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IEEE Transactions on Instrumentation and Measurement

Issue 4 • Nov. 1970

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Displaying Results 1 - 25 of 48
  • [Front cover]

    Publication Year: 1970, Page(s): c1
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    Freely Available from IEEE
  • IEEE Instrumentation and Measurement Group

    Publication Year: 1970, Page(s): c2
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  • Table of contents

    Publication Year: 1970, Page(s): 195
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  • Foreword

    Publication Year: 1970, Page(s):196 - 197
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  • Scanning the issue

    Publication Year: 1970, Page(s):198 - 199
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  • Measurement of the Unperturbed Hydrogen Hyperfine Transition Frequency

    Publication Year: 1970, Page(s):200 - 209
    Cited by:  Papers (93)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2366 KB)

    The results of a joint experiment aimed primarily at the determination of the frequency of the H1 hyperfine transition (F = 1, mF = 0) ↔ (F = 0, mF = 0) is reported. In terms of the frequency of the Cs133 hyperfine transition (F = 4, mF = 0) ↔(F = 3, mF = 0), defined as 9192 631 770 Hz, for the unperturbed hydrogen transition frequency the value υH = 1420 405 751.768 Hz is ... View full abstract»

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  • Analysis of Modulation Method for Measuring Atomic Resonant Frequency

    Publication Year: 1970, Page(s):209 - 215
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1324 KB)

    In microwave spectroscopy and in atomic frequency standards, the atomic resonant frequency is often determied by the use of harmonic frequency modulation of a microwave signal. The effects of line asymmetry and modulating-signal nonlinear distortions are investigated by the use of an analytic approximation of the resonance line by means of an algebraic polynomial. The coefficients of the polynomia... View full abstract»

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  • A Test Set for the Accurate Measurement of Phase Noise on High-Quality Signal Sources

    Publication Year: 1970, Page(s):215 - 227
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3853 KB)

    The test set described here is capable of measuring the spectral density of phase noise on carrier frequencies from 1 to 500 MHz, for offset frequencies from 20 Hz to 50 kHz. Measurements to 50 MHz are described. The test set has a residual single-sideband phase-noise-power-to-signal-power ratio of -142 dB/Hz at 20 Hz offset from the carrier, which decreases to a floor of -172 dB/Hz at offset freq... View full abstract»

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  • Comparison of National Time Standards by Simple Overflight

    Publication Year: 1970, Page(s):227 - 232
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1142 KB)

    The Office National d'Études et de Recherches Aérospatiales has devised a method of time synchronization by what is described as "simple overflight," relying on a high-precision airborne timepiece, without the need to go close to the clocks under comparison. The method has repeatedly been tested, and the results show the accuracy of synchronization to be better than 50 ns. A comparative experime... View full abstract»

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  • Time Synchronization by Television

    Publication Year: 1970, Page(s):233 - 238
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4451 KB)

    A simple technique for clock synchronization uses signals included in normal television transmissions as time markers. By use of automatic equipment built in the laboratory, it has been possible to make regular comparisons of time scales. Remote time laboratories can also be intercompared by this process. Accuracy of a fraction of a microsecond can be obtained easily. Numerical results of differen... View full abstract»

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  • Automated Characterization of Bolometric and Electrothermic Mounts

    Publication Year: 1970, Page(s):239 - 245
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4404 KB)

    The greatest inaccuracy in making a microwave power measurement is usually the uncertainty of the calibration factor or the effective efficiency. These terms account for the RF losses and substitution errors in the bolometric or electrothermic mount. A new method for transferring calibration from a standard mount to a mount to be calibrated has production line speed and simplicity; yet its accurac... View full abstract»

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  • Automatic Self-Certification of a Computer-Controlled Calibration System

    Publication Year: 1970, Page(s):245 - 252
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2482 KB)

    The theory, techniques, and apparatus that are used to perform an automatic self-certification of a computer-controlled calibration system are described. This process determines the linearity and bias deviations of the instrumentation of the system. These deviations are stored in the digital computer for subsequent use as corrections to the nominal instrument values when the system is applied to e... View full abstract»

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  • Automated Precision Polarimeter for the HF-VHF Range

    Publication Year: 1970, Page(s):252 - 259
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2300 KB)

    An automated system for Stokes parameter-polarization analysis over the HF-VHF range is described. Axial ratio, orientation angle, polarization fraction, and polarization sense are determined by amplitude measurements using a conventional fieldintensity receiver. Six amplitude measurements from four crossed nonresonant dipoles, including quadrature sum and difference, eliminate the requirement for... View full abstract»

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  • Redundant Measurements in Microwave Research and Development

    Publication Year: 1970, Page(s):260 - 262
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (571 KB)

    Capability and accuracy of microwave measuring methods and instruments can be substantially improved by the use of general-purpose digital computers. One of the fruitful applications is concerned with redundant measurements and their evaluation. In a redundant measurement more data are measured than would be necessary for a singular evaluation and the excess information is used to reduce measureme... View full abstract»

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  • Truly Transportable Standard-Cell Air Bath

    Publication Year: 1970, Page(s):263 - 266
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3302 KB)

    Dissemination of the volt is complicated by the complex temperature response of standard cells. Discribed are the design and performance characteristics of an experimental standard-cell airbath specifically optimized for transportable voltage-dissemination service. Salient features of this bath are 1) ±0.001°C control of the cell temperature in the laboratory, ±0.02°C maximum v... View full abstract»

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  • Resistive Voltage-Ratio Standard and Measuring Circuit

    Publication Year: 1970, Page(s):266 - 277
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4137 KB)

    This paper describes a highly stable, guarded dc voltage-ratio standard and the measuring network and techniques used to establish the values of its ratios to an accuracy of 0.2 ppm. The entire system is housed within a dry-air enclosure whose temperature is maintained at 23 ± 0.05°C. Discrete ratios from 1:1 to 1000:1 are provided, with maximum rated voltage set at 1000 volts. The design of the... View full abstract»

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  • 10-kY 10-mA DC Supply with 0.1-ppm Stability

    Publication Year: 1970, Page(s):278 - 281
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2629 KB)

    A 10-kV stabilized supply with a dc capacity of 10 mA has been constructed. Its drift rate measured over time intervals greater than about 1 minute and extending to times of more than 10 hours is about 1 part in 107 per hour. For shorter times from 1 second to 1 minute the peak-to-peak deviation from the mean is about 2 mV at 9.2 kV or ±1 part in 107. This performance has been achieved by the use... View full abstract»

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  • Dual Highly Stable 150-kV Divider

    Publication Year: 1970, Page(s):281 - 285
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2588 KB)

    A highly stable (± 1-ppm) 500-kV power supply is being developed for use in a high-resolution (~1-Å) electron microscope. One of the critical components in such a power supply is, of course, the feedback element, which, in this case, is a resistive voltage divider. A dual 150-kV divider has been constructed to determine the stability of such devices. The dividers are compared in a guarde... View full abstract»

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  • Pulsewidth Modulation DC Potentiometer

    Publication Year: 1970, Page(s):286 - 290
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1803 KB)

    This instrument uses pulsewidth modulation techniques in which a crystal oscillator, frequency divider, and preset counter replace the resistive divider to form a precision potentiometer. The smoothing of the time-division intervals to a steady-state direct current without introducing prohibitive time constants is solved by a "sectional average" integrating circuit. This utilizes a short time-cons... View full abstract»

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  • Direct-Current Comparator Bridge for Resistance Thermometry

    Publication Year: 1970, Page(s):291 - 297
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3352 KB)

    The design, construction, and performance of a dc bridge that covers the complete range of both platinum-and germanium-resistance thermometry in four ranges, 0-11 up to 0-11 000 ohms, is described. The bridge uses a potentiometric method based on the current comparator. In the design, emphasis has been placed on reducing the noise level, on obtaining a single-balance operation, and on providing a ... View full abstract»

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  • Improved Horizontal Cross Capacitor

    Publication Year: 1970, Page(s):297 - 302
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3342 KB)

    A new horizontal cross capacitor was constructed to achieve higher accuracy in the determination of absolute capacitance values. To eliminate some major causes of the uncertainty that had been found in the earlier capacitor, the bars were finished more precisely and new mechanisms were adopted. These are a fine adjusting mechanism for alignment of the bars and a supporting mechanism of the bars th... View full abstract»

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  • New Fused-Silica-Dielectric 10-and 100-pF Capacitors and a System for Their Measurement

    Publication Year: 1970, Page(s):302 - 307
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3057 KB)

    New instruments have been designed to bring to standards laboratories the improved accuracy of capacitor calibrations developed by the National Bureau of Standards. The new 10-and 100-pF reference standard capacitors, based upon an NBS design, use a fused-silica dielectric with gold electrodes to provide the time and voltage stability required for calibrations to parts in 107. To maintain the capa... View full abstract»

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  • Four-Terminal Equal-Power Transformer-Ratio-Arm Bridge

    Publication Year: 1970, Page(s):308 - 311
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (842 KB)

    A transfonner-ratio-arm bridge is described that combines the high sensitivity of equal-power bridges with the immunity from lead errors of ac bridges analogous to the Kelvin double bridge. The latter apply either equal current or voltage to both impedances being compared and suffer a reduction in sensitivity when the impedance ratio is high, while the sensitivity of bridges that apply equal power... View full abstract»

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  • Isolated-Section Inductive Divider and Its Self-Calibration

    Publication Year: 1970, Page(s):312 - 317
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2016 KB)

    A high-precision isolated-section inductive divider, designed for self-calibration, has been developed. In this new design principle, the two major sources of ratio error, excitation current and current through stray capacitance between sections of divider windings, have been greatly reduced by the use of a separate excitation winding and a guard for the divider winding. In a self-calibration divi... View full abstract»

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  • New Coaxial RF-DC Ammeter

    Publication Year: 1970, Page(s):318 - 323
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3099 KB)

    A unique new type of RF ammeter is described. The ammeter combines broad frequency coverage with broad current range and is designed for use in a 50-ohm coaxial transmission line. The ammeter consists of an elliptic-cylinder silver reflector of infrared energy with a cylindrical thick-film heater along one focus and a heat-sensing thermopile along the other focus. Advantages over older ammeter des... 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