Precision measuring amplifier

Details Precision measuring amplifier Precision measuring amplifier

1977-12-28

1979-03-20

Heyman, John S.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

328159, 324132, G01R 1510, G01R 1902, G01R 1702

Patent

active

041456610

ABSTRACT:
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.

REFERENCES:
patent: 3500198 (1970-03-01), Kaiser et al.
patent: 3971984 (1976-07-01), Bench
patent: 4000463 (1976-12-01), Katzmann et al.
patent: 4091329 (1978-05-01), Fletcher et al.
patent: 4113997 (1978-09-01), Horna

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