G - Physics – 01 – R
Patent
G - Physics
01
R
324/66
G01R 29/04 (2006.01) G01R 19/02 (2006.01)
Patent
CA 1094159
TITLE PRECISION MEASURING AMPLIFIER INVENTOR George S.K. Wong ABSTRACT OF THE DISCLOSURE The precision measuring amplifier includes one or more amplifiers, a number of fixed attenuators, a RMS detector and a logarithmic converter for converting the output of the RMS detector to a logarithmic value. A number of fixed voltage sources each providing a voltage precisely related to the attenuation of a corresponding attenuator, are selectively coupled to a summing amplifier to which the logarithmic converter output is also connected. The number of attenuators connected either manually or automatically into amplifier apparatus at one time is dependent on the input signal level, and for every attenuator connected into the amplifier apparatus, a voltage source is connected to the summing amplifier to provide an output signal proportional to the logarithm of the RMS value of the input signal.
313462
National Research Council Of Canada
Rymek Edward
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