Horology: time measuring systems or devices – Time interval – Electrical or electromechanical
Patent
1990-08-09
1992-06-16
Miska, Vit W.
Horology: time measuring systems or devices
Time interval
Electrical or electromechanical
368115, 368121, 324121R, G04F 800, G04F 1000
Patent
active
051229960
ABSTRACT:
A method and apparatus performs time-interval to voltage conversion immediately and continuously allowing timing variations to be viewed and correlated with other voltage signals displayed on an oscilloscope. A calibration output assists in calibrating the vertical gain and offset of the oscilloscope. An automatic setup software routine finds suitable resolution and offset settings. The method includes the steps of selecting the type of time-interval to be measured, scaling the counting of a clock signal appropriately, offsetting the counting means as desired, counting the number of clock signals that occur during every selected time-interval, limiting the counted results to a preselected range, and converting the counted results to an analog voltage for display by an oscilloscope. And, in a preferred version of the method, when counted results are limited the operator is notified, and there is an additional step of detecting when time-intervals are occurring faster than they can be counted and notifying the operator of that too. A corresponding apparatus for performing the method is disclosed.
REFERENCES:
patent: 4362394 (1982-12-01), Menlove
patent: 4678345 (1987-07-01), Agoston
patent: 4704036 (1987-11-01), Holte et al.
patent: 4855968 (1989-08-01), Shank
patent: 4985844 (1991-01-01), Ioley et al.
"System Timer/Counters", Fluke/Philips 1988 Catalog, advertisement for Analog Recorder Output PM 9695, p. 320.
"TIAs: A New Way to Measure Time", Electronic Engineering Times, Jun. 4, 1990, p. 54.
Tektronix 067-0587-02 Calibration Fixture Signal Standardizer Service Instruction Manual, 1979, pp. 5-9.
Tektronix 067-0587-10 7612D Calibration Fixture Signal Standardizer Service Instruction Manual, 1986, pp. 1-3.
Foley Clark P.
Gauland Michael A.
Sasaki Stanley K.
Griffith Boulden C.
Miska Vit W.
Tektronix Inc.
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