Multimeter with filtered measurement mode
AssigneeFluke Corporation
InventorCharles Newcombe
Life of this patent
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Abstract
A multimeter with a filtered measurement mode. By pressing a single button or key, a low-pass filter is switched into the signal path to filter voltage spikes, noise, and switching transients from pulse-width modulated pulses, or lower frequency sinusoidal signals with higher frequency components, and at the same time an on-screen icon indicates to a user that the filtered mode has been selected. The user can switch back and forth between filtered and unfiltered modes. The filtered measurement mode is useful in measuring the outputs of modern adjustable-speed motor drives, uninterruptible power sources, and switch power supplies.
Claims8
A multimeter, comprising:
- an input circuit for receiving voltage signals;
- a measurement circuit coupled to the output of said input circuit for processing said voltage signals to provide measurement results;
- a display device having a viewing screen for displaying said measurement results;
- and
- a low-pass filter selectably disposed between said input circuit and said measurement circuit.
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Dependencies are inferred from the claim text.