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IEEE Transactions on Instrumentation and Measurement

Issue 4 • Nov. 1972

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Displaying Results 1 - 25 of 61
  • Table of contents

    Publication Year: 1972, Page(s):c1 - 8b
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  • IEEE Instrumentation and Measurement Group

    Publication Year: 1972, Page(s): c2
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  • [Advertisement]

    Publication Year: 1972, Page(s):nil1 - 306
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  • IEEE G-IM-An Invitation

    Publication Year: 1972, Page(s): 305
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  • Foreword

    Publication Year: 1972, Page(s):307 - 308
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  • CPEM '72 in Retrospect Editorially

    Publication Year: 1972, Page(s): 309
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  • Recent NPL Work on the AC Josephson Effect as a Voltage Standard

    Publication Year: 1972, Page(s):310 - 314
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1294 KB)

    The experimental equipment and procedure used in the latest National Physical Laboratory (NPL) ac Josephson effect determinations of 2e/h are described. The most recent value, obtained in April 1972, is 483 594.00 (±0.10) GHZ/VNPL and this, together with earlier results, provides information concerning the stability of the NPL maintained voltage standard over the past two years. To obtain a furth... View full abstract»

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  • Recent Progress of the 2e/h Measurement at PTB

    Publication Year: 1972, Page(s):314 - 315
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (387 KB)

    In this paper, an experimental setup is described with which the stability of the PTB voltage standard, consisting of a group of International Weston cells, can be monitored with a total uncertainty (1σ) of 4 parts in 108 by means of the ac Josephson effect. The measured quotient of the fundamental constants 2e/h is given by 2e/h = (483 593.606 ± 0.020) GHZ/VPTB, May 1972. View full abstract»

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  • Summary of International Comparisons of As-Maintained Units of Voltage and Values of 2e/h

    Publication Year: 1972, Page(s):316 - 319
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (969 KB)

    Using temperature-regulated transportable standard-cell enclosures, the National Bureau of Standards (NBS), under the auspices of the Bureau International des Poids et Mesures (BIPM), during the period June 1971 through June 1972 has carried out a series of direct comparisons of the units of voltage as-maintained by NBS and BIPM, Sÿvres, France; the National Physical Laboratory, United Kingdom; t... View full abstract»

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  • Standard cells with Cd-Pb amalgam electrode

    Publication Year: 1972, Page(s):319 - 323
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (949 KB)

    In order to improve the characteristics of standard cells, those containing composite amalgam electrode have been studied. The criterion and test procedures established for selecting high-quality standard cells have been applied. The addition of Pb to Cd amalgam has the effect of reducing the temperature coefficient. The most appropriate composition of amalgam is that of 10 wt % Cd, 3-9 wt % Pb, a... View full abstract»

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  • A High-Accuracy Digital Instrument Design for DC Measurements

    Publication Year: 1972, Page(s):323 - 328
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1823 KB)

    A high-accuracy self-calibrating digital instrument design has been developed in order to make available the inherent efficiency advantages of conventional digital meters, but without their limitations in accuracy, reliability, or certifiability. The new instrument can extend the advantages of automation to many testing, quality control, and standards laboratories where heretofore only high-qualit... View full abstract»

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  • High-Precision Digital Volt Ratiometer by a Method of Measuring Difference of Magnetic Field among Three Windings

    Publication Year: 1972, Page(s):329 - 333
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    The purpose of this work is to establish a highly accurate automatic ratio measuring instrument for dc voltage and resistance. In voltage and resistance ratio measurements, accuracy of 0.1 ppm has now become necessary due to recent developments in quantum metrology. To obtain the accuracy, we have just developed a technique to automatically compensate the measuring error caused by the deviation of... View full abstract»

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  • Theoretical Analysis of the AC/DC Transfer Difference of the NPL Multijunction Thermal Convertor over the Frequency Range DC to 100 kHz

    Publication Year: 1972, Page(s):334 - 340
    Cited by:  Papers (28)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1502 KB)

    Measurements of the rms values of alternating currents are frequently made by means of thermal transfer instruments. At low and midfrequencies Thomson heating can have an important influence on the ac/dc transfer difference of these devices, whereas at higher frequencies the variation with frequency of the effective resistance of their heaters is the most decisive factor. The present paper examine... View full abstract»

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  • Wide-Band Two-Stage Current Transformers of High Accuracy

    Publication Year: 1972, Page(s):340 - 345
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2041 KB)

    The design and performance of two high-accuracy transformers, identified as amplifier-aided two-stage transformers, are described. Each operates from 50 Hz to 10 kHz, supporting burdens up to 1 Ω. Self-contained ratios span from 5/5 to 100/5, with a rated secondary current of 5 A. Results indicate the errors at 10 kHz are within 30 and 15 ppm for the respective transformers, decreasing to ... View full abstract»

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  • A New Digtal Method for DC-Current Measurement with Floating Input

    Publication Year: 1972, Page(s):346 - 349
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    This paper describes a new method for direct-current measurement without direct connection to the circuit under test, producing a time-coded indication. A magnetizable ring core with three separate windings is driven to positive and negative saturation by a triangular alternating current. The voltage induced in the detector winding is differentiated. The time interval between two zero-axis crossin... View full abstract»

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  • Electronic Method with Direct Time Encoding for Precision Measurement of Electric Power over a Wide Range of Frequency

    Publication Year: 1972, Page(s):350 - 353
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (605 KB)

    The principle of power measurement by thermal means has the advantage of a very large bandwidth and gives the possibility to realize time or frequency encoding in a simple way. The new method described is based on a known operation using special thermal converters with several heaters. The multiple heating, however, is done by a multiplexing operation on single-heater converters. It is shown that,... View full abstract»

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  • An Evaluation of the Three-Voltmeter Method for AC Power Measurement

    Publication Year: 1972, Page(s):353 - 357
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (945 KB)

    The accuracy and frequency response limitations in the present square-law responding laboratory wattmeters have promoted the search for alternate methods of ac power measurement using electronic instrumentation. The three-voltmeter method is based on an old principle of operation implemented by new analog circuitry. Results of the tests reported here show a precision of power calculation with 0.01... View full abstract»

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  • Low-Frequency Electrical Signal Measurement by Electrooptical Methods

    Publication Year: 1972, Page(s):358 - 360
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    An analog system for the optical telemetry of voltage or current information using light-emitting diodes (LED) is described. Errors resulting from variations in the optical coupling efficiency are minimized because the light emitted by the LED contains the signal to be measured superimposed on a fixed intensity beam controlled by a reference zener diode. The nonlinearity of the LED is overcome by ... View full abstract»

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  • NPL Calculable Capacitor

    Publication Year: 1972, Page(s):361 - 365
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2148 KB)

    The NPL calculable cross capacitor is designed to provide a standard of the highest accuracy. It has a vertical axis and the length is determined by central guard tubes. The length is altered by axial displacement of the lower tube and the change is measured interferometrically. This paper describes the construction and performance of the capacitor and records the results of the initial measuremen... View full abstract»

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  • Phase-Angle Characteristics of Cross Capacitors

    Publication Year: 1972, Page(s):365 - 368
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (815 KB)

    It has been found that under proper conditions thin dielectric films on the electrodes of certain types of cylindrical cross capacitors tend only to produce equal and opposite contributions to the phase angles of the two cross capacitances. To a lesser degree, this same type of cancellation effect has been found to be associated with toroidal cross capacitors. View full abstract»

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  • An Optimized Design for a Low-Frequency Inductive Voltage Divider

    Publication Year: 1972, Page(s):368 - 372
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (905 KB)

    A theoretical investigation of the causes of error in multidecade two-staged inductive voltage dividers (IVD) has been made and from this an optimized design for the frequency band 10-400 Hz has been evaluated. A three-decade divider rated at 0.6 times frequency has been constructed and calibrated and the errors of voltage division do not exceed the design limits of 5 × 10-9 of input. View full abstract»

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  • Absolute Measurement of Voltage by an Electrostatic Energy-Changing Method

    Publication Year: 1972, Page(s):372 - 375
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1496 KB)

    A new method for an absolute measurement of voltage is given. It is based on the phenomenon that, when one electrode of a capacitor supplied with a constant voltage is moved, the amount of the change of the electrostatic energy stored in the capacitor is equal to the work required for this movement. A prototype of an apparatus to be used in this method was prepared and its performance has been exa... View full abstract»

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  • A Noncontacting Magnetic Pickup Probe for Measuring the Pitch of a Precision Solenoid

    Publication Year: 1972, Page(s):376 - 379
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1795 KB)

    The magnetic-field gradients produced by a current sequentially activating a few turns of wire of a precision solenoid are used to measure its pitch. The position of the activated portion of wire can be resolved to 0.1 μm. Preliminary results are found to be in agreement with an earlier measurement using a contacting probe to within the uncertainty of the latter determination. This new tec... View full abstract»

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  • Automatic Measuring System for a Control of Standard Cells

    Publication Year: 1972, Page(s):379 - 384
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2925 KB)

    The automatic measuring system developed in the Electrotechnical Laboratory to monitor standard cells requiring a lot of measurements is described. It is composed of a scanner, an integrating-type digital voltmeter, a programmer or minicomputer, etc., and carries out the data acquisition and processing for a maximum of 200 cells. The difference in EMF of two cells is measured precisely. To reduce ... View full abstract»

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  • Introduction to Saturated Optical Absorption

    Publication Year: 1972, Page(s):384 - 387
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (843 KB)

    Saturated absorption techniques are being used increasingly often to measure optical resonances having such narrow bandwidths that they would otherwise be obscured by Doppler broadening. The principle underlying these techniques is reviewed using four simple thought or "gedanken" experiments. A rudimentary explanation is based on Bennett's " hole-burning" picture. Two configurations of typical sat... 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.

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