Arrangement for measuring the root mean square of a power frequency voltage across a large dynamic range, especially for measuring electrical output

US6794881B1 · kind B1 · utility

Assignee

• Rohde & Schwarz GmbH & Co. KG · DE

Inventors

• Thomas Reichel · Heroldsbach, DE
• Toralf Bratfisch · Putzbrunn, DE

Key dates

• Filing date: Jul 30, 2002
• Grant date: Sep 21, 2004
• Expiry date: Oct 12, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03F2200/261
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The root mean square of a power frequency voltage is measured across a large dynamic range, for example in order to measure electrical output, by converting the voltage to be measured into two or more partial voltage proportional thereto and measuring each partial voltage using an individual diode rectifier. The output voltages of said diode rectifiers are then converted into a digital value and each of these digital values is weighted with weighting factors, the ratio of said weighting factors being derived from the control factor of at least one of the diode rectifiers. These weighted digital values are then scaled to a common quantification unit and added to achieved the actual digital measurement value.