DOI:10.1049/ree.1971.0131

出版商:IERE    

年代:1971

数据来源: IET

摘要:

A preventive maintenance program for a hybrid computer complex is described which makes operational and static accuracy checks. Interfaces, logic elements and analogue elements are tested by sets of individual routines. Considerable time saving is achieved by automatic testing depending on the complexity of the test. An improvement in m.t.b.f. has been observed.

DOI:10.1049/ree.1971.0132

出版商:IERE    

年代:1971

数据来源: IET

摘要:

A modular, low cost, mass spectrometric data system based on a hybrid analogue-digital preprocessing unit and the British Standard Interface is described. The basic hardware is physically small, has a wide range of capability, and deals directly with the voltage output from electrically recording spectrometers. Mass measurements from single scans at 1:10 000 resolution at 10 s/mass decade show an r.m.s. error of 9 parts in 106, and at 1: 400 resolution and 0.16 s/decade, an r.m.s. error of 0.06 mass units on all peaks ≥ 1/500 full scale. Measured intensity values are accurate to 5% of calculated for peaks > 1%. System and processing considerations, and practical arrangements are detailed.

DOI:10.1049/ree.1971.0133

出版商:IERE    

年代:1971

数据来源: IET

摘要:

Networks with approximately Gaussian insertion loss characteristics for the shaping and standardization of pulses used in B.B.C. television equipment have previously been designed by Dishal's method based on a Taylor series approximant. A proposal by Jones for an improved Gaussian approximant employing Laguerre polynomials suggested that more effective networks might be possible, Computer programs were written for the realization of the Laguerre approximant networks, and a series of networks was constructed and tested. The Laguerre networks were found to be superior both in their improved shaping and in possessing more convenient element values. Design data for both types are provided in tabular form.

DOI:10.1049/ree.1971.0134

出版商:IERE    

年代:1971

数据来源: IET

摘要:

The subject of oral expression of metric dimensions in drawing offices and on the shop floor has been fully discussed during recent months by the Joint Committee on Metrication set up by the Royal Society and the Council of Engineering Institutions. In the Committee's opinion this matter warrants careful consideration by all sectors of industry if confusion is to be avoided from the outset. A consensus of opinion from all levels of industry—shop floor to management—is felt to be important and for this reason the Institution has been asked to give prominence to the following statement.

DOI:10.1049/ree.1971.0135

出版商:IERE    

年代:1971

数据来源: IET

摘要:

A cellular array is proposed which can be controlled to perform the following arithmetic functions; A+BD+C, A−BD−C, or A/B. This results in a saving of hardware over previous arrays, and by having more terms in each function, a reduction in the overall calculation time can be achieved.

DOI:10.1049/ree.1971.0136

出版商:IERE    

年代:1971

数据来源: IET

摘要:

Expressions are derived for the maximum permissible interfering input signal power which may be applied to a square-wave switched resistively terminated ring modulator before the onset of severe cross-modulation distortion in the output spectrum. The effects of source and load mismatch are considered and good agreement demonstrated between theoretical prediction and the measured performance of a typical ring modulator using Schottky barrier diodes.

DOI:10.1049/ree.1971.0137

出版商:IERE    

年代:1971

数据来源: IET

摘要:

This paper describes an investigation into methods of testing diodes to find those with a predictable and stable noise level, and further describes the noise characteristics of some diodes selected by these methods.

DOI:10.1049/ree.1971.0138

出版商:IERE    

年代:1971

数据来源: IET

摘要:

Investigates the feasibility of the laser beam as a trigger for high-voltage gaps. The formative times are studied as a function of the working voltage for different values of pressure, gap spacing and laser power. A low jitter was obtained, of the order of ± 1 ns for a delay of up to 20 ns, making the laser suitable for triggering multiple arc gaps.

DOI:10.1049/ree.1971.0139

出版商:IERE    

年代:1971

数据来源: IET