Z]. Agilent 2003 Edition 370699A-01.
- [2] NI. Lab Windows / CVI Programmer's reference manual [P]. Austin (USA), 1998.
- [3] The VISA library [M]. VXI Plug & Play System Alliance, Austin (USA), 1998.
- [4] 5500A Multi-Product Calibrator Programmer Reference Guide [M], Fluke Corporation, 1999.
- [5] Zhang Yigang. Automatic test system [M]. Harbin: Harbin Institute of Technology Press, 2001.
- [6] Li Shijun. Modern Database System and Application Tutorial. Wuhan: Wuhan University Press, 2005, 1.