Radio and Electronic Engineer
Volume 40, Issue 6, December 1970
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Volume 40, Issue 6
December 1970
Improving communication
- Source: Radio and Electronic Engineer, Volume 40, Issue 6, p. 273 –274
- DOI: 10.1049/ree.1970.0095
- Type: Article
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p.
273
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(2)
Predicting servomechanism dynamic performance variation from limited production test data
- Author(s): P.A. Payne ; D.R. Towill ; K.J. Baker
- Source: Radio and Electronic Engineer, Volume 40, Issue 6, p. 275 –288
- DOI: 10.1049/ree.1970.0096
- Type: Article
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p.
275
–288
(14)
A probabilistic model describing the considerable variation in dynamic performance of a large family of electro-hydraulic servomechanisms is presented. Two fundamentally different techniques are employed to obtain the parameters of the model, both techniques giving very similar results. A third-order dominant transfer function (derived from the production test data) together with high frequency complex poles and a high frequency lag (both factors derived from field testing) form a sixth-order system. Variable parameters for the sixth-order system form the probabilistic model and are presented as a table for use in Monte Carlo simulation. The model is then used to derive experimentally verified production test limits in a new test domain, equivalent to the original frequency domain gates, showing how the use of a novel filtering technique, recently described elsewhere, may be employed to simplify the setting of test limits. The model is also shown to be of use in the prediction of dynamic errors in many domains (whilst only requiring data in one domain) and the initial production test data are shown to predict accurately the dynamic error variation for the complete family.
The use of cathode-ray tubes in professional equipment
- Author(s): A.B. McFarlane
- Source: Radio and Electronic Engineer, Volume 40, Issue 6, p. 289 –299
- DOI: 10.1049/ree.1970.0097
- Type: Article
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p.
289
–299
(11)
Multiple stable state merging a practical approach to the design of asynchronous sequence detectors and similar circuits
- Author(s): D.T. Markey
- Source: Radio and Electronic Engineer, Volume 40, Issue 6, p. 300 –304
- DOI: 10.1049/ree.1970.0098
- Type: Article
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p.
300
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A practical method for reducing and merging the primitive flow table (or state table) of sequential machines is detailed. The method is particularly suited to more complex problems that are to be solved manually. By reducing the size of the primitive flow table at a very early stage in the design, the problems of reduction and merging are considerably simplified for certain types of machine. An example is included to show the use of the method and for comparison with the standard merging technique. This paper only considers the application to asynchronous machines.
An ultrasonic position sensor for automatic control
- Author(s): W.P. Willis and L. Kay
- Source: Radio and Electronic Engineer, Volume 40, Issue 6, p. 305 –307
- DOI: 10.1049/ree.1970.0099
- Type: Article
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p.
305
–307
(3)
An instrument has been designed and experiments carried out to determine the resolution which may be possible using airborne ultrasonics as a sensing medium. The experiments were conducted using one transmitter and two receivers from which it is shown that a resolution of the order of a 3 mm cube is practicable using a single wide angle radiator and a surrounding cluster of 3 wide angle receptors.
A computer controlled tester for logic networks and a method for synthesizing test patterns
- Author(s): K.J. Crook and J. Blythin
- Source: Radio and Electronic Engineer, Volume 40, Issue 6, p. 309 –315
- DOI: 10.1049/ree.1970.0100
- Type: Article
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p.
309
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(7)
This paper describes a total test system for logic networks as manufactured for digital electronic equipment. The system provides a means of physically testing the manufactured item together with a method for preparing test data automatically using a computer. The method uses sensitive path techniques with forward and reverse simulation of a software model of the network which is held in the computer store. The justification for automatic test synthesis lies in the large number of network types which are designed.
The visualization of ultrasound in solids
- Author(s): J.H. Gunton and D.M. Marsh
- Source: Radio and Electronic Engineer, Volume 40, Issue 6, p. 316 –320
- DOI: 10.1049/ree.1970.0101
- Type: Article
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p.
316
–320
(5)
In order to improve ultrasonic testing methods, a highly sensitive Schlieren apparatus has been built to visualize the propagation of ultrasound in solids. The design of the apparatus is described and some of the initial results are shown.
A cellular 8421 B.C.D. multiplier
- Author(s): G. White
- Source: Radio and Electronic Engineer, Volume 40, Issue 6, p. 321 –322
- DOI: 10.1049/ree.1970.0102
- Type: Article
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p.
321
–322
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An iterative array of macro-cells is proposed to multiply together two N digit decimal numbers with a propagation delay of (2N − 1) macrocell delays. The array will also add two decimal numbers to the product without adding to the complexity.
Measurements on a solid-state noise source
- Author(s): J.A. Roberts and W. Gosling
- Source: Radio and Electronic Engineer, Volume 40, Issue 6, p. 323 –324
- DOI: 10.1049/ree.1970.0103
- Type: Article
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p.
323
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(2)
Some planar silicon junctions with a breakdown voltage of 5.6V produce noise with good waveform up to lGHz. Flicker noise is absent.
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