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IEEE Transactions on Instrumentation and Measurement

Issue 1 • March 1969

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Displaying Results 1 - 17 of 17
  • [Front cover]

    Publication Year: 1969, Page(s): c1
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  • IEEE Instrumentation and Measurement Group

    Publication Year: 1969, Page(s): c2
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  • Table of contents

    Publication Year: 1969, Page(s): 1
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  • Wheatstone Bridge Sensitivity

    Publication Year: 1969, Page(s):2 - 6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (898 KB)

    One of the important properties of a bridge is the sensitivity of the unbalance voltage to changes in some bridge parameter. In the self-balancing bridge, the uniformity of the null sensitivity, as well as the peak value of sensitivity, is relevant. The sensitivity of the four-arm Wheatstone bridge is reexamined from this point of view, with particular regard to the problem of the interchange of t... View full abstract»

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  • VHF and UHF Attenuation Measurements to 140 dB

    Publication Year: 1969, Page(s):7 - 15
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2005 KB)

    A system has been assembled for rapid comparison of production step attenuators, with a reference attenuator using direct substitution at spot frequencies in the VHF and UHF range. The total attenuation range for such tests is 140 dB, with a basic resolution of ±0.01 dB and with maximum errors of ±0.08 dB, attributable, primarily, to reflection inaccuracies. Simplified methods for measurement to... View full abstract»

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  • A Probability Density Analyzer

    Publication Year: 1969, Page(s):15 - 18
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1434 KB)

    An inexpensive probability analyzer is designed for the measurement of the probability density function and distribution functions of random signals. The operation principle of the system is explained through detailed discussion of each active stage. It utilizes Schmitt triggers with low hysteresis to provide good accuracy. The output of the analyzer is measured by using a counter. Experimental pr... View full abstract»

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  • Millisecond Switch for Electroexplosive Testing

    Publication Year: 1969, Page(s):19 - 22
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (787 KB)

    A simple and reliable one-shot switch operating in the millisecond range is described. Closure is by mercury contacts that can pass 5 amperes with very small voltage drop. The apparatus is particularly useful in the study and testing of electroexplosive devices. View full abstract»

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  • A Tunable Resonator with Constant Rate of Trimming

    Publication Year: 1969, Page(s):22 - 27
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1018 KB)

    An inductor connected to a bridge of five capacitors forms a single-resonant circuit in which the natural frequency can be set independently (almost) by two separate controls. Such a resonator is useful in amplifiers and oscillators that need to be tuned to many separate frequencies. This arrangement is particularly advantageous when the frequency must be preset in a digital manner, as in a decade... View full abstract»

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  • A Directional Analyzer for Ion and Electron Velocity Distributions

    Publication Year: 1969, Page(s):27 - 31
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2876 KB)

    The two basic difficulties usually encountered in multigrid retarding-potential analyzers have been identified and effectively overcome. The frequently experienced difficulty with such probes caused by the continually changing work function of metal surfaces due to a more or less evanescent sorption of ions has been eliminated by coating the nickel surfaces with a bonded graphite dispersion that l... View full abstract»

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  • A Heterodyne Near-Zone Field-Strength Meter

    Publication Year: 1969, Page(s):32 - 37
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2949 KB)

    This paper describes a tunable field-strength meter covering the 12-30-MHz range, which can be used to measure electric intensities from 0.1 to 1000 V/m in the near zone of an antenna with an estimated uncertainty of ±2 dB. The use of high-resistance plastic telemetry lines enables the field to be probed without disturbance, while a novel detector circuit and meter enable a 40-dB display with min... View full abstract»

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  • Measurement of Microphonic Noise

    Publication Year: 1969, Page(s):38 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2745 KB)

    In the course of designing an airborne radar system, there is inevitably a requirement that the equipment does not generate microphonic noise over a specified level. The level of interest can be such that accurate measurement can be difficult. This paper compares three measuring systems: a simple microwave bridge system, the commercially available Allscott system, and a coherent system conceived a... View full abstract»

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  • A High-Accuracy Computer-Aided Profile-Measuring Machine

    Publication Year: 1969, Page(s):49 - 57
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1443 KB)

    This paper describes a system for the high-precision, rapid measurement and evaluation of rotatable object profiles such as cam's. The data are acquired off-line by sampling with a high-resolution optical encoder and are recorded on magnetic tape via an incremental recorder. The recorded data are subsequently analyzed by a computer program to provide the required parameters. The system is characte... View full abstract»

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  • Analysis of a Simplified Radar Simulator for Measuring Probability of Detection

    Publication Year: 1969, Page(s):58 - 62
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (919 KB)

    This paper describes a simplified radar target simulator that can approximate the output of a pulse radar receiver so that the detection capabilities of amplitude-sensing video target detection devices can be measured. The simplified simulator uses only video frequency components; therefore, its output is not identical to that from a radar. However, an analysis of the simulator output gives the pr... View full abstract»

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  • A Method for Compensation of Thermal Drift of Ferromagnetic Current Comparator

    Publication Year: 1969, Page(s):63 - 65
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (486 KB)

    The current comparator using a ferromagnetic core has several merits especially for application to current A-D converters. Because the comparator utilizes the coercive force of the core to give the threshold value to the performance, drift errors cannot be neglected if the ambient temperature changes. An electronic compensation method for drift and experimental results are described. The temperatu... View full abstract»

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  • Contributors

    Publication Year: 1969, Page(s):66 - 68
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  • IEEE Instrumentation and Measurement Group

    Publication Year: 1969, Page(s): 68a
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  • Invitation for Papers

    Publication Year: 1969, Page(s): 68-b
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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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Editor-in-Chief

SHERVIN SHIRMOHAMMADI
School of EECS
University of Ottawa
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