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Chubb J.,Infostatic
Journal of Electrostatics | Year: 2015

The response of field mill type electrostatic fieldmeters to alternating electric fields is limited by the chopping frequency. Measurements reported here show that alternating frequencies at the chopping frequency, and related harmonics, can create confusing low frequency outputs. Hence care is needed for interpreting observations where such alternating electric fields may be present. © 2015 Elsevier B.V..


Chubb J.,Infostatic
Journal of Electrostatics | Year: 2015

There is no one single test that shows the electrostatic suitability of materials for all situations. The paper offers some more philosophic thoughts on the basic approaches that need to be adopted for methods to assess the electrostatic suitability of materials. In essence the recommendation is that test methods should be, or be close to, the relevant practical operation and situation. Alternative, perhaps more convenient measurement methods, need to be shown to match the results achieved in the relevant practical operation and situation. © 2015 Elsevier B.V.


The studies reported show that measurements of atmospheric electric fields by pole mounted electrostatic fieldmeters can match measurements by a horizontal antenna wire. Some differences were experienced early in the tests that cannot yet be explained. The differences are tentatively attributed to tribocharging actions during initial set up of the antenna system and by wind blown airborne particulates at the antenna wire. Pole mounted fieldmeters provide opportunity for long term unattended measurements in quite adverse weather conditions with continuous checking of operational health against debris, spider's webs, etc. © 2014 Elsevier B.V.


Chubb J.,Infostatic | Harbour J.,Hawthorne Technical Design | Pavey I.,Chilworth Technology Ltd.
Journal of Physics: Conference Series | Year: 2011

The paper describes the approach of 'stutter timing' that has been developed to improve the accuracy of measuring charge decay times in the presence of noise in compact and portable charge decay test instrumentation. The approach involves starting and stopping the timing clock as the noisy signal rises above and falls below the target threshold voltage level.


Chubb J.,Infostatic
Journal of Electrostatics | Year: 2014

A method of charge decay testing is proposed in which a localized electric field is applied by a fieldmeter to an area of the material to be tested. The variation of electric field is recorded as charge migrates across the surface. Arrangements are described for this method of testing and studies reported comparing results with corona and tribocharge decay measurements. Interesting differences are shown between the methods of testing. Induction charge decay testing is not proposed as a replacement for corona or tribocharge decay testing. It offers the opportunity for simpler instrumentation and measurement of faster charge decay times.© 2014 Elsevier B.V.

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