Fast Synchronous Ac-Dc-Transfer with Thermal Converters

Author

Mohns ; Kiirten, W.G.

Author_Institution

Ihlenfeld Phys.-Technische Bundesanstalt - PTB, Braunschweig

fYear

2004

fDate

38139

Firstpage

190

Lastpage

191

Abstract

The most accurate measurements of the rms (root mean square) values of ac (alternating current) voltages are performed by means of thermal converters (TC) (Klonz, 2002) and digital sampling procedures (Ihlenfeld, 2001 and Ihlenfeld, et. al., 2003) (at low frequencies) with uncertainties of the order of some fractions of muV/V. The main drawback of using TCs relies on the long measuring times required, of a few minutes in most cases. In the following, a simple method for reducing the measuring time and to substantially speed up ac-dc transfer measurements will be described and documented with results of a comparison measurement

Keywords

AC-AC power convertors; measurement standards; measurement uncertainty; voltage measurement; alternating current voltage; digital sampling; fast synchronous AC-DC transfer; root mean square voltage; thermal converters; Analog-digital conversion; Cutoff frequency; Digital-to-frequency converters; Frequency measurement; Sampling methods; Signal processing; Switches; Time measurement; Velocity measurement; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements Digest, 2004 Conference on

Conference_Location

London

Print_ISBN

0-7803-8494-6

Electronic_ISBN

0-7803-8494-6

Type

conf

DOI

10.1109/CPEM.2004.305525

Filename

4097180