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US 5,861,740 AGranted
Load loss standard for calibrating power loss measurement systems
AssigneeNational Research Council of Canada
InventorEddy So
Life of this patent
Estimating the term…
Abstract
In a load loss standard for calibrating a power measurement system, a pair of reference voltage signals are generated, one in-phase and the other in quadrature with a test voltage ac source. A transconducting and summing amplifier generates an output current corresponding to the vector sum of these reference signals. By varying the magnitude of each of the reference signals independently of each other it becomes possible to vary the phase of the output current relative to the source, while keeping the magnitude of such current constant.
Claims8
In a load loss standard for calibrating a power measuring system, comprising
- (a) means for connection to a test voltage ac source for generating a pair of reference voltage signals respectively in-phase and in quadrature with respect to said source, and
- (b) transconductance and summing amplifier means for generating an output to current corresponding to the vector sum of said reference signals,
- (c) the improvement comprising means for varying the magnitude of each of said reference voltage signals independently of one another whereby to control the magnitude of said output current and its phase relative to the source independently of each other.
Dependencies are inferred from the claim text.