IEEE Transactions on Instrumentation and Measurement

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Displaying Results 1 - 25 of 36

Publication Year: 1987, Page(s): 1
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• [Inside front cover]

Publication Year: 1987, Page(s): c2
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• Utilize software rather than fight it

Publication Year: 1987, Page(s): 1
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• Experimental results on a 9.2-GHz superconducting cavity stabilized oscillator

Publication Year: 1987, Page(s):2 - 8
Cited by:  Papers (3)
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Experimental results of the frequency stabilization of a Gunn diode oscillator by a 9.2-GHz TM010 niobium superconducting cavity (unloaded Q=4×108) are described. The cavity is used as the frequency-determining element in a frequency discriminator circuit. The technique of frequency stabilization is reviewed. The frequency shift of the superconducting cavity sta... View full abstract»

• Generalized injected voltage method for the establishment of multidecade inductive voltage divider standard

Publication Year: 1987, Page(s):9 - 12
Cited by:  Papers (2)
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A generalized injected voltage (GIV) method for a multidecade inductive voltage divider (IVD) is described. This method can be used for calibration multidecade IVDs including not only each individual decade's settings but also combinations of decade settings in succession. The uncertainty of this method is estimated to be within 2×10-8 at 1 kHz and 2×10-7 at 10 ... View full abstract»

• Wide-range electronically tunable multifunctional OTA-C filter for instrumentation applications

Publication Year: 1987, Page(s):13 - 17
Cited by:  Papers (7)
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A simple scheme is presented for realizing four standard second-order transfer functions, i.e. low-pass, high-pass, bandpass, and band-elimination. The system is implemented using only operational transconductance amplifiers (OTAs) and capacitors. The resulting circuit has the attractive feature of wide-range electronic tuning of pole frequency, bandwidth, and pole Q. These parameters may a... View full abstract»

• Minimization of reactive power under nonsinusoidal conditions

Publication Year: 1987, Page(s):18 - 22
Cited by:  Papers (28)
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The author extends his earlier paper Considerations on reactive power in nonsinusoidal situations' (see ibid., vol.IM-34, no.3, p.399-404, 1985) to compensation issues. IT is shown that the shunt LC compensator can minimize the reactive power of an RL load only if one of its parameters, L or C is fixed. A method of capacitance calculation is presented and it is shown t... View full abstract»

• Techniques for measuring the effective source reflection coefficient of two-resistor power splitters

Publication Year: 1987, Page(s):23 - 28
Cited by:  Papers (5)
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Three techniques for measuring the effective source reflection coefficient of a two-resistor power splitter are discussed. Computing the coefficient from measured S parameters is sensitive to small measurement errors. Descriptions are given of two direct measurement methods that avoid such sensitivities. The more convenient one uses a passive open circuit on the input port of the splitter d... View full abstract»

• Error minimization in time-constant measurements

Publication Year: 1987, Page(s):29 - 31
Cited by:  Papers (3)
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Time-constant measurements are often applied to determine parameters of exponential waves, and to find the value of capacitance or resistance in an RC circuit. The charging or discharging process is then monitored and the time distance, defined by two threshold levels, is precisely measured by means of a digital method. Analysis shows that proper choice of the thresholds can reduce a measur... View full abstract»

• Accurate spectral estimation from unequally spaced samples of exponentially damped sinusoidal signals

Publication Year: 1987, Page(s):32 - 36
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A method is presented to interpolate and extrapolate unequally spaced signals that are not bandlimited. This is achieved by utilizing the Gregory-Newton quadrature formula which circumvents aliasing without bandlimiting. With the Gregory-Newton quadrature formula, it is possible to compute the Fourier spectrum of the unequally spaced signals, which is not bandlimited. The effect of noise on the Gr... View full abstract»

• The recording and processing of pulsed laser diode spectra

Publication Year: 1987, Page(s):37 - 43
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A system capable of measuring and statistically analyzing wavelength and intensity fluctuations in pulsed-laser-diode output beams has been developed. The snapshot wavelength-intensity performance of laser diodes emitting discrete short-duration optical pulse is determined by isolating and recording individual pulses. Statistical processing of the resultant data generates information about the mag... View full abstract»

• An experimental investigation of transient torques

Publication Year: 1987, Page(s):44 - 46
Cited by:  Papers (3)
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A technique is described for measuring and recording the torque generated by a prime mover over the full range of its speed. The prime mover chosen for the investigation is an induction motor in order to demonstrate that the technique can be used even on a motor whose torque over a wide range of speed cannot be readily measured by conventional steady-state methods. A method of measuring the transi... View full abstract»

• Systematic errors in digital cross correlators due to quantization and differential nonlinearity

Publication Year: 1987, Page(s):47 - 53
Cited by:  Papers (3)
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The errors in digital cross correlators caused by quantization and differential nonlinearity are discussed. It is shown that if there is sufficient uncorrelated noise, the effects of quantization are negligible. Analytic expressions for errors caused by differential nonlinearity in a cross correlator measuring Gaussian noise are derived. A procedure for calibrating digital cross correlators is out... View full abstract»

• Digital sampling laboratory wattmeter

Publication Year: 1987, Page(s):54 - 59
Cited by:  Papers (21)  |  Patents (1)
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A versatile laboratory multifunction wattmeter based on digital sampling has been developed for incorporation into a laboratory calibration system. The meter uses two 15-bit analog-to-digital converters and achieves an overall power measurement accuracy of 0.015% of applied volt-amperes at power line frequencies over the range of 100 mA to 100 A and 5-100 V. Although intended for system use throug... View full abstract»

• A 4-GHz band low-noise measurement system

Publication Year: 1987, Page(s):60 - 66
Cited by:  Papers (5)
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A 4-GHz-band noise measurement system has been built for calibrating microwave low-noise sources accurately. The system reduces the contribution of several errors occurring in conventional systems. The system is composed of a highly stable and sensitive Dicke-type comparison radiometer, whose front end is cooled with liquid nitrogen, and two highly stable standard noise sources: one using liquid n... View full abstract»

• Uncertainties in radiofrequency dielectric measurements of biological substances

Publication Year: 1987, Page(s):67 - 70
Cited by:  Papers (3)
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Capacitive sample holders and an automatic network analyzer are used to measure dielectric properties of biological tissues in vivo and in vitro at a controlled temperature in the frequency range of 10 kHz-100 MHz. An analysis of uncertainty is performed leading to the optimization of the sensor and the measurement system. Under optimized conditions, one sample holder can be used over the entire f... View full abstract»

• Instrumentation for high-speed image connectivity

Publication Year: 1987, Page(s):71 - 76
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For flexible manufacturing, sorting, parts handling, etc., there are but a few object identification and tracking techniques that can approach or attain the speed requirements for real-time measurements on sequential images. One of the subtasks involved in the object identification process is the grouping of previously classified pixels into objects that can then be identified and located. Signifi... View full abstract»

• Application of MOSFET's in the temperature compensation of DC amplifiers

Publication Year: 1987, Page(s):77 - 82
Cited by:  Papers (5)
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A new application of metal oxide silicon field-effect transistor (MOSFET) devices is presented for solving the problem of drift in the characteristics of DC amplifiers under the effect of temperature variations in the range of 20-75°C. Expressions for the bias voltages and drain currents for operation at zero temperature coefficient for linear and nonlinear devices were derived. The validit... View full abstract»

• Displacement measurement by SAW delay-line oscillator consisting of two LiNbO3 plates with IDT

Publication Year: 1987, Page(s):83 - 86
Cited by:  Papers (2)  |  Patents (1)
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A displacement sensor can be made by constructing a surface acoustic wave (SAW) delay-line oscillator, in which two LiNbO3 plates with an interdigital transducer (IDT) on the surface of each plate are conjoined by attaching a part of the propagation surface of one plate to a part of the propagation surface of the other. In the SAW sensor, the oscillation frequency depends on propagation... View full abstract»

• A microcomputer-based programmable temperature controller

Publication Year: 1987, Page(s):87 - 91
Cited by:  Papers (1)
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The authors have designed an automatic electronic temperature controller using an analog-to-digital converter, a digital-to-analog converter and a power device controlled by the phase of the power supply current. An Apple II microcomputer controls the heating or cooling in response to the digitized data, and can be set to control a wide range of nonlinear and repetitive processes. Need for continu... View full abstract»

• A programmable function generator for dynamic analysis testing

Publication Year: 1987, Page(s):92 - 95
Cited by:  Papers (1)
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A flexible function generator with high-resolution programmability of frequency, amplitude, and DC offset has been developed for structural dynamics testing. The generator consists of a clock generator which defines the signal frequency and memory tables which define the signal functions. In order to obtain a fast-settling, stable, accurate variable clock signal, a frequency-locked-loop circuit wa... View full abstract»

• A microcomputer-controlled multichannel programmable pattern generator

Publication Year: 1987, Page(s):96 - 99
Cited by:  Papers (2)
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The design of a single-board, microcomputer-controlled, digital pattern generator is discussed. The generator provides eight synchronous, TTL-compatible, NRZ channels. The controller is a 6502-based Rockwell AIM 65 microcomputer. The generator master clock frequency is 10 MHz, but a single vector can be delayed from 100 ns to 99000 s. Programmable delays avoid wasting memory in applications requir... View full abstract»

• Microcomputer-aided measurement equipment for performance monitoring of a digital radio-relay system in the presence of multipath propagation

Publication Year: 1987, Page(s):100 - 103
Cited by:  Papers (2)
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A microcomputer-controlled radio-communication controller (μCC) was designed and constructed to analyze and measure a true' error rate in a high-capacity digital radio link and to record fast-level variations of received radio frequency power (IF amplifier-AGC voltage) for a better characterization of propagation anomalies. The μCC represents a high-performance measuring device for ... View full abstract»

• An accurate method for the measurement of line frequency and its deviation using a microprocessor

Publication Year: 1987, Page(s):104 - 109
Cited by:  Papers (7)
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A digital method for the accurate measurement and display of line frequency and its deviation from its nominal value is described. The method is based on counting a number of high-frequency pulses proportional to the line period, and then calculating the line frequency and its deviation in a microprocessor system that also provides the monitoring functions. The method provides a resolution of one ... View full abstract»

Publication Year: 1987, Page(s):110 - 114
Cited by:  Papers (4)
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An instrumentation radar that uses a chirp waveform to achieve high-range resolution is described. High-range-resolution instrumentation radars evaluate the target response to operational waveforms used in high-performance radars and/or obtain display of the individual target scattering mechanisms to letter understand the scattering process. This particular radar was efficiently constructed from a... View full abstract»

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

Editor-in-Chief