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IEEE Transactions on Instrumentation and Measurement

Issue 2 • June 1981

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Displaying Results 1 - 23 of 23
  • Table of contents

    Publication Year: 1981, Page(s): 1
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  • [Inside front cover]

    Publication Year: 1981, Page(s): c2
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  • A high-quality digital filter instrument

    Publication Year: 1981, Page(s):93 - 97
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1814 KB)

    A high-quality real-time low power dissipation 12-bit low-pass digital-filter instrument is described. It is a hardware version of a recently proposed multirate ladder structure which can be implemented entirely without digital multipliers. The frequency response of the filter is user programmable and is determined by an operating sequence stored in a read-only memory. A numerical technique is des... View full abstract»

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  • Multichannel digital ventilated psychrometer using eight-bit microcomputer

    Publication Year: 1981, Page(s):98 - 102
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1173 KB)

    A multichannel digital ventilated psychrometer using an 8-bit microcomputer has been developed. It offers the advantages of direct reading of the relative humidity (RH) and the temperature from the digital indicator (or the CRT indicator) as well as multichannel use. The sensing of humidity is based on the psychrometric principle by two integrated circuit (IC) temperature transducers acting as dry... View full abstract»

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  • A new approach to digital frequency synthesis

    Publication Year: 1981, Page(s):102 - 106
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1220 KB)

    Presents a new technique of synthesizing frequencies in steps of 1 Hz from 1 to 399999 Hz. The synthesized waveform is a symmetrical square wave and transistor-transistor logic (TTL) compatible. The algorithm used for the synthesis allows for very efficient use of digital implementation of the system. The complete system consists of an input device, a BCD/binary converter, a binary divider, a digi... View full abstract»

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  • The double dual-slope multiplier: Elimination of offset

    Publication Year: 1981, Page(s):106 - 113
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1626 KB)

    The double dual-slope multiplier is a multiplying analog-to-digital converter based on the dual-slope integrating converter. The ratio of the product of two unknown voltages to the square of a reference voltage is obtained in terms of the ratio of a measured time interval to a known time interval. Offset errors, which are the main source of error, are described and a modification which greatly red... View full abstract»

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  • Capacitive transducer for accurate displacement control

    Publication Year: 1981, Page(s):114 - 123
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2836 KB)

    The underlying theory, design, and operation are presented for an interdigitated capacitive displacement transducer supported on an air-bearing stage. This device provides a purely electrical means of displacement measurement and offers the possibility of being closely matched to the substrate against thermal perturbations. Tests on a prototype system show the basic capacitive transducer to have a... View full abstract»

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  • Microprocessor-controlled acquisition system for the determination of MOS transistor parameters

    Publication Year: 1981, Page(s):124 - 128
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1018 KB)

    Discusses a microprocessor-controlled data acquisition system for automated acquisition of MOS transistor parameters. The Analog Signal Processor and the Control Interface Circuit are described. Finally, the authors explain the procedure of parameter determination based on the least squares estimation criterion. This procedure is applied to long-channel, surface-channel, enhancement-mode PMOS tran... View full abstract»

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  • CMRR performance limits of analog multiplexers using normal-mode filters

    Publication Year: 1981, Page(s):129 - 132
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    An analysis of the common-mode rejection (CMR) of low-level analog multiplexers using normal-mode filters is presented. The CMR is shown to be limited by the multiplexer bus capacitance. Simple analytical expressions are presented for predicting the CMR performance of these multiplexers. View full abstract»

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  • Phase-coherent synthesis and precision frequency measurements in the far infrared

    Publication Year: 1981, Page(s):132 - 138
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1565 KB)

    A short review of the basic concepts and problems in frequency multiplication into the infrared region of the electromagnetic spectrum is given. Results obtained with a multiplier chain starting from 5 MHz are reported. The carrier collapse is found at a frequency of about 15 THz. The present state of technological development is illustrated and the inherent limitations of this technique are indic... View full abstract»

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  • Effect of the worked layer in quartz-crystal plates on their frequency stabilities

    Publication Year: 1981, Page(s):139 - 143
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1243 KB)

    Describes the direct measurement of the relation between the worked layers in quartz-crystal plates and their effect on the frequency stability. The rectangular fundamental 5-MHz AT-cut specimen plates lapped and polished with emery powder and cerium oxide, respectively, were placed in gap-type holders and connected with oscillator circuits, and their frequency stabilities were measured. Th... View full abstract»

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  • Single shunt fault diagnosis in a resistive ladder

    Publication Year: 1981, Page(s):143 - 146
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1078 KB)

    The problem of locating a single shunt fault in a uniform resistive ladder network is considered. A simple method, based on resistance measurements is proposed for the case where the total number of nodes is small and all of them are accessible. Two strategies are discussed for reducing the number of measurements when the number of nodes is large but all nodes are still accessible. When internal n... View full abstract»

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  • Analytical and experimental approaches for the design of low-distortion Wien bridge oscillators

    Publication Year: 1981, Page(s):147 - 151
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1150 KB)

    Although Wien bridge oscillators are commonly used as fixed-frequency generators of low distortion there has apparently not been suggested a simple systematic method based on nonlinear theory for reducing their distortions. This paper attempts at filling the gap. This is achieved by suggesting a network which is on the one hand a Wien bridge oscillator and it can be also regarded as a Van der Pol ... View full abstract»

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  • Network analysis by phase-modulated homodyne detection

    Publication Year: 1981, Page(s):152 - 154
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (996 KB)

    The network analyzer method using the homodyne detection principle and a sawtooth or stepped phase modulation can be generalized for an arbitrary phase-modulating function. The adjustment of the phase deviation of the modulated signal yields an exactly linear dependence between the phase of the microwave signal and the phase of the fundamental intermediate frequency signal at the mixer output. View full abstract»

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  • A new 2-kV common-mode voltage wide-band isolation amplifier

    Publication Year: 1981, Page(s):155 - 156
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (869 KB)

    Describes a new modulation-demodulation technique for isolation amplifiers, particularly useful for multichannel data acquisition systems. Input and output stages are transformer coupled using an improved version of the amplitude-modulation technique of a symmetric square wave, which requires a simple rectifier bridge for demodulation. Characteristics of the isolation stage obtained in this way ar... View full abstract»

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  • Dynamics of the heterodyne spectrum analyzer with rectangular bandpass filter

    Publication Year: 1981, Page(s):157 - 160
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (934 KB)

    A mathematical model of the dynamic frequency characteristics of the heterodyne spectrum analyzer with a rectangular bandpass filter of small relative bandwidth is constructed. The model is investigated numerically and proved experimentally. View full abstract»

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  • An active frequency meter

    Publication Year: 1981, Page(s):160 - 162
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (762 KB)

    Deals with the theory and fabrication of a new frequency meter, which is used for the measurement of frequency in the range from a few hertz to 100 kHz. It is a frequency-selective bridge and is made of discrete passive R and C components and an integrated operational amplifier. At bridge balance, the frequency under measurement is given in terms of the values of resistors and capaci... View full abstract»

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  • A simple technique for precise voltage control of oscillator frequencies

    Publication Year: 1981, Page(s):162 - 165
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (967 KB)

    A proportional feedback control scheme is proposed to obtain a precise linear relationship between the control voltage and the frequency of oscillators. Experimental results agree closely with the theory. The scheme is simple in circuitry, versatile, and suitable for mass production. View full abstract»

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  • A decade range linearly tunable versatile filter

    Publication Year: 1981, Page(s):165 - 167
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (543 KB)

    A modified version of the Kerwin-Huelsman-Newcomb biquad is presented which is electronically tunable almost linearly over a decade range of center frequency. The circuit is suitable for use as a tunable universal filtering module and can be easily digitally programmed. View full abstract»

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  • A dipole detuning technique for proximity and thickness measurements

    Publication Year: 1981, Page(s):168 - 169
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2280 KB)

    Experimental results are presented which demonstrate that both the magnitude and phase of the input reflection coefficient of a dipole placed near a conducting plane are sensitive monotonic functions of the dipole-to-plane separation. Measurement applications which exploit this characteristic are suggested. View full abstract»

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  • Contributors

    Publication Year: 1981, Page(s):169 - 173
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  • [Advertisements]

    Publication Year: 1981, Page(s):174 - 175
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  • [Advertisements]

    Publication Year: 1981, Page(s): 176
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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.

Full Aims & Scope

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