Delta-T measurement circuit

Details Delta-T measurement circuit Delta-T measurement circuit

1997-05-12

1998-08-04

Roskoski, Bernard

Horology: time measuring systems or devices

Time interval

Electrical or electromechanical

G04F 800

Patent

active

057904804

ABSTRACT:
A method and apparatus for measuring very short time periods, or differences between two events, such as the delta-T between a trigger point on a waveform and a sampling clock edge of a digital oscilloscope. The delta-T measurements are made using the time-to-voltage transformation of an integrator. The output sweep ramp of the integrator is normalized to a fixed differential time and differential amplitude by correction current provided by a reference circuit that has a reference integrator substantially identical to the delta-T integrator. The reference integrator is operated at the same timing as the delta-T integrator, and an error correction loop furnishes the right amount of current to both integrators to normalize the peak voltage of both to a predetermined reference voltage.

REFERENCES:
patent: 3790890 (1974-02-01), Doittau et al.
patent: 4251754 (1981-02-01), Navarro et al.
patent: 4301360 (1981-11-01), Blair
patent: 4504155 (1985-03-01), Ruggieri
patent: 5196741 (1993-03-01), Rustici

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