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7th IEEE Conference on Instrumentation and Measurement Technology

13-15 Feb. 1990

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Displaying Results 1 - 25 of 81
  • How good is your calibration? A post-mortem examination and recalibration

    Publication Year: 1990
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (24 KB)

    Summary form only given. It is pointed out that the standard network analyzer calibration procedure suffers from several drawbacks. The test patterns, for instance, often reside on a wafer different from that being tested. The normal procedure is to measure only a single set of calibration patterns instead of collecting a statistically significant sample spanning the wafer. Wafer thickness uniform... View full abstract»

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  • Conference Record. IEEE Instrumentation and Measurement Technology Conference (Cat. No.90CH2735-9)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (81 KB)
    Freely Available from IEEE
  • Standard testability bus-an applications example

    Publication Year: 1990
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (72 KB)

    An application of a standard testability bus to the design of a next-generation automatic test system is described. The target system that must be made testable consists of multiple printed circuit boards that can be functionally reconfigured at start-up time via downloading of specific operating parameters to the on-board RAM. The result of the application was the ability to meet the system-level... View full abstract»

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  • A standardized instrument programming language based on IEEE Std 488.2

    Publication Year: 1990, Page(s):306 - 310
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The author describes the features of TMSL (Test and Measurement System Language) and how they relate to compatibility. TMSL implements a tree-structured command set, rather than a traditional flat instrument language, allowing keywords to be reusable and identifiable in context. Reusable keywords also allow for simple and regular mnemonic generation rules. TMSL also addresses parameters through th... View full abstract»

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  • On the in situ probe method for measuring the permittivity of materials at microwave frequencies

    Publication Year: 1990, Page(s):28 - 31
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    A technique to be used for determining in-vivo dielectric properties of materials at microwave frequencies is examined. The technique involves the use of an open-ended coaxial line as a sensor and models the coaxial aperture on the basis of a quasi-static analysis. This theory is discussed along with a correction method to account for system imperfections. With the proper choice of calibration sta... View full abstract»

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  • An electronic high-pressure measuring system using a polarimetric fiber-optic sensor

    Publication Year: 1990, Page(s):63 - 65
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    An electronic, microcontroller-based system for high-pressure measurement, using a novel fiber-optic sensor, is presented. Attention is given to the problem of how to deal with a nonmonotonic (sinelike) characteristic of the sensor as a function of input pressure. The concept of a multisensor system is discussed, and a three-sensor, microcontroller-based, `on-a-card' version of the system is propo... View full abstract»

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  • Experience with the IEEE pulse standards at Wavetek

    Publication Year: 1990, Page(s):303 - 304
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    IEEE Std 194 is a standard for pulse terms and definitions, and IEEE Std 181 is a standard for pulse measurement and analysis. The author presents his observations about the experience with and importance of the IEEE pulse standards at Wavetek. He considers why the standards are not being widely used View full abstract»

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  • A ratio transformer bridge for the measurement of low-loss tangents

    Publication Year: 1990, Page(s):20 - 26
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The authors discuss the architecture of transformer ratio bridges for measuring the loss angles of low-loss dielectrics and describe the development of a sensitive and accurate bridge, capable of measuring loss angles with a sensitivity of 1×10-8 (S/ N=1 at a detector bandwidth of 1 Hz) and an accuracy of a few parts in 10-7. The bridge is computer con... View full abstract»

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  • A microstep controller of a DC servomotor

    Publication Year: 1990, Page(s):60 - 62
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    A microstep controller of a DC servomotor has been developed for accurate positioning and smooth movement at low-speed rotation. It consists of digital and analog positioning loops. Dividing one period of quadrature sinusoidal signals, generated by an incremental encoder attached to a motor shaft, into four quarter sections, the digital loop controls the movement between the sections. The analog l... View full abstract»

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  • Limitations of the IEEE pulse standards and suggested improvements

    Publication Year: 1990
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    IEEE Std 194 assumes that the polarity of a pulse being measured is known to the user who wishes to extract its parameters. It is pointed out that this is often not the case when the only information about the signal in question is contained in a waveform record. The author proposes an unambiguous depiction of the record as a train of transitions allowing the extraction of `pulselike' parameters. ... View full abstract»

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  • An accurate RMS/DC voltage comparator

    Publication Year: 1990
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    The authors describe a new instrument which is designed to operate as a null meter with a range of ±1000 p.p.m. of typical test voltages used in high-accuracy AC calibrations. It is based on a commercially available dual-heater-type converter in a standard integrated circuit package. The accuracy of the instrument is better than 100 p.p.m. for frequencies of 50 Hz to 200 kHz. It can, howeve... View full abstract»

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  • Design for testability using behavioral models

    Publication Year: 1990, Page(s):75 - 78
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors present a systematic approach to analog design-for-testability which uses behavioral models for fault simulation so that objective comparisons can be made between alternative test configurations. This technique of design-for-testability is shown to be especially well suited to an ASIC's (application-specific integrated circuits') environment because the models can be reused and combine... View full abstract»

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  • A simple method for the evaluation of microwave mixer diodes

    Publication Year: 1990, Page(s):104 - 106
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The authors describe a novel method for the evaluation of the various microwave (MW) mixer diodes which can be used in electron paramagnetic resonance (EPR) spectrometers. The advantage of this method over other methods is that it is optimized for EPR applications and determines the optimum operating conditions for each MW diode. The authors describe the instrumentation and the experimental proced... View full abstract»

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  • Non-contact capacitive torque sensing on a rotating conductive axis

    Publication Year: 1990, Page(s):136 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A capacitive torque sensor in which two angular displacement sensors are spaced a well-defined distance apart is proposed. The rotor of each of these capacitive displacement sensors is composed of an array of electrodes connected to sine waves with phase angles in the sequence -0°-90°-180°-270°. These voltages are capacitively coupled from the stator to the rotor. The stator is als... View full abstract»

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  • Multiaxis compliant capacitive wrist sensor for use in automated assembly with industrial robots

    Publication Year: 1990, Page(s):54 - 59
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A compliant capacitive wrist sensor can be used as a versatile aid to a vision system in assembly using industrial robots. A sensor which is designed to measure the bending moments in the x and y directions, the force in the z direction, and the torsion moment around the z direction is described. The sensor consists of two opposite electrode patterns with an el... View full abstract»

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  • Software calibration: a view on a linear deviation concept

    Publication Year: 1990, Page(s):89 - 93
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The development of a specialized circuit for measurement and recording (essentially a microcontroller with a masked ROM containing a specialized program) is described. The software calibration method is based on the assumption of a linear deviation from the nominal law. The purpose of this approach is to offer for loggers an architecture as universal as possible and also to simplify the task of th... View full abstract»

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  • A review of IEEE pulse standards 194 and 181

    Publication Year: 1990, Page(s):296 - 301
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The author presents a brief history of the development of the IEEE pulse standards and outlines their organization and content with emphasis on old terms with new names and new terms. It is noted that these standards (and their International Electrotechnical Commission counterparts) are applicable to a wide range of pulse measurement situations ranging from automatic instruments that digitize, sto... View full abstract»

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  • Introduction to waveform recorder testing

    Publication Year: 1990, Page(s):201 - 206
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    It is shown that a wealth of information can be gathered on a waveform recorder by conducting two general tests: the sine-fit test and the step response test. The sine-fit test includes the effects of noise, nonlinearities, and aperture uncertainty but does not measure amplitude flatness or phase linearity. Sine-wave data may also be used to obtain a code-bin histogram, differential nonlinearity, ... View full abstract»

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  • The implementation of a digital sine-wave oscillator using the TMS320C25: distortion reduction and applications

    Publication Year: 1990, Page(s):14 - 18
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The implementation of a digital sine-wave oscillator using the TMS320C25 digital signal processor (DSP) is described. The system is implemented with the Dalanco Spry model 25 DSP board, and a software system is designed whereby an IBM PC host computer provides control of the waveform generator functions and parameters. Waveforms are generated using the look-up-table (LUT) method. The direct LUT me... View full abstract»

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  • Integrating sensors into a standard control architecture for robotic applications

    Publication Year: 1990, Page(s):120 - 125
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The problem of the integration of sensors into a coherent system for robotic applications is addressed by presenting a standard robot control architecture, the NASA/NBS Standard Reference Model for Telerobot Control System Architecture (NASREM). NASREM has three hierarchies: a task decomposition hierarchy, a world modeling hierarchy, and a sensory processing hierarchy. Goals at each level of the t... View full abstract»

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  • Second order discriminant function for amplitude comparison monopulse

    Publication Year: 1990, Page(s):173 - 176
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    A novel three-receiving-elements amplitude comparison monopulse direction finding (DF) technique is introduced. An appropriate second-order discriminant function is chosen for this technique. Then simulation is used to compare its accuracy with that of the two-receiving-elements DF technique. Different sources of error were taken into consideration, such as receiver noise, pattern errors, amplitud... View full abstract»

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  • Novel approaches to optical reflectometry

    Publication Year: 1990, Page(s):329 - 333
    Cited by:  Papers (2)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The author reviews the fundamentals of optical reflectometry, including the standard optical time-domain reflectometry (OTDR) measurement. Some novel reflectometry schemes are described, including a spread-spectrum approach to long-range OTDR, as well as new optical frequency-domain reflectometry (OFDR) techniques that have proven useful for high-resolution measurements. These novel reflectometry ... View full abstract»

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  • On the use of signals with a constant signal-to-noise ratio in the frequency-domain

    Publication Year: 1990, Page(s):360 - 366
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    It is pointed out that most estimation methods, when applied to linear time-invariant systems, do not take into account the noise on the input signal. It is well known that these methods generate biased estimates when input noise is present. It is demonstrated that unbiased pole-zero estimates of the device under test (DUT) can still be obtained when an input signal with a constant signal-to-noise... View full abstract»

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  • Measurement of the dielectric properties of materials by using time domain reflectometry

    Publication Year: 1990, Page(s):263 - 269
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    The authors present some TDR (time-domain-reflectometry) applications for complex permittivity measurements for strong polar liquid in the frequency range of 1 to 35 GHz, liquid crystal from 100 kHz to 1 GHz, and ionic microemulsion at frequencies between 30 MHz and 20 GHz. In each case, the necessary TDR techniques for optimal condition are given. The new TDR system (HP54120A+HP54121A) used has e... View full abstract»

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  • An algorithm for diagnostics with signature analyzer

    Publication Year: 1990, Page(s):69 - 74
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    An algorithm for fault diagnosis that makes use of the information from a faulty signature is presented. The idea is to search the likely error locations before the tests are performed. The method reduces the number of tests required to diagnose the errors with the probability of aliasing. Such probability is always smaller than that of error detection in signature analysis. When matching tests ar... View full abstract»

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