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IEEE Transactions on Instrumentation and Measurement

Issue 3 • Sept. 1987

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Displaying Results 1 - 25 of 39
  • Table of contents

    Publication Year: 1987, Page(s): 1
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    Freely Available from IEEE
  • [Inside front cover]

    Publication Year: 1987, Page(s): c2
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  • State of the transactions - A final report

    Publication Year: 1987, Page(s): 705
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    Freely Available from IEEE
  • Announcing 1986 Prize Paper Award

    Publication Year: 1987, Page(s): 706
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    Freely Available from IEEE
  • A high-performance variable sampling clock generator for the nearest neighbor sampling technique

    Publication Year: 1987, Page(s):707 - 710
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1515 KB)

    A variable sampling clock generator for two-dimensional image sampling is proposed that features very small point error in each scan line, fast frequency switching from one scan line to another, and phase coherency at sampling starting on each scan line. The sampling clock is generated by dividing a stable high-frequency master clock by integer values stored in a simplified master-clock divider RO... View full abstract»

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  • A novel digital phase meter

    Publication Year: 1987, Page(s):711 - 716
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1156 KB)

    A simple digital phase meter using the dual-slope principle is described. It gives a digital output number independent of the input frequency or the clock frequency used for the measurement process. The meter performs its measurement within two cycles of the input wave. View full abstract»

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  • A high-performance digital phase comparator

    Publication Year: 1987, Page(s):717 - 720
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (826 KB)

    A digital phase comparator has been developed that is especially well suited to making precision phase measurements at high frequency. The circuit consists of two standard phase comparators that are interconnected so that their outputs are averaged to give the desired phase measurement. A clipping circuit consisting of back-to-back Schottky diodes is used to square up the output pulses, which impr... View full abstract»

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  • A phase-measurement offset compensation technique suitable for automation

    Publication Year: 1987, Page(s):721 - 724
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    DC offsets degrade the measurement of phase between two sinusoidal signals when the zero-crossing method is used. To improve the measurement accuracy, a novel offset compensation technique is introduced that is suitable for use in automated instruments. The technique is based on calculating the average value of two phase angles: one is between the offset crossings of increasing signals and the oth... View full abstract»

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  • A current-tunable sinusoidal oscillator

    Publication Year: 1987, Page(s):725 - 729
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2968 KB)

    A high-performance integrable current-tunable sinusoidal oscillator is proposed and experimentally investigated. A current-tunable bandpass filter is used as the frequency-determining network. Practical frequency-sweep ranges of approximately three orders of magnitude have been obtained. The maximum useful frequency of oscillation is in excess of 20 mHz, and the total harmonic distortions can be a... View full abstract»

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  • A voltage-doubling method for measuring the voltage dependence of compressed gas capacitors

    Publication Year: 1987, Page(s):730 - 734
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1014 KB)

    A commercially available transformer-ratio-arm capacitance bridge is used two different circuits to measure the voltage dependence of a capacitor by comparing it with a second compressed-gas capacitor, the voltage dependence of which need not be known. Measurements have been carried out at power frequency with an experimental setup for voltages up to 50 kV. A maximum uncertainty of six parts in 10... View full abstract»

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  • Accuracy limitations in measurement of space link parameters

    Publication Year: 1987, Page(s):735 - 742
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1510 KB)

    A discussion is presented on accuracy limitations in the measurement of satellite communication link parameters, with particular regard to manual or automated communication surveillance systems which have been developed for international or domestic satellite systems. The measurement accuracy of a given space link parameter is derived from its equation for the total error bound. The accuracy is a ... View full abstract»

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  • Design of multiple input/output modal analysis instrumentation

    Publication Year: 1987, Page(s):743 - 749
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1623 KB)

    A flexible measurement system has been developed to implement recently developed experimental dynamic analysis techniques. The system consists of a modular front-end and a mini- or microcomputer. Several modules for automated signal conditioning and data acquisition as well as for programmable signal generation are available. A software interface package simplifies the development of application p... View full abstract»

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  • A digital recorder for lightning current waveforms

    Publication Year: 1987, Page(s):750 - 754
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (897 KB)

    An improved lightning current recorder having an efficient analog-to-digital-conversion method is described. To distinguish between multiple lightning strokes which typically follow each other at about 30 ms intervals, the dead-time (the time required to down-load samples) has been reduced by discarding redundant information. With a maximum sampling rate of 5 megasamples per second and 6-bit linea... View full abstract»

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  • New comparator-type calibrator for instrument transformers

    Publication Year: 1987, Page(s):755 - 758
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    The principle of a novel comparator-type calibrator is described. It consists of a conventional current comparator-based high-precision current transformer calibration device with an additional current comparator and a current-voltage conversion circuits. The measuring range of the current is extended by the current comparator and that of the voltage by the resistances. View full abstract»

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  • Linear composite resistance thermometers

    Publication Year: 1987, Page(s):759 - 762
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (793 KB)

    The theory of a composite resistance thermometer, consisting of platinum in series with a second metal which will compensate the nonlinear resistance-versus-temperature characteristic of the platinum, is developed. Gold and rhodium are suggested for the second metal. The theory and advantages of the approach, which uses overcompensation of the curvature of platinum plus subsequent linearization by... View full abstract»

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  • A novel wide range linearization approach for thermistor thermometer

    Publication Year: 1987, Page(s):763 - 769
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1793 KB)

    A logarithmic function for response linearization of the thermistor thermometer is presented. A theoretical study of the proposed scheme is presented. A novel and inexpensive circuit configuration for realizing the proposed logarithmic function is described. The approach offers linear temperature/voltage conversion over a wide dynamic range with an output that is independent of fluctuations in the... View full abstract»

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  • Optimization of the dynamic behavior of a SQUID system using an electronic simulation

    Publication Year: 1987, Page(s):770 - 775
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1236 KB)

    A theoretical analysis is given of the dynamic behavior of a SQUID system operating in a feedback mode. In order to optimize the system with respect to stability, frequency response, and slew rate, an electronic system which simulates the periodic transfer function of the SQUID sensor by a good approximation was used. View full abstract»

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  • The influence of receiver cross-modulation on attainable HF radar dynamic range

    Publication Year: 1987, Page(s):776 - 782
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1393 KB)

    The performance of an HF radar system should ideally be limited by environmental factors as opposed to instrumental limitations. In this study the influence of one such limitation, receiver cross-modulation, is quantitatively assessed. An expression is derived for the attainable dynamic range, relating it to the receiver's linearity and the signal environment in which it is required to operate. In... View full abstract»

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  • Linear FM chirp filters in pulse compression radars

    Publication Year: 1987, Page(s):783 - 788
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1074 KB)

    Using a complex Fresnel integral algorithm, the authors extend results of other authors from a time-bandwidth product of 50 up to 720. They analyze a rectangular linear FM filter having a 300-MHz center frequency, 120-MHz bandwidth, and 6-μs dispersion time T. Two different methods of rectangular FM cosine square tapering are compared. In the first method, the tapers are of length View full abstract»

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  • Power level controlled optical sweep oscillator using a GaAs semiconductor laser

    Publication Year: 1987, Page(s):789 - 796
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1747 KB)

    A frequency-tunable semiconductor laser having a power level controller has been developed. The laser frequency is locked to a piezoelectrically modulated interferometer having a free spectral range of 5 GHz and tuned by varying its mirror gap. A servoloop for this purpose is connected to the injection current source of the laser diode. The level of the output power is stabilized by a second servo... View full abstract»

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  • A fully automatic critical slew rate tester for thyristors

    Publication Year: 1987, Page(s):797 - 801
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2676 KB)

    The author describes a critical slew rate (dv/dt) test method for thyristors (p-n-p-n switches). A voltage-controlled ramp function generator has been developed with an adjustable slew rate. The maximum voltage is 400 V and the maximum slew rate is 3000 V/μs. For high-speed measurements, a novel method, denoted as the after-firing method, is developed which reduces the measure... View full abstract»

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  • The gas-filled thermal converter as a precise AC-DC transfer standard for all the AC quantities

    Publication Year: 1987, Page(s):802 - 809
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3213 KB)

    A novel thermal converter based on a gas-filled thermometer covered by a flat strap resistor (in place of the usual wire resistor-thermocouple combination) is presented. The basic principle on which the thermal convertor is based is illustrated. Test results obtained on a prototype have shown that the converter responds to the square of its heater current. In a specific arrangement AC-DC transfer ... View full abstract»

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  • Characterization of metals as EMC shields

    Publication Year: 1987, Page(s):810 - 814
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1529 KB)

    The authors describe a test fixture and method used for about five years to characterize the shielding performance of both monometallic and composite sheets, over a frequency range of 50 Hz-300 kHz, with effectiveness values up to 90 dB. Calculation methods were developed to permit extrapolation of the test results to different geometries and wave impedance; data are presented showing the correlat... View full abstract»

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  • Configuration of microcomputer-based instrumentation systems measuring mass consumption of fuel gas

    Publication Year: 1987, Page(s):815 - 823
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1725 KB)

    The measurement of the mass consumption of fuel gas over a specified period of time is discussed. The various configurations of microcomputer-based instrumentation which may be used for this measurement are reviewed. Relationships expressing the overall measurement error as a function of the accuracies of the sensors used in each configuration are derived. On the basis of these relationships a met... View full abstract»

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  • Modeling and measurement of airgap harmonics of single-phase induction motors

    Publication Year: 1987, Page(s):824 - 829
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2006 KB)

    The air-gap harmonic frequencies of a single-phase squirrel-cage induction motor are studied analytically using the permeance method. This approach delivers detailed information about the air-gap harmonic frequencies, corresponding pole pairs, and the originating mechanisms, such as excitation, slotting, or saturation. In order to verify this analysis, experimental measurements are carried out on ... 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