The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1981
Filed:
Aug. 02, 1979
Benjamin T Brodie, Edmonds, WA (US);
Henriecus Koeman, Edmonds, WA (US);
John Fluke Mfg. Co., Inc., Mountlake Terrace, WA (US);
Abstract
A signal whose RMS value is to be accurately determined is first converted into DC form by a relatively inaccurate RMS converter, such as a thermal RMS converter (15). The result is a first converter signal (Y.sub.1), which is stored for recirculation in a suitable device, such as a sample and hold circuit (17). The first converter signal is also doubled (2Y.sub.1) and stored (41). Thereafter the first converter signal stored in the storage device is recirculated to the converter to create a second converter signal (Y.sub.2). Then, the second converter signal is subtracted (43) from the doubled first converter (2Y.sub.1 -Y.sub.2) to produce a highly accurate RMS output signal.