Method and apparatus for graphically displaying amplitude and ph

Details Method and apparatus for graphically displaying amplitude and ph Method and apparatus for graphically displaying amplitude and ph

1978-01-10

1979-04-10

Robinson, Thomas A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324121R, H04B 346

Patent

active

041490444

ABSTRACT:
Amplitude and phase jitter can be individually or simultaneously viewed and immediately quantified on an oscilloscope by alternately applying both jitter signals to the vertical (or horizontal) deflection plates at a prescribed chopping frequency and applying the chopping signal to the horizontal (or vertical) deflection plates. The chopping signal frequency should be sufficiently greater than the bandwidth of the jitter signals to permit proper sampling. The resulting display is two spaced vertical (or horizontal) lines, the lengths of which represent instantaneous amplitude and phase jitter, respectively. Another embodiment alternately applies one of the jitter signals to the vertical plates while grounding the horizontal plates and applies the other jitter signal to the horizontal plates while grounding the vertical plates, the alternation being effected at a chopping frequency which is sufficiently high to permit proper sampling of the jitter signals. The resulting display is two perpendicular lines, the lengths of which represent the instantaneous amplitude of the amplitude and phase jitter.

REFERENCES:
patent: 3711773 (1973-01-01), Hekimian et al.
patent: 3814868 (1974-06-01), Bradley
patent: 3906173 (1975-09-01), Bradley
patent: 3927281 (1975-12-01), Bradley
patent: 3985980 (1976-10-01), Bradley
patent: 4041254 (1977-08-01), Bradley et al.

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