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Journal cover: Circuit World

Circuit World

ISSN: 0305-6120

Online from: 1974

Subject Area: Electrical & Electronic Engineering

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On Insulation Resistance

Document Information:
Title:On Insulation Resistance
Author(s):B.N. Ellis, (Protonique SA, Romanel-sur-Lausanne, Switzerland)
Citation:B.N. Ellis, (1995) "On Insulation Resistance", Circuit World, Vol. 21 Iss: 2, pp.5 - 18
Article type:General review
DOI:10.1108/eb046297 (Permanent URL)
Publisher:MCB UP Ltd
Abstract:Surface insulation, electrochemical migration and various other insulation resistances are terms which are often glibly used, sometimes even incorrectly. This paper categorises different types of insulation resistance and catalogues about twenty practical applications of insulation resistance measurement, each with its ideal general conditions of measurement (test voltage, bias voltage, bias polarity, test voltage period, test frequency, test duration, temperature, humidity, test pattern type, test pattern dimensions, voltage gradients, tolerances, etc.) This description is independent of any of the nearly forty known, often contradictory, standards, most of which no longer correspond to the practical printed circuit or assembly of today. Also discussed are the different technologies of insulation resistance measurement, starting with the original non-electronic ‘Megger®’ types through to modern laboratory electrometers and, finally, instrumentation specific to the practical measurement of printed circuit insulation resistances, including static and dynamic types. The importance of automatic statistical analyses is emphasised, especially with production testing as well as qualification procedures. This paper is aimed not only at those wishing to learn what modern insulation resistance testing is all about, but also at experienced persons wanting to marshall their thoughts about the fundamental meanings of insulation testing for different applications and specifications.

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