Digital ac monitor

Details Digital ac monitor Digital ac monitor

1984-10-18

1987-06-09

Chin, Gary

Boots, shoes, and leggings

364481, 324142, G01R 1900, G01R 2100, G06F 1520

Patent

active

046725555

ABSTRACT:
An apparatus and method is provided for monitoring a plurality of analog ac circuits by sampling the voltage and current waveform in each circuit at predetermined intervals, converting the analog current and voltage samples to digital format, storing the digitized current and voltage samples and using the stored digitized current and voltage samples to calculate a variety of electrical parameters; some of which are derived from the stored samples.
The non-derived quantities are repeatedly calculated and stored over many separate cycles then averaged. The derived quantities are then calculated at the end of an averaging period. This produces a more accurate reading, especially when averaging over a period in which the power varies over a wide dynamic range.
Frequency is measured by timing three cycles of the voltage waveform using the upward zero crossover point as a starting point for a digital timer.

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