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About 10,000 papers for “System testing”

System Testing

2006

Abstract: Noise is present in every system. Phase noise, in particular, is commonly found in oscillators and phaselocked loops can degrade the performance of a system. Phase noise in the oscillator of a wireless communication system degrades the receiver's sensitivity in reciprocal mixing conditions. Phase noise in a telecommunications system causes time jitter in the signal chain. Although engineers usually try to minimize phase noise, sometimes for test purposes they degrade the phase noise intentionally. The deliberate introduction of phase noise aids in testing a system's tolerance for phase noise or jitter. Consequently, signals with an adjustable level of phase noise are useful for testing purposes.

Cited by 0

System Testing

Paul C. Jorgensen · Auerbach Publications eBooks · 2018

Cited by 0

System Testing

John B. Watkins, Simon Mills · Cambridge University Press eBooks · 2010

“The process of system testing is like removing the needles from the haystack without disturbing the straws”

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Testing System Reliability with Exponential Distribution Testing System Reliability

Wei Yan Mu, Jian Jie Chen, Li Ping Zhang · Applied Mechanics and Materials · 2015

In this article, we study inferences for reliability functions of the system having two components connected parallel. Suppose that the lifetime of two components have exponential distribution. Using the generalized inference approach, we obtain confidence intervals of our interested parameters with good coverage.

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Feedback system testing

Chantel E. White · IRE Transactions on Automatic Control · 1958

An analog method of servo system performance testing applicable to experimental analysis and system development and to go-no-go production and maintenance tesfiug has been devised. For a servo system with a forward transfer function G <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">eo</inf> and a feedback transfer function G <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ou</inf> the loop actuating signal equals the loop input signal divided by <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1+G_{eo}G_{ou}</tex> . The loop actuating signal becomes exactly equal to a test signal if the test signal is multiplied by the factor <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1+G_{eo}G_{ou}</tex> before application to the servo system. The difference between the loop actuating signal of the closed-loop servo system and the arbitrary test signal is continuously zero for the system exactly meeting the specification <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">G_{eo}G_{ou}</tex> function simulated in the signal generator. Sinusoidal testing methods are most effective with the servo system loop open. Transient testing (single-event time-domain input) is usually performed on servo systems with the loop closed. The analog method described, as distinguished from transient and sinusoidal methods, uses time-domain signals (a step-function signal generator input is found suitable) to obtain frequency-domain parameters in a method effectively making an open-loop test of a closed-loop servo system. The <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1+G_{eo}G_{ou}</tex> signal generator is conveniently realized using an analog computer of the operational amplifier type. An alternative mechanization of the signal generator uses only passive elements. Nonlinear as well as linear servo systems may be tested by the method. Single-integrator, angle tracking, and range-tracking servo systems have been analyzed. The range-tracking transfer function was employed in an analog computer experiment. Recordings of both the loop actuating signal and the difference between the loop actuating signal and the signal generator input were made for 0, ± 6 db, and ± 12 db departures from correct gain and for 0, ± 1, and ± 2 octave departures from correct corner frequency. A study of these recordings revealed potentialities for control of adaptive servo systems.

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Testing CHP system.

Zining Liu · Figshare · 2022

A testing CHP system includes a 6-bus electric power network and an 8-node heat network. The heat network consists of eight nodes, seven pipelines, two CHP units, four heat loads, and a heat storage tank connected to node 1.

Cited by 0Open access

Testing CHP system.

Zining Liu · Figshare · 2022

A testing CHP system includes a 6-bus electric power network and an 8-node heat network. The heat network consists of eight nodes, seven pipelines, two CHP units, four heat loads, and a heat storage tank connected to node 1.

Cited by 0Open access

Electrification system testing

R. Catlow · 2011

This paper presents an overview of electrification system testing as applied to British infrastructure, but most aspects are equally valid for other systems and administrations. It covers why testing is required, basic methods of testing and processing and analysis of the acquired data.

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Testing the System

Debney, Patricia · Kent Academic Repository (University of Kent) · 2011

memoir column about living with type 1 diabetes in the family

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Fiber System Testing

John D. Chipman · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1985

Measurement methods used in normal installation or maintenance activities cn optical fiber communication systems are reviewed. Measurements discussed include fiber cable continuity, attenuation, bandwidth/dispersibn, optical time domain reflectometry, power penalty, bit error rate, optical margin, and eye degradation. Test methods described are based upon current Electronic Industries Association (EIA) draft standards. Advantages and disadvantages of various testing techniques used within laboratory and field environments are addressed. Indepth details and special considerations are presented on the topics of fiber cable attenuation, bandwidth, and optical time domain reflectometry for singlemode and multimode fielded systems. Problems with field environments are highlighted and field tests are related to EIA standard factory tests.

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