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Abstract

A method and apparatus for calibrating a digital electric energy consumption meter of the type which performs voltage and current sampling in timed cycle clusters and then performs algorithmic or Fourier analysis on the sampling to determine the electrical energy being sampled. The meter includes a computer for performing this analysis and this meter computer further includes a microprocessor, appropriate memory for the microprocessor, a clock for timing and initiation of the sampling, a calibration synchronizing signal output for generating a calibration start output signal when the meter begins the sampling, and an input for entering calibration factors into meter memory. The calibration stand electronically calibrates the meter by generating and sending standardized current and voltage, which need not be the same wave forms, to the meter for sampling when the calibration stand receives the calibration start signal from the meter thereby synchronizing the voltage and current source of the calibration stand with the meter sampling. Thereupon the meter calculates and sends back to the calibration stand either computed uncalibrated power or computed algorithmic or Fourier component magnitudes and the calibration stand then computes the relevant calibration factors for the meter being calibrated and sends the calibration factors to the meter for storage in memory to thereby calibrate the meter.

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First Claim