< back to main site


Impedance measurements at frequencies up to 1 MHz.

Awan, S A; Kibble, B P (2001) Impedance measurements at frequencies up to 1 MHz. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Full text not available from this repository.


A four terminal-pair bridge has recently been developed for accurately measuring the frequency dependance of impedance standards up to 1 MHz at the National Physical Laboratory. The results obtained for the apparent impedance of different types of capacitance standards (such as air- and NPO-dielectric) as a function of frequency are discussed. Air-dielectric standards are extensively used in metrology laboratories whereas the NPO-dielectric standards are finding more widespread use because of their relatively small voltage and temperature coefficients and dissipation factor. Their small physical size makes them suitable for high frequency standards having values from 10 pF to 1 µF. The relative frequency dependance of coaxial and surface-mount resistance standards as measured by the four terminal-pair bridge will also be presented. The implications of these measurements for the accurate calibration of LCR meters and network analysers to higher frequencies will be discussed. A brief outline of the progress on extending traceable impedance measurements up to 10 MHz is also presented.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: Electromagnetics
Electromagnetics > RF and Microwave
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2173

Actions (login required)

View Item View Item