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Instrumentation and Measurement Technology Conference, 1992. IMTC '92., 9th IEEE

Date 12-14 May 1992

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Displaying Results 1 - 25 of 142
  • IMTC '92. IEEE Instrumentation and Measurement Technology Conference (Cat. No.92CH3151-8)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (31 KB)
    Freely Available from IEEE
  • Narrowband multifrequency binary measurement using phase shift keyed modulation

    Publication Year: 1992, Page(s):180 - 185
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Multifrequency binary testing (MBT) employs binary test signals to evaluate frequency response estimates. Multifrequency binary sequence (MBS) test signals allow the capture of a wide variety of frequency information with excellent signal-to-noise-power ratios for their dominant harmonics. Two identification channel coding theorems use compact binary codes and digital modulation as the basis of si... View full abstract»

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  • Practical considerations in the design of multisine test signals for system identification

    Publication Year: 1992, Page(s):174 - 179
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The design of nonbinary multifrequency excitation signals for system identification is examined. The performance of such signals in parametric time-domain estimation and nonparametric frequency-domain estimation for noisy and nonlinear systems is assessed, and a comparison with the maximum length binary sequence is made. A nonbinary multifrequency signal composed of prime harmonics is proposed for... View full abstract»

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  • Design of programmable FIR digital filter to optimize the detection of signals embedded in white noise

    Publication Year: 1992, Page(s):224A - 224F
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The order of a multiband FIR filter is reduced using a programmable passband filter for normalized frequencies. The parameters of a single-band passband filter are extracted from the parameters of a normalized lowpass digital FIR filter using a bilinear transformation. The stopbands of the low-pass digital filter are designed to limit the maximum response from a strong sinusoid, and also to minimi... View full abstract»

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  • An outsider's view of system identification

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    The author proposes an explanation of the term `system identification', using a system with an applied stimulus and observed response, and the concept of the model-based approach. A brief analysis is provided of the value of time-domain versus frequency domain techniques for purposes of system identification View full abstract»

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  • A learning algorithm for self-calibration of a voltage calibrator

    Publication Year: 1992
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    A proposal is made to either extend the calibration period or reduce the measurement uncertainty of a DC voltage reference module used as a transfer, independent or working standard or as a reference module incorporated within a larger measuring system. An algorithm for self-calibration of a precision voltage calibrator is discussed. The basic concept is that the history of deviations in measured ... View full abstract»

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  • A method of measuring finger pressure during keyboard data entry

    Publication Year: 1992, Page(s):57 - 58
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    Utilizing force sensing resistor technology, an initial system has been devised that measures applied finger pressure during keyboard data entry without impairing the normal accessibility of the keys. The system has been developed to support a more quantified study of the various ergonomic issues associated with occupations requiring considerable data entry by keyboard. The system is designed to o... View full abstract»

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  • Techniques for identification of harmonics in industrial power systems

    Publication Year: 1992, Page(s):114 - 119
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Two techniques for accurate harmonic analysis of industrial power systems are presented. The first is based on the fast Fourier transform (FFT) of the sampling sequences of voltage and current waveforms. It performs a decimation of the acquired data, adopting nonrecursive low-pass FIR filters, to achieve frequency zooming in the spectrum. Then, a flat-top windowing is executed to reduce the negati... View full abstract»

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  • Instrument control enhancements using Microsoft Windows 3.0

    Publication Year: 1992, Page(s):239 - 242
    Cited by:  Papers (1)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The various ways of controlling instrumentation over the IEEE-488 interface using a personal computer in a Microsoft Windows 3.x environment are described. Instrument and software manufacturers have employed the data transfer capabilities within Windows and have added software and drivers so that Windows applications can be used in an instrumentation environment. The dynamic data exchange (DDE) an... View full abstract»

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  • A new modulation-index measuring instrument for square-wave FM signal

    Publication Year: 1992, Page(s):52 - 55
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A method measuring the modulation indexes of square wave frequency modulation (SWFM) signals have been proposed and experimentally verified. The measurement circuit consists of a series of bandpass filters, DC rectifiers, analog-to-digital converters, and a processor for calculating the frequency deviation. In accordance with the modulation index of the SWFM signal at the fundamental and third-har... View full abstract»

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  • Weighted detector array for linear position sensing

    Publication Year: 1992, Page(s):409 - 413
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The weighted detector array method for the measurement of linear position is proposed. It is based on the principle of measuring incident optical power distribution on a detector array by a built-in parallel weighting and summing structure. The method can achieve significant position resolution. Dynamic range limitation is compensated by the use of adaptive control, so that for long travel a large... View full abstract»

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  • A study on colorimetric errors caused by quantizing chromaticity information

    Publication Year: 1992, Page(s):374 - 378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Quantization errors resulting from a linear analog-to-digital converter (ADC) are represented by a uniform sawtooth. When three-dimensional analog signals carrying chromaticity information are quantized, the quantization errors themselves do not reflect errors in psychometric color differences because of the nonlinear color sensitivity of human eyes. An attempt is made to convert the quantization ... View full abstract»

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  • A practical methodology for estimating uncertainty in electrical signal measurements

    Publication Year: 1992, Page(s):623 - 628
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A practical methodology for quantifying electrical signal measurement uncertainty is presented. This approach allows the user to estimate the uncertainty of test equipment based on comparative measurements with off-the-shelf reference meters. By making a series of steady-state measurements with the device under test (DUT) and the reference meter connected in parallel, data which represents both th... View full abstract»

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  • A fast variable transition time pulse generating circuit

    Publication Year: 1992, Page(s):152 - 157
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A pulse generating circuit has been developed which extends the flexibility of high-speed pulse generators by offering variable transition times from 300 ps up to 1 ns. This is in addition to being able to operate with pulse repetition rates from DC up to 500 MHz and with amplitudes up to 5 V into 50 Ω. A gallium arsenide (GaAs) pin driver IC forms the variable transition predrive pulses tha... View full abstract»

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  • Single-kernel moisture determination in grain and nuts by RF impedance measurements

    Publication Year: 1992, Page(s):422 - 424
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The moisture content of single corn and peanut kernels, single in-shell pecan nuts and pecan kernel halves was determined by measurement of the impedance of a small parallel-plate capacitor with the kernel or nut between and in contact with the plates at two frequencies between 1 and 5 MHz. Standard errors of performance ranged from 0.5 to 0.7 percent moisture, and the method appears useful for pr... View full abstract»

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  • Instrumentation curriculum: from ATE to VXI

    Publication Year: 1992, Page(s):265 - 267
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    It is argued that the instrumentation curriculum provides a number of opportunities for change through the use of modern ATE equipment in the electrical engineering laboratory. New interface buses like VXIbus provide opportunities for advanced digital interface design and implementation of custom instrumentation interfaces. The use of integrated software packages like LabWindows and LabView allows... View full abstract»

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  • A versatile and accurate 300 MHz time generation circuit

    Publication Year: 1992, Page(s):233 - 237
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A 300-MHz timing generator has been designed and implemented on a digital application-specific integrated circuit (ASIC) platform to act as the fundamental circuit block of a pulse generator. Within this circuit block, all pulse generator timing functions, such as period generation, delay generation, and width generation, have been provided. The circuit implements the various trigger and logic fun... View full abstract»

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  • Instantaneous phase tracking in power networks by demodulation

    Publication Year: 1992, Page(s):314 - 319
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A technique for instantaneous monitoring of phase angles during transients in power networks is presented. The proposed algorithm is based on demodulation and subsequent filtering of the measured signal, which allows very accurate tracking of transient phase angles (within 1 degree). The simplicity of this method and its performance make it an excellent candidate for real-time implementation. A nu... View full abstract»

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  • An instrument for concurrent program flow monitoring in microprocessor based systems

    Publication Year: 1992, Page(s):169 - 172
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The activity of a microprocessor system can be altered by random failures due to dynamic hardware faults or unforeseen software errors that cannot be detected by common automatic test (ATE) or built-in self-test (BIST) offline systems. The authors describe a method for the detection of a particular class of such faults. This method is based on a monitoring strategy that surveys online the correctn... View full abstract»

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  • A wide-range logarithmic electrometer with improved accuracy and temperature stability

    Publication Year: 1992, Page(s):454 - 459
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    A seven-decade temperature-compensated logarithmic electrometer is presented. Temperature compensation is achieved by using an array of four matched monolithic bipolar transistors and straightforward postprocessing techniques. Use of this method results in <1% error over the temperature range of -18 to 71°C for the upper five decades of current. Errors resulting from variable forward curren... View full abstract»

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  • Fabrication and characterization of a clover type position sensitive detector

    Publication Year: 1992, Page(s):404 - 408
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A new type of lateral-effect position-sensitive photodetector (PSD) has been fabricated on silicon using standard IC technology. The new geometry is called a clover PSD. The experimental performance of tetralateral, pin-cushion, and clover PSDs is compared in terms of measurement linearity and sensitivity. The distortion in linearity is more severe than the simulated values in every case, since th... View full abstract»

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  • Modeling, simulation, and measurement considerations of high-speed digital buses

    Publication Year: 1992, Page(s):147 - 151
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Some of the major limiting factors of high-speed buses are discussed. It is shown that on loaded backplanes, the propagation delay is a function of the device's trigger threshold. The stub-ringing phenomenon is also discussed. For single, capacitively loaded stubs, the ringing frequency is shown to be lower than what is expected from quasi-lumped models. A simple dual-stub butterfly model is intro... View full abstract»

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  • Signal analysis applied to vortex flowmeters

    Publication Year: 1992, Page(s):697 - 701
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Vortex flowmeters are applied to the measurement of fluid flows where instruments with no moving parts and with wide rangeability are required. Process conditions influence the operation of a vortex flowmeter and fluctuations in the flow affect the complex phenomenon of vortex street formation. In the present study the signal taken directly from the sensor employed in an industrial vortex flowmete... View full abstract»

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  • Review of downhole production logging instrumentation

    Publication Year: 1992, Page(s):201 - 207
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    State-of-the-art production logging instrumentation used to delineate downhole flow rate and fluid composition for two and three phase oil/water/gas wells is described. Various sensors are described, and the advantages and limitations of different tools are enumerated. The use of radioactive tracer flowmeters in injection and production wells is discussed. Classical techniques for interpretation o... View full abstract»

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  • Mean value measurements using quantized data

    Publication Year: 1992, Page(s):369 - 373
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The effect of imperfect fulfilment of the validity conditions of the noise model of quantization is investigated. General expressions for the deviations from the Sheppard corrections are derived, and approximate upper bounds are given for the case of the measurement of first- and second-order moments of sinusoidal, uniformly distributed, and Gaussian signals. It is shown that the deviations should... View full abstract»

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