"RIV/00216305:26220/09:PU82514!RIV10-MSM-26220___" . "The wide availability of present impedance analyzers, with frequency ranges from a few Hz to units of GHz, fundamentally simplifies the measurement of electric properties of dielectric materials and makes the time domain measurements seemingly unneeded. Yet, measurements of discharge currents are very convenient, as the measured time dependence of the discharge current can be transformed to the frequency domain by Fourier transformation. This approach yields dielectric spectra at frequencies as low as a few Hz, which are difficult to obtain in the frequency domain directly. However, measurements at very long discharge times and, hence, of very low currents (below 1 pA) are not trivial and are limited by serious experimental obstacles. This paper deals with factors affecting the measurement and transformation accuracy, and presents the procedures aimed to reduce the amount of noise in final dielectric spectra."@en . "4"^^ . . . "325453" . "Measurement of very low currents in electrical insulating materials and noise suppression methodology"@en . . "[E807A8ADC876]" . "M\u011B\u0159en\u00ED velmi n\u00EDzk\u00FDch proud\u016F v elektroizola\u010Dn\u00EDch materi\u00E1lech a metodika potla\u010Dov\u00E1n\u00ED \u0161umu"@cs . . "M\u011B\u0159en\u00ED velmi n\u00EDzk\u00FDch proud\u016F v elektroizola\u010Dn\u00EDch materi\u00E1lech a metodika potla\u010Dov\u00E1n\u00ED \u0161umu" . . . "26220" . "Sou\u010Dasn\u00E1 snadn\u00E1 dostupnost impedan\u010Dn\u00EDch analyz\u00E1tor\u016F r\u016Fzn\u00FDch v\u00FDrobc\u016F s frekven\u010Dn\u00EDmi rozsahy od jednotek Hz do jednotek GHz podstatn\u011B zjednodu\u0161uje m\u011B\u0159en\u00ED klasick\u00FDch dielektrick\u00FDch parametr\u016F a \u010Din\u00ED tak m\u011B\u0159en\u00ED elektroizola\u010Dn\u00EDch materi\u00E1l\u016F v \u010Dasov\u00E9 oblasti - nab\u00EDjec\u00EDch a vyb\u00EDjec\u00EDch proud\u016F, resp. r\u016Fzn\u00FDch index\u016F - zd\u00E1nliv\u011B nadbyte\u010Dn\u00FDm. Z hlediska dielektrick\u00E9 relaxa\u010Dn\u00ED spektroskopie je v\u0161ak m\u011B\u0159en\u00ED vyb\u00EDjec\u00EDch proud\u016F velice u\u017Eite\u010Dnou metodou, pon\u011Bvad\u017E zm\u011B\u0159en\u00FD pr\u016Fb\u011Bh vyb\u00EDjec\u00EDho proudu dielektrika lze pomoc\u00ED Fourierovy transformace p\u0159ev\u00E9st do frekven\u010Dn\u00ED oblasti. T\u00EDmto zp\u016Fsobem lze z\u00EDskat dielektrick\u00E9 spektrum p\u0159i frekvenc\u00EDch do \u0159\u00E1du uHz, kter\u00E9 je jinak obt\u00ED\u017En\u011B experiment\u00E1ln\u011B p\u0159\u00EDstupn\u00E9. Znalost dielektrick\u00E9ho spektra v takto roz\u0161\u00ED\u0159en\u00E9m frekven\u010Dn\u00EDm rozsahu umo\u017En\u00ED z\u00EDskat lep\u0161\u00ED p\u0159edstavu o chov\u00E1n\u00ED zvolen\u00E9ho elektroizola\u010Dn\u00EDho syst\u00E9mu. M\u011B\u0159en\u00ED velmi n\u00EDzk\u00FDch proud\u016F (pod 1 pA) ov\u0161em nen\u00ED zcela trivi\u00E1ln\u00ED a je"@cs . "Liedermann, Karel" . "Z\u00E1pado\u010Desk\u00E1 univerzita v Plzni" . "Srn\u00ED" . . "Measurement of very low currents in electrical insulating materials and noise suppression methodology"@en . . . "Sou\u010Dasn\u00E1 snadn\u00E1 dostupnost impedan\u010Dn\u00EDch analyz\u00E1tor\u016F r\u016Fzn\u00FDch v\u00FDrobc\u016F s frekven\u010Dn\u00EDmi rozsahy od jednotek Hz do jednotek GHz podstatn\u011B zjednodu\u0161uje m\u011B\u0159en\u00ED klasick\u00FDch dielektrick\u00FDch parametr\u016F a \u010Din\u00ED tak m\u011B\u0159en\u00ED elektroizola\u010Dn\u00EDch materi\u00E1l\u016F v \u010Dasov\u00E9 oblasti - nab\u00EDjec\u00EDch a vyb\u00EDjec\u00EDch proud\u016F, resp. r\u016Fzn\u00FDch index\u016F - zd\u00E1nliv\u011B nadbyte\u010Dn\u00FDm. Z hlediska dielektrick\u00E9 relaxa\u010Dn\u00ED spektroskopie je v\u0161ak m\u011B\u0159en\u00ED vyb\u00EDjec\u00EDch proud\u016F velice u\u017Eite\u010Dnou metodou, pon\u011Bvad\u017E zm\u011B\u0159en\u00FD pr\u016Fb\u011Bh vyb\u00EDjec\u00EDho proudu dielektrika lze pomoc\u00ED Fourierovy transformace p\u0159ev\u00E9st do frekven\u010Dn\u00ED oblasti. T\u00EDmto zp\u016Fsobem lze z\u00EDskat dielektrick\u00E9 spektrum p\u0159i frekvenc\u00EDch do \u0159\u00E1du uHz, kter\u00E9 je jinak obt\u00ED\u017En\u011B experiment\u00E1ln\u011B p\u0159\u00EDstupn\u00E9. Znalost dielektrick\u00E9ho spektra v takto roz\u0161\u00ED\u0159en\u00E9m frekven\u010Dn\u00EDm rozsahu umo\u017En\u00ED z\u00EDskat lep\u0161\u00ED p\u0159edstavu o chov\u00E1n\u00ED zvolen\u00E9ho elektroizola\u010Dn\u00EDho syst\u00E9mu. M\u011B\u0159en\u00ED velmi n\u00EDzk\u00FDch proud\u016F (pod 1 pA) ov\u0161em nen\u00ED zcela trivi\u00E1ln\u00ED a je" . "M\u011B\u0159en\u00ED velmi n\u00EDzk\u00FDch proud\u016F v elektroizola\u010Dn\u00EDch materi\u00E1lech a metodika potla\u010Dov\u00E1n\u00ED \u0161umu" . . . . . . "RIV/00216305:26220/09:PU82514" . "M\u011B\u0159en\u00ED velmi n\u00EDzk\u00FDch proud\u016F v elektroizola\u010Dn\u00EDch materi\u00E1lech a metodika potla\u010Dov\u00E1n\u00ED \u0161umu"@cs . "Z(MSM0021630503)" . "2"^^ . "978-80-7043-793-3" . "Diagnostika 09" . "Plze\u0148" . . . . . . "Palai-Dany, Tom\u00E1\u0161" . "Dielectric relaxation spectroscopy, dielectric spectrum, relative permittivity, loss number, loss factor, low level measurement, noise suppresion."@en . "2"^^ . . . "2009-09-09+02:00"^^ .