IEEE Transactions on Instrumentation and Measurement

Issue 4 • Dec. 1988

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Displaying Results 1 - 25 of 38
  • Electronic compensation of voltage transformers

    Publication Year: 1988, Page(s):652 - 654
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (210 KB)

    A method for compensating ratio errors and phase displacements of measuring voltage transformers by a simple electronic circuit is introduced. This electronic compensator keeps the primary winding isolated from the secondary winding, so that it can be applied to voltage transformers in any kind of use. It also works with large load power variations. With this compensation, smaller and cheaper tran... View full abstract»

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  • A modular and innovative software package for multichannel data acquisition

    Publication Year: 1988, Page(s):493 - 496
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A software package called Acquire is described which can control multichannel data acquisition equipment, collect and archive the data, analyze and present results in user-defined plot formats, and link together the individual tasks of a repetitive experiment to produce a fully automated turn-key solution. It is concluded that the modular structure of the described software can be customized quick... View full abstract»

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  • GPIB and the battle of incompatible languages

    Publication Year: 1988, Page(s):488 - 492
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    The author outlines what the IEEE 488.1 and 488.2 standards cover with regard to operating language, what specifications are available, and detailed instructions on how to design a language which facilitates user tolerance. Various features of language design are considered, including mnemonics, minimum uniqueness, the command table, the required characters table, the offset table, and search rout... View full abstract»

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  • A high speed data acquisition and analysis system for ultrasonic energy measurements

    Publication Year: 1988, Page(s):515 - 518
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A high-speed microcomputer-based data acquisition and analysis system was designed and constructed. The system was interfaced to an ultrasound sector scanner. The primary application of the system, in this case, was to measure the power spectrum of the backscattered (low-level) ultrasound signal from acoustic inhomogeneous media, such as liver tissue. The system was bench-tested and then tested su... View full abstract»

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  • Accurate digital control and rotation of the phase of microwave signals

    Publication Year: 1988, Page(s):626 - 630
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A method of remotely controlling the phase and phase rates of low-frequency reference signals using digital techniques is described. These signals can, in turn, be used to control the phase of a microwave local oscillator in a phase array. The system, which was designed to control the phase of the local oscillators in a radio astronomy array called the Australian Telescope, gives phase resolution ... View full abstract»

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  • Single-mode fiber measurements

    Publication Year: 1988, Page(s):557 - 560
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The author discusses the various techniques used to characterize the following transmission parameters of single-mode fibers: attenuation, cutoff wavelength, mode-field diameter, and chromatic dispersion. The cutback method, the insertion-loss method, and optical time-domain reflectometry are considered for attenuation measurements. The single-band and power step methods are considered for cutoff-... View full abstract»

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  • Voice technology in the instrumentation of the automobile

    Publication Year: 1988, Page(s):586 - 590
    Cited by:  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The author discusses the applications of voice technology in modern automobiles. A major goal of this technology is to add artificial intelligence to the instruments of the vehicle to improve the safety and reliability of the vehicle. Two aspects of speech technology are discussed, namely, speech synthesis and speech recognition. Speech synthesis is mainly used to generate verbal warning messages ... View full abstract»

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  • A power system digital harmonic analyzer

    Publication Year: 1988, Page(s):537 - 540
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    The authors describe the design of a harmonic analyzer for use in studying the harmonic content of commercial electric power. This MC 68000-based instrument samples the waveform and calculates the first 63 harmonics of the 60-Hz fundamental for both a voltage and current waveform. The 64-kbyte memory is adequate for one week of hourly samples for a power-quality survey by an electrical utility. Th... View full abstract»

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  • Logtone crest factors

    Publication Year: 1988, Page(s):656 - 657
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    The Schroeder and random methods are compared with a time-frequency-domain swapping algorithm for the crest-factor reduction of logtones used in 1/3 octave analysis. The theoretically stated tendency of logtone-crest factors to grow with the square root of the logarithm of the number of components is confirmed experimentally. This dependence also holds for optimally compressed logtones View full abstract»

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  • Interfacing sensor assemblies with windowless cockpit displays

    Publication Year: 1988, Page(s):501 - 505
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    An interface for converting aircraft instrument information into a video display was created. Due to the limited development time available, the interface was divided into two subsystems. The goal of the division was to allow concurrent work on two major system components. The division used greatly aided the development, test, and calibration tasks. The key to being able to develop and test them s... View full abstract»

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  • Personal computer flexible multichannel interface for data acquisition of low-frequency signals

    Publication Year: 1988, Page(s):510 - 514
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The authors describe the structure and give the hardware/software implementation of a multichannel interface card which takes one slot of an IBM PC or compatible computer and enables the PC to perform the data acquisition and storage of signals to be measured. Because of the flexibility of components used in building the card, the user can select, using the keyboard, several operational parameters... View full abstract»

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  • Frequency switching speed measurements using a delay line discriminator

    Publication Year: 1988, Page(s):620 - 625
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Frequency switching speed (FSS) measurements around 3 GHz are presented, using a delay line discriminator (DLD). A relation is derived that governs the quasistatic condition for the transfer function of the DLD. Under the quasistatic condition, the transformation of the DLD output signal to the transient frequency of the input signal requires only harmonic functions in the mathematical transformat... View full abstract»

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  • A variable temperature test station for extraction of semiconductor device modeling parameters

    Publication Year: 1988, Page(s):610 - 614
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The authors describe the equipment and software necessary to integrate a variable-temperature setup and an automated data-collection system to extract semiconductor device modeling parameters over a wide temperature range. A cryogenic test station with a temperature range of 1.8-300 K is used for semiconductor device evaluation, with the test structure mounted in an 8-pin, TO-99-style header. The ... View full abstract»

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  • A high performance, variable capacitance accelerometer

    Publication Year: 1988, Page(s):569 - 571
    Cited by:  Papers (7)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A variable capacitance acceleration sensor is described. Manufactured using silicon microfabrication techniques, the sensor uses a midplane, flat plate suspension, gas damping, and overrange stops. The sensor is assembled from three silicon wafers, using anodic bonds to inlays of borosilicate glass. Typical sensor properties are 7-pF active capacitance, 3-pF tare capacitance, a response of 0.05 pF... View full abstract»

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  • Determination of DC motor transients using a microcomputer

    Publication Year: 1988, Page(s):600 - 604
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A method is presented to determine DC motor transients using an 8085-based microcomputer. The scheme was tested in the laboratory and results verified. The step response and the back electromotive force (EMF) constant have been determined for a small permanent-magnet DC micromotor. The results have been cross-checked with those obtained from a storage oscilloscope and the specifications of the man... View full abstract»

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  • A comparative worst-case error analysis of some proposed six-port designs

    Publication Year: 1988, Page(s):552 - 556
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A detailed analysis of the accuracy in complex-reflection coefficient measurement by the six-port technique is discussed. The expression of the relative error in amplitude measurement of the complex reflection due to power-reading errors are derived in worst-case situation using both the basic six-port and sensitivity analysis theories. The precision of measurement of any point in the Smith chart ... View full abstract»

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  • A digitally programmable temperature controller based on a phase-locked loop

    Publication Year: 1988, Page(s):582 - 585
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A digitally programmable temperature controller is developed based on a phase-locked loop. Temperature under control is converted to frequency form and then compared, in a phase detector, with the reference frequency which corresponds to the target temperature. The detected phase drives the actuator. The frequency difference is also detected by a one-chip microcomputer which changes the reference ... View full abstract»

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  • A drift-compensating precision divider technique using circular data patterns

    Publication Year: 1988, Page(s):533 - 536
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    A divider is described which is able to provide precision integer-to-one ratios (or those ratios nearby). The technique for using the divider compensates for most of the drift associated with resistive dividers. Data acquisition and reduction are based on flexible circular data patterns. An application of the divider is described where it is used to establish the relationship between 10-V solid-st... View full abstract»

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  • A recent nationwide comparison of single mode optical fiber attenuation measurements

    Publication Year: 1988, Page(s):655 - 656
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    An interlaboratory measurement comparison was conducted by the Shanghai Institute of Testing Technology in China. Four single-mode fibers, having lengths of 6, 2, 2, and 1.6 km, were used. Measurements of attenuation at 1.3 μm and 1.55 μm gave one standard-derivation spread of 0.01, 0.02, 0.03, and 0.02 dB/km at 1.3 μm and 0.01, 0.09, 0.06, and 0.05 dB/km at 1.55 μm View full abstract»

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  • CALIBRAT: a software for control and calibration of electronic measurement devices

    Publication Year: 1988, Page(s):497 - 500
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    CALIBRAT is a software package designed to facilitate quality assurance plan implementation, particularly in the French military establishment. CALIBRAT is intended to be used for a quality assurance plan for measurement devices (mainly multimeters). It includes a high-level language for writing control and calibration procedures and a result database for analysis. Complementary tools like operato... View full abstract»

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  • Impact of digital signal processing on measurement and test instruments

    Publication Year: 1988, Page(s):519 - 524
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The authors discuss the impact of digital signal processing on test instruments and describe the use of a single-chip digital signal processor called TriStar whose architecture has been tailored for the instrumentation environment. TriStar instructions and programming are described, and attention is given to typical applications of TriStar, including averaging, fast Fourier transform, and interpol... View full abstract»

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  • Technique for measuring the dielectric constant of thin materials

    Publication Year: 1988, Page(s):631 - 636
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A practical technique for measuring the dielectric constant of vegetation leaves and similarly thin materials is presented. A rectangular section of the leaf is placed in the transverse plane in rectangular waveguide, and the magnitude and phase of the reflection coefficient are measured over the desired frequency band using a vector network analyzer. By treating the leaf as an infinitesimally thi... View full abstract»

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  • Measurement of launching efficiency into multimode optical fibers using semiconductor laser diodes

    Publication Year: 1988, Page(s):561 - 563
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    A detailed and systematic study has been carried out of the launching efficiency of light, from semiconductor laser diodes into graded-index multimode optical fiber waveguides. Four different terminations of the fibers were investigated: plane-ends, hemispherical ends, taper-with-hemisphere ends, and roof-top (RT) ends. Besides launching efficiency, the parameters of interest were the various misa... View full abstract»

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  • Measuring and fitting the MOS transistor at high frequencies

    Publication Year: 1988, Page(s):591 - 595
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A novel small-signal model of a MOS transistor is presented, which is valid at frequencies around the unity gain frequency. As a major advantage compared with earlier models, this novel model takes into account the nonquasistatic and transmission-line effects of the transistor. By using S-parameter measurements, computer-controlled calibration techniques of the test setup and network anal... View full abstract»

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  • Measurement of instantaneous losses in switching power devices

    Publication Year: 1988, Page(s):541 - 546
    Cited by:  Papers (14)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    A novel technique is proposed for measuring instantaneous power and energy losses in static switching devices during the different operating intervals (turn-on delay, rise time, on-state, turn-off delay, full time, and off-state) of a switching cycle. To this end, a system for measuring voltages and currents is used, based on sampling at 200 Ms/s for data acquisition. The data are then transferred... View full abstract»

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Aims & Scope

Papers are sought that address innovative solutions to the development and use of electrical and electronic instruments and equipment to measure, monitor and/or record physical phenomena for the purpose of advancing measurement science, methods, functionality and applications.

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Meet Our Editors

Editor-in-Chief

SHERVIN SHIRMOHAMMADI
School of EECS
University of Ottawa
800 King Edward Ave.
Ottawa, Ontario
K1N 6N5 CANADA
Fax: 613-562-5664
shervin@discover.uottawa.ca