The Experts below are selected from a list of 33255 Experts worldwide ranked by ideXlab platform

Ian Hickman - One of the best experts on this subject based on the ideXlab platform.

  • How Oscilloscopes work (2): circuitry
    Oscilloscopes, 2000
    Co-Authors: Ian Hickman
    Abstract:

    This chapter describes several circuits of Oscilloscopes, along with their advantages and disadvantages. A block diagram of a typical dual trace, high-performance Oscilloscope is presented. Two identical input channels A and B are switched alternately to a common amplifier, which drives a delay line. The chapter presents two of the basic circuit “building blocks” used in Oscilloscopes. The long-tailed pair is widely used in both forms shown, the second being especially common in analog integrated circuits. It provides balanced push-pull outputs, even if only one input terminal is driven. The cascode circuit can be seen to consist of a common-emitter stage with a common-base stage as its collector load. Oscilloscope designers frequently make use of the advantages of both the long-tailed pair and the cascode.

  • How Oscilloscopes work (1): the c.r.t.
    Oscilloscopes, 2000
    Co-Authors: Ian Hickman
    Abstract:

    This chapter deals with the high-performance c.r.t.s using electrostatic deflection, used in nonstorage Oscilloscopes. Such an Oscilloscope may also include a digital storage capability and the same c.r.t. is then used for both the conventional real-time display and for the storage mode display. Many logic analyzers and some Digital Storage oOscilloscopes (DSOs) use magnetically deflected c.r.t.s either monochrome or color. This is the type of display technology used in TV sets. In c.r.t. storage Oscilloscopes, the cathode ray tube is basically similar to the electrostatically deflected type of tube. The cathode ray tube is the main component of an Oscilloscope. It consists of an electrode assembly mounted in an evacuated glass vessel. The deflection plates of a c.r.t. are connected to amplifiers, which can be of relatively simple design when the required output amplitude is low; it is therefore desirable for the tube sensitivity to be as high as possible. Writing speed is also an important feature. On the occasions when it is necessary to compare several fast, single shot phenomena occurring simultaneously, the only solution is to use an Oscilloscope equipped with a c.r.t. with several beams. Several different types of tubes are also described in this chapter.

  • 6 – Sampling Oscilloscopes
    Oscilloscopes, 2000
    Co-Authors: Ian Hickman
    Abstract:

    Publisher Summary This chapter discusses sampling Oscilloscopes that have gained acceptance due to their capabilities. These scopes offer certain advantages over ordinary real-time scopes. Sampling scopes were introduced in the late 1950s and offered unheard-of bandwidth compared with real-time Oscilloscopes of the day. In the latter, by using a “distributed amplifier” consisting of many valves effectively harnessed in parallel, and restricting the c.r.t.'s Y deflection range to just four divisions against the eight provided as standard nowadays, a bandwidth of 85 MHz was achieved. Sampling Oscilloscopes led to instruments with bandwidths of 14 GHz in the early 1970s. The main requirement for a sampling Oscilloscope is a circuit capable of accurately sampling the input waveform at regular intervals. Controls are provided to delay the sampling pulses so that any desired portion of the signal can be observed.

  • Digital sampling Oscilloscopes
    Digital Storage Oscilloscopes, 1997
    Co-Authors: Ian Hickman
    Abstract:

    The maximum sampling rate of digital storage Oscilloscopes (DSOs) has increased enormously over the years from a few hundred kilosamples per second to 5Gs/s, which at the time of writing currently represents the state of the art. This performance enables a user to capture a waveform with significant energy at frequency components up to 1GHz on a single shot basis, or a sinewave at the full 1GHz bandwidth of the input circuitry on an Oscilloscope without using equivalent time sampling and therefore with no danger of a misleading display because of aliasing. The main requirement for a sampling Oscilloscope is a circuit capable of accurately sampling the input waveform at regular intervals. The similarity between the earlier sampling Oscilloscope and the modern digital sampling Oscilloscope is so great that the greater part of this chapter is taken up with describing the way in which the basic original sampling Oscilloscope works. The digital sampling Oscilloscope is virtually the same animal, but with provision for digitizing the samples.

  • Digital storage Oscilloscope modes of operation
    Digital Storage Oscilloscopes, 1997
    Co-Authors: Ian Hickman
    Abstract:

    Some modes of operation of a digital storage Oscilloscope—such as refresh—are similar to the operating modes of an analog Oscilloscope, while others such as roll mode have no corresponding counterpart. There is much competition between the designers and manufacturers of digital storage Oscilloscopes (DSOs) to produce an instrument which handles like, and gives a display virtually indistinguishable from, an analog Oscilloscope. One of the modes of operation of a digital storage Oscilloscope which has no counterpart in an analog Oscilloscope is roll mode, and this is the first mode to be described in this chapter devoted to digital storage Oscilloscope modes of operation. The chapter describes roll mode first not because it is the most useful mode but because it has been available on DSOs from the earliest stage, it is fundamentally different from a conventional scope display, and it leads nicely to the other operating modes of digital storage Oscilloscopes.

Ye Peng - One of the best experts on this subject based on the ideXlab platform.

  • Design and implementation of 250MSPS wireless smart virtual Oscilloscope
    2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI), 2017
    Co-Authors: Huang Wuhuang, Ye Peng, Pan Zhixiang, Gao Jian, Chang Haozhe, Qiu Duyu
    Abstract:

    In this paper, a novel high-efficient and full-function virtual Oscilloscope is proposed and developed. The method exploits fully the advantages of smart terminal and wireless communication to extend the application of traditional digital Oscilloscope. An Android based smart terminal device is used as the center of data processing in the Oscilloscope. Meanwhile, Wi-Fi based wireless network is applied to achieve high-speed data transmission and fast system controlling between signal acquisition front-end and smart terminal. Combined with the advantage of multithread technique in smart terminal system, a solution of fluency data processing and system controlling is designed. In addition, in order to match different screen resolutions, an adaptive pixel matching method is proposed for optimal waveform and interface display effect. Finally, we achieved a dual-channel 200MSPS smart virtual Oscilloscope featuring a full-function, small-size, low-power and good user's experience. It also makes the traditional Oscilloscope more intelligent and expands the application field of traditional digital Oscilloscope.

  • a transplantable software design method for the deep storage function of digital Oscilloscope
    IEEE International Conference on Electronic Measurement & Instruments, 2015
    Co-Authors: Hao Zeng, Wuhuang Huang, Ye Peng
    Abstract:

    Conventional Oscilloscope software is developed in a “top-to-down” design mode, namely, the overall software architecture is designed firstly. In such a mode, the software modules are divided from the operation and display level, not corresponding to hardware modules. Therefore, the software cannot be implanted together with hardware modules during implantation. In this Paper, the author puts forward a “down-to-top” design idea for the deep storage function of Oscilloscopes; specifically, with the aim of transplantability, software module is designed from the angle of hardware. After hardware structure and functions of Oscilloscope and deep storage module are thoroughly analyzed, deep storage general interface function library is designed and verified in engineering.

  • research on technology of intelligent trigger for digital storage Oscilloscope
    Instrument Technique and Sensor, 2010
    Co-Authors: Wang Houjun, Pan Huiqing, Ye Peng
    Abstract:

    To meet the testers' need of capturing and observing the incidental or abnormal signals mixed in the cycle signal,this paper presented an intelligent triggering method for digital storage Oscilloscope.First it analyzed the traditional test method was.inefficient and limited measurements and other drawbacks,and then introduced the intelligent triggering of the design plan,work processes and technological advantages,the core of which is the programmable trigger templates which can be arbitrarily set and judged by hardware in real-time.Finally,the technology was applied to a type of digital storage Oscilloscopes and the application of verification results was given.Tests show that the technology has a high efficiency to capturing occasional,abnormal event,is a useful complement for the function of Oscilloscope waveform capture.

Shu Lin Tian - One of the best experts on this subject based on the ideXlab platform.

  • a seamless acquisition digital storage Oscilloscope with three dimensional waveform display
    Review of Scientific Instruments, 2014
    Co-Authors: Kuojun Yang, Shu Lin Tian, Hao Zeng, Lei Qiu, Lianping Guo
    Abstract:

    In traditional digital storage Oscilloscope (DSO), sampled data need to be processed after each acquisition. During data processing, the acquisition is stopped and Oscilloscope is blind to the input signal. Thus, this duration is called dead time. With the rapid development of modern electronic systems, the effect of infrequent events becomes significant. To capture these occasional events in shorter time, dead time in traditional DSO that causes the loss of measured signal needs to be reduced or even eliminated. In this paper, a seamless acquisition Oscilloscope without dead time is proposed. In this Oscilloscope, three-dimensional waveform mapping (TWM) technique, which converts sampled data to displayed waveform, is proposed. With this technique, not only the process speed is improved, but also the probability information of waveform is displayed with different brightness. Thus, a three-dimensional waveform is shown to the user. To reduce processing time further, parallel TWM which processes several sampled points simultaneously, and dual-port random access memory based pipelining technique which can process one sampling point in one clock period are proposed. Furthermore, two DDR3 (Double-Data-Rate Three Synchronous Dynamic Random Access Memory) are used for storing sampled data alternately, thus the acquisition can continue during data processing. Therefore, the dead time of DSO is eliminated. In addition, a double-pulse test method is adopted to test the waveform capturing rate (WCR) of the Oscilloscope and a combined pulse test method is employed to evaluate the Oscilloscope's capture ability comprehensively. The experiment results show that the WCR of the designed Oscilloscope is 6 250 000 wfms/s (waveforms per second), the highest value in all existing Oscilloscopes. The testing results also prove that there is no dead time in our Oscilloscope, thus realizing the seamless acquisition.

  • Study on the Smart Handheld Wireless Oscilloscope
    Applied Mechanics and Materials, 2013
    Co-Authors: Jun Jiang, Shu Lin Tian
    Abstract:

    As the digital acquisition system is featured by increasingly higher technical targets and more complicated applicable conditions, the traditional digital Oscilloscope has become incapable of meeting the requirements of real-time processing of sampled data and waveform display on one hand, and unqualified for field test in hard risky conditions on the other. This paper aims for comprehensively enhancing the digital Oscilloscopes data processing, image display, human-machine interface and portable adaptability. To that end, it approaches the system composition of improved Oscilloscope, and renders a chance to wirelessly connect the Oscilloscope with any of the Smart Handheld Devices with Android operation system through the added wireless data interactive channel, which forms a smart handheld wireless Oscilloscope. Such Oscilloscope adopts the divisional coordination between data acquisition system and Smart Handheld Device to greatly improve data processing, waveform display and HMI, and realize wireless operation of remote test as a result.

  • a method of improving signal capture ability of digital Oscilloscope
    Advanced Materials Research, 2013
    Co-Authors: Jun Jiang, Shu Lin Tian
    Abstract:

    Signal capture is one of the hot spots in electronic test. As the representative of testing instrument, the signal capture ability of digital Oscilloscope is normally judged by the waveform capture rate. Unilaterally improving signal acquisition ability whereas ignoring the improvement of waveform imaging mechanism and display effect can not increase the Oscilloscopes waveform capture rate in real sense. Aiming at better ability of signal acquisition and waveform display effect of Oscilloscope, this paper is committed to analyzing the improved structure of Oscilloscope and conducting the real-time waveform imaging with hardware coprocessor array, and then studying the imaging mechanism of special 3D waveform and the impact of waveform display on waveform capture rate. In this way, the signal capture ability of Oscilloscope is greatly improved and the effective waveform capture rate as high as 1,000,000 wfms/s is realized.

Mark Bieler - One of the best experts on this subject based on the ideXlab platform.

  • optoelectronic time domain characterization of a 100 ghz sampling Oscilloscope
    Measurement Science and Technology, 2012
    Co-Authors: Heiko Fuser, Sascha Eichstadt, K Baaske, Clemens Elster, K Kuhlmann, Rolf Judaschke, K Pierz, Mark Bieler
    Abstract:

    We have carried out an optoelectronic measurement of the impulse response of an ultrafast sampling Oscilloscope with a nominal bandwidth of 100 GHz within a time window of approximately 100 ps. Our experimental technique also considers frequency components above the cut-off frequency of higher order modes of the 1.0 mm coaxial line, which is shown to be important for the specification of the impulse response of ultrafast sampling Oscilloscopes. Additionally, we have measured the reflection coefficient of the sampling head induced by the mismatch of the sampling circuit and the coaxial connector which is larger than 0.5 for certain frequencies. The uncertainty analysis has been performed using the Monte Carlo method of Supplement 1 to the 'Guide to the Expression of Uncertainty in Measurement' and correlations in the estimated impulse response have been determined. Our measurements extend previous work which deals with the characterization of 70 GHz Oscilloscopes and the measurement of 100 GHz Oscilloscopes up to the cut-off frequency of higher order modes.

Nicholas G Paulter - One of the best experts on this subject based on the ideXlab platform.

  • Temperature Effects on the High Speed Response of Digitizing Sampling Oscilloscopes | NIST
    2000
    Co-Authors: Donald R. Larson, Nicholas G Paulter
    Abstract:

    We describe the effects of temperature on the performance of 20 GHz and 50 GHz digital sampling Oscilloscopes and high speed pulse generators. The temperature of the sampling heads is varied through the manufacturer’s specified minimum operating temperature range (15 “C to 35 “C) and the corresponding changes in the measured pulse amplitude, top level, base level, and transition duration (rise time) of a step-like pulse are presented. We also describe the effects of temperature on the pulses produced by two reference step generators commonly used to perform Oscilloscope calibrations. Some of the measured changes with temperature are quite large.

  • a fast pulse Oscilloscope calibration system
    Instrumentation and Measurement Technology Conference, 1998
    Co-Authors: J P Deyst, Nicholas G Paulter, Tamas Daboczi, Gerard N Stenbakken, T M Souders
    Abstract:

    A system is described for calibrating high-bandwidth Oscilloscopes using pulse signals. The fast-pulse Oscilloscope calibration system (FPOCS) is to be used to determine the step response parameters for digitizing Oscilloscopes having bandwidths of /spl sim/20 GHz. The system can provide measurement traceability to standards maintained at the U.S. National Institute of Standards and Technology (NIST). It comprises fast electrical step generation hardware, a personal computer (PC) and software, and a reference waveform, i.e., a data file containing an estimate of the step generator output signal. The reference waveform is produced by prior measurement by NIST of the step generator output signal (calibration step signal). When the FPOCS is in use, the calibration step signal is applied to the device under test, which is an Oscilloscope sampling channel. The measured step waveform is corrected for timebase errors, then the reference waveform is deconvolved from it. The results are impulse, step, and frequency response estimates, and their associated parameters (e.g., transition duration, transition amplitude, -3 dB bandwidth) and uncertainties. The system and its components are described, and preliminary test results are presented.