Rms measuring apparatus for ac/dc voltages

Details Rms measuring apparatus for ac/dc voltages Rms measuring apparatus for ac/dc voltages

G - Physics

01

R

324/68

G01R 19/03 (2006.01) G01R 19/02 (2006.01)

Patent

CA 1325037

TITLE RMS MEASURING APPARATUS FOR AC/DC VOLTAGES INVENTORS Rejean Arseneau John J. Zelle ABSTRACT A true RMS instrument using a multijunction thermal converter with two beaters automatically determines and displays the RMS value of an unknown voltage using two steps or modes. In an AC mode, the unknown voltage is attenuated and balanced in the thermal converter with a DC voltage. DC voltage is stored in digital form in a first latch. In the DC mode, the unknown attenuated voltage is replaced by a chopped DC voltage which is then balanced with the DC voltage obtained in the AC mode. The unknown voltage is determined by decoding the contents of a second latch which controls the chopped DC voltage.

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