Method and apparatus for measuring electrical parameters using a

Details Method and apparatus for measuring electrical parameters using a Method and apparatus for measuring electrical parameters using a

1993-07-27

1996-01-16

Voeltz, Emanuel T.

Boots, shoes, and leggings

364572, 36472401, 324142, G01R 2106, G06F 1900

Patent

active

054853931

ABSTRACT:
A digital current meter, usable either alone or in combination with a voltage meter, is disclosed. The current meter includes a current sensor which outputs the time derivative of the current flowing through the load being measured. The differentiated current signal is digitally sampled, usually by a sigma-delta sampler, filtered, and digitally integrated. A feedback path is provided to remove the direct-current (DC) component of the current signal, to keep the integrator from going out of range. A bleeder feedback channel around the digital integrator is provided to keep the digital integrator from permanently latching an impulse. In combination with a voltage meter, a half-sample delay is introduced in the current signal path, to compensate for the lead provided by the combination of the analog differentiator and the digital integrator, and the voltage signal path uses filters with the same characteristics as the current channel, to match the delay in the two channels.

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