RMS measuring apparatus for AC/DC voltages

Details RMS measuring apparatus for AC/DC voltages RMS measuring apparatus for AC/DC voltages

1987-05-29

1988-11-22

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Balancing

324106, 324132, G01R 1706, G01R 1903

Patent

active

047868597

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 lath which controls the chopped DC voltage.

REFERENCES:
patent: 3842349 (1974-10-01), Cox et al.
patent: 3845388 (1974-10-01), Ley et al.
patent: 3911359 (1975-10-01), Metcalf
patent: 4360880 (1982-11-01), Brodie et al.
patent: 4628256 (1986-12-01), Powell
IEEE Trans. on Instrum. & Meas., Gerr et al., "Automating Wide-Band AC/DC Transfer Measurements", vol. IM 25, No. 4, Dec. 1976, pp. 533-537.
IEEE Trans. on Instrum. & Meas., Inglis, "AC-DC Transfer Standards-Present Status and Future Directions", vol. IM 34, No. 2, Jun. 1985, pp. 285-289.

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