IEEE Transactions on Instrumentation and Measurement

Issue 3 • Aug. 1972

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Displaying Results 1 - 25 of 27
  • [Front cover]

    Publication Year: 1972, Page(s): c1
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  • IEEE Instrumentation and Measurement Group

    Publication Year: 1972, Page(s): c2
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  • Table of contents

    Publication Year: 1972, Page(s): 185
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  • Errors in the Parallel Connection of a 100 : 1 Series-Parallel Buildup of Four-Terminal Resistors

    Publication Year: 1972, Page(s):186 - 197
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2143 KB)

    This paper deals with the problem of calculating the parallel resistance of a 100: 1 series-parallel buildup of four-terminal resistors with accuracy as high as possible. A rather complex equivalent circuit has been assumed, taking into account all the causes of significant errors. Then a complete calculation has been carried out for obtaining all the error terms expressed by means of 15 relativel... View full abstract»

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  • A Measuring Method for MOST Transconductance and Its Variation

    Publication Year: 1972, Page(s):198 - 204
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1507 KB)

    A precise method is given for measuring the transconductance of an MOS transistor (MOST) and also its value and rate of variation. The measuring setup uses a differential amplifier, in which the output voltage of a sample MOST operated as a common-source amplifier is compared with the reference voltage derived from the attenuators used as a standard, and also a synchronous demodulator, with which ... View full abstract»

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  • Cavity Pulling in Passive Frequency Standards

    Publication Year: 1972, Page(s):204 - 209
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1143 KB)

    Assuming a Lorentzian shape for the atomic line, we calculate the cavity-pulling factors of passive frequency standards, taking into account the modification of the applied electromagnetic field by the atomic radiation. The calculation is therefore valid for all values of the gain of the atomic medium and gives, in particular, the cavity-pulling factor when the oscillation threshold is approached.... View full abstract»

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  • Shaping Fast Rise-Time Pulses with Tapered Transmission Lines

    Publication Year: 1972, Page(s):209 - 214
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2596 KB)

    For the purpose of checking very fast time-domain reflectometer (TDR) systems it is desirable to have a fast rise-time pulse whose parameters are known. A means for obtaining pulses meeting these requirements has been achieved by suitably tapering the inner conductor of a rigid coaxial transmission line having air dielectric, commonly referred to as an air line. The air line is driven with a pulse... View full abstract»

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  • Method of Measuring Millimeter Waveguide Line Attenuation

    Publication Year: 1972, Page(s):215 - 219
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1529 KB)

    The shuttle-pulse method has been used to measure the attenuation characteristics of the circular waveguide for millimeter-wave transmission. However, the measured results by the shuttle-pulse method cannot avoid some errors when there are periodic imperfections along the waveguide axis. To remove this shortcoming the pulse single-reflection method was developed in the Electrical Communication Lab... View full abstract»

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  • The Direct-Detection Noise-Measuring System and Its Threshold

    Publication Year: 1972, Page(s):219 - 224
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1385 KB)

    This paper describes a typical direct-detection noise-measuring system, with particular attention given to the use of Schottky-barrier diodes as envelope detectors. The rise of threshold at low modulation frequencies encountered in these systems has been found to be mainly attributable to FM-to-AM conversion occurring in comparatively narrow-band detectors rather than to diode-flicker noise and th... View full abstract»

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  • Stability Analysis of New High-Stability Square-Wave Generator

    Publication Year: 1972, Page(s):224 - 234
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1878 KB)

    An original solution of the system for generating high stable frequency of square-wave oscillation using an RC bridge network as the timing element is given. The high stability of the system is based on the property of self-compensation. With respect to the action of external factors (voltage supply or temperature changes), the system provides a correlation between the variation in two neighboring... View full abstract»

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  • An Elegant Method for Measuring MOST Drain-Source Conductance in the Saturated Current Region

    Publication Year: 1972, Page(s):234 - 236
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (431 KB)

    An elegant method is presented for measuring the drain-source conductance of an MOST operating in the saturated current region. The measuring setup allows measurement of the drain-source conductance ranging from 10-3 to 1 mU with a sensitivity of less than 0.1 percent at a frequency of 1 kHz and also measurement of the variation rate in the drain-source conductance in excess of 0.2 percent. The lo... View full abstract»

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  • Time-Domain Techniques for Measuring the Conductivity and Permittivity Spectrum of Materials

    Publication Year: 1972, Page(s):237 - 243
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2037 KB)

    A method is presented for evaluating the conductivity and permittivity spectrum of materials by using time-domain reflectometry. A theoretical analysis of the transient response is made, with emphasis on the asymptotic behavior for large values of time. The results of the asymptotic analysis are the basis of the presented method and are essential for the evaluation of the permittivity spectrum of ... View full abstract»

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  • The Effect of Wire Length and Separation on X-Array Hot-Wire Anemometer Measurements

    Publication Year: 1972, Page(s):244 - 248
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (853 KB)

    This paper describes a simple method for the calculation of errors due to the finite length and separation of X-array hot-wire anemometers. Results of computations for a typical wire array are presented for total and spectral turbulence measurements. Although the actual errors are slightly underestimated due to the simplifying assumptions used to reduce the computational effort, it is found that t... View full abstract»

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  • A Differential Transformer with Temperature- and Excitation-Independent Output

    Publication Year: 1972, Page(s):249 - 255
    Cited by:  Papers (26)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1227 KB)

    This paper describes a new concept for compensating for sensitivity changes of a differential transformer due to variations in temperature and excitation conditions. The idea is based on utilization of the individual outputs from the secondary coils, not only as a differential output but also as a reference output. The differential transformer usually has two secondary coils connected in oppositio... View full abstract»

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  • The Direct Digital Measurement of Low-Pass Noise Power

    Publication Year: 1972, Page(s):255 - 258
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (958 KB)

    A direct digital method of measuring the noise power in a low-pass random waveform is described. The input-output relationship and the sensitivity of the digital detector are determined. Direct digital measurement of noise power offers a number of advantages in the instrumentation of radiometers and other noise-measuring systems. View full abstract»

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  • The Calibration of a Precision Potentiometer Using a Minimum of Special-Purpose Equipment

    Publication Year: 1972, Page(s):259 - 263
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (762 KB)

    A method of calibrating a potentiometer, at the part-per-million level with a minimum of special-purpose equipment, is described. The technique is illustrated by application to a particular instrument with numerical values drawn from a particular calibration. The required accuracies are shown to be attainable with usual laboratory equipment. View full abstract»

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  • Nationwide Precise Time and Frequency Distribution Utilizing an Active Code within Network Television Broadcasts

    Publication Year: 1972, Page(s):263 - 276
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3304 KB)

    Because of the increasing interest in time and frequency dissemination via television signals, the National Bureau of Standards (NBS) has sponsored an experiment using an active time and frequency code transmitted on a U. S. television network encompassing nationwide coverage. Some history of the project is given. The format of the television code and the equipment necessary to generate and decode... View full abstract»

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  • Crystal-Controlled Oscillators

    Publication Year: 1972, Page(s):277 - 286
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1881 KB)

    Crystal-controlled oscillators are commonly used to provide the stable frequencies required for electronic communications, navigation, and data processing systems. Depending upon the frequency of operation, ambient conditions, and specific oscillator design, crystal-controlled oscillators are capable of providing frequency stability varying from about 1 × 10-4 to 1 × 10-11 over time periods rang... View full abstract»

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  • Determination of Complex Dielectric Constant of High-Loss Materials

    Publication Year: 1972, Page(s):286 - 287
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (423 KB)

    A noncontacting measurement system for determining com-plex values of dielectric constant from measured values of complex reflection coefficient is described. A convenient graphical method for relating real and imaginary parts of dielectric constant to measured values and errors in the measured values of reflection coefficient is given. View full abstract»

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  • Measurement of Electrostatic Potential below HV Lines

    Publication Year: 1972, Page(s):287 - 288
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (481 KB)

    A simple method of measuring the induced 60-Hz electric potential in points near HV lines is described. The free potential is related to the charging current of a grounded conducting sphere placed in the field. Measured and calculated values of potential agree well. View full abstract»

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  • The Kirchhoff Data Link

    Publication Year: 1972, Page(s):288 - 291
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (849 KB)

    A system is introduced for the acquisition of analog or digital data from a large number of remote sensors and its transmission and collection at a central processing facility. The system features buffering or impedance matching of the signal source, fundamental noise immunity to radiated and ground noise, integral power supplied along the signal lines, as well as fundamental ease of signal switch... View full abstract»

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  • Further Possibilities of the Modulated Subcarrier Technique for Microwave Attenuation Measurements in Industrial Applications

    Publication Year: 1972, Page(s):291 - 293
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (759 KB)

    In this paper a microwave system for attenuation measurement by means of the modulated subcarrier method supplying additional information on the actual parameters of the system is described. The information can be used for automatic control of output signal indicator sensitivity making the results independent of the instability of these parameters. Experimental results are reported illustrating th... View full abstract»

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  • A New Sample Interpolator of Linear Type

    Publication Year: 1972, Page(s):293 - 294
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    A new data processor is presented giving a precise approximation to linear interpolation. The processor produces a staircase waveform with a constant and high number of steps connecting two consecutive samples. The implementation of the interpolator is described and some test results are given. View full abstract»

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  • Time-Synchronized Ranging System

    Publication Year: 1972, Page(s):294 - 300
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1898 KB)

    This paper describes a time-ordered precision ranging system, identified as time synchronized ranging system (TSRS). The TSRS is a cooperative ranging system serving up to 1024 users within an operational community. Synchronization of time, relative to a designated controller, is established and maintained to less than 7 ns. Slant range measurements between users and controller are provided with a... View full abstract»

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  • Contributors

    Publication Year: 1972, Page(s):301 - 304
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    Freely Available from IEEE

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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SHERVIN SHIRMOHAMMADI
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