Wide dynamic range current measuring apparatus

Details Wide dynamic range current measuring apparatus Wide dynamic range current measuring apparatus

G - Physics

01

R

324/59, 324/68,

G01R 19/00 (2006.01) G01R 15/08 (2006.01) G01R 19/257 (2006.01)

Patent

CA 1312652

WE 54,364 ABSTRACT OF THE DISCLOSURE Apparatus for measuring current over a wide range generates an eight bit accurate, 16-bit dynamic range digital signal from a current transformer secondary. Two signals proportional to the rectified secondary current, one generated by a large burden resistor and the other by an amplifier with programmable gain and an overrange indication, are applied through a multiplexer to an eight bit analog to digital converter which has three selectable reference voltages. A microprocessor selects the input signal, converter reference voltage, and one of four levels of amplifier gain which provide the greatest resolution for the magnitude of the current being measured, and provides an appropriate scale factor, from 20 to 28, for the eight bit accurate digital signal generated by the analog to digital converter.

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