Method and apparatus for digitally measuring alternating current

Details Method and apparatus for digitally measuring alternating current Method and apparatus for digitally measuring alternating current

1982-05-07

1986-11-25

Gruber, Felix D.

Boots, shoes, and leggings

324 77A, 361 93, 364483, H02H 308, G06F 15324, G01R 1904

Patent

active

046252835

ABSTRACT:
The method of the present invention encompasses comparing the instantaneous value of a waveform with at least two reference voltages, -R and +R, when crossing of these voltages occurs and processing this data in a data processor (46) to determine parameters of the waveform such as frequency and amplitude and of fundamental and DC offset.
The apparatus of the present invention includes comparators (E.sub.1 and E.sub.2) which senses the voltage crossings and which has outputs (28 and 30) inputted to a latch (36) and to logic circuitry (32). A counter (50) supplies a count to the latch (36) and the output of the latch (36) is coupled to a microprocessor (46). The logic circuitry (32) has an output (34) coupled to the latch and to the microprocessor (46) first for causing, when a crossing occurs, the latch (36) to latch data identifying the particular crossing made and a count of the time it occurred and second to cause the microprocessor (46) to input this latched data and then to reset the logic circuitry.

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